void StWindow::stglDraw() {
if(myWin->myGlContext.isNull()) {
return;
}
const StGLBoxPx aVPMaster = StWindow::stglViewport(ST_WIN_MASTER);
const GLsizei aHeight = (aVPMaster .height() == 0) ? 1 : aVPMaster .height();
const StGLBoxPx aRect = {{ aVPMaster.x(), aVPMaster.y(), aVPMaster.width(), aHeight }};
myWin->myGlContext->stglResizeViewport(aRect);
signals.onRedraw(ST_DRAW_LEFT);
stglSwap(ST_WIN_ALL);
}
void StGLRootWidget::stglScissorRect(const StRectI_t& theRect,
StGLBoxPx& theScissorRect) const {
const GLint aVPortWidth = myViewport[2];
const GLint aVPortHeight = myViewport[3];
const GLint aRootWidth = getRectPx().width();
const GLint aRootHeight = getRectPx().height();
if(aRootWidth <= 0 || aRootHeight <= 0) {
// just prevent division by zero - should never happen
stMemZero(&theScissorRect, sizeof(StGLBoxPx));
return;
}
// viewport could have different size in case of rendering to FBO
const GLdouble aWidthFactor = GLdouble(aVPortWidth) / GLdouble(aRootWidth);
const GLdouble aHeightFactor = GLdouble(aVPortHeight) / GLdouble(aRootHeight);
theScissorRect.x() = myViewport[0] + GLint(aWidthFactor * GLdouble(theRect.left())) + myScrDispXPx;
theScissorRect.y() = myViewport[1] + GLint(aHeightFactor * GLdouble(aRootHeight - theRect.bottom()));
theScissorRect.width() = GLint(aWidthFactor * GLdouble(theRect.width()));
theScissorRect.height() = GLint(aHeightFactor * GLdouble(theRect.height()));
}
