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// Copyright 2018 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <deque>
#include <vector>
#include "common/alignment.h"
#include "common/assert.h"
#include "video_core/renderer_opengl/gl_state.h"
#include "video_core/renderer_opengl/gl_stream_buffer.h"
namespace OpenGL {
OGLStreamBuffer::OGLStreamBuffer(GLenum target, GLsizeiptr size, bool prefer_coherent)
: gl_target(target), buffer_size(size) {
gl_buffer.Create();
glBindBuffer(gl_target, gl_buffer.handle);
GLsizeiptr allocate_size = size;
if (target == GL_ARRAY_BUFFER) {
// On AMD GPU there is a strange crash in indexed drawing. The crash happens when the buffer
// read position is near the end and is an out-of-bound access to the vertex buffer. This is
// probably a bug in the driver and is related to the usage of vec3<byte> attributes in the
// vertex array. Doubling the allocation size for the vertex buffer seems to avoid the
// crash.
allocate_size *= 2;
}
if (GLAD_GL_ARB_buffer_storage) {
persistent = true;
coherent = prefer_coherent;
const GLbitfield flags =
GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | (coherent ? GL_MAP_COHERENT_BIT : 0);
glBufferStorage(gl_target, allocate_size, nullptr, flags);
mapped_ptr = static_cast<u8*>(glMapBufferRange(
gl_target, 0, buffer_size, flags | (coherent ? 0 : GL_MAP_FLUSH_EXPLICIT_BIT)));
} else {
glBufferData(gl_target, allocate_size, nullptr, GL_STREAM_DRAW);
}
}
OGLStreamBuffer::~OGLStreamBuffer() {
if (persistent) {
glBindBuffer(gl_target, gl_buffer.handle);
glUnmapBuffer(gl_target);
}
gl_buffer.Release();
}
GLuint OGLStreamBuffer::GetHandle() const {
return gl_buffer.handle;
}
GLsizeiptr OGLStreamBuffer::GetSize() const {
return buffer_size;
}
std::tuple<u8*, GLintptr, bool> OGLStreamBuffer::Map(GLsizeiptr size, GLintptr alignment) {
ASSERT(size <= buffer_size);
ASSERT(alignment <= buffer_size);
mapped_size = size;
if (alignment > 0) {
buffer_pos = Common::AlignUp<size_t>(buffer_pos, alignment);
}
bool invalidate = false;
if (buffer_pos + size > buffer_size) {
buffer_pos = 0;
invalidate = true;
if (persistent) {
glUnmapBuffer(gl_target);
}
}
if (invalidate | !persistent) {
GLbitfield flags = GL_MAP_WRITE_BIT | (persistent ? GL_MAP_PERSISTENT_BIT : 0) |
(coherent ? GL_MAP_COHERENT_BIT : GL_MAP_FLUSH_EXPLICIT_BIT) |
(invalidate ? GL_MAP_INVALIDATE_BUFFER_BIT : GL_MAP_UNSYNCHRONIZED_BIT);
mapped_ptr = static_cast<u8*>(
glMapBufferRange(gl_target, buffer_pos, buffer_size - buffer_pos, flags));
mapped_offset = buffer_pos;
}
return std::make_tuple(mapped_ptr + buffer_pos - mapped_offset, buffer_pos, invalidate);
}
void OGLStreamBuffer::Unmap(GLsizeiptr size) {
ASSERT(size <= mapped_size);
if (!coherent && size > 0) {
glFlushMappedBufferRange(gl_target, buffer_pos - mapped_offset, size);
}
if (!persistent) {
glUnmapBuffer(gl_target);
}
buffer_pos += size;
}
} // namespace OpenGL
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