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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@whitecape.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
This commit is contained in:
Kenneth Graunke 2016-07-21 17:42:01 -07:00
parent f80bea2d80
commit 0ba7288376
1 changed files with 4 additions and 0 deletions
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4
src/compiler/nir/nir_lower_io.c
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@ -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: