Fix: Make BPM Display work.

stepmania/src/BPMDisplay.cpp

@@ -202,6 +202,13 @@ void BPMDisplay::SetBPM( const Course* pCourse )
 	m_fCycleTime = 0.2f;
 }
 
+void BPMDisplay::SetBPM( float fBPM )
+{
+	DisplayBpms bpms;
+	bpms.Add( fBPM );
+	SetBPMRange( bpms );
+}
+
 void BPMDisplay::DrawPrimitives()
 {
 	ActorFrame::DrawPrimitives();

stepmania/src/BPMDisplay.h

@@ -21,6 +21,7 @@ public:
 	virtual void DrawPrimitives(); 
 	void SetBPM( const Song* pSong );
 	void SetBPM( const Course* pCourse );
+	void SetBPM( float fBPM );
 	void CycleRandomly();
 	void NoBPM();
 

stepmania/src/ScreenGameplay.cpp

@@ -640,6 +640,7 @@ void ScreenGameplay::Init()
 	m_BPMDisplay.Load();
 	SET_XY( m_BPMDisplay );
 	this->AddChild( &m_BPMDisplay );
+	m_fLastBPS = 0;
 
 	ZERO( m_pInventory );
     FOREACH_PlayerNumber(p)
@@ -983,18 +984,6 @@ void ScreenGameplay::LoadNextSong()
 
 	m_textSongTitle.SetText( GAMESTATE->m_pCurSong->m_sMainTitle );
 
-	/* XXX: set it to the current BPM, not the range */
-	/* What does this comment mean?  -Chris 
-	 *
-	 * We're in gameplay.  A BPM display should display the current BPM, updating
-	 * it as it changes, instead of the "BPM preview" of ScreenSelectMusic.  That'd
-	 * be used in IIDX, anyway.  (Havn't done this since I don't know what this is
-	 * currently actually used for and don't feel like investigating it until it's
-	 * needed.)
-	 * -glenn
-	 */
-	m_BPMDisplay.SetBPM( GAMESTATE->m_pCurSong );
-
 	const bool bReverse[NUM_PLAYERS] = { 
 		GAMESTATE->m_PlayerOptions[0].m_fScrolls[PlayerOptions::SCROLL_REVERSE] == 1,
 		GAMESTATE->m_PlayerOptions[1].m_fScrolls[PlayerOptions::SCROLL_REVERSE] == 1
@@ -1502,6 +1491,15 @@ void ScreenGameplay::Update( float fDeltaTime )
 		this->PostScreenMessage( SM_NotesEnded, 0 );
 	}
 
+	//
+	// update bpm display
+	//
+	if ( m_fLastBPS != GAMESTATE->m_fCurBPS )
+	{
+		m_fLastBPS = GAMESTATE->m_fCurBPS;
+		m_BPMDisplay.SetBPM( GAMESTATE->m_fCurBPS * 60.0 );
+	}
+
 	//
 	// play assist ticks
 	//

stepmania/src/ScreenGameplay.h

@@ -119,6 +119,7 @@ protected:
 	BitmapText			m_textStepsDescription[NUM_PLAYERS];
 
 	BPMDisplay			m_BPMDisplay;
+	float				m_fLastBPS;
 
 	Sprite				m_sprScoreFrame;
 	ScoreDisplay*		m_pPrimaryScoreDisplay[NUM_PLAYERS];