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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
#ifdef GL_ES
precision mediump float;
#endif
varying vec4 color;
void main (void)
{
const float M_PI = 3.14159265358979323846;
vec3 c = 0.5 * M_PI * 2.0 * (color.rgb - 0.5);
vec3 o;
if(abs(c.r) < 0.5) // -45..45
o.r = 0.5 * (sin(c.r) / cos(c.r)) + 0.5;
else // 45..90, -45..-90
o.r = 0.5 * (cos(c.r) / sin(c.r)) + 0.5;
if(abs(c.g) < 0.5) // -45..45
o.g = 0.5 * (sin(c.g) / cos(c.g)) + 0.5;
else // 45..90, -45..-90
o.g = 0.5 * (cos(c.g) / sin(c.g)) + 0.5;
if(abs(c.b) < 0.5) // -45..45
o.b = 0.5 * (sin(c.b) / cos(c.b)) + 0.5;
else // 45..90, -45..-90
o.b = 0.5 * (cos(c.b) / sin(c.b)) + 0.5;
gl_FragColor = vec4(o, 1.0);
}
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