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varying vec2 pos;
uniform float u_aspect_ratio;
vec2 rand(vec2 co) {
float random = 2920.0 * sin(co.x * 21942.0 + co.y * 171324.0 + 8912.0) * cos(co.x * 23157.0 * co.y * 217832.0 + 9758.0);
return vec2(cos(random), sin(random));
}
float dot_grid_gradient(vec2 floor_p, vec2 p) {
vec2 gradient = rand(floor_p);
vec2 dist = p - floor_p;
return dot(dist, gradient);
}
void main() {
vec2 p = pos * 10.0;
p.x *= u_aspect_ratio;
vec2 p0 = floor(p);
vec2 p1 = p0 + vec2(1.0, 1.0);
vec2 weight = p - p0;
weight = smoothstep(0.0, 1.0, weight);
float n0 = dot_grid_gradient(vec2(p0.x, p0.y), p);
float n1 = dot_grid_gradient(vec2(p1.x, p0.y), p);
float ix0 = mix(n0, n1, weight.x);
n0 = dot_grid_gradient(vec2(p0.x, p1.y), p);
n1 = dot_grid_gradient(vec2(p1.x, p1.y), p);
float ix1 = mix(n0, n1, weight.x);
float v = mix(ix0, ix1, weight.y);
v += 1.0;
v *= 0.5;
vec3 color = mix(vec3(0.4, 0.2, 1.0), vec3(1.0, 0.6, 0.6), v);
gl_FragColor = vec4(color, 1.0);
}
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