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// Copyright 2018 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <tuple>
#include <vector>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/microprofile.h"
#include "video_core/renderer_opengl/gl_device.h"
#include "video_core/renderer_opengl/gl_stream_buffer.h"
MICROPROFILE_DEFINE(OpenGL_StreamBuffer, "OpenGL", "Stream Buffer Orphaning",
MP_RGB(128, 128, 192));
namespace OpenGL {
OGLStreamBuffer::OGLStreamBuffer(const Device& device, GLsizeiptr size, bool vertex_data_usage)
: buffer_size(size) {
gl_buffer.Create();
GLsizeiptr allocate_size = size;
if (vertex_data_usage) {
// 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;
}
static constexpr GLbitfield flags = GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT;
glNamedBufferStorage(gl_buffer.handle, allocate_size, nullptr, flags);
mapped_ptr = static_cast<u8*>(
glMapNamedBufferRange(gl_buffer.handle, 0, buffer_size, flags | GL_MAP_FLUSH_EXPLICIT_BIT));
if (device.UseAssemblyShaders() || device.HasVertexBufferUnifiedMemory()) {
glMakeNamedBufferResidentNV(gl_buffer.handle, GL_READ_ONLY);
glGetNamedBufferParameterui64vNV(gl_buffer.handle, GL_BUFFER_GPU_ADDRESS_NV, &gpu_address);
}
}
OGLStreamBuffer::~OGLStreamBuffer() {
glUnmapNamedBuffer(gl_buffer.handle);
gl_buffer.Release();
}
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<std::size_t>(buffer_pos, alignment);
}
bool invalidate = false;
if (buffer_pos + size > buffer_size) {
MICROPROFILE_SCOPE(OpenGL_StreamBuffer);
glInvalidateBufferData(gl_buffer.handle);
buffer_pos = 0;
invalidate = true;
}
return std::make_tuple(mapped_ptr + buffer_pos, buffer_pos, invalidate);
}
void OGLStreamBuffer::Unmap(GLsizeiptr size) {
ASSERT(size <= mapped_size);
if (size > 0) {
glFlushMappedNamedBufferRange(gl_buffer.handle, buffer_pos, size);
}
buffer_pos += size;
}
} // namespace OpenGL
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