39 lines
694 B
GLSL
39 lines
694 B
GLSL
#version 330
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out vec4 fragColor;
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uniform vec2 res;
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uniform float time;
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const float sharpness = 300;
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const float PI = 3.14159265358979323846;
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mat2 rot(float a) {
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return mat2(
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cos(a), -sin(a),
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sin(a), cos(a)
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);
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}
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void main(void) {
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vec2 m = res/2;
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float s = min(m.x, m.y);
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vec2 p = (gl_FragCoord.xy - m) / s;
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float repeat = 8.0;
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float time_mod = mod(time / 200, repeat);
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float w = 20 * pow(2, time_mod);
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float f = time_mod / repeat;
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vec2 pr = p * rot(f * PI/2);
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float tp = mod(floor(log2(abs(pr.x/w)) + floor(log2(abs(pr.y/w)))), 2);
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float darken = min(min(abs(pr.x), abs(pr.y)) / 0.01, 1.0);
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float scene = tp * darken;
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fragColor = vec4(vec3(1, 1, 1) * scene, 1);
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}
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