[Xquartz-dev] Tiger: OpenGL problem with stereo visuals with AppleSGLX-55

[Martin Otte]

LIBGL_FORCE_SOFTWARE didn't seem to do anything, but grepping in the  
source code it looks like there is a LIBGL_ALWAYS_SOFTWARE which I  
tried. Unfortunately, I get the same result on Tiger:

 > env LIBGL_DIAGNOSTIC=1 LIBGL_ALWAYS_SOFTWARE=1  
LIBGL_DUMP_VISUALID=1 glxgears -stereo
initializing libGL in apple_init_glx
DIAG: CGL major 1 minor 0
visualid 0x1b2
DIAG: Software rendering requested.  Using kCGLRendererGenericFloatID.
error: invalid pixel format
X Error of failed request:  GLXBadContext
   Major opcode of failed request:  0 ()
   Serial number of failed request:  22
   Current serial number in output stream:  22

glxinfo shows the information for visual id 1b2 as:

Visual ID: 1b2  depth=24  class=TrueColor
     bufferSize=32 level=0 renderType=rgba doubleBuffer=1 stereo=1
     rgba: redSize=8 greenSize=8 blueSize=8 alphaSize=8
     auxBuffers=0 depthSize=32 stencilSize=0
     accum: redSize=8 greenSize=8 blueSize=8 alphaSize=8
     multiSample=0  multiSampleBuffers=0
     visualCaveat=None

I don't need stereo visuals, but the software that I use checks if  
stereo visuals are available and if so opens a stereo opengl context,  
at which point it stops just like the glxgears -stereo example.

Thanks,
Martin



On Mar 25, 2009, at 5:58 PM, Jeremy Huddleston wrote:

> Try LIBGL_FORCE_SOFTWARE=1 instead of ALLOW
>
> On Mar 25, 2009, at 11:22, Martin Otte wrote:
>
>> Hi,
>>
>> With LIBGL_ALLOW_SOFTWARE=1, I still get:
>>
>> > env LIBGL_ALLOW_SOFTWARE=1 LIBGL_DIAGNOSTIC=1 glxgears -stereo
>> initializing libGL in apple_init_glx
>> DIAG: CGL major 1 minor 0
>> DIAG: Software rendering is not being excluded.  Not using  
>> kCGLPFAAccelerated.
>> error: invalid pixel format
>> X Error of failed request:  GLXBadContext
>>  Major opcode of failed request:  0 ()
>>  Serial number of failed request:  22
>>  Current serial number in output stream:  22
>>
>>
>> Martin
>>
>>
>> On Mar 25, 2009, at 1:16 PM, George Peter Staplin wrote:
>>
>>> Quoted Martin Otte <otte at duke.edu>:
>>>
>>>> Using AppleSGLX-55 and xorg-server-1.4.2-apple37 from macports,  
>>>> I can
>>>> now compile a working X-server with accelerated OpenGL on Tiger.
>>>>
>>>> The only difference I noted compared to the system X11 is that   
>>>> a glx
>>>> program which tries to use  a stereo visual crashes. I can  
>>>> replicate
>>>> the same crash with glxgears -stereo:
>>>>
>>>>> env LIBGL_DIAGNOSTIC=1 glxgears -stereo
>>>> initializing libGL in apple_init_glx
>>>> DIAG: CGL major 1 minor 0
>>>> error: invalid pixel format
>>>> X Error of failed request:  GLXBadContext
>>>>  Major opcode of failed request:  0 ()
>>>>  Serial number of failed request:  22
>>>>  Current serial number in output stream:  22
>>>>
>>>> So far, this is the only problem that I have experienced with
>>>> xorg-server-1.4.2-apple37 on Tiger.
>>>>
>>>> Thanks for the Tiger support,
>>>> Martin
>>>
>>> Can you try adding: LIBGL_ALLOW_SOFTWARE=1 ?  I'm not sure if 55  
>>> had that though.  That could allow the stereo pixel format to  
>>> work.  It could also be that a shared context is involved.  There  
>>> are some restrictions with shared contexts that CGL adds, that  
>>> X11 implementations usually don't.
>>>
>>> As I understand it, some changes that Jeremy made to force  
>>> accelerated renderers by default in AppleSGLX also made more  
>>> shared contexts work.
>>>
>>>
>>> George
>>> -- 
>>> http://people.freedesktop.org/~gstaplin/
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>>> Xquartz-dev mailing list
>>> Xquartz-dev at lists.macosforge.org
>>> http://lists.macosforge.org/mailman/listinfo.cgi/xquartz-dev
>>
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