2 files changed, 18 insertions, 0 deletions
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 5878c051b15..1faae3c7259 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -566,6 +566,13 @@ public:
 
    /**
     * Find a signature that matches a set of actual parameters, taking implicit
+    * conversions into account.  Also flags whether the match was exact.
+    */
+   ir_function_signature *matching_signature(const exec_list *actual_param,
+					     bool *match_is_exact);
+
+   /**
+    * Find a signature that matches a set of actual parameters, taking implicit
     * conversions into account.
     */
    ir_function_signature *matching_signature(const exec_list *actual_param);
diff --git a/src/glsl/ir_function.cpp b/src/glsl/ir_function.cpp
index 51d32b46f98..b34a5008168 100644
--- a/src/glsl/ir_function.cpp
+++ b/src/glsl/ir_function.cpp
@@ -118,6 +118,14 @@ parameter_lists_match(const exec_list *list_a, const exec_list *list_b)
 ir_function_signature *
 ir_function::matching_signature(const exec_list *actual_parameters)
 {
+   bool is_exact;
+   return matching_signature(actual_parameters, &is_exact);
+}
+
+ir_function_signature *
+ir_function::matching_signature(const exec_list *actual_parameters,
+			        bool *is_exact)
+{
    ir_function_signature *match = NULL;
    bool multiple_inexact_matches = false;
 
@@ -137,6 +145,7 @@ ir_function::matching_signature(const exec_list *actual_parameters)
 
       switch (parameter_lists_match(& sig->parameters, actual_parameters)) {
       case PARAMETER_LIST_EXACT_MATCH:
+	 *is_exact = true;
 	 return sig;
       case PARAMETER_LIST_INEXACT_MATCH:
 	 if (match == NULL)
@@ -159,6 +168,8 @@ ir_function::matching_signature(const exec_list *actual_parameters)
     * FINISHME: a "no matching signature" error; it should report that the
     * FINISHME: call is ambiguous.  But reporting errors from here is hard.
     */
+   *is_exact = false;
+
    if (multiple_inexact_matches)
       return NULL;