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$(document).ready(function() {
$('.carousel-wrapper').slick({
dots: true,
infinite: true,
speed: 500,
slidesToShow: 1,
slidesToScroll: 1
});
var canvas_parent = document.getElementById('animated-bg');
var canvas = document.createElement('canvas');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight / 2;
window.sandbox_canvas = canvas;
canvas_parent.appendChild(canvas, null, { filtering: 'nearest' });
var sandbox = new GlslCanvas(canvas);
// randomize time
sandbox.timeLoad = Math.random() * 100000;
window.sandbox = sandbox; // for access
const shader_code = `
precision highp float;
uniform vec3 color;
uniform sampler2D t;
uniform vec2 tiles;
uniform float u_time;
uniform vec2 u_resolution;
uniform float symbol_count;
vec2 map_to_symbol_uv(vec2 image_coord, float symbol_index) {
float symbol_width = 1.0 / symbol_count;
float symbol_height = 1.0;
float symbol_x = symbol_index * symbol_width;
return vec2(symbol_x + image_coord.x * symbol_width, image_coord.y * symbol_height);
}
vec2 tile_index(vec2 p, vec2 tiles) {
return vec2(floor(p.x * tiles.x), floor(p.y * tiles.y));
}
vec2 tilefy (vec2 p, vec2 tiles) {
return vec2(fract(p.x * tiles.x), fract(p.y * tiles.y));
}
float randf(float n) {
return fract(sin(n) * 43758.5453123);
}
void main() {
vec2 uv = gl_FragCoord.xy / u_resolution.xy;
vec2 tile = tile_index(uv, tiles);
float tilerand = randf(tile.x + tile.y * tiles.x);
float v = tilerand + randf(floor(tilerand * u_time));
float diff = fract(tilerand * u_time);
float s = floor(v * 9.0);
vec2 tp = tilefy(uv, tiles);
vec2 tp_center = vec2(0.5, 0.5);
float d = distance(tp, tp_center);
float scale = min(sin(diff * 3.1415) * 1.2, 1.0);
tp = tp_center + (tp - tp_center) / scale;
if (tp.x < 0.0 || tp.x > 1.0 || tp.y < 0.0 || tp.y > 1.0) {
gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
return;
}
vec2 p = map_to_symbol_uv(tp, mod(s, symbol_count));
vec4 c = texture2D(t, p);
c.rgb *= color;
c.a *= uv.y * 4.0;
gl_FragColor = vec4(c.rgb * c.a, c.a);
}
`
sandbox.load(shader_code);
sandbox.setUniform('t', "https://cdn.duckonaut.dev/assets/images/symbols.png");
sandbox.setUniform('color', 42 / 255, 42 / 255, 80 / 255);
sandbox.setUniform('symbol_count', 9);
sandbox.setUniform('tiles', Math.ceil(window.innerWidth / 32), Math.ceil(window.innerHeight / 64));
addEventListener('resize', function() {
window.sandbox_canvas.width = window.innerWidth;
window.sandbox_canvas.height = window.innerHeight / 2;
window.sandbox.setUniform('tiles', Math.ceil(window.innerWidth / 32), Math.ceil(window.innerHeight / 64));
});
});
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