strange shader effect behaviour.

[Jamil Drareni <urbeller gmail com>]

Hello,

I implemented a shader effect by:

1/ Sub-classing ClutterShaderEffect.
2/ Overriding paint_target() and get_static_shader_source()
3/ My shader uses a uniform, name it 'radius'.

If I create, let's say, 10 instances of my effect for 10 actors
, my understanding is at runtime, each instance of my effect
has its own copy of 'radius'. However, if for each effect I set a different
value for 'radius', all my 10 instances end up having the 'radius' of 
the last
effect. In other words, the last setted effect, sets the value for all 
instances.

Which makes me believe that, uniform variables are common to all 
instances of
the same sub-classed shader effect. This is rather strange ?

Also, is there a way for a shader effect to take into account its 
actor's opacity ?

Thank you,