Display registers

Dispalay area adjust / Hardware scroll. More...

Collaboration diagram for Display registers:

Enumerations
enum	vdp_yjk_mode { VDP_RGB = 0x00 , VDP_YJK = 0x08 , VDP_YJK_RGB = 0x18 }
	MSX2+ Enumeration of V9958 VDP's color space. More...

Functions
void	vdp_set_adjust (int8_t x, int8_t y)
	MSX2 Set VDP display adjust register.
void	vdp_set_vscroll (uint8_t y)
	MSX2 Set VDP vertical display offset register.
void	vdp_set_hscroll (uint16_t x)
	MSX2+ Set VDP horizontal display offset register.
void	vdp_set_hscroll_mask (bool enable)
	MSX2+ Enables/Disables the screen mask for the leftmost 8 pixels.
void	vdp_set_hscroll_dual_page (bool enable)
	MSX2+ Enable/disable horizontal scrolling for two pages.
void	vdp_set_yjk_mode (enum vdp_yjk_mode yjk)
	MSX2+ Set V9958 VDP's color space to RGB, YJK, or YJK/RGB.

Detailed Description

Dispalay area adjust / Hardware scroll.

Enumeration Type Documentation

vdp_yjk_mode

enum vdp_yjk_mode

MSX2+ Enumeration of V9958 VDP's color space.

VDP_RGB can be used to reset to default color space for each screen mode.

VDP_YJK and VDP_YJK_RGB are supposed to use with GRAPHIC 7 screen mode, and not with any other screen mode.

See also

vdp_set_yjk_mode()

Enumerator
VDP_RGB	Default color space of the V9958 (same as the V9938). In case of GRAPHIC 7 screen mode: 256 colors 3-bits per pixel of R component (0..7) 3-bits per pixel of G component (0..7) 2-bits per pixel of B component (0..3) Pre-defined 16 colors for sprites. No color palette. Any other screen mode: According to colors for each screen mode.
VDP_YJK	YJK mode. In case of GRAPHIC 7 screen mode: 19,268 colors 5-bits per pixel of Y component (0..31) 6-bits per 4-pixels of J component (-32..+31) 6-bits per 4-pixels of K component (-32..+31) 16 colors out of 512 colors (color palette) for sprites. Any other screen mode: Not supposed to use with.
VDP_YJK_RGB	YJK / RGB mixed mode. In case of GRAPHIC 7 screen mode: 12,499 colors 4-bits per pixel of Y component (0..15) 6-bits per 4-pixels of J component (-32..+31) 6-bits per 4-pixels of K component (-32..+31) or 16 colors out of 512 colors (color palette). 16 colors out of 512 colors (color palette) for sprites. Any other screen mode: Not supposed to use with.

Definition at line 518 of file vdp.h.

Function Documentation

vdp_set_adjust()

void vdp_set_adjust	(	int8_t	x,
		int8_t	y
	)

MSX2 Set VDP display adjust register.

• If x < 0, shift the display area to left.
• If x > 0, shift the display area to right.
• If y < 0, shift the display area to upper.
• If y > 0, shift the display area to lower.

Parameters

x	x offset (-7..+8)
y	y offset (-7..+8)

vdp_set_vscroll()

void vdp_set_vscroll

(

uint8_t

y

)

MSX2 Set VDP vertical display offset register.

Parameters

y	vertical offset. (0..255)

vdp_set_hscroll()

void vdp_set_hscroll

(

uint16_t

x

)

MSX2+ Set VDP horizontal display offset register.

Parameters

x	horizontal offset (0..511)

vdp_set_hscroll_mask()

void vdp_set_hscroll_mask

(

bool

enable

)

MSX2+ Enables/Disables the screen mask for the leftmost 8 pixels.

Parameters

enable

Hide the leftmost 8 pixels if true, show otherwise.

vdp_set_hscroll_dual_page()

void vdp_set_hscroll_dual_page

(

bool

enable

)

MSX2+ Enable/disable horizontal scrolling for two pages.

Parameters

enable

scrolling two pages if true, one page otherwise.

vdp_set_yjk_mode()

void vdp_set_yjk_mode

(

enum vdp_yjk_mode

yjk

)

MSX2+ Set V9958 VDP's color space to RGB, YJK, or YJK/RGB.

Set / Reset YJK/YAE bit of V9958 VDP register R#25.

Affects GRAPHIC 7 screen mode color space and pixel format.

VDP_RGB can be used to reset to default color space for each screen mode.

VDP_YJK and VDP_YJK_RGB are supposed to use with GRAPHIC 7 screen mode, and not with any other screen mode.

Parameters

yjk	color space