Shader bonitão

#ifdef GL_ES
    precision mediump float;
#endif

#define TAU 6.28318530718

uniform vec2  u_resolution;
uniform vec2  u_mouse;
uniform float u_time;

void main() {

    vec2 pos = gl_FragCoord.xy;

    vec2 delta = pos - u_mouse;
    float len = length(delta);

    pos = pos - 100.0*delta/len;

    float cell_size = u_resolution.x / 8.0;
    float ix = floor(pos.x / cell_size);
    float iy = floor(pos.y / cell_size);
    float odd = sin(pos.x*0.5) + sin(pos.y*0.5);
    vec3 colorA = vec3(0.9, 0.7, 0.4);
    vec3 colorB = vec3(0.6, 0.4, 0.2);

    gl_FragColor = vec4(mix(colorA, colorB, odd), 1.0);

}