From: Bram Stolk (bram++at++sara.nl)
Date: 02/16/2005 04:00:20
Benedikt Kessler wrote:
> Hi!
>
> If you are able to compile and use programs that make use of the GLX 1.3 call glXCreatePbuffer(), then you should replace the extension call glXMakeCurrentReadSGI (and maybe others) by glXMakeContextCurrent.
>
> The glX calls are usually defined in libGL.so
Benedikt, thanks!
There is indeed an alternative piece of code for the case that
#ifdef GLX_SGI_make_current_read evaluates as false.
If I force this to false, I can build and run it.
I want to use this to render images *much* larger than my screenspace.
Although this works pretty well, I see unexpected performance behaviour:
on my 1280x1024 deskop, 1600x1600 pbuffer sizes perform satisfactory,
like 10 fps or so. 2000x2000 performance drops drastically to 0.3 fps
or so. Maybe I'm running out of graphics memory or something. I'll see if
I can find out if there are hard-limits for pbuffers.
Thanks again,
Bram
PS: Ofcourse the pbuffer sample has an overhead by doing a writepixels
on a visible window. Without this 2nd context, maybe performance will not
drop at 2Kx2K. I'm aiming for a 7000x5000 resolution :-)
> Bye! Benedikt
>
>
> Bram Stolk wrote:
>
>>Hello,
>>
>>I'm trying to build /usr/share/Performer/src/pguide/libpf/C/pbuffer.c
>>
>>Reading this old posting:
>>http://oss.sgi.com/projects/performer/mail/info-performer/perf-03-08/0087.html
>>I see that Alexandre could build it.
>>
>>I'm on pf3.2 linux, and the pbuffer is not a target in the GNUMakefile.
>>If I add pbuffer as a target, and build it, I get:
>>
>>make[2]: Entering directory `/usr/share/Performer/src/pguide/libpf/C/OPT.I386'
>>cc -O3 -ffast-math -mcpu=pentiumpro -MD -fPIC -DI386 -DLinux -I..
>>-I/usr/include -I/usr/X11R6/include -o pbuffer.dsocmd pbuffer.o -L/usr/lib
>>-L/usr/lib/libpfdb -L/lib -lpfv -lpfdu -lpfutil -lpfdu -lpfui -lpf
>>-L/usr/X11R6/lib -lGLU -lGL -lXext -lpthread -lGLw -lXm -lXt -lXp -lXpm -lXmu
>>-lX11 -lm -ldl
>>pbuffer.o(.text+0x96e): In function `DrawCopy':
>>: undefined reference to `glXMakeCurrentReadSGI'
>>collect2: ld returned 1 exit status
>>make[2]: *** [pbuffer.dsocmd] Error 1
>>
>>In which library does this symbol normally reside?
>>
>>I can build programs that use glXCreatePbuffer() without problems, so I know
>>that my NVIDIA 66.29 system is capable of pbuffers.
>>
>>Thanks!
>>
>> Bram
>>
>>-----------------------------------------------------------------------
>> List Archives, Info, FAQ: http://www.sgi.com/software/performer/
>> Open Development Project: http://oss.sgi.com/projects/performer/
>> Submissions: info-performer++at++sgi.com
>> Admin. requests: info-performer-request++at++sgi.com
>>-----------------------------------------------------------------------
>
>
This archive was generated by hypermail 2b29 : Wed Feb 16 2005 - 04:00:36 PST