Only initialize through a temporary variable if the same symbol name is used in the initialization expression.
TRAC #13627
The previous patch can generate a lot of unnecessary temporary variables. By first checking whether the same symbol name is reused the clutter is reduced to an absolute minimum (typical shaders won't rely on this odd GLSL semantic behavior so the workaround is hardly ever needed).
Signed-off-by: Daniel Koch
Author: Nicolas Capens
git-svn-id: https://angleproject.googlecode.com/svn/trunk@479 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/compiler/SearchSymbol.cpp b/src/compiler/SearchSymbol.cpp
new file mode 100644
index 0000000..9368f1a
--- /dev/null
+++ b/src/compiler/SearchSymbol.cpp
@@ -0,0 +1,38 @@
+//
+// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// SearchSymbol is an AST traverser to detect the use of a given symbol name
+//
+
+#include "compiler/SearchSymbol.h"
+
+#include "compiler/InfoSink.h"
+#include "compiler/OutputHLSL.h"
+
+namespace sh
+{
+SearchSymbol::SearchSymbol(const TString &symbol) : mSymbol(symbol)
+{
+ match = false;
+}
+
+void SearchSymbol::traverse(TIntermNode *node)
+{
+ node->traverse(this);
+}
+
+void SearchSymbol::visitSymbol(TIntermSymbol *symbolNode)
+{
+ if (symbolNode->getSymbol() == mSymbol)
+ {
+ match = true;
+ }
+}
+
+bool SearchSymbol::foundMatch() const
+{
+ return match;
+}
+}