From 130ad4451b7af054371992220342a0658b9543d7 Mon Sep 17 00:00:00 2001
From: Felix Roos <flix91@gmail.com>
Date: Sun, 8 Oct 2023 00:30:12 +0200
Subject: [PATCH] add compressor + postgain

---
 packages/core/controls.mjs         |  6 ++++++
 packages/superdough/helpers.mjs    | 11 +++++++++++
 packages/superdough/superdough.mjs | 15 +++++++++++++--
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/packages/core/controls.mjs b/packages/core/controls.mjs
index 88c2c072..832b09dc 100644
--- a/packages/core/controls.mjs
+++ b/packages/core/controls.mjs
@@ -86,6 +86,7 @@ const generic_params = [
    *
    */
   ['gain'],
+  ['postgain'],
   /**
    * Like {@link gain}, but linear.
    *
@@ -1051,6 +1052,11 @@ const generic_params = [
    *
    */
   ['shape'],
+  [['compressor', 'compressorRatio', 'compressorKnee', 'compressorAttack', 'compressorRelease']],
+  ['compressorKnee'],
+  ['compressorRatio'],
+  ['compressorAttack'],
+  ['compressorRelease'],
   /**
    * Changes the speed of sample playback, i.e. a cheap way of changing pitch.
    *
diff --git a/packages/superdough/helpers.mjs b/packages/superdough/helpers.mjs
index 576ec3f1..d87ea94d 100644
--- a/packages/superdough/helpers.mjs
+++ b/packages/superdough/helpers.mjs
@@ -78,6 +78,17 @@ export const getParamADSR = (param, attack, decay, sustain, release, min, max, b
   param.linearRampToValueAtTime(min, end + Math.max(release, 0.1));
 };
 
+export function getCompressor(ac, threshold, ratio, knee, attack, release) {
+  const options = {
+    threshold: threshold ?? -3,
+    ratio: ratio ?? 10,
+    knee: knee ?? 10,
+    attack: attack ?? 0.005,
+    release: release ?? 0.05,
+  };
+  return new DynamicsCompressorNode(ac, options);
+}
+
 export function createFilter(
   context,
   type,
diff --git a/packages/superdough/superdough.mjs b/packages/superdough/superdough.mjs
index 730e495d..410b7b96 100644
--- a/packages/superdough/superdough.mjs
+++ b/packages/superdough/superdough.mjs
@@ -9,7 +9,7 @@ import './reverb.mjs';
 import './vowel.mjs';
 import { clamp } from './util.mjs';
 import workletsUrl from './worklets.mjs?url';
-import { createFilter, gainNode } from './helpers.mjs';
+import { createFilter, gainNode, getCompressor } from './helpers.mjs';
 import { map } from 'nanostores';
 import { logger } from './logger.mjs';
 
@@ -192,6 +192,7 @@ export const superdough = async (value, deadline, hapDuration) => {
     bank,
     source,
     gain = 0.8,
+    postgain = 1,
     // filters
     ftype = '12db',
     fanchor = 0.5,
@@ -237,6 +238,11 @@ export const superdough = async (value, deadline, hapDuration) => {
     velocity = 1,
     analyze, // analyser wet
     fft = 8, // fftSize 0 - 10
+    compressor: compressorThreshold,
+    compressorRatio,
+    compressorKnee,
+    compressorAttack,
+    compressorRelease,
   } = value;
   gain *= velocity; // legacy fix for velocity
   let toDisconnect = []; // audio nodes that will be disconnected when the source has ended
@@ -351,6 +357,11 @@ export const superdough = async (value, deadline, hapDuration) => {
   crush !== undefined && chain.push(getWorklet(ac, 'crush-processor', { crush }));
   shape !== undefined && chain.push(getWorklet(ac, 'shape-processor', { shape }));
 
+  compressorThreshold !== undefined &&
+    chain.push(
+      getCompressor(ac, compressorThreshold, compressorRatio, compressorKnee, compressorAttack, compressorRelease),
+    );
+
   // panning
   if (pan !== undefined) {
     const panner = ac.createStereoPanner();
@@ -359,7 +370,7 @@ export const superdough = async (value, deadline, hapDuration) => {
   }
 
   // last gain
-  const post = gainNode(1);
+  const post = gainNode(postgain);
   chain.push(post);
   post.connect(getDestination());