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8 lines
374 B
Plaintext
8 lines
374 B
Plaintext
vec2 swirl_uv(vec2 uv, vec2 center, float strength, vec2 offset){
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vec2 _delta = uv - center;
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float _inverse_length = 1.0 - length(_delta);
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float _angle = strength * _inverse_length;
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float _x = cos(_angle) * _delta.x - sin(_angle) * _delta.y;
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float _y = sin(_angle) * _delta.x + cos(_angle) * _delta.y;
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return vec2(_x + center.x + offset.x, _y + center.y + offset.y);
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} |