Common: Add a range of Vulkan helper/wrapper classes

src/common/vulkan/stream_buffer.h

@@ -0,0 +1,66 @@
+// 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