1 files changed, 43 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/translator/RemoveInvariantDeclaration.cpp b/src/3rdparty/angle/src/compiler/translator/RemoveInvariantDeclaration.cpp
new file mode 100644
index 0000000000..4b533dc7b5
--- /dev/null
+++ b/src/3rdparty/angle/src/compiler/translator/RemoveInvariantDeclaration.cpp
@@ -0,0 +1,43 @@
+//
+// 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/RemoveInvariantDeclaration.h"
+
+#include "compiler/translator/IntermTraverse.h"
+
+namespace sh
+{
+
+namespace
+{
+
+// An AST traverser that removes invariant declaration for input in fragment shader
+// when GLSL >= 4.20 and for output in vertex shader when GLSL < 4.2.
+class RemoveInvariantDeclarationTraverser : public TIntermTraverser
+{
+  public:
+    RemoveInvariantDeclarationTraverser() : TIntermTraverser(true, false, false) {}
+
+  private:
+    bool visitInvariantDeclaration(Visit visit, TIntermInvariantDeclaration *node) override
+    {
+        TIntermSequence emptyReplacement;
+        mMultiReplacements.push_back(
+            NodeReplaceWithMultipleEntry(getParentNode()->getAsBlock(), node, emptyReplacement));
+        return false;
+    }
+};
+
+}  // anonymous namespace
+
+void RemoveInvariantDeclaration(TIntermNode *root)
+{
+    RemoveInvariantDeclarationTraverser traverser;
+    root->traverse(&traverser);
+    traverser.updateTree();
+}
+
+}  // namespace sh