D3D12: Initial commit for D3D12 backend implementation.

Source/Core/VideoBackends/D3D12/NativeVertexFormat.h

@@ -0,0 +1,31 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+#pragma once
+
+#include <array>
+#include <d3d12.h>
+
+#include "VideoCommon/NativeVertexFormat.h"
+
+namespace DX12
+{
+
+class D3DVertexFormat final : public NativeVertexFormat
+{
+	std::array<D3D12_INPUT_ELEMENT_DESC, 15> m_elems;
+	UINT m_num_elems;
+
+	D3D12_INPUT_LAYOUT_DESC m_layout12;
+
+public:
+	D3DVertexFormat(const PortableVertexDeclaration& vtx_decl);
+	~D3DVertexFormat();
+
+	void SetupVertexPointers();
+
+	D3D12_INPUT_LAYOUT_DESC GetActiveInputLayout12() const;
+
+private:
+	void AddInputElementDescFromAttributeFormatIfValid(const AttributeFormat* format, const char* semantic_name, unsigned int semantic_index);
+};
+}