Exemple #1
0
ViewerBase::ThreadingModel ViewerBase::suggestBestThreadingModel()
{
    const char* str = getenv("OSG_THREADING");
    if (str)
    {
        if (strcmp(str,"SingleThreaded")==0) return SingleThreaded;
        else if (strcmp(str,"CullDrawThreadPerContext")==0) return CullDrawThreadPerContext;
        else if (strcmp(str,"DrawThreadPerContext")==0) return DrawThreadPerContext;
        else if (strcmp(str,"CullThreadPerCameraDrawThreadPerContext")==0) return CullThreadPerCameraDrawThreadPerContext;
    }

    Contexts contexts;
    getContexts(contexts);

    if (contexts.empty()) return SingleThreaded;

#if 0
    // temporary hack to disable multi-threading under Windows till we find good solutions for
    // crashes that users are seeing.
    return SingleThreaded;
#endif

    Cameras cameras;
    getCameras(cameras);

    if (cameras.empty()) return SingleThreaded;


    int numProcessors = OpenThreads::GetNumberOfProcessors();

    if (contexts.size()==1)
    {
        if (numProcessors==1) return SingleThreaded;
        else return DrawThreadPerContext;
    }

#if 1
    if (numProcessors >= static_cast<int>(cameras.size()+contexts.size()))
    {
        return CullThreadPerCameraDrawThreadPerContext;
    }
#endif

    return DrawThreadPerContext;
}