From 7f38a03093cf20e1db57ec739029fff316e69686 Mon Sep 17 00:00:00 2001
From: Diegoisawesome <diego@domoreaweso.me>
Date: Tue, 25 Sep 2018 11:41:18 -0500
Subject: [PATCH] mid2agb compression algorithm less buggy than originally
 thought

---
 tools/mid2agb/midi.cpp | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/tools/mid2agb/midi.cpp b/tools/mid2agb/midi.cpp
index 8a84a0945..be5454d4e 100644
--- a/tools/mid2agb/midi.cpp
+++ b/tools/mid2agb/midi.cpp
@@ -773,7 +773,6 @@ void CalculateWaits(std::vector<Event>& events)
     }
 }
 
-// This code is (purposely) buggy as shit, to mimic how the real mid2agb worked
 int CalculateCompressionScore(std::vector<Event>& events, int index)
 {
     int score = 0;
@@ -782,7 +781,12 @@ int CalculateCompressionScore(std::vector<Event>& events, int index)
     EventType lastType = events[index].type;
     std::int32_t lastDuration = 0x80000000;
     std::uint8_t lastNote = 0x80u;
-    //std::int32_t lastParam2;
+
+    if (events[index].type == EventType::Note)
+    {
+        // Bug reintroduction
+        lastParam1 |= events[index].note + 0x40;
+    }
 
     if (events[index].time > 0)
         score++;
@@ -793,11 +797,10 @@ int CalculateCompressionScore(std::vector<Event>& events, int index)
         {
             int val = 0;
 
-            // BUG: uses type instead of note
-            if ((std::uint8_t)events[i].type != lastNote)
+            if (events[i].note != lastNote)
             {
                 val++;
-                lastNote = (std::uint8_t)events[i].type;
+                lastNote = events[i].note;
             }
 
             if (events[i].param1 != lastVelocity)
@@ -845,8 +848,12 @@ int CalculateCompressionScore(std::vector<Event>& events, int index)
 
         // BUG: uses type instead of param1
         lastParam1 = (std::uint8_t)events[i].type;
-        // unused
-        //lastParam2 = events[i].param2;
+        if (events[i].type == EventType::Note)
+        {
+            // Bug reintroduction
+            lastParam1 |= events[i].note + 0x40;
+        }
+
         lastType = events[i].type;
 
         if (events[i].time)