Hi Scott,

On Oct 25, 2007, at 4:09 AM, [EMAIL PROTECTED] wrote:
I have openchrome drivers installed for my CN700 Unichrome Pro
graphics card ( http://www.via.com.tw/en/products/chipsets/c-series/
cn700/ ) . It increased the glxgears output from 180fps with vesa
to around 600fps but has not allowed me  to access the opengl
pipeline.


[snip]

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_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_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

Could you tell me whether this card could be suitable. From reading
the specs I really thought It would be sufficient.


As documented at [1], the OpenGL-based pipeline requires GLX 1.3
support (mainly for access to hardware accelerated pbuffers), but the
openchrome driver only seems to support GLX 1.2, according to the
version string above and the lack of GLX_SGIX_pbuffer in the server
side GLX extension list above.  Even if we could work around this
limitation, since it supports neither pbuffers or the
GL_EXT_framebuffer_object extension in hardware, you would find that
the OpenGL-based pipeline would not provide much performance
improvement (and maybe a loss) for your application.

There is also a driver produced by via. The linux community hsa
reported much better success with the openchrome driver however.
Could using the VIA driver have a different result?


You could give it a try; I don't know for sure.  Please report any
findings back to this list if you do try.

[1] http://java.sun.com/j2se/1.5.0/docs/guide/2d/new_features.html#ogl

Thanks,
Chris

Thanks in advance.

Scott
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