diff -r 000000000000 -r 6474c204b198 gfx/angle/src/libGLESv2/renderer/IndexBuffer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/libGLESv2/renderer/IndexBuffer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,111 @@
+//
+// Copyright (c) 2002-2012 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.
+//
+
+// IndexBuffer.h: Defines the abstract IndexBuffer class and IndexBufferInterface
+// class with derivations, classes that perform graphics API agnostic index buffer operations.
+
+#ifndef LIBGLESV2_RENDERER_INDEXBUFFER_H_
+#define LIBGLESV2_RENDERER_INDEXBUFFER_H_
+
+#include "common/angleutils.h"
+#include "libGLESv2/renderer/IndexRangeCache.h"
+
+namespace rx
+{
+class Renderer;
+
+class IndexBuffer
+{
+  public:
+    IndexBuffer();
+    virtual ~IndexBuffer();
+
+    virtual bool initialize(unsigned int bufferSize, GLenum indexType, bool dynamic) = 0;
+
+    virtual bool mapBuffer(unsigned int offset, unsigned int size, void** outMappedMemory) = 0;
+    virtual bool unmapBuffer() = 0;
+
+    virtual bool discard() = 0;
+
+    virtual GLenum getIndexType() const = 0;
+    virtual unsigned int getBufferSize() const = 0;
+    virtual bool setSize(unsigned int bufferSize, GLenum indexType) = 0;
+
+    unsigned int getSerial() const;
+
+  protected:
+    void updateSerial();
+
+  private:
+    DISALLOW_COPY_AND_ASSIGN(IndexBuffer);
+
+    unsigned int mSerial;
+    static unsigned int mNextSerial;
+};
+
+class IndexBufferInterface
+{
+  public:
+    IndexBufferInterface(Renderer *renderer, bool dynamic);
+    virtual ~IndexBufferInterface();
+
+    virtual bool reserveBufferSpace(unsigned int size, GLenum indexType) = 0;
+
+    GLenum getIndexType() const;
+    unsigned int getBufferSize() const;
+
+    unsigned int getSerial() const;
+
+    bool mapBuffer(unsigned int size, void** outMappedMemory, unsigned int *streamOffset);
+    bool unmapBuffer();
+
+    IndexBuffer *getIndexBuffer() const;
+
+  protected:
+    unsigned int getWritePosition() const;
+    void setWritePosition(unsigned int writePosition);
+
+    bool discard();
+
+    bool setBufferSize(unsigned int bufferSize, GLenum indexType);
+
+  private:
+    DISALLOW_COPY_AND_ASSIGN(IndexBufferInterface);
+
+    rx::Renderer *const mRenderer;
+
+    IndexBuffer* mIndexBuffer;
+
+    unsigned int mWritePosition;
+    bool mDynamic;
+};
+
+class StreamingIndexBufferInterface : public IndexBufferInterface
+{
+  public:
+    StreamingIndexBufferInterface(Renderer *renderer);
+    ~StreamingIndexBufferInterface();
+
+    virtual bool reserveBufferSpace(unsigned int size, GLenum indexType);
+};
+
+class StaticIndexBufferInterface : public IndexBufferInterface
+{
+  public:
+    explicit StaticIndexBufferInterface(Renderer *renderer);
+    ~StaticIndexBufferInterface();
+
+    virtual bool reserveBufferSpace(unsigned int size, GLenum indexType);
+
+    IndexRangeCache *getIndexRangeCache();
+
+  private:
+    IndexRangeCache mIndexRangeCache;
+};
+
+}
+
+#endif // LIBGLESV2_RENDERER_INDEXBUFFER_H_
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