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added a missing definition of atanh in GLSL
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@ -614,6 +614,8 @@ void init() {
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1, "float acosh(float x) {",
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1, " return log(sqrt(x*x - 1.0) + x);",
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1, " }",
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1, "float atanh(float x) { return (log(1.+x)-log(1.-x))/2.; }",
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1, "float zlevel(vec4 h) {",
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1, " return (h[2] < 0.0 ? -1.0 : 1.0) * sqrt(h[2]*h[2] - h[0]*h[0] - h[1]*h[1]);",
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