glsl: add a parse check to check for the index layout qualifier

This can only be used if EXT_blend_func_extended is enabled

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index adf6a05..403cbd1 100644 (file)
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -1476,6 +1476,11 @@ layout_qualifier_id:
       }
 
       if (match_layout_qualifier("index", $1, state) == 0) {
+         if (state->es_shader && !state->EXT_blend_func_extended_enable) {
+            _mesa_glsl_error(& @3, state, "index layout qualifier requires EXT_blend_func_extended");
+            YYERROR;
+         }
+
          $$.flags.q.explicit_index = 1;
 
          if ($3 >= 0) {