1 files changed, 125 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexBuffer.h b/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexBuffer.h
new file mode 100644
index 0000000000..7bab52a9f0
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+++ b/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexBuffer.h
@@ -0,0 +1,125 @@
+//
+// Copyright 2002 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 LIBANGLE_RENDERER_D3D_INDEXBUFFER_H_
+#define LIBANGLE_RENDERER_D3D_INDEXBUFFER_H_
+
+#include "common/PackedEnums.h"
+#include "common/angleutils.h"
+#include "libANGLE/Error.h"
+
+namespace gl
+{
+class Context;
+}  // namespace gl
+
+namespace rx
+{
+class BufferFactoryD3D;
+
+class IndexBuffer : angle::NonCopyable
+{
+  public:
+    IndexBuffer();
+    virtual ~IndexBuffer();
+
+    virtual angle::Result initialize(const gl::Context *context,
+                                     unsigned int bufferSize,
+                                     gl::DrawElementsType indexType,
+                                     bool dynamic) = 0;
+
+    virtual angle::Result mapBuffer(const gl::Context *context,
+                                    unsigned int offset,
+                                    unsigned int size,
+                                    void **outMappedMemory)       = 0;
+    virtual angle::Result unmapBuffer(const gl::Context *context) = 0;
+
+    virtual angle::Result discard(const gl::Context *context) = 0;
+
+    virtual gl::DrawElementsType getIndexType() const             = 0;
+    virtual unsigned int getBufferSize() const                    = 0;
+    virtual angle::Result setSize(const gl::Context *context,
+                                  unsigned int bufferSize,
+                                  gl::DrawElementsType indexType) = 0;
+
+    unsigned int getSerial() const;
+
+  protected:
+    void updateSerial();
+
+  private:
+    unsigned int mSerial;
+    static unsigned int mNextSerial;
+};
+
+class IndexBufferInterface : angle::NonCopyable
+{
+  public:
+    IndexBufferInterface(BufferFactoryD3D *factory, bool dynamic);
+    virtual ~IndexBufferInterface();
+
+    virtual angle::Result reserveBufferSpace(const gl::Context *context,
+                                             unsigned int size,
+                                             gl::DrawElementsType indexType) = 0;
+
+    gl::DrawElementsType getIndexType() const;
+    unsigned int getBufferSize() const;
+
+    unsigned int getSerial() const;
+
+    angle::Result mapBuffer(const gl::Context *context,
+                            unsigned int size,
+                            void **outMappedMemory,
+                            unsigned int *streamOffset);
+    angle::Result unmapBuffer(const gl::Context *context);
+
+    IndexBuffer *getIndexBuffer() const;
+
+  protected:
+    unsigned int getWritePosition() const;
+    void setWritePosition(unsigned int writePosition);
+
+    angle::Result discard(const gl::Context *context);
+
+    angle::Result setBufferSize(const gl::Context *context,
+                                unsigned int bufferSize,
+                                gl::DrawElementsType indexType);
+
+  private:
+    IndexBuffer *mIndexBuffer;
+
+    unsigned int mWritePosition;
+    bool mDynamic;
+};
+
+class StreamingIndexBufferInterface : public IndexBufferInterface
+{
+  public:
+    explicit StreamingIndexBufferInterface(BufferFactoryD3D *factory);
+    ~StreamingIndexBufferInterface() override;
+
+    angle::Result reserveBufferSpace(const gl::Context *context,
+                                     unsigned int size,
+                                     gl::DrawElementsType indexType) override;
+};
+
+class StaticIndexBufferInterface : public IndexBufferInterface
+{
+  public:
+    explicit StaticIndexBufferInterface(BufferFactoryD3D *factory);
+    ~StaticIndexBufferInterface() override;
+
+    angle::Result reserveBufferSpace(const gl::Context *context,
+                                     unsigned int size,
+                                     gl::DrawElementsType indexType) override;
+};
+
+}  // namespace rx
+
+#endif  // LIBANGLE_RENDERER_D3D_INDEXBUFFER_H_