From 2f9d1e8c0f3fac7f7b8971e4f1d3a7882ddef2b7 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Sun, 6 Mar 2022 18:10:12 -0500
Subject: [PATCH] i'll finish this later

---
 src/engine/platform/opl.cpp | 26 ++++++++++++++++++++++++--
 src/engine/platform/opl.h   |  7 ++++++-
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index bb195a471..ebf7dc927 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -30,7 +30,6 @@
 // N = invalid
 #define N 255
 
-/*
 const unsigned char slotsOPL2[4][20]={
   {0, 1, 2, 6,  7,  8, 12, 13, 14}, // OP1
   {3, 4, 5, 9, 10, 11, 15, 16, 17}, // OP2
@@ -45,6 +44,10 @@ const unsigned char slotsOPL2Drums[4][20]={
   {N, N, N, N,  N,  N,  N,  N,  N,  N,  N}
 };
 
+const unsigned char chanMapOPL2[20]={
+  0, 1, 2, 3, 4, 5, 6, 7, 8, N, N, N, N, N, N, N, N, N, N, N
+};
+
 const unsigned char slotsOPL3[4][20]={
   {0, 6,  1,  7,  2,  8, 18, 24, 19, 25, 20, 26, 30, 31, 32, 12, 13, 14}, // OP1
   {3, 9,  4, 10,  5, 11, 21, 27, 22, 28, 23, 29, 33, 34, 35, 15, 16, 17}, // OP2
@@ -58,7 +61,10 @@ const unsigned char slotsOPL3Drums[4][20]={
   {6, N,  7,  N,  8,  N, 24,  N, 25,  N, 26,  N,  N,  N,  N,  N,  N,  N,  N,  N}, // OP3
   {9, N, 10,  N, 11,  N, 27,  N, 28,  N, 29,  N,  N,  N,  N,  N,  N,  N,  N,  N}  // OP4
 };
-*/
+
+const unsigned char chanMapOPL3[20]={
+  0, 3, 1, 4, 2, 5, 9, 12, 10, 13, 11, 14, 15, 16, 17, 6, 7, 8, N, N
+};
 
 #undef N
 
@@ -773,6 +779,22 @@ void DivPlatformOPL::setYMFM(bool use) {
   useYMFM=use;
 }
 
+void DivPlatformOPL::setOPLType(int type) {
+  switch (type) {
+    case 1: case 2:
+      slotsNonDrums=(const unsigned char**)slotsOPL2;
+      slotsDrums=(const unsigned char**)slotsOPL2Drums;
+      chanMap=chanMapOPL2;
+      break;
+    case 3:
+      slotsNonDrums=(const unsigned char**)slotsOPL3;
+      slotsDrums=(const unsigned char**)slotsOPL3Drums;
+      chanMap=chanMapOPL3;
+      break;
+  }
+  oplType=type;
+}
+
 void DivPlatformOPL::setFlags(unsigned int flags) {
   /*
   if (flags==3) {
diff --git a/src/engine/platform/opl.h b/src/engine/platform/opl.h
index c42481927..ab6226a45 100644
--- a/src/engine/platform/opl.h
+++ b/src/engine/platform/opl.h
@@ -64,7 +64,11 @@ class DivPlatformOPL: public DivDispatch {
     };
     std::queue<QueuedWrite> writes;
     opl3_chip fm;
-    int delay;
+    const unsigned char** slotsNonDrums;
+    const unsigned char** slotsDrums;
+    const unsigned char** slots;
+    const unsigned char* chanMap;
+    int delay, oplType;
     unsigned char lastBusy;
 
     unsigned char regPool[512];
@@ -103,6 +107,7 @@ class DivPlatformOPL: public DivDispatch {
     void muteChannel(int ch, bool mute);
     bool isStereo();
     void setYMFM(bool use);
+    void setOPLType(int type);
     bool keyOffAffectsArp(int ch);
     bool keyOffAffectsPorta(int ch);
     void toggleRegisterDump(bool enable);