mode7.h File Reference

Jo Engine Mode7. More...

Go to the source code of this file.

Data Structures
struct	jo_mode7_computation_cache
	mode7 internal computation cache struct More...
struct	jo_mode7
	mode7 struct More...

Functions
bool	jo_init_mode7_for_screen_output (jo_mode7 *const params, const unsigned short tile_width, const unsigned short tile_height)
	Initialize mode 7 effect for direct screen output and pre compute projection. More...
void	jo_update_screen_output_coord_for_mode7 (jo_mode7 *const params)
	Update mode 7 computation if output_left or output_right params changed. More...
bool	jo_init_mode7_for_image_output (jo_mode7 *params, const unsigned short tile_width, const unsigned short tile_height, jo_img *const output_image)
	Initialize mode 7 effect for image output and pre compute projection. More...
void	jo_free_mode7 (jo_mode7 *const params)
	Free mode 7 computation. More...
void	jo_do_mode7_floor (const jo_img *const tile, const int cam_x, const int cam_y, const jo_mode7 *const params)
	Draw projection according to the initialized output. More...

Detailed Description

Jo Engine Mode7.

Author

Johannes Fetz

Bug:

No known bugs.

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Data Structure Documentation

jo_mode7_computation_cache

struct jo_mode7_computation_cache

mode7 internal computation cache struct

Data Fields
int *	distance
int *	line_dy
jo_color *	output
unsigned short	output_height
unsigned short	output_line_width
unsigned short	output_width
unsigned short	output_width_div2
unsigned short	output_width_sizeof
int	output_y_start
int	tile_mask_x
int	tile_mask_y

jo_mode7

struct jo_mode7

mode7 struct

Data Fields
jo_mode7_computation_cache	__cache
int	horizon
unsigned short	output_left
unsigned short	output_top
int	scale_x
int	scale_y
int	space_z

Function Documentation

jo_do_mode7_floor()

void jo_do_mode7_floor	(	const jo_img *const	tile,
		const int	cam_x,
		const int	cam_y,
		const jo_mode7 *const	params
	)

Draw projection according to the initialized output.

Parameters

tile	Tile image
cam_x	Camera horizontal position
cam_y	Camera depth (Z index) position
params	mode7 structure

jo_free_mode7()

void jo_free_mode7

(

jo_mode7 *const

params

)

Free mode 7 computation.

Parameters

params

mode7 structure

jo_init_mode7_for_image_output()

bool jo_init_mode7_for_image_output	(	jo_mode7 *	params,
		const unsigned short	tile_width,
		const unsigned short	tile_height,
		jo_img *const	output_image
	)

Initialize mode 7 effect for image output and pre compute projection.

Parameters

params	mode7 structure
tile_width	Tile width
tile_height	Tile height
output_image	Output image (data can be allocated before)

Returns

true if successful otherwise false (use jo_get_last_error())

jo_init_mode7_for_screen_output()

bool jo_init_mode7_for_screen_output	(	jo_mode7 *const	params,
		const unsigned short	tile_width,
		const unsigned short	tile_height
	)

Initialize mode 7 effect for direct screen output and pre compute projection.

Parameters

params	mode7 structure
tile_width	Tile width
tile_height	Tile height

Returns

true if successful otherwise false (use jo_get_last_error())

jo_update_screen_output_coord_for_mode7()

void jo_update_screen_output_coord_for_mode7

(

jo_mode7 *const

params

)

Update mode 7 computation if output_left or output_right params changed.

Parameters

params

mode7 structure