Duckstation/src/common/vulkan/stream_buffer.h

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// Copyright 2016 Dolphin Emulator Project
// Copyright 2020 DuckStation Emulator Project
// Licensed under GPLv2+
// Refer to the LICENSE file included.
#pragma once
#include "../types.h"
#include "vulkan_loader.h"
#include <deque>
#include <memory>
namespace Vulkan {
class StreamBuffer
{
public:
StreamBuffer();
StreamBuffer(StreamBuffer&& move);
StreamBuffer(const StreamBuffer&) = delete;
~StreamBuffer();
StreamBuffer& operator=(StreamBuffer&& move);
StreamBuffer& operator=(const StreamBuffer&) = delete;
ALWAYS_INLINE bool IsValid() const { return (m_buffer != VK_NULL_HANDLE); }
ALWAYS_INLINE VkBuffer GetBuffer() const { return m_buffer; }
ALWAYS_INLINE const VkBuffer* GetBufferPointer() const { return &m_buffer; }
ALWAYS_INLINE VkDeviceMemory GetDeviceMemory() const { return m_memory; }
ALWAYS_INLINE void* GetHostPointer() const { return m_host_pointer; }
ALWAYS_INLINE void* GetCurrentHostPointer() const { return m_host_pointer + m_current_offset; }
ALWAYS_INLINE u32 GetCurrentSize() const { return m_size; }
ALWAYS_INLINE u32 GetCurrentSpace() const { return m_current_space; }
ALWAYS_INLINE u32 GetCurrentOffset() const { return m_current_offset; }
bool Create(VkBufferUsageFlags usage, u32 size);
void Destroy(bool defer);
bool ReserveMemory(u32 num_bytes, u32 alignment);
void CommitMemory(u32 final_num_bytes);
private:
bool AllocateBuffer(VkBufferUsageFlags usage, u32 size);
void UpdateCurrentFencePosition();
void UpdateGPUPosition();
// Waits for as many fences as needed to allocate num_bytes bytes from the buffer.
bool WaitForClearSpace(u32 num_bytes);
VkBufferUsageFlags m_usage = 0;
u32 m_size = 0;
u32 m_current_offset = 0;
u32 m_current_space = 0;
u32 m_current_gpu_position = 0;
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;
bool m_coherent_mapping = false;
};
} // namespace Vulkan