From 0f56d9a9c88b7b3bc103315a001e86dbda60c6fc Mon Sep 17 00:00:00 2001
From: annieversary <annnnnie@protonmail.com>
Date: Sun, 25 Jul 2021 11:27:21 +0200
Subject: [PATCH] [tritu] create and implement crate

---
 README.md               | 14 ++++++++
 crates/tritu/Cargo.toml | 11 ++++++
 crates/tritu/src/lib.rs | 75 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 crates/tritu/Cargo.toml
 create mode 100644 crates/tritu/src/lib.rs

diff --git a/README.md b/README.md
index 33d4737..844a385 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ the following is the current list of plugins
 - hysteria: hysteresis nonlinear effect
 - threebandeq: 3 band eq
 - threebandwidth: 3 band stereo widener
+- tritu: say-goodbye-to-your-audio distortion
 
 ### basic_gain
 
@@ -159,6 +160,19 @@ parameters:
 
 bands work as they do in `threebandeq`. the width parameters control how wide an audio signal should be in the stereo field. `width` of 1 leaves the audio as is, `width` of 0 makes it mono, values between 0 and 1 decrease the stereo width, values over 1 increase it.
 
+### tritu
+
+hard limiter followed by a soft limiter with distortion
+
+parameters:
+- `pregain`: pregain for the hard limiter
+- `drive`: drive for the soft limiter
+- `distortion`: amount of distortion on the soft limiter
+
+distortion affects lower volumes more than higher volumes, so if you crank up `drive` a lot, there will be less distortion (this is a good thing for high values of `distortion`!). if you leave `drive` low and set `distortion` to max, your audio will turn to almost white noise
+
+i like this plugin a lot
+
 ## contributing
 
 issues and prs are welcome, but please open an issue before making any big pr, i don't wanna have to reject a pr where you have put a lot of effort on
diff --git a/crates/tritu/Cargo.toml b/crates/tritu/Cargo.toml
new file mode 100644
index 0000000..4e917d2
--- /dev/null
+++ b/crates/tritu/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "tritu"
+version = "0.1.0"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+baseplug = { git = "https://github.com/wrl/baseplug.git", rev = "9cec68f31cca9c0c7a1448379f75d92bbbc782a8" }
+serde = "1.0.126"
diff --git a/crates/tritu/src/lib.rs b/crates/tritu/src/lib.rs
new file mode 100644
index 0000000..702c014
--- /dev/null
+++ b/crates/tritu/src/lib.rs
@@ -0,0 +1,75 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+use baseplug::{Plugin, ProcessContext};
+use serde::{Deserialize, Serialize};
+
+baseplug::model! {
+    #[derive(Debug, Serialize, Deserialize)]
+    struct TrituModel {
+        #[model(min = 1.0, max = 100.0)]
+        #[parameter(name = "pregain")]
+        pregain: f32,
+        #[model(min = 0.0, max = 20.0)]
+        #[parameter(name = "drive")]
+        drive: f32,
+        #[model(min = 0.0, max = 3.0)]
+        #[parameter(name = "distortion")]
+        distortion: f32,
+    }
+}
+
+impl Default for TrituModel {
+    fn default() -> Self {
+        Self {
+            pregain: 1.0,
+            drive: 1.0,
+            distortion: 0.0,
+        }
+    }
+}
+
+struct Tritu;
+
+impl Plugin for Tritu {
+    const NAME: &'static str = "tritu";
+    const PRODUCT: &'static str = "tritu";
+    const VENDOR: &'static str = "unnieversal";
+
+    const INPUT_CHANNELS: usize = 2;
+    const OUTPUT_CHANNELS: usize = 2;
+
+    type Model = TrituModel;
+
+    #[inline]
+    fn new(_sample_rate: f32, _model: &TrituModel) -> Self {
+        Self
+    }
+
+    #[inline]
+    fn process(&mut self, model: &TrituModelProcess, ctx: &mut ProcessContext<Self>) {
+        let input = &ctx.inputs[0].buffers;
+        let output = &mut ctx.outputs[0].buffers;
+
+        for i in 0..ctx.nframes {
+            let pregain = model.pregain[i];
+            let drive = model.drive[i];
+            let distortion = model.distortion[i];
+
+            output[0][i] = trituradora(input[0][i], pregain, drive, distortion);
+            output[1][i] = trituradora(input[1][i], pregain, drive, distortion);
+        }
+    }
+}
+
+fn trituradora(input: f32, pregain: f32, drive: f32, distortion: f32) -> f32 {
+    // multiply by pregain and hard clip
+    let hard = (input * pregain).clamp(-1.0, 1.0);
+    // multiply by drive
+    let val = hard * drive;
+
+    // weird thingy i made up: https://www.desmos.com/calculator/bzprjqhudd
+    val.tanh() * (distortion / val).cos()
+}
+
+baseplug::vst2!(Tritu, b"tri2");