#version 330 core
uniform vec2 WindowSize;
uniform float time;
layout(location = 0) out vec4 color;

float rand(vec2 co){
    return fract(sin(dot(co, vec2(12.9898, 78.233))) * 43758.5453);
}

float cell_size = 0.1;

void main() {
    vec2 uv = gl_FragCoord.xy / WindowSize;
    // grid
    float glob = rand(uv + time);
    color = vec4(glob * (sin(time)/2 + 0.5), glob, 1.0, 1.0); //vec4(gl_FragCoord.xy / WindowSize, 0.0, 1.0);
}