glsl: Add method ast_type_qualifier::interpolation_string()

If an interpolation qualifier is present, then the method returns that
qualifier's string representation. For example, if the noperspective bit
is set, then it returns "noperspective".

1 files changed, 13 insertions, 0 deletions

diff --git a/src/glsl/ast_type.cpp b/src/glsl/ast_type.cpp
index b7488cf6e90..a8761611d36 100644
--- a/src/glsl/ast_type.cpp
+++ b/src/glsl/ast_type.cpp
@@ -116,3 +116,16 @@ ast_fully_specified_type::has_qualifiers() const
 {
    return this->qualifier.flags.i != 0;
 }
+
+const char*
+ast_type_qualifier::interpolation_string() const
+{
+   if (this->flags.q.smooth)
+      return "smooth";
+   else if (this->flags.q.flat)
+      return "flat";
+   else if (this->flags.q.noperspective)
+      return "noperspective";
+   else
+      return NULL;
+}