glsl: Make it possible to ignore built-ins when matching signatures.

Historically, we've implemented the rules for overriding built-in
functions by creating multiple ir_functions and relying on the symbol
table to hide the one containing built-in functions.  That works, but
has a few drawbacks, so the next patch will change it.

Instead, we'll have a single ir_function for a particular name, which
will contain both built-in and user-defined signatures.  Passing an
extra parameter to matching_signature makes it easy to ignore built-ins
when they're supposed to be hidden.

I didn't add the parameter to exact_matching_signature since it wasn't
necessary.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index d588bc63ec4..0096fb023dc 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -1129,7 +1129,8 @@ get_main_function_signature(gl_shader *sh)
        * We don't have to check for multiple definitions of main (in multiple
        * shaders) because that would have already been caught above.
        */
-      ir_function_signature *sig = f->matching_signature(NULL, &void_parameters);
+      ir_function_signature *sig =
+         f->matching_signature(NULL, &void_parameters, false);
       if ((sig != NULL) && sig->is_defined) {
 	 return sig;
       }