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-rw-r--r--gfx/angle/src/compiler/translator/AddAndTrueToLoopCondition.cpp59
1 files changed, 59 insertions, 0 deletions
diff --git a/gfx/angle/src/compiler/translator/AddAndTrueToLoopCondition.cpp b/gfx/angle/src/compiler/translator/AddAndTrueToLoopCondition.cpp
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+++ b/gfx/angle/src/compiler/translator/AddAndTrueToLoopCondition.cpp
@@ -0,0 +1,59 @@
+//
+// Copyright (c) 2016 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.
+//
+
+#include "compiler/translator/AddAndTrueToLoopCondition.h"
+
+#include "compiler/translator/IntermNode.h"
+
+namespace sh
+{
+
+namespace
+{
+
+// An AST traverser that rewrites for and while loops by replacing "condition" with
+// "condition && true" to work around condition bug on Intel Mac.
+class AddAndTrueToLoopConditionTraverser : public TIntermTraverser
+{
+ public:
+ AddAndTrueToLoopConditionTraverser() : TIntermTraverser(true, false, false) {}
+
+ bool visitLoop(Visit, TIntermLoop *loop) override
+ {
+ // do-while loop doesn't have this bug.
+ if (loop->getType() != ELoopFor && loop->getType() != ELoopWhile)
+ {
+ return true;
+ }
+
+ // For loop may not have a condition.
+ if (loop->getCondition() == nullptr)
+ {
+ return true;
+ }
+
+ // Constant true.
+ TConstantUnion *trueConstant = new TConstantUnion();
+ trueConstant->setBConst(true);
+ TIntermTyped *trueValue = new TIntermConstantUnion(trueConstant, TType(EbtBool));
+
+ // CONDITION && true.
+ TIntermBinary *andOp = new TIntermBinary(EOpLogicalAnd, loop->getCondition(), trueValue);
+ loop->setCondition(andOp);
+
+ return true;
+ }
+};
+
+} // anonymous namespace
+
+void AddAndTrueToLoopCondition(TIntermNode *root)
+{
+ AddAndTrueToLoopConditionTraverser traverser;
+ root->traverse(&traverser);
+}
+
+} // namespace sh