Added a graph view to the BOsc oscillator

src/dsp/helpers.rs

@@ -1304,6 +1304,26 @@ impl PolyBlepOscillator {
 
         s
     }
+
+    #[inline]
+    pub fn next_pulse_no_dc(&mut self, freq: f32, israte: f32, pw: f32) -> f32 {
+        let phase_inc = freq * israte;
+
+        let pw = (0.1 * pw) + ((1.0 - pw) * 0.5); // some scaling
+
+        let mut s =
+            if self.phase < pw { 1.0 }
+            else { -1.0 };
+
+        s += poly_blep(self.phase, phase_inc);
+        s -= poly_blep((self.phase + (1.0 - pw)).fract(),
+                            phase_inc);
+
+        self.phase += phase_inc;
+        self.phase = self.phase.fract();
+
+        s
+    }
 }
 
 //pub struct UnisonBlep {

src/dsp/node_bosc.rs

@@ -3,8 +3,11 @@
 // See README.md and COPYING for details.
 
 use crate::nodes::{NodeAudioContext, NodeExecContext};
-use crate::dsp::{NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals, NodeContext};
+use crate::dsp::{
-use crate::dsp::helpers::PolyBlepOscillator;
+    NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals, NodeContext,
+    GraphAtomData, GraphFun,
+};
+use crate::dsp::helpers::{PolyBlepOscillator, lerp};
 
 #[macro_export]
 macro_rules! fa_bosc_wtype { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
@@ -144,4 +147,45 @@ impl DspNode for BOsc {
 
         ctx_vals[0].set(out.read(ctx.nframes() - 1));
     }
+
+    fn graph_fun() -> Option<GraphFun> {
+        let mut osc = Box::new(PolyBlepOscillator::new(0.0));
+        let israte = 1.0 / 128.0;
+
+        Some(Box::new(move |gd: &dyn GraphAtomData, init: bool, x: f32, xn: f32| -> f32 {
+            let wtype = NodeId::BOsc(0).inp_param("wtype").unwrap().inp();
+            let pw    = NodeId::BOsc(0).inp_param("pw").unwrap().inp();
+            let det   = NodeId::BOsc(0).inp_param("det").unwrap().inp();
+
+            let wtype = gd.get(wtype as u32).map(|a| a.i()).unwrap_or(0);
+            let pw    = gd.get_denorm(pw as u32);
+            let det   = gd.get_norm(det as u32);
+
+            // the detune scaling with lerp is wrong...
+            // let pow = lerp((det + 0.2) * (1.0 / 0.4), 0.25, 4.0);
+            // let freq = (2.0_f32).powf(pow);
+            let freq = 2.0;
+
+            if init {
+                osc.reset();
+                if wtype == 1 {
+                    // we need to initialize the leaky integrator
+                    // in the triangle wave form, or it would look
+                    // a bit weird.
+                    for _ in 0..256 { osc.next_tri(freq, israte); }
+                }
+            }
+
+            let s =
+                match wtype {
+                    0     => (osc.next_sin(freq, israte)       + 1.0) * 0.5,
+                    1     => (osc.next_tri(freq, israte)       + 1.0) * 0.5,
+                    2     => (osc.next_saw(freq, israte)       + 1.0) * 0.5,
+                    3 | _ => (osc.next_pulse_no_dc(freq, israte, pw)
+                                                               + 1.0) * 0.5,
+                };
+
+            s * 0.9 + 0.05
+        }))
+    }
 }