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engine/iengine.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+// $NoKeywords: $
+//===========================================================================//
+#if !defined( IENGINE_H )
+#define IENGINE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "interface.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+abstract_class IEngine
+{
+public:
+	enum
+	{
+		QUIT_NOTQUITTING = 0,
+		QUIT_TODESKTOP,
+		QUIT_RESTART
+	};
+
+	// Engine State Flags
+	enum EngineState_t
+	{
+		DLL_INACTIVE = 0,		// no dll
+		DLL_ACTIVE,				// engine is focused
+		DLL_CLOSE,				// closing down dll
+		DLL_RESTART,			// engine is shutting down but will restart right away
+		DLL_PAUSED,				// engine is paused, can become active from this state
+	};
+
+
+	virtual			~IEngine( void ) { }
+
+	virtual	bool	Load( bool dedicated, const char *rootdir ) = 0;
+	virtual void	Unload( void ) = 0;
+	virtual void	SetNextState( EngineState_t iNextState ) = 0;
+	virtual EngineState_t GetState( void ) = 0;
+
+	virtual void	Frame( void ) = 0;
+
+	virtual float	GetFrameTime( void ) = 0;
+	virtual float	GetCurTime( void ) = 0;
+
+	virtual int		GetQuitting( void ) = 0;
+	virtual void	SetQuitting( int quittype ) = 0;
+};
+
+extern IEngine *eng;
+
+#endif // IENGINE_H