[jitter] first shader

hello andrew,
thanks, that solved one of the problems
I read that glsl is not optimized for conditional stuff, but I have to 
learn more glsl commands to see what could replace them.
the thing is, I only want a comparison of 3 of the 4 channels. yes, I 
would like to boost efficiency by using glsl internal commands.
marius.

andrew benson wrote:
> your problem is most likely in this line:
> 
>  <param name="image" type="float" default="0" />
> 
> Change type to "int" and you will probably be okay.
> 
> FWIW, I would recommend ditching all of that conditional stuff (if...) 
> and replacing with mix() and step() type functions.  Support for 
> conditional statements is pretty unpredictable in GLSL.
> 
> Best,
> Andrew B.
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