From ed97aa806cf18f5ac441735f5894ffa8b945bf57 Mon Sep 17 00:00:00 2001
From: annieversary <annnnnie@protonmail.com>
Date: Mon, 11 Oct 2021 23:27:34 +0200
Subject: [PATCH] [cronchy bits] make and implement crate

---
 README.md                      | 17 ++++++
 crates/cronchy_bits/Cargo.toml | 12 +++++
 crates/cronchy_bits/src/lib.rs | 99 ++++++++++++++++++++++++++++++++++
 3 files changed, 128 insertions(+)
 create mode 100644 crates/cronchy_bits/Cargo.toml
 create mode 100644 crates/cronchy_bits/src/lib.rs

diff --git a/README.md b/README.md
index 9e2dded..4a53330 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,7 @@ the following is the current list of plugins
 - `opiate`: spectral morphing between two audio signals
 - `sample - 10/10`: sample rate changer
 - `lotr`: ring modulator
+- `cronchy bits`: gay-forward bit crusher
 
 there's a bit of an explanation of each of the plugins below, but it's not a thorough documentation or a manual, it's just a bunch of notes i've written and a short description of the parameters
 
@@ -343,6 +344,22 @@ ring modulator plugin
 params:
 - `modulation`: controls the modulation ammount. 0 for no modulation, 1 for full modulation
 
+### cronchy bits
+
+bit crusher
+
+params:
+- `cronch`: the ammount of bitcrushing. 1 is extreme crushing, 500 is basically no crushing
+- `kind`: type of rounding to use in the crushing
+
+changing the kind will not affect the tone much, but it's still a nice option to have
+
+there's 4 available kinds:
+- `[0.0, 0.25)`: round
+- `[0.25, 0.5)`: truncate
+- `[0.5, 0.75)`: ceiling
+- `[0.75, 1.0)`: floor
+
 ## 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. if you are fine with that, ig go ahead i'm not your mum
diff --git a/crates/cronchy_bits/Cargo.toml b/crates/cronchy_bits/Cargo.toml
new file mode 100644
index 0000000..1547c4d
--- /dev/null
+++ b/crates/cronchy_bits/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "cronchy_bits"
+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"
+utils = { path = "../utils" }
diff --git a/crates/cronchy_bits/src/lib.rs b/crates/cronchy_bits/src/lib.rs
new file mode 100644
index 0000000..749cfd1
--- /dev/null
+++ b/crates/cronchy_bits/src/lib.rs
@@ -0,0 +1,99 @@
+#![allow(incomplete_features)]
+#![feature(generic_associated_types)]
+
+use baseplug::{Plugin, ProcessContext};
+use serde::{Deserialize, Serialize};
+
+baseplug::model! {
+    #[derive(Debug, Serialize, Deserialize)]
+    struct CronchyBitsModel {
+        #[model(min = 1.0, max = 500.0)]
+        #[parameter(name = "cronch")]
+        cronch: f32,
+        #[model(min = 0.0, max = 1.0)]
+        #[parameter(name = "kind")]
+        kind: f32,
+    }
+}
+
+impl Default for CronchyBitsModel {
+    fn default() -> Self {
+        Self {
+            cronch: 500.0,
+            kind: 0.0,
+        }
+    }
+}
+
+struct CronchyBits;
+
+impl Plugin for CronchyBits {
+    const NAME: &'static str = "cronchy bits";
+    const PRODUCT: &'static str = "cronchy bits";
+    const VENDOR: &'static str = "unnieversal";
+
+    const INPUT_CHANNELS: usize = 2;
+    const OUTPUT_CHANNELS: usize = 2;
+
+    type Model = CronchyBitsModel;
+
+    #[inline]
+    fn new(_sample_rate: f32, _model: &CronchyBitsModel) -> Self {
+        Self
+    }
+
+    #[inline]
+    fn process(&mut self, model: &CronchyBitsModelProcess, ctx: &mut ProcessContext<Self>) {
+        let input = &ctx.inputs[0].buffers;
+        let output = &mut ctx.outputs[0].buffers;
+
+        for i in 0..ctx.nframes {
+            let cronch = model.cronch[i];
+            let cronch_inv = 1.0 / cronch;
+
+            let l = input[0][i];
+            let r = input[1][i];
+
+            match model.kind[0].into() {
+                Kind::Round => {
+                    output[0][i] = l.signum() * (l.abs() * cronch).round() * cronch_inv;
+                    output[1][i] = r.signum() * (r.abs() * cronch).round() * cronch_inv;
+                }
+                Kind::Trunc => {
+                    output[0][i] = l.signum() * (l.abs() * cronch).trunc() * cronch_inv;
+                    output[1][i] = r.signum() * (r.abs() * cronch).trunc() * cronch_inv;
+                }
+                Kind::Ciel => {
+                    output[0][i] = l.signum() * (l.abs() * cronch).ceil() * cronch_inv;
+                    output[1][i] = r.signum() * (r.abs() * cronch).ceil() * cronch_inv;
+                }
+                Kind::Floor => {
+                    output[0][i] = l.signum() * (l.abs() * cronch).floor() * cronch_inv;
+                    output[1][i] = r.signum() * (r.abs() * cronch).floor() * cronch_inv;
+                }
+            }
+        }
+    }
+}
+
+enum Kind {
+    Round,
+    Trunc,
+    Ciel,
+    Floor,
+}
+impl From<f32> for Kind {
+    fn from(v: f32) -> Self {
+        if v < 0.25 {
+            Self::Round
+        } else if v < 0.5 {
+            Self::Trunc
+        } else if v < 0.75 {
+            Self::Ciel
+        } else {
+            Self::Floor
+        }
+    }
+}
+
+baseplug::vst2!(CronchyBits, b"bits");