vec4 hot (float x) {
  const float e0 = 0.0;
  const vec4 v0 = vec4(0,0,0,1);
  const float e1 = 0.3;
  const vec4 v1 = vec4(0.9019607843137255,0,0,1);
  const float e2 = 0.6;
  const vec4 v2 = vec4(1,0.8235294117647058,0,1);
  const float e3 = 1.0;
  const vec4 v3 = vec4(1,1,1,1);
  float a0 = smoothstep(e0,e1,x);
  float a1 = smoothstep(e1,e2,x);
  float a2 = smoothstep(e2,e3,x);
  return max(mix(v0,v1,a0)*step(e0,x)*step(x,e1),
    max(mix(v1,v2,a1)*step(e1,x)*step(x,e2),mix(v2,v3,a2)*step(e2,x)*step(x,e3)
  ));
}
#pragma glslify: export(hot)