Blerg. Never mind. I can reproduce the issue quite readily with VirtualGL 2.3.1. I wasn't able to reproduce it with the current SVN trunk because a fix I just checked in for another problem fixed this as well.
Basically, VirtualGL's readback function was trying to share the OpenGL context established by the app, which meant that it had to try and store/restore all of the various OpenGL parameters that might affect pixel readback (of which there are quite a few.) Rather than keep playing this game of whack-a-mole, I modified the readback function so that a temporary GLX context is created just to perform the readback. Since the context is created with a compatibility profile (by calling glXCreateNewContext()), the extension in question is reported in GL_EXTENSIONS, and everything works properly. I can't think of any downside to this approach, but if others have feedback on it, let me know. On 8/22/12 7:24 PM, Antony Riakiotakis wrote: > Hi, > > When creating a core OpenGL 3.x+ profile using bumblebee, the new > context fails when passing > through server/pdrawable.cpp line 264. The check fails on a core profile > 3.x+ context because the extension does not exist for such profiles (It > is considered core functionality, not an extension). At least NVIDIA > drivers do not advertise this as an extension. You should consider this > extension as supported on OpenGL contexts with version > 3.0. In fact, > for such contexts using glGetString(GL_EXTENSIONS) to check for > extensions is considered an error. You should use glGetStringi instead. > > Thanks, > > Antony Riakiotakis ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ VirtualGL-Devel mailing list VirtualGL-Devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtualgl-devel
