IndexDataManager.cpp

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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.cpp
//
// 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.cpp: Defines the IndexDataManager, a class that
// runs the Buffer translation process for index buffers.

#include "libANGLE/renderer/d3d/IndexDataManager.h"

#include "common/utilities.h"
#include "libANGLE/Buffer.h"
#include "libANGLE/Context.h"
#include "libANGLE/VertexArray.h"
#include "libANGLE/formatutils.h"
#include "libANGLE/renderer/d3d/BufferD3D.h"
#include "libANGLE/renderer/d3d/IndexBuffer.h"

namespace rx
{

namespace
{

template <typename InputT, typename DestT>
void ConvertIndexArray(const void *input,
                       GLenum sourceType,
                       void *output,
                       GLenum destinationType,
                       GLsizei count,
                       bool usePrimitiveRestartFixedIndex)
{
    const InputT *in = static_cast<const InputT *>(input);
    DestT *out       = static_cast<DestT *>(output);

    if (usePrimitiveRestartFixedIndex)
    {
        InputT srcRestartIndex = static_cast<InputT>(gl::GetPrimitiveRestartIndex(sourceType));
        DestT destRestartIndex = static_cast<DestT>(gl::GetPrimitiveRestartIndex(destinationType));
        for (GLsizei i = 0; i < count; i++)
        {
            out[i] = (in[i] == srcRestartIndex ? destRestartIndex : static_cast<DestT>(in[i]));
        }
    }
    else
    {
        for (GLsizei i = 0; i < count; i++)
        {
            out[i] = static_cast<DestT>(in[i]);
        }
    }
}

void ConvertIndices(GLenum sourceType,
                    GLenum destinationType,
                    const void *input,
                    GLsizei count,
                    void *output,
                    bool usePrimitiveRestartFixedIndex)
{
    if (sourceType == destinationType)
    {
        const gl::Type &typeInfo = gl::GetTypeInfo(destinationType);
        memcpy(output, input, count * typeInfo.bytes);
        return;
    }

    if (sourceType == GL_UNSIGNED_BYTE)
    {
        ASSERT(destinationType == GL_UNSIGNED_SHORT);
        ConvertIndexArray<GLubyte, GLushort>(input, sourceType, output, destinationType, count,
                                             usePrimitiveRestartFixedIndex);
    }
    else if (sourceType == GL_UNSIGNED_SHORT)
    {
        ASSERT(destinationType == GL_UNSIGNED_INT);
        ConvertIndexArray<GLushort, GLuint>(input, sourceType, output, destinationType, count,
                                            usePrimitiveRestartFixedIndex);
    }
    else
        UNREACHABLE();
}

gl::Error StreamInIndexBuffer(IndexBufferInterface *buffer,
                              const void *data,
                              unsigned int count,
                              GLenum srcType,
                              GLenum dstType,
                              bool usePrimitiveRestartFixedIndex,
                              unsigned int *offset)
{
    const gl::Type &dstTypeInfo = gl::GetTypeInfo(dstType);

    if (count > (std::numeric_limits<unsigned int>::max() >> dstTypeInfo.bytesShift))
    {
        return gl::OutOfMemory() << "Reserving " << count << " indices of " << dstTypeInfo.bytes
                                 << " bytes each exceeds the maximum buffer size.";
    }

    unsigned int bufferSizeRequired = count << dstTypeInfo.bytesShift;
    gl::Error error                 = buffer->reserveBufferSpace(bufferSizeRequired, dstType);
    if (error.isError())
    {
        return error;
    }

    void *output = nullptr;
    error        = buffer->mapBuffer(bufferSizeRequired, &output, offset);
    if (error.isError())
    {
        return error;
    }

    ConvertIndices(srcType, dstType, data, count, output, usePrimitiveRestartFixedIndex);

    error = buffer->unmapBuffer();
    if (error.isError())
    {
        return error;
    }

    return gl::NoError();
}

}  // anonymous namespace

IndexDataManager::IndexDataManager(BufferFactoryD3D *factory, RendererClass rendererClass)
    : mFactory(factory),
      mRendererClass(rendererClass),
      mStreamingBufferShort(nullptr),
      mStreamingBufferInt(nullptr)
{
}

IndexDataManager::~IndexDataManager()
{
    SafeDelete(mStreamingBufferShort);
    SafeDelete(mStreamingBufferInt);
}

bool IndexDataManager::usePrimitiveRestartWorkaround(bool primitiveRestartFixedIndexEnabled,
                                                     GLenum type)
{
    // We should never have to deal with primitive restart workaround issue with GL_UNSIGNED_INT
    // indices, since we restrict it via MAX_ELEMENT_INDEX.
    return (!primitiveRestartFixedIndexEnabled && type == GL_UNSIGNED_SHORT &&
            mRendererClass == RENDERER_D3D11);
}

bool IndexDataManager::isStreamingIndexData(const gl::Context *context, GLenum srcType)
{
    const auto &glState = context->getGLState();
    bool primitiveRestartWorkaround =
        usePrimitiveRestartWorkaround(glState.isPrimitiveRestartEnabled(), srcType);
    gl::Buffer *glBuffer = glState.getVertexArray()->getElementArrayBuffer().get();

    // Case 1: the indices are passed by pointer, which forces the streaming of index data
    if (glBuffer == nullptr)
    {
        return true;
    }

    BufferD3D *buffer    = GetImplAs<BufferD3D>(glBuffer);
    const GLenum dstType = (srcType == GL_UNSIGNED_INT || primitiveRestartWorkaround)
                               ? GL_UNSIGNED_INT
                               : GL_UNSIGNED_SHORT;

    // Case 2a: the buffer can be used directly
    if (buffer->supportsDirectBinding() && dstType == srcType)
    {
        return false;
    }

    // Case 2b: use a static translated copy or fall back to streaming
    StaticIndexBufferInterface *staticBuffer = buffer->getStaticIndexBuffer();
    if (staticBuffer == nullptr)
    {
        return true;
    }

    if ((staticBuffer->getBufferSize() == 0) || (staticBuffer->getIndexType() != dstType))
    {
        return true;
    }

    return false;
}

// This function translates a GL-style indices into DX-style indices, with their description
// returned in translated.
// GL can specify vertex data in immediate mode (pointer to CPU array of indices), which is not
// possible in DX and requires streaming (Case 1). If the GL indices are specified with a buffer
// (Case 2), in a format supported by DX (subcase a) then all is good.
// When we have a buffer with an unsupported format (subcase b) then we need to do some translation:
// we will start by falling back to streaming, and after a while will start using a static
// translated copy of the index buffer.
gl::Error IndexDataManager::prepareIndexData(GLenum srcType,
                                             GLsizei count,
                                             gl::Buffer *glBuffer,
                                             const void *indices,
                                             TranslatedIndexData *translated,
                                             bool primitiveRestartFixedIndexEnabled)
{
    // Avoid D3D11's primitive restart index value
    // see http://msdn.microsoft.com/en-us/library/windows/desktop/bb205124(v=vs.85).aspx
    bool hasPrimitiveRestartIndex =
        translated->indexRange.vertexIndexCount < static_cast<size_t>(count) ||
        translated->indexRange.end == gl::GetPrimitiveRestartIndex(srcType);
    bool primitiveRestartWorkaround =
        usePrimitiveRestartWorkaround(primitiveRestartFixedIndexEnabled, srcType) &&
        hasPrimitiveRestartIndex;

    // We should never have to deal with MAX_UINT indices, since we restrict it via
    // MAX_ELEMENT_INDEX.
    ASSERT(!(mRendererClass == RENDERER_D3D11 && !primitiveRestartFixedIndexEnabled &&
             hasPrimitiveRestartIndex && srcType == GL_UNSIGNED_INT));

    const GLenum dstType = (srcType == GL_UNSIGNED_INT || primitiveRestartWorkaround)
                               ? GL_UNSIGNED_INT
                               : GL_UNSIGNED_SHORT;

    const gl::Type &srcTypeInfo = gl::GetTypeInfo(srcType);
    const gl::Type &dstTypeInfo = gl::GetTypeInfo(dstType);

    BufferD3D *buffer = glBuffer ? GetImplAs<BufferD3D>(glBuffer) : nullptr;

    translated->indexType                 = dstType;
    translated->srcIndexData.srcBuffer    = buffer;
    translated->srcIndexData.srcIndices   = indices;
    translated->srcIndexData.srcIndexType = srcType;
    translated->srcIndexData.srcCount     = count;

    // Case 1: the indices are passed by pointer, which forces the streaming of index data
    if (glBuffer == nullptr)
    {
        translated->storage = nullptr;
        return streamIndexData(indices, count, srcType, dstType, primitiveRestartFixedIndexEnabled,
                               translated);
    }

    // Case 2: the indices are already in a buffer
    unsigned int offset = static_cast<unsigned int>(reinterpret_cast<uintptr_t>(indices));
    ASSERT(srcTypeInfo.bytes * static_cast<unsigned int>(count) + offset <= buffer->getSize());

    bool offsetAligned;
    switch (srcType)
    {
        case GL_UNSIGNED_BYTE:
            offsetAligned = (offset % sizeof(GLubyte) == 0);
            break;
        case GL_UNSIGNED_SHORT:
            offsetAligned = (offset % sizeof(GLushort) == 0);
            break;
        case GL_UNSIGNED_INT:
            offsetAligned = (offset % sizeof(GLuint) == 0);
            break;
        default:
            UNREACHABLE();
            offsetAligned = false;
    }

    // Case 2a: the buffer can be used directly
    if (offsetAligned && buffer->supportsDirectBinding() && dstType == srcType)
    {
        translated->storage     = buffer;
        translated->indexBuffer = nullptr;
        translated->serial      = buffer->getSerial();
        translated->startIndex  = (offset >> srcTypeInfo.bytesShift);
        translated->startOffset = offset;
        return gl::NoError();
    }
    else
    {
        translated->storage = nullptr;
    }

    // Case 2b: use a static translated copy or fall back to streaming
    StaticIndexBufferInterface *staticBuffer = buffer->getStaticIndexBuffer();

    bool staticBufferInitialized = staticBuffer && staticBuffer->getBufferSize() != 0;
    bool staticBufferUsable =
        staticBuffer && offsetAligned && staticBuffer->getIndexType() == dstType;

    if (staticBufferInitialized && !staticBufferUsable)
    {
        buffer->invalidateStaticData();
        staticBuffer = nullptr;
    }

    if (staticBuffer == nullptr || !offsetAligned)
    {
        const uint8_t *bufferData = nullptr;
        gl::Error error           = buffer->getData(&bufferData);
        if (error.isError())
        {
            return error;
        }
        ASSERT(bufferData != nullptr);

        error = streamIndexData(bufferData + offset, count, srcType, dstType,
                                primitiveRestartFixedIndexEnabled, translated);
        if (error.isError())
        {
            return error;
        }
        buffer->promoteStaticUsage(count << srcTypeInfo.bytesShift);
    }
    else
    {
        if (!staticBufferInitialized)
        {
            const uint8_t *bufferData = nullptr;
            gl::Error error           = buffer->getData(&bufferData);
            if (error.isError())
            {
                return error;
            }
            ASSERT(bufferData != nullptr);

            unsigned int convertCount =
                static_cast<unsigned int>(buffer->getSize()) >> srcTypeInfo.bytesShift;
            error = StreamInIndexBuffer(staticBuffer, bufferData, convertCount, srcType, dstType,
                                        primitiveRestartFixedIndexEnabled, nullptr);
            if (error.isError())
            {
                return error;
            }
        }
        ASSERT(offsetAligned && staticBuffer->getIndexType() == dstType);

        translated->indexBuffer = staticBuffer->getIndexBuffer();
        translated->serial      = staticBuffer->getSerial();
        translated->startIndex  = (offset >> srcTypeInfo.bytesShift);
        translated->startOffset = (offset >> srcTypeInfo.bytesShift) << dstTypeInfo.bytesShift;
    }

    return gl::NoError();
}

gl::Error IndexDataManager::streamIndexData(const void *data,
                                            unsigned int count,
                                            GLenum srcType,
                                            GLenum dstType,
                                            bool usePrimitiveRestartFixedIndex,
                                            TranslatedIndexData *translated)
{
    const gl::Type &dstTypeInfo = gl::GetTypeInfo(dstType);

    IndexBufferInterface *indexBuffer = nullptr;
    gl::Error error                   = getStreamingIndexBuffer(dstType, &indexBuffer);
    if (error.isError())
    {
        return error;
    }
    ASSERT(indexBuffer != nullptr);

    unsigned int offset;
    StreamInIndexBuffer(indexBuffer, data, count, srcType, dstType, usePrimitiveRestartFixedIndex,
                        &offset);

    translated->indexBuffer = indexBuffer->getIndexBuffer();
    translated->serial      = indexBuffer->getSerial();
    translated->startIndex  = (offset >> dstTypeInfo.bytesShift);
    translated->startOffset = offset;

    return gl::NoError();
}

gl::Error IndexDataManager::getStreamingIndexBuffer(GLenum destinationIndexType,
                                                    IndexBufferInterface **outBuffer)
{
    ASSERT(outBuffer);
    if (destinationIndexType == GL_UNSIGNED_INT)
    {
        if (!mStreamingBufferInt)
        {
            mStreamingBufferInt = new StreamingIndexBufferInterface(mFactory);
            gl::Error error =
                mStreamingBufferInt->reserveBufferSpace(INITIAL_INDEX_BUFFER_SIZE, GL_UNSIGNED_INT);
            if (error.isError())
            {
                SafeDelete(mStreamingBufferInt);
                return error;
            }
        }

        *outBuffer = mStreamingBufferInt;
        return gl::NoError();
    }
    else
    {
        ASSERT(destinationIndexType == GL_UNSIGNED_SHORT);

        if (!mStreamingBufferShort)
        {
            mStreamingBufferShort = new StreamingIndexBufferInterface(mFactory);
            gl::Error error = mStreamingBufferShort->reserveBufferSpace(INITIAL_INDEX_BUFFER_SIZE,
                                                                        GL_UNSIGNED_SHORT);
            if (error.isError())
            {
                SafeDelete(mStreamingBufferShort);
                return error;
            }
        }

        *outBuffer = mStreamingBufferShort;
        return gl::NoError();
    }
}
}
kc3-lang/angle/src/libANGLE/renderer/d3d/IndexDataManager.cpp

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