llvmpipe: simplify mask computation

Make this a little easier to understand.
2009-12-01 16:24:16 -07:00
parent 6bde3e0fdf
commit 9c48677491
1 changed files with 6 additions and 4 deletions
@@ -89,10 +89,12 @@ do_block_4( struct lp_rasterizer *rast,
   assert(x % 4 == 0);
   assert(y % 4 == 0);

-   for (i = 0; i < 16; i++)
-      mask |= (~(((c1 + tri->step[0][i]) | 
-		  (c2 + tri->step[1][i]) | 
-		  (c3 + tri->step[2][i])) >> 31)) & (1 << i);
+   for (i = 0; i < 16; i++) {
+      int any_negative = ((c1 + tri->step[0][i]) | 
+                          (c2 + tri->step[1][i]) | 
+                          (c3 + tri->step[2][i])) >> 31;
+      mask |= (~any_negative) & (1 << i);
+   }
   
   /* As we do trivial reject already, masks should rarely be all zero:
    */