[Mesa-dev] glReadPixels broken w/ latest MapRenderbuffer changes

[Brian Paul]

The pure, non-DRI swrast driver dies in all glReadPixels calls when 
reading from the front/back color buffers.  So basically all piglit 
tests fail.

I think that the problem is there is no rb->Data for these surfaces; 
they're XImages/Pixmaps.  The xlib driver needs to have 
Map/UnmapRenderbuffer functions that can access the pixels in the 
XImage/Pixmaps.

Sorry I didn't spot that before you pushed the series, Eric.

I may not be able to dig into this until later, or the weekend.

-Brian