add background alpha property to gltransformation

[Nicolas Dufresne]

Le vendredi 01 janvier 2016 à 22:32 -0800, John Ludwig a écrit :
> I’d like to be able to control the default background alpha in
> gltransformation, in particular i’d like to emit textures with
> transparent backgrounds.  I’d suggest adding a property to control
> the background alpha, and then replacing the alpha arg in the clear
> color call in gltransformation.c:600 with this property value.  Is
> this something that would be generally useful?

I think so, though having alpha output format is rather new, and I
believe most user will prefer transparent to black as background, so
maybe start with making it transparent by default.

Nicolas

p.s. just in case you don't know yet, open a bug, and mark is has an
enhancement and attach your patches.
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