IndexDataManager.h

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Author : Qin Jiajia
Date : 2017-06-20 17:16:25
Hash : 1da00653
Message : Remove IndexRange in DrawElements functions This change will remove IndexRange parameter in DrawElements functions. And calculate it until we truly need it. Meanwhile we add direct drawing path to avoid retrieving index range for DrawElements* functions in D3D11 backend. This change may not bring much performance improvement since we still need to retrieve index range in validation at the beginning of every DrawElements* call entry point. BUG=angleproject:1393 Change-Id: I86a8739c0893954c94eb398db62820ced7871565 Reviewed-on: https://chromium-review.googlesource.com/544634 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

src/libANGLE/renderer/d3d/IndexDataManager.h

//
// Copyright (c) 2002-2014 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.
//

// 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;
    GLenum srcIndexType;
    bool srcIndicesChanged;
};

struct TranslatedIndexData
{
    gl::IndexRange indexRange;
    unsigned int startIndex;
    unsigned int startOffset;  // In bytes

    IndexBuffer *indexBuffer;
    BufferD3D *storage;
    GLenum indexType;
    unsigned int serial;

    SourceIndexData srcIndexData;
};

class IndexDataManager : angle::NonCopyable
{
  public:
    explicit IndexDataManager(BufferFactoryD3D *factory, RendererClass rendererClass);
    virtual ~IndexDataManager();

    bool usePrimitiveRestartWorkaround(bool primitiveRestartFixedIndexEnabled, GLenum type);
    bool isStreamingIndexData(const gl::Context *context, GLenum srcType);
    gl::Error prepareIndexData(GLenum srcType,
                               GLsizei count,
                               gl::Buffer *glBuffer,
                               const void *indices,
                               TranslatedIndexData *translated,
                               bool primitiveRestartFixedIndexEnabled);

  private:
    gl::Error streamIndexData(const void *data,
                              unsigned int count,
                              GLenum srcType,
                              GLenum dstType,
                              bool usePrimitiveRestartFixedIndex,
                              TranslatedIndexData *translated);
    gl::Error getStreamingIndexBuffer(GLenum destinationIndexType,
                                      IndexBufferInterface **outBuffer);

    BufferFactoryD3D *const mFactory;
    RendererClass mRendererClass;
    StreamingIndexBufferInterface *mStreamingBufferShort;
    StreamingIndexBufferInterface *mStreamingBufferInt;
};
}

#endif  // LIBANGLE_INDEXDATAMANAGER_H_

kc3-lang/angle/src/libANGLE/renderer/d3d/IndexDataManager.h

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kc3-lang/angle /src/libANGLE/renderer/d3d/IndexDataManager.h