From ab794ffb2df494cc745c92d94cf440c50c2322e8 Mon Sep 17 00:00:00 2001
From: Chris Danford <chrisdanford@users.sourceforge.net>
Date: Sun, 5 Jun 2005 03:16:57 +0000
Subject: [PATCH] don't allow multiple changes on the same beat

---
 stepmania/src/Song.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/stepmania/src/Song.cpp b/stepmania/src/Song.cpp
index 9448d4d110..7eef0d44c8 100644
--- a/stepmania/src/Song.cpp
+++ b/stepmania/src/Song.cpp
@@ -106,6 +106,16 @@ void Song::Reset()
 
 void Song::AddBackgroundChange( BackgroundLayer iLayer, BackgroundChange seg )
 {
+	// Delete old background change at this start beat, if any.
+	FOREACH( BackgroundChange, GetBackgroundChanges(iLayer), bgc )
+	{
+		if( bgc->m_fStartBeat == seg.m_fStartBeat )
+		{
+			GetBackgroundChanges(iLayer).erase( bgc );
+			break;
+		}
+	}
+
 	ASSERT( iLayer >= 0 && iLayer < NUM_BackgroundLayer );
 	GetBackgroundChanges(iLayer).push_back( seg );
 	BackgroundUtil::SortBackgroundChangesArray( GetBackgroundChanges(iLayer) );