GPU: Add D3D12 renderer

src/common/d3d12/stream_buffer.h

@@ -0,0 +1,58 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "../types.h"
+#include "../windows_headers.h"
+#include <d3d12.h>
+#include <deque>
+#include <utility>
+#include <wrl/client.h>
+
+namespace D3D12 {
+class StreamBuffer
+{
+public:
+  StreamBuffer();
+  ~StreamBuffer();
+
+  bool Create(u32 size);
+
+  ALWAYS_INLINE bool IsValid() const { return static_cast<bool>(m_buffer); }
+  ALWAYS_INLINE ID3D12Resource* GetBuffer() const { return m_buffer.Get(); }
+  ALWAYS_INLINE D3D12_GPU_VIRTUAL_ADDRESS GetGPUPointer() const { return m_gpu_pointer; }
+  ALWAYS_INLINE void* GetHostPointer() const { return m_host_pointer; }
+  ALWAYS_INLINE void* GetCurrentHostPointer() const { return m_host_pointer + m_current_offset; }
+  ALWAYS_INLINE D3D12_GPU_VIRTUAL_ADDRESS GetCurrentGPUPointer() const { return m_gpu_pointer + m_current_offset; }
+  ALWAYS_INLINE u32 GetSize() const { return m_size; }
+  ALWAYS_INLINE u32 GetCurrentOffset() const { return m_current_offset; }
+  ALWAYS_INLINE u32 GetCurrentSpace() const { return m_current_space; }
+
+  bool ReserveMemory(u32 num_bytes, u32 alignment);
+  void CommitMemory(u32 final_num_bytes);
+
+  void Destroy(bool defer = true);
+
+private:
+  void UpdateCurrentFencePosition();
+  void UpdateGPUPosition();
+
+  // Waits for as many fences as needed to allocate num_bytes bytes from the buffer.
+  bool WaitForClearSpace(u32 num_bytes);
+
+  u32 m_size = 0;
+  u32 m_current_offset = 0;
+  u32 m_current_space = 0;
+  u32 m_current_gpu_position = 0;
+
+  Microsoft::WRL::ComPtr<ID3D12Resource> m_buffer;
+  D3D12_GPU_VIRTUAL_ADDRESS m_gpu_pointer = {};
+  u8* m_host_pointer = nullptr;
+
+  // List of fences and the corresponding positions in the buffer
+  std::deque<std::pair<u64, u32>> m_tracked_fences;
+};
+
+} // namespace D3D12