Color Depths
Ben Gamari
ben at mw0.ath.cx
Mon Nov 19 21:31:24 PST 2007
Hey all,
In continuing my journey into the X server and supporting components,
I've found a great number of references to color depths of various
types. It seems that the problem I am presently encountering is that
FBConfigs of the correct color depth (24 bits) are not being created.
Presently, all 36 GLXFBConfigs created have a size of 32, e.g.
36 GLXFBConfigs:
Vis Vis Visual Trans buff lev render DB ste r g b a aux dep ste accum buffers MS MS
ID Depth Type parent size el type reo sz sz sz sz buf th ncl r g b a num bufs
----------------------------------------------------------------------------------------------------
0x57 0 TrueColor 0 32 0 rgba 0 0 8 8 8 8 0 0 0 0 0 0 0 0 0
...
However, the i830 driver only allows Xorg to start when the default
color depth is 24. If I override the default color depth to 32 in compiz
(by adding a "defaultDepth = 32;" line right before the FBConfig check,
approximately line 2170) compiz starts fine but is unable to map any of
my windows to textures because they use 24 bit visuals.
If I add 32 to the depth whitelist in xf86-video-intel (just for shits
and giggles), the server comes back with a complain about inconsistent
weights. All in all, the entire thing is quite perplexing, especially
considering not so long ago things worked generally as they should.
I can only conclude that something has a depth wrong. Are my
GLXFBConfigs supposed to be 24 bits if my default depth is 24 bits?
Should my windows by using 32-bit visuals? Under what types of "depths"
take into account the alpha channel? There seems to be great
inconsistency in convention here.
Thanks again for your time,
- Ben
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