src/data/shaders/noisyblocks.frag

   1 /* This is free and unencumbered software released into the public
   2    domain. To the extent possible under law, the author of this file
   3    waives all copyright and related or neighboring rights to it.
   4 */
   5
   6 precision highp float;
   7
   8 varying vec2 fTexCoord;
   9 varying vec4 fColor;
  10 uniform sampler2D tex;
  11
  12 uniform vec2 resolution;
  13 uniform float cut;
  14 uniform float range;
  15
  16 void main(void) {
  17     vec2 coord = floor(fTexCoord * resolution);
  18     vec3 n = vec3(coord.xy, cut);
  19     float p = 1.0 - range * abs(snoise(n));
  20     vec3 modulated = fColor.rgb * p;
  21     vec4 texColor = texture2D(tex, fTexCoord);
  22     gl_FragColor = vec4(modulated * fColor.a, fColor.a) * texColor;
  23 }