Initialize depth pointer correctly.

diff --git a/src/mesa/drivers/dri/unichrome/via_span.c b/src/mesa/drivers/dri/unichrome/via_span.c
index 07d20ad..253e80c 100644 (file)
--- a/src/mesa/drivers/dri/unichrome/via_span.c
+++ b/src/mesa/drivers/dri/unichrome/via_span.c
@@ -148,7 +148,7 @@
     __DRIdrawablePrivate *dPriv = vmesa->driDrawable;   \
     GLuint depth_pitch = vmesa->depth.pitch;                  \
     GLuint height = dPriv->h;                           \
-    char *buf = (char *)(vmesa->depth.map)   
+    char *buf = (char *)(vmesa->depth.map + (vmesa->drawXoff * vmesa->depth.bpp/8))
 
 #define LOCAL_STENCIL_VARS LOCAL_DEPTH_VARS