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diff --git a/gfx/angle/src/libANGLE/renderer/d3d/VaryingPacking.h b/gfx/angle/src/libANGLE/renderer/d3d/VaryingPacking.h
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+++ b/gfx/angle/src/libANGLE/renderer/d3d/VaryingPacking.h
@@ -0,0 +1,175 @@
+//
+// Copyright 2015 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.
+//
+// VaryingPacking:
+//   Class which describes a mapping from varyings to registers in D3D
+//   for linking between shader stages.
+//
+
+#ifndef LIBANGLE_RENDERER_D3D_VARYINGPACKING_H_
+#define LIBANGLE_RENDERER_D3D_VARYINGPACKING_H_
+
+#include "libANGLE/renderer/d3d/RendererD3D.h"
+
+namespace rx
+{
+class ProgramD3DMetadata;
+
+struct PackedVarying
+{
+    PackedVarying(const sh::ShaderVariable &varyingIn, sh::InterpolationType interpolationIn)
+        : varying(&varyingIn), vertexOnly(false), interpolation(interpolationIn)
+    {
+    }
+    PackedVarying(const sh::ShaderVariable &varyingIn,
+                  sh::InterpolationType interpolationIn,
+                  const std::string &parentStructNameIn)
+        : varying(&varyingIn),
+          vertexOnly(false),
+          interpolation(interpolationIn),
+          parentStructName(parentStructNameIn)
+    {
+    }
+
+    bool isStructField() const { return !parentStructName.empty(); }
+
+    const sh::ShaderVariable *varying;
+
+    // Transform feedback varyings can be only referenced in the VS.
+    bool vertexOnly;
+
+    // Cached so we can store sh::ShaderVariable to point to varying fields.
+    sh::InterpolationType interpolation;
+
+    // Struct name
+    std::string parentStructName;
+};
+
+struct PackedVaryingRegister final
+{
+    PackedVaryingRegister()
+        : packedVarying(nullptr),
+          varyingArrayIndex(0),
+          varyingRowIndex(0),
+          registerRow(0),
+          registerColumn(0)
+    {
+    }
+
+    PackedVaryingRegister(const PackedVaryingRegister &) = default;
+    PackedVaryingRegister &operator=(const PackedVaryingRegister &) = default;
+
+    bool operator<(const PackedVaryingRegister &other) const
+    {
+        return sortOrder() < other.sortOrder();
+    }
+
+    unsigned int sortOrder() const
+    {
+        // TODO(jmadill): Handle interpolation types
+        return registerRow * 4 + registerColumn;
+    }
+
+    bool isStructField() const { return !structFieldName.empty(); }
+
+    // Index to the array of varyings.
+    const PackedVarying *packedVarying;
+
+    // The array element of the packed varying.
+    unsigned int varyingArrayIndex;
+
+    // The row of the array element of the packed varying.
+    unsigned int varyingRowIndex;
+
+    // The register row to which we've assigned this packed varying.
+    unsigned int registerRow;
+
+    // The column of the register row into which we've packed this varying.
+    unsigned int registerColumn;
+
+    // Assigned after packing
+    unsigned int semanticIndex;
+
+    // Struct member this varying corresponds to.
+    std::string structFieldName;
+};
+
+class VaryingPacking final : angle::NonCopyable
+{
+  public:
+    VaryingPacking(GLuint maxVaryingVectors);
+
+    bool packVaryings(gl::InfoLog &infoLog,
+                      const std::vector<PackedVarying> &packedVaryings,
+                      const std::vector<std::string> &transformFeedbackVaryings);
+
+    struct Register
+    {
+        Register() { data[0] = data[1] = data[2] = data[3] = false; }
+
+        bool &operator[](unsigned int index) { return data[index]; }
+        bool operator[](unsigned int index) const { return data[index]; }
+
+        bool data[4];
+    };
+
+    Register &operator[](unsigned int index) { return mRegisterMap[index]; }
+    const Register &operator[](unsigned int index) const { return mRegisterMap[index]; }
+
+    const std::vector<PackedVaryingRegister> &getRegisterList() const { return mRegisterList; }
+    unsigned int getMaxSemanticIndex() const
+    {
+        return static_cast<unsigned int>(mRegisterList.size());
+    }
+    unsigned int getRegisterCount() const;
+
+    void enableBuiltins(ShaderType shaderType, const ProgramD3DMetadata &programMetadata);
+
+    struct BuiltinVarying final : angle::NonCopyable
+    {
+        BuiltinVarying();
+
+        std::string str() const;
+        void enableSystem(const std::string &systemValueSemantic);
+        void enable(const std::string &semanticVal, unsigned int indexVal);
+
+        bool enabled;
+        std::string semantic;
+        unsigned int index;
+        bool systemValue;
+    };
+
+    struct BuiltinInfo
+    {
+        BuiltinVarying dxPosition;
+        BuiltinVarying glPosition;
+        BuiltinVarying glFragCoord;
+        BuiltinVarying glPointCoord;
+        BuiltinVarying glPointSize;
+    };
+
+    const BuiltinInfo &builtins(ShaderType shaderType) const { return mBuiltinInfo[shaderType]; }
+
+    bool usesPointSize() const { return mBuiltinInfo[SHADER_VERTEX].glPointSize.enabled; }
+
+  private:
+    bool packVarying(const PackedVarying &packedVarying);
+    bool isFree(unsigned int registerRow,
+                unsigned int registerColumn,
+                unsigned int varyingRows,
+                unsigned int varyingColumns) const;
+    void insert(unsigned int registerRow,
+                unsigned int registerColumn,
+                const PackedVarying &packedVarying);
+
+    std::vector<Register> mRegisterMap;
+    std::vector<PackedVaryingRegister> mRegisterList;
+
+    std::vector<BuiltinInfo> mBuiltinInfo;
+};
+
+}  // namespace rx
+
+#endif  // LIBANGLE_RENDERER_D3D_VARYINGPACKING_H_