[Dri-devel] Confusion about some code in driCreateContext

[Ian Romanick]

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.



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