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47 lines
1.1 KiB
47 lines
1.1 KiB
uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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#define PI 3.14159265358979323846
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vec2 rotate2D(vec2 st, float angle, float view_at=0.5, float origin=0.5) {
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st -= view_at;
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st = mat2(cos(angle), -sin(angle),
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sin(angle), cos(angle)) * st;
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st += origin;
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return st;
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}
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float box(vec2 st, vec2 size, float smoothEdges) {
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size = vec2(0.5) - size * 0.5;
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vec2 aa = vec2(smoothEdges * 0.5);
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vec2 uv = smoothstep(size, size + aa, st);
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uv *= smoothstep(size, size+aa, vec2(1.0) - st);
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return uv.x * uv.y;
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}
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vec2 tile(vec2 st, float zoom) {
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st *= zoom;
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return fract(st);
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}
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float circle(vec2 st, float radius) {
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vec2 l = st - vec2(0.5);
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return 1.0 - smoothstep(radius - (radius * 0.01),
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radius+(radius * 0.01),
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dot(l,l) * 4.0);
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution;
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vec3 color = vec3(0.0);
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vec2 mouse_at = smoothstep(0.1, 0.9, u_mouse/u_resolution);
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st = tile(st, 4.0);
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st = rotate2D(st, PI * sin(u_time) / 4, 0.5, mouse_at);
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color = vec3(box(st, vec2(0.7), 0.01));
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gl_FragColor = vec4(color, 1.0);
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}
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