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llvmpipe: simplify mask computation
author
Brian Paul
<brianp@vmware.com>
Tue, 1 Dec 2009 23:24:16 +0000
(16:24 -0700)
committer
Brian Paul
<brianp@vmware.com>
Tue, 1 Dec 2009 23:24:19 +0000
(16:24 -0700)
Make this a little easier to understand.
src/gallium/drivers/llvmpipe/lp_rast_tri.c
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diff --git
a/src/gallium/drivers/llvmpipe/lp_rast_tri.c
b/src/gallium/drivers/llvmpipe/lp_rast_tri.c
index
9543b86
..
f6cb628
100644
(file)
--- a/
src/gallium/drivers/llvmpipe/lp_rast_tri.c
+++ b/
src/gallium/drivers/llvmpipe/lp_rast_tri.c
@@
-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:
*/