spirv: handle gl_SampleMask

SPIR-V maps both gl_SampleMask and gl_SampleMaskIn to the same
builtin (SampleMask). The only way to tell which one we are dealing with
is to check if it is an input or an output.

Fixes:
dEQP-VK.pipeline.multisample_shader_builtin.sample_mask.write.*

Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Anuj Phogat <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index d55f81e5d34..4d1ec789cc3 100644
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -975,8 +975,12 @@ vtn_get_builtin_location(struct vtn_builder *b,
       set_mode_system_value(mode);
       break;
    case SpvBuiltInSampleMask:
-      *location = SYSTEM_VALUE_SAMPLE_MASK_IN; /* XXX out? */
-      set_mode_system_value(mode);
+      if (*mode == nir_var_shader_out) {
+         *location = FRAG_RESULT_SAMPLE_MASK;
+      } else {
+         *location = SYSTEM_VALUE_SAMPLE_MASK_IN;
+         set_mode_system_value(mode);
+      }
       break;
    case SpvBuiltInFragDepth:
       *location = FRAG_RESULT_DEPTH;