From 36513259402083600b20381adc2926a10b1714ef Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Mon, 6 Mar 2023 04:21:10 -0500
Subject: [PATCH] SN: register view?

---
 src/engine/platform/sms.cpp | 33 +++++++++++++++++++++++++++++++++
 src/engine/platform/sms.h   |  5 +++++
 2 files changed, 38 insertions(+)

diff --git a/src/engine/platform/sms.cpp b/src/engine/platform/sms.cpp
index 518dd6e7..f8858aab 100644
--- a/src/engine/platform/sms.cpp
+++ b/src/engine/platform/sms.cpp
@@ -43,6 +43,23 @@ float DivPlatformSMS::getPostAmp() {
   return 1.5f;
 }
 
+void DivPlatformSMS::poolWrite(unsigned short a, unsigned char v) {
+  if (a) {
+    regPool[9]=v;
+  } else {
+    if (v>=0x80) {
+      regPool[(v>>4)&7]&=~15;
+      regPool[(v>>4)&7]|=v&15;
+      chanLatch=(v>>5)&3;
+    } else {
+      regPool[chanLatch<<1]&=15;
+      regPool[chanLatch<<1]|=((v&15)<<4);
+      regPool[1+(chanLatch<<1)]&=15;
+      regPool[1+(chanLatch<<1)]|=v&0xf0;
+    }
+  }
+}
+
 void DivPlatformSMS::acquire_nuked(short** buf, size_t len) {
   int oL=0;
   int oR=0;
@@ -54,6 +71,9 @@ void DivPlatformSMS::acquire_nuked(short** buf, size_t len) {
       } else if (w.addr==1) {
         YMPSG_WriteStereo(&sn_nuked,w.val);
       }
+
+      poolWrite(w.addr,w.val);
+
       writes.pop();
     }
     YMPSG_Clock(&sn_nuked);
@@ -97,6 +117,9 @@ void DivPlatformSMS::acquire_mame(short** buf, size_t len) {
     else if (w.addr==0) {
       sn->write(w.val);
     }
+
+    poolWrite(w.addr,w.val);
+
     writes.pop();
   }
   for (size_t h=0; h<len; h++) {
@@ -428,7 +451,17 @@ DivDispatchOscBuffer* DivPlatformSMS::getOscBuffer(int ch) {
   return oscBuf[ch];
 }
 
+unsigned char* DivPlatformSMS::getRegisterPool() {
+  return regPool;
+}
+
+int DivPlatformSMS::getRegisterPoolSize() {
+  return stereo?9:8;
+}
+
 void DivPlatformSMS::reset() {
+  memset(regPool,0,16);
+  chanLatch=0;
   while (!writes.empty()) writes.pop();
   for (int i=0; i<4; i++) {
     chan[i]=DivPlatformSMS::Channel();
diff --git a/src/engine/platform/sms.h b/src/engine/platform/sms.h
index a8bb42d6..efdfff44 100644
--- a/src/engine/platform/sms.h
+++ b/src/engine/platform/sms.h
@@ -42,6 +42,8 @@ class DivPlatformSMS: public DivDispatch {
   unsigned char lastPan;
   unsigned char oldValue; 
   unsigned char snNoiseMode;
+  unsigned char regPool[16];
+  unsigned char chanLatch;
   int divider=16;
   double toneDivider=64.0;
   double noiseDivider=64.0;
@@ -65,6 +67,7 @@ class DivPlatformSMS: public DivDispatch {
 
   double NOTE_SN(int ch, int note);
   int snCalcFreq(int ch);
+  void poolWrite(unsigned short a, unsigned char v);
 
   void acquire_nuked(short** buf, size_t len);
   void acquire_mame(short** buf, size_t len);
@@ -74,6 +77,8 @@ class DivPlatformSMS: public DivDispatch {
     void* getChanState(int chan);
     DivMacroInt* getChanMacroInt(int ch);
     DivDispatchOscBuffer* getOscBuffer(int chan);
+    unsigned char* getRegisterPool();
+    int getRegisterPoolSize();
     void reset();
     void forceIns();
     void tick(bool sysTick=true);