96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
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// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <string>
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#include <vector>
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#include <glad/glad.h>
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#include "common/assert.h"
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#include "common/logging/log.h"
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namespace OpenGL::GLShader {
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/**
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* Utility function to log the source code of a list of shaders.
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* @param shaders The OpenGL shaders whose source we will print.
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*/
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template <typename... T>
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void LogShaderSource(T... shaders) {
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auto shader_list = {shaders...};
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for (const auto& shader : shader_list) {
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if (shader == 0)
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continue;
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GLint source_length;
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glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
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std::string source(source_length, ' ');
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glGetShaderSource(shader, source_length, nullptr, &source[0]);
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LOG_INFO(Render_OpenGL, "Shader source {}", source);
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}
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}
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/**
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* Utility function to create and compile an OpenGL GLSL shader
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* @param source String of the GLSL shader program
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* @param type Type of the shader (GL_VERTEX_SHADER, GL_GEOMETRY_SHADER or GL_FRAGMENT_SHADER)
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*/
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GLuint LoadShader(std::string_view source, GLenum type);
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/**
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* Utility function to create and compile an OpenGL GLSL shader program (vertex + fragment shader)
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* @param separable_program whether to create a separable program
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* @param shaders ID of shaders to attach to the program
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* @returns Handle of the newly created OpenGL program object
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*/
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template <typename... T>
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GLuint LoadProgram(bool separable_program, bool hint_retrievable, T... shaders) {
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// Link the program
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LOG_DEBUG(Render_OpenGL, "Linking program...");
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GLuint program_id = glCreateProgram();
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((shaders == 0 ? (void)0 : glAttachShader(program_id, shaders)), ...);
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if (separable_program) {
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glProgramParameteri(program_id, GL_PROGRAM_SEPARABLE, GL_TRUE);
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}
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if (hint_retrievable) {
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glProgramParameteri(program_id, GL_PROGRAM_BINARY_RETRIEVABLE_HINT, GL_TRUE);
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}
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glLinkProgram(program_id);
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// Check the program
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GLint result = GL_FALSE;
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GLint info_log_length;
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glGetProgramiv(program_id, GL_LINK_STATUS, &result);
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glGetProgramiv(program_id, GL_INFO_LOG_LENGTH, &info_log_length);
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if (info_log_length > 1) {
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std::string program_error(info_log_length, ' ');
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glGetProgramInfoLog(program_id, info_log_length, nullptr, &program_error[0]);
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if (result == GL_TRUE) {
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LOG_DEBUG(Render_OpenGL, "{}", program_error);
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} else {
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LOG_ERROR(Render_OpenGL, "Error linking shader:\n{}", program_error);
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}
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}
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if (result == GL_FALSE) {
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// There was a problem linking the shader, print the source for debugging purposes.
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LogShaderSource(shaders...);
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}
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ASSERT_MSG(result == GL_TRUE, "Shader not linked");
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((shaders == 0 ? (void)0 : glDetachShader(program_id, shaders)), ...);
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return program_id;
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}
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} // namespace OpenGL::GLShader
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