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Introduces sad-node.[ch] implementing a simple sad face shader node,
normally inactive but made active when the shader files fail to reload.
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I'd originally intended to reuse this cache code for the checkered
background, but I don't think it's really necessary so just remove it.
It can always be brought back from the dead if desired.
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This is nothing to write home about, but it provides a little sandbox for
developing shader-generated textures in the spirit of shadertoy or the
demoscene tool bonzomatic.
It's more oriented towards developing shaders for use with libstage in
the small games I've been hacking on.
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