glsl: Don't allow redefining builtin functions on GLSL 1.00.

The spec text cited above says you can't, but only the GLSL 3.00 (redefine
or overload) case was implemented.

Fixes dEQP scoping.invalid.redefine_builtin_fragment/vertex.

Reviewed-by: Samuel Pitoiset <[email protected]>
Tested-by: Matt Turner <[email protected]>

1 files changed, 13 insertions, 2 deletions

diff --git a/src/compiler/glsl/ast_to_hir.cpp b/src/compiler/glsl/ast_to_hir.cpp
index b03476c5763..0dc69ef4b11 100644
--- a/src/compiler/glsl/ast_to_hir.cpp
+++ b/src/compiler/glsl/ast_to_hir.cpp
@@ -5888,16 +5888,27 @@ ast_function::hir(exec_list *instructions,
     * "User code can overload the built-in functions but cannot redefine
     * them."
     */
-   if (state->es_shader && state->language_version >= 300) {
+   if (state->es_shader) {
       /* Local shader has no exact candidates; check the built-ins. */
       _mesa_glsl_initialize_builtin_functions();
-      if (_mesa_glsl_has_builtin_function(name)) {
+      if (state->language_version >= 300 &&
+          _mesa_glsl_has_builtin_function(name)) {
          YYLTYPE loc = this->get_location();
          _mesa_glsl_error(& loc, state,
                           "A shader cannot redefine or overload built-in "
                           "function `%s' in GLSL ES 3.00", name);
          return NULL;
       }
+
+      if (state->language_version == 100) {
+         ir_function_signature *sig =
+            _mesa_glsl_find_builtin_function(state, name, &hir_parameters);
+         if (sig && sig->is_builtin()) {
+            _mesa_glsl_error(& loc, state,
+                             "A shader cannot redefine built-in "
+                             "function `%s' in GLSL ES 1.00", name);
+         }
+      }
    }
 
    /* Verify that this function's signature either doesn't match a previously