Common: Add helper classes for D3D11

src/common/d3d11/stream_buffer.h

@@ -0,0 +1,43 @@
+#pragma once
+#include "../types.h"
+#include "YBaseLib/Windows/WindowsHeaders.h"
+#include <d3d11.h>
+#include <wrl/client.h>
+
+namespace D3D11 {
+class StreamBuffer
+{
+public:
+  template<typename T>
+  using ComPtr = Microsoft::WRL::ComPtr<T>;
+
+  StreamBuffer();
+  StreamBuffer(ComPtr<ID3D11Buffer> buffer);
+  ~StreamBuffer();
+
+  ALWAYS_INLINE ID3D11Buffer* GetD3DBuffer() const { return m_buffer.Get(); }
+  ALWAYS_INLINE ID3D11Buffer* const* GetD3DBufferArray() const { return m_buffer.GetAddressOf(); }
+  ALWAYS_INLINE u32 GetSize() const { return m_size; }
+  ALWAYS_INLINE u32 GetPosition() const { return m_position; }
+
+  bool Create(ID3D11Device* device, D3D11_BIND_FLAG bind_flags, u32 size);
+  void Adopt(ComPtr<ID3D11Buffer> buffer);
+  void Release();
+  
+  struct MappingResult
+  {
+    void* pointer;
+    u32 buffer_offset;
+    u32 index_aligned; // offset / alignment, suitable for base vertex
+    u32 space_aligned; // remaining space / alignment
+  };
+
+  MappingResult Map(ID3D11DeviceContext* context, u32 alignment, u32 min_size);
+  void Unmap(ID3D11DeviceContext* context, u32 used_size);
+
+private:
+  ComPtr<ID3D11Buffer> m_buffer;
+  u32 m_size;
+  u32 m_position;
+};
+} // namespace GL