From 9485c74961c1e9fd0347353874cf92b7e09a2868 Mon Sep 17 00:00:00 2001
From: Chris <chris@ternar.tech>
Date: Mon, 30 Sep 2024 07:03:51 +0200
Subject: [PATCH] add wavefolder

---
 clip/wavefolder.h   | 38 ++++++++++++++++++++++++++++++++++++++
 synth/tx_operator.h |  6 ++++--
 2 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 clip/wavefolder.h

diff --git a/clip/wavefolder.h b/clip/wavefolder.h
new file mode 100644
index 0000000..ec8b520
--- /dev/null
+++ b/clip/wavefolder.h
@@ -0,0 +1,38 @@
+#pragma once
+
+namespace trnr {
+class wavefolder {
+public:
+	float amount = 1.f;
+
+	float process_sample(float& _sample)
+	{
+		if (amount > 1.f) { return fold(_sample * amount); }
+
+        return 0.f;
+	}
+
+private:
+	float fold(float _sample)
+	{
+		// fold positive values
+		if (_sample > 1.0) {
+			_sample = 2.0 - _sample;
+
+			if (_sample < 0.0) { _sample = -_sample; }
+
+			return fold(_sample);
+		}
+		// fold negative values
+		else if (_sample < -1.0) {
+			_sample = -2.0 - _sample;
+
+			if (_sample > 0.0) { _sample = -_sample; }
+
+			return fold(_sample);
+		} else {
+			return _sample;
+		}
+	}
+};
+}; // namespace trnr
\ No newline at end of file
diff --git a/synth/tx_operator.h b/synth/tx_operator.h
index a9ee86e..de06d0a 100644
--- a/synth/tx_operator.h
+++ b/synth/tx_operator.h
@@ -1,6 +1,7 @@
 #pragma once
 #include "tx_envelope.h"
 #include "tx_sineosc.h"
+#include "../clip/wavefolder.h"
 
 namespace trnr {
 class tx_operator {
@@ -13,18 +14,19 @@ public:
 
 	tx_envelope envelope;
 	tx_sineosc oscillator;
+	wavefolder wavefolding;
 	float ratio;
 	float amplitude;
 
 	float process_sample(const bool& gate, const bool& trigger, const float& frequency, const float& velocity,
 						 const float& pm = 0)
 	{
-
 		float env = envelope.process_sample(gate, trigger);
 
 		// drifts and sounds better!
 		if (envelope.is_busy()) {
-			double osc = oscillator.process_sample(trigger, frequency, pm);
+			float osc = oscillator.process_sample(trigger, frequency, pm);
+			osc = wavefolding.process_sample(osc);
 			return osc * env * velocity;
 		} else {
 			return 0.;