Method paintGL

Gui/ViewerGL.cpp:271–532

};

void
ViewerGL::paintGL()
{
    // always running in the main thread
    assert( qApp && qApp->thread() == QThread::currentThread() );

    //if app is closing, just return
    if ( !_imp->viewerTab->getGui() ) {
        return;
    }
    glCheckError();


    {
        double screenPixelRatio = getScreenPixelRatio();
        if (screenPixelRatio != _imp->_screenPixelRatio) {
            _imp->_screenPixelRatio = screenPixelRatio;
            _imp->_textFont.reset(new QFont(appFont, appFontSize * screenPixelRatio));
        }
    }
    assert(_imp->_textFont);

    double zoomLeft, zoomRight, zoomBottom, zoomTop;
    {
        QMutexLocker l(&_imp->zoomCtxMutex);
        assert(0 < _imp->zoomCtx.factor() && _imp->zoomCtx.factor() <= 1024);
        zoomLeft = _imp->zoomCtx.left();
        zoomRight = _imp->zoomCtx.right();
        zoomBottom = _imp->zoomCtx.bottom();
        zoomTop = _imp->zoomCtx.top();
    }
    if ( (zoomLeft == zoomRight) || (zoomTop == zoomBottom) ) {
        clearColorBuffer( _imp->clearColor.redF(), _imp->clearColor.greenF(), _imp->clearColor.blueF(), _imp->clearColor.alphaF() );
        glCheckError();

        return;
    }

    {
        //GLProtectAttrib a(GL_TRANSFORM_BIT); // GL_MODELVIEW is active by default

        // Note: the OFX spec says that the GL_MODELVIEW should be the identity matrix
        // http://openfx.sourceforge.net/Documentation/1.3/ofxProgrammingReference.html#ImageEffectOverlays
        // However,
        // - Nuke uses a different matrix (RoD.width is the width of the RoD of the displayed image)
        // - Nuke transforms the interacts using the modelview if there are Transform nodes between the viewer and the interact.


        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(zoomLeft, zoomRight, zoomBottom, zoomTop, -1, 1);
        _imp->glShadow.setX( (zoomRight - zoomLeft) / width() );
        _imp->glShadow.setY( (zoomTop - zoomBottom) / height() );
        //glScalef(RoD.width, RoD.width, 1.0); // for compatibility with Nuke
        //glTranslatef(1, 1, 0);     // for compatibility with Nuke
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        //glTranslatef(-1, -1, 0);        // for compatibility with Nuke