mesa3d-users

Re: [Mesa3d-users] Incorrect Coloring of 3D with Mesa

[tom f. <tf...@al...>]

rnddim <rn...@gm...> writes:
> Ever since putting Linux on this machine, the colors in any 3D
> application has been very wrong. The entire spectrum is off (i.e.
> you know it's supposed to be red, but it doesn't look like it) in
> addition to a blue "tint" over everything. The picture attached shows
> off the classic 'gears' program, which illustrates the problem.
>
> The video driver I have is an ATI Rage Mobility 128 (r128), and I run
> a machine using the PPC G3 processor (old laptop, I know, but it was
> free). I can rule out the hardware because when Mac OS X was on the
> machine, there were no problems with OpenGL.

The image looks slightly different, but maybe you're hitting bug 22017:

  https://bugs.freedesktop.org/show_bug.cgi?id=22017

?

I have only quickly glanced through that bug, I could be completely
off.

If that issue differs from yours, I would recommend 1) doing a more
thorough search than I have for this in the bug DB, and if not found,
2) file a new bug report.

Cheers,

-tom

Re: [Mesa3d-users] Incorrect Coloring of 3D with Mesa

[rnddim <rn...@gm...>]

That bug sounds about right. But of course, it's unresolved. :(

I suppose what makes me the maddest is that I can't find out where the 
bug occurs. I'm hoping there's a line of code or two I can change in my 
personal copy of Mesa to help counteract the problem, if it's a problem 
with something beyond Mesa (which it seems like it is).

Comparing my gears picture and the one on the Mesa3d homepage (which I'm 
assuming is a snapshot of the correct gears output), this is what 
happens (good output on mesa3d.org, bad output in my original attachment):

Good Output -> Bad Output
Red Gear -> Green Gear (the one that may look cyan or light blue to some 
in the picture)
Green Gear -> Red Gear (may look pink)
Blue Gear -> Alpha (transparent) Gear (it looks like a light gray-blue 
gear, but that's transparency at work)
Alpha (No) Background (appears black) -> Blue Background

Based on this, it's mostly likely that any RGBA color value is read as 
GRAB. I wonder if there's anywhere in the Mesa source code, probably 
where colors are first read, where I could insert an 'easy fix'.

Re: [Mesa3d-users] Incorrect Coloring of 3D with Mesa

[Brian P. <br...@vm...>]

rnddim wrote:
> That bug sounds about right. But of course, it's unresolved. :(
> 
> I suppose what makes me the maddest is that I can't find out where the 
> bug occurs. I'm hoping there's a line of code or two I can change in my 
> personal copy of Mesa to help counteract the problem, if it's a problem 
> with something beyond Mesa (which it seems like it is).
> 
> Comparing my gears picture and the one on the Mesa3d homepage (which I'm 
> assuming is a snapshot of the correct gears output), this is what 
> happens (good output on mesa3d.org, bad output in my original attachment):
> 
> Good Output -> Bad Output
> Red Gear -> Green Gear (the one that may look cyan or light blue to some 
> in the picture)
> Green Gear -> Red Gear (may look pink)
> Blue Gear -> Alpha (transparent) Gear (it looks like a light gray-blue 
> gear, but that's transparency at work)
> Alpha (No) Background (appears black) -> Blue Background
> 
> Based on this, it's mostly likely that any RGBA color value is read as 
> GRAB. I wonder if there's anywhere in the Mesa source code, probably 
> where colors are first read, where I could insert an 'easy fix'.

Possibly.  Look through src/mesa/drivers/dri/r128/* for instances of 
MESA_FORMAT_*.

Perhaps MESA_FORMAT_ARGB8888 should be PIPE_FORMAT_ARGB8888_REV, or 
something like that.  See src/mesa/main/formats.h for the available 
pixel formats.

I doubt that any of the active DRI developers have R128 hardware on 
hand so hopefully you can figure it out.

BTW, you should use Mesa 7.7 if you aren't already.

-Brian

Re: [Mesa3d-users] Incorrect Coloring of 3D with Mesa

[rnddim <rn...@gm...>]

Thank you. I will try playing with MESA_FORMAT and all that, and let you 
know what occurs. (I assume the REV in PIPE_FORMAT_ARGB8888_REV stands 
for REVerse)

The source I just compiled is from the git repository. glinfo (in the 
progs/demos folder) said I'm running 7.7-devel.

Re: [Mesa3d-users] Incorrect Coloring of 3D with Mesa

[rnddim <rn...@gm...>]

update: darn, gears still blue :( . Apparently, replacing 
MESA_FORMAT_ARGB8888 with MESA_FORMAT_ARGB8888_REV in every r128 driver 
source file didn't work (I'll try and see if I need to reboot for 
changes to take place later).

If I went the wrong way there, then please let me know what to do! I 
don't a lot of C++ (I know a little, but my preferred language is 
Python), let alone the Mesa code!