Beispiel #1
0
gl::Error IndexDataManager::prepareIndexData(GLenum type, GLsizei count, gl::Buffer *buffer, const GLvoid *indices, TranslatedIndexData *translated)
{
    const gl::Type &typeInfo = gl::GetTypeInfo(type);

    GLenum destinationIndexType = (type == GL_UNSIGNED_INT) ? GL_UNSIGNED_INT : GL_UNSIGNED_SHORT;

    unsigned int offset = 0;
    bool alignedOffset = false;

    BufferD3D *storage = NULL;

    if (buffer != NULL)
    {
        offset = static_cast<unsigned int>(reinterpret_cast<uintptr_t>(indices));

        storage = GetImplAs<BufferD3D>(buffer);

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

        ASSERT(typeInfo.bytes * static_cast<unsigned int>(count) + offset <= storage->getSize());

        const uint8_t *bufferData = NULL;
        gl::Error error = storage->getData(&bufferData);
        if (error.isError())
        {
            return error;
        }

        indices = bufferData + offset;
    }

    StaticIndexBufferInterface *staticBuffer = storage ? storage->getStaticIndexBuffer() : NULL;
    IndexBufferInterface *indexBuffer = NULL;
    bool directStorage = alignedOffset && storage && storage->supportsDirectBinding() &&
                         destinationIndexType == type;
    unsigned int streamOffset = 0;

    if (directStorage)
    {
        streamOffset = offset;

        if (!buffer->getIndexRangeCache()->findRange(type, offset, count, NULL, NULL))
        {
            buffer->getIndexRangeCache()->addRange(type, offset, count, translated->indexRange, offset);
        }
    }
    else if (staticBuffer && staticBuffer->getBufferSize() != 0 && staticBuffer->getIndexType() == type && alignedOffset)
    {
        indexBuffer = staticBuffer;

        if (!staticBuffer->getIndexRangeCache()->findRange(type, offset, count, NULL, &streamOffset))
        {
            streamOffset = (offset / typeInfo.bytes) * gl::GetTypeInfo(destinationIndexType).bytes;
            staticBuffer->getIndexRangeCache()->addRange(type, offset, count, translated->indexRange, streamOffset);
        }
    }

    // Avoid D3D11's primitive restart index value
    // see http://msdn.microsoft.com/en-us/library/windows/desktop/bb205124(v=vs.85).aspx
    if (translated->indexRange.end == 0xFFFF && type == GL_UNSIGNED_SHORT && mRenderer->getMajorShaderModel() > 3)
    {
        destinationIndexType = GL_UNSIGNED_INT;
        directStorage = false;
        indexBuffer = NULL;
    }

    const gl::Type &destTypeInfo = gl::GetTypeInfo(destinationIndexType);

    if (!directStorage && !indexBuffer)
    {
        gl::Error error = getStreamingIndexBuffer(destinationIndexType, &indexBuffer);
        if (error.isError())
        {
            return error;
        }

        unsigned int convertCount = count;

        if (staticBuffer)
        {
            if (staticBuffer->getBufferSize() == 0 && alignedOffset)
            {
                indexBuffer = staticBuffer;
                convertCount = storage->getSize() / typeInfo.bytes;
            }
            else
            {
                storage->invalidateStaticData();
                staticBuffer = NULL;
            }
        }

        ASSERT(indexBuffer);

        if (convertCount > std::numeric_limits<unsigned int>::max() / destTypeInfo.bytes)
        {
            return gl::Error(GL_OUT_OF_MEMORY, "Reserving %u indices of %u bytes each exceeds the maximum buffer size.",
                             convertCount, destTypeInfo.bytes);
        }

        unsigned int bufferSizeRequired = convertCount * destTypeInfo.bytes;
        error = indexBuffer->reserveBufferSpace(bufferSizeRequired, type);
        if (error.isError())
        {
            return error;
        }

        void* output = NULL;
        error = indexBuffer->mapBuffer(bufferSizeRequired, &output, &streamOffset);
        if (error.isError())
        {
            return error;
        }

        const uint8_t *dataPointer = reinterpret_cast<const uint8_t*>(indices);
        if (staticBuffer)
        {
            error = storage->getData(&dataPointer);
            if (error.isError())
            {
                return error;
            }
        }
        ConvertIndices(type, destinationIndexType, dataPointer, convertCount, output);

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

        if (staticBuffer)
        {
            streamOffset = (offset / typeInfo.bytes) * destTypeInfo.bytes;
            staticBuffer->getIndexRangeCache()->addRange(type, offset, count, translated->indexRange, streamOffset);
        }
    }

    translated->storage = directStorage ? storage : NULL;
    translated->indexBuffer = indexBuffer ? indexBuffer->getIndexBuffer() : NULL;
    translated->serial = directStorage ? storage->getSerial() : indexBuffer->getSerial();
    translated->startIndex = streamOffset / destTypeInfo.bytes;
    translated->startOffset = streamOffset;
    translated->indexType = destinationIndexType;

    if (storage)
    {
        storage->promoteStaticUsage(count * typeInfo.bytes);
    }

    return gl::Error(GL_NO_ERROR);
}
GLenum IndexDataManager::prepareIndexData(GLenum type, GLsizei count, gl::Buffer *buffer, const GLvoid *indices, TranslatedIndexData *translated)
{
    if (!mStreamingBufferShort)
    {
        return GL_OUT_OF_MEMORY;
    }

    GLenum destinationIndexType = (type == GL_UNSIGNED_INT) ? GL_UNSIGNED_INT : GL_UNSIGNED_SHORT;
    unsigned int offset = 0;
    bool alignedOffset = false;

    BufferD3D *storage = NULL;

    if (buffer != NULL)
    {
        if (reinterpret_cast<uintptr_t>(indices) > std::numeric_limits<unsigned int>::max())
        {
            return GL_OUT_OF_MEMORY;
        }
        offset = static_cast<unsigned int>(reinterpret_cast<uintptr_t>(indices));

        storage = BufferD3D::makeBufferD3D(buffer->getImplementation());

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

        unsigned int typeSize = gl::GetTypeBytes(type);

        // check for integer overflows
        if (static_cast<unsigned int>(count) > (std::numeric_limits<unsigned int>::max() / typeSize) ||
            typeSize * static_cast<unsigned int>(count) + offset < offset)
        {
            return GL_OUT_OF_MEMORY;
        }

        if (typeSize * static_cast<unsigned int>(count) + offset > storage->getSize())
        {
            return GL_INVALID_OPERATION;
        }

        indices = static_cast<const GLubyte*>(storage->getData()) + offset;
    }

    StreamingIndexBufferInterface *streamingBuffer = (type == GL_UNSIGNED_INT) ? mStreamingBufferInt : mStreamingBufferShort;

    StaticIndexBufferInterface *staticBuffer = storage ? storage->getStaticIndexBuffer() : NULL;
    IndexBufferInterface *indexBuffer = streamingBuffer;
    bool directStorage = alignedOffset && storage && storage->supportsDirectBinding() &&
                         destinationIndexType == type;
    unsigned int streamOffset = 0;

    if (directStorage)
    {
        indexBuffer = streamingBuffer;
        streamOffset = offset;

        if (!storage->getIndexRangeCache()->findRange(type, offset, count, &translated->minIndex,
                                                     &translated->maxIndex, NULL))
        {
            computeRange(type, indices, count, &translated->minIndex, &translated->maxIndex);
            storage->getIndexRangeCache()->addRange(type, offset, count, translated->minIndex,
                                                   translated->maxIndex, offset);
        }
    }
    else if (staticBuffer && staticBuffer->getBufferSize() != 0 && staticBuffer->getIndexType() == type && alignedOffset)
    {
        indexBuffer = staticBuffer;

        if (!staticBuffer->getIndexRangeCache()->findRange(type, offset, count, &translated->minIndex,
                                                           &translated->maxIndex, &streamOffset))
        {
            streamOffset = (offset / gl::GetTypeBytes(type)) * gl::GetTypeBytes(destinationIndexType);
            computeRange(type, indices, count, &translated->minIndex, &translated->maxIndex);
            staticBuffer->getIndexRangeCache()->addRange(type, offset, count, translated->minIndex,
                                                         translated->maxIndex, streamOffset);
        }
    }
    else
    {
        unsigned int convertCount = count;

        if (staticBuffer)
        {
            if (staticBuffer->getBufferSize() == 0 && alignedOffset)
            {
                indexBuffer = staticBuffer;
                convertCount = storage->getSize() / gl::GetTypeBytes(type);
            }
            else
            {
                storage->invalidateStaticData();
                staticBuffer = NULL;
            }
        }

        if (!indexBuffer)
        {
            ERR("No valid index buffer.");
            return GL_INVALID_OPERATION;
        }

        unsigned int indexTypeSize = gl::GetTypeBytes(destinationIndexType);
        if (convertCount > std::numeric_limits<unsigned int>::max() / indexTypeSize)
        {
            ERR("Reserving %u indicies of %u bytes each exceeds the maximum buffer size.", convertCount, indexTypeSize);
            return GL_OUT_OF_MEMORY;
        }

        unsigned int bufferSizeRequired = convertCount * indexTypeSize;
        if (!indexBuffer->reserveBufferSpace(bufferSizeRequired, type))
        {
            ERR("Failed to reserve %u bytes in an index buffer.", bufferSizeRequired);
            return GL_OUT_OF_MEMORY;
        }

        void* output = NULL;
        if (!indexBuffer->mapBuffer(bufferSizeRequired, &output, &streamOffset))
        {
            ERR("Failed to map index buffer.");
            return GL_OUT_OF_MEMORY;
        }

        convertIndices(type, staticBuffer ? storage->getData() : indices, convertCount, output);

        if (!indexBuffer->unmapBuffer())
        {
            ERR("Failed to unmap index buffer.");
            return GL_OUT_OF_MEMORY;
        }

        computeRange(type, indices, count, &translated->minIndex, &translated->maxIndex);

        if (staticBuffer)
        {
            streamOffset = (offset / gl::GetTypeBytes(type)) * gl::GetTypeBytes(destinationIndexType);
            staticBuffer->getIndexRangeCache()->addRange(type, offset, count, translated->minIndex,
                                                         translated->maxIndex, streamOffset);
        }
    }

    translated->storage = directStorage ? storage : NULL;
    translated->indexBuffer = indexBuffer->getIndexBuffer();
    translated->serial = directStorage ? storage->getSerial() : indexBuffer->getSerial();
    translated->startIndex = streamOffset / gl::GetTypeBytes(destinationIndexType);
    translated->startOffset = streamOffset;

    if (storage)
    {
        storage->promoteStaticUsage(count * gl::GetTypeBytes(type));
    }

    return GL_NO_ERROR;
}