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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <array>
#include <optional>
#include <span>
#include <utility>
#include <vector>
#include <glad/glad.h>
#include "common/common_types.h"
#include "common/literals.h"
#include "video_core/renderer_opengl/gl_resource_manager.h"
namespace OpenGL {
using namespace Common::Literals;
struct StagingBufferMap {
~StagingBufferMap();
std::span<u8> mapped_span;
size_t offset = 0;
OGLSync* sync;
GLuint buffer;
};
struct StagingBuffers {
explicit StagingBuffers(GLenum storage_flags_, GLenum map_flags_);
~StagingBuffers();
StagingBufferMap RequestMap(size_t requested_size, bool insert_fence);
size_t RequestBuffer(size_t requested_size);
std::optional<size_t> FindBuffer(size_t requested_size);
std::vector<OGLSync> syncs;
std::vector<OGLBuffer> buffers;
std::vector<u8*> maps;
std::vector<size_t> sizes;
std::vector<size_t> sync_indices;
GLenum storage_flags;
GLenum map_flags;
size_t current_sync_index = 0;
};
class StreamBuffer {
static constexpr size_t STREAM_BUFFER_SIZE = 64_MiB;
static constexpr size_t NUM_SYNCS = 16;
static constexpr size_t REGION_SIZE = STREAM_BUFFER_SIZE / NUM_SYNCS;
static constexpr size_t MAX_ALIGNMENT = 256;
static_assert(STREAM_BUFFER_SIZE % MAX_ALIGNMENT == 0);
static_assert(STREAM_BUFFER_SIZE % NUM_SYNCS == 0);
static_assert(REGION_SIZE % MAX_ALIGNMENT == 0);
public:
explicit StreamBuffer();
[[nodiscard]] std::pair<std::span<u8>, size_t> Request(size_t size) noexcept;
[[nodiscard]] GLuint Handle() const noexcept {
return buffer.handle;
}
private:
[[nodiscard]] static size_t Region(size_t offset) noexcept {
return offset / REGION_SIZE;
}
size_t iterator = 0;
size_t used_iterator = 0;
size_t free_iterator = 0;
u8* mapped_pointer = nullptr;
OGLBuffer buffer;
std::array<OGLSync, NUM_SYNCS> fences;
};
class StagingBufferPool {
public:
StagingBufferPool() = default;
~StagingBufferPool() = default;
StagingBufferMap RequestUploadBuffer(size_t size);
StagingBufferMap RequestDownloadBuffer(size_t size);
private:
StagingBuffers upload_buffers{GL_MAP_WRITE_BIT, GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT};
StagingBuffers download_buffers{GL_MAP_READ_BIT | GL_CLIENT_STORAGE_BIT, GL_MAP_READ_BIT};
};
} // namespace OpenGL
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