1. Enable GLX_SGI_make_current_read support in all drivers. The MGA driver already supports this extension. I did a patch once, which I'll have to find, that enabled it for r200, but the patch only worked with pageflipping disabled. People can start working on this now, if they like. :)
Here's my old SGI_make_current_read patch for r200. IIRC, it only works when pageflipping is disabled. I suspect the problem is related to the pointer to the front / back buffer not being tracked correctly as the current page changes. It shouldn't be too tough to get it working, but I'm not going to have a chance to get to it anytime soon.
The last time I worked on it, as evident by the date in the patch, is 23-Nov-2003. This was *before* the drivers moved to the Mesa tree, so it may be a little painful to apply the patch. Sorry.
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