Method GetChannel

GTE/Graphics/VertexBuffer.cpp:40–70

}

char* VertexBuffer::GetChannel(VASemantic semantic, uint32_t unit,
    std::set<DFType> const& requiredTypes)
{
    char* data = (mSBuffer == nullptr ? mData : mSBuffer->GetData());
    if (!data)
    {
        // The system memory copy does not exist.  You need to recreate it
        // before populating it.
        return nullptr;
    }

    int32_t index = mVFormat.GetIndex(semantic, unit);
    if (index < 0)
    {
        // The buffer does not have the specified semantic that uses the
        // specified unit.
        return nullptr;
    }

    DFType type = mVFormat.GetType(index);
    if (requiredTypes.size() > 0)
    {
        if (requiredTypes.find(type) == requiredTypes.end())
        {
            // The type of the semantic is not in the set of required types.
            return nullptr;
        }
    }

    return data + mVFormat.GetOffset(index);
}