You can work around the issue using ScreenIdentifier::readDISPLAY() and passing
that ScreenIdentifier to WindowingSystemInterface::getNumScreens()
Code:
osg::GraphicsContext::ScreenIdentifier si;
si.readDISPLAY();
windowingSystemInterface->getNumScreens(si);
I wonder if OSG should read the display by default in the ScreenIdentifier()
constructor?
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=65785#65785
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