added delay sync

src/dsp/helpers.rs

@@ -430,14 +430,14 @@ impl Trigger {
 }
 
 #[derive(Debug, Clone, Copy)]
-pub struct TriggerClock {
+pub struct TriggerPhaseClock {
     clock_phase:    f64,
     clock_inc:      f64,
     prev_trigger:   bool,
     clock_samples:  u32,
 }
 
-impl TriggerClock {
+impl TriggerPhaseClock {
     pub fn new() -> Self {
         Self {
             clock_phase:    0.0,
@@ -481,6 +481,47 @@ impl TriggerClock {
     }
 }
 
+#[derive(Debug, Clone, Copy)]
+pub struct TriggerSampleClock {
+    prev_trigger:   bool,
+    clock_samples:  u32,
+    counter:        u32,
+}
+
+impl TriggerSampleClock {
+    pub fn new() -> Self {
+        Self {
+            prev_trigger:   true,
+            clock_samples:  0,
+            counter:        0,
+        }
+    }
+
+    #[inline]
+    pub fn reset(&mut self) {
+        self.clock_samples = 0;
+        self.counter       = 0;
+    }
+
+    #[inline]
+    pub fn next(&mut self, trigger_in: f32) -> u32 {
+        if self.prev_trigger {
+            if trigger_in <= 0.25 {
+                self.prev_trigger = false;
+            }
+
+        } else if trigger_in > 0.75 {
+            self.prev_trigger  = true;
+            self.clock_samples = self.counter;
+            self.counter       = 0;
+        }
+
+        self.counter += 1;
+
+        self.clock_samples
+    }
+}
+
 /// Default size of the delay buffer: 5 seconds at 8 times 48kHz
 const DEFAULT_DELAY_BUFFER_SAMPLES : usize = 8 * 48000 * 5;
 
@@ -562,6 +603,13 @@ impl DelayBuffer {
         let idx  = ((self.wr + len) - offs) % len;
         self.data[idx]
     }
+
+    #[inline]
+    pub fn at(&self, delay_sample_count: usize) -> f32 {
+        let len  = self.data.len();
+        let idx  = ((self.wr + len) - delay_sample_count) % len;
+        self.data[idx]
+    }
 }
 
 // translated from Odin 2 Synthesizer Plugin

src/dsp/mod.rs

@@ -43,6 +43,7 @@ use crate::fa_sampl_dclick;
 use crate::fa_sampl_pmode;
 use crate::fa_sampl_dir;
 use crate::fa_ad_mult;
+use crate::fa_delay_mode;
 
 use node_amp::Amp;
 use node_sin::Sin;
@@ -463,9 +464,11 @@ macro_rules! node_list {
                [1 eoet],
             delay => Delay UIType::Generic UICategory::Signal
                (0  inp   n_id      d_id  r_id   f_def stp_d -1.0, 1.0, 1.0)
-               (1  time  n_time   d_time r_tms  f_ms  stp_m  0.0, 1.0, 0.5)
-               (2  fb    n_id      d_id  r_id   f_def stp_d  0.0, 1.0, 0.0)
-               (3  mix   n_id      d_id  r_id   f_def stp_d  0.0, 1.0, 0.5)
+               (1  trig  n_id      d_id  r_id   f_def stp_d -1.0, 1.0, 0.0)
+               (2  time  n_time   d_time r_tms  f_ms  stp_m  0.0, 1.0, 0.5)
+               (3  fb    n_id      d_id  r_id   f_def stp_d  0.0, 1.0, 0.0)
+               (4  mix   n_id      d_id  r_id   f_def stp_d  0.0, 1.0, 0.5)
+               {5 0 mode setting(0) fa_delay_mode 0 1}
                [0 sig],
             test => Test UIType::Generic UICategory::IOUtil
                (0 f     n_id      d_id   r_id   f_def stp_d 0.0, 1.0, 0.5)

src/dsp/node_delay.rs

@@ -4,23 +4,14 @@
 
 use crate::nodes::{NodeAudioContext, NodeExecContext};
 use crate::dsp::{NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals};
-use crate::dsp::helpers::{DelayBuffer, crossfade};
+use crate::dsp::helpers::{DelayBuffer, crossfade, TriggerSampleClock};
 
 #[macro_export]
-macro_rules! fa_dly_s { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
+macro_rules! fa_delay_mode { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
         let s =
             match ($v.round() as usize) {
-                0  => "Zero",
-                1  => "One",
-                2  => "Two",
-                3  => "Three",
-                4  => "Four",
-                5  => "Five",
-                6  => "Six",
-                7  => "Seven",
-                8  => "Eigth",
-                9  => "Nine",
-                10 => "Ten",
+                0  => "Time",
+                1  => "Sync",
                 _  => "?",
             };
         write!($formatter, "{}", s)
@@ -31,6 +22,7 @@ macro_rules! fa_dly_s { ($formatter: expr, $v: expr, $denorm_v: expr) => { {
 pub struct Delay {
     buffer:             Box<DelayBuffer>,
     fb_sample:          f32,
+    clock:              TriggerSampleClock,
 }
 
 impl Delay {
@@ -38,12 +30,16 @@ impl Delay {
         Self {
             buffer:            Box::new(DelayBuffer::new()),
             fb_sample:         0.0,
+            clock:             TriggerSampleClock::new(),
         }
     }
 
     pub const inp  : &'static str =
         "Delay inp\nThe signal input for the delay. You can mix in this \
          input to the output with the 'mix' parameter.\nRange: (-1..1)";
+    pub const trig : &'static str =
+        "Delay trig\nIf you set 'mode' to 'Sync', the delay time will be \
+         synchronized to the trigger signals received on this input.\nRange: (-1..1)";
     pub const time : &'static str =
         "Delay time\nThe delay time. It can be freely modulated to your \
          likings.\nRange: (0..1)";
@@ -52,6 +48,11 @@ impl Delay {
         \nRange: (0..1)";
     pub const mix  : &'static str =
         "Delay mix\nThe dry/wet mix of the delay.\nRange: (0..1)";
+    pub const mode : &'static str =
+        "Delay mode\nAllows different operating modes of the delay. \
+        'Time' is the default, and means that the 'time' input \
+        specifies the delay time. 'Sync' will synchronize the delay time \
+        with the trigger signals on the 'trig' input.";
     pub const sig  : &'static str =
         "Delay sig\nThe output of the dry/wet mix.\nRange: (-1..1)";
 
@@ -86,19 +87,22 @@ impl DspNode for Delay {
 
     fn reset(&mut self) {
         self.buffer.reset();
+        self.clock.reset();
     }
 
     #[inline]
     fn process<T: NodeAudioContext>(
         &mut self, ctx: &mut T, _ectx: &mut NodeExecContext,
-        _atoms: &[SAtom], _params: &[ProcBuf], inputs: &[ProcBuf],
-        outputs: &mut [ProcBuf], _led: LedPhaseVals)
+        atoms: &[SAtom], _params: &[ProcBuf], inputs: &[ProcBuf],
+        outputs: &mut [ProcBuf], ctx_vals: LedPhaseVals)
     {
-        use crate::dsp::{out, inp, denorm};
+        use crate::dsp::{at, out, inp, denorm};
 
         let buffer  = &mut *self.buffer;
 
+        let mode = at::Delay::mode(atoms);
         let inp  = inp::Delay::inp(inputs);
+        let trig = inp::Delay::trig(inputs);
         let time = inp::Delay::time(inputs);
         let fb   = inp::Delay::fb(inputs);
         let mix  = inp::Delay::mix(inputs);
@@ -106,10 +110,10 @@ impl DspNode for Delay {
 
         let mut fb_s = self.fb_sample;
 
+        if mode.i() == 0 {
             for frame in 0..ctx.nframes() {
                 let dry = inp.read(frame);
-            buffer.feed(
-                dry + fb_s * denorm::Delay::fb(fb, frame));
+                buffer.feed(dry + fb_s * denorm::Delay::fb(fb, frame));
 
                 let out_sample =
                     buffer.cubic_interpolate_at(
@@ -121,7 +125,27 @@ impl DspNode for Delay {
 
                 fb_s = out_sample;
             }
+        } else {
+            for frame in 0..ctx.nframes() {
+                let dry = inp.read(frame);
+                buffer.feed(dry + fb_s * denorm::Delay::fb(fb, frame));
+
+                let clock_samples =
+                    self.clock.next(denorm::Delay::trig(trig, frame));
+
+                let out_sample = buffer.at(clock_samples as usize);
+
+                out.write(frame,
+                    crossfade(dry, out_sample,
+                        denorm::Delay::mix(mix, frame).clamp(0.0, 1.0)));
+
+                fb_s = out_sample;
+            }
+        }
 
         self.fb_sample = fb_s;
+
+        let last_frame = ctx.nframes() - 1;
+        ctx_vals[0].set(out.read(last_frame));
     }
 }

src/dsp/node_tseq.rs

@@ -3,7 +3,7 @@
 // See README.md and COPYING for details.
 
 use crate::nodes::{NodeAudioContext, NodeExecContext};
-use crate::dsp::helpers::TriggerClock;
+use crate::dsp::helpers::TriggerPhaseClock;
 use crate::dsp::{NodeId, SAtom, ProcBuf, DspNode, LedPhaseVals};
 use crate::dsp::tracker::TrackerBackend;
 
@@ -26,7 +26,7 @@ macro_rules! fa_tseq_cmode { ($formatter: expr, $v: expr, $denorm_v: expr) => {
 #[derive(Debug)]
 pub struct TSeq {
     backend:       Option<Box<TrackerBackend>>,
-    clock:         TriggerClock,
+    clock:         TriggerPhaseClock,
     srate:         f64,
 }
 
@@ -39,7 +39,7 @@ impl TSeq {
         Self {
             backend:       None,
             srate:         48000.0,
-            clock:         TriggerClock::new(),
+            clock:         TriggerPhaseClock::new(),
         }
     }