Add query to determine whether a type is a sampler

diff --git a/glsl_types.h b/glsl_types.h
index 57f339a..b1cd9a9 100644 (file)
--- a/glsl_types.h
+++ b/glsl_types.h
@@ -168,6 +168,14 @@ struct glsl_type {
    }
 
    /**
+    * Query whether or not a type is a sampler
+    */
+   bool is_sampler() const
+   {
+      return base_type == GLSL_TYPE_SAMPLER;
+   }
+
+   /**
     * Query whether or not a type is the void type singleton.
     */
    bool is_void() const