clipping bugs...

[dosdemo] / src / polytmpl.h

diff --git a/src/polytmpl.h b/src/polytmpl.h
index db5997a..12df420 100644 (file)
--- a/src/polytmpl.h
+++ b/src/polytmpl.h
@@ -93,8 +93,9 @@ void POLYFILL(struct pvertex *pv, int nverts)
                if(pv[i].y > pv[botidx].y) botidx = i;
        }
 
-       left = alloca(pfill_fb.height * sizeof *left);
-       right = alloca(pfill_fb.height * sizeof *right);
+       /* +1 to avoid crashing due to off-by-one rounding errors in the rasterization */
+       left = alloca((pfill_fb.height + 1) * sizeof *left);
+       right = alloca((pfill_fb.height + 1) * sizeof *right);
 
        for(i=0; i<nverts; i++) {
                int next = NEXTIDX(i);