gistfile1.glsl

vec4 viridis(float x) {
  const float e0 = 0.0;
  const vec4 v0 = vec4(0.26666666666666666,0.00392156862745098,0.32941176470588235,1);
  const float e1 = 0.13;
  const vec4 v1 = vec4(0.2784313725490196,0.17254901960784313,0.47843137254901963,1);
  const float e2 = 0.25;
  const vec4 v2 = vec4(0.23137254901960785,0.3176470588235294,0.5450980392156862,1);
  const float e3 = 0.38;
  const vec4 v3 = vec4(0.17254901960784313,0.44313725490196076,0.5568627450980392,1);
  const float e4 = 0.5;
  const vec4 v4 = vec4(0.12941176470588237,0.5647058823529412,0.5529411764705883,1);
  const float e5 = 0.63;
  const vec4 v5 = vec4(0.15294117647058825,0.6784313725490196,0.5058823529411764,1);
  const float e6 = 0.75;
  const vec4 v6 = vec4(0.3607843137254902,0.7843137254901961,0.38823529411764707,1);
  const float e7 = 0.88;
  const vec4 v7 = vec4(0.6666666666666666,0.8627450980392157,0.19607843137254902,1);
  const float e8 = 1.0;
  const vec4 v8 = vec4(0.9921568627450981,0.9058823529411765,0.1450980392156863,1);
  float a0 = smoothstep(e0,e1,x);
  float a1 = smoothstep(e1,e2,x);
  float a2 = smoothstep(e2,e3,x);
  float a3 = smoothstep(e3,e4,x);
  float a4 = smoothstep(e4,e5,x);
  float a5 = smoothstep(e5,e6,x);
  float a6 = smoothstep(e6,e7,x);
  float a7 = smoothstep(e7,e8,x);
  return max(mix(v0,v1,a0)*step(e0,x)*step(x,e1),
    max(mix(v1,v2,a1)*step(e1,x)*step(x,e2),
    max(mix(v2,v3,a2)*step(e2,x)*step(x,e3),
    max(mix(v3,v4,a3)*step(e3,x)*step(x,e4),
    max(mix(v4,v5,a4)*step(e4,x)*step(x,e5),
    max(mix(v5,v6,a5)*step(e5,x)*step(x,e6),
    max(mix(v6,v7,a6)*step(e6,x)*step(x,e7),mix(v7,v8,a7)*step(e7,x)*step(x,e8)
  )))))));
}



void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    // Normalized pixel coordinates (from 0 to 1)
    vec2 uv = fragCoord/iResolution.xy;
    
    fragColor = viridis(texture(iChannel0, vec2(uv.x, 0)).x);
}