From 8fd26289a2d4dca65388e857712aa6d0f6d37866 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Thu, 16 Mar 2023 05:27:43 -0500
Subject: [PATCH] Namco WSG: add ROM mode

---
 src/engine/platform/namcowsg.cpp | 36 +++++++++++++++++++++++++++-----
 src/engine/platform/namcowsg.h   |  2 ++
 src/engine/waveSynth.cpp         |  2 ++
 src/gui/sysConf.cpp              | 25 ++++++++++++++++++----
 4 files changed, 56 insertions(+), 9 deletions(-)

diff --git a/src/engine/platform/namcowsg.cpp b/src/engine/platform/namcowsg.cpp
index 10eb3453..0fe2ccd3 100644
--- a/src/engine/platform/namcowsg.cpp
+++ b/src/engine/platform/namcowsg.cpp
@@ -183,6 +183,7 @@ void DivPlatformNamcoWSG::acquire(short** buf, size_t len) {
 }
 
 void DivPlatformNamcoWSG::updateWave(int ch) {
+  if (romMode) return;
   if (devType==30) {
     for (int i=0; i<32; i++) {
       ((namco_cus30_device*)namco)->namcos1_cus30_w(i+ch*32,chan[ch].ws.output[i]);
@@ -291,9 +292,9 @@ void DivPlatformNamcoWSG::tick(bool sysTick) {
       rWrite(0x1d,(chan[2].freq>>12)&15);
       rWrite(0x1e,(chan[2].freq>>16)&15);
 
-      rWrite(0x05,0);
-      rWrite(0x0a,1);
-      rWrite(0x0f,2);
+      rWrite(0x05,romMode?(chan[0].wave&7):0);
+      rWrite(0x0a,romMode?(chan[1].wave&7):1);
+      rWrite(0x0f,romMode?(chan[2].wave&7):2);
       break;
     case 15:
       for (int i=0; i<8; i++) {
@@ -304,7 +305,7 @@ void DivPlatformNamcoWSG::tick(bool sysTick) {
         }
         rWrite((i<<3)+0x04,chan[i].freq&0xff);
         rWrite((i<<3)+0x05,(chan[i].freq>>8)&0xff);
-        rWrite((i<<3)+0x06,((chan[i].freq>>16)&15)|(i<<4));
+        rWrite((i<<3)+0x06,((chan[i].freq>>16)&15)|((romMode?(chan[i].wave&7):i)<<4));
       }
       break;
     case 30:
@@ -496,10 +497,11 @@ void DivPlatformNamcoWSG::reset() {
   if (dumpWrites) {
     addWrite(0xffffffff,0);
   }
-  // TODO: wave memory
   namco->set_voices(chans);
   namco->set_stereo((devType==2 || devType==30));
   namco->device_start(NULL);
+
+  updateROMWaves();
 }
 
 int DivPlatformNamcoWSG::getOutputCount() {
@@ -510,6 +512,27 @@ bool DivPlatformNamcoWSG::keyOffAffectsArp(int ch) {
   return true;
 }
 
+void DivPlatformNamcoWSG::updateROMWaves() {
+  if (romMode) {
+    // copy wavetables
+    for (int i=0; i<8; i++) {
+      int data=0;
+      DivWavetable* w=parent->getWave(i);
+
+      for (int j=0; j<32; j++) {
+        if (w->max<1 || w->len<1) {
+          data=0;
+        } else {
+          data=w->data[j*w->len/32]*15/w->max;
+          if (data<0) data=0;
+          if (data>15) data=15;
+        }
+        namco->update_namco_waveform(i*32+j,data);
+      }
+    }
+  }
+}
+
 void DivPlatformNamcoWSG::notifyWaveChange(int wave) {
   for (int i=0; i<chans; i++) {
     if (chan[i].wave==wave) {
@@ -517,6 +540,7 @@ void DivPlatformNamcoWSG::notifyWaveChange(int wave) {
       updateWave(i);
     }
   }
+  updateROMWaves();
 }
 
 void DivPlatformNamcoWSG::notifyInsDeletion(void* ins) {
@@ -552,6 +576,8 @@ void DivPlatformNamcoWSG::setFlags(const DivConfig& flags) {
     oscBuf[i]->rate=rate;
   }
   newNoise=flags.getBool("newNoise",true);
+  romMode=flags.getBool("romMode",true);
+  if (devType==30) romMode=false;
 }
 
 void DivPlatformNamcoWSG::poke(unsigned int addr, unsigned short val) {
diff --git a/src/engine/platform/namcowsg.h b/src/engine/platform/namcowsg.h
index dcc52549..9d418a9d 100644
--- a/src/engine/platform/namcowsg.h
+++ b/src/engine/platform/namcowsg.h
@@ -50,8 +50,10 @@ class DivPlatformNamcoWSG: public DivDispatch {
   namco_audio_device* namco;
   int devType, chans;
   bool newNoise;
+  bool romMode;
   unsigned char regPool[512];
   void updateWave(int ch);
+  void updateROMWaves();
   friend void putDispatchChip(void*,int);
   friend void putDispatchChan(void*,int,int);
   public:
diff --git a/src/engine/waveSynth.cpp b/src/engine/waveSynth.cpp
index 757c2c7e..caa7294b 100644
--- a/src/engine/waveSynth.cpp
+++ b/src/engine/waveSynth.cpp
@@ -20,6 +20,7 @@
 #include "waveSynth.h"
 #include "engine.h"
 #include "instrument.h"
+#include "../ta-log.h"
 
 bool DivWaveSynth::activeChanged() {
   if (activeChangedB) {
@@ -211,6 +212,7 @@ void DivWaveSynth::setWidth(int val) {
 
 void DivWaveSynth::changeWave1(int num) {
   DivWavetable* w1=e->getWave(num);
+  logV("changeWave1 (%d)",width);
   if (width<1) return;
   for (int i=0; i<width; i++) {
     if (w1->max<1 || w1->len<1) {
diff --git a/src/gui/sysConf.cpp b/src/gui/sysConf.cpp
index 3650d1b9..cf23857e 100644
--- a/src/gui/sysConf.cpp
+++ b/src/gui/sysConf.cpp
@@ -1735,6 +1735,27 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
       }
       break;
     }
+    case DIV_SYSTEM_NAMCO:
+    case DIV_SYSTEM_NAMCO_15XX: {
+      bool romMode=flags.getBool("romMode",false);
+
+      ImGui::Text("Waveform storage mode:");
+      if (ImGui::RadioButton("RAM",!romMode)) {
+        romMode=false;
+        altered=true;
+      }
+      if (ImGui::RadioButton("ROM (up to 8 waves)",romMode)) {
+        romMode=true;
+        altered=true;
+      }
+
+      if (altered) {
+        e->lockSave([&]() {
+          flags.set("romMode",romMode);
+        });
+      }
+      break;
+    }
     case DIV_SYSTEM_NAMCO_CUS30: {
       bool newNoise=flags.getBool("newNoise",true);
 
@@ -1769,10 +1790,6 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
     case DIV_SYSTEM_VBOY:
     case DIV_SYSTEM_GA20:
     case DIV_SYSTEM_PV1000:
-    case DIV_SYSTEM_NAMCO:
-    case DIV_SYSTEM_NAMCO_15XX:
-      ImGui::Text("nothing to configure");
-      break;
     case DIV_SYSTEM_VERA:
     case DIV_SYSTEM_YMU759:
       supportsCustomRate=false;