Hi,
First I want to thanks for the help on my last message, unfortunately
it didn't solved my problem completely.
When subclassing ClutterGroup and enabling the depth test I got a
flickering which will reveal both sides of the card during the
animation (tested on i915 and NV34).
So I tried to use the other solution, hiding and showing the actors as
the card rotates, but angle when the back becomes visible varies with
the card position, there is no way to know when it will be visible or
not.
Does anyone know any other idea to solve this issue? I'm thinking
about changing the backend, but performance is a need here.
Pedro Casagrande de Campos
2008/2/15, Matthew Allum <[EMAIL PROTECTED]>:
> Hi;
>
>
> On Fri, 2008-02-15 at 13:37 -0200, Pedro Campos wrote:
> > Hi,
> >
> >
> > I'm developing an application that must rotate a card showing its
> > front and its back.
> >
> > For this I'm creating a group which will contain the face and the back
> > of the cards as its children, using this snippet:
> >
> > pixbuf_front = gdk_pixbuf_new_from_file ("card_front.png", NULL);
> > pixbuf_back = gdk_pixbuf_new_from_file ("card_back.png", NULL);
> >
> > deck->front = clutter_texture_new_from_pixbuf (pixbuf_front);
> > deck->back = clutter_texture_new_from_pixbuf (pixbuf_back);
> >
> > deck->card = clutter_group_new();
> > clutter_container_add_actor (CLUTTER_CONTAINER (deck->card),
> deck->front);
> > clutter_container_add_actor (CLUTTER_CONTAINER (deck->card), deck->back);
> > clutter_actor_lower (deck->front, deck->back);
> >
> > clutter_actor_set_position (deck->card, x, y);
> >
> > To rotate the card I'm adding this code on the timeline callback:
> >
> > clutter_actor_set_rotation (deck->card, CLUTTER_Y_AXIS, - 6.0 *
> > frame_num, 0, 0, 0);
> >
> > When the card rotates, I see the back of the card on the face and
> > back, if I add this code on the actor definition:
> >
> > clutter_actor_raise (deck->front, deck->back);
> >
> > I have the opposite behavior, I got the front on both sides of the card.
> >
> > How could I achieve the desired behavior? I've tried deal with the
> > depth property but without success.
> >
>
>
> Basically two options (assuming 0,5+);
>
> - Hook into behaviour/timeline to hide/show the back actor when
> rotated out of view.
>
> - Subclass ClutterGroup overide the paint method calling
> cogl_enable_depth_depth before chaining up and then disabling.
> Put the above in this group.
>
> Note we dont enable the depth test by default as it causes various odd
> edge cases or which there is no real fix. Thus best to self contain it.
>
>
> == Matthew
>
>
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