precision mediump float;

uniform float u_time;
uniform vec2 u_mouse;
uniform vec2 u_resolution;
varying vec2 v_uv;

vec2 rotate2D(vec2 p, float angle) {
    float s = sin(angle), c = cos(angle);
    return mat2(c, -s, s, c) * p;
}

float sdBox(vec2 p, vec2 b) {
    vec2 d = abs(p) - b;
    return length(max(d, 0.0)) + min(max(d.x, d.y), 0.0);
}

vec3 getRainbow(float t) {
    return 0.5 + 0.5 * cos(6.28318 * (t + vec3(0.0, 0.33, 0.67)));
}

float hash(vec2 p) {
    return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453123);
}

void main() {
    vec2 uv = v_uv;
    vec2 aspect = vec2(u_resolution.x/u_resolution.y, 1.0);
    uv = (uv - 0.5) * aspect;
    
    float mouseInfluence = 1.0 - length(u_mouse - v_uv) * 2.0;
    mouseInfluence = clamp(mouseInfluence, 0.0, 1.0);
    
    vec2 grid = rotate2D(uv, 0.785398);
    grid *= 8.0 + mouseInfluence * 2.0;
    
    vec2 id = floor(grid);
    vec2 gv = fract(grid) - 0.5;
    
    float d = sdBox(gv, vec2(0.3));
    float cellNoise = hash(id + floor(u_time));
    
    vec3 color = getRainbow(length(id) * 0.1 + u_time * 0.2);
    
    float glassEffect = smoothstep(0.1, -0.1, d);
    glassEffect *= 0.8 + 0.2 * sin(cellNoise * 6.28318 + u_time * 2.0);
    
    vec3 finalColor = mix(color, vec3(1.0), glassEffect * 0.3);
    finalColor = mix(finalColor, color * 1.5, mouseInfluence * 0.5);
    
    float edge = smoothstep(0.01, 0.0, abs(d));
    finalColor += edge * 0.2;
    
    gl_FragColor = vec4(finalColor, 1.0);
    
    #include <colorspace_fragment>
}