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55 lines
1.5 KiB
GLSL
55 lines
1.5 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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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))),
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random(n + dot(step, vec3(1,0,0))),
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u.x),
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mix(random(n + dot(step, vec3(0,1,0))),
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random(n + dot(step, vec3(1,1,0))),
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u.x),
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u.y),
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mix(mix(random(n + dot(step, vec3(0,0,1))),
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random(n + dot(step, vec3(1,0,1))),
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u.x),
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mix(random(n + dot(step, vec3(0,1,1))),
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random(n + dot(step, vec3(1,1,1))),
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u.x),
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u.y),
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u.z);
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution.xy;
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vec3 color = vec3(0.0);
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vec3 pos = vec3(st*5.0,u_time*0.5);
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color = vec3(noise(pos));
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gl_FragColor = vec4(color,1.0);
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}
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