Hello Carlos,
This is a serious challenge. Could we set up something like a stack of
texture buffers with OpenGL so that cairo would render to one of them and
then we could do something to blend them correctly into the screen?
In OpenGL exists this:
http://www.opengl.org/wiki/Buffer_Texture
But I don't know how is the support in Cairo for such things.
Best regards,
Diego.
2012/12/10 Konstantin Dmitriev <[email protected]>
> 2012/12/10 Carlos López González <[email protected]>:
> > 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...
> > ^__^
>
>
> Maybe there is some widget similar to one that Qt have? -
> http://doc.qt.digia.com/qt/qglwidget.html#details
> I don't know if such one exists for gtk...
>
> BTW, maybe it worth to look how rendering implemented in Uioimae's branch?
> K.
>
>
>
> --
> http://morevnaproject.org/
>
>
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