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Cell: fix small sampling error in sample_texture_bilinear()
author
Brian
<brian.paul@tungstengraphics.com>
Mon, 4 Feb 2008 23:48:00 +0000
(16:48 -0700)
committer
Brian
<brian.paul@tungstengraphics.com>
Mon, 4 Feb 2008 23:48:00 +0000
(16:48 -0700)
src/mesa/pipe/cell/spu/spu_texture.c
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diff --git
a/src/mesa/pipe/cell/spu/spu_texture.c
b/src/mesa/pipe/cell/spu/spu_texture.c
index
9ee2b45
..
01ff33a
100644
(file)
--- a/
src/mesa/pipe/cell/spu/spu_texture.c
+++ b/
src/mesa/pipe/cell/spu/spu_texture.c
@@
-150,6
+150,8
@@
sample_texture_bilinear(vector float texcoord)
static const vector unsigned int offset01 = {0, 1, 0, 0};
vector float tc = spu_mul(texcoord, spu.tex_size);
+ tc = spu_add(tc, spu_splats(-0.5f)); /* half texel bias */
+
/* integer texcoords S,T: */
vector unsigned int itc00 = spu_convtu(tc, 0); /* convert to int */
vector unsigned int itc01 = spu_add(itc00, offset01);