1 files changed, 112 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexDataManager.h b/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexDataManager.h
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index 0000000000..53bfc721da
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+++ b/gfx/angle/checkout/src/libANGLE/renderer/d3d/IndexDataManager.h
@@ -0,0 +1,112 @@
+//
+// 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.
+//
+
+// IndexDataManager.h: Defines the IndexDataManager, a class that
+// runs the Buffer translation process for index buffers.
+
+#ifndef LIBANGLE_INDEXDATAMANAGER_H_
+#define LIBANGLE_INDEXDATAMANAGER_H_
+
+#include <GLES2/gl2.h>
+
+#include "common/angleutils.h"
+#include "common/mathutil.h"
+#include "libANGLE/Error.h"
+#include "libANGLE/renderer/d3d/RendererD3D.h"
+
+namespace
+{
+enum
+{
+    INITIAL_INDEX_BUFFER_SIZE = 4096 * sizeof(GLuint)
+};
+}
+
+namespace gl
+{
+class Buffer;
+}
+
+namespace rx
+{
+class IndexBufferInterface;
+class StaticIndexBufferInterface;
+class StreamingIndexBufferInterface;
+class IndexBuffer;
+class BufferD3D;
+class RendererD3D;
+
+struct SourceIndexData
+{
+    BufferD3D *srcBuffer;
+    const void *srcIndices;
+    unsigned int srcCount;
+    gl::DrawElementsType srcIndexType;
+    bool srcIndicesChanged;
+};
+
+struct TranslatedIndexData
+{
+    unsigned int startIndex;
+    unsigned int startOffset;  // In bytes
+
+    IndexBuffer *indexBuffer;
+    BufferD3D *storage;
+    gl::DrawElementsType indexType;
+    unsigned int serial;
+
+    SourceIndexData srcIndexData;
+};
+
+class IndexDataManager : angle::NonCopyable
+{
+  public:
+    explicit IndexDataManager(BufferFactoryD3D *factory);
+    virtual ~IndexDataManager();
+
+    void deinitialize();
+
+    angle::Result prepareIndexData(const gl::Context *context,
+                                   gl::DrawElementsType srcType,
+                                   gl::DrawElementsType dstType,
+                                   GLsizei count,
+                                   gl::Buffer *glBuffer,
+                                   const void *indices,
+                                   TranslatedIndexData *translated);
+
+  private:
+    angle::Result streamIndexData(const gl::Context *context,
+                                  const void *data,
+                                  unsigned int count,
+                                  gl::DrawElementsType srcType,
+                                  gl::DrawElementsType dstType,
+                                  bool usePrimitiveRestartFixedIndex,
+                                  TranslatedIndexData *translated);
+    angle::Result getStreamingIndexBuffer(const gl::Context *context,
+                                          gl::DrawElementsType destinationIndexType,
+                                          IndexBufferInterface **outBuffer);
+
+    using StreamingBuffer = std::unique_ptr<StreamingIndexBufferInterface>;
+
+    BufferFactoryD3D *const mFactory;
+    std::unique_ptr<StreamingIndexBufferInterface> mStreamingBufferShort;
+    std::unique_ptr<StreamingIndexBufferInterface> mStreamingBufferInt;
+};
+
+angle::Result GetIndexTranslationDestType(const gl::Context *context,
+                                          GLsizei indexCount,
+                                          gl::DrawElementsType indexType,
+                                          const void *indices,
+                                          bool usePrimitiveRestartWorkaround,
+                                          gl::DrawElementsType *destTypeOut);
+
+ANGLE_INLINE bool IsOffsetAligned(gl::DrawElementsType elementType, unsigned int offset)
+{
+    return (offset % gl::GetDrawElementsTypeSize(elementType) == 0);
+}
+}  // namespace rx
+
+#endif  // LIBANGLE_INDEXDATAMANAGER_H_