From 0c727ff6b761ecf03afafed8e3510c5cc0335216 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Sat, 25 Nov 2023 18:02:21 -0500
Subject: [PATCH] YM2612: YMF276-LLE, part 1

---
 CMakeLists.txt                  |  1 +
 src/engine/platform/genesis.cpp | 16 ++++++++++++----
 src/engine/platform/genesis.h   |  9 ++++++---
 src/gui/settings.cpp            | 11 ++++++-----
 4 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 20e6cf507..4b8a94787 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -491,6 +491,7 @@ extern/Nuked-OPLL/opll.c
 extern/opl/opl3.c
 extern/YM3812-LLE/fmopl2.c
 extern/YMF262-LLE/fmopl3.c
+extern/YMF276-LLE/fmopn2.c
 
 src/pch.cpp
 
diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 4973a323d..633bf2886 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -289,8 +289,14 @@ void DivPlatformGenesis::acquire_ymfm(short** buf, size_t len) {
   }
 }
 
+void DivPlatformGenesis::acquire_nuked276(short** buf, size_t len) {
+  // TODO
+}
+
 void DivPlatformGenesis::acquire(short** buf, size_t len) {
-  if (useYMFM) {
+  if (useYMFM==2) {
+    acquire_nuked276(buf,len);
+  } else if (useYMFM==1) {
     acquire_ymfm(buf,len);
   } else {
     acquire_nuked(buf,len);
@@ -1309,7 +1315,9 @@ float DivPlatformGenesis::getPostAmp() {
 void DivPlatformGenesis::reset() {
   writes.clear();
   memset(regPool,0,512);
-  if (useYMFM) {
+  if (useYMFM==2) {
+    memset(&fm_276,0,sizeof(fmopn2_t));
+  } else if (useYMFM==1) {
     fm_ymfm->reset();
   }
   OPN2_Reset(&fm);
@@ -1396,7 +1404,7 @@ int DivPlatformGenesis::getPortaFloor(int ch) {
   return 0;
 }
 
-void DivPlatformGenesis::setYMFM(bool use) {
+void DivPlatformGenesis::setYMFM(unsigned char use) {
   useYMFM=use;
 }
 
@@ -1441,7 +1449,7 @@ void DivPlatformGenesis::setFlags(const DivConfig& flags) {
       break;
   }
   CHECK_CUSTOM_CLOCK;
-  if (useYMFM) {
+  if (useYMFM==1) {
     if (fm_ymfm!=NULL) delete fm_ymfm;
     if (chipType==1) {
       fm_ymfm=new ymfm::ym2612(iface);
diff --git a/src/engine/platform/genesis.h b/src/engine/platform/genesis.h
index 8c9181dc9..82d4301b9 100644
--- a/src/engine/platform/genesis.h
+++ b/src/engine/platform/genesis.h
@@ -22,7 +22,7 @@
 
 #include "fmshared_OPN.h"
 #include "sound/ymfm/ymfm_opn.h"
-
+#include "../../../extern/YMF276-LLE/fmopn2.h"
 
 class DivYM2612Interface: public ymfm::ymfm_interface {
   int setA, setB;
@@ -77,6 +77,7 @@ class DivPlatformGenesis: public DivPlatformOPN {
     DivDispatchOscBuffer* oscBuf[10];
     bool isMuted[10];
     ym3438_t fm;
+    fmopn2_t fm_276;
 
     ymfm::ym2612* fm_ymfm;
     ymfm::ym2612::output_data out_ymfm;
@@ -84,7 +85,8 @@ class DivPlatformGenesis: public DivPlatformOPN {
 
     int softPCMTimer;
 
-    bool extMode, softPCM, noExtMacros, useYMFM, canWriteDAC;
+    bool extMode, softPCM, noExtMacros, canWriteDAC;
+    unsigned char useYMFM;
     unsigned char chipType;
     short dacWrite;
   
@@ -96,6 +98,7 @@ class DivPlatformGenesis: public DivPlatformOPN {
     inline void processDAC(int iRate);
     inline void commitState(int ch, DivInstrument* ins);
     void acquire_nuked(short** buf, size_t len);
+    void acquire_nuked276(short** buf, size_t len);
     void acquire_ymfm(short** buf, size_t len);
   
     friend void putDispatchChip(void*,int);
@@ -116,7 +119,7 @@ class DivPlatformGenesis: public DivPlatformOPN {
     void tick(bool sysTick=true);
     void muteChannel(int ch, bool mute);
     int getOutputCount();
-    void setYMFM(bool use);
+    void setYMFM(unsigned char use);
     bool keyOffAffectsArp(int ch);
     bool keyOffAffectsPorta(int ch);
     float getPostAmp();
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index c7ff6b29b..154b87331 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -127,7 +127,8 @@ const char* arcadeCores[]={
 
 const char* ym2612Cores[]={
   "Nuked-OPN2",
-  "ymfm"
+  "ymfm",
+  "YMF276-LLE"
 };
 
 const char* snCores[]={
@@ -1499,10 +1500,10 @@ void FurnaceGUI::drawSettings() {
           ImGui::Text("YM2612");
           ImGui::TableNextColumn();
           ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
-          if (ImGui::Combo("##YM2612Core",&settings.ym2612Core,ym2612Cores,2)) settingsChanged=true;
+          if (ImGui::Combo("##YM2612Core",&settings.ym2612Core,ym2612Cores,3)) settingsChanged=true;
           ImGui::TableNextColumn();
           ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
-          if (ImGui::Combo("##YM2612CoreRender",&settings.ym2612CoreRender,ym2612Cores,2)) settingsChanged=true;
+          if (ImGui::Combo("##YM2612CoreRender",&settings.ym2612CoreRender,ym2612Cores,3)) settingsChanged=true;
 
           ImGui::TableNextRow();
           ImGui::TableNextColumn();
@@ -3810,7 +3811,7 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.audioRate,8000,384000);
   clampSetting(settings.audioChans,1,16);
   clampSetting(settings.arcadeCore,0,1);
-  clampSetting(settings.ym2612Core,0,1);
+  clampSetting(settings.ym2612Core,0,2);
   clampSetting(settings.snCore,0,1);
   clampSetting(settings.nesCore,0,1);
   clampSetting(settings.fdsCore,0,1);
@@ -3820,7 +3821,7 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.opl2Core,0,2);
   clampSetting(settings.opl3Core,0,2);
   clampSetting(settings.arcadeCoreRender,0,1);
-  clampSetting(settings.ym2612CoreRender,0,1);
+  clampSetting(settings.ym2612CoreRender,0,2);
   clampSetting(settings.snCoreRender,0,1);
   clampSetting(settings.nesCoreRender,0,1);
   clampSetting(settings.fdsCoreRender,0,1);