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44 lines
835 B
44 lines
835 B
include "sdk/hardware.inc"
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SECTION "gbsdk_oam_memory", WRAM0, ALIGN[8]
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_shadow_oam:: ; OAM Memory is for 40 sprites with 4 bytes per sprite
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wShadowOAM::
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ds 40 * 4
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.end:
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SECTION "gbsdk_oam_init_function", ROMX, BANK[1]
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oamInit::
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_oam_init::
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ld hl, wShadowOAM
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xor a
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ld c, wShadowOAM.end - wShadowOAM
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: ld [hl+], a
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dec c
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jr nz, :-
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ld hl, hOAMCopyRoutine
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ld de, oamCopyRoutine
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ld c, hOAMCopyRoutine.end - hOAMCopyRoutine
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: ld a, [de]
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inc de
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ld [hl+], a
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dec c
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jr nz, :-
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; We directly copy to clear the initial OAM memory, which else contains garbage.
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jp hOAMCopyRoutine
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oamCopyRoutine:
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LOAD "hram", HRAM
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_oam_dma_copy::
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hOAMCopyRoutine::
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ld a, HIGH(wShadowOAM)
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ldh [rDMA], a
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ld a, $28
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.wait:
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dec a
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jr nz, .wait
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ret
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.end:
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ENDL
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