add OPN chip

pretty much copy-paste from YM2610B code

next up: even more blatant copy-paste in 2608

CMakeLists.txt

@@ -345,6 +345,7 @@ src/engine/platform/nes.cpp
 src/engine/platform/c64.cpp
 src/engine/platform/arcade.cpp
 src/engine/platform/tx81z.cpp
+src/engine/platform/ym2203.cpp
 src/engine/platform/ym2610.cpp
 src/engine/platform/ym2610ext.cpp
 src/engine/platform/ym2610b.cpp

src/engine/dispatchContainer.cpp

@@ -29,6 +29,7 @@
 #include "platform/c64.h"
 #include "platform/arcade.h"
 #include "platform/tx81z.h"
+#include "platform/ym2203.h"
 #include "platform/ym2610.h"
 #include "platform/ym2610ext.h"
 #include "platform/ym2610b.h"
@@ -234,6 +235,9 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
     case DIV_SYSTEM_TIA:
       dispatch=new DivPlatformTIA;
       break;
+    case DIV_SYSTEM_OPN:
+      dispatch=new DivPlatformYM2203;
+      break;
     case DIV_SYSTEM_OPLL:
     case DIV_SYSTEM_OPLL_DRUMS:
     case DIV_SYSTEM_VRC7:

src/engine/platform/ym2203.h

@@ -0,0 +1,135 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _YM2203_H
+#define _YM2203_H
+#include "../dispatch.h"
+#include "../macroInt.h"
+#include <queue>
+#include "sound/ymfm/ymfm_opn.h"
+
+#include "ay.h"
+
+class DivYM2203Interface: public ymfm::ymfm_interface {
+
+};
+
+class DivPlatformYM2203: public DivDispatch {
+  protected:
+    const unsigned short chanOffs[6]={
+      0x00, 0x01, 0x02, 0x100, 0x101, 0x102
+    };
+
+    struct Channel {
+      DivInstrumentFM state;
+      unsigned char freqH, freqL;
+      int freq, baseFreq, pitch, pitch2, portaPauseFreq, note, ins;
+      unsigned char psgMode, autoEnvNum, autoEnvDen;
+      signed char konCycles;
+      bool active, insChanged, freqChanged, keyOn, keyOff, portaPause, inPorta, furnacePCM, hardReset;
+      int vol, outVol;
+      int sample;
+      unsigned char pan;
+      DivMacroInt std;
+      void macroInit(DivInstrument* which) {
+        std.init(which);
+        pitch2=0;
+      }
+      Channel():
+        freqH(0),
+        freqL(0),
+        freq(0),
+        baseFreq(0),
+        pitch(0),
+        pitch2(0),
+        portaPauseFreq(0),
+        note(0),
+        ins(-1),
+        psgMode(1),
+        autoEnvNum(0),
+        autoEnvDen(0),
+        active(false),
+        insChanged(true),
+        freqChanged(false),
+        keyOn(false),
+        keyOff(false),
+        portaPause(false),
+        inPorta(false),
+        furnacePCM(false),
+        hardReset(false),
+        vol(0),
+        outVol(15),
+        sample(-1),
+        pan(3) {}
+    };
+    Channel chan[6];
+    DivDispatchOscBuffer* oscBuf[6];
+    bool isMuted[6];
+    struct QueuedWrite {
+      unsigned short addr;
+      unsigned char val;
+      bool addrOrVal;
+      QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v), addrOrVal(false) {}
+    };
+    std::queue<QueuedWrite> writes;
+    ymfm::ym2203* fm;
+    ymfm::ym2203::output_data fmout;
+    DivYM2203Interface iface;
+    unsigned char regPool[512];
+    unsigned char lastBusy;
+  
+    DivPlatformAY8910* ay;
+    unsigned char sampleBank;
+
+    int delay;
+
+    bool extMode;
+  
+    short oldWrites[512];
+    short pendingWrites[512];
+
+    double NOTE_OPN(int ch, int note);
+    friend void putDispatchChan(void*,int,int);
+  
+  public:
+    void acquire(short* bufL, short* bufR, size_t start, size_t len);
+    int dispatch(DivCommand c);
+    void* getChanState(int chan);
+    DivDispatchOscBuffer* getOscBuffer(int chan);
+    unsigned char* getRegisterPool();
+    int getRegisterPoolSize();
+    void reset();
+    void forceIns();
+    void tick(bool sysTick=true);
+    void muteChannel(int ch, bool mute);
+    bool isStereo();
+    bool keyOffAffectsArp(int ch);
+    void notifyInsChange(int ins);
+    void notifyInsDeletion(void* ins);
+    void setSkipRegisterWrites(bool val);
+    void poke(unsigned int addr, unsigned short val);
+    void poke(std::vector<DivRegWrite>& wlist);
+    const char** getRegisterSheet();
+    const char* getEffectName(unsigned char effect);
+    void setFlags(unsigned int flags);
+    int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
+    void quit();
+    ~DivPlatformYM2203();
+};
+#endif

src/engine/platform/ym2203shared.h

@@ -0,0 +1,45 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+static unsigned short opOffs[4]={
+  0x00, 0x04, 0x08, 0x0c
+};
+static bool isOutput[8][4]={
+  // 1     3     2    4
+  {false,false,false,true},
+  {false,false,false,true},
+  {false,false,false,true},
+  {false,false,false,true},
+  {false,false,true ,true},
+  {false,true ,true ,true},
+  {false,true ,true ,true},
+  {true ,true ,true ,true},
+};
+static unsigned char dtTable[8]={
+  7,6,5,0,1,2,3,4
+};
+
+static int orderedOps[4]={
+  0,2,1,3
+};
+
+#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
+#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
+
+#define CHIP_FREQBASE 4720270

src/engine/sysDef.cpp

@@ -1263,7 +1263,10 @@ void DivEngine::registerSystems() {
     {"FM 1", "FM 2", "FM 3", "PSG 1", "PSG 2", "PSG 3"},
     {"F1", "F2", "F3", "S1", "S2", "S3"},
     {DIV_CH_FM, DIV_CH_FM, DIV_CH_FM, DIV_CH_PULSE, DIV_CH_PULSE, DIV_CH_PULSE},
-    {DIV_INS_FM, DIV_INS_FM, DIV_INS_FM, DIV_INS_AY, DIV_INS_AY, DIV_INS_AY}
+    {DIV_INS_FM, DIV_INS_FM, DIV_INS_FM, DIV_INS_AY, DIV_INS_AY, DIV_INS_AY},
+    {},
+    fmHardResetEffectHandler,
+    fmPostEffectHandler
   );
 
   sysDefs[DIV_SYSTEM_PC98]=new DivSysDef(

src/gui/guiConst.cpp

@@ -834,6 +834,8 @@ const int availableSystems[]={
   DIV_SYSTEM_YMU759,
   DIV_SYSTEM_DUMMY,
   DIV_SYSTEM_SOUND_UNIT,
+  DIV_SYSTEM_OPN,
+  DIV_SYSTEM_PC98,
   DIV_SYSTEM_OPLL,
   DIV_SYSTEM_OPLL_DRUMS,
   DIV_SYSTEM_VRC7,

src/gui/presets.cpp

@@ -439,6 +439,12 @@ void FurnaceGUI::initSystemPresets() {
       0
     }
   ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "NEC PC-98 (with PC-9801-26K)", {
+      DIV_SYSTEM_OPN, 64, 0, 3,
+      0
+    }
+  ));
   cat.systems.push_back(FurnaceGUISysDef(
     "ZX Spectrum (48K)", {
       DIV_SYSTEM_AY8910, 64, 0, 2,