From 659a16a489c7f133a16fc56d3dbff25b20dc913d Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Wed, 5 Feb 2025 04:10:16 -0500
Subject: [PATCH] C64: PCM chan osc, part 2

issue #2349
---
 src/engine/dispatchContainer.cpp |  2 ++
 src/engine/platform/c64.cpp      | 12 ++++++++++--
 src/engine/platform/c64.h        |  3 ++-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/engine/dispatchContainer.cpp b/src/engine/dispatchContainer.cpp
index e4e21da69..fa39aec22 100644
--- a/src/engine/dispatchContainer.cpp
+++ b/src/engine/dispatchContainer.cpp
@@ -339,6 +339,7 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
         ((DivPlatformC64*)dispatch)->setCoreQuality(eng->getConfInt("dsidQuality",3));
       }
       ((DivPlatformC64*)dispatch)->setChipModel(true);
+      ((DivPlatformC64*)dispatch)->setSoftPCM(sys==DIV_SYSTEM_C64_PCM);
       break;
     case DIV_SYSTEM_C64_8580:
       dispatch=new DivPlatformC64;
@@ -350,6 +351,7 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
         ((DivPlatformC64*)dispatch)->setCoreQuality(eng->getConfInt("dsidQuality",3));
       }
       ((DivPlatformC64*)dispatch)->setChipModel(false);
+      ((DivPlatformC64*)dispatch)->setSoftPCM(false);
       break;
     case DIV_SYSTEM_YM2151:
       dispatch=new DivPlatformArcade;
diff --git a/src/engine/platform/c64.cpp b/src/engine/platform/c64.cpp
index 2c0205501..4ea8b6e62 100644
--- a/src/engine/platform/c64.cpp
+++ b/src/engine/platform/c64.cpp
@@ -69,7 +69,9 @@ short DivPlatformC64::runFakeFilter(unsigned char ch, int in) {
   if (!(regPool[0x17]&(1<<ch))) {
     if (regPool[0x18]&0x80 && ch==2) return 0;
     float fin=in;
-    fin*=(float)(regPool[0x18]&15)/20.0f;
+    if (noSoftPCM) {
+      fin*=(float)(regPool[0x18]&15)/20.0f;
+    }
     return CLAMP(fin,-32768,32767);
   }
 
@@ -96,7 +98,9 @@ short DivPlatformC64::runFakeFilter(unsigned char ch, int in) {
     fout+=tmp;
   }
 
-  fout*=(float)(regPool[0x18]&15)/20.0f;
+  if (noSoftPCM) {
+    fout*=(float)(regPool[0x18]&15)/20.0f;
+  }
   return CLAMP(fout,-32768,32767);
 }
 
@@ -969,6 +973,10 @@ void DivPlatformC64::setCoreQuality(unsigned char q) {
   }
 }
 
+void DivPlatformC64::setSoftPCM(bool isSoft) {
+  noSoftPCM=!isSoft;
+}
+
 int DivPlatformC64::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
   parent=p;
   dumpWrites=false;
diff --git a/src/engine/platform/c64.h b/src/engine/platform/c64.h
index aed241052..5d4474346 100644
--- a/src/engine/platform/c64.h
+++ b/src/engine/platform/c64.h
@@ -91,7 +91,7 @@ class DivPlatformC64: public DivDispatch {
   int pcmCycle, lineRate;
   short cutoff_slide;
 
-  bool keyPriority, sidIs6581, needInitTables, no1EUpdate, multiplyRel, macroRace;
+  bool keyPriority, sidIs6581, needInitTables, no1EUpdate, multiplyRel, macroRace, noSoftPCM;
   unsigned char chanOrder[3];
   unsigned char testAD, testSR;
 
@@ -140,6 +140,7 @@ class DivPlatformC64: public DivDispatch {
     void setChipModel(bool is6581);
     void setCore(unsigned char which);
     void setCoreQuality(unsigned char q);
+    void setSoftPCM(bool isSoft);
     void quit();
     ~DivPlatformC64();
 };