One of the biggest things keeping -mem/-heapsize numbers up is the video

memory in software mode. This is now taken care of, the memory is now
grabbed using calloc.

On Unix systems and all systems using SDL, the default video memory is now
8MB. This should now be enough for almost everybody, unless you have some
truly huge maps and boatloads of sounds. The minimum memory allowable is
now down to 4MB, but complex maps and/or models can cause the game to quit
-- not like this wasn't a problem already with the old 5.3MB lower limit,
but there it is.

include/bothdefs.h

@@ -40,7 +40,8 @@
 
 #define UNUSED(x)	(x = x)	// for pesky compiler / lint warnings
 
-#define	MINIMUM_MEMORY	0x550000
+							// Error out if we get less than 4MB
+#define	MINIMUM_MEMORY	0x400000
 
 
 

include/render.h

@@ -160,6 +160,7 @@ void R_DrawWaterSurfaces (void);
 extern	int		reinit_surfcache;	// if 1, surface cache is currently empty and
 extern qboolean	r_cache_thrash;	// set if thrashing the surface cache
 
+void *D_SurfaceCacheAddress (void);
 int	D_SurfaceCacheForRes (int width, int height);
 void D_FlushCaches (void);
 void D_DeleteSurfaceCache (void);