From 22cb7d7cbcacbfe3a7d3a2d454e6b8cf49ae989c Mon Sep 17 00:00:00 2001
From: Graham Northup <grissess@nexusg.org>
Date: Fri, 13 Oct 2017 12:54:04 -0400
Subject: Added LUTs and ControlRate; improved parser

---
 src/synth/adsr.rs | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 src/synth/adsr.rs

(limited to 'src/synth/adsr.rs')

diff --git a/src/synth/adsr.rs b/src/synth/adsr.rs
new file mode 100644
index 0000000..ca7be9c
--- /dev/null
+++ b/src/synth/adsr.rs
@@ -0,0 +1,122 @@
+use super::*;
+
+#[derive(Debug,Clone,Copy,PartialEq,Eq)]
+pub enum Phase {
+    Delay,
+    Attack,
+    Hold,
+    Decay,
+    Sustain,
+    Release,
+}
+
+#[derive(Debug)]
+pub struct DAHDSR {
+    pub delay: GenBox,
+    pub attack: GenBox,
+    pub hold: GenBox,
+    pub decay: GenBox,
+    pub sustain: GenBox,
+    pub release: GenBox,
+    pub gate: GenBox,
+    pub phase: Phase,
+    pub cur: f32,
+    pub attack_cd: f32,
+    pub decay_cd: f32,
+    pub buf: SampleBuffer,
+}
+
+impl Generator for DAHDSR {
+    fn eval<'a>(&'a mut self, params: &Parameters) -> &'a SampleBuffer {
+        self.buf.rate = Rate::Sample;
+
+        let delay = self.delay.eval(params).first();
+        let attack = self.attack.eval(params).first();
+        let hold = self.attack.eval(params).first();
+        let decay = self.decay.eval(params).first();
+        let sustain = self.sustain.eval(params).first();
+        let release = self.release.eval(params).first();
+        let gate = self.gate.eval(params).first();
+
+        if gate >= 0.5 {
+            if self.phase == Phase::Release {
+                self.phase = Phase::Delay;
+                self.attack_cd = delay;
+                self.cur = 0.0;
+            }
+        } else{
+            self.phase = Phase::Release;
+        }
+
+        for samp in self.buf.samples.iter_mut() {
+            match self.phase {
+                Phase::Delay => {
+                    self.attack_cd -= 1.0;
+                    if self.attack_cd <= 0.0 {
+                        self.phase = Phase::Attack;
+                    }
+                },
+                Phase::Attack => {
+                    self.cur += attack;
+                    if self.cur >= 1.0 {
+                        self.cur = 1.0;
+                        self.phase = Phase::Hold;
+                        self.decay_cd = hold;
+                    }
+                },
+                Phase::Hold => {
+                    self.decay_cd -= 1.0;
+                    if self.decay_cd <= 0.0 {
+                        self.phase = Phase::Decay;
+                    }
+                },
+                Phase::Decay => {
+                    self.cur -= decay;
+                    if self.cur <= sustain {
+                        self.cur = sustain;
+                        self.phase = Phase::Sustain;
+                    }
+                },
+                Phase::Sustain => {
+                    self.cur = sustain;
+                },
+                Phase::Release => {
+                    self.cur -= release;
+                    if self.cur < 0.0 {
+                        self.cur = 0.0;
+                    }
+                },
+            }
+            *samp = self.cur;
+        }
+
+        &self.buf
+    }
+    fn buffer(&self) -> &SampleBuffer { &self.buf }
+    fn set_buffer(&mut self, buf: SampleBuffer) -> SampleBuffer {
+        mem::replace(&mut self.buf, buf)
+    }
+}
+
+pub struct DAHDSRFactory;
+
+impl GeneratorFactory for DAHDSRFactory {
+    fn new(&self, params: &mut FactoryParameters) -> Result<GenBox, GenFactoryError> {
+        Ok(Box::new(DAHDSR {
+            delay: params.remove_param("delay", 1)?.into_gen()?,
+            attack: params.remove_param("attack", 2)?.into_gen()?,
+            hold: params.remove_param("hold", 3)?.into_gen()?,
+            decay: params.remove_param("decay", 4)?.into_gen()?,
+            sustain: params.remove_param("sustain", 5)?.into_gen()?,
+            release: params.remove_param("release", 6)?.into_gen()?,
+            gate: params.remove_param("gate", 0)?.into_gen()?,
+            phase: Phase::Release,
+            cur: 0.0,
+            attack_cd: 0.0,
+            decay_cd: 0.0,
+            buf: SampleBuffer::new(params.env.default_buffer_size),
+        }))
+    }
+}
+
+pub static Factory: DAHDSRFactory = DAHDSRFactory;
-- 
cgit v1.2.3-70-g09d2