Re: [Plib-devel] commandline conversion program

[<br...@sa...>]

> You need to understand how non-visible OpenGL rendering contexts
> work.

Ok, pbuffers it will be....

They prove to be a real pain.
On IRIX, glXGetFBConfigs() returns 43 configs.
On linux, it returns 0.

My glx implementation is a modern one (1.3), and according
to IBM's developer info, glXGetFBConfigs() or glxChooseFBConfig()
should work with glx1.3:
http://publib.boulder.ibm.com/infocenter/pseries/index.jsp?topic=/com.ibm.aix.doc/libs/openglrf/HowRenderXdraw.htm

My glxinfo on linux gives me:

server glx vendor string: NVIDIA Corporation
server glx version string: 1.3
server glx extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
    GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
    GLX_ARB_multisample
client glx vendor string: NVIDIA Corporation
client glx version string: 1.3
client glx extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_visual_info,
    GLX_EXT_visual_rating, GLX_EXT_import_context, GLX_SGI_video_sync,
    GLX_NV_swap_group, GLX_NV_video_out, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
    GLX_SGI_swap_control, GLX_NV_float_buffer
GLX extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
    GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
    GLX_ARB_multisample, GLX_ARB_get_proc_address

Any idea why configs are not found? glxinfo -t lists a lot of
configs.

My tst prog:

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <GL/glx.h>


int main(int argc, char *argv[])
{
  Display *dpy = XOpenDisplay(0);
  int scn=DefaultScreen(dpy);
  int cnt;
  GLXFBConfig *cfg = glXGetFBConfigs(dpy, scn, &cnt);
  fprintf(stderr,"glXGetFBConfigs returned %p (%d matches)\n", cfg, cnt);
  assert(cnt);
  int attrlist[] =
  {
    GLX_PBUFFER_WIDTH, 1,
    GLX_PBUFFER_HEIGHT, 1,
    0
  };
  GLXPbufferSGIX pBuffer = glXCreatePbuffer(dpy, cfg[0], attrlist);
  fprintf(stderr,"pBuffer = %p\n", pBuffer);
}