2_2_hash1d

Code 2.3, Figure 2.4:

2_2_hash1d.frag

#version 300 es precision highp float; precision highp int; out vec4 fragColor; uniform float u_time; uniform vec2 u_resolution; uint k = 0x456789abu; const uint UINT_MAX = 0xffffffffu; uint uhash11(uint n){ n ^= (n << 1); n ^= (n >> 1); n *= k; n ^= (n << 1); return n * k; } float hash11(float p){ uint n = floatBitsToUint(p); return float(uhash11(n)) / float(UINT_MAX); } void main(){ float time = floor(60.0 * u_time); vec2 pos = gl_FragCoord.xy + time; fragColor.rgb = vec3(hash11(pos.x)); fragColor.a = 1.0; }

#version 300 es
precision highp float;
precision highp int;
out vec4 fragColor;
uniform float u_time;
uniform vec2 u_resolution;
uint k = 0x456789abu;
const uint UINT_MAX = 0xffffffffu;

uint uhash11(uint n){
  n ^= (n << 1);
  n ^= (n >> 1);
  n *= k;
  n ^= (n << 1);
  return n * k;
}

float hash11(float p){
  uint n = floatBitsToUint(p);
  return float(uhash11(n)) / float(UINT_MAX);
}

void main(){
  float time = floor(60.0 * u_time);
  vec2 pos = gl_FragCoord.xy + time;
  fragColor.rgb = vec3(hash11(pos.x));
  fragColor.a = 1.0;
}