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| mat2 rotation2d(float angle) { | |
| float s = sin(angle); | |
| float c = cos(angle); | |
| return mat2( | |
| c, -s, | |
| s, c | |
| ); | |
| } | |
| vec2 rotate(vec2 v, float angle) { | |
| return rotation2d(angle) * v; | |
| } |
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