From 0ba7288376dc66f932336862c8a6abb629b47686 Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Thu, 21 Jul 2016 17:42:01 -0700 Subject: [PATCH] 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 Reviewed-by: Jason Ekstrand Reviewed-by: Anuj Phogat --- 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 bf8296f5b12..b36836f6f76 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: