early-access version 1611

externals/SDL/src/render/SDL_d3dmath.c

@@ -0,0 +1,136 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+#if (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED
+#include "SDL_stdinc.h"
+
+#include "SDL_d3dmath.h"
+
+/* Direct3D matrix math functions */
+
+Float4X4 MatrixIdentity()
+{
+    Float4X4 m;
+    SDL_zero(m);
+    m.v._11 = 1.0f;
+    m.v._22 = 1.0f;
+    m.v._33 = 1.0f;
+    m.v._44 = 1.0f;
+    return m;
+}
+
+Float4X4 MatrixMultiply(Float4X4 M1, Float4X4 M2)
+{
+    Float4X4 m;
+    m.v._11 = M1.v._11 * M2.v._11 + M1.v._12 * M2.v._21 + M1.v._13 * M2.v._31 + M1.v._14 * M2.v._41;
+    m.v._12 = M1.v._11 * M2.v._12 + M1.v._12 * M2.v._22 + M1.v._13 * M2.v._32 + M1.v._14 * M2.v._42;
+    m.v._13 = M1.v._11 * M2.v._13 + M1.v._12 * M2.v._23 + M1.v._13 * M2.v._33 + M1.v._14 * M2.v._43;
+    m.v._14 = M1.v._11 * M2.v._14 + M1.v._12 * M2.v._24 + M1.v._13 * M2.v._34 + M1.v._14 * M2.v._44;
+    m.v._21 = M1.v._21 * M2.v._11 + M1.v._22 * M2.v._21 + M1.v._23 * M2.v._31 + M1.v._24 * M2.v._41;
+    m.v._22 = M1.v._21 * M2.v._12 + M1.v._22 * M2.v._22 + M1.v._23 * M2.v._32 + M1.v._24 * M2.v._42;
+    m.v._23 = M1.v._21 * M2.v._13 + M1.v._22 * M2.v._23 + M1.v._23 * M2.v._33 + M1.v._24 * M2.v._43;
+    m.v._24 = M1.v._21 * M2.v._14 + M1.v._22 * M2.v._24 + M1.v._23 * M2.v._34 + M1.v._24 * M2.v._44;
+    m.v._31 = M1.v._31 * M2.v._11 + M1.v._32 * M2.v._21 + M1.v._33 * M2.v._31 + M1.v._34 * M2.v._41;
+    m.v._32 = M1.v._31 * M2.v._12 + M1.v._32 * M2.v._22 + M1.v._33 * M2.v._32 + M1.v._34 * M2.v._42;
+    m.v._33 = M1.v._31 * M2.v._13 + M1.v._32 * M2.v._23 + M1.v._33 * M2.v._33 + M1.v._34 * M2.v._43;
+    m.v._34 = M1.v._31 * M2.v._14 + M1.v._32 * M2.v._24 + M1.v._33 * M2.v._34 + M1.v._34 * M2.v._44;
+    m.v._41 = M1.v._41 * M2.v._11 + M1.v._42 * M2.v._21 + M1.v._43 * M2.v._31 + M1.v._44 * M2.v._41;
+    m.v._42 = M1.v._41 * M2.v._12 + M1.v._42 * M2.v._22 + M1.v._43 * M2.v._32 + M1.v._44 * M2.v._42;
+    m.v._43 = M1.v._41 * M2.v._13 + M1.v._42 * M2.v._23 + M1.v._43 * M2.v._33 + M1.v._44 * M2.v._43;
+    m.v._44 = M1.v._41 * M2.v._14 + M1.v._42 * M2.v._24 + M1.v._43 * M2.v._34 + M1.v._44 * M2.v._44;
+    return m;
+}
+
+Float4X4 MatrixScaling(float x, float y, float z)
+{
+    Float4X4 m;
+    SDL_zero(m);
+    m.v._11 = x;
+    m.v._22 = y;
+    m.v._33 = z;
+    m.v._44 = 1.0f;
+    return m;
+}
+
+Float4X4 MatrixTranslation(float x, float y, float z)
+{
+    Float4X4 m;
+    SDL_zero(m);
+    m.v._11 = 1.0f;
+    m.v._22 = 1.0f;
+    m.v._33 = 1.0f;
+    m.v._44 = 1.0f;
+    m.v._41 = x;
+    m.v._42 = y;
+    m.v._43 = z;
+    return m;
+}
+
+Float4X4 MatrixRotationX(float r)
+{
+    float sinR = SDL_sinf(r);
+    float cosR = SDL_cosf(r);
+    Float4X4 m;
+    SDL_zero(m);
+    m.v._11 = 1.0f;
+    m.v._22 = cosR;
+    m.v._23 = sinR;
+    m.v._32 = -sinR;
+    m.v._33 = cosR;
+    m.v._44 = 1.0f;
+    return m;
+}
+
+Float4X4 MatrixRotationY(float r)
+{
+    float sinR = SDL_sinf(r);
+    float cosR = SDL_cosf(r);
+    Float4X4 m;
+    SDL_zero(m);
+    m.v._11 = cosR;
+    m.v._13 = -sinR;
+    m.v._22 = 1.0f;
+    m.v._31 = sinR;
+    m.v._33 = cosR;
+    m.v._44 = 1.0f;
+    return m;
+}
+
+Float4X4 MatrixRotationZ(float r)
+{
+    float sinR = SDL_sinf(r);
+    float cosR = SDL_cosf(r);
+    Float4X4 m;
+    SDL_zero(m);
+    m.v._11 = cosR;
+    m.v._12 = sinR;
+    m.v._21 = -sinR;
+    m.v._22 = cosR;
+    m.v._33 = 1.0f;
+    m.v._44 = 1.0f;
+    return m;
+
+}
+
+#endif /* (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/SDL_d3dmath.h

@@ -0,0 +1,72 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+#if (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED
+
+/* Direct3D matrix math functions */
+
+typedef struct
+{
+    float x;
+    float y;
+} Float2;
+
+typedef struct
+{
+    float x;
+    float y;
+    float z;
+} Float3;
+
+typedef struct
+{
+    float x;
+    float y;
+    float z;
+    float w;
+} Float4;
+
+typedef struct
+{
+    union {
+        struct {
+            float _11, _12, _13, _14;
+            float _21, _22, _23, _24;
+            float _31, _32, _33, _34;
+            float _41, _42, _43, _44;
+        } v;
+        float m[4][4];
+    };
+} Float4X4;
+
+
+Float4X4 MatrixIdentity();
+Float4X4 MatrixMultiply(Float4X4 M1, Float4X4 M2);
+Float4X4 MatrixScaling(float x, float y, float z);
+Float4X4 MatrixTranslation(float x, float y, float z);
+Float4X4 MatrixRotationX(float r);
+Float4X4 MatrixRotationY(float r);
+Float4X4 MatrixRotationZ(float r);
+
+#endif /* (SDL_VIDEO_RENDER_D3D || SDL_VIDEO_RENDER_D3D11) && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/SDL_sysrender.h

@@ -0,0 +1,256 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+#ifndef SDL_sysrender_h_
+#define SDL_sysrender_h_
+
+#include "SDL_render.h"
+#include "SDL_events.h"
+#include "SDL_mutex.h"
+#include "SDL_yuv_sw_c.h"
+
+/* The SDL 2D rendering system */
+
+typedef struct SDL_RenderDriver SDL_RenderDriver;
+
+/* Define the SDL texture structure */
+struct SDL_Texture
+{
+    const void *magic;
+    Uint32 format;              /**< The pixel format of the texture */
+    int access;                 /**< SDL_TextureAccess */
+    int w;                      /**< The width of the texture */
+    int h;                      /**< The height of the texture */
+    int modMode;                /**< The texture modulation mode */
+    SDL_BlendMode blendMode;    /**< The texture blend mode */
+    SDL_ScaleMode scaleMode;    /**< The texture scale mode */
+    Uint8 r, g, b, a;           /**< Texture modulation values */
+
+    SDL_Renderer *renderer;
+
+    /* Support for formats not supported directly by the renderer */
+    SDL_Texture *native;
+    SDL_SW_YUVTexture *yuv;
+    void *pixels;
+    int pitch;
+    SDL_Rect locked_rect;
+    SDL_Surface *locked_surface;  /**< Locked region exposed as a SDL surface */
+
+    Uint32 last_command_generation; /* last command queue generation this texture was in. */
+
+    void *driverdata;           /**< Driver specific texture representation */
+
+    SDL_Texture *prev;
+    SDL_Texture *next;
+};
+
+typedef enum
+{
+    SDL_RENDERCMD_NO_OP,
+    SDL_RENDERCMD_SETVIEWPORT,
+    SDL_RENDERCMD_SETCLIPRECT,
+    SDL_RENDERCMD_SETDRAWCOLOR,
+    SDL_RENDERCMD_CLEAR,
+    SDL_RENDERCMD_DRAW_POINTS,
+    SDL_RENDERCMD_DRAW_LINES,
+    SDL_RENDERCMD_FILL_RECTS,
+    SDL_RENDERCMD_COPY,
+    SDL_RENDERCMD_COPY_EX
+} SDL_RenderCommandType;
+
+typedef struct SDL_RenderCommand
+{
+    SDL_RenderCommandType command;
+    union {
+        struct {
+            size_t first;
+            SDL_Rect rect;
+        } viewport;
+        struct {
+            SDL_bool enabled;
+            SDL_Rect rect;
+        } cliprect;
+        struct {
+            size_t first;
+            size_t count;
+            Uint8 r, g, b, a;
+            SDL_BlendMode blend;
+            SDL_Texture *texture;
+        } draw;
+        struct {
+            size_t first;
+            Uint8 r, g, b, a;
+        } color;
+    } data;
+    struct SDL_RenderCommand *next;
+} SDL_RenderCommand;
+
+
+/* Define the SDL renderer structure */
+struct SDL_Renderer
+{
+    const void *magic;
+
+    void (*WindowEvent) (SDL_Renderer * renderer, const SDL_WindowEvent *event);
+    int (*GetOutputSize) (SDL_Renderer * renderer, int *w, int *h);
+    SDL_bool (*SupportsBlendMode)(SDL_Renderer * renderer, SDL_BlendMode blendMode);
+    int (*CreateTexture) (SDL_Renderer * renderer, SDL_Texture * texture);
+    int (*QueueSetViewport) (SDL_Renderer * renderer, SDL_RenderCommand *cmd);
+    int (*QueueSetDrawColor) (SDL_Renderer * renderer, SDL_RenderCommand *cmd);
+    int (*QueueDrawPoints) (SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FPoint * points,
+                             int count);
+    int (*QueueDrawLines) (SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FPoint * points,
+                            int count);
+    int (*QueueFillRects) (SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FRect * rects,
+                            int count);
+    int (*QueueCopy) (SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
+                       const SDL_Rect * srcrect, const SDL_FRect * dstrect);
+    int (*QueueCopyEx) (SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
+                        const SDL_Rect * srcquad, const SDL_FRect * dstrect,
+                        const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip);
+    int (*RunCommandQueue) (SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize);
+    int (*UpdateTexture) (SDL_Renderer * renderer, SDL_Texture * texture,
+                          const SDL_Rect * rect, const void *pixels,
+                          int pitch);
+    int (*UpdateTextureYUV) (SDL_Renderer * renderer, SDL_Texture * texture,
+                            const SDL_Rect * rect,
+                            const Uint8 *Yplane, int Ypitch,
+                            const Uint8 *Uplane, int Upitch,
+                            const Uint8 *Vplane, int Vpitch);
+    int (*LockTexture) (SDL_Renderer * renderer, SDL_Texture * texture,
+                        const SDL_Rect * rect, void **pixels, int *pitch);
+    void (*UnlockTexture) (SDL_Renderer * renderer, SDL_Texture * texture);
+    void (*SetTextureScaleMode) (SDL_Renderer * renderer, SDL_Texture * texture, SDL_ScaleMode scaleMode);
+    int (*SetRenderTarget) (SDL_Renderer * renderer, SDL_Texture * texture);
+    int (*RenderReadPixels) (SDL_Renderer * renderer, const SDL_Rect * rect,
+                             Uint32 format, void * pixels, int pitch);
+    void (*RenderPresent) (SDL_Renderer * renderer);
+    void (*DestroyTexture) (SDL_Renderer * renderer, SDL_Texture * texture);
+
+    void (*DestroyRenderer) (SDL_Renderer * renderer);
+
+    int (*GL_BindTexture) (SDL_Renderer * renderer, SDL_Texture *texture, float *texw, float *texh);
+    int (*GL_UnbindTexture) (SDL_Renderer * renderer, SDL_Texture *texture);
+
+    void *(*GetMetalLayer) (SDL_Renderer * renderer);
+    void *(*GetMetalCommandEncoder) (SDL_Renderer * renderer);
+
+    /* The current renderer info */
+    SDL_RendererInfo info;
+
+    /* The window associated with the renderer */
+    SDL_Window *window;
+    SDL_bool hidden;
+
+    /* The logical resolution for rendering */
+    int logical_w;
+    int logical_h;
+    int logical_w_backup;
+    int logical_h_backup;
+
+    /* Whether or not to force the viewport to even integer intervals */
+    SDL_bool integer_scale;
+
+    /* The drawable area within the window */
+    SDL_Rect viewport;
+    SDL_Rect viewport_backup;
+
+    /* The clip rectangle within the window */
+    SDL_Rect clip_rect;
+    SDL_Rect clip_rect_backup;
+
+    /* Wether or not the clipping rectangle is used. */
+    SDL_bool clipping_enabled;
+    SDL_bool clipping_enabled_backup;
+
+    /* The render output coordinate scale */
+    SDL_FPoint scale;
+    SDL_FPoint scale_backup;
+
+    /* The pixel to point coordinate scale */
+    SDL_FPoint dpi_scale;
+
+    /* The list of textures */
+    SDL_Texture *textures;
+    SDL_Texture *target;
+    SDL_mutex *target_mutex;
+
+    Uint8 r, g, b, a;                   /**< Color for drawing operations values */
+    SDL_BlendMode blendMode;            /**< The drawing blend mode */
+
+    SDL_bool always_batch;
+    SDL_bool batching;
+    SDL_RenderCommand *render_commands;
+    SDL_RenderCommand *render_commands_tail;
+    SDL_RenderCommand *render_commands_pool;
+    Uint32 render_command_generation;
+    Uint32 last_queued_color;
+    SDL_Rect last_queued_viewport;
+    SDL_Rect last_queued_cliprect;
+    SDL_bool last_queued_cliprect_enabled;
+    SDL_bool color_queued;
+    SDL_bool viewport_queued;
+    SDL_bool cliprect_queued;
+
+    void *vertex_data;
+    size_t vertex_data_used;
+    size_t vertex_data_allocation;
+
+    void *driverdata;
+};
+
+/* Define the SDL render driver structure */
+struct SDL_RenderDriver
+{
+    SDL_Renderer *(*CreateRenderer) (SDL_Window * window, Uint32 flags);
+
+    /* Info about the renderer capabilities */
+    SDL_RendererInfo info;
+};
+
+/* Not all of these are available in a given build. Use #ifdefs, etc. */
+extern SDL_RenderDriver D3D_RenderDriver;
+extern SDL_RenderDriver D3D11_RenderDriver;
+extern SDL_RenderDriver GL_RenderDriver;
+extern SDL_RenderDriver GLES2_RenderDriver;
+extern SDL_RenderDriver GLES_RenderDriver;
+extern SDL_RenderDriver DirectFB_RenderDriver;
+extern SDL_RenderDriver METAL_RenderDriver;
+extern SDL_RenderDriver PSP_RenderDriver;
+extern SDL_RenderDriver SW_RenderDriver;
+
+/* Blend mode functions */
+extern SDL_BlendFactor SDL_GetBlendModeSrcColorFactor(SDL_BlendMode blendMode);
+extern SDL_BlendFactor SDL_GetBlendModeDstColorFactor(SDL_BlendMode blendMode);
+extern SDL_BlendOperation SDL_GetBlendModeColorOperation(SDL_BlendMode blendMode);
+extern SDL_BlendFactor SDL_GetBlendModeSrcAlphaFactor(SDL_BlendMode blendMode);
+extern SDL_BlendFactor SDL_GetBlendModeDstAlphaFactor(SDL_BlendMode blendMode);
+extern SDL_BlendOperation SDL_GetBlendModeAlphaOperation(SDL_BlendMode blendMode);
+
+/* drivers call this during their Queue*() methods to make space in a array that are used
+   for a vertex buffer during RunCommandQueue(). Pointers returned here are only valid until
+   the next call, because it might be in an array that gets realloc()'d. */
+extern void *SDL_AllocateRenderVertices(SDL_Renderer *renderer, const size_t numbytes, const size_t alignment, size_t *offset);
+
+#endif /* SDL_sysrender_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/SDL_yuv_sw.c

@@ -0,0 +1,418 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+/* This is the software implementation of the YUV texture support */
+
+#if SDL_HAVE_YUV
+
+#include "SDL_assert.h"
+
+#include "SDL_yuv_sw_c.h"
+
+
+SDL_SW_YUVTexture *
+SDL_SW_CreateYUVTexture(Uint32 format, int w, int h)
+{
+    SDL_SW_YUVTexture *swdata;
+
+    switch (format) {
+    case SDL_PIXELFORMAT_YV12:
+    case SDL_PIXELFORMAT_IYUV:
+    case SDL_PIXELFORMAT_YUY2:
+    case SDL_PIXELFORMAT_UYVY:
+    case SDL_PIXELFORMAT_YVYU:
+    case SDL_PIXELFORMAT_NV12:
+    case SDL_PIXELFORMAT_NV21:
+        break;
+    default:
+        SDL_SetError("Unsupported YUV format");
+        return NULL;
+    }
+
+    swdata = (SDL_SW_YUVTexture *) SDL_calloc(1, sizeof(*swdata));
+    if (!swdata) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    swdata->format = format;
+    swdata->target_format = SDL_PIXELFORMAT_UNKNOWN;
+    swdata->w = w;
+    swdata->h = h;
+    {
+        const int sz_plane         = w * h;
+        const int sz_plane_chroma  = ((w + 1) / 2) * ((h + 1) / 2);
+        const int sz_plane_packed  = ((w + 1) / 2) * h;
+        int dst_size = 0;     
+        switch(format) 
+        {
+            case SDL_PIXELFORMAT_YV12: /**< Planar mode: Y + V + U  (3 planes) */
+            case SDL_PIXELFORMAT_IYUV: /**< Planar mode: Y + U + V  (3 planes) */
+                dst_size = sz_plane + sz_plane_chroma + sz_plane_chroma;
+                break;
+
+            case SDL_PIXELFORMAT_YUY2: /**< Packed mode: Y0+U0+Y1+V0 (1 plane) */
+            case SDL_PIXELFORMAT_UYVY: /**< Packed mode: U0+Y0+V0+Y1 (1 plane) */
+            case SDL_PIXELFORMAT_YVYU: /**< Packed mode: Y0+V0+Y1+U0 (1 plane) */
+                dst_size = 4 * sz_plane_packed;
+                break;
+
+            case SDL_PIXELFORMAT_NV12: /**< Planar mode: Y + U/V interleaved  (2 planes) */
+            case SDL_PIXELFORMAT_NV21: /**< Planar mode: Y + V/U interleaved  (2 planes) */
+                dst_size = sz_plane + sz_plane_chroma + sz_plane_chroma;
+                break;
+
+            default:
+                SDL_assert(0 && "We should never get here (caught above)");
+                break;
+        }
+        swdata->pixels = (Uint8 *) SDL_malloc(dst_size);
+        if (!swdata->pixels) {
+            SDL_SW_DestroyYUVTexture(swdata);
+            SDL_OutOfMemory();
+            return NULL;
+        }
+    }
+
+    /* Find the pitch and offset values for the texture */
+    switch (format) {
+    case SDL_PIXELFORMAT_YV12:
+    case SDL_PIXELFORMAT_IYUV:
+        swdata->pitches[0] = w;
+        swdata->pitches[1] = (swdata->pitches[0] + 1) / 2;
+        swdata->pitches[2] = (swdata->pitches[0] + 1) / 2;
+        swdata->planes[0] = swdata->pixels;
+        swdata->planes[1] = swdata->planes[0] + swdata->pitches[0] * h;
+        swdata->planes[2] = swdata->planes[1] + swdata->pitches[1] * ((h + 1) / 2);
+        break;
+    case SDL_PIXELFORMAT_YUY2:
+    case SDL_PIXELFORMAT_UYVY:
+    case SDL_PIXELFORMAT_YVYU:
+        swdata->pitches[0] = ((w + 1) / 2) * 4;
+        swdata->planes[0] = swdata->pixels;
+        break;
+
+    case SDL_PIXELFORMAT_NV12:
+    case SDL_PIXELFORMAT_NV21:
+        swdata->pitches[0] = w;
+        swdata->pitches[1] = 2 * ((swdata->pitches[0] + 1) / 2);
+        swdata->planes[0] = swdata->pixels;
+        swdata->planes[1] = swdata->planes[0] + swdata->pitches[0] * h;
+        break;
+
+    default:
+        SDL_assert(0 && "We should never get here (caught above)");
+        break;
+    }
+
+    /* We're all done.. */
+    return (swdata);
+}
+
+int
+SDL_SW_QueryYUVTexturePixels(SDL_SW_YUVTexture * swdata, void **pixels,
+                             int *pitch)
+{
+    *pixels = swdata->planes[0];
+    *pitch = swdata->pitches[0];
+    return 0;
+}
+
+int
+SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                        const void *pixels, int pitch)
+{
+    switch (swdata->format) {
+    case SDL_PIXELFORMAT_YV12:
+    case SDL_PIXELFORMAT_IYUV:
+        if (rect->x == 0 && rect->y == 0 &&
+            rect->w == swdata->w && rect->h == swdata->h) {
+                SDL_memcpy(swdata->pixels, pixels,
+                           (swdata->h * swdata->w) + 2* ((swdata->h + 1) /2) * ((swdata->w + 1) / 2));
+        } else {
+            Uint8 *src, *dst;
+            int row;
+            size_t length;
+
+            /* Copy the Y plane */
+            src = (Uint8 *) pixels;
+            dst = swdata->pixels + rect->y * swdata->w + rect->x;
+            length = rect->w;
+            for (row = 0; row < rect->h; ++row) {
+                SDL_memcpy(dst, src, length);
+                src += pitch;
+                dst += swdata->w;
+            }
+            
+            /* Copy the next plane */
+            src = (Uint8 *) pixels + rect->h * pitch;
+            dst = swdata->pixels + swdata->h * swdata->w;
+            dst += rect->y/2 * ((swdata->w + 1) / 2) + rect->x/2;
+            length = (rect->w + 1) / 2;
+            for (row = 0; row < (rect->h + 1)/2; ++row) {
+                SDL_memcpy(dst, src, length);
+                src += (pitch + 1)/2;
+                dst += (swdata->w + 1)/2;
+            }
+
+            /* Copy the next plane */
+            src = (Uint8 *) pixels + rect->h * pitch + ((rect->h + 1) / 2) * ((pitch + 1) / 2);
+            dst = swdata->pixels + swdata->h * swdata->w +
+                  ((swdata->h + 1)/2) * ((swdata->w+1) / 2);
+            dst += rect->y/2 * ((swdata->w + 1)/2) + rect->x/2;
+            length = (rect->w + 1) / 2;
+            for (row = 0; row < (rect->h + 1)/2; ++row) {
+                SDL_memcpy(dst, src, length);
+                src += (pitch + 1)/2;
+                dst += (swdata->w + 1)/2;
+            }
+        }
+        break;
+    case SDL_PIXELFORMAT_YUY2:
+    case SDL_PIXELFORMAT_UYVY:
+    case SDL_PIXELFORMAT_YVYU:
+        {
+            Uint8 *src, *dst;
+            int row;
+            size_t length;
+
+            src = (Uint8 *) pixels;
+            dst =
+                swdata->planes[0] + rect->y * swdata->pitches[0] +
+                rect->x * 2;
+            length = 4 * ((rect->w + 1) / 2);
+            for (row = 0; row < rect->h; ++row) {
+                SDL_memcpy(dst, src, length);
+                src += pitch;
+                dst += swdata->pitches[0];
+            }
+        }
+        break;
+    case SDL_PIXELFORMAT_NV12:
+    case SDL_PIXELFORMAT_NV21:
+        {
+            if (rect->x == 0 && rect->y == 0 && rect->w == swdata->w && rect->h == swdata->h) {
+                SDL_memcpy(swdata->pixels, pixels,
+                        (swdata->h * swdata->w) + 2* ((swdata->h + 1) /2) * ((swdata->w + 1) / 2));
+            } else {
+
+                Uint8 *src, *dst;
+                int row;
+                size_t length;
+
+                /* Copy the Y plane */
+                src = (Uint8 *) pixels;
+                dst = swdata->pixels + rect->y * swdata->w + rect->x;
+                length = rect->w;
+                for (row = 0; row < rect->h; ++row) {
+                    SDL_memcpy(dst, src, length);
+                    src += pitch;
+                    dst += swdata->w;
+                }
+                
+                /* Copy the next plane */
+                src = (Uint8 *) pixels + rect->h * pitch;
+                dst = swdata->pixels + swdata->h * swdata->w;
+                dst += 2 * ((rect->y + 1)/2) * ((swdata->w + 1) / 2) + 2 * (rect->x/2);
+                length = 2 * ((rect->w + 1) / 2);
+                for (row = 0; row < (rect->h + 1)/2; ++row) {
+                    SDL_memcpy(dst, src, length);
+                    src += 2 * ((pitch + 1)/2);
+                    dst += 2 * ((swdata->w + 1)/2);
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+int
+SDL_SW_UpdateYUVTexturePlanar(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                              const Uint8 *Yplane, int Ypitch,
+                              const Uint8 *Uplane, int Upitch,
+                              const Uint8 *Vplane, int Vpitch)
+{
+    const Uint8 *src;
+    Uint8 *dst;
+    int row;
+    size_t length;
+
+    /* Copy the Y plane */
+    src = Yplane;
+    dst = swdata->pixels + rect->y * swdata->w + rect->x;
+    length = rect->w;
+    for (row = 0; row < rect->h; ++row) {
+        SDL_memcpy(dst, src, length);
+        src += Ypitch;
+        dst += swdata->w;
+    }
+
+    /* Copy the U plane */
+    src = Uplane;
+    if (swdata->format == SDL_PIXELFORMAT_IYUV) {
+        dst = swdata->pixels + swdata->h * swdata->w;
+    } else {
+        dst = swdata->pixels + swdata->h * swdata->w +
+              ((swdata->h + 1) / 2) * ((swdata->w + 1) / 2);
+    }
+    dst += rect->y/2 * ((swdata->w + 1)/2) + rect->x/2;
+    length = (rect->w + 1) / 2;
+    for (row = 0; row < (rect->h + 1)/2; ++row) {
+        SDL_memcpy(dst, src, length);
+        src += Upitch;
+        dst += (swdata->w + 1)/2;
+    }
+
+    /* Copy the V plane */
+    src = Vplane;
+    if (swdata->format == SDL_PIXELFORMAT_YV12) {
+        dst = swdata->pixels + swdata->h * swdata->w;
+    } else {
+        dst = swdata->pixels + swdata->h * swdata->w +
+              ((swdata->h + 1) / 2) * ((swdata->w + 1) / 2);
+    }
+    dst += rect->y/2 * ((swdata->w + 1)/2) + rect->x/2;
+    length = (rect->w + 1) / 2;
+    for (row = 0; row < (rect->h + 1)/2; ++row) {
+        SDL_memcpy(dst, src, length);
+        src += Vpitch;
+        dst += (swdata->w + 1)/2;
+    }
+    return 0;
+}
+
+int
+SDL_SW_LockYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                      void **pixels, int *pitch)
+{
+    switch (swdata->format) {
+    case SDL_PIXELFORMAT_YV12:
+    case SDL_PIXELFORMAT_IYUV:
+    case SDL_PIXELFORMAT_NV12:
+    case SDL_PIXELFORMAT_NV21:
+        if (rect
+            && (rect->x != 0 || rect->y != 0 || rect->w != swdata->w
+                || rect->h != swdata->h)) {
+            return SDL_SetError
+                ("YV12, IYUV, NV12, NV21 textures only support full surface locks");
+        }
+        break;
+    }
+
+    if (rect) {
+        *pixels = swdata->planes[0] + rect->y * swdata->pitches[0] + rect->x * 2;
+    } else {
+        *pixels = swdata->planes[0];
+    }
+    *pitch = swdata->pitches[0];
+    return 0;
+}
+
+void
+SDL_SW_UnlockYUVTexture(SDL_SW_YUVTexture * swdata)
+{
+}
+
+int
+SDL_SW_CopyYUVToRGB(SDL_SW_YUVTexture * swdata, const SDL_Rect * srcrect,
+                    Uint32 target_format, int w, int h, void *pixels,
+                    int pitch)
+{
+    int stretch;
+
+    /* Make sure we're set up to display in the desired format */
+    if (target_format != swdata->target_format && swdata->display) {
+        SDL_FreeSurface(swdata->display);
+        swdata->display = NULL;
+    }
+
+    stretch = 0;
+    if (srcrect->x || srcrect->y || srcrect->w < swdata->w || srcrect->h < swdata->h) {
+        /* The source rectangle has been clipped.
+           Using a scratch surface is easier than adding clipped
+           source support to all the blitters, plus that would
+           slow them down in the general unclipped case.
+         */
+        stretch = 1;
+    } else if ((srcrect->w != w) || (srcrect->h != h)) {
+        stretch = 1;
+    }
+    if (stretch) {
+        int bpp;
+        Uint32 Rmask, Gmask, Bmask, Amask;
+
+        if (swdata->display) {
+            swdata->display->w = w;
+            swdata->display->h = h;
+            swdata->display->pixels = pixels;
+            swdata->display->pitch = pitch;
+        } else {
+            /* This must have succeeded in SDL_SW_SetupYUVDisplay() earlier */
+            SDL_PixelFormatEnumToMasks(target_format, &bpp, &Rmask, &Gmask,
+                                       &Bmask, &Amask);
+            swdata->display =
+                SDL_CreateRGBSurfaceFrom(pixels, w, h, bpp, pitch, Rmask,
+                                         Gmask, Bmask, Amask);
+            if (!swdata->display) {
+                return (-1);
+            }
+        }
+        if (!swdata->stretch) {
+            /* This must have succeeded in SDL_SW_SetupYUVDisplay() earlier */
+            SDL_PixelFormatEnumToMasks(target_format, &bpp, &Rmask, &Gmask,
+                                       &Bmask, &Amask);
+            swdata->stretch =
+                SDL_CreateRGBSurface(0, swdata->w, swdata->h, bpp, Rmask,
+                                     Gmask, Bmask, Amask);
+            if (!swdata->stretch) {
+                return (-1);
+            }
+        }
+        pixels = swdata->stretch->pixels;
+        pitch = swdata->stretch->pitch;
+    }
+    if (SDL_ConvertPixels(swdata->w, swdata->h, swdata->format,
+                          swdata->planes[0], swdata->pitches[0], 
+                          target_format, pixels, pitch) < 0) {
+        return -1;
+    }
+    if (stretch) {
+        SDL_Rect rect = *srcrect;
+        SDL_SoftStretch(swdata->stretch, &rect, swdata->display, NULL);
+    }
+    return 0;
+}
+
+void
+SDL_SW_DestroyYUVTexture(SDL_SW_YUVTexture * swdata)
+{
+    if (swdata) {
+        SDL_free(swdata->pixels);
+        SDL_FreeSurface(swdata->stretch);
+        SDL_FreeSurface(swdata->display);
+        SDL_free(swdata);
+    }
+}
+
+#endif /* SDL_HAVE_YUV */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/SDL_yuv_sw_c.h

@@ -0,0 +1,73 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_yuv_sw_c_h_
+#define SDL_yuv_sw_c_h_
+
+#include "../SDL_internal.h"
+
+#include "SDL_video.h"
+
+/* This is the software implementation of the YUV texture support */
+
+struct SDL_SW_YUVTexture
+{
+    Uint32 format;
+    Uint32 target_format;
+    int w, h;
+    Uint8 *pixels;
+
+    /* These are just so we don't have to allocate them separately */
+    Uint16 pitches[3];
+    Uint8 *planes[3];
+
+    /* This is a temporary surface in case we have to stretch copy */
+    SDL_Surface *stretch;
+    SDL_Surface *display;
+};
+
+typedef struct SDL_SW_YUVTexture SDL_SW_YUVTexture;
+
+SDL_SW_YUVTexture *SDL_SW_CreateYUVTexture(Uint32 format, int w, int h);
+int SDL_SW_QueryYUVTexturePixels(SDL_SW_YUVTexture * swdata, void **pixels,
+                                 int *pitch);
+int SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                            const void *pixels, int pitch);
+int SDL_SW_UpdateYUVTexturePlanar(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                                  const Uint8 *Yplane, int Ypitch,
+                                  const Uint8 *Uplane, int Upitch,
+                                  const Uint8 *Vplane, int Vpitch);
+int SDL_SW_LockYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                          void **pixels, int *pitch);
+void SDL_SW_UnlockYUVTexture(SDL_SW_YUVTexture * swdata);
+int SDL_SW_CopyYUVToRGB(SDL_SW_YUVTexture * swdata, const SDL_Rect * srcrect,
+                        Uint32 target_format, int w, int h, void *pixels,
+                        int pitch);
+void SDL_SW_DestroyYUVTexture(SDL_SW_YUVTexture * swdata);
+
+/* FIXME: This breaks on various versions of GCC and should be rewritten using intrinsics */
+#if 0 /* (__GNUC__ > 2) && defined(__i386__) && __OPTIMIZE__ && SDL_ASSEMBLY_ROUTINES && !defined(__clang__) */
+#define USE_MMX_ASSEMBLY 1
+#endif
+
+#endif /* SDL_yuv_sw_c_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/direct3d/SDL_shaders_d3d.c

@@ -0,0 +1,274 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#include "SDL_render.h"
+#include "SDL_system.h"
+
+#if SDL_VIDEO_RENDER_D3D && !SDL_RENDER_DISABLED
+
+#include "../../core/windows/SDL_windows.h"
+
+#include <d3d9.h>
+
+#include "SDL_shaders_d3d.h"
+
+/* The shaders here were compiled with:
+
+       fxc /T ps_2_0 /Fo"<OUTPUT FILE>" "<INPUT FILE>"
+
+   Shader object code was converted to a list of DWORDs via the following
+   *nix style command (available separately from Windows + MSVC):
+
+     hexdump -v -e '6/4 "0x%08.8x, " "\n"' <FILE>
+*/
+
+/* --- D3D9_PixelShader_YUV_JPEG.hlsl ---
+    Texture2D theTextureY : register(t0);
+    Texture2D theTextureU : register(t1);
+    Texture2D theTextureV : register(t2);
+    SamplerState theSampler = sampler_state
+    {
+        addressU = Clamp;
+        addressV = Clamp;
+        mipfilter = NONE;
+        minfilter = LINEAR;
+        magfilter = LINEAR;
+    };
+
+    struct PixelShaderInput
+    {
+        float4 pos : SV_POSITION;
+        float2 tex : TEXCOORD0;
+        float4 color : COLOR0;
+    };
+
+    float4 main(PixelShaderInput input) : SV_TARGET
+    {
+        const float3 offset = {0.0, -0.501960814, -0.501960814};
+        const float3 Rcoeff = {1.0000,  0.0000,  1.4020};
+        const float3 Gcoeff = {1.0000, -0.3441, -0.7141};
+        const float3 Bcoeff = {1.0000,  1.7720,  0.0000};
+
+        float4 Output;
+
+        float3 yuv;
+        yuv.x = theTextureY.Sample(theSampler, input.tex).r;
+        yuv.y = theTextureU.Sample(theSampler, input.tex).r;
+        yuv.z = theTextureV.Sample(theSampler, input.tex).r;
+
+        yuv += offset;
+        Output.r = dot(yuv, Rcoeff);
+        Output.g = dot(yuv, Gcoeff);
+        Output.b = dot(yuv, Bcoeff);
+        Output.a = 1.0f;
+
+        return Output * input.color;
+    }
+*/
+static const DWORD D3D9_PixelShader_YUV_JPEG[] = {
+    0xffff0200, 0x0044fffe, 0x42415443, 0x0000001c, 0x000000d7, 0xffff0200,
+    0x00000003, 0x0000001c, 0x00000100, 0x000000d0, 0x00000058, 0x00010003,
+    0x00000001, 0x00000070, 0x00000000, 0x00000080, 0x00020003, 0x00000001,
+    0x00000098, 0x00000000, 0x000000a8, 0x00000003, 0x00000001, 0x000000c0,
+    0x00000000, 0x53656874, 0x6c706d61, 0x742b7265, 0x65546568, 0x72757478,
+    0xab005565, 0x00070004, 0x00040001, 0x00000001, 0x00000000, 0x53656874,
+    0x6c706d61, 0x742b7265, 0x65546568, 0x72757478, 0xab005665, 0x00070004,
+    0x00040001, 0x00000001, 0x00000000, 0x53656874, 0x6c706d61, 0x742b7265,
+    0x65546568, 0x72757478, 0xab005965, 0x00070004, 0x00040001, 0x00000001,
+    0x00000000, 0x325f7370, 0x4d00305f, 0x6f726369, 0x74666f73, 0x29522820,
+    0x534c4820, 0x6853204c, 0x72656461, 0x6d6f4320, 0x656c6970, 0x2e362072,
+    0x36392e33, 0x312e3030, 0x34383336, 0xababab00, 0x05000051, 0xa00f0000,
+    0x00000000, 0xbf008081, 0xbf008081, 0x3f800000, 0x05000051, 0xa00f0001,
+    0x3f800000, 0x00000000, 0x3fb374bc, 0x00000000, 0x05000051, 0xa00f0002,
+    0x3f800000, 0xbeb02de0, 0xbf36cf42, 0x00000000, 0x05000051, 0xa00f0003,
+    0x3f800000, 0x3fe2d0e5, 0x00000000, 0x00000000, 0x0200001f, 0x80000000,
+    0xb0030000, 0x0200001f, 0x80000000, 0x900f0000, 0x0200001f, 0x90000000,
+    0xa00f0800, 0x0200001f, 0x90000000, 0xa00f0801, 0x0200001f, 0x90000000,
+    0xa00f0802, 0x03000042, 0x800f0000, 0xb0e40000, 0xa0e40800, 0x03000042,
+    0x800f0001, 0xb0e40000, 0xa0e40801, 0x03000042, 0x800f0002, 0xb0e40000,
+    0xa0e40802, 0x02000001, 0x80020000, 0x80000001, 0x02000001, 0x80040000,
+    0x80000002, 0x03000002, 0x80070000, 0x80e40000, 0xa0e40000, 0x03000008,
+    0x80010001, 0x80e40000, 0xa0e40001, 0x03000008, 0x80020001, 0x80e40000,
+    0xa0e40002, 0x0400005a, 0x80040001, 0x80e40000, 0xa0e40003, 0xa0aa0003,
+    0x02000001, 0x80080001, 0xa0ff0000, 0x03000005, 0x800f0000, 0x80e40001,
+    0x90e40000, 0x02000001, 0x800f0800, 0x80e40000, 0x0000ffff
+};
+
+/* --- D3D9_PixelShader_YUV_BT601.hlsl ---
+    Texture2D theTextureY : register(t0);
+    Texture2D theTextureU : register(t1);
+    Texture2D theTextureV : register(t2);
+    SamplerState theSampler = sampler_state
+    {
+        addressU = Clamp;
+        addressV = Clamp;
+        mipfilter = NONE;
+        minfilter = LINEAR;
+        magfilter = LINEAR;
+    };
+
+    struct PixelShaderInput
+    {
+        float4 pos : SV_POSITION;
+        float2 tex : TEXCOORD0;
+        float4 color : COLOR0;
+    };
+
+    float4 main(PixelShaderInput input) : SV_TARGET
+    {
+        const float3 offset = {-0.0627451017, -0.501960814, -0.501960814};
+        const float3 Rcoeff = {1.1644,  0.0000,  1.5960};
+        const float3 Gcoeff = {1.1644, -0.3918, -0.8130};
+        const float3 Bcoeff = {1.1644,  2.0172,  0.0000};
+
+        float4 Output;
+
+        float3 yuv;
+        yuv.x = theTextureY.Sample(theSampler, input.tex).r;
+        yuv.y = theTextureU.Sample(theSampler, input.tex).r;
+        yuv.z = theTextureV.Sample(theSampler, input.tex).r;
+
+        yuv += offset;
+        Output.r = dot(yuv, Rcoeff);
+        Output.g = dot(yuv, Gcoeff);
+        Output.b = dot(yuv, Bcoeff);
+        Output.a = 1.0f;
+
+        return Output * input.color;
+    }
+*/
+static const DWORD D3D9_PixelShader_YUV_BT601[] = {
+    0xffff0200, 0x0044fffe, 0x42415443, 0x0000001c, 0x000000d7, 0xffff0200,
+    0x00000003, 0x0000001c, 0x00000100, 0x000000d0, 0x00000058, 0x00010003,
+    0x00000001, 0x00000070, 0x00000000, 0x00000080, 0x00020003, 0x00000001,
+    0x00000098, 0x00000000, 0x000000a8, 0x00000003, 0x00000001, 0x000000c0,
+    0x00000000, 0x53656874, 0x6c706d61, 0x742b7265, 0x65546568, 0x72757478,
+    0xab005565, 0x00070004, 0x00040001, 0x00000001, 0x00000000, 0x53656874,
+    0x6c706d61, 0x742b7265, 0x65546568, 0x72757478, 0xab005665, 0x00070004,
+    0x00040001, 0x00000001, 0x00000000, 0x53656874, 0x6c706d61, 0x742b7265,
+    0x65546568, 0x72757478, 0xab005965, 0x00070004, 0x00040001, 0x00000001,
+    0x00000000, 0x325f7370, 0x4d00305f, 0x6f726369, 0x74666f73, 0x29522820,
+    0x534c4820, 0x6853204c, 0x72656461, 0x6d6f4320, 0x656c6970, 0x2e362072,
+    0x36392e33, 0x312e3030, 0x34383336, 0xababab00, 0x05000051, 0xa00f0000,
+    0xbd808081, 0xbf008081, 0xbf008081, 0x3f800000, 0x05000051, 0xa00f0001,
+    0x3f950b0f, 0x00000000, 0x3fcc49ba, 0x00000000, 0x05000051, 0xa00f0002,
+    0x3f950b0f, 0xbec89a02, 0xbf5020c5, 0x00000000, 0x05000051, 0xa00f0003,
+    0x3f950b0f, 0x400119ce, 0x00000000, 0x00000000, 0x0200001f, 0x80000000,
+    0xb0030000, 0x0200001f, 0x80000000, 0x900f0000, 0x0200001f, 0x90000000,
+    0xa00f0800, 0x0200001f, 0x90000000, 0xa00f0801, 0x0200001f, 0x90000000,
+    0xa00f0802, 0x03000042, 0x800f0000, 0xb0e40000, 0xa0e40800, 0x03000042,
+    0x800f0001, 0xb0e40000, 0xa0e40801, 0x03000042, 0x800f0002, 0xb0e40000,
+    0xa0e40802, 0x02000001, 0x80020000, 0x80000001, 0x02000001, 0x80040000,
+    0x80000002, 0x03000002, 0x80070000, 0x80e40000, 0xa0e40000, 0x03000008,
+    0x80010001, 0x80e40000, 0xa0e40001, 0x03000008, 0x80020001, 0x80e40000,
+    0xa0e40002, 0x0400005a, 0x80040001, 0x80e40000, 0xa0e40003, 0xa0aa0003,
+    0x02000001, 0x80080001, 0xa0ff0000, 0x03000005, 0x800f0000, 0x80e40001,
+    0x90e40000, 0x02000001, 0x800f0800, 0x80e40000, 0x0000ffff
+};
+
+/* --- D3D9_PixelShader_YUV_BT709.hlsl ---
+    Texture2D theTextureY : register(t0);
+    Texture2D theTextureU : register(t1);
+    Texture2D theTextureV : register(t2);
+    SamplerState theSampler = sampler_state
+    {
+        addressU = Clamp;
+        addressV = Clamp;
+        mipfilter = NONE;
+        minfilter = LINEAR;
+        magfilter = LINEAR;
+    };
+
+    struct PixelShaderInput
+    {
+        float4 pos : SV_POSITION;
+        float2 tex : TEXCOORD0;
+        float4 color : COLOR0;
+    };
+
+    float4 main(PixelShaderInput input) : SV_TARGET
+    {
+        const float3 offset = {-0.0627451017, -0.501960814, -0.501960814};
+        const float3 Rcoeff = {1.1644,  0.0000,  1.7927};
+        const float3 Gcoeff = {1.1644, -0.2132, -0.5329};
+        const float3 Bcoeff = {1.1644,  2.1124,  0.0000};
+
+        float4 Output;
+
+        float3 yuv;
+        yuv.x = theTextureY.Sample(theSampler, input.tex).r;
+        yuv.y = theTextureU.Sample(theSampler, input.tex).r;
+        yuv.z = theTextureV.Sample(theSampler, input.tex).r;
+
+        yuv += offset;
+        Output.r = dot(yuv, Rcoeff);
+        Output.g = dot(yuv, Gcoeff);
+        Output.b = dot(yuv, Bcoeff);
+        Output.a = 1.0f;
+
+        return Output * input.color;
+    }
+*/
+static const DWORD D3D9_PixelShader_YUV_BT709[] = {
+    0xffff0200, 0x0044fffe, 0x42415443, 0x0000001c, 0x000000d7, 0xffff0200,
+    0x00000003, 0x0000001c, 0x00000100, 0x000000d0, 0x00000058, 0x00010003,
+    0x00000001, 0x00000070, 0x00000000, 0x00000080, 0x00020003, 0x00000001,
+    0x00000098, 0x00000000, 0x000000a8, 0x00000003, 0x00000001, 0x000000c0,
+    0x00000000, 0x53656874, 0x6c706d61, 0x742b7265, 0x65546568, 0x72757478,
+    0xab005565, 0x00070004, 0x00040001, 0x00000001, 0x00000000, 0x53656874,
+    0x6c706d61, 0x742b7265, 0x65546568, 0x72757478, 0xab005665, 0x00070004,
+    0x00040001, 0x00000001, 0x00000000, 0x53656874, 0x6c706d61, 0x742b7265,
+    0x65546568, 0x72757478, 0xab005965, 0x00070004, 0x00040001, 0x00000001,
+    0x00000000, 0x325f7370, 0x4d00305f, 0x6f726369, 0x74666f73, 0x29522820,
+    0x534c4820, 0x6853204c, 0x72656461, 0x6d6f4320, 0x656c6970, 0x2e362072,
+    0x36392e33, 0x312e3030, 0x34383336, 0xababab00, 0x05000051, 0xa00f0000,
+    0xbd808081, 0xbf008081, 0xbf008081, 0x3f800000, 0x05000051, 0xa00f0001,
+    0x3f950b0f, 0x00000000, 0x3fe57732, 0x00000000, 0x05000051, 0xa00f0002,
+    0x3f950b0f, 0xbe5a511a, 0xbf086c22, 0x00000000, 0x05000051, 0xa00f0003,
+    0x3f950b0f, 0x40073190, 0x00000000, 0x00000000, 0x0200001f, 0x80000000,
+    0xb0030000, 0x0200001f, 0x80000000, 0x900f0000, 0x0200001f, 0x90000000,
+    0xa00f0800, 0x0200001f, 0x90000000, 0xa00f0801, 0x0200001f, 0x90000000,
+    0xa00f0802, 0x03000042, 0x800f0000, 0xb0e40000, 0xa0e40800, 0x03000042,
+    0x800f0001, 0xb0e40000, 0xa0e40801, 0x03000042, 0x800f0002, 0xb0e40000,
+    0xa0e40802, 0x02000001, 0x80020000, 0x80000001, 0x02000001, 0x80040000,
+    0x80000002, 0x03000002, 0x80070000, 0x80e40000, 0xa0e40000, 0x03000008,
+    0x80010001, 0x80e40000, 0xa0e40001, 0x03000008, 0x80020001, 0x80e40000,
+    0xa0e40002, 0x0400005a, 0x80040001, 0x80e40000, 0xa0e40003, 0xa0aa0003,
+    0x02000001, 0x80080001, 0xa0ff0000, 0x03000005, 0x800f0000, 0x80e40001,
+    0x90e40000, 0x02000001, 0x800f0800, 0x80e40000, 0x0000ffff
+};
+
+
+static const DWORD *D3D9_shaders[] = {
+    D3D9_PixelShader_YUV_JPEG,
+    D3D9_PixelShader_YUV_BT601,
+    D3D9_PixelShader_YUV_BT709,
+};
+
+HRESULT D3D9_CreatePixelShader(IDirect3DDevice9 *d3dDevice, D3D9_Shader shader, IDirect3DPixelShader9 **pixelShader)
+{
+    return IDirect3DDevice9_CreatePixelShader(d3dDevice, D3D9_shaders[shader], pixelShader);
+}
+
+#endif /* SDL_VIDEO_RENDER_D3D && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/direct3d/SDL_shaders_d3d.h

@@ -0,0 +1,34 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+/* D3D9 shader implementation */
+
+typedef enum {
+    SHADER_YUV_JPEG,
+    SHADER_YUV_BT601,
+    SHADER_YUV_BT709,
+    NUM_SHADERS
+} D3D9_Shader;
+
+extern HRESULT D3D9_CreatePixelShader(IDirect3DDevice9 *d3dDevice, D3D9_Shader shader, IDirect3DPixelShader9 **pixelShader);
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/direct3d11/SDL_render_winrt.cpp

@@ -0,0 +1,116 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_D3D11 && !SDL_RENDER_DISABLED
+
+#include "SDL_syswm.h"
+#include "../../video/winrt/SDL_winrtvideo_cpp.h"
+extern "C" {
+#include "../SDL_sysrender.h"
+}
+
+#include <windows.ui.core.h>
+#include <windows.graphics.display.h>
+
+#if WINAPI_FAMILY == WINAPI_FAMILY_APP
+#include <windows.ui.xaml.media.dxinterop.h>
+#endif
+
+using namespace Windows::UI::Core;
+using namespace Windows::Graphics::Display;
+
+#include <DXGI.h>
+
+#include "SDL_render_winrt.h"
+
+
+extern "C" void *
+D3D11_GetCoreWindowFromSDLRenderer(SDL_Renderer * renderer)
+{
+    SDL_Window * sdlWindow = renderer->window;
+    if ( ! renderer->window ) {
+        return NULL;
+    }
+
+    SDL_SysWMinfo sdlWindowInfo;
+    SDL_VERSION(&sdlWindowInfo.version);
+    if ( ! SDL_GetWindowWMInfo(sdlWindow, &sdlWindowInfo) ) {
+        return NULL;
+    }
+
+    if (sdlWindowInfo.subsystem != SDL_SYSWM_WINRT) {
+        return NULL;
+    }
+
+    if (!sdlWindowInfo.info.winrt.window) {
+        return NULL;
+    }
+
+    ABI::Windows::UI::Core::ICoreWindow *coreWindow = NULL;
+    if (FAILED(sdlWindowInfo.info.winrt.window->QueryInterface(&coreWindow))) {
+        return NULL;
+    }
+
+    IUnknown *coreWindowAsIUnknown = NULL;
+    coreWindow->QueryInterface(&coreWindowAsIUnknown);
+    coreWindow->Release();
+
+    return coreWindowAsIUnknown;
+}
+
+extern "C" DXGI_MODE_ROTATION
+D3D11_GetCurrentRotation()
+{
+    const DisplayOrientations currentOrientation = WINRT_DISPLAY_PROPERTY(CurrentOrientation);
+
+    switch (currentOrientation) {
+
+#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
+    /* Windows Phone rotations */
+    case DisplayOrientations::Landscape:
+        return DXGI_MODE_ROTATION_ROTATE90;
+    case DisplayOrientations::Portrait:
+        return DXGI_MODE_ROTATION_IDENTITY;
+    case DisplayOrientations::LandscapeFlipped:
+        return DXGI_MODE_ROTATION_ROTATE270;
+    case DisplayOrientations::PortraitFlipped:
+        return DXGI_MODE_ROTATION_ROTATE180;
+#else
+    /* Non-Windows-Phone rotations (ex: Windows 8, Windows RT) */
+    case DisplayOrientations::Landscape:
+        return DXGI_MODE_ROTATION_IDENTITY;
+    case DisplayOrientations::Portrait:
+        return DXGI_MODE_ROTATION_ROTATE270;
+    case DisplayOrientations::LandscapeFlipped:
+        return DXGI_MODE_ROTATION_ROTATE180;
+    case DisplayOrientations::PortraitFlipped:
+        return DXGI_MODE_ROTATION_ROTATE90;
+#endif /* WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP */
+    }
+
+    return DXGI_MODE_ROTATION_IDENTITY;
+}
+
+
+#endif /* SDL_VIDEO_RENDER_D3D11 && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/direct3d11/SDL_render_winrt.h

@@ -0,0 +1,40 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_D3D11 && !SDL_RENDER_DISABLED
+
+#include "SDL_render.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void * D3D11_GetCoreWindowFromSDLRenderer(SDL_Renderer * renderer);
+DXGI_MODE_ROTATION D3D11_GetCurrentRotation();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SDL_VIDEO_RENDER_D3D11 && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/direct3d11/SDL_shaders_d3d11.h

@@ -0,0 +1,43 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+/* D3D11 shader implementation */
+
+typedef enum {
+    SHADER_SOLID,
+    SHADER_RGB,
+    SHADER_YUV_JPEG,
+    SHADER_YUV_BT601,
+    SHADER_YUV_BT709,
+    SHADER_NV12_JPEG,
+    SHADER_NV12_BT601,
+    SHADER_NV12_BT709,
+    SHADER_NV21_JPEG,
+    SHADER_NV21_BT601,
+    SHADER_NV21_BT709,
+    NUM_SHADERS
+} D3D11_Shader;
+
+extern int D3D11_CreateVertexShader(ID3D11Device1 *d3dDevice, ID3D11VertexShader **vertexShader, ID3D11InputLayout **inputLayout);
+extern int D3D11_CreatePixelShader(ID3D11Device1 *d3dDevice, D3D11_Shader shader, ID3D11PixelShader **pixelShader);
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/metal/SDL_shaders_metal.metal

@@ -0,0 +1,117 @@
+#include <metal_texture>
+#include <metal_matrix>
+
+using namespace metal;
+
+struct SolidVertexInput
+{
+    float2 position [[attribute(0)]];
+};
+
+struct SolidVertexOutput
+{
+    float4 position [[position]];
+    float pointSize [[point_size]];
+};
+
+vertex SolidVertexOutput SDL_Solid_vertex(SolidVertexInput in [[stage_in]],
+                                          constant float4x4 &projection [[buffer(2)]],
+                                          constant float4x4 &transform [[buffer(3)]])
+{
+    SolidVertexOutput v;
+    v.position = (projection * transform) * float4(in.position, 0.0f, 1.0f);
+    v.pointSize = 1.0f;
+    return v;
+}
+
+fragment float4 SDL_Solid_fragment(const device float4 &col [[buffer(0)]])
+{
+    return col;
+}
+
+struct CopyVertexInput
+{
+    float2 position [[attribute(0)]];
+    float2 texcoord [[attribute(1)]];
+};
+
+struct CopyVertexOutput
+{
+    float4 position [[position]];
+    float2 texcoord;
+};
+
+vertex CopyVertexOutput SDL_Copy_vertex(CopyVertexInput in [[stage_in]],
+                                        constant float4x4 &projection [[buffer(2)]],
+                                        constant float4x4 &transform [[buffer(3)]])
+{
+    CopyVertexOutput v;
+    v.position = (projection * transform) * float4(in.position, 0.0f, 1.0f);
+    v.texcoord = in.texcoord;
+    return v;
+}
+
+fragment float4 SDL_Copy_fragment(CopyVertexOutput vert [[stage_in]],
+                                  const device float4 &col [[buffer(0)]],
+                                  texture2d<float> tex [[texture(0)]],
+                                  sampler s [[sampler(0)]])
+{
+    return tex.sample(s, vert.texcoord) * col;
+}
+
+struct YUVDecode
+{
+    float3 offset;
+    float3 Rcoeff;
+    float3 Gcoeff;
+    float3 Bcoeff;
+};
+
+fragment float4 SDL_YUV_fragment(CopyVertexOutput vert [[stage_in]],
+                                 const device float4 &col [[buffer(0)]],
+                                 constant YUVDecode &decode [[buffer(1)]],
+                                 texture2d<float> texY [[texture(0)]],
+                                 texture2d_array<float> texUV [[texture(1)]],
+                                 sampler s [[sampler(0)]])
+{
+    float3 yuv;
+    yuv.x = texY.sample(s, vert.texcoord).r;
+    yuv.y = texUV.sample(s, vert.texcoord, 0).r;
+    yuv.z = texUV.sample(s, vert.texcoord, 1).r;
+
+    yuv += decode.offset;
+
+    return col * float4(dot(yuv, decode.Rcoeff), dot(yuv, decode.Gcoeff), dot(yuv, decode.Bcoeff), 1.0);
+}
+
+fragment float4 SDL_NV12_fragment(CopyVertexOutput vert [[stage_in]],
+                                 const device float4 &col [[buffer(0)]],
+                                 constant YUVDecode &decode [[buffer(1)]],
+                                 texture2d<float> texY [[texture(0)]],
+                                 texture2d<float> texUV [[texture(1)]],
+                                 sampler s [[sampler(0)]])
+{
+    float3 yuv;
+    yuv.x = texY.sample(s, vert.texcoord).r;
+    yuv.yz = texUV.sample(s, vert.texcoord).rg;
+
+    yuv += decode.offset;
+
+    return col * float4(dot(yuv, decode.Rcoeff), dot(yuv, decode.Gcoeff), dot(yuv, decode.Bcoeff), 1.0);
+}
+
+fragment float4 SDL_NV21_fragment(CopyVertexOutput vert [[stage_in]],
+                                 const device float4 &col [[buffer(0)]],
+                                 constant YUVDecode &decode [[buffer(1)]],
+                                 texture2d<float> texY [[texture(0)]],
+                                 texture2d<float> texUV [[texture(1)]],
+                                 sampler s [[sampler(0)]])
+{
+    float3 yuv;
+    yuv.x = texY.sample(s, vert.texcoord).r;
+    yuv.yz = texUV.sample(s, vert.texcoord).gr;
+
+    yuv += decode.offset;
+
+    return col * float4(dot(yuv, decode.Rcoeff), dot(yuv, decode.Gcoeff), dot(yuv, decode.Bcoeff), 1.0);
+}

externals/SDL/src/render/metal/build-metal-shaders.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -x
+set -e
+cd `dirname "$0"`
+
+generate_shaders()
+{
+	fileplatform=$1
+    compileplatform=$2
+    sdkplatform=$3
+    minversion=$4
+    xcrun -sdk $sdkplatform metal -c -std=$compileplatform-metal1.1 -m$sdkplatform-version-min=$minversion -Wall -O3 -o ./sdl.air ./SDL_shaders_metal.metal || exit $?
+    xcrun -sdk $sdkplatform metal-ar rc sdl.metalar sdl.air || exit $?
+    xcrun -sdk $sdkplatform metallib -o sdl.metallib sdl.metalar || exit $?
+    xxd -i sdl.metallib | perl -w -p -e 's/\Aunsigned /const unsigned /;' >./SDL_shaders_metal_$fileplatform.h
+    rm -f sdl.air sdl.metalar sdl.metallib
+}
+
+generate_shaders osx osx macosx 10.11
+generate_shaders ios ios iphoneos 8.0
+generate_shaders tvos ios appletvos 9.0

externals/SDL/src/render/opengl/SDL_glfuncs.h

@@ -0,0 +1,478 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/* list of OpenGL functions sorted alphabetically
+   If you need to use a GL function from the SDL video subsystem,
+   change its entry from SDL_PROC_UNUSED to SDL_PROC and rebuild.
+*/
+#define SDL_PROC_UNUSED(ret,func,params)
+
+SDL_PROC_UNUSED(void, glAccum, (GLenum, GLfloat))
+SDL_PROC_UNUSED(void, glAlphaFunc, (GLenum, GLclampf))
+SDL_PROC_UNUSED(GLboolean, glAreTexturesResident,
+                (GLsizei, const GLuint *, GLboolean *))
+SDL_PROC_UNUSED(void, glArrayElement, (GLint))
+SDL_PROC(void, glBegin, (GLenum))
+SDL_PROC(void, glBindTexture, (GLenum, GLuint))
+SDL_PROC_UNUSED(void, glBitmap,
+                (GLsizei, GLsizei, GLfloat, GLfloat, GLfloat, GLfloat,
+                 const GLubyte *))
+SDL_PROC(void, glBlendEquation, (GLenum))
+SDL_PROC_UNUSED(void, glBlendFunc, (GLenum, GLenum))
+SDL_PROC(void, glBlendFuncSeparate, (GLenum, GLenum, GLenum, GLenum))
+SDL_PROC_UNUSED(void, glCallList, (GLuint))
+SDL_PROC_UNUSED(void, glCallLists, (GLsizei, GLenum, const GLvoid *))
+SDL_PROC(void, glClear, (GLbitfield))
+SDL_PROC_UNUSED(void, glClearAccum, (GLfloat, GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glClearColor, (GLclampf, GLclampf, GLclampf, GLclampf))
+SDL_PROC_UNUSED(void, glClearDepth, (GLclampd))
+SDL_PROC_UNUSED(void, glClearIndex, (GLfloat))
+SDL_PROC_UNUSED(void, glClearStencil, (GLint))
+SDL_PROC_UNUSED(void, glClipPlane, (GLenum, const GLdouble *))
+SDL_PROC_UNUSED(void, glColor3b, (GLbyte, GLbyte, GLbyte))
+SDL_PROC_UNUSED(void, glColor3bv, (const GLbyte *))
+SDL_PROC_UNUSED(void, glColor3d, (GLdouble, GLdouble, GLdouble))
+SDL_PROC_UNUSED(void, glColor3dv, (const GLdouble *))
+SDL_PROC_UNUSED(void, glColor3f, (GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glColor3fv, (const GLfloat *))
+SDL_PROC_UNUSED(void, glColor3i, (GLint, GLint, GLint))
+SDL_PROC_UNUSED(void, glColor3iv, (const GLint *))
+SDL_PROC_UNUSED(void, glColor3s, (GLshort, GLshort, GLshort))
+SDL_PROC_UNUSED(void, glColor3sv, (const GLshort *))
+SDL_PROC_UNUSED(void, glColor3ub, (GLubyte, GLubyte, GLubyte))
+SDL_PROC_UNUSED(void, glColor3ubv, (const GLubyte *))
+SDL_PROC_UNUSED(void, glColor3ui, (GLuint, GLuint, GLuint))
+SDL_PROC_UNUSED(void, glColor3uiv, (const GLuint *))
+SDL_PROC_UNUSED(void, glColor3us, (GLushort, GLushort, GLushort))
+SDL_PROC_UNUSED(void, glColor3usv, (const GLushort *))
+SDL_PROC_UNUSED(void, glColor4b, (GLbyte, GLbyte, GLbyte, GLbyte))
+SDL_PROC_UNUSED(void, glColor4bv, (const GLbyte *))
+SDL_PROC_UNUSED(void, glColor4d, (GLdouble, GLdouble, GLdouble, GLdouble))
+SDL_PROC_UNUSED(void, glColor4dv, (const GLdouble *))
+SDL_PROC(void, glColor4f, (GLfloat, GLfloat, GLfloat, GLfloat))
+SDL_PROC_UNUSED(void, glColor4fv, (const GLfloat *))
+SDL_PROC_UNUSED(void, glColor4i, (GLint, GLint, GLint, GLint))
+SDL_PROC_UNUSED(void, glColor4iv, (const GLint *))
+SDL_PROC_UNUSED(void, glColor4s, (GLshort, GLshort, GLshort, GLshort))
+SDL_PROC_UNUSED(void, glColor4sv, (const GLshort *))
+SDL_PROC_UNUSED(void, glColor4ub,
+                (GLubyte red, GLubyte green, GLubyte blue, GLubyte alpha))
+SDL_PROC_UNUSED(void, glColor4ubv, (const GLubyte * v))
+SDL_PROC_UNUSED(void, glColor4ui,
+                (GLuint red, GLuint green, GLuint blue, GLuint alpha))
+SDL_PROC_UNUSED(void, glColor4uiv, (const GLuint * v))
+SDL_PROC_UNUSED(void, glColor4us,
+                (GLushort red, GLushort green, GLushort blue, GLushort alpha))
+SDL_PROC_UNUSED(void, glColor4usv, (const GLushort * v))
+SDL_PROC_UNUSED(void, glColorMask,
+                (GLboolean red, GLboolean green, GLboolean blue,
+                 GLboolean alpha))
+SDL_PROC_UNUSED(void, glColorMaterial, (GLenum face, GLenum mode))
+SDL_PROC_UNUSED(void, glColorPointer,
+                (GLint size, GLenum type, GLsizei stride,
+                 const GLvoid * pointer))
+SDL_PROC_UNUSED(void, glCopyPixels,
+                (GLint x, GLint y, GLsizei width, GLsizei height,
+                 GLenum type))
+SDL_PROC_UNUSED(void, glCopyTexImage1D,
+                (GLenum target, GLint level, GLenum internalFormat, GLint x,
+                 GLint y, GLsizei width, GLint border))
+SDL_PROC_UNUSED(void, glCopyTexImage2D,
+                (GLenum target, GLint level, GLenum internalFormat, GLint x,
+                 GLint y, GLsizei width, GLsizei height, GLint border))
+SDL_PROC_UNUSED(void, glCopyTexSubImage1D,
+                (GLenum target, GLint level, GLint xoffset, GLint x, GLint y,
+                 GLsizei width))
+SDL_PROC_UNUSED(void, glCopyTexSubImage2D,
+                (GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                 GLint x, GLint y, GLsizei width, GLsizei height))
+SDL_PROC_UNUSED(void, glCullFace, (GLenum mode))
+SDL_PROC_UNUSED(void, glDeleteLists, (GLuint list, GLsizei range))
+SDL_PROC(void, glDeleteTextures, (GLsizei n, const GLuint * textures))
+SDL_PROC(void, glDepthFunc, (GLenum func))
+SDL_PROC_UNUSED(void, glDepthMask, (GLboolean flag))
+SDL_PROC_UNUSED(void, glDepthRange, (GLclampd zNear, GLclampd zFar))
+SDL_PROC(void, glDisable, (GLenum cap))
+SDL_PROC_UNUSED(void, glDisableClientState, (GLenum array))
+SDL_PROC_UNUSED(void, glDrawArrays, (GLenum mode, GLint first, GLsizei count))
+SDL_PROC_UNUSED(void, glDrawBuffer, (GLenum mode))
+SDL_PROC_UNUSED(void, glDrawElements,
+                (GLenum mode, GLsizei count, GLenum type,
+                 const GLvoid * indices))
+SDL_PROC(void, glDrawPixels,
+         (GLsizei width, GLsizei height, GLenum format, GLenum type,
+          const GLvoid * pixels))
+SDL_PROC_UNUSED(void, glEdgeFlag, (GLboolean flag))
+SDL_PROC_UNUSED(void, glEdgeFlagPointer,
+                (GLsizei stride, const GLvoid * pointer))
+SDL_PROC_UNUSED(void, glEdgeFlagv, (const GLboolean * flag))
+SDL_PROC(void, glEnable, (GLenum cap))
+SDL_PROC_UNUSED(void, glEnableClientState, (GLenum array))
+SDL_PROC(void, glEnd, (void))
+SDL_PROC_UNUSED(void, glEndList, (void))
+SDL_PROC_UNUSED(void, glEvalCoord1d, (GLdouble u))
+SDL_PROC_UNUSED(void, glEvalCoord1dv, (const GLdouble * u))
+SDL_PROC_UNUSED(void, glEvalCoord1f, (GLfloat u))
+SDL_PROC_UNUSED(void, glEvalCoord1fv, (const GLfloat * u))
+SDL_PROC_UNUSED(void, glEvalCoord2d, (GLdouble u, GLdouble v))
+SDL_PROC_UNUSED(void, glEvalCoord2dv, (const GLdouble * u))
+SDL_PROC_UNUSED(void, glEvalCoord2f, (GLfloat u, GLfloat v))
+SDL_PROC_UNUSED(void, glEvalCoord2fv, (const GLfloat * u))
+SDL_PROC_UNUSED(void, glEvalMesh1, (GLenum mode, GLint i1, GLint i2))
+SDL_PROC_UNUSED(void, glEvalMesh2,
+                (GLenum mode, GLint i1, GLint i2, GLint j1, GLint j2))
+SDL_PROC_UNUSED(void, glEvalPoint1, (GLint i))
+SDL_PROC_UNUSED(void, glEvalPoint2, (GLint i, GLint j))
+SDL_PROC_UNUSED(void, glFeedbackBuffer,
+                (GLsizei size, GLenum type, GLfloat * buffer))
+SDL_PROC_UNUSED(void, glFinish, (void))
+SDL_PROC_UNUSED(void, glFlush, (void))
+SDL_PROC_UNUSED(void, glFogf, (GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glFogfv, (GLenum pname, const GLfloat * params))
+SDL_PROC_UNUSED(void, glFogi, (GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glFogiv, (GLenum pname, const GLint * params))
+SDL_PROC_UNUSED(void, glFrontFace, (GLenum mode))
+SDL_PROC_UNUSED(void, glFrustum,
+                (GLdouble left, GLdouble right, GLdouble bottom,
+                 GLdouble top, GLdouble zNear, GLdouble zFar))
+SDL_PROC_UNUSED(GLuint, glGenLists, (GLsizei range))
+SDL_PROC(void, glGenTextures, (GLsizei n, GLuint * textures))
+SDL_PROC_UNUSED(void, glGetBooleanv, (GLenum pname, GLboolean * params))
+SDL_PROC_UNUSED(void, glGetClipPlane, (GLenum plane, GLdouble * equation))
+SDL_PROC_UNUSED(void, glGetDoublev, (GLenum pname, GLdouble * params))
+SDL_PROC(GLenum, glGetError, (void))
+SDL_PROC_UNUSED(void, glGetFloatv, (GLenum pname, GLfloat * params))
+SDL_PROC(void, glGetIntegerv, (GLenum pname, GLint * params))
+SDL_PROC_UNUSED(void, glGetLightfv,
+                (GLenum light, GLenum pname, GLfloat * params))
+SDL_PROC_UNUSED(void, glGetLightiv,
+                (GLenum light, GLenum pname, GLint * params))
+SDL_PROC_UNUSED(void, glGetMapdv, (GLenum target, GLenum query, GLdouble * v))
+SDL_PROC_UNUSED(void, glGetMapfv, (GLenum target, GLenum query, GLfloat * v))
+SDL_PROC_UNUSED(void, glGetMapiv, (GLenum target, GLenum query, GLint * v))
+SDL_PROC_UNUSED(void, glGetMaterialfv,
+                (GLenum face, GLenum pname, GLfloat * params))
+SDL_PROC_UNUSED(void, glGetMaterialiv,
+                (GLenum face, GLenum pname, GLint * params))
+SDL_PROC_UNUSED(void, glGetPixelMapfv, (GLenum map, GLfloat * values))
+SDL_PROC_UNUSED(void, glGetPixelMapuiv, (GLenum map, GLuint * values))
+SDL_PROC_UNUSED(void, glGetPixelMapusv, (GLenum map, GLushort * values))
+SDL_PROC(void, glGetPointerv, (GLenum pname, GLvoid * *params))
+SDL_PROC_UNUSED(void, glGetPolygonStipple, (GLubyte * mask))
+SDL_PROC(const GLubyte *, glGetString, (GLenum name))
+SDL_PROC_UNUSED(void, glGetTexEnvfv,
+                (GLenum target, GLenum pname, GLfloat * params))
+SDL_PROC_UNUSED(void, glGetTexEnviv,
+                (GLenum target, GLenum pname, GLint * params))
+SDL_PROC_UNUSED(void, glGetTexGendv,
+                (GLenum coord, GLenum pname, GLdouble * params))
+SDL_PROC_UNUSED(void, glGetTexGenfv,
+                (GLenum coord, GLenum pname, GLfloat * params))
+SDL_PROC_UNUSED(void, glGetTexGeniv,
+                (GLenum coord, GLenum pname, GLint * params))
+SDL_PROC_UNUSED(void, glGetTexImage,
+                (GLenum target, GLint level, GLenum format, GLenum type,
+                 GLvoid * pixels))
+SDL_PROC_UNUSED(void, glGetTexLevelParameterfv,
+                (GLenum target, GLint level, GLenum pname, GLfloat * params))
+SDL_PROC_UNUSED(void, glGetTexLevelParameteriv,
+                (GLenum target, GLint level, GLenum pname, GLint * params))
+SDL_PROC_UNUSED(void, glGetTexParameterfv,
+                (GLenum target, GLenum pname, GLfloat * params))
+SDL_PROC_UNUSED(void, glGetTexParameteriv,
+                (GLenum target, GLenum pname, GLint * params))
+SDL_PROC_UNUSED(void, glHint, (GLenum target, GLenum mode))
+SDL_PROC_UNUSED(void, glIndexMask, (GLuint mask))
+SDL_PROC_UNUSED(void, glIndexPointer,
+                (GLenum type, GLsizei stride, const GLvoid * pointer))
+SDL_PROC_UNUSED(void, glIndexd, (GLdouble c))
+SDL_PROC_UNUSED(void, glIndexdv, (const GLdouble * c))
+SDL_PROC_UNUSED(void, glIndexf, (GLfloat c))
+SDL_PROC_UNUSED(void, glIndexfv, (const GLfloat * c))
+SDL_PROC_UNUSED(void, glIndexi, (GLint c))
+SDL_PROC_UNUSED(void, glIndexiv, (const GLint * c))
+SDL_PROC_UNUSED(void, glIndexs, (GLshort c))
+SDL_PROC_UNUSED(void, glIndexsv, (const GLshort * c))
+SDL_PROC_UNUSED(void, glIndexub, (GLubyte c))
+SDL_PROC_UNUSED(void, glIndexubv, (const GLubyte * c))
+SDL_PROC_UNUSED(void, glInitNames, (void))
+SDL_PROC_UNUSED(void, glInterleavedArrays,
+                (GLenum format, GLsizei stride, const GLvoid * pointer))
+SDL_PROC_UNUSED(GLboolean, glIsEnabled, (GLenum cap))
+SDL_PROC_UNUSED(GLboolean, glIsList, (GLuint list))
+SDL_PROC_UNUSED(GLboolean, glIsTexture, (GLuint texture))
+SDL_PROC_UNUSED(void, glLightModelf, (GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glLightModelfv, (GLenum pname, const GLfloat * params))
+SDL_PROC_UNUSED(void, glLightModeli, (GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glLightModeliv, (GLenum pname, const GLint * params))
+SDL_PROC_UNUSED(void, glLightf, (GLenum light, GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glLightfv,
+                (GLenum light, GLenum pname, const GLfloat * params))
+SDL_PROC_UNUSED(void, glLighti, (GLenum light, GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glLightiv,
+                (GLenum light, GLenum pname, const GLint * params))
+SDL_PROC_UNUSED(void, glLineStipple, (GLint factor, GLushort pattern))
+SDL_PROC(void, glLineWidth, (GLfloat width))
+SDL_PROC_UNUSED(void, glListBase, (GLuint base))
+SDL_PROC(void, glLoadIdentity, (void))
+SDL_PROC_UNUSED(void, glLoadMatrixd, (const GLdouble * m))
+SDL_PROC_UNUSED(void, glLoadMatrixf, (const GLfloat * m))
+SDL_PROC_UNUSED(void, glLoadName, (GLuint name))
+SDL_PROC_UNUSED(void, glLogicOp, (GLenum opcode))
+SDL_PROC_UNUSED(void, glMap1d,
+                (GLenum target, GLdouble u1, GLdouble u2, GLint stride,
+                 GLint order, const GLdouble * points))
+SDL_PROC_UNUSED(void, glMap1f,
+                (GLenum target, GLfloat u1, GLfloat u2, GLint stride,
+                 GLint order, const GLfloat * points))
+SDL_PROC_UNUSED(void, glMap2d,
+                (GLenum target, GLdouble u1, GLdouble u2, GLint ustride,
+                 GLint uorder, GLdouble v1, GLdouble v2, GLint vstride,
+                 GLint vorder, const GLdouble * points))
+SDL_PROC_UNUSED(void, glMap2f,
+                (GLenum target, GLfloat u1, GLfloat u2, GLint ustride,
+                 GLint uorder, GLfloat v1, GLfloat v2, GLint vstride,
+                 GLint vorder, const GLfloat * points))
+SDL_PROC_UNUSED(void, glMapGrid1d, (GLint un, GLdouble u1, GLdouble u2))
+SDL_PROC_UNUSED(void, glMapGrid1f, (GLint un, GLfloat u1, GLfloat u2))
+SDL_PROC_UNUSED(void, glMapGrid2d,
+                (GLint un, GLdouble u1, GLdouble u2, GLint vn, GLdouble v1,
+                 GLdouble v2))
+SDL_PROC_UNUSED(void, glMapGrid2f,
+                (GLint un, GLfloat u1, GLfloat u2, GLint vn, GLfloat v1,
+                 GLfloat v2))
+SDL_PROC_UNUSED(void, glMaterialf, (GLenum face, GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glMaterialfv,
+                (GLenum face, GLenum pname, const GLfloat * params))
+SDL_PROC_UNUSED(void, glMateriali, (GLenum face, GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glMaterialiv,
+                (GLenum face, GLenum pname, const GLint * params))
+SDL_PROC(void, glMatrixMode, (GLenum mode))
+SDL_PROC_UNUSED(void, glMultMatrixd, (const GLdouble * m))
+SDL_PROC_UNUSED(void, glMultMatrixf, (const GLfloat * m))
+SDL_PROC_UNUSED(void, glNewList, (GLuint list, GLenum mode))
+SDL_PROC_UNUSED(void, glNormal3b, (GLbyte nx, GLbyte ny, GLbyte nz))
+SDL_PROC_UNUSED(void, glNormal3bv, (const GLbyte * v))
+SDL_PROC_UNUSED(void, glNormal3d, (GLdouble nx, GLdouble ny, GLdouble nz))
+SDL_PROC_UNUSED(void, glNormal3dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glNormal3f, (GLfloat nx, GLfloat ny, GLfloat nz))
+SDL_PROC_UNUSED(void, glNormal3fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glNormal3i, (GLint nx, GLint ny, GLint nz))
+SDL_PROC_UNUSED(void, glNormal3iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glNormal3s, (GLshort nx, GLshort ny, GLshort nz))
+SDL_PROC_UNUSED(void, glNormal3sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glNormalPointer,
+                (GLenum type, GLsizei stride, const GLvoid * pointer))
+SDL_PROC(void, glOrtho,
+         (GLdouble left, GLdouble right, GLdouble bottom, GLdouble top,
+          GLdouble zNear, GLdouble zFar))
+SDL_PROC_UNUSED(void, glPassThrough, (GLfloat token))
+SDL_PROC_UNUSED(void, glPixelMapfv,
+                (GLenum map, GLsizei mapsize, const GLfloat * values))
+SDL_PROC_UNUSED(void, glPixelMapuiv,
+                (GLenum map, GLsizei mapsize, const GLuint * values))
+SDL_PROC_UNUSED(void, glPixelMapusv,
+                (GLenum map, GLsizei mapsize, const GLushort * values))
+SDL_PROC_UNUSED(void, glPixelStoref, (GLenum pname, GLfloat param))
+SDL_PROC(void, glPixelStorei, (GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glPixelTransferf, (GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glPixelTransferi, (GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glPixelZoom, (GLfloat xfactor, GLfloat yfactor))
+SDL_PROC(void, glPointSize, (GLfloat size))
+SDL_PROC_UNUSED(void, glPolygonMode, (GLenum face, GLenum mode))
+SDL_PROC_UNUSED(void, glPolygonOffset, (GLfloat factor, GLfloat units))
+SDL_PROC_UNUSED(void, glPolygonStipple, (const GLubyte * mask))
+SDL_PROC_UNUSED(void, glPopAttrib, (void))
+SDL_PROC_UNUSED(void, glPopClientAttrib, (void))
+SDL_PROC(void, glPopMatrix, (void))
+SDL_PROC_UNUSED(void, glPopName, (void))
+SDL_PROC_UNUSED(void, glPrioritizeTextures,
+                (GLsizei n, const GLuint * textures,
+                 const GLclampf * priorities))
+SDL_PROC_UNUSED(void, glPushAttrib, (GLbitfield mask))
+SDL_PROC_UNUSED(void, glPushClientAttrib, (GLbitfield mask))
+SDL_PROC(void, glPushMatrix, (void))
+SDL_PROC_UNUSED(void, glPushName, (GLuint name))
+SDL_PROC_UNUSED(void, glRasterPos2d, (GLdouble x, GLdouble y))
+SDL_PROC_UNUSED(void, glRasterPos2dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glRasterPos2f, (GLfloat x, GLfloat y))
+SDL_PROC_UNUSED(void, glRasterPos2fv, (const GLfloat * v))
+SDL_PROC(void, glRasterPos2i, (GLint x, GLint y))
+SDL_PROC_UNUSED(void, glRasterPos2iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glRasterPos2s, (GLshort x, GLshort y))
+SDL_PROC_UNUSED(void, glRasterPos2sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glRasterPos3d, (GLdouble x, GLdouble y, GLdouble z))
+SDL_PROC_UNUSED(void, glRasterPos3dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glRasterPos3f, (GLfloat x, GLfloat y, GLfloat z))
+SDL_PROC_UNUSED(void, glRasterPos3fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glRasterPos3i, (GLint x, GLint y, GLint z))
+SDL_PROC_UNUSED(void, glRasterPos3iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glRasterPos3s, (GLshort x, GLshort y, GLshort z))
+SDL_PROC_UNUSED(void, glRasterPos3sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glRasterPos4d,
+                (GLdouble x, GLdouble y, GLdouble z, GLdouble w))
+SDL_PROC_UNUSED(void, glRasterPos4dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glRasterPos4f,
+                (GLfloat x, GLfloat y, GLfloat z, GLfloat w))
+SDL_PROC_UNUSED(void, glRasterPos4fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glRasterPos4i, (GLint x, GLint y, GLint z, GLint w))
+SDL_PROC_UNUSED(void, glRasterPos4iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glRasterPos4s,
+                (GLshort x, GLshort y, GLshort z, GLshort w))
+SDL_PROC_UNUSED(void, glRasterPos4sv, (const GLshort * v))
+SDL_PROC(void, glReadBuffer, (GLenum mode))
+SDL_PROC(void, glReadPixels,
+         (GLint x, GLint y, GLsizei width, GLsizei height,
+          GLenum format, GLenum type, GLvoid * pixels))
+SDL_PROC_UNUSED(void, glRectd,
+                (GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2))
+SDL_PROC_UNUSED(void, glRectdv, (const GLdouble * v1, const GLdouble * v2))
+SDL_PROC(void, glRectf,
+                (GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2))
+SDL_PROC_UNUSED(void, glRectfv, (const GLfloat * v1, const GLfloat * v2))
+SDL_PROC_UNUSED(void, glRecti, (GLint x1, GLint y1, GLint x2, GLint y2))
+SDL_PROC_UNUSED(void, glRectiv, (const GLint * v1, const GLint * v2))
+SDL_PROC_UNUSED(void, glRects,
+                (GLshort x1, GLshort y1, GLshort x2, GLshort y2))
+SDL_PROC_UNUSED(void, glRectsv, (const GLshort * v1, const GLshort * v2))
+SDL_PROC_UNUSED(GLint, glRenderMode, (GLenum mode))
+SDL_PROC(void, glRotated,
+                (GLdouble angle, GLdouble x, GLdouble y, GLdouble z))
+SDL_PROC(void, glRotatef,
+                (GLfloat angle, GLfloat x, GLfloat y, GLfloat z))
+SDL_PROC_UNUSED(void, glScaled, (GLdouble x, GLdouble y, GLdouble z))
+SDL_PROC_UNUSED(void, glScalef, (GLfloat x, GLfloat y, GLfloat z))
+SDL_PROC(void, glScissor, (GLint x, GLint y, GLsizei width, GLsizei height))
+SDL_PROC_UNUSED(void, glSelectBuffer, (GLsizei size, GLuint * buffer))
+SDL_PROC(void, glShadeModel, (GLenum mode))
+SDL_PROC_UNUSED(void, glStencilFunc, (GLenum func, GLint ref, GLuint mask))
+SDL_PROC_UNUSED(void, glStencilMask, (GLuint mask))
+SDL_PROC_UNUSED(void, glStencilOp, (GLenum fail, GLenum zfail, GLenum zpass))
+SDL_PROC_UNUSED(void, glTexCoord1d, (GLdouble s))
+SDL_PROC_UNUSED(void, glTexCoord1dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glTexCoord1f, (GLfloat s))
+SDL_PROC_UNUSED(void, glTexCoord1fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glTexCoord1i, (GLint s))
+SDL_PROC_UNUSED(void, glTexCoord1iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glTexCoord1s, (GLshort s))
+SDL_PROC_UNUSED(void, glTexCoord1sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glTexCoord2d, (GLdouble s, GLdouble t))
+SDL_PROC_UNUSED(void, glTexCoord2dv, (const GLdouble * v))
+SDL_PROC(void, glTexCoord2f, (GLfloat s, GLfloat t))
+SDL_PROC_UNUSED(void, glTexCoord2fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glTexCoord2i, (GLint s, GLint t))
+SDL_PROC_UNUSED(void, glTexCoord2iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glTexCoord2s, (GLshort s, GLshort t))
+SDL_PROC_UNUSED(void, glTexCoord2sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glTexCoord3d, (GLdouble s, GLdouble t, GLdouble r))
+SDL_PROC_UNUSED(void, glTexCoord3dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glTexCoord3f, (GLfloat s, GLfloat t, GLfloat r))
+SDL_PROC_UNUSED(void, glTexCoord3fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glTexCoord3i, (GLint s, GLint t, GLint r))
+SDL_PROC_UNUSED(void, glTexCoord3iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glTexCoord3s, (GLshort s, GLshort t, GLshort r))
+SDL_PROC_UNUSED(void, glTexCoord3sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glTexCoord4d,
+                (GLdouble s, GLdouble t, GLdouble r, GLdouble q))
+SDL_PROC_UNUSED(void, glTexCoord4dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glTexCoord4f,
+                (GLfloat s, GLfloat t, GLfloat r, GLfloat q))
+SDL_PROC_UNUSED(void, glTexCoord4fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glTexCoord4i, (GLint s, GLint t, GLint r, GLint q))
+SDL_PROC_UNUSED(void, glTexCoord4iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glTexCoord4s,
+                (GLshort s, GLshort t, GLshort r, GLshort q))
+SDL_PROC_UNUSED(void, glTexCoord4sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glTexCoordPointer,
+                (GLint size, GLenum type, GLsizei stride,
+                 const GLvoid * pointer))
+SDL_PROC(void, glTexEnvf, (GLenum target, GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glTexEnvfv,
+                (GLenum target, GLenum pname, const GLfloat * params))
+SDL_PROC_UNUSED(void, glTexEnvi, (GLenum target, GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glTexEnviv,
+                (GLenum target, GLenum pname, const GLint * params))
+SDL_PROC_UNUSED(void, glTexGend, (GLenum coord, GLenum pname, GLdouble param))
+SDL_PROC_UNUSED(void, glTexGendv,
+                (GLenum coord, GLenum pname, const GLdouble * params))
+SDL_PROC_UNUSED(void, glTexGenf, (GLenum coord, GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glTexGenfv,
+                (GLenum coord, GLenum pname, const GLfloat * params))
+SDL_PROC_UNUSED(void, glTexGeni, (GLenum coord, GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glTexGeniv,
+                (GLenum coord, GLenum pname, const GLint * params))
+SDL_PROC_UNUSED(void, glTexImage1D,
+                (GLenum target, GLint level, GLint internalformat,
+                 GLsizei width, GLint border, GLenum format, GLenum type,
+                 const GLvoid * pixels))
+SDL_PROC(void, glTexImage2D,
+         (GLenum target, GLint level, GLint internalformat, GLsizei width,
+          GLsizei height, GLint border, GLenum format, GLenum type,
+          const GLvoid * pixels))
+SDL_PROC_UNUSED(void, glTexParameterf,
+                (GLenum target, GLenum pname, GLfloat param))
+SDL_PROC_UNUSED(void, glTexParameterfv,
+                (GLenum target, GLenum pname, const GLfloat * params))
+SDL_PROC(void, glTexParameteri, (GLenum target, GLenum pname, GLint param))
+SDL_PROC_UNUSED(void, glTexParameteriv,
+                (GLenum target, GLenum pname, const GLint * params))
+SDL_PROC_UNUSED(void, glTexSubImage1D,
+                (GLenum target, GLint level, GLint xoffset, GLsizei width,
+                 GLenum format, GLenum type, const GLvoid * pixels))
+SDL_PROC(void, glTexSubImage2D,
+         (GLenum target, GLint level, GLint xoffset, GLint yoffset,
+          GLsizei width, GLsizei height, GLenum format, GLenum type,
+          const GLvoid * pixels))
+SDL_PROC_UNUSED(void, glTranslated, (GLdouble x, GLdouble y, GLdouble z))
+SDL_PROC(void, glTranslatef, (GLfloat x, GLfloat y, GLfloat z))
+SDL_PROC_UNUSED(void, glVertex2d, (GLdouble x, GLdouble y))
+SDL_PROC_UNUSED(void, glVertex2dv, (const GLdouble * v))
+SDL_PROC(void, glVertex2f, (GLfloat x, GLfloat y))
+SDL_PROC_UNUSED(void, glVertex2fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glVertex2i, (GLint x, GLint y))
+SDL_PROC_UNUSED(void, glVertex2iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glVertex2s, (GLshort x, GLshort y))
+SDL_PROC_UNUSED(void, glVertex2sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glVertex3d, (GLdouble x, GLdouble y, GLdouble z))
+SDL_PROC_UNUSED(void, glVertex3dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glVertex3f, (GLfloat x, GLfloat y, GLfloat z))
+SDL_PROC(void, glVertex3fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glVertex3i, (GLint x, GLint y, GLint z))
+SDL_PROC_UNUSED(void, glVertex3iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glVertex3s, (GLshort x, GLshort y, GLshort z))
+SDL_PROC_UNUSED(void, glVertex3sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glVertex4d,
+                (GLdouble x, GLdouble y, GLdouble z, GLdouble w))
+SDL_PROC_UNUSED(void, glVertex4dv, (const GLdouble * v))
+SDL_PROC_UNUSED(void, glVertex4f,
+                (GLfloat x, GLfloat y, GLfloat z, GLfloat w))
+SDL_PROC_UNUSED(void, glVertex4fv, (const GLfloat * v))
+SDL_PROC_UNUSED(void, glVertex4i, (GLint x, GLint y, GLint z, GLint w))
+SDL_PROC_UNUSED(void, glVertex4iv, (const GLint * v))
+SDL_PROC_UNUSED(void, glVertex4s,
+                (GLshort x, GLshort y, GLshort z, GLshort w))
+SDL_PROC_UNUSED(void, glVertex4sv, (const GLshort * v))
+SDL_PROC_UNUSED(void, glVertexPointer,
+                (GLint size, GLenum type, GLsizei stride,
+                 const GLvoid * pointer))
+SDL_PROC(void, glViewport, (GLint x, GLint y, GLsizei width, GLsizei height))
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/opengl/SDL_shaders_gl.c

@@ -0,0 +1,542 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED
+
+#include "SDL_stdinc.h"
+#include "SDL_log.h"
+#include "SDL_opengl.h"
+#include "SDL_video.h"
+#include "SDL_shaders_gl.h"
+
+/* OpenGL shader implementation */
+
+/* #define DEBUG_SHADERS */
+
+typedef struct
+{
+    GLhandleARB program;
+    GLhandleARB vert_shader;
+    GLhandleARB frag_shader;
+} GL_ShaderData;
+
+struct GL_ShaderContext
+{
+    GLenum (*glGetError)(void);
+
+    PFNGLATTACHOBJECTARBPROC glAttachObjectARB;
+    PFNGLCOMPILESHADERARBPROC glCompileShaderARB;
+    PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB;
+    PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB;
+    PFNGLDELETEOBJECTARBPROC glDeleteObjectARB;
+    PFNGLGETINFOLOGARBPROC glGetInfoLogARB;
+    PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB;
+    PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB;
+    PFNGLLINKPROGRAMARBPROC glLinkProgramARB;
+    PFNGLSHADERSOURCEARBPROC glShaderSourceARB;
+    PFNGLUNIFORM1IARBPROC glUniform1iARB;
+    PFNGLUNIFORM1FARBPROC glUniform1fARB;
+    PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB;
+
+    SDL_bool GL_ARB_texture_rectangle_supported;
+
+    GL_ShaderData shaders[NUM_SHADERS];
+};
+
+#define COLOR_VERTEX_SHADER                                     \
+"varying vec4 v_color;\n"                                       \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" \
+"    v_color = gl_Color;\n"                                     \
+"}"                                                             \
+
+#define TEXTURE_VERTEX_SHADER                                   \
+"varying vec4 v_color;\n"                                       \
+"varying vec2 v_texCoord;\n"                                    \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" \
+"    v_color = gl_Color;\n"                                     \
+"    v_texCoord = vec2(gl_MultiTexCoord0);\n"                   \
+"}"                                                             \
+
+#define JPEG_SHADER_CONSTANTS                                   \
+"// YUV offset \n"                                              \
+"const vec3 offset = vec3(0, -0.501960814, -0.501960814);\n"    \
+"\n"                                                            \
+"// RGB coefficients \n"                                        \
+"const vec3 Rcoeff = vec3(1,  0.000,  1.402);\n"                \
+"const vec3 Gcoeff = vec3(1, -0.3441, -0.7141);\n"              \
+"const vec3 Bcoeff = vec3(1,  1.772,  0.000);\n"                \
+
+#define BT601_SHADER_CONSTANTS                                  \
+"// YUV offset \n"                                              \
+"const vec3 offset = vec3(-0.0627451017, -0.501960814, -0.501960814);\n" \
+"\n"                                                            \
+"// RGB coefficients \n"                                        \
+"const vec3 Rcoeff = vec3(1.1644,  0.000,  1.596);\n"           \
+"const vec3 Gcoeff = vec3(1.1644, -0.3918, -0.813);\n"          \
+"const vec3 Bcoeff = vec3(1.1644,  2.0172,  0.000);\n"          \
+
+#define BT709_SHADER_CONSTANTS                                  \
+"// YUV offset \n"                                              \
+"const vec3 offset = vec3(-0.0627451017, -0.501960814, -0.501960814);\n" \
+"\n"                                                            \
+"// RGB coefficients \n"                                        \
+"const vec3 Rcoeff = vec3(1.1644,  0.000,  1.7927);\n"          \
+"const vec3 Gcoeff = vec3(1.1644, -0.2132, -0.5329);\n"         \
+"const vec3 Bcoeff = vec3(1.1644,  2.1124,  0.000);\n"          \
+
+#define YUV_SHADER_PROLOGUE                                     \
+"varying vec4 v_color;\n"                                       \
+"varying vec2 v_texCoord;\n"                                    \
+"uniform sampler2D tex0; // Y \n"                               \
+"uniform sampler2D tex1; // U \n"                               \
+"uniform sampler2D tex2; // V \n"                               \
+"\n"                                                            \
+
+#define YUV_SHADER_BODY                                         \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    vec2 tcoord;\n"                                            \
+"    vec3 yuv, rgb;\n"                                          \
+"\n"                                                            \
+"    // Get the Y value \n"                                     \
+"    tcoord = v_texCoord;\n"                                    \
+"    yuv.x = texture2D(tex0, tcoord).r;\n"                      \
+"\n"                                                            \
+"    // Get the U and V values \n"                              \
+"    tcoord *= UVCoordScale;\n"                                 \
+"    yuv.y = texture2D(tex1, tcoord).r;\n"                      \
+"    yuv.z = texture2D(tex2, tcoord).r;\n"                      \
+"\n"                                                            \
+"    // Do the color transform \n"                              \
+"    yuv += offset;\n"                                          \
+"    rgb.r = dot(yuv, Rcoeff);\n"                               \
+"    rgb.g = dot(yuv, Gcoeff);\n"                               \
+"    rgb.b = dot(yuv, Bcoeff);\n"                               \
+"\n"                                                            \
+"    // That was easy. :) \n"                                   \
+"    gl_FragColor = vec4(rgb, 1.0) * v_color;\n"                \
+"}"                                                             \
+
+#define NV12_SHADER_PROLOGUE                                    \
+"varying vec4 v_color;\n"                                       \
+"varying vec2 v_texCoord;\n"                                    \
+"uniform sampler2D tex0; // Y \n"                               \
+"uniform sampler2D tex1; // U/V \n"                             \
+"\n"                                                            \
+
+#define NV12_SHADER_BODY                                        \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    vec2 tcoord;\n"                                            \
+"    vec3 yuv, rgb;\n"                                          \
+"\n"                                                            \
+"    // Get the Y value \n"                                     \
+"    tcoord = v_texCoord;\n"                                    \
+"    yuv.x = texture2D(tex0, tcoord).r;\n"                      \
+"\n"                                                            \
+"    // Get the U and V values \n"                              \
+"    tcoord *= UVCoordScale;\n"                                 \
+"    yuv.yz = texture2D(tex1, tcoord).ra;\n"                    \
+"\n"                                                            \
+"    // Do the color transform \n"                              \
+"    yuv += offset;\n"                                          \
+"    rgb.r = dot(yuv, Rcoeff);\n"                               \
+"    rgb.g = dot(yuv, Gcoeff);\n"                               \
+"    rgb.b = dot(yuv, Bcoeff);\n"                               \
+"\n"                                                            \
+"    // That was easy. :) \n"                                   \
+"    gl_FragColor = vec4(rgb, 1.0) * v_color;\n"                \
+"}"                                                             \
+
+#define NV21_SHADER_PROLOGUE                                    \
+"varying vec4 v_color;\n"                                       \
+"varying vec2 v_texCoord;\n"                                    \
+"uniform sampler2D tex0; // Y \n"                               \
+"uniform sampler2D tex1; // U/V \n"                             \
+"\n"                                                            \
+
+#define NV21_SHADER_BODY                                        \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    vec2 tcoord;\n"                                            \
+"    vec3 yuv, rgb;\n"                                          \
+"\n"                                                            \
+"    // Get the Y value \n"                                     \
+"    tcoord = v_texCoord;\n"                                    \
+"    yuv.x = texture2D(tex0, tcoord).r;\n"                      \
+"\n"                                                            \
+"    // Get the U and V values \n"                              \
+"    tcoord *= UVCoordScale;\n"                                 \
+"    yuv.yz = texture2D(tex1, tcoord).ar;\n"                    \
+"\n"                                                            \
+"    // Do the color transform \n"                              \
+"    yuv += offset;\n"                                          \
+"    rgb.r = dot(yuv, Rcoeff);\n"                               \
+"    rgb.g = dot(yuv, Gcoeff);\n"                               \
+"    rgb.b = dot(yuv, Bcoeff);\n"                               \
+"\n"                                                            \
+"    // That was easy. :) \n"                                   \
+"    gl_FragColor = vec4(rgb, 1.0) * v_color;\n"                \
+"}"                                                             \
+
+/*
+ * NOTE: Always use sampler2D, etc here. We'll #define them to the
+ *  texture_rectangle versions if we choose to use that extension.
+ */
+static const char *shader_source[NUM_SHADERS][2] =
+{
+    /* SHADER_NONE */
+    { NULL, NULL },
+
+    /* SHADER_SOLID */
+    {
+        /* vertex shader */
+        COLOR_VERTEX_SHADER,
+        /* fragment shader */
+"varying vec4 v_color;\n"
+"\n"
+"void main()\n"
+"{\n"
+"    gl_FragColor = v_color;\n"
+"}"
+    },
+
+    /* SHADER_RGB */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+"varying vec4 v_color;\n"
+"varying vec2 v_texCoord;\n"
+"uniform sampler2D tex0;\n"
+"\n"
+"void main()\n"
+"{\n"
+"    gl_FragColor = texture2D(tex0, v_texCoord);\n"
+"    gl_FragColor.a = 1.0;\n"
+"    gl_FragColor *= v_color;\n"
+"}"
+    },
+
+    /* SHADER_RGBA */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+"varying vec4 v_color;\n"
+"varying vec2 v_texCoord;\n"
+"uniform sampler2D tex0;\n"
+"\n"
+"void main()\n"
+"{\n"
+"    gl_FragColor = texture2D(tex0, v_texCoord) * v_color;\n"
+"}"
+    },
+
+    /* SHADER_YUV_JPEG */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        YUV_SHADER_PROLOGUE
+        JPEG_SHADER_CONSTANTS
+        YUV_SHADER_BODY
+    },
+    /* SHADER_YUV_BT601 */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        YUV_SHADER_PROLOGUE
+        BT601_SHADER_CONSTANTS
+        YUV_SHADER_BODY
+    },
+    /* SHADER_YUV_BT709 */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        YUV_SHADER_PROLOGUE
+        BT709_SHADER_CONSTANTS
+        YUV_SHADER_BODY
+    },
+    /* SHADER_NV12_JPEG */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        NV12_SHADER_PROLOGUE
+        JPEG_SHADER_CONSTANTS
+        NV12_SHADER_BODY
+    },
+    /* SHADER_NV12_BT601 */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        NV12_SHADER_PROLOGUE
+        BT601_SHADER_CONSTANTS
+        NV12_SHADER_BODY
+    },
+    /* SHADER_NV12_BT709 */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        NV12_SHADER_PROLOGUE
+        BT709_SHADER_CONSTANTS
+        NV12_SHADER_BODY
+    },
+    /* SHADER_NV21_JPEG */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        NV21_SHADER_PROLOGUE
+        JPEG_SHADER_CONSTANTS
+        NV21_SHADER_BODY
+    },
+    /* SHADER_NV21_BT601 */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        NV21_SHADER_PROLOGUE
+        BT601_SHADER_CONSTANTS
+        NV21_SHADER_BODY
+    },
+    /* SHADER_NV21_BT709 */
+    {
+        /* vertex shader */
+        TEXTURE_VERTEX_SHADER,
+        /* fragment shader */
+        NV21_SHADER_PROLOGUE
+        BT709_SHADER_CONSTANTS
+        NV21_SHADER_BODY
+    },
+};
+
+static SDL_bool
+CompileShader(GL_ShaderContext *ctx, GLhandleARB shader, const char *defines, const char *source)
+{
+    GLint status;
+    const char *sources[2];
+
+    sources[0] = defines;
+    sources[1] = source;
+
+    ctx->glShaderSourceARB(shader, SDL_arraysize(sources), sources, NULL);
+    ctx->glCompileShaderARB(shader);
+    ctx->glGetObjectParameterivARB(shader, GL_OBJECT_COMPILE_STATUS_ARB, &status);
+    if (status == 0) {
+        SDL_bool isstack;
+        GLint length;
+        char *info;
+
+        ctx->glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
+        info = SDL_small_alloc(char, length+1, &isstack);
+        ctx->glGetInfoLogARB(shader, length, NULL, info);
+        SDL_LogError(SDL_LOG_CATEGORY_RENDER,
+            "Failed to compile shader:\n%s%s\n%s", defines, source, info);
+#ifdef DEBUG_SHADERS
+        fprintf(stderr,
+            "Failed to compile shader:\n%s%s\n%s", defines, source, info);
+#endif
+        SDL_small_free(info, isstack);
+
+        return SDL_FALSE;
+    } else {
+        return SDL_TRUE;
+    }
+}
+
+static SDL_bool
+CompileShaderProgram(GL_ShaderContext *ctx, int index, GL_ShaderData *data)
+{
+    const int num_tmus_bound = 4;
+    const char *vert_defines = "";
+    const char *frag_defines = "";
+    int i;
+    GLint location;
+
+    if (index == SHADER_NONE) {
+        return SDL_TRUE;
+    }
+
+    ctx->glGetError();
+
+    /* Make sure we use the correct sampler type for our texture type */
+    if (ctx->GL_ARB_texture_rectangle_supported) {
+        frag_defines =
+"#define sampler2D sampler2DRect\n"
+"#define texture2D texture2DRect\n"
+"#define UVCoordScale 0.5\n";
+    } else {
+        frag_defines = 
+"#define UVCoordScale 1.0\n";
+    }
+
+    /* Create one program object to rule them all */
+    data->program = ctx->glCreateProgramObjectARB();
+
+    /* Create the vertex shader */
+    data->vert_shader = ctx->glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
+    if (!CompileShader(ctx, data->vert_shader, vert_defines, shader_source[index][0])) {
+        return SDL_FALSE;
+    }
+
+    /* Create the fragment shader */
+    data->frag_shader = ctx->glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
+    if (!CompileShader(ctx, data->frag_shader, frag_defines, shader_source[index][1])) {
+        return SDL_FALSE;
+    }
+
+    /* ... and in the darkness bind them */
+    ctx->glAttachObjectARB(data->program, data->vert_shader);
+    ctx->glAttachObjectARB(data->program, data->frag_shader);
+    ctx->glLinkProgramARB(data->program);
+
+    /* Set up some uniform variables */
+    ctx->glUseProgramObjectARB(data->program);
+    for (i = 0; i < num_tmus_bound; ++i) {
+        char tex_name[10];
+        SDL_snprintf(tex_name, SDL_arraysize(tex_name), "tex%d", i);
+        location = ctx->glGetUniformLocationARB(data->program, tex_name);
+        if (location >= 0) {
+            ctx->glUniform1iARB(location, i);
+        }
+    }
+    ctx->glUseProgramObjectARB(0);
+
+    return (ctx->glGetError() == GL_NO_ERROR);
+}
+
+static void
+DestroyShaderProgram(GL_ShaderContext *ctx, GL_ShaderData *data)
+{
+    ctx->glDeleteObjectARB(data->vert_shader);
+    ctx->glDeleteObjectARB(data->frag_shader);
+    ctx->glDeleteObjectARB(data->program);
+}
+
+GL_ShaderContext *
+GL_CreateShaderContext(void)
+{
+    GL_ShaderContext *ctx;
+    SDL_bool shaders_supported;
+    int i;
+
+    ctx = (GL_ShaderContext *)SDL_calloc(1, sizeof(*ctx));
+    if (!ctx) {
+        return NULL;
+    }
+
+    if (!SDL_GL_ExtensionSupported("GL_ARB_texture_non_power_of_two") &&
+        (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle") ||
+         SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle"))) {
+        ctx->GL_ARB_texture_rectangle_supported = SDL_TRUE;
+    }
+
+    /* Check for shader support */
+    shaders_supported = SDL_FALSE;
+    if (SDL_GL_ExtensionSupported("GL_ARB_shader_objects") &&
+        SDL_GL_ExtensionSupported("GL_ARB_shading_language_100") &&
+        SDL_GL_ExtensionSupported("GL_ARB_vertex_shader") &&
+        SDL_GL_ExtensionSupported("GL_ARB_fragment_shader")) {
+        ctx->glGetError = (GLenum (*)(void)) SDL_GL_GetProcAddress("glGetError");
+        ctx->glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) SDL_GL_GetProcAddress("glAttachObjectARB");
+        ctx->glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) SDL_GL_GetProcAddress("glCompileShaderARB");
+        ctx->glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glCreateProgramObjectARB");
+        ctx->glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) SDL_GL_GetProcAddress("glCreateShaderObjectARB");
+        ctx->glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) SDL_GL_GetProcAddress("glDeleteObjectARB");
+        ctx->glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) SDL_GL_GetProcAddress("glGetInfoLogARB");
+        ctx->glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) SDL_GL_GetProcAddress("glGetObjectParameterivARB");
+        ctx->glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) SDL_GL_GetProcAddress("glGetUniformLocationARB");
+        ctx->glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) SDL_GL_GetProcAddress("glLinkProgramARB");
+        ctx->glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) SDL_GL_GetProcAddress("glShaderSourceARB");
+        ctx->glUniform1iARB = (PFNGLUNIFORM1IARBPROC) SDL_GL_GetProcAddress("glUniform1iARB");
+        ctx->glUniform1fARB = (PFNGLUNIFORM1FARBPROC) SDL_GL_GetProcAddress("glUniform1fARB");
+        ctx->glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glUseProgramObjectARB");
+        if (ctx->glGetError &&
+            ctx->glAttachObjectARB &&
+            ctx->glCompileShaderARB &&
+            ctx->glCreateProgramObjectARB &&
+            ctx->glCreateShaderObjectARB &&
+            ctx->glDeleteObjectARB &&
+            ctx->glGetInfoLogARB &&
+            ctx->glGetObjectParameterivARB &&
+            ctx->glGetUniformLocationARB &&
+            ctx->glLinkProgramARB &&
+            ctx->glShaderSourceARB &&
+            ctx->glUniform1iARB &&
+            ctx->glUniform1fARB &&
+            ctx->glUseProgramObjectARB) {
+            shaders_supported = SDL_TRUE;
+        }
+    }
+
+    if (!shaders_supported) {
+        SDL_free(ctx);
+        return NULL;
+    }
+
+    /* Compile all the shaders */
+    for (i = 0; i < NUM_SHADERS; ++i) {
+        if (!CompileShaderProgram(ctx, i, &ctx->shaders[i])) {
+            GL_DestroyShaderContext(ctx);
+            return NULL;
+        }
+    }
+
+    /* We're done! */
+    return ctx;
+}
+
+void
+GL_SelectShader(GL_ShaderContext *ctx, GL_Shader shader)
+{
+    ctx->glUseProgramObjectARB(ctx->shaders[shader].program);
+}
+
+void
+GL_DestroyShaderContext(GL_ShaderContext *ctx)
+{
+    int i;
+
+    for (i = 0; i < NUM_SHADERS; ++i) {
+        DestroyShaderProgram(ctx, &ctx->shaders[i]);
+    }
+    SDL_free(ctx);
+}
+
+#endif /* SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/opengl/SDL_shaders_gl.h

@@ -0,0 +1,55 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_shaders_gl_h_
+#define SDL_shaders_gl_h_
+
+#include "../../SDL_internal.h"
+
+/* OpenGL shader implementation */
+
+typedef enum {
+    SHADER_INVALID = -1,
+    SHADER_NONE,
+    SHADER_SOLID,
+    SHADER_RGB,
+    SHADER_RGBA,
+    SHADER_YUV_JPEG,
+    SHADER_YUV_BT601,
+    SHADER_YUV_BT709,
+    SHADER_NV12_JPEG,
+    SHADER_NV12_BT601,
+    SHADER_NV12_BT709,
+    SHADER_NV21_JPEG,
+    SHADER_NV21_BT601,
+    SHADER_NV21_BT709,
+    NUM_SHADERS
+} GL_Shader;
+
+typedef struct GL_ShaderContext GL_ShaderContext;
+
+extern GL_ShaderContext * GL_CreateShaderContext(void);
+extern void GL_SelectShader(GL_ShaderContext *ctx, GL_Shader shader);
+extern void GL_DestroyShaderContext(GL_ShaderContext *ctx);
+
+#endif /* SDL_shaders_gl_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/opengles/SDL_glesfuncs.h

@@ -0,0 +1,65 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+SDL_PROC(void, glBindTexture, (GLenum, GLuint))
+SDL_PROC(void, glBlendFunc, (GLenum, GLenum))
+SDL_PROC_OES(void, glBlendEquationOES, (GLenum))
+SDL_PROC_OES(void, glBlendEquationSeparateOES, (GLenum, GLenum))
+SDL_PROC_OES(void, glBlendFuncSeparateOES, (GLenum, GLenum, GLenum, GLenum))
+SDL_PROC(void, glClear, (GLbitfield))
+SDL_PROC(void, glClearColor, (GLclampf, GLclampf, GLclampf, GLclampf))
+SDL_PROC(void, glColor4f, (GLfloat, GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glDeleteTextures, (GLsizei, const GLuint *))
+SDL_PROC(void, glDisable, (GLenum))
+SDL_PROC(void, glDisableClientState, (GLenum array))
+SDL_PROC(void, glDrawArrays, (GLenum, GLint, GLsizei))
+SDL_PROC_OES(void, glDrawTexfOES, (GLfloat, GLfloat, GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glEnable, (GLenum))
+SDL_PROC(void, glEnableClientState, (GLenum))
+SDL_PROC(void, glFinish, (void))
+SDL_PROC_OES(void, glGenFramebuffersOES, (GLsizei, GLuint *))
+SDL_PROC(void, glGenTextures, (GLsizei, GLuint *))
+SDL_PROC(GLenum, glGetError, (void))
+SDL_PROC(void, glGetIntegerv, (GLenum, GLint *))
+SDL_PROC(void, glLoadIdentity, (void))
+SDL_PROC(void, glMatrixMode, (GLenum))
+SDL_PROC(void, glOrthof, (GLfloat, GLfloat, GLfloat, GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glPixelStorei, (GLenum, GLint))
+SDL_PROC(void, glReadPixels, (GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLvoid*))
+SDL_PROC(void, glScissor, (GLint, GLint, GLsizei, GLsizei))
+SDL_PROC(void, glTexCoordPointer, (GLint, GLenum, GLsizei, const GLvoid *))
+SDL_PROC(void, glTexEnvf, (GLenum, GLenum, GLfloat))
+SDL_PROC(void, glTexImage2D, (GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid *))
+SDL_PROC(void, glTexParameteri, (GLenum, GLenum, GLint))
+SDL_PROC(void, glTexParameteriv, (GLenum, GLenum, const GLint *))
+SDL_PROC(void, glTexSubImage2D, (GLenum, GLint, GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, const GLvoid *))
+SDL_PROC(void, glVertexPointer, (GLint, GLenum, GLsizei, const GLvoid *))
+SDL_PROC(void, glViewport, (GLint, GLint, GLsizei, GLsizei))
+SDL_PROC_OES(void, glBindFramebufferOES, (GLenum, GLuint))
+SDL_PROC_OES(void, glFramebufferTexture2DOES, (GLenum, GLenum, GLenum, GLuint, GLint))
+SDL_PROC_OES(GLenum, glCheckFramebufferStatusOES, (GLenum))
+SDL_PROC(void, glPushMatrix, (void))
+SDL_PROC(void, glTranslatef, (GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glRotatef, (GLfloat, GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glPopMatrix, (void))
+SDL_PROC_OES(void, glDeleteFramebuffersOES, (GLsizei, const GLuint*))
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/opengles2/SDL_gles2funcs.h

@@ -0,0 +1,81 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+SDL_PROC(void, glActiveTexture, (GLenum))
+SDL_PROC(void, glAttachShader, (GLuint, GLuint))
+SDL_PROC(void, glBindAttribLocation, (GLuint, GLuint, const char *))
+SDL_PROC(void, glBindTexture, (GLenum, GLuint))
+SDL_PROC(void, glBlendEquationSeparate, (GLenum, GLenum))
+SDL_PROC(void, glBlendFuncSeparate, (GLenum, GLenum, GLenum, GLenum))
+SDL_PROC(void, glClear, (GLbitfield))
+SDL_PROC(void, glClearColor, (GLclampf, GLclampf, GLclampf, GLclampf))
+SDL_PROC(void, glCompileShader, (GLuint))
+SDL_PROC(GLuint, glCreateProgram, (void))
+SDL_PROC(GLuint, glCreateShader, (GLenum))
+SDL_PROC(void, glDeleteProgram, (GLuint))
+SDL_PROC(void, glDeleteShader, (GLuint))
+SDL_PROC(void, glDeleteTextures, (GLsizei, const GLuint *))
+SDL_PROC(void, glDisable, (GLenum))
+SDL_PROC(void, glDisableVertexAttribArray, (GLuint))
+SDL_PROC(void, glDrawArrays, (GLenum, GLint, GLsizei))
+SDL_PROC(void, glEnable, (GLenum))
+SDL_PROC(void, glEnableVertexAttribArray, (GLuint))
+SDL_PROC(void, glFinish, (void))
+SDL_PROC(void, glGenFramebuffers, (GLsizei, GLuint *))
+SDL_PROC(void, glGenTextures, (GLsizei, GLuint *))
+SDL_PROC(void, glGetBooleanv, (GLenum, GLboolean *))
+SDL_PROC(const GLubyte *, glGetString, (GLenum))
+SDL_PROC(GLenum, glGetError, (void))
+SDL_PROC(void, glGetIntegerv, (GLenum, GLint *))
+SDL_PROC(void, glGetProgramiv, (GLuint, GLenum, GLint *))
+SDL_PROC(void, glGetShaderInfoLog, (GLuint, GLsizei, GLsizei *, char *))
+SDL_PROC(void, glGetShaderiv, (GLuint, GLenum, GLint *))
+SDL_PROC(GLint, glGetUniformLocation, (GLuint, const char *))
+SDL_PROC(void, glLinkProgram, (GLuint))
+SDL_PROC(void, glPixelStorei, (GLenum, GLint))
+SDL_PROC(void, glReadPixels, (GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLvoid*))
+SDL_PROC(void, glScissor, (GLint, GLint, GLsizei, GLsizei))
+SDL_PROC(void, glShaderBinary, (GLsizei, const GLuint *, GLenum, const void *, GLsizei))
+#if __NACL__
+SDL_PROC(void, glShaderSource, (GLuint, GLsizei, const GLchar **, const GLint *))
+#else
+SDL_PROC(void, glShaderSource, (GLuint, GLsizei, const GLchar* const*, const GLint *))
+#endif
+SDL_PROC(void, glTexImage2D, (GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const void *))
+SDL_PROC(void, glTexParameteri, (GLenum, GLenum, GLint))
+SDL_PROC(void, glTexSubImage2D, (GLenum, GLint, GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, const GLvoid *))
+SDL_PROC(void, glUniform1i, (GLint, GLint))
+SDL_PROC(void, glUniform4f, (GLint, GLfloat, GLfloat, GLfloat, GLfloat))
+SDL_PROC(void, glUniformMatrix4fv, (GLint, GLsizei, GLboolean, const GLfloat *))
+SDL_PROC(void, glUseProgram, (GLuint))
+SDL_PROC(void, glVertexAttribPointer, (GLuint, GLint, GLenum, GLboolean, GLsizei, const void *))
+SDL_PROC(void, glViewport, (GLint, GLint, GLsizei, GLsizei))
+SDL_PROC(void, glBindFramebuffer, (GLenum, GLuint))
+SDL_PROC(void, glFramebufferTexture2D, (GLenum, GLenum, GLenum, GLuint, GLint))
+SDL_PROC(GLenum, glCheckFramebufferStatus, (GLenum))
+SDL_PROC(void, glDeleteFramebuffers, (GLsizei, const GLuint *))
+SDL_PROC(GLint, glGetAttribLocation, (GLuint, const GLchar *))
+SDL_PROC(void, glGetProgramInfoLog, (GLuint, GLsizei, GLsizei*, GLchar*))
+SDL_PROC(void, glGenBuffers, (GLsizei, GLuint *))
+SDL_PROC(void, glDeleteBuffers, (GLsizei, const GLuint *))
+SDL_PROC(void, glBindBuffer, (GLenum, GLuint))
+SDL_PROC(void, glBufferData, (GLenum, GLsizeiptr, const GLvoid *, GLenum))
+SDL_PROC(void, glBufferSubData, (GLenum, GLintptr, GLsizeiptr, const GLvoid *))

externals/SDL/src/render/opengles2/SDL_shaders_gles2.c

@@ -0,0 +1,573 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_OGL_ES2 && !SDL_RENDER_DISABLED
+
+#include "SDL_video.h"
+#include "SDL_opengles2.h"
+#include "SDL_shaders_gles2.h"
+#include "SDL_stdinc.h"
+
+/*************************************************************************************************
+ * Vertex/fragment shader source                                                                 *
+ *************************************************************************************************/
+/* Notes on a_angle:
+   * It is a vector containing sin and cos for rotation matrix
+   * To get correct rotation for most cases when a_angle is disabled cos
+     value is decremented by 1.0 to get proper output with 0.0 which is
+     default value
+*/
+static const Uint8 GLES2_VertexSrc_Default_[] = " \
+    uniform mat4 u_projection; \
+    attribute vec2 a_position; \
+    attribute vec2 a_texCoord; \
+    attribute vec2 a_angle; \
+    attribute vec2 a_center; \
+    varying vec2 v_texCoord; \
+    \
+    void main() \
+    { \
+        float s = a_angle[0]; \
+        float c = a_angle[1] + 1.0; \
+        mat2 rotationMatrix = mat2(c, -s, s, c); \
+        vec2 position = rotationMatrix * (a_position - a_center) + a_center; \
+        v_texCoord = a_texCoord; \
+        gl_Position = u_projection * vec4(position, 0.0, 1.0);\
+        gl_PointSize = 1.0; \
+    } \
+";
+
+static const Uint8 GLES2_FragmentSrc_SolidSrc_[] = " \
+    precision mediump float; \
+    uniform vec4 u_color; \
+    \
+    void main() \
+    { \
+        gl_FragColor = u_color; \
+    } \
+";
+
+static const Uint8 GLES2_FragmentSrc_TextureABGRSrc_[] = " \
+    precision mediump float; \
+    uniform sampler2D u_texture; \
+    uniform vec4 u_color; \
+    varying vec2 v_texCoord; \
+    \
+    void main() \
+    { \
+        gl_FragColor = texture2D(u_texture, v_texCoord); \
+        gl_FragColor *= u_color; \
+    } \
+";
+
+/* ARGB to ABGR conversion */
+static const Uint8 GLES2_FragmentSrc_TextureARGBSrc_[] = " \
+    precision mediump float; \
+    uniform sampler2D u_texture; \
+    uniform vec4 u_color; \
+    varying vec2 v_texCoord; \
+    \
+    void main() \
+    { \
+        vec4 abgr = texture2D(u_texture, v_texCoord); \
+        gl_FragColor = abgr; \
+        gl_FragColor.r = abgr.b; \
+        gl_FragColor.b = abgr.r; \
+        gl_FragColor *= u_color; \
+    } \
+";
+
+/* RGB to ABGR conversion */
+static const Uint8 GLES2_FragmentSrc_TextureRGBSrc_[] = " \
+    precision mediump float; \
+    uniform sampler2D u_texture; \
+    uniform vec4 u_color; \
+    varying vec2 v_texCoord; \
+    \
+    void main() \
+    { \
+        vec4 abgr = texture2D(u_texture, v_texCoord); \
+        gl_FragColor = abgr; \
+        gl_FragColor.r = abgr.b; \
+        gl_FragColor.b = abgr.r; \
+        gl_FragColor.a = 1.0; \
+        gl_FragColor *= u_color; \
+    } \
+";
+
+/* BGR to ABGR conversion */
+static const Uint8 GLES2_FragmentSrc_TextureBGRSrc_[] = " \
+    precision mediump float; \
+    uniform sampler2D u_texture; \
+    uniform vec4 u_color; \
+    varying vec2 v_texCoord; \
+    \
+    void main() \
+    { \
+        vec4 abgr = texture2D(u_texture, v_texCoord); \
+        gl_FragColor = abgr; \
+        gl_FragColor.a = 1.0; \
+        gl_FragColor *= u_color; \
+    } \
+";
+
+#define JPEG_SHADER_CONSTANTS                                   \
+"// YUV offset \n"                                              \
+"const vec3 offset = vec3(0, -0.501960814, -0.501960814);\n"    \
+"\n"                                                            \
+"// RGB coefficients \n"                                        \
+"const mat3 matrix = mat3( 1,       1,        1,\n"             \
+"                          0,      -0.3441,   1.772,\n"         \
+"                          1.402,  -0.7141,   0);\n"            \
+
+#define BT601_SHADER_CONSTANTS                                  \
+"// YUV offset \n"                                              \
+"const vec3 offset = vec3(-0.0627451017, -0.501960814, -0.501960814);\n" \
+"\n"                                                            \
+"// RGB coefficients \n"                                        \
+"const mat3 matrix = mat3( 1.1644,  1.1644,   1.1644,\n"        \
+"                          0,      -0.3918,   2.0172,\n"        \
+"                          1.596,  -0.813,    0);\n"            \
+
+#define BT709_SHADER_CONSTANTS                                  \
+"// YUV offset \n"                                              \
+"const vec3 offset = vec3(-0.0627451017, -0.501960814, -0.501960814);\n" \
+"\n"                                                            \
+"// RGB coefficients \n"                                        \
+"const mat3 matrix = mat3( 1.1644,  1.1644,   1.1644,\n"        \
+"                          0,      -0.2132,   2.1124,\n"        \
+"                          1.7927, -0.5329,   0);\n"            \
+
+
+#define YUV_SHADER_PROLOGUE                                     \
+"precision mediump float;\n"                                    \
+"uniform sampler2D u_texture;\n"                                \
+"uniform sampler2D u_texture_u;\n"                              \
+"uniform sampler2D u_texture_v;\n"                              \
+"uniform vec4 u_color;\n"                                  \
+"varying vec2 v_texCoord;\n"                                    \
+"\n"                                                            \
+
+#define YUV_SHADER_BODY                                         \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    mediump vec3 yuv;\n"                                       \
+"    lowp vec3 rgb;\n"                                          \
+"\n"                                                            \
+"    // Get the YUV values \n"                                  \
+"    yuv.x = texture2D(u_texture,   v_texCoord).r;\n"           \
+"    yuv.y = texture2D(u_texture_u, v_texCoord).r;\n"           \
+"    yuv.z = texture2D(u_texture_v, v_texCoord).r;\n"           \
+"\n"                                                            \
+"    // Do the color transform \n"                              \
+"    yuv += offset;\n"                                          \
+"    rgb = matrix * yuv;\n"                                     \
+"\n"                                                            \
+"    // That was easy. :) \n"                                   \
+"    gl_FragColor = vec4(rgb, 1);\n"                            \
+"    gl_FragColor *= u_color;\n"                           \
+"}"                                                             \
+
+#define NV12_SHADER_BODY                                        \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    mediump vec3 yuv;\n"                                       \
+"    lowp vec3 rgb;\n"                                          \
+"\n"                                                            \
+"    // Get the YUV values \n"                                  \
+"    yuv.x = texture2D(u_texture,   v_texCoord).r;\n"           \
+"    yuv.yz = texture2D(u_texture_u, v_texCoord).ra;\n"         \
+"\n"                                                            \
+"    // Do the color transform \n"                              \
+"    yuv += offset;\n"                                          \
+"    rgb = matrix * yuv;\n"                                     \
+"\n"                                                            \
+"    // That was easy. :) \n"                                   \
+"    gl_FragColor = vec4(rgb, 1);\n"                            \
+"    gl_FragColor *= u_color;\n"                           \
+"}"                                                             \
+
+#define NV21_SHADER_BODY                                        \
+"\n"                                                            \
+"void main()\n"                                                 \
+"{\n"                                                           \
+"    mediump vec3 yuv;\n"                                       \
+"    lowp vec3 rgb;\n"                                          \
+"\n"                                                            \
+"    // Get the YUV values \n"                                  \
+"    yuv.x = texture2D(u_texture,   v_texCoord).r;\n"           \
+"    yuv.yz = texture2D(u_texture_u, v_texCoord).ar;\n"         \
+"\n"                                                            \
+"    // Do the color transform \n"                              \
+"    yuv += offset;\n"                                          \
+"    rgb = matrix * yuv;\n"                                     \
+"\n"                                                            \
+"    // That was easy. :) \n"                                   \
+"    gl_FragColor = vec4(rgb, 1);\n"                            \
+"    gl_FragColor *= u_color;\n"                           \
+"}"                                                             \
+
+/* YUV to ABGR conversion */
+static const Uint8 GLES2_FragmentSrc_TextureYUVJPEGSrc_[] = \
+        YUV_SHADER_PROLOGUE \
+        JPEG_SHADER_CONSTANTS \
+        YUV_SHADER_BODY \
+;
+static const Uint8 GLES2_FragmentSrc_TextureYUVBT601Src_[] = \
+        YUV_SHADER_PROLOGUE \
+        BT601_SHADER_CONSTANTS \
+        YUV_SHADER_BODY \
+;
+static const Uint8 GLES2_FragmentSrc_TextureYUVBT709Src_[] = \
+        YUV_SHADER_PROLOGUE \
+        BT709_SHADER_CONSTANTS \
+        YUV_SHADER_BODY \
+;
+
+/* NV12 to ABGR conversion */
+static const Uint8 GLES2_FragmentSrc_TextureNV12JPEGSrc_[] = \
+        YUV_SHADER_PROLOGUE \
+        JPEG_SHADER_CONSTANTS \
+        NV12_SHADER_BODY \
+;
+static const Uint8 GLES2_FragmentSrc_TextureNV12BT601Src_[] = \
+        YUV_SHADER_PROLOGUE \
+        BT601_SHADER_CONSTANTS \
+        NV12_SHADER_BODY \
+;
+static const Uint8 GLES2_FragmentSrc_TextureNV12BT709Src_[] = \
+        YUV_SHADER_PROLOGUE \
+        BT709_SHADER_CONSTANTS \
+        NV12_SHADER_BODY \
+;
+
+/* NV21 to ABGR conversion */
+static const Uint8 GLES2_FragmentSrc_TextureNV21JPEGSrc_[] = \
+        YUV_SHADER_PROLOGUE \
+        JPEG_SHADER_CONSTANTS \
+        NV21_SHADER_BODY \
+;
+static const Uint8 GLES2_FragmentSrc_TextureNV21BT601Src_[] = \
+        YUV_SHADER_PROLOGUE \
+        BT601_SHADER_CONSTANTS \
+        NV21_SHADER_BODY \
+;
+static const Uint8 GLES2_FragmentSrc_TextureNV21BT709Src_[] = \
+        YUV_SHADER_PROLOGUE \
+        BT709_SHADER_CONSTANTS \
+        NV21_SHADER_BODY \
+;
+
+/* Custom Android video format texture */
+static const Uint8 GLES2_FragmentSrc_TextureExternalOESSrc_[] = " \
+    #extension GL_OES_EGL_image_external : require\n\
+    precision mediump float; \
+    uniform samplerExternalOES u_texture; \
+    uniform vec4 u_color; \
+    varying vec2 v_texCoord; \
+    \
+    void main() \
+    { \
+        gl_FragColor = texture2D(u_texture, v_texCoord); \
+        gl_FragColor *= u_color; \
+    } \
+";
+
+static const GLES2_ShaderInstance GLES2_VertexSrc_Default = {
+    GL_VERTEX_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_VertexSrc_Default_),
+    GLES2_VertexSrc_Default_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_SolidSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_SolidSrc_),
+    GLES2_FragmentSrc_SolidSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureABGRSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureABGRSrc_),
+    GLES2_FragmentSrc_TextureABGRSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureARGBSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureARGBSrc_),
+    GLES2_FragmentSrc_TextureARGBSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureRGBSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureRGBSrc_),
+    GLES2_FragmentSrc_TextureRGBSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureBGRSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureBGRSrc_),
+    GLES2_FragmentSrc_TextureBGRSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureYUVJPEGSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureYUVJPEGSrc_),
+    GLES2_FragmentSrc_TextureYUVJPEGSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureYUVBT601Src = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureYUVBT601Src_),
+    GLES2_FragmentSrc_TextureYUVBT601Src_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureYUVBT709Src = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureYUVBT709Src_),
+    GLES2_FragmentSrc_TextureYUVBT709Src_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureNV12JPEGSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureNV12JPEGSrc_),
+    GLES2_FragmentSrc_TextureNV12JPEGSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureNV12BT601Src = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureNV12BT601Src_),
+    GLES2_FragmentSrc_TextureNV12BT601Src_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureNV21BT709Src = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureNV21BT709Src_),
+    GLES2_FragmentSrc_TextureNV21BT709Src_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureNV21JPEGSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureNV21JPEGSrc_),
+    GLES2_FragmentSrc_TextureNV21JPEGSrc_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureNV21BT601Src = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureNV21BT601Src_),
+    GLES2_FragmentSrc_TextureNV21BT601Src_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureNV12BT709Src = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureNV12BT709Src_),
+    GLES2_FragmentSrc_TextureNV12BT709Src_
+};
+
+static const GLES2_ShaderInstance GLES2_FragmentSrc_TextureExternalOESSrc = {
+    GL_FRAGMENT_SHADER,
+    GLES2_SOURCE_SHADER,
+    sizeof(GLES2_FragmentSrc_TextureExternalOESSrc_),
+    GLES2_FragmentSrc_TextureExternalOESSrc_
+};
+
+
+/*************************************************************************************************
+ * Vertex/fragment shader definitions                                                            *
+ *************************************************************************************************/
+
+static GLES2_Shader GLES2_VertexShader_Default = {
+    1,
+    {
+        &GLES2_VertexSrc_Default
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_SolidSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_SolidSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureABGRSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureABGRSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureARGBSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureARGBSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureRGBSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureRGBSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureBGRSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureBGRSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureYUVJPEGSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureYUVJPEGSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureYUVBT601Src = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureYUVBT601Src
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureYUVBT709Src = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureYUVBT709Src
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureNV12JPEGSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureNV12JPEGSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureNV12BT601Src = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureNV12BT601Src
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureNV12BT709Src = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureNV12BT709Src
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureNV21JPEGSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureNV21JPEGSrc
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureNV21BT601Src = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureNV21BT601Src
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureNV21BT709Src = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureNV21BT709Src
+    }
+};
+
+static GLES2_Shader GLES2_FragmentShader_TextureExternalOESSrc = {
+    1,
+    {
+        &GLES2_FragmentSrc_TextureExternalOESSrc
+    }
+};
+
+
+/*************************************************************************************************
+ * Shader selector                                                                               *
+ *************************************************************************************************/
+
+const GLES2_Shader *GLES2_GetShader(GLES2_ShaderType type)
+{
+    switch (type) {
+    case GLES2_SHADER_VERTEX_DEFAULT:
+        return &GLES2_VertexShader_Default;
+    case GLES2_SHADER_FRAGMENT_SOLID_SRC:
+        return &GLES2_FragmentShader_SolidSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_ABGR_SRC:
+        return &GLES2_FragmentShader_TextureABGRSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_ARGB_SRC:
+        return &GLES2_FragmentShader_TextureARGBSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_RGB_SRC:
+        return &GLES2_FragmentShader_TextureRGBSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_BGR_SRC:
+        return &GLES2_FragmentShader_TextureBGRSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_YUV_JPEG_SRC:
+        return &GLES2_FragmentShader_TextureYUVJPEGSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_YUV_BT601_SRC:
+        return &GLES2_FragmentShader_TextureYUVBT601Src;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_YUV_BT709_SRC:
+        return &GLES2_FragmentShader_TextureYUVBT709Src;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_NV12_JPEG_SRC:
+        return &GLES2_FragmentShader_TextureNV12JPEGSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_NV12_BT601_SRC:
+        return &GLES2_FragmentShader_TextureNV12BT601Src;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_NV12_BT709_SRC:
+        return &GLES2_FragmentShader_TextureNV12BT709Src;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_NV21_JPEG_SRC:
+        return &GLES2_FragmentShader_TextureNV21JPEGSrc;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_NV21_BT601_SRC:
+        return &GLES2_FragmentShader_TextureNV21BT601Src;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_NV21_BT709_SRC:
+        return &GLES2_FragmentShader_TextureNV21BT709Src;
+    case GLES2_SHADER_FRAGMENT_TEXTURE_EXTERNAL_OES_SRC:
+        return &GLES2_FragmentShader_TextureExternalOESSrc;
+    default:
+        return NULL;
+    }
+}
+
+#endif /* SDL_VIDEO_RENDER_OGL_ES2 && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/opengles2/SDL_shaders_gles2.h

@@ -0,0 +1,70 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_shaders_gles2_h_
+#define SDL_shaders_gles2_h_
+
+#if SDL_VIDEO_RENDER_OGL_ES2
+
+typedef struct GLES2_ShaderInstance
+{
+    GLenum type;
+    GLenum format;
+    int length;
+    const void *data;
+} GLES2_ShaderInstance;
+
+typedef struct GLES2_Shader
+{
+    int instance_count;
+    const GLES2_ShaderInstance *instances[4];
+} GLES2_Shader;
+
+typedef enum
+{
+    GLES2_SHADER_VERTEX_DEFAULT,
+    GLES2_SHADER_FRAGMENT_SOLID_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_ABGR_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_ARGB_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_BGR_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_RGB_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_YUV_JPEG_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_YUV_BT601_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_YUV_BT709_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_NV12_JPEG_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_NV12_BT601_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_NV12_BT709_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_NV21_JPEG_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_NV21_BT601_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_NV21_BT709_SRC,
+    GLES2_SHADER_FRAGMENT_TEXTURE_EXTERNAL_OES_SRC
+} GLES2_ShaderType;
+
+#define GLES2_SOURCE_SHADER (GLenum)-1
+
+const GLES2_Shader *GLES2_GetShader(GLES2_ShaderType type);
+
+#endif /* SDL_VIDEO_RENDER_OGL_ES2 */
+
+#endif /* SDL_shaders_gles2_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_blendfillrect.c

@@ -0,0 +1,357 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
+
+#include "SDL_draw.h"
+#include "SDL_blendfillrect.h"
+
+
+static int
+SDL_BlendFillRect_RGB555(SDL_Surface * dst, const SDL_Rect * rect,
+                         SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
+        break;
+    case SDL_BLENDMODE_ADD:
+        FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
+        break;
+    case SDL_BLENDMODE_MOD:
+        FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
+        break;
+    case SDL_BLENDMODE_MUL:
+        FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB555);
+        break;
+    default:
+        FILLRECT(Uint16, DRAW_SETPIXEL_RGB555);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendFillRect_RGB565(SDL_Surface * dst, const SDL_Rect * rect,
+                         SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565);
+        break;
+    case SDL_BLENDMODE_ADD:
+        FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
+        break;
+    case SDL_BLENDMODE_MOD:
+        FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
+        break;
+    case SDL_BLENDMODE_MUL:
+        FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB565);
+        break;
+    default:
+        FILLRECT(Uint16, DRAW_SETPIXEL_RGB565);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendFillRect_RGB888(SDL_Surface * dst, const SDL_Rect * rect,
+                         SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB888);
+        break;
+    case SDL_BLENDMODE_ADD:
+        FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB888);
+        break;
+    case SDL_BLENDMODE_MOD:
+        FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB888);
+        break;
+    case SDL_BLENDMODE_MUL:
+        FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGB888);
+        break;
+    default:
+        FILLRECT(Uint32, DRAW_SETPIXEL_RGB888);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendFillRect_ARGB8888(SDL_Surface * dst, const SDL_Rect * rect,
+                           SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
+        break;
+    case SDL_BLENDMODE_ADD:
+        FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
+        break;
+    case SDL_BLENDMODE_MOD:
+        FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
+        break;
+    case SDL_BLENDMODE_MUL:
+        FILLRECT(Uint32, DRAW_SETPIXEL_MUL_ARGB8888);
+        break;
+    default:
+        FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendFillRect_RGB(SDL_Surface * dst, const SDL_Rect * rect,
+                      SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_PixelFormat *fmt = dst->format;
+    unsigned inva = 0xff - a;
+
+    switch (fmt->BytesPerPixel) {
+    case 2:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
+            break;
+        case SDL_BLENDMODE_ADD:
+            FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
+            break;
+        case SDL_BLENDMODE_MOD:
+            FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
+            break;
+        case SDL_BLENDMODE_MUL:
+            FILLRECT(Uint16, DRAW_SETPIXEL_MUL_RGB);
+            break;
+        default:
+            FILLRECT(Uint16, DRAW_SETPIXEL_RGB);
+            break;
+        }
+        return 0;
+    case 4:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
+            break;
+        case SDL_BLENDMODE_ADD:
+            FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
+            break;
+        case SDL_BLENDMODE_MOD:
+            FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
+            break;
+        case SDL_BLENDMODE_MUL:
+            FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGB);
+            break;
+        default:
+            FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
+            break;
+        }
+        return 0;
+    default:
+        return SDL_Unsupported();
+    }
+}
+
+static int
+SDL_BlendFillRect_RGBA(SDL_Surface * dst, const SDL_Rect * rect,
+                       SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_PixelFormat *fmt = dst->format;
+    unsigned inva = 0xff - a;
+
+    switch (fmt->BytesPerPixel) {
+    case 4:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
+            break;
+        case SDL_BLENDMODE_ADD:
+            FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
+            break;
+        case SDL_BLENDMODE_MOD:
+            FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
+            break;
+        case SDL_BLENDMODE_MUL:
+            FILLRECT(Uint32, DRAW_SETPIXEL_MUL_RGBA);
+            break;
+        default:
+            FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
+            break;
+        }
+        return 0;
+    default:
+        return SDL_Unsupported();
+    }
+}
+
+int
+SDL_BlendFillRect(SDL_Surface * dst, const SDL_Rect * rect,
+                  SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_Rect clipped;
+
+    if (!dst) {
+        return SDL_SetError("Passed NULL destination surface");
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        return SDL_SetError("SDL_BlendFillRect(): Unsupported surface format");
+    }
+
+    /* If 'rect' == NULL, then fill the whole surface */
+    if (rect) {
+        /* Perform clipping */
+        if (!SDL_IntersectRect(rect, &dst->clip_rect, &clipped)) {
+            return 0;
+        }
+        rect = &clipped;
+    } else {
+        rect = &dst->clip_rect;
+    }
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(r, a);
+        g = DRAW_MUL(g, a);
+        b = DRAW_MUL(b, a);
+    }
+
+    switch (dst->format->BitsPerPixel) {
+    case 15:
+        switch (dst->format->Rmask) {
+        case 0x7C00:
+            return SDL_BlendFillRect_RGB555(dst, rect, blendMode, r, g, b, a);
+        }
+        break;
+    case 16:
+        switch (dst->format->Rmask) {
+        case 0xF800:
+            return SDL_BlendFillRect_RGB565(dst, rect, blendMode, r, g, b, a);
+        }
+        break;
+    case 32:
+        switch (dst->format->Rmask) {
+        case 0x00FF0000:
+            if (!dst->format->Amask) {
+                return SDL_BlendFillRect_RGB888(dst, rect, blendMode, r, g, b, a);
+            } else {
+                return SDL_BlendFillRect_ARGB8888(dst, rect, blendMode, r, g, b, a);
+            }
+            /* break; -Wunreachable-code-break */
+        }
+        break;
+    default:
+        break;
+    }
+
+    if (!dst->format->Amask) {
+        return SDL_BlendFillRect_RGB(dst, rect, blendMode, r, g, b, a);
+    } else {
+        return SDL_BlendFillRect_RGBA(dst, rect, blendMode, r, g, b, a);
+    }
+}
+
+int
+SDL_BlendFillRects(SDL_Surface * dst, const SDL_Rect * rects, int count,
+                   SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_Rect rect;
+    int i;
+    int (*func)(SDL_Surface * dst, const SDL_Rect * rect,
+                SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
+    int status = 0;
+
+    if (!dst) {
+        return SDL_SetError("Passed NULL destination surface");
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        return SDL_SetError("SDL_BlendFillRects(): Unsupported surface format");
+    }
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(r, a);
+        g = DRAW_MUL(g, a);
+        b = DRAW_MUL(b, a);
+    }
+
+    /* FIXME: Does this function pointer slow things down significantly? */
+    switch (dst->format->BitsPerPixel) {
+    case 15:
+        switch (dst->format->Rmask) {
+        case 0x7C00:
+            func = SDL_BlendFillRect_RGB555;
+        }
+        break;
+    case 16:
+        switch (dst->format->Rmask) {
+        case 0xF800:
+            func = SDL_BlendFillRect_RGB565;
+        }
+        break;
+    case 32:
+        switch (dst->format->Rmask) {
+        case 0x00FF0000:
+            if (!dst->format->Amask) {
+                func = SDL_BlendFillRect_RGB888;
+            } else {
+                func = SDL_BlendFillRect_ARGB8888;
+            }
+            break;
+        }
+        break;
+    default:
+        break;
+    }
+
+    if (!func) {
+        if (!dst->format->Amask) {
+            func = SDL_BlendFillRect_RGB;
+        } else {
+            func = SDL_BlendFillRect_RGBA;
+        }
+    }
+
+    for (i = 0; i < count; ++i) {
+        /* Perform clipping */
+        if (!SDL_IntersectRect(&rects[i], &dst->clip_rect, &rect)) {
+            continue;
+        }
+        status = func(dst, &rect, blendMode, r, g, b, a);
+    }
+    return status;
+}
+
+#endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_blendfillrect.h

@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_blendfillrect_h_
+#define SDL_blendfillrect_h_
+
+#include "../../SDL_internal.h"
+
+
+extern int SDL_BlendFillRect(SDL_Surface * dst, const SDL_Rect * rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+extern int SDL_BlendFillRects(SDL_Surface * dst, const SDL_Rect * rects, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
+#endif /* SDL_blendfillrect_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_blendline.c

@@ -0,0 +1,875 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
+
+#include "SDL_draw.h"
+#include "SDL_blendline.h"
+#include "SDL_blendpoint.h"
+
+
+static void
+SDL_BlendLine_RGB2(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                   SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
+                   SDL_bool draw_end)
+{
+    const SDL_PixelFormat *fmt = dst->format;
+    unsigned r, g, b, a, inva;
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(_r, _a);
+        g = DRAW_MUL(_g, _a);
+        b = DRAW_MUL(_b, _a);
+        a = _a;
+    } else {
+        r = _r;
+        g = _g;
+        b = _b;
+        a = _a;
+    }
+    inva = (a ^ 0xff);
+
+    if (y1 == y2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            HLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end);
+            break;
+        default:
+            HLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
+            break;
+        }
+    } else if (x1 == x2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            VLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end);
+            break;
+        default:
+            VLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
+            break;
+        }
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end);
+            break;
+        default:
+            DLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
+            break;
+        }
+    } else {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY2_BLEND_RGB, DRAW_SETPIXELXY2_BLEND_RGB,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY2_ADD_RGB, DRAW_SETPIXELXY2_ADD_RGB,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY2_MOD_RGB, DRAW_SETPIXELXY2_MOD_RGB,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY2_MUL_RGB, DRAW_SETPIXELXY2_MUL_RGB,
+                   draw_end);
+            break;
+        default:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY2_RGB, DRAW_SETPIXELXY2_BLEND_RGB,
+                   draw_end);
+            break;
+        }
+    }
+}
+
+static void
+SDL_BlendLine_RGB555(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                     SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
+                     SDL_bool draw_end)
+{
+    unsigned r, g, b, a, inva;
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(_r, _a);
+        g = DRAW_MUL(_g, _a);
+        b = DRAW_MUL(_b, _a);
+        a = _a;
+    } else {
+        r = _r;
+        g = _g;
+        b = _b;
+        a = _a;
+    }
+    inva = (a ^ 0xff);
+
+    if (y1 == y2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            HLINE(Uint16, DRAW_SETPIXEL_MUL_RGB555, draw_end);
+            break;
+        default:
+            HLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
+            break;
+        }
+    } else if (x1 == x2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            VLINE(Uint16, DRAW_SETPIXEL_MUL_RGB555, draw_end);
+            break;
+        default:
+            VLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
+            break;
+        }
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DLINE(Uint16, DRAW_SETPIXEL_MUL_RGB555, draw_end);
+            break;
+        default:
+            DLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
+            break;
+        }
+    } else {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_BLEND_RGB555, DRAW_SETPIXELXY_BLEND_RGB555,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_ADD_RGB555, DRAW_SETPIXELXY_ADD_RGB555,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MOD_RGB555, DRAW_SETPIXELXY_MOD_RGB555,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MUL_RGB555, DRAW_SETPIXELXY_MUL_RGB555,
+                   draw_end);
+            break;
+        default:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_RGB555, DRAW_SETPIXELXY_BLEND_RGB555,
+                   draw_end);
+            break;
+        }
+    }
+}
+
+static void
+SDL_BlendLine_RGB565(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                     SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
+                     SDL_bool draw_end)
+{
+    unsigned r, g, b, a, inva;
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(_r, _a);
+        g = DRAW_MUL(_g, _a);
+        b = DRAW_MUL(_b, _a);
+        a = _a;
+    } else {
+        r = _r;
+        g = _g;
+        b = _b;
+        a = _a;
+    }
+    inva = (a ^ 0xff);
+
+    if (y1 == y2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            HLINE(Uint16, DRAW_SETPIXEL_MUL_RGB565, draw_end);
+            break;
+        default:
+            HLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
+            break;
+        }
+    } else if (x1 == x2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            VLINE(Uint16, DRAW_SETPIXEL_MUL_RGB565, draw_end);
+            break;
+        default:
+            VLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
+            break;
+        }
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DLINE(Uint16, DRAW_SETPIXEL_MUL_RGB565, draw_end);
+            break;
+        default:
+            DLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
+            break;
+        }
+    } else {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_BLEND_RGB565, DRAW_SETPIXELXY_BLEND_RGB565,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_ADD_RGB565, DRAW_SETPIXELXY_ADD_RGB565,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MOD_RGB565, DRAW_SETPIXELXY_MOD_RGB565,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MUL_RGB565, DRAW_SETPIXELXY_MUL_RGB565,
+                   draw_end);
+            break;
+        default:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_RGB565, DRAW_SETPIXELXY_BLEND_RGB565,
+                   draw_end);
+            break;
+        }
+    }
+}
+
+static void
+SDL_BlendLine_RGB4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                   SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
+                   SDL_bool draw_end)
+{
+    const SDL_PixelFormat *fmt = dst->format;
+    unsigned r, g, b, a, inva;
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(_r, _a);
+        g = DRAW_MUL(_g, _a);
+        b = DRAW_MUL(_b, _a);
+        a = _a;
+    } else {
+        r = _r;
+        g = _g;
+        b = _b;
+        a = _a;
+    }
+    inva = (a ^ 0xff);
+
+    if (y1 == y2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            HLINE(Uint32, DRAW_SETPIXEL_MUL_RGB, draw_end);
+            break;
+        default:
+            HLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
+            break;
+        }
+    } else if (x1 == x2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            VLINE(Uint32, DRAW_SETPIXEL_MUL_RGB, draw_end);
+            break;
+        default:
+            VLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
+            break;
+        }
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DLINE(Uint32, DRAW_SETPIXEL_MUL_RGB, draw_end);
+            break;
+        default:
+            DLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
+            break;
+        }
+    } else {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_BLEND_RGB, DRAW_SETPIXELXY4_BLEND_RGB,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_ADD_RGB, DRAW_SETPIXELXY4_ADD_RGB,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_MOD_RGB, DRAW_SETPIXELXY4_MOD_RGB,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_MUL_RGB, DRAW_SETPIXELXY4_MUL_RGB,
+                   draw_end);
+            break;
+        default:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_RGB, DRAW_SETPIXELXY4_BLEND_RGB,
+                   draw_end);
+            break;
+        }
+    }
+}
+
+static void
+SDL_BlendLine_RGBA4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                    SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
+                    SDL_bool draw_end)
+{
+    const SDL_PixelFormat *fmt = dst->format;
+    unsigned r, g, b, a, inva;
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(_r, _a);
+        g = DRAW_MUL(_g, _a);
+        b = DRAW_MUL(_b, _a);
+        a = _a;
+    } else {
+        r = _r;
+        g = _g;
+        b = _b;
+        a = _a;
+    }
+    inva = (a ^ 0xff);
+
+    if (y1 == y2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            HLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            HLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            HLINE(Uint32, DRAW_SETPIXEL_MUL_RGBA, draw_end);
+            break;
+        default:
+            HLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
+            break;
+        }
+    } else if (x1 == x2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            VLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            VLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            VLINE(Uint32, DRAW_SETPIXEL_MUL_RGBA, draw_end);
+            break;
+        default:
+            VLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
+            break;
+        }
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DLINE(Uint32, DRAW_SETPIXEL_MUL_RGBA, draw_end);
+            break;
+        default:
+            DLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
+            break;
+        }
+    } else {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_BLEND_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_ADD_RGBA, DRAW_SETPIXELXY4_ADD_RGBA,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_MOD_RGBA, DRAW_SETPIXELXY4_MOD_RGBA,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_MUL_RGBA, DRAW_SETPIXELXY4_MUL_RGBA,
+                   draw_end);
+            break;
+        default:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY4_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA,
+                   draw_end);
+            break;
+        }
+    }
+}
+
+static void
+SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                     SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
+                     SDL_bool draw_end)
+{
+    unsigned r, g, b, a, inva;
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(_r, _a);
+        g = DRAW_MUL(_g, _a);
+        b = DRAW_MUL(_b, _a);
+        a = _a;
+    } else {
+        r = _r;
+        g = _g;
+        b = _b;
+        a = _a;
+    }
+    inva = (a ^ 0xff);
+
+    if (y1 == y2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            HLINE(Uint32, DRAW_SETPIXEL_MUL_RGB888, draw_end);
+            break;
+        default:
+            HLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
+            break;
+        }
+    } else if (x1 == x2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            VLINE(Uint32, DRAW_SETPIXEL_MUL_RGB888, draw_end);
+            break;
+        default:
+            VLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
+            break;
+        }
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DLINE(Uint32, DRAW_SETPIXEL_MUL_RGB888, draw_end);
+            break;
+        default:
+            DLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
+            break;
+        }
+    } else {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_BLEND_RGB888, DRAW_SETPIXELXY_BLEND_RGB888,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_ADD_RGB888, DRAW_SETPIXELXY_ADD_RGB888,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MOD_RGB888, DRAW_SETPIXELXY_MOD_RGB888,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MUL_RGB888, DRAW_SETPIXELXY_MUL_RGB888,
+                   draw_end);
+            break;
+        default:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_RGB888, DRAW_SETPIXELXY_BLEND_RGB888,
+                   draw_end);
+            break;
+        }
+    }
+}
+
+static void
+SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+                       SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
+                       SDL_bool draw_end)
+{
+    unsigned r, g, b, a, inva;
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(_r, _a);
+        g = DRAW_MUL(_g, _a);
+        b = DRAW_MUL(_b, _a);
+        a = _a;
+    } else {
+        r = _r;
+        g = _g;
+        b = _b;
+        a = _a;
+    }
+    inva = (a ^ 0xff);
+
+    if (y1 == y2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            HLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            HLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            HLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            HLINE(Uint32, DRAW_SETPIXEL_MUL_ARGB8888, draw_end);
+            break;
+        default:
+            HLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
+            break;
+        }
+    } else if (x1 == x2) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            VLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            VLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            VLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            VLINE(Uint32, DRAW_SETPIXEL_MUL_ARGB8888, draw_end);
+            break;
+        default:
+            VLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
+            break;
+        }
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DLINE(Uint32, DRAW_SETPIXEL_MUL_ARGB8888, draw_end);
+            break;
+        default:
+            DLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
+            break;
+        }
+    } else {
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_BLEND_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_ADD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_ADD_ARGB8888, DRAW_SETPIXELXY_ADD_ARGB8888,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MOD:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MOD_ARGB8888, DRAW_SETPIXELXY_MOD_ARGB8888,
+                   draw_end);
+            break;
+        case SDL_BLENDMODE_MUL:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_MUL_ARGB8888, DRAW_SETPIXELXY_MUL_ARGB8888,
+                   draw_end);
+            break;
+        default:
+            AALINE(x1, y1, x2, y2,
+                   DRAW_SETPIXELXY_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888,
+                   draw_end);
+            break;
+        }
+    }
+}
+
+typedef void (*BlendLineFunc) (SDL_Surface * dst,
+                               int x1, int y1, int x2, int y2,
+                               SDL_BlendMode blendMode,
+                               Uint8 r, Uint8 g, Uint8 b, Uint8 a,
+                               SDL_bool draw_end);
+
+static BlendLineFunc
+SDL_CalculateBlendLineFunc(const SDL_PixelFormat * fmt)
+{
+    switch (fmt->BytesPerPixel) {
+    case 2:
+        if (fmt->Rmask == 0x7C00) {
+            return SDL_BlendLine_RGB555;
+        } else if (fmt->Rmask == 0xF800) {
+            return SDL_BlendLine_RGB565;
+        } else {
+            return SDL_BlendLine_RGB2;
+        }
+        /* break; -Wunreachable-code-break */
+    case 4:
+        if (fmt->Rmask == 0x00FF0000) {
+            if (fmt->Amask) {
+                return SDL_BlendLine_ARGB8888;
+            } else {
+                return SDL_BlendLine_RGB888;
+            }
+        } else {
+            if (fmt->Amask) {
+                return SDL_BlendLine_RGBA4;
+            } else {
+                return SDL_BlendLine_RGB4;
+            }
+        }
+    }
+    return NULL;
+}
+
+int
+SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+              SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    BlendLineFunc func;
+
+    if (!dst) {
+        return SDL_SetError("SDL_BlendLine(): Passed NULL destination surface");
+    }
+
+    func = SDL_CalculateBlendLineFunc(dst->format);
+    if (!func) {
+        return SDL_SetError("SDL_BlendLine(): Unsupported surface format");
+    }
+
+    /* Perform clipping */
+    /* FIXME: We don't actually want to clip, as it may change line slope */
+    if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
+        return 0;
+    }
+
+    func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, SDL_TRUE);
+    return 0;
+}
+
+int
+SDL_BlendLines(SDL_Surface * dst, const SDL_Point * points, int count,
+               SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    int i;
+    int x1, y1;
+    int x2, y2;
+    SDL_bool draw_end;
+    BlendLineFunc func;
+
+    if (!dst) {
+        return SDL_SetError("SDL_BlendLines(): Passed NULL destination surface");
+    }
+
+    func = SDL_CalculateBlendLineFunc(dst->format);
+    if (!func) {
+        return SDL_SetError("SDL_BlendLines(): Unsupported surface format");
+    }
+
+    for (i = 1; i < count; ++i) {
+        x1 = points[i-1].x;
+        y1 = points[i-1].y;
+        x2 = points[i].x;
+        y2 = points[i].y;
+
+        /* Perform clipping */
+        /* FIXME: We don't actually want to clip, as it may change line slope */
+        if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
+            continue;
+        }
+
+        /* Draw the end if it was clipped */
+        draw_end = (x2 != points[i].x || y2 != points[i].y);
+
+        func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, draw_end);
+    }
+    if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
+        SDL_BlendPoint(dst, points[count-1].x, points[count-1].y,
+                       blendMode, r, g, b, a);
+    }
+    return 0;
+}
+
+#endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_blendline.h

@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_blendline_h_
+#define SDL_blendline_h_
+
+#include "../../SDL_internal.h"
+
+
+extern int SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+extern int SDL_BlendLines(SDL_Surface * dst, const SDL_Point * points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
+#endif /* SDL_blendline_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_blendpoint.c

@@ -0,0 +1,362 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
+
+#include "SDL_draw.h"
+#include "SDL_blendpoint.h"
+
+
+static int
+SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
+                      Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_RGB555(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_RGB555(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_RGB555(x, y);
+        break;
+    case SDL_BLENDMODE_MUL:
+        DRAW_SETPIXELXY_MUL_RGB555(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_RGB555(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
+                      Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_RGB565(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_RGB565(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_RGB565(x, y);
+        break;
+    case SDL_BLENDMODE_MUL:
+        DRAW_SETPIXELXY_MUL_RGB565(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_RGB565(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
+                      Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_RGB888(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_RGB888(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_RGB888(x, y);
+        break;
+    case SDL_BLENDMODE_MUL:
+        DRAW_SETPIXELXY_MUL_RGB888(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_RGB888(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode,
+                        Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    unsigned inva = 0xff - a;
+
+    switch (blendMode) {
+    case SDL_BLENDMODE_BLEND:
+        DRAW_SETPIXELXY_BLEND_ARGB8888(x, y);
+        break;
+    case SDL_BLENDMODE_ADD:
+        DRAW_SETPIXELXY_ADD_ARGB8888(x, y);
+        break;
+    case SDL_BLENDMODE_MOD:
+        DRAW_SETPIXELXY_MOD_ARGB8888(x, y);
+        break;
+    case SDL_BLENDMODE_MUL:
+        DRAW_SETPIXELXY_MUL_ARGB8888(x, y);
+        break;
+    default:
+        DRAW_SETPIXELXY_ARGB8888(x, y);
+        break;
+    }
+    return 0;
+}
+
+static int
+SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
+                   Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_PixelFormat *fmt = dst->format;
+    unsigned inva = 0xff - a;
+
+    switch (fmt->BytesPerPixel) {
+    case 2:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DRAW_SETPIXELXY2_BLEND_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DRAW_SETPIXELXY2_ADD_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DRAW_SETPIXELXY2_MOD_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DRAW_SETPIXELXY2_MUL_RGB(x, y);
+            break;
+        default:
+            DRAW_SETPIXELXY2_RGB(x, y);
+            break;
+        }
+        return 0;
+    case 4:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DRAW_SETPIXELXY4_BLEND_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DRAW_SETPIXELXY4_ADD_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DRAW_SETPIXELXY4_MOD_RGB(x, y);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DRAW_SETPIXELXY4_MUL_RGB(x, y);
+            break;
+        default:
+            DRAW_SETPIXELXY4_RGB(x, y);
+            break;
+        }
+        return 0;
+    default:
+        return SDL_Unsupported();
+    }
+}
+
+static int
+SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
+                    Uint8 g, Uint8 b, Uint8 a)
+{
+    SDL_PixelFormat *fmt = dst->format;
+    unsigned inva = 0xff - a;
+
+    switch (fmt->BytesPerPixel) {
+    case 4:
+        switch (blendMode) {
+        case SDL_BLENDMODE_BLEND:
+            DRAW_SETPIXELXY4_BLEND_RGBA(x, y);
+            break;
+        case SDL_BLENDMODE_ADD:
+            DRAW_SETPIXELXY4_ADD_RGBA(x, y);
+            break;
+        case SDL_BLENDMODE_MOD:
+            DRAW_SETPIXELXY4_MOD_RGBA(x, y);
+            break;
+        case SDL_BLENDMODE_MUL:
+            DRAW_SETPIXELXY4_MUL_RGBA(x, y);
+            break;
+        default:
+            DRAW_SETPIXELXY4_RGBA(x, y);
+            break;
+        }
+        return 0;
+    default:
+        return SDL_Unsupported();
+    }
+}
+
+int
+SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
+               Uint8 g, Uint8 b, Uint8 a)
+{
+    if (!dst) {
+        return SDL_SetError("Passed NULL destination surface");
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        return SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
+    }
+
+    /* Perform clipping */
+    if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
+        x >= (dst->clip_rect.x + dst->clip_rect.w) ||
+        y >= (dst->clip_rect.y + dst->clip_rect.h)) {
+        return 0;
+    }
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(r, a);
+        g = DRAW_MUL(g, a);
+        b = DRAW_MUL(b, a);
+    }
+
+    switch (dst->format->BitsPerPixel) {
+    case 15:
+        switch (dst->format->Rmask) {
+        case 0x7C00:
+            return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
+        }
+        break;
+    case 16:
+        switch (dst->format->Rmask) {
+        case 0xF800:
+            return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
+        }
+        break;
+    case 32:
+        switch (dst->format->Rmask) {
+        case 0x00FF0000:
+            if (!dst->format->Amask) {
+                return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, a);
+            } else {
+                return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, a);
+            }
+            /* break; -Wunreachable-code-break */
+        }
+        break;
+    default:
+        break;
+    }
+
+    if (!dst->format->Amask) {
+        return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
+    } else {
+        return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
+    }
+}
+
+int
+SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count,
+                SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    int minx, miny;
+    int maxx, maxy;
+    int i;
+    int x, y;
+    int (*func)(SDL_Surface * dst, int x, int y,
+                SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
+    int status = 0;
+
+    if (!dst) {
+        return SDL_SetError("Passed NULL destination surface");
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        return SDL_SetError("SDL_BlendPoints(): Unsupported surface format");
+    }
+
+    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
+        r = DRAW_MUL(r, a);
+        g = DRAW_MUL(g, a);
+        b = DRAW_MUL(b, a);
+    }
+
+    /* FIXME: Does this function pointer slow things down significantly? */
+    switch (dst->format->BitsPerPixel) {
+    case 15:
+        switch (dst->format->Rmask) {
+        case 0x7C00:
+            func = SDL_BlendPoint_RGB555;
+            break;
+        }
+        break;
+    case 16:
+        switch (dst->format->Rmask) {
+        case 0xF800:
+            func = SDL_BlendPoint_RGB565;
+            break;
+        }
+        break;
+    case 32:
+        switch (dst->format->Rmask) {
+        case 0x00FF0000:
+            if (!dst->format->Amask) {
+                func = SDL_BlendPoint_RGB888;
+            } else {
+                func = SDL_BlendPoint_ARGB8888;
+            }
+            break;
+        }
+        break;
+    default:
+        break;
+    }
+
+    if (!func) {
+        if (!dst->format->Amask) {
+            func = SDL_BlendPoint_RGB;
+        } else {
+            func = SDL_BlendPoint_RGBA;
+        }
+    }
+
+    minx = dst->clip_rect.x;
+    maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
+    miny = dst->clip_rect.y;
+    maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
+
+    for (i = 0; i < count; ++i) {
+        x = points[i].x;
+        y = points[i].y;
+
+        if (x < minx || x > maxx || y < miny || y > maxy) {
+            continue;
+        }
+        status = func(dst, x, y, blendMode, r, g, b, a);
+    }
+    return status;
+}
+
+#endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_blendpoint.h

@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_blendpoint_h_
+#define SDL_blendpoint_h_
+
+#include "../../SDL_internal.h"
+
+
+extern int SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+extern int SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
+#endif /* SDL_blendpoint_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_draw.h

@@ -0,0 +1,632 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#include "../../video/SDL_blit.h"
+
+/* This code assumes that r, g, b, a are the source color,
+ * and in the blend and add case, the RGB values are premultiplied by a.
+ */
+
+#define DRAW_MUL(_a, _b) (((unsigned)(_a)*(_b))/255)
+
+#define DRAW_FASTSETPIXEL(type) \
+    *pixel = (type) color
+
+#define DRAW_FASTSETPIXEL1 DRAW_FASTSETPIXEL(Uint8)
+#define DRAW_FASTSETPIXEL2 DRAW_FASTSETPIXEL(Uint16)
+#define DRAW_FASTSETPIXEL4 DRAW_FASTSETPIXEL(Uint32)
+
+#define DRAW_FASTSETPIXELXY(x, y, type, bpp, color) \
+    *(type *)((Uint8 *)dst->pixels + (y) * dst->pitch \
+                                   + (x) * bpp) = (type) color
+
+#define DRAW_FASTSETPIXELXY1(x, y) DRAW_FASTSETPIXELXY(x, y, Uint8, 1, color)
+#define DRAW_FASTSETPIXELXY2(x, y) DRAW_FASTSETPIXELXY(x, y, Uint16, 2, color)
+#define DRAW_FASTSETPIXELXY4(x, y) DRAW_FASTSETPIXELXY(x, y, Uint32, 4, color)
+
+#define DRAW_SETPIXEL(setpixel) \
+do { \
+    unsigned sr = r, sg = g, sb = b, sa = a; (void) sa; \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
+do { \
+    unsigned sr, sg, sb, sa = 0xFF; \
+    getpixel; \
+    sr = DRAW_MUL(inva, sr) + r; \
+    sg = DRAW_MUL(inva, sg) + g; \
+    sb = DRAW_MUL(inva, sb) + b; \
+    sa = DRAW_MUL(inva, sa) + a; \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
+do { \
+    unsigned sr, sg, sb, sa; (void) sa; \
+    getpixel; \
+    sr += r; if (sr > 0xff) sr = 0xff; \
+    sg += g; if (sg > 0xff) sg = 0xff; \
+    sb += b; if (sb > 0xff) sb = 0xff; \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
+do { \
+    unsigned sr, sg, sb, sa; (void) sa; \
+    getpixel; \
+    sr = DRAW_MUL(sr, r); \
+    sg = DRAW_MUL(sg, g); \
+    sb = DRAW_MUL(sb, b); \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXEL_MUL(getpixel, setpixel) \
+do { \
+    unsigned sr, sg, sb, sa; sa = 0xFF; \
+    getpixel; \
+    sr = DRAW_MUL(sr, r) + DRAW_MUL(inva, sr); if (sr > 0xff) sr = 0xff; \
+    sg = DRAW_MUL(sg, g) + DRAW_MUL(inva, sg); if (sg > 0xff) sg = 0xff; \
+    sb = DRAW_MUL(sb, b) + DRAW_MUL(inva, sb); if (sb > 0xff) sb = 0xff; \
+    sa = DRAW_MUL(sa, a) + DRAW_MUL(inva, sa); if (sa > 0xff) sa = 0xff; \
+    setpixel; \
+} while (0)
+
+#define DRAW_SETPIXELXY(x, y, type, bpp, op) \
+do { \
+    type *pixel = (type *)((Uint8 *)dst->pixels + (y) * dst->pitch \
+                                                + (x) * bpp); \
+    op; \
+} while (0)
+
+/*
+ * Define draw operators for RGB555
+ */
+
+#define DRAW_SETPIXEL_RGB555 \
+    DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB555 \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
+                        RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB555 \
+    DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
+                      RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB555 \
+    DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
+                      RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MUL_RGB555 \
+    DRAW_SETPIXEL_MUL(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
+                      RGB555_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXELXY_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
+
+#define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
+
+#define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
+
+#define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
+
+#define DRAW_SETPIXELXY_MUL_RGB555(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MUL_RGB555)
+
+/*
+ * Define draw operators for RGB565
+ */
+
+#define DRAW_SETPIXEL_RGB565 \
+    DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB565 \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
+                        RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB565 \
+    DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
+                      RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB565 \
+    DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
+                      RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MUL_RGB565 \
+    DRAW_SETPIXEL_MUL(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
+                      RGB565_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXELXY_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
+
+#define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
+
+#define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
+
+#define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
+
+#define DRAW_SETPIXELXY_MUL_RGB565(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MUL_RGB565)
+
+/*
+ * Define draw operators for RGB888
+ */
+
+#define DRAW_SETPIXEL_RGB888 \
+    DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB888 \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
+                        RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB888 \
+    DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
+                      RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB888 \
+    DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
+                      RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MUL_RGB888 \
+    DRAW_SETPIXEL_MUL(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
+                      RGB888_FROM_RGB(*pixel, sr, sg, sb))
+
+#define DRAW_SETPIXELXY_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
+
+#define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
+
+#define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
+
+#define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
+
+#define DRAW_SETPIXELXY_MUL_RGB888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MUL_RGB888)
+
+/*
+ * Define draw operators for ARGB8888
+ */
+
+#define DRAW_SETPIXEL_ARGB8888 \
+    DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_BLEND_ARGB8888 \
+    DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
+                        ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_ADD_ARGB8888 \
+    DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
+                      ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_MOD_ARGB8888 \
+    DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
+                      ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_MUL_ARGB8888 \
+    DRAW_SETPIXEL_MUL(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
+                      ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
+
+#define DRAW_SETPIXELXY_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
+
+#define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
+
+#define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
+
+#define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888)
+
+#define DRAW_SETPIXELXY_MUL_ARGB8888(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MUL_ARGB8888)
+
+/*
+ * Define draw operators for general RGB
+ */
+
+#define DRAW_SETPIXEL_RGB \
+    DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXEL_BLEND_RGB \
+    DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
+                        PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXEL_ADD_RGB \
+    DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
+                      PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MOD_RGB \
+    DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
+                      PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXEL_MUL_RGB \
+    DRAW_SETPIXEL_MUL(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
+                      PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
+
+#define DRAW_SETPIXELXY2_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
+
+#define DRAW_SETPIXELXY4_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
+
+#define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
+
+#define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
+
+#define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
+
+#define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
+
+#define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
+
+#define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
+
+#define DRAW_SETPIXELXY2_MUL_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MUL_RGB)
+
+#define DRAW_SETPIXELXY4_MUL_RGB(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MUL_RGB)
+
+
+/*
+ * Define draw operators for general RGBA
+ */
+
+#define DRAW_SETPIXEL_RGBA \
+    DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_BLEND_RGBA \
+    DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
+                        PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_ADD_RGBA \
+    DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
+                      PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_MOD_RGBA \
+    DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
+                      PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXEL_MUL_RGBA \
+    DRAW_SETPIXEL_MUL(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
+                      PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
+
+#define DRAW_SETPIXELXY4_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
+
+#define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
+
+#define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
+
+#define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
+
+#define DRAW_SETPIXELXY4_MUL_RGBA(x, y) \
+    DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MUL_RGBA)
+
+/*
+ * Define line drawing macro
+ */
+
+#define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
+
+/* Horizontal line */
+#define HLINE(type, op, draw_end) \
+{ \
+    int length; \
+    int pitch = (dst->pitch / dst->format->BytesPerPixel); \
+    type *pixel; \
+    if (x1 <= x2) { \
+        pixel = (type *)dst->pixels + y1 * pitch + x1; \
+        length = draw_end ? (x2-x1+1) : (x2-x1); \
+    } else { \
+        pixel = (type *)dst->pixels + y1 * pitch + x2; \
+        if (!draw_end) { \
+            ++pixel; \
+        } \
+        length = draw_end ? (x1-x2+1) : (x1-x2); \
+    } \
+    while (length--) { \
+        op; \
+        ++pixel; \
+    } \
+}
+
+/* Vertical line */
+#define VLINE(type, op, draw_end) \
+{ \
+    int length; \
+    int pitch = (dst->pitch / dst->format->BytesPerPixel); \
+    type *pixel; \
+    if (y1 <= y2) { \
+        pixel = (type *)dst->pixels + y1 * pitch + x1; \
+        length = draw_end ? (y2-y1+1) : (y2-y1); \
+    } else { \
+        pixel = (type *)dst->pixels + y2 * pitch + x1; \
+        if (!draw_end) { \
+            pixel += pitch; \
+        } \
+        length = draw_end ? (y1-y2+1) : (y1-y2); \
+    } \
+    while (length--) { \
+        op; \
+        pixel += pitch; \
+    } \
+}
+
+/* Diagonal line */
+#define DLINE(type, op, draw_end) \
+{ \
+    int length; \
+    int pitch = (dst->pitch / dst->format->BytesPerPixel); \
+    type *pixel; \
+    if (y1 <= y2) { \
+        pixel = (type *)dst->pixels + y1 * pitch + x1; \
+        if (x1 <= x2) { \
+            ++pitch; \
+        } else { \
+            --pitch; \
+        } \
+        length = (y2-y1); \
+    } else { \
+        pixel = (type *)dst->pixels + y2 * pitch + x2; \
+        if (x2 <= x1) { \
+            ++pitch; \
+        } else { \
+            --pitch; \
+        } \
+        if (!draw_end) { \
+            pixel += pitch; \
+        } \
+        length = (y1-y2); \
+    } \
+    if (draw_end) { \
+        ++length; \
+    } \
+    while (length--) { \
+        op; \
+        pixel += pitch; \
+    } \
+}
+
+/* Bresenham's line algorithm */
+#define BLINE(x1, y1, x2, y2, op, draw_end) \
+{ \
+    int i, deltax, deltay, numpixels; \
+    int d, dinc1, dinc2; \
+    int x, xinc1, xinc2; \
+    int y, yinc1, yinc2; \
+ \
+    deltax = ABS(x2 - x1); \
+    deltay = ABS(y2 - y1); \
+ \
+    if (deltax >= deltay) { \
+        numpixels = deltax + 1; \
+        d = (2 * deltay) - deltax; \
+        dinc1 = deltay * 2; \
+        dinc2 = (deltay - deltax) * 2; \
+        xinc1 = 1; \
+        xinc2 = 1; \
+        yinc1 = 0; \
+        yinc2 = 1; \
+    } else { \
+        numpixels = deltay + 1; \
+        d = (2 * deltax) - deltay; \
+        dinc1 = deltax * 2; \
+        dinc2 = (deltax - deltay) * 2; \
+        xinc1 = 0; \
+        xinc2 = 1; \
+        yinc1 = 1; \
+        yinc2 = 1; \
+    } \
+ \
+    if (x1 > x2) { \
+        xinc1 = -xinc1; \
+        xinc2 = -xinc2; \
+    } \
+    if (y1 > y2) { \
+        yinc1 = -yinc1; \
+        yinc2 = -yinc2; \
+    } \
+ \
+    x = x1; \
+    y = y1; \
+ \
+    if (!draw_end) { \
+        --numpixels; \
+    } \
+    for (i = 0; i < numpixels; ++i) { \
+        op(x, y); \
+        if (d < 0) { \
+            d += dinc1; \
+            x += xinc1; \
+            y += yinc1; \
+        } else { \
+            d += dinc2; \
+            x += xinc2; \
+            y += yinc2; \
+        } \
+    } \
+}
+
+/* Xiaolin Wu's line algorithm, based on Michael Abrash's implementation */
+#define WULINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
+{ \
+    Uint16 ErrorAdj, ErrorAcc; \
+    Uint16 ErrorAccTemp, Weighting; \
+    int DeltaX, DeltaY, Temp, XDir; \
+    unsigned r, g, b, a, inva; \
+ \
+    /* Draw the initial pixel, which is always exactly intersected by \
+       the line and so needs no weighting */ \
+    opaque_op(x1, y1); \
+ \
+    /* Draw the final pixel, which is always exactly intersected by the line \
+       and so needs no weighting */ \
+    if (draw_end) { \
+        opaque_op(x2, y2); \
+    } \
+ \
+    /* Make sure the line runs top to bottom */ \
+    if (y1 > y2) { \
+        Temp = y1; y1 = y2; y2 = Temp; \
+        Temp = x1; x1 = x2; x2 = Temp; \
+    } \
+    DeltaY = y2 - y1; \
+ \
+    if ((DeltaX = x2 - x1) >= 0) { \
+        XDir = 1; \
+    } else { \
+        XDir = -1; \
+        DeltaX = -DeltaX; /* make DeltaX positive */ \
+    } \
+ \
+    /* line is not horizontal, diagonal, or vertical */ \
+    ErrorAcc = 0;  /* initialize the line error accumulator to 0 */ \
+ \
+    /* Is this an X-major or Y-major line? */ \
+    if (DeltaY > DeltaX) { \
+        /* Y-major line; calculate 16-bit fixed-point fractional part of a \
+          pixel that X advances each time Y advances 1 pixel, truncating the \
+          result so that we won't overrun the endpoint along the X axis */ \
+        ErrorAdj = ((unsigned long) DeltaX << 16) / (unsigned long) DeltaY; \
+        /* Draw all pixels other than the first and last */ \
+        while (--DeltaY) { \
+            ErrorAccTemp = ErrorAcc;   /* remember currrent accumulated error */ \
+            ErrorAcc += ErrorAdj;      /* calculate error for next pixel */ \
+            if (ErrorAcc <= ErrorAccTemp) { \
+                /* The error accumulator turned over, so advance the X coord */ \
+                x1 += XDir; \
+            } \
+            y1++; /* Y-major, so always advance Y */ \
+            /* The IntensityBits most significant bits of ErrorAcc give us the \
+             intensity weighting for this pixel, and the complement of the \
+             weighting for the paired pixel */ \
+            Weighting = ErrorAcc >> 8; \
+            { \
+                a = DRAW_MUL(_a, (Weighting ^ 255)); \
+                r = DRAW_MUL(_r, a); \
+                g = DRAW_MUL(_g, a); \
+                b = DRAW_MUL(_b, a); \
+                inva = (a ^ 0xFF); \
+                blend_op(x1, y1); \
+            } \
+            { \
+                a = DRAW_MUL(_a, Weighting); \
+                r = DRAW_MUL(_r, a); \
+                g = DRAW_MUL(_g, a); \
+                b = DRAW_MUL(_b, a); \
+                inva = (a ^ 0xFF); \
+                blend_op(x1 + XDir, y1); \
+            } \
+        } \
+    } else { \
+        /* X-major line; calculate 16-bit fixed-point fractional part of a \
+           pixel that Y advances each time X advances 1 pixel, truncating the \
+           result to avoid overrunning the endpoint along the X axis */ \
+        ErrorAdj = ((unsigned long) DeltaY << 16) / (unsigned long) DeltaX; \
+        /* Draw all pixels other than the first and last */ \
+        while (--DeltaX) { \
+            ErrorAccTemp = ErrorAcc;   /* remember currrent accumulated error */ \
+            ErrorAcc += ErrorAdj;      /* calculate error for next pixel */ \
+            if (ErrorAcc <= ErrorAccTemp) { \
+                /* The error accumulator turned over, so advance the Y coord */ \
+                y1++; \
+            } \
+            x1 += XDir; /* X-major, so always advance X */ \
+            /* The IntensityBits most significant bits of ErrorAcc give us the \
+              intensity weighting for this pixel, and the complement of the \
+              weighting for the paired pixel */ \
+            Weighting = ErrorAcc >> 8; \
+            { \
+                a = DRAW_MUL(_a, (Weighting ^ 255)); \
+                r = DRAW_MUL(_r, a); \
+                g = DRAW_MUL(_g, a); \
+                b = DRAW_MUL(_b, a); \
+                inva = (a ^ 0xFF); \
+                blend_op(x1, y1); \
+            } \
+            { \
+                a = DRAW_MUL(_a, Weighting); \
+                r = DRAW_MUL(_r, a); \
+                g = DRAW_MUL(_g, a); \
+                b = DRAW_MUL(_b, a); \
+                inva = (a ^ 0xFF); \
+                blend_op(x1, y1 + 1); \
+            } \
+        } \
+    } \
+}
+
+#ifdef AA_LINES
+#define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
+            WULINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end)
+#else
+#define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
+            BLINE(x1, y1, x2, y2, opaque_op, draw_end)
+#endif
+
+/*
+ * Define fill rect macro
+ */
+
+#define FILLRECT(type, op) \
+do { \
+    int width = rect->w; \
+    int height = rect->h; \
+    int pitch = (dst->pitch / dst->format->BytesPerPixel); \
+    int skip = pitch - width; \
+    type *pixel = (type *)dst->pixels + rect->y * pitch + rect->x; \
+    while (height--) { \
+        { int n = (width+3)/4; \
+            switch (width & 3) { \
+            case 0: do {   op; pixel++; /* fallthrough */ \
+            case 3:        op; pixel++; /* fallthrough */ \
+            case 2:        op; pixel++; /* fallthrough */ \
+            case 1:        op; pixel++; /* fallthrough */ \
+                    } while ( --n > 0 ); \
+            } \
+        } \
+        pixel += skip; \
+    } \
+} while (0)
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_drawline.c

@@ -0,0 +1,209 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
+
+#include "SDL_draw.h"
+#include "SDL_drawline.h"
+#include "SDL_drawpoint.h"
+
+
+static void
+SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+              SDL_bool draw_end)
+{
+    if (y1 == y2) {
+        int length;
+        int pitch = (dst->pitch / dst->format->BytesPerPixel);
+        Uint8 *pixel;
+        if (x1 <= x2) {
+            pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
+            length = draw_end ? (x2-x1+1) : (x2-x1);
+        } else {
+            pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
+            if (!draw_end) {
+                ++pixel;
+            }
+            length = draw_end ? (x1-x2+1) : (x1-x2);
+        }
+        SDL_memset(pixel, color, length);
+    } else if (x1 == x2) {
+        VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
+    } else {
+        BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
+    }
+}
+
+static void
+SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+              SDL_bool draw_end)
+{
+    if (y1 == y2) {
+        HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+    } else if (x1 == x2) {
+        VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+    } else {
+        Uint8 _r, _g, _b, _a;
+        const SDL_PixelFormat * fmt = dst->format;
+        SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
+        if (fmt->Rmask == 0x7C00) {
+            AALINE(x1, y1, x2, y2,
+                   DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
+                   draw_end);
+        } else if (fmt->Rmask == 0xF800) {
+            AALINE(x1, y1, x2, y2,
+                   DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
+                   draw_end);
+        } else {
+            AALINE(x1, y1, x2, y2,
+                   DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
+                   draw_end);
+        }
+    }
+}
+
+static void
+SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+              SDL_bool draw_end)
+{
+    if (y1 == y2) {
+        HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+    } else if (x1 == x2) {
+        VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+        DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+    } else {
+        Uint8 _r, _g, _b, _a;
+        const SDL_PixelFormat * fmt = dst->format;
+        SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
+        if (fmt->Rmask == 0x00FF0000) {
+            if (!fmt->Amask) {
+                AALINE(x1, y1, x2, y2,
+                       DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
+                       draw_end);
+            } else {
+                AALINE(x1, y1, x2, y2,
+                       DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
+                       draw_end);
+            }
+        } else {
+            AALINE(x1, y1, x2, y2,
+                   DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
+                   draw_end);
+        }
+    }
+}
+
+typedef void (*DrawLineFunc) (SDL_Surface * dst,
+                              int x1, int y1, int x2, int y2,
+                              Uint32 color, SDL_bool draw_end);
+
+static DrawLineFunc
+SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
+{
+    switch (fmt->BytesPerPixel) {
+    case 1:
+        if (fmt->BitsPerPixel < 8) {
+            break;
+        }
+        return SDL_DrawLine1;
+    case 2:
+        return SDL_DrawLine2;
+    case 4:
+        return SDL_DrawLine4;
+    }
+    return NULL;
+}
+
+int
+SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
+{
+    DrawLineFunc func;
+
+    if (!dst) {
+        return SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
+    }
+
+    func = SDL_CalculateDrawLineFunc(dst->format);
+    if (!func) {
+        return SDL_SetError("SDL_DrawLine(): Unsupported surface format");
+    }
+
+    /* Perform clipping */
+    /* FIXME: We don't actually want to clip, as it may change line slope */
+    if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
+        return 0;
+    }
+
+    func(dst, x1, y1, x2, y2, color, SDL_TRUE);
+    return 0;
+}
+
+int
+SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
+              Uint32 color)
+{
+    int i;
+    int x1, y1;
+    int x2, y2;
+    SDL_bool draw_end;
+    DrawLineFunc func;
+
+    if (!dst) {
+        return SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
+    }
+
+    func = SDL_CalculateDrawLineFunc(dst->format);
+    if (!func) {
+        return SDL_SetError("SDL_DrawLines(): Unsupported surface format");
+    }
+
+    for (i = 1; i < count; ++i) {
+        x1 = points[i-1].x;
+        y1 = points[i-1].y;
+        x2 = points[i].x;
+        y2 = points[i].y;
+
+        /* Perform clipping */
+        /* FIXME: We don't actually want to clip, as it may change line slope */
+        if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
+            continue;
+        }
+
+        /* Draw the end if it was clipped */
+        draw_end = (x2 != points[i].x || y2 != points[i].y);
+
+        func(dst, x1, y1, x2, y2, color, draw_end);
+    }
+    if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
+        SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
+    }
+    return 0;
+}
+
+#endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_drawline.h

@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_drawline_h_
+#define SDL_drawline_h_
+
+#include "../../SDL_internal.h"
+
+
+extern int SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color);
+extern int SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count, Uint32 color);
+
+#endif /* SDL_drawline_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_drawpoint.c

@@ -0,0 +1,114 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
+
+#include "SDL_draw.h"
+#include "SDL_drawpoint.h"
+
+
+int
+SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
+{
+    if (!dst) {
+        return SDL_SetError("Passed NULL destination surface");
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        return SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
+    }
+
+    /* Perform clipping */
+    if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
+        x >= (dst->clip_rect.x + dst->clip_rect.w) ||
+        y >= (dst->clip_rect.y + dst->clip_rect.h)) {
+        return 0;
+    }
+
+    switch (dst->format->BytesPerPixel) {
+    case 1:
+        DRAW_FASTSETPIXELXY1(x, y);
+        break;
+    case 2:
+        DRAW_FASTSETPIXELXY2(x, y);
+        break;
+    case 3:
+        return SDL_Unsupported();
+    case 4:
+        DRAW_FASTSETPIXELXY4(x, y);
+        break;
+    }
+    return 0;
+}
+
+int
+SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
+               Uint32 color)
+{
+    int minx, miny;
+    int maxx, maxy;
+    int i;
+    int x, y;
+
+    if (!dst) {
+        return SDL_SetError("Passed NULL destination surface");
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        return SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
+    }
+
+    minx = dst->clip_rect.x;
+    maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
+    miny = dst->clip_rect.y;
+    maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
+
+    for (i = 0; i < count; ++i) {
+        x = points[i].x;
+        y = points[i].y;
+
+        if (x < minx || x > maxx || y < miny || y > maxy) {
+            continue;
+        }
+
+        switch (dst->format->BytesPerPixel) {
+        case 1:
+            DRAW_FASTSETPIXELXY1(x, y);
+            break;
+        case 2:
+            DRAW_FASTSETPIXELXY2(x, y);
+            break;
+        case 3:
+            return SDL_Unsupported();
+        case 4:
+            DRAW_FASTSETPIXELXY4(x, y);
+            break;
+        }
+    }
+    return 0;
+}
+
+#endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_drawpoint.h

@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_drawpoint_h_
+#define SDL_drawpoint_h_
+
+#include "../../SDL_internal.h"
+
+
+extern int SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color);
+extern int SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count, Uint32 color);
+
+#endif /* SDL_drawpoint_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_render_sw.c

@@ -0,0 +1,894 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
+
+#include "../SDL_sysrender.h"
+#include "SDL_render_sw_c.h"
+#include "SDL_hints.h"
+#include "SDL_assert.h"
+
+#include "SDL_draw.h"
+#include "SDL_blendfillrect.h"
+#include "SDL_blendline.h"
+#include "SDL_blendpoint.h"
+#include "SDL_drawline.h"
+#include "SDL_drawpoint.h"
+#include "SDL_rotate.h"
+
+/* SDL surface based renderer implementation */
+
+typedef struct
+{
+    const SDL_Rect *viewport;
+    const SDL_Rect *cliprect;
+    SDL_bool surface_cliprect_dirty;
+} SW_DrawStateCache;
+
+typedef struct
+{
+    SDL_Surface *surface;
+    SDL_Surface *window;
+} SW_RenderData;
+
+
+static SDL_Surface *
+SW_ActivateRenderer(SDL_Renderer * renderer)
+{
+    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
+
+    if (!data->surface) {
+        data->surface = data->window;
+    }
+    if (!data->surface) {
+        SDL_Surface *surface = SDL_GetWindowSurface(renderer->window);
+        if (surface) {
+            data->surface = data->window = surface;
+        }
+    }
+    return data->surface;
+}
+
+static void
+SW_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
+{
+    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
+
+    if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
+        data->surface = NULL;
+        data->window = NULL;
+    }
+}
+
+static int
+SW_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
+{
+    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
+
+    if (data->surface) {
+        if (w) {
+            *w = data->surface->w;
+        }
+        if (h) {
+            *h = data->surface->h;
+        }
+        return 0;
+    }
+
+    if (renderer->window) {
+        SDL_GetWindowSize(renderer->window, w, h);
+        return 0;
+    }
+
+    SDL_SetError("Software renderer doesn't have an output surface");
+    return -1;
+}
+
+static int
+SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    int bpp;
+    Uint32 Rmask, Gmask, Bmask, Amask;
+
+    if (!SDL_PixelFormatEnumToMasks
+        (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
+        return SDL_SetError("Unknown texture format");
+    }
+
+    texture->driverdata =
+        SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
+                             Bmask, Amask);
+    SDL_SetSurfaceColorMod(texture->driverdata, texture->r, texture->g,
+                           texture->b);
+    SDL_SetSurfaceAlphaMod(texture->driverdata, texture->a);
+    SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode);
+
+    /* Only RLE encode textures without an alpha channel since the RLE coder
+     * discards the color values of pixels with an alpha value of zero.
+     */
+    if (texture->access == SDL_TEXTUREACCESS_STATIC && !Amask) {
+        SDL_SetSurfaceRLE(texture->driverdata, 1);
+    }
+
+    if (!texture->driverdata) {
+        return -1;
+    }
+    return 0;
+}
+
+static int
+SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+                 const SDL_Rect * rect, const void *pixels, int pitch)
+{
+    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
+    Uint8 *src, *dst;
+    int row;
+    size_t length;
+
+    if(SDL_MUSTLOCK(surface))
+        SDL_LockSurface(surface);
+    src = (Uint8 *) pixels;
+    dst = (Uint8 *) surface->pixels +
+                        rect->y * surface->pitch +
+                        rect->x * surface->format->BytesPerPixel;
+    length = rect->w * surface->format->BytesPerPixel;
+    for (row = 0; row < rect->h; ++row) {
+        SDL_memcpy(dst, src, length);
+        src += pitch;
+        dst += surface->pitch;
+    }
+    if(SDL_MUSTLOCK(surface))
+        SDL_UnlockSurface(surface);
+    return 0;
+}
+
+static int
+SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+               const SDL_Rect * rect, void **pixels, int *pitch)
+{
+    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
+
+    *pixels =
+        (void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
+                  rect->x * surface->format->BytesPerPixel);
+    *pitch = surface->pitch;
+    return 0;
+}
+
+static void
+SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+}
+
+static void
+SW_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture, SDL_ScaleMode scaleMode)
+{
+}
+
+static int
+SW_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
+
+    if (texture) {
+        data->surface = (SDL_Surface *) texture->driverdata;
+    } else {
+        data->surface = data->window;
+    }
+    return 0;
+}
+
+static int
+SW_QueueSetViewport(SDL_Renderer * renderer, SDL_RenderCommand *cmd)
+{
+    return 0;  /* nothing to do in this backend. */
+}
+
+static int
+SW_QueueDrawPoints(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FPoint * points, int count)
+{
+    SDL_Point *verts = (SDL_Point *) SDL_AllocateRenderVertices(renderer, count * sizeof (SDL_Point), 0, &cmd->data.draw.first);
+    int i;
+
+    if (!verts) {
+        return -1;
+    }
+
+    cmd->data.draw.count = count;
+
+    if (renderer->viewport.x || renderer->viewport.y) {
+        const int x = renderer->viewport.x;
+        const int y = renderer->viewport.y;
+        for (i = 0; i < count; i++, verts++, points++) {
+            verts->x = (int)(x + points->x);
+            verts->y = (int)(y + points->y);
+        }
+    } else {
+        for (i = 0; i < count; i++, verts++, points++) {
+            verts->x = (int)points->x;
+            verts->y = (int)points->y;
+        }
+    }
+
+    return 0;
+}
+
+static int
+SW_QueueFillRects(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FRect * rects, int count)
+{
+    SDL_Rect *verts = (SDL_Rect *) SDL_AllocateRenderVertices(renderer, count * sizeof (SDL_Rect), 0, &cmd->data.draw.first);
+    int i;
+
+    if (!verts) {
+        return -1;
+    }
+
+    cmd->data.draw.count = count;
+
+    if (renderer->viewport.x || renderer->viewport.y) {
+        const int x = renderer->viewport.x;
+        const int y = renderer->viewport.y;
+
+        for (i = 0; i < count; i++, verts++, rects++) {
+            verts->x = (int)(x + rects->x);
+            verts->y = (int)(y + rects->y);
+            verts->w = SDL_max((int)rects->w, 1);
+            verts->h = SDL_max((int)rects->h, 1);
+        }
+    } else {
+        for (i = 0; i < count; i++, verts++, rects++) {
+            verts->x = (int)rects->x;
+            verts->y = (int)rects->y;
+            verts->w = SDL_max((int)rects->w, 1);
+            verts->h = SDL_max((int)rects->h, 1);
+        }
+    }
+
+    return 0;
+}
+
+static int
+SW_QueueCopy(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
+             const SDL_Rect * srcrect, const SDL_FRect * dstrect)
+{
+    SDL_Rect *verts = (SDL_Rect *) SDL_AllocateRenderVertices(renderer, 2 * sizeof (SDL_Rect), 0, &cmd->data.draw.first);
+
+    if (!verts) {
+        return -1;
+    }
+
+    cmd->data.draw.count = 1;
+
+    SDL_memcpy(verts, srcrect, sizeof (SDL_Rect));
+    verts++;
+
+    if (renderer->viewport.x || renderer->viewport.y) {
+        verts->x = (int)(renderer->viewport.x + dstrect->x);
+        verts->y = (int)(renderer->viewport.y + dstrect->y);
+    } else {
+        verts->x = (int)dstrect->x;
+        verts->y = (int)dstrect->y;
+    }
+    verts->w = (int)dstrect->w;
+    verts->h = (int)dstrect->h;
+
+    return 0;
+}
+
+typedef struct CopyExData
+{
+    SDL_Rect srcrect;
+    SDL_Rect dstrect;
+    double angle;
+    SDL_FPoint center;
+    SDL_RendererFlip flip;
+} CopyExData;
+
+static int
+SW_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
+               const SDL_Rect * srcrect, const SDL_FRect * dstrect,
+               const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
+{
+    CopyExData *verts = (CopyExData *) SDL_AllocateRenderVertices(renderer, sizeof (CopyExData), 0, &cmd->data.draw.first);
+
+    if (!verts) {
+        return -1;
+    }
+
+    cmd->data.draw.count = 1;
+
+    SDL_memcpy(&verts->srcrect, srcrect, sizeof (SDL_Rect));
+
+    if (renderer->viewport.x || renderer->viewport.y) {
+        verts->dstrect.x = (int)(renderer->viewport.x + dstrect->x);
+        verts->dstrect.y = (int)(renderer->viewport.y + dstrect->y);
+    } else {
+        verts->dstrect.x = (int)dstrect->x;
+        verts->dstrect.y = (int)dstrect->y;
+    }
+    verts->dstrect.w = (int)dstrect->w;
+    verts->dstrect.h = (int)dstrect->h;
+    verts->angle = angle;
+    SDL_memcpy(&verts->center, center, sizeof (SDL_FPoint));
+    verts->flip = flip;
+
+    return 0;
+}
+
+static int
+SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Surface *surface, SDL_Texture * texture,
+                const SDL_Rect * srcrect, const SDL_Rect * final_rect,
+                const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip)
+{
+    SDL_Surface *src = (SDL_Surface *) texture->driverdata;
+    SDL_Rect tmp_rect;
+    SDL_Surface *src_clone, *src_rotated, *src_scaled;
+    SDL_Surface *mask = NULL, *mask_rotated = NULL;
+    int retval = 0, dstwidth, dstheight, abscenterx, abscentery;
+    double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
+    SDL_BlendMode blendmode;
+    Uint8 alphaMod, rMod, gMod, bMod;
+    int applyModulation = SDL_FALSE;
+    int blitRequired = SDL_FALSE;
+    int isOpaque = SDL_FALSE;
+
+    if (!surface) {
+        return -1;
+    }
+
+    tmp_rect.x = 0;
+    tmp_rect.y = 0;
+    tmp_rect.w = final_rect->w;
+    tmp_rect.h = final_rect->h;
+
+    /* It is possible to encounter an RLE encoded surface here and locking it is
+     * necessary because this code is going to access the pixel buffer directly.
+     */
+    if (SDL_MUSTLOCK(src)) {
+        SDL_LockSurface(src);
+    }
+
+    /* Clone the source surface but use its pixel buffer directly.
+     * The original source surface must be treated as read-only.
+     */
+    src_clone = SDL_CreateRGBSurfaceFrom(src->pixels, src->w, src->h, src->format->BitsPerPixel, src->pitch,
+                                         src->format->Rmask, src->format->Gmask,
+                                         src->format->Bmask, src->format->Amask);
+    if (src_clone == NULL) {
+        if (SDL_MUSTLOCK(src)) {
+            SDL_UnlockSurface(src);
+        }
+        return -1;
+    }
+
+    SDL_GetSurfaceBlendMode(src, &blendmode);
+    SDL_GetSurfaceAlphaMod(src, &alphaMod);
+    SDL_GetSurfaceColorMod(src, &rMod, &gMod, &bMod);
+
+    /* SDLgfx_rotateSurface only accepts 32-bit surfaces with a 8888 layout. Everything else has to be converted. */
+    if (src->format->BitsPerPixel != 32 || SDL_PIXELLAYOUT(src->format->format) != SDL_PACKEDLAYOUT_8888 || !src->format->Amask) {
+        blitRequired = SDL_TRUE;
+    }
+
+    /* If scaling and cropping is necessary, it has to be taken care of before the rotation. */
+    if (!(srcrect->w == final_rect->w && srcrect->h == final_rect->h && srcrect->x == 0 && srcrect->y == 0)) {
+        blitRequired = SDL_TRUE;
+    }
+
+    /* srcrect is not selecting the whole src surface, so cropping is needed */
+    if (!(srcrect->w == src->w && srcrect->h == src->h && srcrect->x == 0 && srcrect->y == 0)) {
+        blitRequired = SDL_TRUE;
+    }
+
+    /* The color and alpha modulation has to be applied before the rotation when using the NONE, MOD or MUL blend modes. */
+    if ((blendmode == SDL_BLENDMODE_NONE || blendmode == SDL_BLENDMODE_MOD || blendmode == SDL_BLENDMODE_MUL) && (alphaMod & rMod & gMod & bMod) != 255) {
+        applyModulation = SDL_TRUE;
+        SDL_SetSurfaceAlphaMod(src_clone, alphaMod);
+        SDL_SetSurfaceColorMod(src_clone, rMod, gMod, bMod);
+    }
+
+    /* Opaque surfaces are much easier to handle with the NONE blend mode. */
+    if (blendmode == SDL_BLENDMODE_NONE && !src->format->Amask && alphaMod == 255) {
+        isOpaque = SDL_TRUE;
+    }
+
+    /* The NONE blend mode requires a mask for non-opaque surfaces. This mask will be used
+     * to clear the pixels in the destination surface. The other steps are explained below.
+     */
+    if (blendmode == SDL_BLENDMODE_NONE && !isOpaque) {
+        mask = SDL_CreateRGBSurface(0, final_rect->w, final_rect->h, 32,
+                                    0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
+        if (mask == NULL) {
+            retval = -1;
+        } else {
+            SDL_SetSurfaceBlendMode(mask, SDL_BLENDMODE_MOD);
+        }
+    }
+
+    /* Create a new surface should there be a format mismatch or if scaling, cropping,
+     * or modulation is required. It's possible to use the source surface directly otherwise.
+     */
+    if (!retval && (blitRequired || applyModulation)) {
+        SDL_Rect scale_rect = tmp_rect;
+        src_scaled = SDL_CreateRGBSurface(0, final_rect->w, final_rect->h, 32,
+                                          0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
+        if (src_scaled == NULL) {
+            retval = -1;
+        } else {
+            SDL_SetSurfaceBlendMode(src_clone, SDL_BLENDMODE_NONE);
+            retval = SDL_BlitScaled(src_clone, srcrect, src_scaled, &scale_rect);
+            SDL_FreeSurface(src_clone);
+            src_clone = src_scaled;
+            src_scaled = NULL;
+        }
+    }
+
+    /* SDLgfx_rotateSurface is going to make decisions depending on the blend mode. */
+    SDL_SetSurfaceBlendMode(src_clone, blendmode);
+
+    if (!retval) {
+        SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, angle, &dstwidth, &dstheight, &cangle, &sangle);
+        src_rotated = SDLgfx_rotateSurface(src_clone, angle, dstwidth/2, dstheight/2, (texture->scaleMode == SDL_ScaleModeNearest) ? 0 : 1, flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
+        if (src_rotated == NULL) {
+            retval = -1;
+        }
+        if (!retval && mask != NULL) {
+            /* The mask needed for the NONE blend mode gets rotated with the same parameters. */
+            mask_rotated = SDLgfx_rotateSurface(mask, angle, dstwidth/2, dstheight/2, SDL_FALSE, 0, 0, dstwidth, dstheight, cangle, sangle);
+            if (mask_rotated == NULL) {
+                retval = -1;
+            }
+        }
+        if (!retval) {
+            /* Find out where the new origin is by rotating the four final_rect points around the center and then taking the extremes */
+            abscenterx = final_rect->x + (int)center->x;
+            abscentery = final_rect->y + (int)center->y;
+            /* Compensate the angle inversion to match the behaviour of the other backends */
+            sangle = -sangle;
+
+            /* Top Left */
+            px = final_rect->x - abscenterx;
+            py = final_rect->y - abscentery;
+            p1x = px * cangle - py * sangle + abscenterx;
+            p1y = px * sangle + py * cangle + abscentery;
+
+            /* Top Right */
+            px = final_rect->x + final_rect->w - abscenterx;
+            py = final_rect->y - abscentery;
+            p2x = px * cangle - py * sangle + abscenterx;
+            p2y = px * sangle + py * cangle + abscentery;
+
+            /* Bottom Left */
+            px = final_rect->x - abscenterx;
+            py = final_rect->y + final_rect->h - abscentery;
+            p3x = px * cangle - py * sangle + abscenterx;
+            p3y = px * sangle + py * cangle + abscentery;
+
+            /* Bottom Right */
+            px = final_rect->x + final_rect->w - abscenterx;
+            py = final_rect->y + final_rect->h - abscentery;
+            p4x = px * cangle - py * sangle + abscenterx;
+            p4y = px * sangle + py * cangle + abscentery;
+
+            tmp_rect.x = (int)MIN(MIN(p1x, p2x), MIN(p3x, p4x));
+            tmp_rect.y = (int)MIN(MIN(p1y, p2y), MIN(p3y, p4y));
+            tmp_rect.w = dstwidth;
+            tmp_rect.h = dstheight;
+
+            /* The NONE blend mode needs some special care with non-opaque surfaces.
+             * Other blend modes or opaque surfaces can be blitted directly.
+             */
+            if (blendmode != SDL_BLENDMODE_NONE || isOpaque) {
+                if (applyModulation == SDL_FALSE) {
+                    /* If the modulation wasn't already applied, make it happen now. */
+                    SDL_SetSurfaceAlphaMod(src_rotated, alphaMod);
+                    SDL_SetSurfaceColorMod(src_rotated, rMod, gMod, bMod);
+                }
+                retval = SDL_BlitSurface(src_rotated, NULL, surface, &tmp_rect);
+            } else {
+                /* The NONE blend mode requires three steps to get the pixels onto the destination surface.
+                 * First, the area where the rotated pixels will be blitted to get set to zero.
+                 * This is accomplished by simply blitting a mask with the NONE blend mode.
+                 * The colorkey set by the rotate function will discard the correct pixels.
+                 */
+                SDL_Rect mask_rect = tmp_rect;
+                SDL_SetSurfaceBlendMode(mask_rotated, SDL_BLENDMODE_NONE);
+                retval = SDL_BlitSurface(mask_rotated, NULL, surface, &mask_rect);
+                if (!retval) {
+                    /* The next step copies the alpha value. This is done with the BLEND blend mode and
+                     * by modulating the source colors with 0. Since the destination is all zeros, this
+                     * will effectively set the destination alpha to the source alpha.
+                     */
+                    SDL_SetSurfaceColorMod(src_rotated, 0, 0, 0);
+                    mask_rect = tmp_rect;
+                    retval = SDL_BlitSurface(src_rotated, NULL, surface, &mask_rect);
+                    if (!retval) {
+                        /* The last step gets the color values in place. The ADD blend mode simply adds them to
+                         * the destination (where the color values are all zero). However, because the ADD blend
+                         * mode modulates the colors with the alpha channel, a surface without an alpha mask needs
+                         * to be created. This makes all source pixels opaque and the colors get copied correctly.
+                         */
+                        SDL_Surface *src_rotated_rgb;
+                        src_rotated_rgb = SDL_CreateRGBSurfaceFrom(src_rotated->pixels, src_rotated->w, src_rotated->h,
+                                                                   src_rotated->format->BitsPerPixel, src_rotated->pitch,
+                                                                   src_rotated->format->Rmask, src_rotated->format->Gmask,
+                                                                   src_rotated->format->Bmask, 0);
+                        if (src_rotated_rgb == NULL) {
+                            retval = -1;
+                        } else {
+                            SDL_SetSurfaceBlendMode(src_rotated_rgb, SDL_BLENDMODE_ADD);
+                            retval = SDL_BlitSurface(src_rotated_rgb, NULL, surface, &tmp_rect);
+                            SDL_FreeSurface(src_rotated_rgb);
+                        }
+                    }
+                }
+                SDL_FreeSurface(mask_rotated);
+            }
+            if (src_rotated != NULL) {
+                SDL_FreeSurface(src_rotated);
+            }
+        }
+    }
+
+    if (SDL_MUSTLOCK(src)) {
+        SDL_UnlockSurface(src);
+    }
+    if (mask != NULL) {
+        SDL_FreeSurface(mask);
+    }
+    if (src_clone != NULL) {
+        SDL_FreeSurface(src_clone);
+    }
+    return retval;
+}
+
+static void
+PrepTextureForCopy(const SDL_RenderCommand *cmd)
+{
+    const Uint8 r = cmd->data.draw.r;
+    const Uint8 g = cmd->data.draw.g;
+    const Uint8 b = cmd->data.draw.b;
+    const Uint8 a = cmd->data.draw.a;
+    const SDL_BlendMode blend = cmd->data.draw.blend;
+    SDL_Texture *texture = cmd->data.draw.texture;
+    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
+    const SDL_bool colormod = ((r & g & b) != 0xFF);
+    const SDL_bool alphamod = (a != 0xFF);
+    const SDL_bool blending = ((blend == SDL_BLENDMODE_ADD) || (blend == SDL_BLENDMODE_MOD) || (blend == SDL_BLENDMODE_MUL));
+
+    if (colormod || alphamod || blending) {
+        SDL_SetSurfaceRLE(surface, 0);
+    }
+
+    /* !!! FIXME: we can probably avoid some of these calls. */
+    SDL_SetSurfaceColorMod(surface, r, g, b);
+    SDL_SetSurfaceAlphaMod(surface, a);
+    SDL_SetSurfaceBlendMode(surface, blend);
+}
+
+static void
+SetDrawState(SDL_Surface *surface, SW_DrawStateCache *drawstate)
+{
+    if (drawstate->surface_cliprect_dirty) {
+        const SDL_Rect *viewport = drawstate->viewport;
+        const SDL_Rect *cliprect = drawstate->cliprect;
+        SDL_assert(viewport != NULL);  /* the higher level should have forced a SDL_RENDERCMD_SETVIEWPORT */
+
+        if (cliprect != NULL) {
+            SDL_Rect clip_rect;
+            clip_rect.x = cliprect->x + viewport->x;
+            clip_rect.y = cliprect->y + viewport->y;
+            clip_rect.w = cliprect->w;
+            clip_rect.h = cliprect->h;
+            SDL_IntersectRect(viewport, &clip_rect, &clip_rect);
+            SDL_SetClipRect(surface, &clip_rect);
+        } else {
+            SDL_SetClipRect(surface, drawstate->viewport);
+        }
+        drawstate->surface_cliprect_dirty = SDL_FALSE;
+    }
+}
+
+static int
+SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize)
+{
+    SDL_Surface *surface = SW_ActivateRenderer(renderer);
+    SW_DrawStateCache drawstate;
+
+    if (!surface) {
+        return -1;
+    }
+
+    drawstate.viewport = NULL;
+    drawstate.cliprect = NULL;
+    drawstate.surface_cliprect_dirty = SDL_TRUE;
+
+    while (cmd) {
+        switch (cmd->command) {
+            case SDL_RENDERCMD_SETDRAWCOLOR: {
+                break;  /* Not used in this backend. */
+            }
+
+            case SDL_RENDERCMD_SETVIEWPORT: {
+                drawstate.viewport = &cmd->data.viewport.rect;
+                drawstate.surface_cliprect_dirty = SDL_TRUE;
+                break;
+            }
+
+            case SDL_RENDERCMD_SETCLIPRECT: {
+                drawstate.cliprect = cmd->data.cliprect.enabled ? &cmd->data.cliprect.rect : NULL;                
+                drawstate.surface_cliprect_dirty = SDL_TRUE;
+                break;
+            }
+
+            case SDL_RENDERCMD_CLEAR: {
+                const Uint8 r = cmd->data.color.r;
+                const Uint8 g = cmd->data.color.g;
+                const Uint8 b = cmd->data.color.b;
+                const Uint8 a = cmd->data.color.a;
+                /* By definition the clear ignores the clip rect */
+                SDL_SetClipRect(surface, NULL);
+                SDL_FillRect(surface, NULL, SDL_MapRGBA(surface->format, r, g, b, a));
+                drawstate.surface_cliprect_dirty = SDL_TRUE;
+                break;
+            }
+
+            case SDL_RENDERCMD_DRAW_POINTS: {
+                const Uint8 r = cmd->data.draw.r;
+                const Uint8 g = cmd->data.draw.g;
+                const Uint8 b = cmd->data.draw.b;
+                const Uint8 a = cmd->data.draw.a;
+                const int count = (int) cmd->data.draw.count;
+                const SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first);
+                const SDL_BlendMode blend = cmd->data.draw.blend;
+                SetDrawState(surface, &drawstate);
+                if (blend == SDL_BLENDMODE_NONE) {
+                    SDL_DrawPoints(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
+                } else {
+                    SDL_BlendPoints(surface, verts, count, blend, r, g, b, a);
+                }
+                break;
+            }
+
+            case SDL_RENDERCMD_DRAW_LINES: {
+                const Uint8 r = cmd->data.draw.r;
+                const Uint8 g = cmd->data.draw.g;
+                const Uint8 b = cmd->data.draw.b;
+                const Uint8 a = cmd->data.draw.a;
+                const int count = (int) cmd->data.draw.count;
+                const SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first);
+                const SDL_BlendMode blend = cmd->data.draw.blend;
+                SetDrawState(surface, &drawstate);
+                if (blend == SDL_BLENDMODE_NONE) {
+                    SDL_DrawLines(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
+                } else {
+                    SDL_BlendLines(surface, verts, count, blend, r, g, b, a);
+                }
+                break;
+            }
+
+            case SDL_RENDERCMD_FILL_RECTS: {
+                const Uint8 r = cmd->data.draw.r;
+                const Uint8 g = cmd->data.draw.g;
+                const Uint8 b = cmd->data.draw.b;
+                const Uint8 a = cmd->data.draw.a;
+                const int count = (int) cmd->data.draw.count;
+                const SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first);
+                const SDL_BlendMode blend = cmd->data.draw.blend;
+                SetDrawState(surface, &drawstate);
+                if (blend == SDL_BLENDMODE_NONE) {
+                    SDL_FillRects(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
+                } else {
+                    SDL_BlendFillRects(surface, verts, count, blend, r, g, b, a);
+                }
+                break;
+            }
+
+            case SDL_RENDERCMD_COPY: {
+                SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first);
+                const SDL_Rect *srcrect = verts;
+                SDL_Rect *dstrect = verts + 1;
+                SDL_Texture *texture = cmd->data.draw.texture;
+                SDL_Surface *src = (SDL_Surface *) texture->driverdata;
+
+                SetDrawState(surface, &drawstate);
+
+                PrepTextureForCopy(cmd);
+
+                if ( srcrect->w == dstrect->w && srcrect->h == dstrect->h ) {
+                    SDL_BlitSurface(src, srcrect, surface, dstrect);
+                } else {
+                    /* If scaling is ever done, permanently disable RLE (which doesn't support scaling)
+                     * to avoid potentially frequent RLE encoding/decoding.
+                     */
+                    SDL_SetSurfaceRLE(surface, 0);
+                    SDL_BlitScaled(src, srcrect, surface, dstrect);
+                }
+                break;
+            }
+
+            case SDL_RENDERCMD_COPY_EX: {
+                const CopyExData *copydata = (CopyExData *) (((Uint8 *) vertices) + cmd->data.draw.first);
+                SetDrawState(surface, &drawstate);
+                PrepTextureForCopy(cmd);
+                SW_RenderCopyEx(renderer, surface, cmd->data.draw.texture, &copydata->srcrect,
+                                &copydata->dstrect, copydata->angle, &copydata->center, copydata->flip);
+                break;
+            }
+
+            case SDL_RENDERCMD_NO_OP:
+                break;
+        }
+
+        cmd = cmd->next;
+    }
+
+    return 0;
+}
+
+static int
+SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
+                    Uint32 format, void * pixels, int pitch)
+{
+    SDL_Surface *surface = SW_ActivateRenderer(renderer);
+    Uint32 src_format;
+    void *src_pixels;
+
+    if (!surface) {
+        return -1;
+    }
+
+    /* NOTE: The rect is already adjusted according to the viewport by
+     * SDL_RenderReadPixels.
+     */
+
+    if (rect->x < 0 || rect->x+rect->w > surface->w ||
+        rect->y < 0 || rect->y+rect->h > surface->h) {
+        return SDL_SetError("Tried to read outside of surface bounds");
+    }
+
+    src_format = surface->format->format;
+    src_pixels = (void*)((Uint8 *) surface->pixels +
+                    rect->y * surface->pitch +
+                    rect->x * surface->format->BytesPerPixel);
+
+    return SDL_ConvertPixels(rect->w, rect->h,
+                             src_format, src_pixels, surface->pitch,
+                             format, pixels, pitch);
+}
+
+static void
+SW_RenderPresent(SDL_Renderer * renderer)
+{
+    SDL_Window *window = renderer->window;
+
+    if (window) {
+        SDL_UpdateWindowSurface(window);
+    }
+}
+
+static void
+SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
+
+    SDL_FreeSurface(surface);
+}
+
+static void
+SW_DestroyRenderer(SDL_Renderer * renderer)
+{
+    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
+
+    SDL_free(data);
+    SDL_free(renderer);
+}
+
+SDL_Renderer *
+SW_CreateRendererForSurface(SDL_Surface * surface)
+{
+    SDL_Renderer *renderer;
+    SW_RenderData *data;
+
+    if (!surface) {
+        SDL_SetError("Can't create renderer for NULL surface");
+        return NULL;
+    }
+
+    renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
+    if (!renderer) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    data = (SW_RenderData *) SDL_calloc(1, sizeof(*data));
+    if (!data) {
+        SW_DestroyRenderer(renderer);
+        SDL_OutOfMemory();
+        return NULL;
+    }
+    data->surface = surface;
+    data->window = surface;
+
+    renderer->WindowEvent = SW_WindowEvent;
+    renderer->GetOutputSize = SW_GetOutputSize;
+    renderer->CreateTexture = SW_CreateTexture;
+    renderer->UpdateTexture = SW_UpdateTexture;
+    renderer->LockTexture = SW_LockTexture;
+    renderer->UnlockTexture = SW_UnlockTexture;
+    renderer->SetTextureScaleMode = SW_SetTextureScaleMode;
+    renderer->SetRenderTarget = SW_SetRenderTarget;
+    renderer->QueueSetViewport = SW_QueueSetViewport;
+    renderer->QueueSetDrawColor = SW_QueueSetViewport;  /* SetViewport and SetDrawColor are (currently) no-ops. */
+    renderer->QueueDrawPoints = SW_QueueDrawPoints;
+    renderer->QueueDrawLines = SW_QueueDrawPoints;  /* lines and points queue vertices the same way. */
+    renderer->QueueFillRects = SW_QueueFillRects;
+    renderer->QueueCopy = SW_QueueCopy;
+    renderer->QueueCopyEx = SW_QueueCopyEx;
+    renderer->RunCommandQueue = SW_RunCommandQueue;
+    renderer->RenderReadPixels = SW_RenderReadPixels;
+    renderer->RenderPresent = SW_RenderPresent;
+    renderer->DestroyTexture = SW_DestroyTexture;
+    renderer->DestroyRenderer = SW_DestroyRenderer;
+    renderer->info = SW_RenderDriver.info;
+    renderer->driverdata = data;
+
+    SW_ActivateRenderer(renderer);
+
+    return renderer;
+}
+
+static SDL_Renderer *
+SW_CreateRenderer(SDL_Window * window, Uint32 flags)
+{
+    SDL_Surface *surface;
+
+    surface = SDL_GetWindowSurface(window);
+    if (!surface) {
+        return NULL;
+    }
+    return SW_CreateRendererForSurface(surface);
+}
+
+SDL_RenderDriver SW_RenderDriver = {
+    SW_CreateRenderer,
+    {
+     "software",
+     SDL_RENDERER_SOFTWARE | SDL_RENDERER_TARGETTEXTURE,
+     8,
+     {
+      SDL_PIXELFORMAT_ARGB8888,
+      SDL_PIXELFORMAT_ABGR8888,
+      SDL_PIXELFORMAT_RGBA8888,
+      SDL_PIXELFORMAT_BGRA8888,
+      SDL_PIXELFORMAT_RGB888,
+      SDL_PIXELFORMAT_BGR888,
+      SDL_PIXELFORMAT_RGB565,
+      SDL_PIXELFORMAT_RGB555
+     },
+     0,
+     0}
+};
+
+#endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_render_sw_c.h

@@ -0,0 +1,29 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_render_sw_c_h_
+#define SDL_render_sw_c_h_
+
+extern SDL_Renderer * SW_CreateRendererForSurface(SDL_Surface * surface);
+
+#endif /* SDL_render_sw_c_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */

externals/SDL/src/render/software/SDL_rotate.c

@@ -0,0 +1,538 @@
+/*
+
+SDL_rotate.c: rotates 32bit or 8bit surfaces
+
+Shamelessly stolen from SDL_gfx by Andreas Schiffler. Original copyright follows:
+
+Copyright (C) 2001-2011  Andreas Schiffler
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+   1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+
+   2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+
+   3. This notice may not be removed or altered from any source
+   distribution.
+
+Andreas Schiffler -- aschiffler at ferzkopp dot net
+
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
+
+#if defined(__WIN32__)
+#include "../../core/windows/SDL_windows.h"
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "SDL.h"
+#include "SDL_rotate.h"
+
+/* ---- Internally used structures */
+
+/* !
+\brief A 32 bit RGBA pixel.
+*/
+typedef struct tColorRGBA {
+    Uint8 r;
+    Uint8 g;
+    Uint8 b;
+    Uint8 a;
+} tColorRGBA;
+
+/* !
+\brief A 8bit Y/palette pixel.
+*/
+typedef struct tColorY {
+    Uint8 y;
+} tColorY;
+
+/* !
+\brief Returns maximum of two numbers a and b.
+*/
+#define MAX(a,b)    (((a) > (b)) ? (a) : (b))
+
+/* !
+\brief Number of guard rows added to destination surfaces.
+
+This is a simple but effective workaround for observed issues.
+These rows allocate extra memory and are then hidden from the surface.
+Rows are added to the end of destination surfaces when they are allocated.
+This catches any potential overflows which seem to happen with
+just the right src image dimensions and scale/rotation and can lead
+to a situation where the program can segfault.
+*/
+#define GUARD_ROWS (2)
+
+/* !
+\brief Returns colorkey info for a surface
+*/
+static Uint32
+_colorkey(SDL_Surface *src)
+{
+    Uint32 key = 0;
+    if (SDL_HasColorKey(src)) {
+        SDL_GetColorKey(src, &key);
+    }
+    return key;
+}
+
+
+/* !
+\brief Internal target surface sizing function for rotations with trig result return.
+
+\param width The source surface width.
+\param height The source surface height.
+\param angle The angle to rotate in degrees.
+\param dstwidth The calculated width of the destination surface.
+\param dstheight The calculated height of the destination surface.
+\param cangle The sine of the angle
+\param sangle The cosine of the angle
+
+*/
+void
+SDLgfx_rotozoomSurfaceSizeTrig(int width, int height, double angle,
+                               int *dstwidth, int *dstheight,
+                               double *cangle, double *sangle)
+{
+    /* The trig code below gets the wrong size (due to FP inaccuracy?) when angle is a multiple of 90 degrees */
+    int angle90 = (int)(angle/90);
+    if(angle90 == angle/90) { /* if the angle is a multiple of 90 degrees */
+        angle90 %= 4;
+        if(angle90 < 0) angle90 += 4; /* 0:0 deg, 1:90 deg, 2:180 deg, 3:270 deg */
+        if(angle90 & 1) {
+            *dstwidth  = height;
+            *dstheight = width;
+            *cangle = 0;
+            *sangle = angle90 == 1 ? -1 : 1; /* reversed because our rotations are clockwise */
+        } else {
+            *dstwidth  = width;
+            *dstheight = height;
+            *cangle = angle90 == 0 ? 1 : -1;
+            *sangle = 0;
+        }
+    } else {
+        double x, y, cx, cy, sx, sy;
+        double radangle;
+        int dstwidthhalf, dstheighthalf;
+        /*
+        * Determine destination width and height by rotating a centered source box
+        */
+        radangle = angle * (M_PI / -180.0); /* reverse the angle because our rotations are clockwise */
+        *sangle = SDL_sin(radangle);
+        *cangle = SDL_cos(radangle);
+        x = (double)(width / 2);
+        y = (double)(height / 2);
+        cx = *cangle * x;
+        cy = *cangle * y;
+        sx = *sangle * x;
+        sy = *sangle * y;
+
+        dstwidthhalf = MAX((int)
+            SDL_ceil(MAX(MAX(MAX(SDL_fabs(cx + sy), SDL_fabs(cx - sy)), SDL_fabs(-cx + sy)), SDL_fabs(-cx - sy))), 1);
+        dstheighthalf = MAX((int)
+            SDL_ceil(MAX(MAX(MAX(SDL_fabs(sx + cy), SDL_fabs(sx - cy)), SDL_fabs(-sx + cy)), SDL_fabs(-sx - cy))), 1);
+        *dstwidth = 2 * dstwidthhalf;
+        *dstheight = 2 * dstheighthalf;
+    }
+}
+
+/* Computes source pointer X/Y increments for a rotation that's a multiple of 90 degrees. */
+static void
+computeSourceIncrements90(SDL_Surface * src, int bpp, int angle, int flipx, int flipy,
+                          int *sincx, int *sincy, int *signx, int *signy)
+{
+    int pitch = flipy ? -src->pitch : src->pitch;
+    if (flipx) {
+        bpp = -bpp;
+    }
+    switch (angle) { /* 0:0 deg, 1:90 deg, 2:180 deg, 3:270 deg */
+    case 0: *sincx = bpp; *sincy = pitch - src->w * *sincx; *signx = *signy = 1; break;
+    case 1: *sincx = -pitch; *sincy = bpp - *sincx * src->h; *signx = 1; *signy = -1; break;
+    case 2: *sincx = -bpp; *sincy = -src->w * *sincx - pitch; *signx = *signy = -1; break;
+    case 3: default: *sincx = pitch; *sincy = -*sincx * src->h - bpp; *signx = -1; *signy = 1; break;
+    }
+    if (flipx) {
+        *signx = -*signx;
+    }
+    if (flipy) {
+        *signy = -*signy;
+    }
+}
+
+/* Performs a relatively fast rotation/flip when the angle is a multiple of 90 degrees. */
+#define TRANSFORM_SURFACE_90(pixelType) \
+    int dy, dincy = dst->pitch - dst->w*sizeof(pixelType), sincx, sincy, signx, signy;                      \
+    Uint8 *sp = (Uint8*)src->pixels, *dp = (Uint8*)dst->pixels, *de;                                        \
+                                                                                                            \
+    computeSourceIncrements90(src, sizeof(pixelType), angle, flipx, flipy, &sincx, &sincy, &signx, &signy); \
+    if (signx < 0) sp += (src->w-1)*sizeof(pixelType);                                                      \
+    if (signy < 0) sp += (src->h-1)*src->pitch;                                                             \
+                                                                                                            \
+    for (dy = 0; dy < dst->h; sp += sincy, dp += dincy, dy++) {                                             \
+        if (sincx == sizeof(pixelType)) { /* if advancing src and dest equally, use memcpy */               \
+            SDL_memcpy(dp, sp, dst->w*sizeof(pixelType));                                                   \
+            sp += dst->w*sizeof(pixelType);                                                                 \
+            dp += dst->w*sizeof(pixelType);                                                                 \
+        } else {                                                                                            \
+            for (de = dp + dst->w*sizeof(pixelType); dp != de; sp += sincx, dp += sizeof(pixelType)) {      \
+                *(pixelType*)dp = *(pixelType*)sp;                                                          \
+            }                                                                                               \
+        }                                                                                                   \
+    }
+
+static void
+transformSurfaceRGBA90(SDL_Surface * src, SDL_Surface * dst, int angle, int flipx, int flipy)
+{
+    TRANSFORM_SURFACE_90(tColorRGBA);
+}
+
+static void
+transformSurfaceY90(SDL_Surface * src, SDL_Surface * dst, int angle, int flipx, int flipy)
+{
+    TRANSFORM_SURFACE_90(tColorY);
+}
+
+#undef TRANSFORM_SURFACE_90
+
+/* !
+\brief Internal 32 bit rotozoomer with optional anti-aliasing.
+
+Rotates and zooms 32 bit RGBA/ABGR 'src' surface to 'dst' surface based on the control
+parameters by scanning the destination surface and applying optionally anti-aliasing
+by bilinear interpolation.
+Assumes src and dst surfaces are of 32 bit depth.
+Assumes dst surface was allocated with the correct dimensions.
+
+\param src Source surface.
+\param dst Destination surface.
+\param cx Horizontal center coordinate.
+\param cy Vertical center coordinate.
+\param isin Integer version of sine of angle.
+\param icos Integer version of cosine of angle.
+\param flipx Flag indicating horizontal mirroring should be applied.
+\param flipy Flag indicating vertical mirroring should be applied.
+\param smooth Flag indicating anti-aliasing should be used.
+*/
+static void
+_transformSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos, int flipx, int flipy, int smooth)
+{
+    int x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
+    tColorRGBA c00, c01, c10, c11, cswap;
+    tColorRGBA *pc, *sp;
+    int gap;
+
+    /*
+    * Variable setup
+    */
+    xd = ((src->w - dst->w) << 15);
+    yd = ((src->h - dst->h) << 15);
+    ax = (cx << 16) - (icos * cx);
+    ay = (cy << 16) - (isin * cx);
+    sw = src->w - 1;
+    sh = src->h - 1;
+    pc = (tColorRGBA*) dst->pixels;
+    gap = dst->pitch - dst->w * 4;
+
+    /*
+    * Switch between interpolating and non-interpolating code
+    */
+    if (smooth) {
+        for (y = 0; y < dst->h; y++) {
+            dy = cy - y;
+            sdx = (ax + (isin * dy)) + xd;
+            sdy = (ay - (icos * dy)) + yd;
+            for (x = 0; x < dst->w; x++) {
+                dx = (sdx >> 16);
+                dy = (sdy >> 16);
+                if (flipx) dx = sw - dx;
+                if (flipy) dy = sh - dy;
+                if ((dx > -1) && (dy > -1) && (dx < (src->w-1)) && (dy < (src->h-1))) {
+                    sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy) + dx;
+                    c00 = *sp;
+                    sp += 1;
+                    c01 = *sp;
+                    sp += (src->pitch/4);
+                    c11 = *sp;
+                    sp -= 1;
+                    c10 = *sp;
+                    if (flipx) {
+                        cswap = c00; c00=c01; c01=cswap;
+                        cswap = c10; c10=c11; c11=cswap;
+                    }
+                    if (flipy) {
+                        cswap = c00; c00=c10; c10=cswap;
+                        cswap = c01; c01=c11; c11=cswap;
+                    }
+                    /*
+                    * Interpolate colors
+                    */
+                    ex = (sdx & 0xffff);
+                    ey = (sdy & 0xffff);
+                    t1 = ((((c01.r - c00.r) * ex) >> 16) + c00.r) & 0xff;
+                    t2 = ((((c11.r - c10.r) * ex) >> 16) + c10.r) & 0xff;
+                    pc->r = (((t2 - t1) * ey) >> 16) + t1;
+                    t1 = ((((c01.g - c00.g) * ex) >> 16) + c00.g) & 0xff;
+                    t2 = ((((c11.g - c10.g) * ex) >> 16) + c10.g) & 0xff;
+                    pc->g = (((t2 - t1) * ey) >> 16) + t1;
+                    t1 = ((((c01.b - c00.b) * ex) >> 16) + c00.b) & 0xff;
+                    t2 = ((((c11.b - c10.b) * ex) >> 16) + c10.b) & 0xff;
+                    pc->b = (((t2 - t1) * ey) >> 16) + t1;
+                    t1 = ((((c01.a - c00.a) * ex) >> 16) + c00.a) & 0xff;
+                    t2 = ((((c11.a - c10.a) * ex) >> 16) + c10.a) & 0xff;
+                    pc->a = (((t2 - t1) * ey) >> 16) + t1;
+                }
+                sdx += icos;
+                sdy += isin;
+                pc++;
+            }
+            pc = (tColorRGBA *) ((Uint8 *) pc + gap);
+        }
+    } else {
+        for (y = 0; y < dst->h; y++) {
+            dy = cy - y;
+            sdx = (ax + (isin * dy)) + xd;
+            sdy = (ay - (icos * dy)) + yd;
+            for (x = 0; x < dst->w; x++) {
+                dx = (sdx >> 16);
+                dy = (sdy >> 16);
+                if ((unsigned)dx < (unsigned)src->w && (unsigned)dy < (unsigned)src->h) {
+                    if(flipx) dx = sw - dx;
+                    if(flipy) dy = sh - dy;
+                    *pc = *((tColorRGBA *)((Uint8 *)src->pixels + src->pitch * dy) + dx);
+                }
+                sdx += icos;
+                sdy += isin;
+                pc++;
+            }
+            pc = (tColorRGBA *) ((Uint8 *) pc + gap);
+        }
+    }
+}
+
+/* !
+
+\brief Rotates and zooms 8 bit palette/Y 'src' surface to 'dst' surface without smoothing.
+
+Rotates and zooms 8 bit RGBA/ABGR 'src' surface to 'dst' surface based on the control
+parameters by scanning the destination surface.
+Assumes src and dst surfaces are of 8 bit depth.
+Assumes dst surface was allocated with the correct dimensions.
+
+\param src Source surface.
+\param dst Destination surface.
+\param cx Horizontal center coordinate.
+\param cy Vertical center coordinate.
+\param isin Integer version of sine of angle.
+\param icos Integer version of cosine of angle.
+\param flipx Flag indicating horizontal mirroring should be applied.
+\param flipy Flag indicating vertical mirroring should be applied.
+*/
+static void
+transformSurfaceY(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos, int flipx, int flipy)
+{
+    int x, y, dx, dy, xd, yd, sdx, sdy, ax, ay;
+    tColorY *pc;
+    int gap;
+
+    /*
+    * Variable setup
+    */
+    xd = ((src->w - dst->w) << 15);
+    yd = ((src->h - dst->h) << 15);
+    ax = (cx << 16) - (icos * cx);
+    ay = (cy << 16) - (isin * cx);
+    pc = (tColorY*) dst->pixels;
+    gap = dst->pitch - dst->w;
+    /*
+    * Clear surface to colorkey
+    */
+    SDL_memset(pc, (int)(_colorkey(src) & 0xff), dst->pitch * dst->h);
+    /*
+    * Iterate through destination surface
+    */
+    for (y = 0; y < dst->h; y++) {
+        dy = cy - y;
+        sdx = (ax + (isin * dy)) + xd;
+        sdy = (ay - (icos * dy)) + yd;
+        for (x = 0; x < dst->w; x++) {
+            dx = (sdx >> 16);
+            dy = (sdy >> 16);
+            if ((unsigned)dx < (unsigned)src->w && (unsigned)dy < (unsigned)src->h) {
+                if (flipx) dx = (src->w-1)-dx;
+                if (flipy) dy = (src->h-1)-dy;
+                *pc = *((tColorY *)src->pixels + src->pitch * dy + dx);
+            }
+            sdx += icos;
+            sdy += isin;
+            pc++;
+        }
+        pc += gap;
+    }
+}
+
+
+/* !
+\brief Rotates and zooms a surface with different horizontal and vertival scaling factors and optional anti-aliasing.
+
+Rotates a 32-bit or 8-bit 'src' surface to newly created 'dst' surface.
+'angle' is the rotation in degrees, 'centerx' and 'centery' the rotation center. If 'smooth' is set
+then the destination 32-bit surface is anti-aliased. 8-bit surfaces must have a colorkey. 32-bit
+surfaces must have a 8888 layout with red, green, blue and alpha masks (any ordering goes).
+The blend mode of the 'src' surface has some effects on generation of the 'dst' surface: The NONE
+mode will set the BLEND mode on the 'dst' surface. The MOD mode either generates a white 'dst'
+surface and sets the colorkey or fills the it with the colorkey before copying the pixels.
+When using the NONE and MOD modes, color and alpha modulation must be applied before using this function.
+
+\param src The surface to rotozoom.
+\param angle The angle to rotate in degrees.
+\param centerx The horizontal coordinate of the center of rotation
+\param zoomy The vertical coordinate of the center of rotation
+\param smooth Antialiasing flag; set to SMOOTHING_ON to enable.
+\param flipx Set to 1 to flip the image horizontally
+\param flipy Set to 1 to flip the image vertically
+\param dstwidth The destination surface width
+\param dstheight The destination surface height
+\param cangle The angle cosine
+\param sangle The angle sine
+\return The new rotated surface.
+
+*/
+
+SDL_Surface *
+SDLgfx_rotateSurface(SDL_Surface * src, double angle, int centerx, int centery, int smooth, int flipx, int flipy, int dstwidth, int dstheight, double cangle, double sangle)
+{
+    SDL_Surface *rz_dst;
+    int is8bit, angle90;
+    int i;
+    SDL_BlendMode blendmode;
+    Uint32 colorkey = 0;
+    int colorKeyAvailable = SDL_FALSE;
+    double sangleinv, cangleinv;
+
+    /* Sanity check */
+    if (src == NULL)
+        return NULL;
+
+    if (SDL_HasColorKey(src)) {
+        if (SDL_GetColorKey(src, &colorkey) == 0) {
+            colorKeyAvailable = SDL_TRUE;
+        }
+    }
+
+    /* This function requires a 32-bit surface or 8-bit surface with a colorkey */
+    is8bit = src->format->BitsPerPixel == 8 && colorKeyAvailable;
+    if (!(is8bit || (src->format->BitsPerPixel == 32 && src->format->Amask)))
+        return NULL;
+
+    /* Calculate target factors from sin/cos and zoom */
+    sangleinv = sangle*65536.0;
+    cangleinv = cangle*65536.0;
+
+    /* Alloc space to completely contain the rotated surface */
+    rz_dst = NULL;
+    if (is8bit) {
+        /* Target surface is 8 bit */
+        rz_dst = SDL_CreateRGBSurface(0, dstwidth, dstheight + GUARD_ROWS, 8, 0, 0, 0, 0);
+        if (rz_dst != NULL) {
+            for (i = 0; i < src->format->palette->ncolors; i++) {
+                rz_dst->format->palette->colors[i] = src->format->palette->colors[i];
+            }
+            rz_dst->format->palette->ncolors = src->format->palette->ncolors;
+        }
+    } else {
+        /* Target surface is 32 bit with source RGBA ordering */
+        rz_dst = SDL_CreateRGBSurface(0, dstwidth, dstheight + GUARD_ROWS, 32,
+                                      src->format->Rmask, src->format->Gmask,
+                                      src->format->Bmask, src->format->Amask);
+    }
+
+    /* Check target */
+    if (rz_dst == NULL)
+        return NULL;
+
+    /* Adjust for guard rows */
+    rz_dst->h = dstheight;
+
+    SDL_GetSurfaceBlendMode(src, &blendmode);
+
+    if (colorKeyAvailable == SDL_TRUE) {
+        /* If available, the colorkey will be used to discard the pixels that are outside of the rotated area. */
+        SDL_SetColorKey(rz_dst, SDL_TRUE, colorkey);
+        SDL_FillRect(rz_dst, NULL, colorkey);
+    } else if (blendmode == SDL_BLENDMODE_NONE) {
+        blendmode = SDL_BLENDMODE_BLEND;
+    } else if (blendmode == SDL_BLENDMODE_MOD || blendmode == SDL_BLENDMODE_MUL) {
+        /* Without a colorkey, the target texture has to be white for the MOD and MUL blend mode so
+         * that the pixels outside the rotated area don't affect the destination surface.
+         */
+        colorkey = SDL_MapRGBA(rz_dst->format, 255, 255, 255, 0);
+        SDL_FillRect(rz_dst, NULL, colorkey);
+        /* Setting a white colorkey for the destination surface makes the final blit discard
+         * all pixels outside of the rotated area. This doesn't interfere with anything because
+         * white pixels are already a no-op and the MOD blend mode does not interact with alpha.
+         */
+        SDL_SetColorKey(rz_dst, SDL_TRUE, colorkey);
+    }
+
+    SDL_SetSurfaceBlendMode(rz_dst, blendmode);
+
+    /* Lock source surface */
+    if (SDL_MUSTLOCK(src)) {
+        SDL_LockSurface(src);
+    }
+
+    /* check if the rotation is a multiple of 90 degrees so we can take a fast path and also somewhat reduce
+     * the off-by-one problem in _transformSurfaceRGBA that expresses itself when the rotation is near
+     * multiples of 90 degrees.
+     */
+    angle90 = (int)(angle/90);
+    if (angle90 == angle/90) {
+        angle90 %= 4;
+        if (angle90 < 0) angle90 += 4; /* 0:0 deg, 1:90 deg, 2:180 deg, 3:270 deg */
+    } else {
+        angle90 = -1;
+    }
+
+    if (is8bit) {
+        /* Call the 8-bit transformation routine to do the rotation */
+        if(angle90 >= 0) {
+            transformSurfaceY90(src, rz_dst, angle90, flipx, flipy);
+        } else {
+            transformSurfaceY(src, rz_dst, centerx, centery, (int)sangleinv, (int)cangleinv,
+                              flipx, flipy);
+        }
+    } else {
+        /* Call the 32-bit transformation routine to do the rotation */
+        if (angle90 >= 0) {
+            transformSurfaceRGBA90(src, rz_dst, angle90, flipx, flipy);
+        } else {
+            _transformSurfaceRGBA(src, rz_dst, centerx, centery, (int)sangleinv, (int)cangleinv,
+                                  flipx, flipy, smooth);
+        }
+    }
+
+    /* Unlock source surface */
+    if (SDL_MUSTLOCK(src)) {
+        SDL_UnlockSurface(src);
+    }
+
+    /* Return rotated surface */
+    return rz_dst;
+}
+
+#endif /* SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED */

externals/SDL/src/render/software/SDL_rotate.h

@@ -0,0 +1,32 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_rotate_h_
+#define SDL_rotate_h_
+
+#ifndef MIN
+#define MIN(a,b)    (((a) < (b)) ? (a) : (b))
+#endif
+
+extern SDL_Surface *SDLgfx_rotateSurface(SDL_Surface * src, double angle, int centerx, int centery, int smooth, int flipx, int flipy, int dstwidth, int dstheight, double cangle, double sangle);
+extern void SDLgfx_rotozoomSurfaceSizeTrig(int width, int height, double angle, int *dstwidth, int *dstheight, double *cangle, double *sangle);
+
+#endif /* SDL_rotate_h_ */