D3D: Add GeometryShaderCache.

Source/Core/VideoBackends/D3D/GeometryShaderCache.h

@@ -0,0 +1,46 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <d3d11.h>
+#include <map>
+
+#include "VideoCommon/GeometryShaderGen.h"
+
+namespace DX11
+{
+
+class GeometryShaderCache
+{
+public:
+	static void Init();
+	static void Clear();
+	static void Shutdown();
+	static bool SetShader(u32 components); // TODO: Should be renamed to LoadShader
+	static bool InsertByteCode(const GeometryShaderUid &uid, const void* bytecode, unsigned int bytecodelen);
+
+	static ID3D11GeometryShader* GetActiveShader() { return last_entry->shader; }
+
+private:
+	struct GSCacheEntry
+	{
+		ID3D11GeometryShader* shader;
+
+		std::string code;
+
+		GSCacheEntry() : shader(nullptr) {}
+		void Destroy() { SAFE_RELEASE(shader); }
+	};
+
+	typedef std::map<GeometryShaderUid, GSCacheEntry> GSCache;
+
+	static GSCache GeometryShaders;
+	static const GSCacheEntry* last_entry;
+	static GeometryShaderUid last_uid;
+
+	static UidChecker<GeometryShaderUid, ShaderCode> geometry_uid_checker;
+};
+
+}  // namespace DX11