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diff --git a/gfx/angle/src/compiler/translator/blocklayoutHLSL.h b/gfx/angle/src/compiler/translator/blocklayoutHLSL.h
new file mode 100755
index 000000000..8d98847bd
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+++ b/gfx/angle/src/compiler/translator/blocklayoutHLSL.h
@@ -0,0 +1,61 @@
+//
+// Copyright (c) 2013-2014 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.
+//
+// blocklayout.h:
+//   Methods and classes related to uniform layout and packing in GLSL and HLSL.
+//
+
+#ifndef COMMON_BLOCKLAYOUTHLSL_H_
+#define COMMON_BLOCKLAYOUTHLSL_H_
+
+#include <cstddef>
+#include <vector>
+
+#include "angle_gl.h"
+#include "blocklayout.h"
+#include <GLSLANG/ShaderLang.h>
+
+namespace sh
+{
+// Block layout packed according to the D3D9 or default D3D10+ register packing rules
+// See http://msdn.microsoft.com/en-us/library/windows/desktop/bb509632(v=vs.85).aspx
+// The strategy should be ENCODE_LOOSE for D3D9 constant blocks, and ENCODE_PACKED
+// for everything else (D3D10+ constant blocks and all attributes/varyings).
+
+class HLSLBlockEncoder : public BlockLayoutEncoder
+{
+  public:
+    enum HLSLBlockEncoderStrategy
+    {
+        ENCODE_PACKED,
+        ENCODE_LOOSE
+    };
+
+    HLSLBlockEncoder(HLSLBlockEncoderStrategy strategy);
+
+    virtual void enterAggregateType();
+    virtual void exitAggregateType();
+    void skipRegisters(unsigned int numRegisters);
+
+    bool isPacked() const { return mEncoderStrategy == ENCODE_PACKED; }
+    void setTransposeMatrices(bool enabled) { mTransposeMatrices = enabled; }
+
+    static HLSLBlockEncoderStrategy GetStrategyFor(ShShaderOutput outputType);
+
+  protected:
+    virtual void getBlockLayoutInfo(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int *arrayStrideOut, int *matrixStrideOut);
+    virtual void advanceOffset(GLenum type, unsigned int arraySize, bool isRowMajorMatrix, int arrayStride, int matrixStride);
+
+    HLSLBlockEncoderStrategy mEncoderStrategy;
+    bool mTransposeMatrices;
+};
+
+// This method returns the number of used registers for a ShaderVariable. It is dependent on the HLSLBlockEncoder
+// class to count the number of used registers in a struct (which are individually packed according to the same rules).
+unsigned int HLSLVariableRegisterCount(const Varying &variable, bool transposeMatrices);
+unsigned int HLSLVariableRegisterCount(const Uniform &variable, ShShaderOutput outputType);
+}
+
+#endif // COMMON_BLOCKLAYOUTHLSL_H_