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; wait for VBlankHandler to finish unless lcd is off
WaitForVBlank:
push hl
ld a, [wLCDC]
bit LCDC_ENABLE_F, a
jr z, .lcd_off
ld hl, wVBlankCounter
ld a, [hl]
.wait_vblank
halt
nop
cp [hl]
jr z, .wait_vblank
.lcd_off
pop hl
ret
; turn LCD on
EnableLCD:
ld a, [wLCDC] ;
bit LCDC_ENABLE_F, a ;
ret nz ; assert that LCD is off
or LCDC_ON ;
ld [wLCDC], a ;
ldh [rLCDC], a ; turn LCD on
ld a, FLUSH_ALL_PALS
ld [wFlushPaletteFlags], a
ret
; wait for vblank, then turn LCD off
DisableLCD:
ldh a, [rLCDC] ;
bit LCDC_ENABLE_F, a ;
ret z ; assert that LCD is on
ldh a, [rIE]
ld [wIE], a
res INT_VBLANK, a ;
ldh [rIE], a ; disable vblank interrupt
.wait_vblank
ldh a, [rLY] ;
cp LY_VBLANK ;
jr nz, .wait_vblank ; wait for vblank
ldh a, [rLCDC] ;
and LCDC_OFF ;
ldh [rLCDC], a ;
ld a, [wLCDC] ;
and LCDC_OFF ;
ld [wLCDC], a ; turn LCD off
xor a
ldh [rBGP], a
ldh [rOBP0], a
ldh [rOBP1], a
ld a, [wIE]
ldh [rIE], a
ret
; set OBJ size: 8x8
Set_OBJ_8x8:
ld a, [wLCDC]
and LCDC_OBJ8
ld [wLCDC], a
ret
; set OBJ size: 8x16
Set_OBJ_8x16:
ld a, [wLCDC]
or LCDC_OBJ16
ld [wLCDC], a
ret
; set Window Display on
SetWindowOn:
ld a, [wLCDC]
or LCDC_WINON
ld [wLCDC], a
ret
; set Window Display off
SetWindowOff:
ld a, [wLCDC]
and LCDC_WINOFF
ld [wLCDC], a
ret
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