From 503a79c904206bd84abe2104982fea2a97e8175d Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Tue, 25 Jan 2022 15:51:53 -0500
Subject: [PATCH] what?

---
 src/engine/engine.cpp | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index e234987a..ab3d9823 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -2134,6 +2134,9 @@ SafeWriter* DivEngine::saveVGM() {
   int hasC352=0;
   int hasGA20=0;
 
+  int loopPos=-1;
+  int loopTick=-1;
+
   SafeWriter* w=new SafeWriter;
   w->init();
 
@@ -2533,6 +2536,12 @@ SafeWriter* DivEngine::saveVGM() {
   playSub(false);
   size_t tickCount=0;
   while (!done) {
+    if (loopPos==-1) {
+      if (loopOrder==curOrder && loopRow==curRow) {
+        loopPos=w->tell();
+        loopTick=tickCount;
+      }
+    }
     if (nextTick()) done=true;
     // get register dumps
     for (int i=0; i<song.systemLen; i++) {
@@ -2616,8 +2625,8 @@ SafeWriter* DivEngine::saveVGM() {
   w->seek(0x18,SEEK_SET);
   w->writeI(tickCount);
   // loop not handled for now
-  w->writeI(0);
-  w->writeI(0);
+  w->writeI(loopPos-0x1c);
+  w->writeI(tickCount-loopTick);
 
   remainingLoops=-1;
   playing=false;