diff --git a/include/QF/vid.h b/include/QF/vid.h
index 0a7ef60b1..99c6dd8ef 100644
--- a/include/QF/vid.h
+++ b/include/QF/vid.h
@@ -45,6 +45,8 @@ typedef struct vrect_s {
 
 typedef struct {
 	pixel_t			*buffer;		// invisible buffer
+	short			*zbuffer;
+	void			*surfcache;
 	pixel_t			*colormap;		// 256 * VID_GRADES size
 	unsigned short	*colormap16;	// 256 * VID_GRADES size
 	int				fullbright;		// index of first fullbright color
@@ -62,6 +64,9 @@ typedef struct {
 	int				maxwarpheight;
 	pixel_t			*direct;		// direct drawing to framebuffer, if not
 									//  NULL
+	int				(*surf_cache_size)(int width, int height);
+	void			(*flush_caches)(void);
+	void			(*init_caches)(void *cache, int size);
 } viddef_t;
 
 extern viddef_t 		vid;				// global video state
diff --git a/libs/video/targets/vid_common_sw.c b/libs/video/targets/vid_common_sw.c
index 23f995eb9..44c885c1c 100644
--- a/libs/video/targets/vid_common_sw.c
+++ b/libs/video/targets/vid_common_sw.c
@@ -30,21 +30,22 @@
 # include "config.h"
 #endif
 
+#include <stdlib.h>
 #include <math.h>
 
+#include "QF/sys.h"
 #include "QF/vid.h"
 
 void
 VID_InitBuffers (void)
 {
-#if 0 //XXX not just yet
-	int         buffersize, zbuffersize, cachesize;
-	void       *vid_surfcache;
+	int         buffersize, zbuffersize, cachesize = 1;
 
 	// Calculate the sizes we want first
 	buffersize = vid.rowbytes * vid.height;
-	zbuffersize = vid.width * vid.height * sizeof (*d_pzbuffer);
-	cachesize = D_SurfaceCacheForRes (vid.width, vid.height);
+	zbuffersize = vid.width * vid.height * sizeof (*vid.zbuffer);
+	if (vid.surf_cache_size)
+		cachesize = vid.surf_cache_size (vid.width, vid.height);
 
 	// Free the old screen buffer
 	if (vid.buffer) {
@@ -52,16 +53,16 @@ VID_InitBuffers (void)
 		vid.conbuffer = vid.buffer = NULL;
 	}
 	// Free the old z-buffer
-	if (d_pzbuffer) {
-		free (d_pzbuffer);
-		d_pzbuffer = NULL;
+	if (vid.zbuffer) {
+		free (vid.zbuffer);
+		vid.zbuffer = NULL;
 	}
 	// Free the old surface cache
-	vid_surfcache = D_SurfaceCacheAddress ();
-	if (vid_surfcache) {
-		D_FlushCaches ();
-		free (vid_surfcache);
-		vid_surfcache = NULL;
+	if (vid.surfcache) {
+		if (vid.flush_caches)
+			vid.flush_caches ();
+		free (vid.surfcache);
+		vid.surfcache = NULL;
 	}
 	// Allocate the new screen buffer
 	vid.conbuffer = vid.buffer = calloc (buffersize, 1);
@@ -69,22 +70,22 @@ VID_InitBuffers (void)
 		Sys_Error ("Not enough memory for video mode\n");
 	}
 	// Allocate the new z-buffer
-	d_pzbuffer = calloc (zbuffersize, 1);
-	if (!d_pzbuffer) {
+	vid.zbuffer = calloc (zbuffersize, 1);
+	if (!vid.zbuffer) {
 		free (vid.buffer);
 		vid.conbuffer = vid.buffer = NULL;
 		Sys_Error ("Not enough memory for video mode\n");
 	}
 	// Allocate the new surface cache; free the z-buffer if we fail
-	vid_surfcache = calloc (cachesize, 1);
-	if (!vid_surfcache) {
+	vid.surfcache = calloc (cachesize, 1);
+	if (!vid.surfcache) {
 		free (vid.buffer);
-		free (d_pzbuffer);
+		free (vid.zbuffer);
 		vid.conbuffer = vid.buffer = NULL;
-		d_pzbuffer = NULL;
+		vid.zbuffer = NULL;
 		Sys_Error ("Not enough memory for video mode\n");
 	}
 
-	D_InitCaches (vid_surfcache, cachesize);
-#endif
+	if (vid.init_caches)
+		vid.init_caches (vid.surfcache, cachesize);
 }
diff --git a/qw/source/d_init.c b/qw/source/d_init.c
index 22b47b87e..113d921e3 100644
--- a/qw/source/d_init.c
+++ b/qw/source/d_init.c
@@ -31,6 +31,8 @@
 #endif
 
 #include "QF/compat.h"
+#include "QF/vid.h"
+
 #include "bothdefs.h"
 #include "d_local.h"
 
@@ -65,6 +67,12 @@ D_Init (void)
 	r_recursiveaffinetriangles = true;
 	r_pixbytes = 1;
 	r_aliasuvscale = 1.0;
+
+	vid.surf_cache_size = D_SurfaceCacheForRes;
+	vid.flush_caches = D_FlushCaches;
+	vid.init_caches = D_InitCaches;
+
+	VID_InitBuffers ();
 }
 
 void
diff --git a/qw/source/d_surf.c b/qw/source/d_surf.c
index f5a7d74a8..12e5e4319 100644
--- a/qw/source/d_surf.c
+++ b/qw/source/d_surf.c
@@ -112,6 +112,8 @@ D_InitCaches (void *buffer, int size)
 	sc_base->owner = NULL;
 	sc_base->size = sc_size;
 
+	d_pzbuffer = vid.zbuffer;
+
 	D_ClearCacheGuard ();
 }