[Mesa-dev] Check OpenGL and OpenGL ES2.0 renderer info in one process

[Chia-I Wu]

On Fri, Dec 10, 2010 at 10:55 AM, Jammy Zhou <jammy.zhou at linaro.org> wrote:
> 2010/12/9 Chia-I Wu <olvaffe at gmail.com>
>> 2010/12/9 Kristian Høgsberg <krh at bitplanet.net>:
>> > 2010/12/9 Jammy Zhou <jammy.zhou at linaro.org>:
>> >> Hi All,
>> >>
>> >> Currently I am doing some experiments with mesa 7.9 driver to check the
>> >> renderer info of underlying OpenGL and OpenGL ES2.0 drivers to decide
>> >> which
>> >> driver to use at runtime. With my code attached, the renderer info for
>> >> GLES2
>> >> can be got successfully, and although the EGL and GLES2 libraries are
>> >> unloaded before creating the GLX context, glGetString(GL_RENDERER) for
>> >> OpenGL still returns NULL. After enable MESA_DEBUG, I found the error
>> >> message "GL User Error: calling GL function without a rendering
>> >> context",
>> >> and many warnings as "Mesa warning: failed to remap ....".  I also
>> >> changed
>> >> the sequence for GL and GLES2, but got similar results. If do
>> >> separately,
>> >> both renderer info can be got successfully. It seems that EGL/GLES2 and
>> >> GLX/GL affects each other in this case, may be related to library
>> >> load/unload(?). Do you guys have some ideas to solve this problem?
>> >
>> > Yes, this is a limitation in the way the dri driver implements
>> > different APIs.  We have a few global tables that get initialized with
>> > API specific data, so if you switch to a different GL API later, it
>> > will give you the remapping errors you saw.
>> > It would be nice to fix, but I don't know that anybody is looking into
>> > it.
>> 16ee7a55ae269612263468195f2af998cb9ef695 should solve the remapping
>> errors.  It allows contexts of different client APIs to coexist.  But
>> yes, there are still some global tables (e.g. glGet* table) that are
>> not multiple-API aware.  There are also places that API check is done
>> at compile time...
> I just tried latest mesa with 16ee7a55ae269612263468195f2af9
> 98cb9ef695 you mentioned, but the remapping errors are still there.
Do you have a test case for that?
>>
>> > Kristian
>> > _______________________________________________
>> > mesa-dev mailing list
>> > mesa-dev at lists.freedesktop.org
>> > http://lists.freedesktop.org/mailman/listinfo/mesa-dev
>> >
>>
>>
>>
>> --
>> olv at LunarG.com
>
>



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