[PD] [Gem] Alpha: transparency only in one direction?

[Roman Haefeli]

hi

during fooling around with alpha-channel i realized, that transparency
works only in one direction. i don't know much about opengl, but could
it be that it is an issue of my gfx-card (ati mobility radeon 9600)?
it seems that when an object (e.g. a rectangle), that is processed AFTER
another object is placed (from Gem-perspective) in front of this first
processed object, it gets transparent with alpha-values < 1. but when
you rotate the whole thing (180 degree), you have the first processed
object in front of the second processed object and the obj in front is
darker, but not transparent.

 the attached patch may explains better what i am trying to say.

is there a way to get transparency in all directions?

roman
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