Added original SDK code for Alien Swarm.

game/client/perfvisualbenchmark.h

@@ -0,0 +1,65 @@
+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+
+#if !defined PERFVISUALBENCHMARK_H
+#define PERFVISUALBENCHMARK_H
+
+#define FPS_STABILIZE_TIME 1.5
+#define FPS_STABILIZE_TIME_RELOAD_MATERIALS 10.0
+#define FPS_MEASURE_TIME 2.0
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include <igameevents.h>
+#include <igamesystem.h>
+
+class CPerfVisualBenchmark : public CBaseGameSystemPerFrame
+{
+	
+public:
+	CPerfVisualBenchmark();
+	virtual ~CPerfVisualBenchmark();
+
+public: // CBaseGameSystem overrides
+
+	virtual char const *Name() { return "CPerfVisualBenchmark"; }
+
+	virtual bool Init();
+	virtual void PreRender( );
+
+	void Start();
+	void Stop();
+
+private:
+	void Print();
+	struct RunInfo_t
+	{
+		const char *m_pVarName;
+		const char *m_pOnVal;
+		const char *m_pOffVal;
+		const char *m_pDescription;
+		float m_flStabilizeTime;
+		float m_flFPS;
+	};
+
+private:
+	CUtlVector<RunInfo_t> m_RunInfo;
+	bool m_bIsOn;				//is this thing on?
+	int m_iCurVar;				//what convar are we at?
+	float m_flTimer;			//time since we started measuring the current convar
+	float m_flStartMeasureTime;
+	int m_nStartFrameCount;
+	bool m_bSaveMouseEnable;	// remember this so that we can reset it after the benchmark
+	bool m_bWaiting;
+};
+
+extern IGameSystem* PerfVisualBenchmark();
+
+#endif // PERFVISUALBENCHMARK_H