glsl2: Add some comments.
diff --git a/src/glsl/ast_function.cpp b/src/glsl/ast_function.cpp
index 2348bdf..1122521 100644
--- a/src/glsl/ast_function.cpp
+++ b/src/glsl/ast_function.cpp
@@ -164,6 +164,9 @@
/**
* Perform automatic type conversion of constructor parameters
+ *
+ * This implements the rules in the "Conversion and Scalar Constructors"
+ * section (GLSL 1.10 section 5.4.1), not the "Implicit Conversions" rules.
*/
static ir_rvalue *
convert_component(ir_rvalue *src, const glsl_type *desired_type)
@@ -220,11 +223,11 @@
assert(result != NULL);
+ /* Try constant folding; it may fold in the conversion we just added. */
ir_constant *const constant = result->constant_expression_value();
return (constant != NULL) ? (ir_rvalue *) constant : (ir_rvalue *) result;
}
-
/**
* Dereference a specific component from a scalar, vector, or matrix
*/