57 lines
1.9 KiB
GLSL
57 lines
1.9 KiB
GLSL
uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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varying float vDistance;
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varying vec3 vPosition;
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float random(in float x) {
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return fract(sin(x) * 1e4);
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}
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// Based on Morgan McGuire @morgan3d
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// https://www.shadertoy.com/view/4dS3Wd
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float noise(in vec3 p) {
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const vec3 step = vec3(110.0, 241.0, 171.0);
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vec3 i = floor(p);
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vec3 f = fract(p);
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// For performance, compute the base input to a
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// 1D random from the integer part of the
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// argument and the incremental change to the
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// 1D based on the 3D -> 1D wrapping
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float n = dot(i, step);
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vec3 u = f * f * (3.0 - 2.0 * f);
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return mix(mix(mix(random(n + dot(step, vec3(0, 0, 0))), random(n + dot(step, vec3(1, 0, 0))), u.x), mix(random(n + dot(step, vec3(0, 1, 0))), random(n + dot(step, vec3(1, 1, 0))), u.x), u.y), mix(mix(random(n + dot(step, vec3(0, 0, 1))), random(n + dot(step, vec3(1, 0, 1))), u.x), mix(random(n + dot(step, vec3(0, 1, 1))), random(n + dot(step, vec3(1, 1, 1))), u.x), u.y), u.z);
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}
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// <https://www.shadertoy.com/view/Xd23Dh>
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// by inigo quilez <http://iquilezles.org/www/articles/voronoise/voronoise.htm>
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//
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vec3 hash3(vec2 p) {
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vec3 q = vec3(dot(p, vec2(127.1, 311.7)), dot(p, vec2(269.5, 183.3)), dot(p, vec2(419.2, 371.9)));
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return fract(sin(q) * 43758.5453);
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}
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float iqnoise(in vec2 x, float u, float v) {
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vec2 p = floor(x);
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vec2 f = fract(x);
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float k = 1.0 + 63.0 * pow(1.0 - v, 4.0);
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float va = 0.0;
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float wt = 0.0;
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for(int j = -2; j <= 2; j++) for(int i = -2; i <= 2; i++) {
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vec2 g = vec2(float(i), float(j));
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vec3 o = hash3(p + g) * vec3(u, u, 1.0);
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vec2 r = g - f + o.xy;
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float d = dot(r, r);
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float ww = pow(1.0 - smoothstep(0.0, 1.414, sqrt(d)), k);
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va += o.z * ww;
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wt += ww;
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}
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return va / wt;
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} |