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authorBrian <brian.paul@tungstengraphics.com>2007-10-25 18:30:06 -0600
committerBrian <brian.paul@tungstengraphics.com>2007-10-25 20:32:45 -0600
commitafd19177e4e6571858fc94ab6be1b12bb54a04ed (patch)
treedea40dc94d759cdb197d2c8946f047e193414969 /src
parentaaac436c6c06232e383d5cee3c6dfc69eb820c83 (diff)
tex comments
Diffstat (limited to 'src')
-rw-r--r--src/mesa/pipe/tgsi/exec/tgsi_exec.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/src/mesa/pipe/tgsi/exec/tgsi_exec.c b/src/mesa/pipe/tgsi/exec/tgsi_exec.c
index d5a2639af1..3f464372ca 100644
--- a/src/mesa/pipe/tgsi/exec/tgsi_exec.c
+++ b/src/mesa/pipe/tgsi/exec/tgsi_exec.c
@@ -926,7 +926,7 @@ fetch_src_file_channel(
break;
case TGSI_FILE_OUTPUT:
- /* vertex varying/output vars can be read too */
+ /* vertex/fragment output vars can be read too */
chan->u[0] = mach->Outputs[index->i[0]].xyzw[swizzle].u[0];
chan->u[1] = mach->Outputs[index->i[1]].xyzw[swizzle].u[1];
chan->u[2] = mach->Outputs[index->i[2]].xyzw[swizzle].u[2];
@@ -1989,16 +1989,24 @@ exec_instruction(
break;
case TGSI_OPCODE_TEX:
- /* src arg0 is the texcoord */
+ /* simple texture lookup */
+ /* src[0] is the texcoord */
+ /* src[1] is the sampler unit */
exec_tex(mach, inst, FALSE);
break;
case TGSI_OPCODE_TXB:
- /* Texture lookup with lod bias (src0.w) */
+ /* Texture lookup with lod bias */
+ /* src[0] is the texcoord (src[0].w = load bias) */
+ /* src[1] is the sampler unit */
exec_tex(mach, inst, TRUE);
break;
case TGSI_OPCODE_TXD:
+ /* Texture lookup with explict partial derivatives */
+ /* src[0] = texcoord */
+ /* src[1] = d[strq]/dx */
+ /* src[2] = d[strq]/dy */
assert (0);
break;