There has been some reports on R and B colours getting
mixed in glDrawPixels/glReadPixels on win32/glide based
Mesa. (In my case with V2, which might be significant
also)
I am now seeing this bug "reliably" on my application:
-when doing glReadPixels the R and B channel
datas are swapped.
-the bug seems to "get started" when I do a
glDrawPixels operation.
-after the pixels start reading in swapped fashion
they stay like that.
I searched around in Mesa sources but could not find an
obvious reason for this. I currently suspect that
it is Glide which is somehow losing its "state".
In Glide2 (at least) I did not find a way to directly
set the RGB/BGR state (or to inquire it) so I couldn't
do any tricks with the state directly. It seems possible
that using the FXMESA_USE_ARGB might avoid the problem,
but I have not tried this yet. (I will check this after
I get the CVS working for me, and have updated my sources)
I currently avoid the problem by coloring a corner
of the screen red and reading those pixels back.
If they are blue, I swap the R and B on my real readpixels
(what an ugly (butworking) hack)
Eero
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