KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

llvmpipe: Change triangle rasterization comparison from < 0 to <= 0 

Tested with custom rasterisation test tool added to piglit suite, reduced errors

Signed-off-by: José Fonseca <jfonseca@vmware.com>
This commit is contained in:
James Benton 2012-05-10 17:15:27 +01:00 committed by José Fonseca
parent 60e7b08101
commit 0c8a8a35e1
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/gallium/drivers/llvmpipe/lp_rast_tri.c
View File

@ -290,6 +290,10 @@ lp_rast_triangle_3_16(struct lp_rasterizer_task *task,
c = _mm_add_epi32(c, mm_mullo_epi32(dcdy, _mm_set1_epi32(y)));
rej4 = _mm_slli_epi32(rej4, 2);
/* Adjust so we can just check the sign bit (< 0 comparison), instead of having to do a less efficient <= 0 comparison */
c = _mm_sub_epi32(c, _mm_set1_epi32(1));
rej4 = _mm_add_epi32(rej4, _mm_set1_epi32(1));
dcdx2 = _mm_add_epi32(dcdx, dcdx);
dcdx3 = _mm_add_epi32(dcdx2, dcdx);
@ -383,7 +387,7 @@ lp_rast_triangle_3_4(struct lp_rasterizer_task *task,
__m128i span_1; /* 0,dcdx,2dcdx,3dcdx for plane 1 */
__m128i span_2; /* 0,dcdx,2dcdx,3dcdx for plane 2 */
__m128i unused;
transpose4_epi32(&p0, &p1, &p2, &zero,
&c, &dcdx, &dcdy, &unused);
@ -394,6 +398,9 @@ lp_rast_triangle_3_4(struct lp_rasterizer_task *task,
c = _mm_add_epi32(c, mm_mullo_epi32(dcdx, _mm_set1_epi32(x)));
c = _mm_add_epi32(c, mm_mullo_epi32(dcdy, _mm_set1_epi32(y)));
/* Adjust so we can just check the sign bit (< 0 comparison), instead of having to do a less efficient <= 0 comparison */
c = _mm_sub_epi32(c, _mm_set1_epi32(1));
dcdx2 = _mm_add_epi32(dcdx, dcdx);
dcdx3 = _mm_add_epi32(dcdx2, dcdx);