Workaround flipped cursor on OS X

components/sdlutil/sdlcursormanager.cpp

@@ -126,7 +126,13 @@ namespace
 
         glViewport(0, 0, width, height);
 
+#if defined(__APPLE__)
+        // FIXME: why are the extra flips needed on Mac? glReadPixels bug?
+        osg::ref_ptr<osg::Geometry> geom = osg::createTexturedQuadGeometry(osg::Vec3(-1,1,0), osg::Vec3(2,0,0), osg::Vec3(0,-2,0));
+#else
         osg::ref_ptr<osg::Geometry> geom = osg::createTexturedQuadGeometry(osg::Vec3(-1,-1,0), osg::Vec3(2,0,0), osg::Vec3(0,2,0));
+#endif
+
         geom->drawImplementation(renderInfo);
 
         glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, resultImage->data());