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Updated (r45) to fix a glitch that was causing all images to be processed in 32-bit (only 16-bit images should be handled that way), which made GPU processing slow probably on anything older than a Geforce 9. (Can't test everything on the older hardware, since it's downstairs and stupid remote desktop doesn't like OpenGL...) Also, fixed a math issue (grr, atan2 in a pixel shader isn't the same as atan2 in C) that was causing artifacts when alt. amplitude was turned off.