Implement faster song playback enhancement (#801)

mm/2s2h/BenGui/SearchableMenuItems.h

@@ -1226,7 +1226,13 @@ void AddEnhancements() {
                 WIDGET_CVAR_SLIDER_INT,
                 { 1, 7, 7 } },
               { "Prevent Dropped Ocarina Inputs", "gEnhancements.Playback.NoDropOcarinaInput",
-                "Prevent dropping inputs when playing the ocarina quickly.", WIDGET_CVAR_CHECKBOX } } } });
+                "Prevent dropping inputs when playing the ocarina quickly.", WIDGET_CVAR_CHECKBOX },
+              { "Faster Song Playback",
+                "gEnhancements.Songs.FasterSongPlayback",
+                "Speeds up the playback of songs.",
+                WIDGET_CVAR_CHECKBOX,
+                {},
+                [](widgetInfo& info) { RegisterFasterSongPlayback(); } } } } });
     enhancementsSidebar.push_back(
         { "Time Savers",
           3,

mm/2s2h/Enhancements/Enhancements.cpp

@@ -55,6 +55,7 @@ void InitEnhancements() {
 
     // Songs
     RegisterEnableSunsSong();
+    RegisterFasterSongPlayback();
     RegisterPauseOwlWarp();
     RegisterZoraEggCount();
 

mm/2s2h/Enhancements/Songs/FasterSongPlayback.cpp

@@ -0,0 +1,30 @@
+#include "2s2h/GameInteractor/GameInteractor.h"
+#include "libultraship/libultraship.h"
+
+extern "C" {
+#include "variables.h"
+
+extern u8 sPlaybackState;
+}
+
+void RegisterFasterSongPlayback() {
+    static uint32_t onPlayerUpdate = 0;
+    GameInteractor::Instance->UnregisterGameHookForID<GameInteractor::OnActorUpdate>(onPlayerUpdate);
+
+    onPlayerUpdate = 0;
+
+    if (!CVarGetInteger("gEnhancements.Songs.FasterSongPlayback", 0)) {
+        return;
+    }
+
+    onPlayerUpdate =
+        GameInteractor::Instance->RegisterGameHookForID<GameInteractor::OnActorUpdate>(ACTOR_PLAYER, [](Actor* actor) {
+            if (gPlayState->msgCtx.msgMode >= MSGMODE_SONG_PLAYED && gPlayState->msgCtx.msgMode <= MSGMODE_17) {
+                if (gPlayState->msgCtx.stateTimer > 1) {
+                    gPlayState->msgCtx.stateTimer = 1;
+                }
+                gPlayState->msgCtx.ocarinaSongEffectActive = 0;
+                sPlaybackState = 0;
+            }
+        });
+}

mm/2s2h/Enhancements/Songs/Songs.h

@@ -2,6 +2,7 @@
 #define SONGS_H
 
 void RegisterEnableSunsSong();
+void RegisterFasterSongPlayback();
 void RegisterZoraEggCount();
 void RegisterPauseOwlWarp();