Hi Konstantin,
I think that use a cairo_gl_surface is exactly the same than write directly
to the screen.
If you read the code to create a cairo_gl_surface in the link from the
stackoverflow thread (I've read that thread thousands times!), it creates
the surface based on the device and it is created based on the display and
the context (glX context) so I think it is for direct draw on the screen.
dpy = XOpenDisplay (NULL);
visinfo = glXChooseVisual (dpy, DefaultScreen (dpy), rgba_attribs);
ctx = glXCreateContext (dpy, visinfo, NULL, True);
device = cairo_glx_device_create (dpy, ctx);
surface = cairo_gl_surface_create (device, CAIRO_CONTENT_COLOR_ALPHA,
size, size);
In any case, use a cairo_gl_surface doesn't solve the synchronization
problems.
How do we assure that each renderer doesn't remove the results of the other
renderers if they aren't in synchronization?
I'm lack of knowledge about how the opengl programs work but I guess that
somehow there should be a buffer that would act like if it were the screen
(and where the GPU draws to) that is transferred to the screen synchronized
with the device refreshing to avoid jitter.
I'm sorry but my mind is about to explode...
^__^
2012/12/10 Konstantin Dmitriev <[email protected]>
>
> Hi, Carlos!
> Maybe my question is silly, but why you want to draw directly on the
> screen? Are there any chance to draw on cairo-gl surface?
>
> http://stackoverflow.com/questions/6105948/how-to-create-a-cairo-gl-surface-under-gtk
> K.
>
>
>
> --
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--
Carlos
http://synfig.org
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