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diff --git a/public/ivraddll.h b/public/ivraddll.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef IVRADDLL_H
+#define IVRADDLL_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "interface.h"
+#include "bspfile.h"
+
+
+#define VRAD_INTERFACE_VERSION "vraddll_1"
+
+
+class CBSPInfo
+{
+public:
+	byte			*dlightdata;
+	int				lightdatasize;
+
+	dface_t			*dfaces;
+	unsigned char	*m_pFacesTouched;	// If non-null, then this has 1 byte for each face and
+										// tells which faces had their lightmaps updated.										
+	int				numfaces;
+	
+	dvertex_t		*dvertexes;
+	int				numvertexes;
+
+	dedge_t			*dedges;
+	int				numedges;
+
+	int				*dsurfedges;
+	int				numsurfedges;
+
+	texinfo_t		*texinfo;
+	int				numtexinfo;
+
+	dtexdata_t		*dtexdata;
+	int				numtexdata;
+
+	ddispinfo_t		*g_dispinfo;
+	int				g_numdispinfo;
+
+	char				*texDataStringData;
+	int					nTexDataStringData;
+
+	int					*texDataStringTable;
+	int					nTexDataStringTable;
+};
+
+
+// This is the DLL interface to VRAD.
+class IVRadDLL
+{
+public:
+	// All vrad.exe does is load the VRAD DLL and run this.
+	virtual int			main( int argc, char **argv ) = 0;
+	
+	
+	// Load the BSP file into memory.
+	virtual bool		Init( char const *pFilename ) = 0;
+
+	// You must call this if you call Init(), to free resources.
+	virtual void		Release() = 0;
+
+	// Get some data from the BSP file that's in memory.
+	virtual void		GetBSPInfo( CBSPInfo *pInfo ) = 0;
+
+	// Incrementally relight the BSP file in memory given the new entity 
+	// descriptions in pVMFFile. pVMFFile should only contain light entities.
+	//
+	// Returns true only if the lightmaps are updated. If the process is 
+	// interrupted or there is an error, false is returned.
+	virtual bool		DoIncrementalLight( char const *pVMFFile ) = 0;
+
+	// Calling DoIncrementalLight doesn't actually write anything to disk.
+	// Calling this will write the incremental light file out and will write the
+	// current in-memory light data into the BSP.
+	// NOTE: if DoIncrementalLight never finished, this will do nothing and return false.
+	virtual bool		Serialize() = 0;
+
+	// Returns a 0-1 value telling how close it is to completing the task.
+	// This can be called from a separate thread than DoIncrementLight.
+	virtual float		GetPercentComplete() = 0;
+
+	// This can be called from a separate thread than the DoIncrementalLight thread.
+	// It asynchronously tells DoIncrementalLight to stop as soon as possible and exit.
+	virtual void		Interrupt() = 0;
+};
+
+
+#endif // IVRADDLL_H