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
new file mode 100644
index 000000000..0177fea96
--- /dev/null
+++ 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