glsl: prohibit lowp, mediump precision on atomic_uint

Fixes following dEQP tests:

   dEQP-GLES31.functional.debug.negative_coverage.callbacks.atomic_counter.atomic_precision
   dEQP-GLES31.functional.debug.negative_coverage.get_error.atomic_counter.atomic_precision
   dEQP-GLES31.functional.debug.negative_coverage.log.atomic_counter.atomic_precision

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98131
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/compiler/glsl/ast_to_hir.cpp b/src/compiler/glsl/ast_to_hir.cpp
index 8cdb917..c3c8cef 100644
--- a/src/compiler/glsl/ast_to_hir.cpp
+++ b/src/compiler/glsl/ast_to_hir.cpp
@@ -2585,6 +2585,20 @@ select_gles_precision(unsigned qual_precision,
                           type->name);
       }
    }
+
+
+   /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
+    *
+    *    "The default precision of all atomic types is highp. It is an error to
+    *    declare an atomic type with a different precision or to specify the
+    *    default precision for an atomic type to be lowp or mediump."
+    */
+   if (type->base_type == GLSL_TYPE_ATOMIC_UINT &&
+       precision != ast_precision_high) {
+      _mesa_glsl_error(loc, state,
+                       "atomic_uint can only have highp precision qualifier");
+   }
+
    return precision;
 }