[Mesa-dev] Correct behaviour of glDrawPixels and glBitmap when texturing is enabled.

[Matthew Dawson]

On March 23, 2015 10:21:32 AM Brian Paul wrote:
> On 03/22/2015 05:50 PM, Matthew Dawson wrote:
> > If it isn't fully realized, is it worth it to test/implement this
> > section, since its removed in the core profile?  Would a reduced
> > implementation to fix this test be OK (ignoring things like passing it
> > through the vertex shader)?
> 
> If this is all about fixing the piglit draw-pixel-with-texture test, I'm
> not sure it's worthwhile.  As I said, it's a "feature" that few people
> care about.
> 
> There definitely are apps out there that use glDrawPixels() (a fair
> number of CAD apps) but luckily they don't depend on glDrawPixels with
> some strange application of texture or fog.
I understand that this corner of mesa isn't considered high priority, as 
everyone has rightfully pointed out, as no one would really be interested in 
using this work.  As such, I won't bother trying to improve this corner case 
further then necessary.

That being said, if I can finish this up without causing large changes in the 
code, could I get this committed?  If nothing else, I've used this to learn 
more about mesa (and it has been quite educational for me, since I haven't 
looked at mesa's internals before now) and it would be nice to close this 
issue.  I almost have a complete solution ready to go (thanks for the pointers 
on the raster position, that was the last needed piece!), and I think I can 
get the initial version posted from here without help.

Moving forward, I'd like to work on making piglit pass on my hardware 
(basically r600/radeonsi right now) for the non-skipped tests.  Would that be 
ok to push forward within mesa, even it touches similar obscure "features"?  
Or would it be preferred to simply remove those tests from piglit, since the 
features under test are not wanted?
-- 
Matthew
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