And we have actual animation (simply loops through the red channel, wrapping around) with XCB/Xlib! This was way too much work to figure out gist.github.com/weskerfoot/f75
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I have an opengl/glx implementation of almost the same thing, which I will probably end up using in the long run (or SDL), but it was very nice to get this working. Next up: animating some objects, and getting sound to work.