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varying vec2 pos;
uniform float u_aspect_ratio;
uniform float u_time;
vec3 rand(vec3 co) {
float x = 2920.0 * sin(co.x * 21942.0 + co.y * 171324.0 + co.z * 2443.0 + 8912.0) * cos(co.x * 23157.0 * co.y * 217832.0 * co.z + 9758.0);
float alpha = acos(mod(x, 2.0) - 1.0);
float beta = 2132.0 * sin(co.x * 10233.0 + co.y * 103222.0 + co.z * 3243.0 + 2222.0) * cos(co.x * 38322.0 * co.y * 271828.0 * co.z + 1111.0);
return vec3(sin(alpha) * cos(beta), sin(alpha) * sin(beta), cos(alpha));
}
float dot_grid_gradient(vec3 floor_p, vec3 p) {
vec3 gradient = rand(floor_p);
vec3 dist = p - floor_p;
return dot(dist, gradient);
}
void main() {
vec3 p = vec3(pos * 5.0, sin(u_time) * 0.6 + u_time * 2.0);
p.x *= u_aspect_ratio;
vec3 p0 = floor(p);
vec3 p1 = p0 + vec3(1.0, 1.0, 1.0);
vec3 weight = p - p0;
weight = smoothstep(0.0, 1.0, weight);
float n0, n1, ix0, ix1, iy0, iy1;
n0 = dot_grid_gradient(vec3(p0.x, p0.y, p0.z), p);
n1 = dot_grid_gradient(vec3(p1.x, p0.y, p0.z), p);
ix0 = mix(n0, n1, weight.x);
n0 = dot_grid_gradient(vec3(p0.x, p1.y, p0.z), p);
n1 = dot_grid_gradient(vec3(p1.x, p1.y, p0.z), p);
ix1 = mix(n0, n1, weight.x);
iy0 = mix(ix0, ix1, weight.y);
n0 = dot_grid_gradient(vec3(p0.x, p0.y, p1.z), p);
n1 = dot_grid_gradient(vec3(p1.x, p0.y, p1.z), p);
ix0 = mix(n0, n1, weight.x);
n0 = dot_grid_gradient(vec3(p0.x, p1.y, p1.z), p);
n1 = dot_grid_gradient(vec3(p1.x, p1.y, p1.z), p);
ix1 = mix(n0, n1, weight.x);
iy1 = mix(ix0, ix1, weight.y);
float v = mix(iy0, iy1, weight.z);
v += 1.0;
v *= 0.5;
vec3 color = mix(vec3(0.4, 0.2, 1.0), vec3(1.0, 0.4, 0.4), v);
gl_FragColor = vec4(color, 1.0);
}
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