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Noise3c.frag
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Noise3c.frag
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#ifdef GL_ES
precision highp float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
//---------------------------------------------------------------------
#define seed 43758.5453123
vec2 random2(vec2 st) {
st = vec2(dot(st, vec2(127.1, 311.7)),
dot(st, vec2(269.5, 183.3)));
return -1.0 + 2.0 * fract(sin(st) * seed);
}
// Gradient Noise by Inigo Quilez - iq/2013
// https://www.shadertoy.com/view/XdXGW8
float noise(vec2 st) {
vec2 i = floor(st);
vec2 f = fract(st);
vec2 u = f * f * (3.0 - 2.0 * f);
return mix( mix( dot( random2(i + vec2(0.0, 0.0) ), f - vec2(0.0, 0.0) ),
dot( random2(i + vec2(1.0, 0.0) ), f - vec2(1.0, 0.0) ), u.x),
mix( dot( random2(i + vec2(0.0, 1.0) ), f - vec2(0.0, 1.0) ),
dot( random2(i + vec2(1.0, 1.0) ), f - vec2(1.0, 1.0) ), u.x), u.y);
}
float circle(in vec2 _st, in float _radius) {
vec2 dist = _st - vec2(0.5);
return 1. - smoothstep(_radius - (_radius * 0.01),
_radius + (_radius * 0.01),
dot(dist, dist) * 4.0);
}
//---------------------------------------------------------------------
void main() {
vec2 st = gl_FragCoord.xy / u_resolution.xy;
st *= 5.0;
st -= 2.0;
vec3 color = vec3(0.0);
vec2 translate = vec2(sin(u_time) , cos(u_time));
translate.x += noise(st);
translate.y += noise(st);
st += translate * 1.;
color += circle(st, 2.);
gl_FragColor = vec4(color, 1.0);
}