From e2cf64fe550840f08b98cc236667941dbbfb9aef Mon Sep 17 00:00:00 2001
From: Glenn Maynard <gmaynard@users.sourceforge.net>
Date: Fri, 21 May 2004 05:21:03 +0000
Subject: [PATCH] cache GetCourseDifficultiesToShow results

---
 stepmania/src/GameState.cpp | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/stepmania/src/GameState.cpp b/stepmania/src/GameState.cpp
index bb6316c124..1bb0d45b5e 100644
--- a/stepmania/src/GameState.cpp
+++ b/stepmania/src/GameState.cpp
@@ -1648,26 +1648,37 @@ bool GameState::ChangeDifficulty( PlayerNumber pn, int dir )
 	return ChangeDifficulty( pn, diff );
 }
 
-static set<CourseDifficulty> GetCourseDifficultiesToShow()
+static void GetCourseDifficultiesToShow( set<CourseDifficulty> &ret )
 {
+	static float fExpiration = -999;
+	static set<CourseDifficulty> cache;
+	if( RageTimer::GetTimeSinceStart() < fExpiration )
+	{
+		ret = cache;
+		return;
+	}
+
 	CStringArray asDiff;
 	split( COURSE_DIFFICULTIES_TO_SHOW, ",", asDiff );
 	ASSERT( asDiff.size() > 0 );
 
-	set<CourseDifficulty> ret;
+	cache.clear();
 	for( unsigned i = 0; i < asDiff.size(); ++i )
 	{
 		CourseDifficulty cd = StringToCourseDifficulty(asDiff[i]);
 		if( cd == NUM_COURSE_DIFFICULTIES )
 			RageException::Throw( "Unknown difficulty \"%s\" in CourseDifficultiesToShow", asDiff[i].c_str() );
-		ret.insert( cd );
+		cache.insert( cd );
 	}
-	return ret;
+
+	fExpiration = RageTimer::GetTimeSinceStart()+1;
+	ret = cache;
 }
 
 bool GameState::ChangeCourseDifficulty( PlayerNumber pn, int dir )
 {
-	const set<CourseDifficulty> asDiff = GetCourseDifficultiesToShow();
+	set<CourseDifficulty> asDiff;
+	GetCourseDifficultiesToShow( asDiff );
 
 	CourseDifficulty cd = m_PreferredCourseDifficulty[pn];
 	do {
@@ -1687,7 +1698,8 @@ bool GameState::ChangeCourseDifficulty( PlayerNumber pn, int dir )
 
 bool GameState::IsCourseDifficultyShown( CourseDifficulty cd )
 {
-	const set<CourseDifficulty> asDiff = GetCourseDifficultiesToShow();
+	set<CourseDifficulty> asDiff;
+	GetCourseDifficultiesToShow( asDiff );
 	return asDiff.find(cd) != asDiff.end();
 }