VideoCommon: Add a separate constants buffer for the geometry shader.

Source/Core/VideoCommon/GeometryShaderManager.h

@@ -0,0 +1,29 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "VideoCommon/ConstantManager.h"
+#include "VideoCommon/GeometryShaderGen.h"
+
+class PointerWrap;
+
+// The non-API dependent parts.
+class GeometryShaderManager
+{
+public:
+	static void Init();
+	static void Dirty();
+	static void Shutdown();
+	static void DoState(PointerWrap &p);
+
+	// constant management
+	static void SetConstants();
+
+	static void SetViewportChanged();
+	static void SetProjectionChanged();
+
+	static GeometryShaderConstants constants;
+	static bool dirty;
+};