| I'm trying to implement a really simple CoreImage Filter, to make lines of the input image go alternately from left>right and right>left, and thought the easiest way to do that would be to use the GLSL mod() function. For some reason though, this doesn't seem to be working. Am I doing something obviously wrong, or is this a bug? Here's the code: kernel vec4 alternateLines(sampler image) { vec2 xy = samplerCoord(image); xy.x = (mod(xy.y, 2.0) != 0.0) ? xy.x : samplerSize(image).x - xy.x; return sample(image, xy); } QTZ for QC 4 attached. a|x |
tb_cifilter_modulo.qtz
Description: application/quartzcomposer
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