Add D3DCommon (shared code between D3D11 and D3D12)

Source/Core/VideoBackends/D3DCommon/Shader.h

@@ -0,0 +1,33 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+#include <memory>
+#include "VideoBackends/D3DCommon/Common.h"
+#include "VideoCommon/AbstractShader.h"
+
+namespace D3DCommon
+{
+class Shader : public AbstractShader
+{
+public:
+  virtual ~Shader() override;
+
+  const BinaryData& GetByteCode() const { return m_bytecode; }
+
+  bool HasBinary() const override;
+  BinaryData GetBinary() const override;
+
+  static bool CompileShader(D3D_FEATURE_LEVEL feature_level, BinaryData* out_bytecode,
+                            ShaderStage stage, const char* source, size_t length);
+
+  static BinaryData CreateByteCode(const void* data, size_t length);
+
+protected:
+  Shader(ShaderStage stage, BinaryData bytecode);
+
+  BinaryData m_bytecode;
+};
+
+}  // namespace D3DCommon