Reduction

Macros
#define	VDP2_SCRN_REDUCTION_STEP   FIX16(1.0 / 256.0)
	Not yet documented.
#define	VDP2_SCRN_REDUCTION_MIN   VDP2_SCRN_REDUCTION_STEP
	Not yet documented.
#define	VDP2_SCRN_REDUCTION_MAX   FIX16(7.0)
	Not yet documented.

Typedefs
typedef enum vdp2_scrn_reduction	vdp2_scrn_reduction_t
	Not yet documented.

Enumerations
enum	vdp2_scrn_reduction
	Not yet documented. More...

Functions
void	vdp2_scrn_reduction_set (vdp2_scrn_t scroll_screen, vdp2_scrn_reduction_t reduction)
	Not yet documented.
void	vdp2_scrn_reduction_x_set (vdp2_scrn_t scroll_screen, fix16_t scale)
	Not yet documented.
void	vdp2_scrn_reduction_y_set (vdp2_scrn_t scroll_screen, fix16_t scale)
	Not yet documented.
void	vdp2_scrn_reduction_xy_set (vdp2_scrn_t scroll_screen, const fix16_vec2_t *scale)
	Not yet documented.

Detailed Description

Description goes here.

Limitations for NBG0/NBG1 reduction:

+--------+-----+-----------+------------+
| Screen | CCC | Reduction | No display |
+--------+-----+-----------+------------+
| NBG0   | 16  | 1/2       | None       |
|        |     +-----------+------------+
|        |     | 1/4       | NBG2       |
|        +-----+-----------+------------+
|        | 256 | 1/2       | NBG2       |
+--------+-----+-----------+------------+
| NBG1   | 16  | 1/2       | None       |
|        |     +-----------+------------+
|        |     | 1/4       | NBG3       |
|        +-----+-----------+------------+
|        | 256 | 1/2       | NBG3       |
+--------+-----+-----------+------------+

The coord. increment should be a value smaller then 1 to zoom in and larger than 1 to zoom out. No zoom means equal to 1.

Range limitations:

Range (X or Y)	Reduction results	CCC
[0,1)	Reduction in	16
		256
1	No reduction	16
(1,2]	Reduction out (1/2)	16
		256
(1,7]	Reduction out (1/7)	16

Enumeration Type Documentation

vdp2_scrn_reduction

enum vdp2_scrn_reduction

Not yet documented.

Enumerator
VDP2_SCRN_REDUCTION_NONE	No reduction.
VDP2_SCRN_REDUCTION_HALF	1/2 reduction
VDP2_SCRN_REDUCTION_QUARTER	1/4 reduction

Function Documentation

vdp2_scrn_reduction_set()

void vdp2_scrn_reduction_set	(	vdp2_scrn_t	scroll_screen,
		vdp2_scrn_reduction_t	reduction
	)

Not yet documented.

Parameters

scroll_screen
reduction

vdp2_scrn_reduction_x_set()

void vdp2_scrn_reduction_x_set	(	vdp2_scrn_t	scroll_screen,
		fix16_t	scale
	)

Not yet documented.

Parameters

scroll_screen
scale

vdp2_scrn_reduction_y_set()

void vdp2_scrn_reduction_y_set	(	vdp2_scrn_t	scroll_screen,
		fix16_t	scale
	)

Not yet documented.

Parameters

scroll_screen
scale

vdp2_scrn_reduction_xy_set()

void vdp2_scrn_reduction_xy_set	(	vdp2_scrn_t	scroll_screen,
		const fix16_vec2_t *	scale
	)

Not yet documented.

Parameters

	scroll_screen
[in]	scale