​

varying vec2 vTexCoord;

​

uniform sampler2D uTexture;

uniform vec2 uResolution;

​

const float route3 = 1.73205;

​

// https://www.youtube.com/watch?v=VmrIDyYiJBA

vec2 hexagonal(vec2 uv) {

  vec2 r = vec2(1.0, route3);

  vec2 h = r * 0.5;

  vec2 g0 = mod(uv, r) - h;

  vec2 g1 = mod(uv - h, r) - h;

  vec2 g;

  if (length(g0) < length(g1)) {

      g = g0;

  } else {

      g = g1;

  }

  vec2 id = uv - g;

  return id;

}

​

​

void main() {  

  vec2 uv = vTexCoord;

  uv = 1.0 - uv;

​

  float q = min(uResolution.x, uResolution.y) * 0.03;

  vec2 st = hexagonal(uv * q) / q;

​

  vec4 tex = texture2D(uTexture, st);

  vec3 color = vec3(tex.rgb);

  gl_FragColor = vec4(color, 1.0);

}

​