dolphin/Source/Core/VideoBackends/Vulkan/VKStreamBuffer.h

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// Copyright 2016 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#pragma once
#include <cstddef>
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#include <deque>
#include <memory>
#include <utility>
#include "Common/CommonTypes.h"
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#include "VideoBackends/Vulkan/Constants.h"
namespace Vulkan
{
class StreamBuffer
{
public:
StreamBuffer(VkBufferUsageFlags usage, u32 size);
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~StreamBuffer();
VkBuffer GetBuffer() const { return m_buffer; }
VkDeviceMemory GetDeviceMemory() const { return m_memory; }
u8* GetHostPointer() const { return m_host_pointer; }
u8* GetCurrentHostPointer() const { return m_host_pointer + m_current_offset; }
u32 GetCurrentSize() const { return m_size; }
u32 GetCurrentOffset() const { return m_current_offset; }
bool ReserveMemory(u32 num_bytes, u32 alignment);
void CommitMemory(u32 final_num_bytes);
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static std::unique_ptr<StreamBuffer> Create(VkBufferUsageFlags usage, u32 size);
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private:
bool AllocateBuffer();
void UpdateCurrentFencePosition();
void UpdateGPUPosition();
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// Waits for as many fences as needed to allocate num_bytes bytes from the buffer.
bool WaitForClearSpace(u32 num_bytes);
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VkBufferUsageFlags m_usage;
u32 m_size;
u32 m_current_offset = 0;
u32 m_current_gpu_position = 0;
u32 m_last_allocation_size = 0;
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VkBuffer m_buffer = VK_NULL_HANDLE;
VkDeviceMemory m_memory = VK_NULL_HANDLE;
u8* m_host_pointer = nullptr;
// List of fences and the corresponding positions in the buffer
std::deque<std::pair<u64, u32>> m_tracked_fences;
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bool m_coherent_mapping = false;
};
} // namespace Vulkan