Skip to content

Instantly share code, notes, and snippets.

@gre
Created April 25, 2021 11:24
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save gre/b3d30368509ec31b2f2fb98a319d1600 to your computer and use it in GitHub Desktop.
Save gre/b3d30368509ec31b2f2fb98a319d1600 to your computer and use it in GitHub Desktop.
precision highp float;
varying vec2 uv;
uniform float time;
vec3 palette( in float t, in vec3 a, in vec3 b, in vec3 c, in vec3 d ) {
return a + b*cos( 6.28318*(c*t+d) );
}
vec3 color (float t) {
return palette(
t,
vec3(.5),
vec3(.6 + .1 * cos(.3 * time)),
vec3(1.),
vec3(0.22, 0.5, 0.77)
);
}
const float PI = ${Math.PI};
float rect2d (vec2 p, vec2 sz) {
return max(abs(p.x) - sz.x, abs(p.y) - sz.y);
}
float d2d (vec2 p, float w, float h) {
return min(rect2d(p, vec2(w, h)), length(p-vec2(w, .0))-h);
}
float bitcoin2d (vec2 p) {
p.y -= 0.1;
p.x += .02;
float inner = d2d(p, 0.04, 0.06);
float outer = d2d(p, 0.1, 0.1);
float top = max(-inner, outer);
top = min(top, rect2d(p - vec2(-.12, .08), vec2(.02)));
top = min(top, rect2d(p - vec2(-.06, .14), vec2(.02, .04)));
top = min(top, rect2d(p - vec2(.04, .14), vec2(.02, .04)));
p.x -= .01;
p.y += 0.2;
inner = d2d(p, 0.04, 0.06);
outer = d2d(p, 0.11, 0.12);
float bottom = max(-inner, outer);
bottom = min(bottom, rect2d(p - vec2(-.13, -.09), vec2(.03)));
bottom = min(bottom, rect2d(p - vec2(-.06, -.16), vec2(.02, .04)));
bottom = min(bottom, rect2d(p - vec2(.04, -.16), vec2(.02, .04)));
float f = min(top, bottom);
return f;
}
void main() {
float v = bitcoin2d(uv-.5);
v = max(-step(fract(time), 0.5), v); // blink 500ms
gl_FragColor = vec4(
step(v, 0.) * color(1.6 * (uv.y + time)) +
step(0., v) * color(sqrt(max(v, 0.)) - 2. * time),
1.0);
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment