bool QGLContext::chooseContext(const QGLContext* shareContext)
{
Q_D(QGLContext);
if(!d->paintDevice || d->paintDevice->devType() != QInternal::Widget) {
d->valid = false;
}else {
QWidget *widget = static_cast<QWidget *>(d->paintDevice);
if (!widget->platformWindow()){
QGLFormat glformat = format();
QPlatformWindowFormat winFormat = QGLFormat::toPlatformWindowFormat(glformat);
if (shareContext) {
winFormat.setSharedContext(shareContext->d_func()->platformContext);
}
if (widget->testAttribute(Qt::WA_TranslucentBackground))
winFormat.setAlpha(true);
winFormat.setWindowApi(QPlatformWindowFormat::OpenGL);
winFormat.setWindowSurface(false);
widget->setPlatformWindowFormat(winFormat);
widget->winId();//make window
}
d->platformContext = widget->platformWindow()->glContext();
Q_ASSERT(d->platformContext);
d->glFormat = QGLFormat::fromPlatformWindowFormat(d->platformContext->platformWindowFormat());
d->valid =(bool) d->platformContext;
if (d->valid) {
d->platformContext->setQGLContextHandle(this,qDeleteQGLContext);
}
d->setupSharing();
}
return d->valid;
}
QGLTemporaryContext::QGLTemporaryContext(bool, QWidget *)
: d(new QGLTemporaryContextPrivate)
{
d->context = const_cast<QPlatformGLContext *>(QPlatformGLContext::currentContext());
if (d->context)
d->context->doneCurrent();
d->widget = new QWidget;
d->widget->setGeometry(0,0,3,3);
QPlatformWindowFormat format = d->widget->platformWindowFormat();
format.setWindowApi(QPlatformWindowFormat::OpenGL);
format.setWindowSurface(false);
d->widget->setPlatformWindowFormat(format);
d->widget->winId();
d->widget->platformWindow()->glContext()->makeCurrent();
}