[Cogl] Transparency and depth

[Reza Ghassemi]

Hi,
Currently with clutter/cogl if you have partially transparent actors and
you are using depth testing and the actors are at different depths and
overlapping,  for the scene to look correct,  you must order the actors in
the scene so that they end up drawing back to front.  This is problematic
when the actors are being animated and changing their overlapping.
This is quite inconvenient and a management complication  to high level app
developers who would rather just leave the actors in the order they added
them.  Other systems like webkit/html5 seem to handle this.   Are there any
ideas out there on how to approach this or potentially add an optional
sorting algorithm based on depth to clutter's scene rendering system?

Thanks,

Reza
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/cogl/attachments/20131219/6b7d5427/attachment.html>