From e4ad569f8d097d8afef9f1bb47e8d6ea9e724250 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Thu, 24 Feb 2022 16:53:20 -0500
Subject: [PATCH] Lynx: fix stereo

---
 src/engine/platform/lynx.cpp | 35 +++++++++++++++++++++--------------
 src/engine/platform/lynx.h   |  4 +++-
 2 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/src/engine/platform/lynx.cpp b/src/engine/platform/lynx.cpp
index eee2b2e2..856950f9 100644
--- a/src/engine/platform/lynx.cpp
+++ b/src/engine/platform/lynx.cpp
@@ -30,6 +30,7 @@
 #define WRITE_CONTROL(ch,v) rWrite(0x25+(ch<<3),(v))
 #define WRITE_OTHER(ch,v) rWrite(0x27+(ch<<3),(v))
 #define WRITE_ATTEN(ch,v) rWrite((0x40+ch),(v))
+#define WRITE_STEREO(v) rWrite(0x50,(v))
 
 #define CHIP_DIVIDER 64
 
@@ -88,9 +89,9 @@ const char* regCheatSheetLynx[]={
 
 const char** DivPlatformLynx::getRegisterSheet() {
   return regCheatSheetLynx;
-}
-
-const char* DivPlatformLynx::getEffectName(unsigned char effect) {
+}
+
+const char* DivPlatformLynx::getEffectName(unsigned char effect) {
   switch (effect)
   {
   case 0x30: case 0x31: case 0x32: case 0x33:
@@ -197,7 +198,8 @@ int DivPlatformLynx::dispatch(DivCommand c) {
       }
       break;
     case DIV_CMD_PANNING:
-      WRITE_ATTEN(c.chan, c.value);
+      chan[c.chan].pan=((c.value&0x0f)<<4)|((c.value&0xf0)>>4);
+      WRITE_ATTEN(c.chan,chan[c.chan].pan);
       break;
     case DIV_CMD_GET_VOLUME:
       if (chan[c.chan].std.hasVol) {
@@ -261,6 +263,10 @@ void DivPlatformLynx::muteChannel(int ch, bool mute) {
   if (chan[ch].active) WRITE_VOLUME(ch,(isMuted[ch]?0:(chan[ch].outVol&127)));
 }
 
+bool DivPlatformLynx::isStereo() {
+  return true;
+}
+
 void DivPlatformLynx::forceIns() {
   for (int i=0; i<4; i++) {
     if (chan[i].active) {
@@ -272,16 +278,16 @@ void DivPlatformLynx::forceIns() {
 
 void* DivPlatformLynx::getChanState(int ch) {
   return &chan[ch];
-}
-
-unsigned char* DivPlatformLynx::getRegisterPool()
-{
-  return const_cast<unsigned char*>( mikey->getRegisterPool() );
-}
-
-int DivPlatformLynx::getRegisterPoolSize()
-{
-  return 4*8+4;
+}
+
+unsigned char* DivPlatformLynx::getRegisterPool()
+{
+  return const_cast<unsigned char*>( mikey->getRegisterPool() );
+}
+
+int DivPlatformLynx::getRegisterPoolSize()
+{
+  return 4*8+4;
 }
 
 void DivPlatformLynx::reset() {
@@ -294,6 +300,7 @@ void DivPlatformLynx::reset() {
   if (dumpWrites) {
     addWrite(0xffffffff,0);
   }
+  WRITE_STEREO(0);
 }
 
 bool DivPlatformLynx::keyOffAffectsArp(int ch) {
diff --git a/src/engine/platform/lynx.h b/src/engine/platform/lynx.h
index 8ad2bf2c..536a874a 100644
--- a/src/engine/platform/lynx.h
+++ b/src/engine/platform/lynx.h
@@ -45,7 +45,7 @@ class DivPlatformLynx: public DivDispatch {
     MikeyFreqDiv fd;
     MikeyDuty duty;
     int baseFreq, pitch, note, actualNote, lfsr;
-    unsigned char ins;
+    unsigned char ins, pan;
     bool active, insChanged, freqChanged, keyOn, keyOff, inPorta;
     signed char vol, outVol;
     Channel():
@@ -58,6 +58,7 @@ class DivPlatformLynx: public DivDispatch {
       actualNote(0),
       lfsr(-1),
       ins(-1),
+      pan(0xff),
       active(false),
       insChanged(true),
       freqChanged(false),
@@ -81,6 +82,7 @@ class DivPlatformLynx: public DivDispatch {
     void forceIns();
     void tick();
     void muteChannel(int ch, bool mute);
+    bool isStereo();
     bool keyOffAffectsArp(int ch);
     bool keyOffAffectsPorta(int ch);
     //int getPortaFloor(int ch);