Tiled Background Modes

Data Structures
struct	PA_BgStruct
	Background structure. More...

Macros
#define	_GFX_ALIGN   __attribute__((aligned (4)))
	Graphics align define for PAGfx.
#define	PA_HideBg(screen, bg_select)   _REG16(REG_BGSCREEN(screen)) &= ~(0x100 << (bg_select))
	Hide a screen's background.
#define	PA_ShowBg(screen, bg_select)   _REG16(REG_BGSCREEN(screen)) |= (0x100 << (bg_select))
	Show a hidden background.
#define	PA_ResetBg(screen)   _REG16(REG_BGSCREEN(screen)) &= ~(0xF00)
	Reinitialize de Bg system of a screen. It only hides all the backgrounds in reality...
#define	PA_LoadBgTiles(screen, bg_select, bg_tiles)   PA_LoadBgTilesEx(screen, bg_select, (void*)bg_tiles, SIZEOF_16BIT(bg_tiles))
	[DEPRECATED] Load a tileset into memory
#define	PA_LoadTiledBg(screen, bg_number, bg_name)
	[DEPRECATED] This will never get easier... Loads a background TiledBg converted with PAGfx, with its tiles, map, and palette. Only 256 color mode available.
#define	PA_LoadSimpleBg(screen, bg_select, bg_tiles, bg_map, bg_size, wraparound, color_mode)
	[DEPRECATED] Simple way to load a Background. Combines PA_InitBg, PA_LoadBgTiles, and PA_LoadBgMap
#define	PA_LoadBg(screen, bg_select, bg_tiles, tile_size, bg_map, bg_size, wraparound, color_mode)
	[DEPRECATED] Simplest way to load a Background. Combines PA_InitBg, PA_LoadBgTiles, and PA_LoadBgMap
#define	PA_SetMapTileAll(screen, bg_select, x, y, tile_info)   *(u16*)(PA_BgInfo[screen][bg_select].Map + ((x) << 1) + ((y) << 6)) = (tile_info)
	Change the tile info used by a given tile in the map.
#define	PA_EasyBgLoad(screen, bg_number, bg_name)
	[DEPRECATED] Easiest way to load a background converted with PAGfx...
#define	PA_EasyBgLoadPtr(screen, bg_number, bg_name)
	[DEPRECATED] Easiest way to load a background converted with PAGfx... Can take pointers !

Enumerations
enum	{   PA_BgInvalid , PA_BgNormal , PA_BgLarge , PA_BgUnlimited ,   PA_BgRot , PA_Font1bit , PA_Font4bit , PA_Font8bit }
	Types of background. More...

Functions
void	PA_ResetBgSys (void)
	Reset the background system.
void	PA_ResetBgSysScreen (u8 screen)
	Reset the background system on 1 screen.
void	PA_InitBg (u8 screen, u8 bg_select, u8 bg_size, u8 wraparound, u8 color_mode)
	Initialise a given background. Do this only after having loaded a tileset and a map.
void	PA_LoadBgTilesEx (u8 screen, u8 bg_select, void *bg_tiles, u32 size)
	Load a tileset into memory with a given size.
void	PA_ReLoadBgTiles (u8 screen, u8 bg_select, void *bg_tiles)
	ReLoad a tileset into memory.
void	PA_DeleteTiles (u8 screen, u8 bg_select)
	Delete a tilest in memory. Note that loading a tileset automatically deletes the preceding one, so you won't need to use this function often.
void	PA_DeleteMap (u8 screen, u8 bg_select)
	Delete a map in memory. Note that loading a map automatically deletes the preceding one, so you won't need to use this function often.
static void	PA_DeleteBg (u8 screen, u8 bg_select)
	Delete and reset a complete background.
void	PA_LoadBgMap (u8 screen, u8 bg_select, void *bg_map, u8 bg_size)
	Load a background's map info.
void	PA_LoadBackground (u8 screen, u8 bg_select, const PA_BgStruct *bg_name)
	Load a background (EasyBg or RotBg).
static void	PA_BGScrollX (u8 screen, u8 bg_number, s32 x)
	Scroll horizontaly a Tiled background.
static void	PA_BGScrollY (u8 screen, u8 bg_number, s32 y)
	Scroll vertically a Tiled background.
static void	PA_SetMapTile (u8 screen, u8 bg_select, s16 x, s16 y, s16 tile_number)
	Change the tile gfx used by a given tile in the map.
static void	PA_SetLargeMapTile (u8 screen, u8 bg_select, s32 x, s32 y, u32 tile_info)
	Change the tile info used by a given tile in the map, only for big background (512 large or wide)
static void	PA_SetMapTileHflip (u8 screen, u8 bg_select, u8 x, u8 y, u8 hflip)
	Flip a given tile horizontaly.
static void	PA_SetMapTileVflip (u8 screen, u8 bg_select, u8 x, u8 y, u8 vflip)
	Flip a given tile verticaly.
static void	PA_SetMapTilePal (u8 screen, u8 bg_select, u8 x, u8 y, u8 palette_number)
	Change the 16 color palette used by a tile. Works only if the Bg is in 16 colors...
static void	PA_SetBgPrio (u8 screen, u8 bg, u8 prio)
	Change a backgrounds priority.
static void	PA_SetBgPrioSeq (u8 screen, u8 priority0, u8 priority1, u8 priority2, u8 priority3)
	Change all the background priorities to a given background order.
static void	PA_ClearBg (u8 screen, u8 bg_select)
	Erase a given background (just the tilemap)
void	PA_EasyBgScrollX (u8 screen, u8 bg_number, s32 x)
	Scroll horizontaly any background.
void	PA_EasyBgScrollY (u8 screen, u8 bg_number, s32 y)
	Scroll vertically any background.
static void	PA_EasyBgScrollXY (u8 screen, u8 bg_number, s32 x, s32 y)
	Scroll horizontaly and vertically any background.
static u8	PA_EasyBgGetPixel (u8 screen, u8 bg_number, s32 x, s32 y)
	Returns the color (number in the palette) of the screen pixel...
static u16	PA_EasyBgGetPixelCol (u8 screen, u8 bg_number, s32 x, s32 y)
	Returns the color (u16 value) of the screen pixel...
static void	PA_SetBgWrap (u8 screen, u8 bg, u8 wrap)
	Set on/off the background wrapping (for rotating, 8bit, and 16bit backgrounds)
static void	PA_InitParallaxX (u8 screen, s32 bg0, s32 bg1, s32 bg2, s32 bg3)
	Initialise Parallax Scrolling for multiple backgrounds, horizontaly. Chose the speed at which each background will scroll compared to the others. Then use PA_ParallaxScrollX to scroll...
static void	PA_InitParallaxY (u8 screen, s32 bg0, s32 bg1, s32 bg2, s32 bg3)
	Initialise Parallax Scrolling for multiple backgrounds, horizontaly. Chose the speed at which each background will scroll compared to the others. Then use PA_ParallaxScrollX to scroll...
static void	PA_ParallaxScrollX (u8 screen, s32 x)
	Scroll the backgrounds.
static void	PA_ParallaxScrollY (u8 screen, s32 y)
	Scroll the backgrounds.
static void	PA_ParallaxScrollXY (u8 screen, s32 x, s32 y)
	Scroll the backgrounds.

Detailed Description

Load a background, scroll it, etc...

Macro Definition Documentation

PA_HideBg

#define PA_HideBg	(		screen,
			bg_select
	)		_REG16(REG_BGSCREEN(screen)) &= ~(0x100 << (bg_select))

Hide a screen's background.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)

PA_ShowBg

#define PA_ShowBg	(		screen,
			bg_select
	)		_REG16(REG_BGSCREEN(screen)) |= (0x100 << (bg_select))

Show a hidden background.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)

PA_ResetBg

#define PA_ResetBg

(

screen

)

_REG16(REG_BGSCREEN(screen)) &= ~(0xF00)

Reinitialize de Bg system of a screen. It only hides all the backgrounds in reality...

Parameters

screen

Choose the screen (0 or 1)

PA_LoadBgTiles

#define PA_LoadBgTiles	(		screen,
			bg_select,
			bg_tiles
	)		PA_LoadBgTilesEx(screen, bg_select, (void*)bg_tiles, SIZEOF_16BIT(bg_tiles))

[DEPRECATED] Load a tileset into memory

Deprecated:

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)
bg_tiles	Name of the tiles' info (example: ship_Tiles)

PA_LoadTiledBg

#define PA_LoadTiledBg	(		screen,
			bg_number,
			bg_name
	)

Value:

    do{\
    PA_DEPRECATED_MACRO;\
    PA_LoadBgPal(screen, bg_number, (void*)bg_name##_Pal); \
    PA_LoadSimpleBg(screen, bg_number, bg_name##_Tiles, bg_name##_Map, PA_GetPAGfxBgSize(bg_name##_Info[1], bg_name##_Info[2]), 0, 1);}while(0)

[DEPRECATED] This will never get easier... Loads a background TiledBg converted with PAGfx, with its tiles, map, and palette. Only 256 color mode available.

Deprecated:

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number to load (from 0 to 3)
bg_name	Background name, like bg0

PA_LoadSimpleBg

#define PA_LoadSimpleBg	(		screen,
			bg_select,
			bg_tiles,
			bg_map,
			bg_size,
			wraparound,
			color_mode
	)

Value:

    do{\
    PA_DEPRECATED_MACRO;\
    PA_DeleteBg(screen, bg_select);\
    PA_LoadBgTiles(screen, bg_select, bg_tiles); \
    PA_LoadBgMap(screen, bg_select, (void*)bg_map, bg_size); \
    PA_InitBg(screen, bg_select, bg_size, 0, color_mode);\
    PA_BGScrollXY(screen, bg_select, 0, 0);}while(0)

[DEPRECATED] Simple way to load a Background. Combines PA_InitBg, PA_LoadBgTiles, and PA_LoadBgMap

Deprecated:

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)
bg_tiles	Name of the tiles' info (example: ship_Tiles)
bg_map	Name of the map's info (example : ship_Map)
bg_size	Background size. To use a normal background, use the macros BG_256X256, BG_256X512, etc...
wraparound	If the background wraps around or not. More important for rotating backgrounds.
color_mode	Color mode : 0 for 16 color mode, 1 for 256...

PA_LoadBg

#define PA_LoadBg	(		screen,
			bg_select,
			bg_tiles,
			tile_size,
			bg_map,
			bg_size,
			wraparound,
			color_mode
	)

Value:

    do{\
    PA_DEPRECATED_MACRO;\
    PA_LoadBgTilesEx(screen, bg_select, (void*)bg_tiles, tile_size); \
    PA_LoadBgMap(screen, bg_select, (void*)bg_map, bg_size); \
    PA_InitBg(screen, bg_select, bg_size, 0, color_mode);\
    PA_BGScrollXY(screen, bg_select, 0, 0);}while(0)

[DEPRECATED] Simplest way to load a Background. Combines PA_InitBg, PA_LoadBgTiles, and PA_LoadBgMap

Deprecated:

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)
bg_tiles	Name of the tiles' info (example: ship_Tiles)
tile_size	Size of your tileset
bg_map	Name of the map's info (example : ship_Map)
bg_size	Background size. This is important, because it also determines whether the Bg is rotatable or not. To use a normal background, use the macros BG_256X256, BG_256X512, etc... For a rotatable Bg, use the macros BG_ROT_128X128...
wraparound	If the background wraps around or not. More important for rotating backgrounds.
color_mode	Color mode : 0 for 16 color mode, 1 for 256...

PA_SetMapTileAll

#define PA_SetMapTileAll	(		screen,
			bg_select,
			x,
			y,
			tile_info
	)		*(u16*)(PA_BgInfo[screen][bg_select].Map + ((x) << 1) + ((y) << 6)) = (tile_info)

Change the tile info used by a given tile in the map.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number (0-3)
x	X value of the tile to change
y	Y value of the map tile to change
tile_info	New tile to put (tile + palette + flips...)

PA_EasyBgLoad

#define PA_EasyBgLoad	(		screen,
			bg_number,
			bg_name
	)

Value:

    do{PA_BgInfo[screen][bg_number].BgMode = bg_name##_Info[0];\
    PA_DEPRECATED_MACRO;\
    PA_StoreEasyBgInfos(screen, bg_number, bg_name##_Info[0], bg_name##_Info[1], bg_name##_Info[2], (void*)bg_name##_Tiles, SIZEOF_16BIT(bg_name##_Tiles), (void*)bg_name##_Map, SIZEOF_16BIT(bg_name##_Map), (void*)bg_name##_Pal);\
    if(PA_BgInfo[screen][bg_number].BgMode == BG_TILEDBG){  PA_LoadTiledBg(screen, bg_number, bg_name);}\
    else{PA_LoadPAGfxLargeBg(screen, bg_number, bg_name);}}while(0)

[DEPRECATED] Easiest way to load a background converted with PAGfx...

Deprecated:

Parameters

screen	Choose de screen (0 or 1)
bg_number	Background number... (0-3)
bg_name	Background name

PA_EasyBgLoadPtr

#define PA_EasyBgLoadPtr	(		screen,
			bg_number,
			bg_name
	)

Value:

    do{\
    PA_DEPRECATED_MACRO;\
    PA_EasyBgLoadEx(screen, bg_number, (u32*)bg_name->Info, bg_name->Tiles, bg_name->TileSize, bg_name->Map, bg_name->MapSize, bg_name->Palette);\
}while(0)

[DEPRECATED] Easiest way to load a background converted with PAGfx... Can take pointers !

Deprecated:

Parameters

screen	Choose de screen (0 or 1)
bg_number	Background number... (0-3)
bg_name	Background, like &bg0

Enumeration Type Documentation

anonymous enum

anonymous enum

Types of background.

Enumerator
PA_BgInvalid	Invalid background.
PA_BgNormal	Normal tiled background AKA TiledBg.
PA_BgLarge	Large background AKA LargeMap.
PA_BgUnlimited	Unlimited background AKA InfiniteMap.
PA_BgRot	Rotational background.
PA_Font1bit	1-bit bitmap font
PA_Font4bit	4-bit bitmap font
PA_Font8bit	8-bit bitmap font

Function Documentation

PA_ResetBgSysScreen()

void PA_ResetBgSysScreen

(

u8

screen

)

Reset the background system on 1 screen.

Parameters

screen

Choose the screen (0 or 1)

PA_InitBg()

void PA_InitBg	(	u8	screen,
		u8	bg_select,
		u8	bg_size,
		u8	wraparound,
		u8	color_mode
	)

Initialise a given background. Do this only after having loaded a tileset and a map.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)
bg_size	Background size. This is important, because it also determines whether the Bg is rotatable or not. To use a normal background, use the macros BG_256X256, BG_256X512, etc... For a rotatable Bg, use the macros BG_ROT_128X128...
wraparound	If the background wraps around or not. More important for rotating backgrounds.
color_mode	Color mode : 0 for 16 color mode, 1 for 256...

PA_LoadBgTilesEx()

void PA_LoadBgTilesEx	(	u8	screen,
		u8	bg_select,
		void *	bg_tiles,
		u32	size
	)

Load a tileset into memory with a given size.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)
bg_tiles	Name of the tiles' info (example: ship_Tiles)
size	16 bit size...

PA_ReLoadBgTiles()

void PA_ReLoadBgTiles	(	u8	screen,
		u8	bg_select,
		void *	bg_tiles
	)

ReLoad a tileset into memory.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)
bg_tiles	Name of the tiles' info (example: ship_Tiles)

PA_DeleteTiles()

void PA_DeleteTiles	(	u8	screen,
		u8	bg_select
	)

Delete a tilest in memory. Note that loading a tileset automatically deletes the preceding one, so you won't need to use this function often.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)

PA_DeleteMap()

void PA_DeleteMap	(	u8	screen,
		u8	bg_select
	)

Delete a map in memory. Note that loading a map automatically deletes the preceding one, so you won't need to use this function often.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)

PA_DeleteBg()

static inline void PA_DeleteBg ( u8  screen, u8  bg_select  )

inlinestatic

Delete and reset a complete background.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)

PA_LoadBgMap()

void PA_LoadBgMap	(	u8	screen,
		u8	bg_select,
		void *	bg_map,
		u8	bg_size
	)

Load a background's map info.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number to load (from 0 to 3)
bg_map	Name of the map's info (example : (void*)ship_Map) Don't forget the void...
bg_size	Background size. This is important, because it also determines whether the Bg is rotatable or not. To use a normal background, use the macros BG_256X256, BG_256X512, etc...

PA_LoadBackground()

void PA_LoadBackground	(	u8	screen,
		u8	bg_number,
		const PA_BgStruct *	bg_name
	)

Load a background (EasyBg or RotBg).

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number... (0-3)
bg_name	Pointer to the background (struct)

Examples

Backgrounds/Effects/Mode7/source/main.c.

PA_BGScrollX()

static inline void PA_BGScrollX ( u8  screen, u8  bg_number, s32  x  )

inlinestatic

Scroll horizontaly a Tiled background.

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number (0-3)
x	X value to scroll

PA_BGScrollY()

static inline void PA_BGScrollY ( u8  screen, u8  bg_number, s32  y  )

inlinestatic

Scroll vertically a Tiled background.

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number (0-3)
y	Y value to scroll

PA_SetMapTile()

static inline void PA_SetMapTile ( u8  screen, u8  bg_select, s16  x, s16  y, s16  tile_number  )

inlinestatic

Change the tile gfx used by a given tile in the map.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number (0-3)
x	X value of the tile to change
y	Y value of the map tile to change
tile_number	New tile number to put

PA_SetLargeMapTile()

static inline void PA_SetLargeMapTile ( u8  screen, u8  bg_select, s32  x, s32  y, u32  tile_info  )

inlinestatic

Change the tile info used by a given tile in the map, only for big background (512 large or wide)

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number (0-3)
x	X value of the tile to change
y	Y value of the map tile to change
tile_info	New tile to put (tile + palette + flips...)

PA_SetMapTileHflip()

void PA_SetMapTileHflip ( u8  screen, u8  bg_select, u8  x, u8  y, u8  hflip  )

inlinestatic

Flip a given tile horizontaly.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number (0-3)
x	X value of the tile to change
y	Y value of the map tile to change
hflip	Set the map tile to horizontal flip

PA_SetMapTileVflip()

static inline void PA_SetMapTileVflip ( u8  screen, u8  bg_select, u8  x, u8  y, u8  vflip  )

inlinestatic

Flip a given tile verticaly.

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number (0-3)
x	X value of the tile to change
y	Y value of the map tile to change
vflip	Set the map tile to vertical flip

PA_SetMapTilePal()

static inline void PA_SetMapTilePal ( u8  screen, u8  bg_select, u8  x, u8  y, u8  palette_number  )

inlinestatic

Change the 16 color palette used by a tile. Works only if the Bg is in 16 colors...

Parameters

screen	Choose the screen (0 or 1)
bg_select	Background number (0-3)
x	X value of the tile to change
y	Y value of the map tile to change
palette_number	Palette number (0-15)

PA_SetBgPrio()

static inline void PA_SetBgPrio ( u8  screen, u8  bg, u8  prio  )

inlinestatic

Change a backgrounds priority.

Parameters

screen	Choose the screen (0 or 1)
bg	Background...
prio	Priority level (0-3, 0 being the highest)

PA_SetBgPrioSeq()

static inline void PA_SetBgPrioSeq ( u8  screen, u8  priority0, u8  priority1, u8  priority2, u8  priority3  )

inlinestatic

Change all the background priorities to a given background order.

Parameters

screen	Choose the screen (0 or 1)
priority0	Background to show on top
priority1	Next one...
priority2	Next one...
priority3	Last one...

PA_ClearBg()

static inline void PA_ClearBg ( u8  screen, u8  bg_select  )

inlinestatic

Erase a given background (just the tilemap)

Parameters

screen	Choose de screen (0 or 1)
bg_select	Background...

PA_EasyBgScrollX()

void PA_EasyBgScrollX	(	u8	screen,
		u8	bg_number,
		s32	x
	)

Scroll horizontaly any background.

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number (0-3)
x	X value to scroll

PA_EasyBgScrollY()

void PA_EasyBgScrollY	(	u8	screen,
		u8	bg_number,
		s32	y
	)

Scroll vertically any background.

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number (0-3)
y	Y value to scroll

PA_EasyBgScrollXY()

static inline void PA_EasyBgScrollXY ( u8  screen, u8  bg_number, s32  x, s32  y  )

inlinestatic

Scroll horizontaly and vertically any background.

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number (0-3)
x	X value to scroll
y	Y value to scroll

PA_EasyBgGetPixel()

static inline u8 PA_EasyBgGetPixel ( u8  screen, u8  bg_number, s32  x, s32  y  )

inlinestatic

Returns the color (number in the palette) of the screen pixel...

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number (0-3)
x	X screen pixel position
y	Y screen pixel position

PA_EasyBgGetPixelCol()

static inline u16 PA_EasyBgGetPixelCol ( u8  screen, u8  bg_number, s32  x, s32  y  )

inlinestatic

Returns the color (u16 value) of the screen pixel...

Parameters

screen	Choose the screen (0 or 1)
bg_number	Background number (0-3)
x	X screen pixel position
y	Y screen pixel position

PA_SetBgWrap()

static inline void PA_SetBgWrap ( u8  screen, u8  bg, u8  wrap  )

inlinestatic

Set on/off the background wrapping (for rotating, 8bit, and 16bit backgrounds)

Parameters

screen	Choose the screen (0 or 1)
bg	Background number (0-3)
wrap	Wrap around on or off...

Examples

Backgrounds/Effects/Mode7/source/main.c.

PA_InitParallaxX()

static inline void PA_InitParallaxX ( u8  screen, s32  bg0, s32  bg1, s32  bg2, s32  bg3  )

inlinestatic

Initialise Parallax Scrolling for multiple backgrounds, horizontaly. Chose the speed at which each background will scroll compared to the others. Then use PA_ParallaxScrollX to scroll...

Parameters

screen	Chose de screen (0 or 1)
bg0	Value for the first background (0). Set to 256 for normal scroll speed, lower for lower speed (128 is half speed...), higher for faster (512 is twice as fast...). You can set negative values. 0 inactivates parallax scrolling for this background
bg1	Same thing for Background 1
bg2	Same thing for Background 2
bg3	Same thing for Background 3

PA_InitParallaxY()

static inline void PA_InitParallaxY ( u8  screen, s32  bg0, s32  bg1, s32  bg2, s32  bg3  )

inlinestatic

Initialise Parallax Scrolling for multiple backgrounds, horizontaly. Chose the speed at which each background will scroll compared to the others. Then use PA_ParallaxScrollX to scroll...

Parameters

screen	Chose de screen (0 or 1)
bg0	Value for the first background (0). Set to 256 for normal scroll speed, lower for lower speed (128 is half speed...), higher for faster (512 is twice as fast...). You can set negative values. 0 inactivates parallax scrolling for this background
bg1	Same thing for Background 1
bg2	Same thing for Background 2
bg3	Same thing for Background 3

PA_ParallaxScrollX()

static inline void PA_ParallaxScrollX ( u8  screen, s32  x  )

inlinestatic

Scroll the backgrounds.

Parameters

screen	Chose de screen (0 or 1)
x	X value to scroll

PA_ParallaxScrollY()

static inline void PA_ParallaxScrollY ( u8  screen, s32  y  )

inlinestatic

Scroll the backgrounds.

Parameters

screen	Chose de screen (0 or 1)
y	Y value to scroll

PA_ParallaxScrollXY()

static inline void PA_ParallaxScrollXY ( u8  screen, s32  x, s32  y  )

inlinestatic

Scroll the backgrounds.

Parameters

screen	Chose de screen (0 or 1)
x	X value to scroll
y	Y value to scroll