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116 lines
1.7 KiB
116 lines
1.7 KiB
include "sdk/hardware.inc"
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SECTION "gbsdk_video_functions", ROM0
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_lcd_off::
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: ldh a, [rLY]
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cp 144
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jr c, :-
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xor a
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ldh [rLCDC], a
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ret
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_vram_memcpy::
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ld hl, sp + 7
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ld a, [hl-]
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ld d, a
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ld a, [hl-]
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ld e, a
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or a, d
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ret z
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; size -> de
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push bc
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ld a, [hl-]
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ld b, a
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ld a, [hl-]
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ld c, a
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ld a, [hl-]
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ld l, [hl]
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ld h, a
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; src -> bc, dst -> hl, size -> de
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inc d
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inc e
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jr .start
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.copy_loop:
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ldh a, [rSTAT]
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and a, STATF_BUSY
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jr nz, .copy_loop
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ld a, [bc]
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ld [hl+], a
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inc bc
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.start:
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dec e
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jr nz, .copy_loop
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dec d
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jr nz, .copy_loop
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pop bc
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ret
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_vram_memset::
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ld hl, sp + 6
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ld a, [hl-]
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ld d, a
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ld a, [hl-]
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ld e, a
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or a, d
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ret z
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; size -> de
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push bc
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ld a, [hl-]
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ld c, a
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ld a, [hl-]
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ld l, [hl]
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ld h, a
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; value -> c, dst -> hl, size -> de
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inc d
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inc e
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jr .start
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.copy_loop:
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ldh a, [rSTAT]
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and a, STATF_BUSY
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jr nz, .copy_loop
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ld a, c
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ld [hl+], a
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.start:
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dec e
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jr nz, .copy_loop
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dec d
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jr nz, .copy_loop
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pop bc
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ret
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IF CGB
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_cgb_background_palette::
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pop de
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pop hl
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push hl
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push de
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ld a, BCPSF_AUTOINC
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ldh [rBCPS], a
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ld e, 8*4*2
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: ld a, [hl+]
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ldh [rBCPD], a
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dec e
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jr nz, :-
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ret
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_cgb_object_palette::
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pop de
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pop hl
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push hl
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push de
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ld a, OCPSF_AUTOINC
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ldh [rOCPS], a
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ld e, 8*4*2
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: ld a, [hl+]
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ldh [rOCPD], a
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dec e
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jr nz, :-
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ret
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ENDC
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