41 lines
690 B
GLSL
41 lines
690 B
GLSL
#version 330
|
|
|
|
out vec4 fragColor;
|
|
|
|
uniform vec2 res;
|
|
uniform float time;
|
|
|
|
const float sharpness = 300;
|
|
|
|
const float PI = 3.14159265358979323846;
|
|
|
|
|
|
mat2 rot(float a) {
|
|
return mat2(
|
|
cos(a), -sin(a),
|
|
sin(a), cos(a)
|
|
);
|
|
}
|
|
|
|
float square(vec2 m, float a, float r, vec2 p) {
|
|
vec2 diff = abs((m - p) * rot(r));
|
|
float d = max(diff.x, diff.y);
|
|
|
|
return clamp((a - d)*sharpness, 0.0, 1.0);
|
|
}
|
|
|
|
void main(void) {
|
|
vec2 m = res/2;
|
|
float s = min(m.x, m.y);
|
|
vec2 p = (gl_FragCoord.xy - m) / s;
|
|
|
|
float scene = 0;
|
|
|
|
int n = 10;
|
|
for (int i = 1; i <= n; i++) {
|
|
float c = square(vec2(0, 0), 0.5, PI/2*i/n - time/500, p);
|
|
scene = abs(scene - c);
|
|
}
|
|
|
|
fragColor = vec4(vec3(1, 1, 1) * scene, 1);
|
|
}
|