pseudo rand

https://gyazo.com/8c7734d80d300e3fb680ecba272fdbc6

code:glsl

precision mediump float;

uniform float time;

uniform vec2 mouse;

uniform vec2 resolution;

float pseudo_rand() {

float a = fract(dot(gl_FragCoord.xy, vec2(2.067390879775102, 12.451168662908249))) - 0.5;

float s = a * (6.182785114200511 + a*a * (-38.026512460676566 + a*a * 53.392573080032137));

float t = fract(s * 43758.5453);

return t;

}

void main( void ) {

gl_FragColor = vec4(vec3(pseudo_rand()), 1.0);

}