C++ VisWindow::GetBackgroundMode方法代码示例

// ****************************************************************************
//  Method: RenderTranslucent
//
//  Purpose: Renders translucent geometry within a VisWindow.
//           Expects that opaque geometry has already been rendered.  In the
//           IceT case, our work is a lot simpler because we don't need to
//           read the image back from the framebuffer (we'll read it back from
//           IceT later anyway).
//
//  Programmer: Tom Fogal
//  Creation:   August 4, 2008
//
//  Modifications:
//
// ****************************************************************************
avtDataObject_p
IceTNetworkManager::RenderTranslucent(int windowID, const avtImage_p& input)
{
    VisWindow *viswin = viswinMap.find(windowID)->second.viswin;
    CallProgressCallback("IceTNetworkManager", "Transparent rendering", 0, 1);
    {
        StackTimer second_pass("Second-pass screen capture for SR");

        //
        // We have to disable any gradient background before
        // rendering, as those will overwrite the first pass
        //
        AnnotationAttributes::BackgroundMode bm = viswin->GetBackgroundMode();
        viswin->SetBackgroundMode(AnnotationAttributes::Solid);

        viswin->ScreenRender(
            this->r_mgmt.viewportedMode,
            true,   // Z buffer
            false,  // opaque geometry
            true,   // translucent geometry
            input   // image to composite with
        );

        // Restore the background mode for next time
        viswin->SetBackgroundMode(bm);
    }
    CallProgressCallback("IceTNetworkManager", "Transparent rendering", 1, 1);

    //
    // In this implementation, the user should never use the return value --
    // read it back from IceT instead!
    //
    return NULL;
}

avtDataObject_p
IceTNetworkManager::Render(
    bool checkThreshold, intVector networkIds,
    bool getZBuffer, int annotMode, int windowID,
    bool leftEye)
{
    int t0 = visitTimer->StartTimer();
    DataNetwork *origWorkingNet = workingNet;
    avtDataObject_p retval;

    EngineVisWinInfo &viswinInfo = viswinMap[windowID];
    viswinInfo.markedForDeletion = false;
    VisWindow *viswin = viswinInfo.viswin;
    std::vector<avtPlot_p>& imageBasedPlots = viswinInfo.imageBasedPlots;

    renderings = 0;

    TRY
    {
        this->StartTimer();

        RenderSetup(windowID, networkIds, getZBuffer,
            annotMode, leftEye, checkThreshold);

        bool plotDoingTransparencyOutsideTransparencyActor = false;
        for(size_t i = 0 ; i < networkIds.size() ; i++)
        {
            workingNet = NULL;
            UseNetwork(networkIds[i]);
            if(this->workingNet->GetPlot()->ManagesOwnTransparency())
            {
                plotDoingTransparencyOutsideTransparencyActor = true;
            }
        }
        workingNet = NULL;

        // We can't easily figure out a compositing order, which IceT requires
        // in order to properly composite transparent geometry.  Thus if there
        // is some transparency, fallback to our parent implementation.
        avtTransparencyActor* trans = viswin->GetTransparencyActor();
        bool transparenciesExist = trans->TransparenciesExist()
                           ||  plotDoingTransparencyOutsideTransparencyActor;
        if (transparenciesExist)
        {
            debug2 << "Encountered transparency: falling back to old "
                      "SR / compositing routines." << std::endl;

            retval = NetworkManager::RenderInternal();
        }
        else
        {
            bool needZB = !imageBasedPlots.empty() ||
                          renderState.shadowMap  ||
                          renderState.depthCues;

            // Confusingly, we need to set the input to be *opposite* of what VisIt
            // wants.  This is due to (IMHO) poor naming in the IceT case; on the
            // input side:
            //     ICET_DEPTH_BUFFER_BIT set:     do Z-testing
            //     ICET_DEPTH_BUFFER_BIT not set: do Z-based compositing.
            // On the output side:
            //     ICET_DEPTH_BUFFER_BIT set:     readback of Z buffer is allowed
            //     ICET_DEPTH_BUFFER_BIT not set: readback of Z does not work.
            // In VisIt's case, we calculated a `need Z buffer' predicate based
            // around the idea that we need the Z buffer to do Z-compositing.
            // However, IceT \emph{always} needs the Z buffer internally -- the
            // flag only differentiates between `compositing' methodologies
            // (painter-style or `over' operator) on input.
            GLenum inputs = ICET_COLOR_BUFFER_BIT;
            GLenum outputs = ICET_COLOR_BUFFER_BIT;
            // Scratch all that, I guess.  That might be the correct way to go
            // about things in the long run, but IceT only gives us back half an
            // image if we don't set the depth buffer bit.  The compositing is a
            // bit wrong, but there's not much else we can do..
            // Consider removing the `hack' if a workaround is found.
            if (/*hack*/true/*hack*/) // || !this->MemoMultipass(viswin))
            {
                inputs |= ICET_DEPTH_BUFFER_BIT;
            }
            if(needZB)
            {
                outputs |= ICET_DEPTH_BUFFER_BIT;
            }
            ICET(icetInputOutputBuffers(inputs, outputs));

            // If there is a backdrop image, we need to tell IceT so that it can
            // composite correctly.
            if(viswin->GetBackgroundMode() != AnnotationAttributes::Solid)
            {
                ICET(icetEnable(ICET_CORRECT_COLORED_BACKGROUND));
            }
            else
            {
                ICET(icetDisable(ICET_CORRECT_COLORED_BACKGROUND));
            }

            if (renderState.renderOnViewer)
            {
                RenderCleanup();
                avtDataObject_p dobj = NULL;
//.........这里部分代码省略.........