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Update 'src/include/globals.asm'

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villadelfia 2023-10-18 02:00:02 +00:00
parent 0c8ed9c424
commit 1f7f17a353
1 changed files with 22 additions and 17 deletions
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39
src/include/globals.asm
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@ -6,32 +6,37 @@ INCLUDE "hardware.inc"
INCLUDE "structs.asm" INCLUDE "structs.asm"
; Waits for VRAM to be safe to access. (Includes hblank.) ; PPU modes:
; - 0: HBlank
; - 1: VBlank
; - 2: OAM Scan
; - 3: Drawing
; Waits for PPU mode to be 0 or 1.
; We don't wait for 2 because it's super short and impractical to do much of anything in.
MACRO wait_vram MACRO wait_vram
.waitvram\@ ld hl, rSTAT
ldh a, [rSTAT] : bit 1, [hl]
and STATF_BUSY jr nz, :-
jr nz, .waitvram\@
ENDM ENDM
; Waits for lcd to be in vblank. ; Waits for PPU mode to be at the start of mode 1.
; We do this by checking for scanline 144.
MACRO wait_vblank MACRO wait_vblank
.waitvb\@ ld b, 144
ldh a, [rSTAT] : ldh a, [rLY]
and STATF_LCD cp a, b
cp STATF_VBL jr nz, :-
jr nz, .waitvb\@
ENDM ENDM
; Waits for lcd to not be in vblank. ; Waits for PPU mode to be at the end of mode 1.
; We do this by checking for scanline 0.
MACRO wait_vblank_end MACRO wait_vblank_end
.waitvbe\@ : ldh a, [rLY]
ldh a, [rSTAT] jr nz, :-
and STATF_LCD
cp STATF_VBL
jr z, .waitvbe\@
ENDM ENDM