using opengl to filter texture?

[Mike Woodworth <mike at divergentmedia dot com>]

so,

i've made great progress with the help of glgeterror() and a few  
online tutorials.  i now have opengl drawing my gworld to an opengl  
scene.  now i'd like to extend this to allow me to filter the texture  
before displaying it - ie: lighten, darken, change hue, and  
contrast.  is this done via shaders?  what should i search for, where  
do i start?  can it be done in rb?
mike
--
Mike Woodworth
mike at divergentmedia dot com



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