Function synfx_dsp::fast_cos

pub fn fast_cos(x: f32) -> f32

A faster implementation of cosine. It’s not that much faster than Rust’s built in cosine function. But YMMV.

Don’t forget to call init_cos_tab before using this!

 use synfx_dsp::*;
 init_cos_tab(); // Once on process initialization.

 // ...
 assert!((fast_cos(std::f32::consts::PI) - -1.0).abs() < 0.001);