Rust version of additive core, for documentation

synth/src/oidos_generate.rs

 
-#![allow(dead_code)]
-
 use std::{f32, f64};
 use std::mem::transmute;
 use std::ops::{Index};
@@ -423,6 +421,28 @@ impl SoundGenerator for OidosSoundGenerator {
 	}
 }
 
+impl OidosSoundGenerator {
+	/// Functionally equivalent to the vectorized asm versions, but much slower.
+	#[allow(unused)]
+	fn additive_core(&mut self) -> f64 {
+		let mut s = 0f64;
+		for i in 0..self.n_partials {
+			let re = self.state_re[i] * self.step_re[i] - self.state_im[i] * self.step_im[i];
+			let im = self.state_re[i] * self.step_im[i] + self.state_im[i] * self.step_re[i];
+			self.state_re[i] = re;
+			self.state_im[i] = im;
+
+			let f = self.filter_low[i].min(self.filter_high[i]).min(1.0).max(0.0);
+			self.filter_low[i] += self.f_add_low;
+			self.filter_high[i] += self.f_add_high;
+
+			s += re * f;
+		}
+
+		s
+	}
+}
+
 extern "cdecl" {
 	fn supports_avx() -> bool;
 	fn additive_core_sse2(state_re: *mut f64, state_im: *mut f64, step_re: *const f64, step_im: *const f64,