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i965/gen7: Fix shadow sampling in the old brw_wm_emit backend.

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On Ivybridge, the shadow comparitor goes in the first slot, rather than
at the end.  It's not necessary to send u, v, and r.

Fixes tests texturing/texdepth and glean/fbo.

NOTE: This is a candidate for the 7.11 branch.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit 572f631895)
This commit is contained in:
Kenneth Graunke 2011-05-12 04:02:32 -07:00 • committed by Ian Romanick
parent 67aa20d9d5
commit 66b41af391
1 changed files with 11 additions and 4 deletions
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15
src/mesa/drivers/dri/i965/brw_wm_emit.c
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@ -1094,9 +1094,16 @@ void emit_tex(struct brw_wm_compile *c,
if (intel->gen < 5 && c->dispatch_width == 8)
nr_texcoords = 3;
/* For shadow comparisons, we have to supply u,v,r. */
if (shadow)
nr_texcoords = 3;
if (shadow) {
if (intel->gen < 7) {
/* For shadow comparisons, we have to supply u,v,r. */
nr_texcoords = 3;
} else {
/* On Ivybridge, the shadow comparitor comes first. Just load it. */
brw_MOV(p, brw_message_reg(cur_mrf), arg[2]);
cur_mrf += mrf_per_channel;
}
}
/* Emit the texcoords. */
for (i = 0; i < nr_texcoords; i++) {
@ -1113,7 +1120,7 @@ void emit_tex(struct brw_wm_compile *c,
}
/* Fill in the shadow comparison reference value. */
if (shadow) {
if (shadow && intel->gen < 7) {
if (intel->gen >= 5) {
/* Fill in the cube map array index value. */
brw_MOV(p, brw_message_reg(cur_mrf), brw_imm_f(0));