From e0257dfe3d230e89acb6038c58ea5c5b08f77aef Mon Sep 17 00:00:00 2001
From: minjaesong <alswo9628@gmail.com>
Date: Thu, 23 Nov 2023 20:10:36 +0900
Subject: [PATCH] bitcrusher

---
 .../torvald/terrarum/audio/TerrarumAudioFilter.kt  | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt b/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
index 7f0b27195..d474aca7b 100644
--- a/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
+++ b/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
@@ -5,6 +5,7 @@ import com.jme3.math.FastMath.sin
 import net.torvald.terrarum.audio.AudioMixer.SPEED_OF_SOUND
 import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.BUFFER_SIZE
 import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.SAMPLING_RATEF
+import net.torvald.terrarum.roundToFloat
 import kotlin.math.absoluteValue
 import kotlin.math.roundToInt
 import kotlin.math.tanh
@@ -235,3 +236,16 @@ class BinoPan(var pan: Float, var earDist: Float = 0.18f): TerrarumAudioFilter()
         }
     }
 }
+
+class Bitcrush(var steps: Int, var inputGain: Float = 1f): TerrarumAudioFilter() {
+    override fun thru(inbuf0: List<FloatArray>, inbuf1: List<FloatArray>, outbuf0: List<FloatArray>, outbuf1: List<FloatArray>) {
+        for (ch in 0 until outbuf1.size) {
+            for (i in 0 until BUFFER_SIZE / 4) {
+                val inn = ((inbuf1[ch][i] * inputGain).coerceIn(-1f, 1f) + 1f) / 2f // 0f..1f
+                val stepped = (inn * (steps - 1)).roundToFloat() / (steps - 1)
+                val out = (stepped * 2f) - 1f // -1f..1f
+                outbuf1[ch][i] = out
+            }
+        }
+    }
+}
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