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GLSL

#version 440 core
out vec4 fcolor;
in vec4 pos;
vec3 hsv2rgb(vec3 c) {
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
void main() {
vec3 hsv = vec3(pos.w/3 + .6, 1, 1);
fcolor = vec4(hsv2rgb(hsv), 1);
}