From 09e457003b31907a2e4047b3794cf3827420569c Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Mon, 25 Jul 2022 18:41:47 -0500
Subject: [PATCH] add option for soft-clipping

---
 src/engine/engine.cpp   | 1 +
 src/engine/engine.h     | 1 +
 src/engine/playback.cpp | 8 ++++++++
 src/gui/gui.h           | 2 ++
 src/gui/settings.cpp    | 8 ++++++++
 5 files changed, 20 insertions(+)

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 98947ead3..40a51bdc2 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -2996,6 +2996,7 @@ bool DivEngine::initAudioBackend() {
 
   lowQuality=getConfInt("audioQuality",0);
   forceMono=getConfInt("forceMono",0);
+  clampSamples=getConfInt("clampSamples",0);
   lowLatency=getConfInt("lowLatency",0);
   metroVol=(float)(getConfInt("metroVol",100))/100.0f;
   if (metroVol<0.0f) metroVol=0.0f;
diff --git a/src/engine/engine.h b/src/engine/engine.h
index b5c158058..482b58dcb 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -298,6 +298,7 @@ class DivEngine {
   bool stopExport;
   bool halted;
   bool forceMono;
+  bool clampSamples;
   bool cmdStreamEnabled;
   bool softLocked;
   bool firstTick;
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index e9d5aa952..662e2ddb4 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -1413,6 +1413,14 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
       out[1][i]=out[0][i];
     }
   }
+  if (clampSamples) {
+    for (size_t i=0; i<size; i++) {
+      if (out[0][i]<-1.0) out[0][i]=-1.0;
+      if (out[0][i]>1.0) out[0][i]=1.0;
+      if (out[1][i]<-1.0) out[1][i]=-1.0;
+      if (out[1][i]>1.0) out[1][i]=1.0;
+    }
+  }
   isBusy.unlock();
 
   std::chrono::steady_clock::time_point ts_processEnd=std::chrono::steady_clock::now();
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 8fcf38b30..875501d24 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1094,6 +1094,7 @@ class FurnaceGUI {
     int dragMovesSelection;
     int unsignedDetune;
     int noThreadedInput;
+    int clampSamples;
     unsigned int maxUndoSteps;
     String mainFontPath;
     String patFontPath;
@@ -1199,6 +1200,7 @@ class FurnaceGUI {
       dragMovesSelection(1),
       unsignedDetune(0),
       noThreadedInput(0),
+      clampSamples(0),
       maxUndoSteps(100),
       mainFontPath(""),
       patFontPath(""),
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index f67671194..eae165d27 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -659,6 +659,11 @@ void FurnaceGUI::drawSettings() {
             settings.forceMono=forceMonoB;
           }
 
+          bool clampSamplesB=settings.clampSamples;
+          if (ImGui::Checkbox("Software clipping",&clampSamplesB)) {
+            settings.clampSamples=clampSamplesB;
+          }
+
           TAAudioDesc& audioWant=e->getAudioDescWant();
           TAAudioDesc& audioGot=e->getAudioDescGot();
 
@@ -2118,6 +2123,7 @@ void FurnaceGUI::syncSettings() {
   settings.unsignedDetune=e->getConfInt("unsignedDetune",0);
   settings.noThreadedInput=e->getConfInt("noThreadedInput",0);
   settings.initialSysName=e->getConfString("initialSysName","");
+  settings.clampSamples=e->getConfInt("clampSamples",0);
 
   clampSetting(settings.mainFontSize,2,96);
   clampSetting(settings.patFontSize,2,96);
@@ -2205,6 +2211,7 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.dragMovesSelection,0,2);
   clampSetting(settings.unsignedDetune,0,1);
   clampSetting(settings.noThreadedInput,0,1);
+  clampSetting(settings.clampSamples,0,1);
 
   settings.initialSys=e->decodeSysDesc(e->getConfString("initialSys",""));
   if (settings.initialSys.size()<4) {
@@ -2343,6 +2350,7 @@ void FurnaceGUI::commitSettings() {
   e->setConf("dragMovesSelection",settings.dragMovesSelection);
   e->setConf("unsignedDetune",settings.unsignedDetune);
   e->setConf("noThreadedInput",settings.noThreadedInput);
+  e->setConf("clampSamples",settings.clampSamples);
 
   // colors
   for (int i=0; i<GUI_COLOR_MAX; i++) {