From b35235b82e92190501b48b5886d3418d3de38f77 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Mon, 21 Aug 2023 22:41:35 -0500
Subject: [PATCH] GUI: OPZ preview

it's complete
---
 src/gui/fmPreview.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++
 src/gui/gui.cpp       |  1 +
 src/gui/gui.h         |  1 +
 3 files changed, 54 insertions(+)

diff --git a/src/gui/fmPreview.cpp b/src/gui/fmPreview.cpp
index b8359312c..5586d1c20 100644
--- a/src/gui/fmPreview.cpp
+++ b/src/gui/fmPreview.cpp
@@ -282,7 +282,59 @@ void FurnaceGUI::renderFMPreviewOPL(const DivInstrumentFM& params, int pos) {
   }
 }
 
+#define OPZ_WRITE(addr,val) \
+  ((ymfm::ym2414*)fmPreviewOPZ)->write(0,(addr)); \
+  ((ymfm::ym2414*)fmPreviewOPZ)->write(1,(val)); \
+  ((ymfm::ym2414*)fmPreviewOPZ)->generate(&out,1);
+
 void FurnaceGUI::renderFMPreviewOPZ(const DivInstrumentFM& params, int pos) {
+  if (fmPreviewOPZ==NULL) {
+    fmPreviewOPZInterface=new ymfm::ymfm_interface();
+    fmPreviewOPZ=new ymfm::ym2414(*(ymfm::ymfm_interface*)fmPreviewOPZInterface);
+    pos=0;
+  }
+  ymfm::ymfm_output<2> out;
+  int aOut=0;
+  bool mult0=false;
+
+  if (pos==0) {
+    ((ymfm::ym2414*)fmPreviewOPZ)->reset();
+
+    // set params
+    for (int i=0; i<4; i++) {
+      if ((params.op[i].mult&15)==0) {
+        mult0=true;
+        break;
+      }
+    }
+    for (int i=0; i<4; i++) {
+      const DivInstrumentFM::Operator& op=params.op[i];
+      unsigned short baseAddr=i*8;
+      OPZ_WRITE(baseAddr+0x40,(op.mult&15)|((op.egt?(op.dt&7):dtTableFMP[op.dt&7])<<4));
+      OPZ_WRITE(baseAddr+0x40,(op.dvb&15)|((op.ws&7)<<4)|0x80);
+      OPZ_WRITE(baseAddr+0x60,op.tl);
+      OPZ_WRITE(baseAddr+0x80,(op.ar&31)|(op.egt<<5)|(op.rs<<6));
+      OPZ_WRITE(baseAddr+0xa0,(op.dr&31)|(op.am<<7));
+      OPZ_WRITE(baseAddr+0xc0,(op.d2r&31)|(op.dt2<<6));
+      OPZ_WRITE(baseAddr+0xc0,(op.dam&7)|(op.ksl<<6)|0x20);
+      OPZ_WRITE(baseAddr+0xe0,(op.rr&15)|(op.sl<<4));
+    }
+    OPZ_WRITE(0x38,((params.fms&7)<<4)|(params.ams&3));
+    OPZ_WRITE(0x38,((params.fms2&7)<<4)|(params.ams2&3)|0x84);
+    OPZ_WRITE(0x28,mult0?0x39:0x29); // frequency
+    OPZ_WRITE(0x30,0xe7);
+    OPZ_WRITE(0x20,(params.alg&7)|((params.fb&7)<<3)|0x40); // key on
+  }
+
+  // render
+  for (int i=0; i<FM_PREVIEW_SIZE; i++) {
+    aOut=0;
+    ((ymfm::ym2414*)fmPreviewOPZ)->generate(&out,1);
+    aOut+=out.data[0];
+    if (aOut<-32768) aOut=-32768;
+    if (aOut>32767) aOut=32767;
+    fmPreview[i]=aOut;
+  }
 }
 
 void FurnaceGUI::renderFMPreview(const DivInstrument* ins, int pos) {
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 35c612714..d72a05559 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -6877,6 +6877,7 @@ FurnaceGUI::FurnaceGUI():
   fmPreviewOPL(NULL),
   fmPreviewOPLL(NULL),
   fmPreviewOPZ(NULL),
+  fmPreviewOPZInterface(NULL),
   editString(NULL),
   pendingRawSampleDepth(8),
   pendingRawSampleChannels(1),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index e9ebe8936..2707004f5 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1353,6 +1353,7 @@ class FurnaceGUI {
   void* fmPreviewOPL;
   void* fmPreviewOPLL;
   void* fmPreviewOPZ;
+  void* fmPreviewOPZInterface;
   String* editString;
 
   String pendingRawSample;