source/frontend/scrollbg.cpp

@@ -62,6 +62,13 @@
   ---------------------------------------------------------------------- */
 void CScrollyBackground::init()
 {
+	m_sprites=new ("Scrolly Background sprites") SpriteBank;
+	m_sprites->load(FRONTEND_FRONTEND_SPR);
+	m_xOff=m_yOff=0;
+
+	setSpeed(DEFAULT_X_SPEED,DEFAULT_Y_SPEED);
+	setSpeedScale(DEFAULT_SPEED_SCALE);
+	setOt(DEFAULT_OT);
 }
 
 
@@ -73,6 +80,7 @@ void CScrollyBackground::init()
   ---------------------------------------------------------------------- */
 void CScrollyBackground::shutdown()
 {
+	m_sprites->dump();	delete m_sprites;	m_sprites=NULL;
 }
 
 
@@ -84,6 +92,27 @@ void CScrollyBackground::shutdown()
   ---------------------------------------------------------------------- */
 void CScrollyBackground::render()
 {
+	POLY_FT4	*ft4;
+	sFrameHdr	*fh;
+	int			x,y,w,h;
+
+	fh=m_sprites->getFrameHeader(FRM__BG1);
+	w=fh->W;
+	h=fh->H;
+	y=(m_yOff>>m_speedScale)-h;
+	do
+	{
+		x=(m_xOff>>m_speedScale)-w;
+		do
+		{
+			ft4=m_sprites->printFT4(fh,x,y,0,0,m_ot);
+			setSemiTrans(ft4,true);
+			x+=w;
+		}
+		while(x<512);
+		y+=h;
+	}
+	while(y<256);
 }
 
 
@@ -95,6 +124,12 @@ void CScrollyBackground::render()
   ---------------------------------------------------------------------- */
 void CScrollyBackground::think(int _frames)
 {
+	sFrameHdr	*fh;
+
+	fh=m_sprites->getFrameHeader(FRM__BG1);
+
+	m_xOff=(m_xOff+(_frames*m_xSpeed))%(fh->W<<m_speedScale);
+	m_yOff=(m_yOff+(_frames*m_ySpeed))%(fh->H<<m_speedScale);
 }
 
 

source/frontend/scrollbg.h

@@ -5,7 +5,7 @@
 	Author:		PKG
 	Created:
 	Project:	Spongebob
-	Purpose:
+	Purpose:	Scrolling tiled background class
 
 	Copyright (c) 2000 Climax Development Ltd
 
@@ -37,9 +37,25 @@ public:
 	void				render();
 	void				think(int _frames);
 
+	void				setSpeed(int _xSpeed,int _ySpeed)			{m_xSpeed=_xSpeed;m_ySpeed=_ySpeed;}
+	void				setSpeedScale(int _speedScale)				{m_speedScale=_speedScale;}
+	void				setOt(int _ot)								{m_ot=_ot;}
+
+
 private:
+	enum
+	{
+		DEFAULT_X_SPEED=-2,
+		DEFAULT_Y_SPEED=-3,
+		DEFAULT_SPEED_SCALE=2,
+		DEFAULT_OT=1000,
+	};
+
 	class SpriteBank	*m_sprites;
 	int					m_xOff,m_yOff;
+	int					m_xSpeed,m_ySpeed;
+	int					m_speedScale;
+	int					m_ot;
 
 };