GLSL random function

GLSL_Random

// From glfx.js : https://github.com/evanw/glfx.js
float random(vec3 scale, float seed) {
	/* use the fragment position for a different seed per-pixel */
	return fract(sin(dot(gl_FragCoord.xyz + seed, scale)) * 43758.5453 + seed);
}
    
float rand(vec2 co){
	return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}