A weird game.
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turings-tarpit/assets/shaders/brownian_noise.frag

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uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
float random (in vec2 st) {
return fract(sin(dot(st.xy,
vec2(12.9898,78.233)))*
43758.5453123);
}
float noise(in vec2 st) {
vec2 i = floor(st);
vec2 f = fract(st);
float a = random(i);
float b = random(i + vec2(1.0, 0.0));
float c = random(i + vec2(0.0, 1.0));
float d = random(i + vec2(1.0, 1.0));
vec2 u = f * f * (3.0 - 2.0 * f);
return mix(a, b, u.x) +
(c - a) * u.y * (1.0 - u.x) +
(d - b) * u.x * u.y;
}
float fbm(in vec2 st, int octaves) {
float value = 0.0;
float amplitude = 0.5;
float frequency = 0.0;
for(int i = 0; i < octaves; i++) {
value += amplitude * noise(st);
st *= 2.0;
amplitude *= 0.5;
}
return value;
}
void main() {
vec2 st = gl_FragCoord.xy/u_resolution.xy;
st.x *= u_resolution.x/u_resolution.y;
vec3 color = vec3(0.0);
vec2 p = st * sqrt(u_mouse.x);
int oct = sqrt(u_mouse.y);
color += fbm(p, oct);
gl_FragColor = vec4(color, 1.0);
}