glsl: Move type_contains_sampler() into glsl_type for later reuse.

The new location, as a member function of glsl_type, is more
consistent with queries like is_sampler(), is_boolean(), is_float(),
etc.  Placing the function inside glsl_type also makes it available to
any code that uses glsl_types.

src/glsl/glsl_types.cpp

@@ -111,6 +111,22 @@ add_types_to_symbol_table(glsl_symbol_table *symtab,
    }
 }
 
+bool
+glsl_type::contains_sampler() const
+{
+   if (this->is_array()) {
+      return this->fields.array->contains_sampler();
+   } else if (this->is_record()) {
+      for (unsigned int i = 0; i < this->length; i++) {
+	 if (this->fields.structure[i].type->contains_sampler())
+	    return true;
+      }
+      return false;
+   } else {
+      return this->is_sampler();
+   }
+}
+
 void
 glsl_type::generate_100ES_types(glsl_symbol_table *symtab)
 {

src/glsl/glsl_types.h

@@ -295,6 +295,12 @@ struct glsl_type {
       return base_type == GLSL_TYPE_SAMPLER;
    }
 
+   /**
+    * Query whether or not type is a sampler, or for struct and array
+    * types, contains a sampler.
+    */
+   bool contains_sampler() const;
+
    /**
     * Query whether or not a type is an array
     */

src/glsl/ir.cpp

@@ -1095,21 +1095,6 @@ ir_dereference_record::ir_dereference_record(ir_variable *var,
       ? this->record->type->field_type(field) : glsl_type::error_type;
 }
 
-bool type_contains_sampler(const glsl_type *type)
-{
-   if (type->is_array()) {
-      return type_contains_sampler(type->fields.array);
-   } else if (type->is_record()) {
-      for (unsigned int i = 0; i < type->length; i++) {
-	 if (type_contains_sampler(type->fields.structure[i].type))
-	    return true;
-      }
-      return false;
-   } else {
-      return type->is_sampler();
-   }
-}
-
 bool
 ir_dereference::is_lvalue()
 {
@@ -1129,7 +1114,7 @@ ir_dereference::is_lvalue()
     *     as out or inout function parameters, nor can they be
     *     assigned into."
     */
-   if (type_contains_sampler(this->type))
+   if (this->type->contains_sampler())
       return false;
 
    return true;