> I've got things mostly working again as of 62710. The embedded
> framebuffer doesn't want to linger in MGED, which IIRC is a problem
> you experienced earlier and found a workaround for, but looking at how
> it's working (or not working) both pre and post refactor I think we
> may want to reconsider how that's being handled anyway. At least
> here, the overlay/underlay mechanism for the embedded framebuffer only
> worked after the raytrace was complete, not during the raytrace -
> that's not consistent with the other dm implementations.
>
I know this happens but I couldn't find a better solution.
>
> Could we improve the overall behavior generally by doing 2 things:
>
> 1. Add a libdm level function mechanism to show/hide the framebuffer
> in the display manager - since the dm is providing a built-in
> framebuffer now, I think it makes sense to push the management logic
> for that out of MGED and further down. For Qt, it also lets us do
> whatever makes sense without involving MGED.
>
>
This could be done quite easy.
> 2. At the Qt level, have two drawing images or "layers" - one for the
> display manager wireframes (and eventually polygons) and the other for
> the framebuffer image. Based on the visibility settings, those two
> images would be composited (or not, as the case may be) in the
> appropriate fashion into a final, "rendered" image which is what would
> be presented to the application. That way, whatever is needed to do
> the "update raytrace as it happens but stay in underlay at the same
> time" process in Qt can be done behind the scenes and all MGED has to
> do is provide the appropriate number to dm_set_fb_visible.
>
> At the moment there already are two images: a QImage used for the
framebuffer image and a QPixmap for display manager wireframes. The
disappearing problem is related to the fact that after the raytracing is
complete, the whole scene is redrawn so in order to show it, I set the
QImage as the background and then all the drawing is done over the window
(for the underlay). In order to have an underlay drawing during raytracing,
I don't know exactly which is the best way to combine the images, because
we need a fast way to extract objects from one image and insert them into
the other. One idea would be to store some sort of objects, not a whole
image so that they could be combined more easily. What do you think?
Cheers,
Vlad
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