90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
// Copyright 2018 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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#include <deque>
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#include <vector>
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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_state.h"
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#include "video_core/renderer_opengl/gl_stream_buffer.h"
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OGLStreamBuffer::OGLStreamBuffer(GLenum target, GLsizeiptr size, bool prefer_coherent)
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: gl_target(target), buffer_size(size) {
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gl_buffer.Create();
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glBindBuffer(gl_target, gl_buffer.handle);
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if (GLAD_GL_ARB_buffer_storage) {
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persistent = true;
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coherent = prefer_coherent;
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GLbitfield flags =
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GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | (coherent ? GL_MAP_COHERENT_BIT : 0);
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glBufferStorage(gl_target, buffer_size, nullptr, flags);
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mapped_ptr = static_cast<u8*>(glMapBufferRange(
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gl_target, 0, buffer_size, flags | (coherent ? 0 : GL_MAP_FLUSH_EXPLICIT_BIT)));
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} else {
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glBufferData(gl_target, buffer_size, nullptr, GL_STREAM_DRAW);
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}
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}
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OGLStreamBuffer::~OGLStreamBuffer() {
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if (persistent) {
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glBindBuffer(gl_target, gl_buffer.handle);
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glUnmapBuffer(gl_target);
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}
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gl_buffer.Release();
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}
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GLuint OGLStreamBuffer::GetHandle() const {
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return gl_buffer.handle;
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}
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GLsizeiptr OGLStreamBuffer::GetSize() const {
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return buffer_size;
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}
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std::tuple<u8*, GLintptr, bool> OGLStreamBuffer::Map(GLsizeiptr size, GLintptr alignment) {
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ASSERT(size <= buffer_size);
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ASSERT(alignment <= buffer_size);
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mapped_size = size;
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if (alignment > 0) {
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buffer_pos = Common::AlignUp<size_t>(buffer_pos, alignment);
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}
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bool invalidate = false;
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if (buffer_pos + size > buffer_size) {
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buffer_pos = 0;
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invalidate = true;
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if (persistent) {
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glUnmapBuffer(gl_target);
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}
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}
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if (invalidate | !persistent) {
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GLbitfield flags = GL_MAP_WRITE_BIT | (persistent ? GL_MAP_PERSISTENT_BIT : 0) |
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(coherent ? GL_MAP_COHERENT_BIT : GL_MAP_FLUSH_EXPLICIT_BIT) |
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(invalidate ? GL_MAP_INVALIDATE_BUFFER_BIT : GL_MAP_UNSYNCHRONIZED_BIT);
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mapped_ptr = static_cast<u8*>(
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glMapBufferRange(gl_target, buffer_pos, buffer_size - buffer_pos, flags));
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mapped_offset = buffer_pos;
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}
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return std::make_tuple(mapped_ptr + buffer_pos - mapped_offset, buffer_pos, invalidate);
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}
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void OGLStreamBuffer::Unmap(GLsizeiptr size) {
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ASSERT(size <= mapped_size);
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if (!coherent) {
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glFlushMappedBufferRange(gl_target, buffer_pos - mapped_offset, size);
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}
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if (!persistent) {
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glUnmapBuffer(gl_target);
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}
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buffer_pos += size;
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}
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