interpreting glxinfo's output

[Dan B. Phung]

the bottom of this thread has your answer...though this is from Dec 
2006, so somebody else might have updated information.

http://forum.compiz-fusion.org/archive/index.php/t-87.html



andrew rader wrote:
> Hi all,
>
> I've been toying with the idea of creating a small compositing window
> manager for a while, and I've started looking at the sourcecode of
> compiz, xcompmgr, etc and I have a quick question. I'm currently using
> a laptop with the intel gm965 chipset (aka X3100) and I've been
> bothered by the output of glxinfo regarding the texture_from_pixmap
> extension.
>
> My app is using the glXQueryExtensionsString function to check for the
> existence of the GLX_EXT_texture_from_pixmap extension, without
> success. The output of this function is the following string:
>
> "GLX_ARB_get_proc_address GLX_ARB_multisample GLX_EXT_import_context
> GLX_EXT_visual_info GLX_EXT_visual_rating GLX_MESA_copy_sub_buffer
> GLX_MESA_swap_control GLX_MESA_swap_frame_usage GLX_OML_swap_method
> GLX_SGI_make_current_read GLX_SGI_swap_control GLX_SGI_video_sync
> GLX_SGIS_multisample GLX_SGIX_fbconfig GLX_SGIX_visual_select_group "
>
> The above clearly does not contain the texture_from_pixmap extension,
> but when I run glxinfo I get the following (snipped for brevity):
>
> name of display: :0.0
> display: :0  screen: 0
> direct rendering: Yes
> server glx vendor string: SGI
> server glx version string: 1.2
> server glx extensions:
>    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap,
>    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer,
>    GLX_OML_swap_method, GLX_SGI_make_current_read, GLX_SGI_swap_control,
>    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
> client glx vendor string: SGI
> client glx version string: 1.4
> client glx extensions:
>    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
>    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_allocate_memory,
>    GLX_MESA_copy_sub_buffer, GLX_MESA_swap_control,
>    GLX_MESA_swap_frame_usage, GLX_OML_swap_method, GLX_OML_sync_control,
>    GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGI_video_sync,
>    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
>    GLX_SGIX_visual_select_group, GLX_EXT_texture_from_pixmap
> GLX version: 1.2
> GLX extensions:
>    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
>    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer,
>    GLX_MESA_swap_control, GLX_MESA_swap_frame_usage, GLX_OML_swap_method,
>    GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGI_video_sync,
>    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
> OpenGL vendor string: Tungsten Graphics, Inc
> OpenGL renderer string: Mesa DRI Intel(R) 965GM 4.1.3002
> OpenGL version string: 1.4 Mesa 7.0.2
> OpenGL extensions: <snip>
>
> So my question: what is the difference between "server glx
> extensions", "client glx extensions", and "GLX extensions"? It appears
> the the first two list "GLX_EXT_texture_from_pixmap" as supported, but
> the "GLX extensions" list does not.
>
> Is this a configuration issue? a driver issue? any ideas would be appreciated
>
> -Andy
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