I'm making the change I mentioned earlier to the way screens / contexts / drawables are created by the driver. In doing so I came across some very curious code in driCreateContext (in lib/GL/dri/dri_util.c). Early in the function there is an if-statement that begins 'if (!psp->dummyContextPriv.driScreenPriv) {'. In the if-statment driScreenPriv is set to a non-NULL value. Then, a little later in the function, an almost identical if-statement appears.
The only "magic" that happens is a call to XF86DRICreateContext inbetween. At least on the r200 driver, I could not get the second if-statement to ever evaluate to true. Is it even needed? Looking at the CVS log, the code has been this way since this file was created. It looks like this file was moved from somewhere else in the mesa-3-5-branch.
It's not clear how it could change... The file was previously in I think lib/GL/mesa/dri.
Keith
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