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glsl: make sure that interpolateAt arguments are variables

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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>
This commit is contained in:
Ilia Mirkin
2016-05-12 23:54:36 -04:00
parent 8f45f4f3ca
commit 5239f1e0c9
1 changed files with 1 additions and 1 deletions
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2
src/compiler/glsl/ast_function.cpp
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@@ -209,7 +209,7 @@ verify_parameter_modes(_mesa_glsl_parse_state *state,
/* Verify that shader_in parameters are shader inputs */
if (formal->data.must_be_shader_input) {
ir_variable *var = actual->variable_referenced();
if (var && var->data.mode != ir_var_shader_in) {
if (!var || var->data.mode != ir_var_shader_in) {
_mesa_glsl_error(&loc, state,
"parameter `%s` must be a shader input",
formal->name);