Mesa (master): nir: Lower interp_var_at_* like a normal load_var for flat inputs.
Kenneth Graunke
kwg at kemper.freedesktop.org
Sat Jul 23 03:33:25 UTC 2016
Module: Mesa
Branch: master
Commit: 0ba7288376dc66f932336862c8a6abb629b47686
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=0ba7288376dc66f932336862c8a6abb629b47686
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Thu Jul 21 17:42:01 2016 -0700
nir: Lower interp_var_at_* like a normal load_var for flat inputs.
"flat centroid" and "flat sample" both just mean "flat", so we should
ignore interpolateAtCentroid/Sample and just return the flat value.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97032
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
Reviewed-by: Anuj Phogat <anuj.phogat at gmail.com>
---
src/compiler/nir/nir_lower_io.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/compiler/nir/nir_lower_io.c b/src/compiler/nir/nir_lower_io.c
index bf8296f..b36836f 100644
--- a/src/compiler/nir/nir_lower_io.c
+++ b/src/compiler/nir/nir_lower_io.c
@@ -340,6 +340,10 @@ lower_interpolate_at(nir_intrinsic_instr *intrin, struct lower_io_state *state,
assert(var->data.mode == nir_var_shader_in);
+ /* Ignore interpolateAt() for flat variables - flat is flat. */
+ if (var->data.interpolation == INTERP_MODE_FLAT)
+ return lower_load(intrin, state, NULL, offset);
+
nir_intrinsic_op bary_op;
switch (intrin->intrinsic) {
case nir_intrinsic_interp_var_at_centroid:
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