64 lines
2.2 KiB
C++
Executable File
64 lines
2.2 KiB
C++
Executable File
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <array>
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#include <memory>
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#include <span>
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#include <glad/glad.h>
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#include "common/alignment.h"
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#include "common/assert.h"
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#include "video_core/renderer_opengl/gl_stream_buffer.h"
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namespace OpenGL {
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StreamBuffer::StreamBuffer() {
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static constexpr GLenum flags = GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT;
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buffer.Create();
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glObjectLabel(GL_BUFFER, buffer.handle, -1, "Stream Buffer");
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glNamedBufferStorage(buffer.handle, STREAM_BUFFER_SIZE, nullptr, flags);
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mapped_pointer =
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static_cast<u8*>(glMapNamedBufferRange(buffer.handle, 0, STREAM_BUFFER_SIZE, flags));
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for (OGLSync& sync : fences) {
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sync.Create();
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}
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}
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std::pair<std::span<u8>, size_t> StreamBuffer::Request(size_t size) noexcept {
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ASSERT(size < REGION_SIZE);
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for (size_t region = Region(used_iterator), region_end = Region(iterator); region < region_end;
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++region) {
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fences[region].Create();
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}
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used_iterator = iterator;
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for (size_t region = Region(free_iterator) + 1,
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region_end = std::min(Region(iterator + size) + 1, NUM_SYNCS);
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region < region_end; ++region) {
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glClientWaitSync(fences[region].handle, 0, GL_TIMEOUT_IGNORED);
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fences[region].Release();
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}
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if (iterator + size >= free_iterator) {
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free_iterator = iterator + size;
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}
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if (iterator + size > STREAM_BUFFER_SIZE) {
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for (size_t region = Region(used_iterator); region < NUM_SYNCS; ++region) {
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fences[region].Create();
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}
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used_iterator = 0;
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iterator = 0;
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free_iterator = size;
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for (size_t region = 0, region_end = Region(size); region <= region_end; ++region) {
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glClientWaitSync(fences[region].handle, 0, GL_TIMEOUT_IGNORED);
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fences[region].Release();
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}
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}
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const size_t offset = iterator;
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iterator = Common::AlignUp(iterator + size, MAX_ALIGNMENT);
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return {std::span(mapped_pointer + offset, size), offset};
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}
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} // namespace OpenGL
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