glsl: Move is_builtin flag back to ir_function_signature.

This effectively reverts b6f15869b324ae64a00d0fe46fa3c8c62c1edb6c.

In desktop GLSL, defining a function with the same name as a built-in
hides that built-in function completely, so there would never be
built-in and user function signatures in the same ir_function.

However, in GLSL ES, overloading built-ins is allowed, and does not
hide the built-in signatures - so we're back to needing this.

1 files changed, 13 insertions, 1 deletions

diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index 6d727253740..9ac24858958 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1073,6 +1073,7 @@ ir_function_signature::ir_function_signature(const glsl_type *return_type)
    : return_type(return_type), is_defined(false), _function(NULL)
 {
    this->ir_type = ir_type_function_signature;
+   this->is_builtin = false;
 }
 
 
@@ -1124,7 +1125,18 @@ ir_function::ir_function(const char *name)
 {
    this->ir_type = ir_type_function;
    this->name = talloc_strdup(this, name);
-   this->is_builtin = false;
+}
+
+
+bool
+ir_function::has_builtin_signature()
+{
+   foreach_list(n, &this->signatures) {
+      ir_function_signature *const sig = (ir_function_signature *) n;
+      if (sig->is_builtin)
+	 return true;
+   }
+   return false;
 }