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// Copyright 2018 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <tuple>
#include <glad/glad.h>
#include "common/common_types.h"
#include "video_core/renderer_opengl/gl_resource_manager.h"
namespace OpenGL {
class OGLStreamBuffer : private NonCopyable {
public:
explicit OGLStreamBuffer(GLenum target, GLsizeiptr size, bool prefer_coherent = false);
~OGLStreamBuffer();
GLuint GetHandle() const;
GLsizeiptr GetSize() const;
/*
* Allocates a linear chunk of memory in the GPU buffer with at least "size" bytes
* and the optional alignment requirement.
* If the buffer is full, the whole buffer is reallocated which invalidates old chunks.
* The return values are the pointer to the new chunk, the offset within the buffer,
* and the invalidation flag for previous chunks.
* The actual used size must be specified on unmapping the chunk.
*/
std::tuple<u8*, GLintptr, bool> Map(GLsizeiptr size, GLintptr alignment = 0);
void Unmap(GLsizeiptr size);
private:
OGLBuffer gl_buffer;
GLenum gl_target;
bool coherent = false;
bool persistent = false;
GLintptr buffer_pos = 0;
GLsizeiptr buffer_size = 0;
GLintptr mapped_offset = 0;
GLsizeiptr mapped_size = 0;
u8* mapped_ptr = nullptr;
};
} // namespace OpenGL
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