tree b9ebbee775d5320e6b9f50bd8b3a075c5e7319a5
parent 8f45f4f3cafa678292a87f316d2729da7800bab5
author Ilia Mirkin <imirkin@alum.mit.edu> 1463111676 -0400
committer Ilia Mirkin <imirkin@alum.mit.edu> 1463181446 -0400

glsl: make sure that interpolateAt arguments are variables

In the case of a constant, it might have been propagated through and
variable_referenced() returns NULL. Error out in that case.

Fixes 3 dEQP tests:

dEQP-GLES31.functional.shaders.multisample_interpolation.interpolate_at_sample.negative.interpolate_constant
dEQP-GLES31.functional.shaders.multisample_interpolation.interpolate_at_centroid.negative.interpolate_constant
dEQP-GLES31.functional.shaders.multisample_interpolation.interpolate_at_offset.negative.interpolate_constant

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Eduardo Lima Mitev <elima@igalia.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>