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.
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 4d84ab3..78f3a74 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -740,14 +740,14 @@
ir_function_signature *sig =
(ir_function_signature *) iter.get();
- if (!sig->is_defined || f->is_builtin)
+ if (!sig->is_defined || sig->is_builtin)
continue;
ir_function_signature *other_sig =
other->exact_matching_signature(& sig->parameters);
if ((other_sig != NULL) && other_sig->is_defined
- && !other_sig->function()->is_builtin) {
+ && !other_sig->is_builtin) {
linker_error_printf(prog,
"function `%s' is multiply defined",
f->name);