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16 lines
451 B
Plaintext
16 lines
451 B
Plaintext
vec2 rotate_uv(vec2 uv, vec2 center, float rotation, bool use_degrees){
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if(use_degrees){
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rotation = rotation * (3.1415926/180.0);
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}
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vec2 _uv = uv;
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_uv -= center;
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float _s = sin(rotation);
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float _c = cos(rotation);
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mat2 _rotation_matrix = mat2(vec2(_c, -_s), vec2(_s, _c));
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_rotation_matrix *= 0.5;
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_rotation_matrix += 0.5;
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_rotation_matrix = _rotation_matrix * 2.0 - 1.0;
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_uv.xy = _uv.xy * _rotation_matrix;
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_uv += center;
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return _uv;
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} |