shithub: pokecrystal

ref: 7350c3708fc2463e1eb6024c03de5c85b50aa38f
dir: /macros/code.asm/

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; Syntactic sugar macros

lb: MACRO ; r, hi, lo
	ld \1, (\2 & $ff) << 8 + (\3 & $ff)
	ENDM

ln: MACRO ; r, hi, lo
	ld \1, (\2 & $f) << 4 + (\3 & $f)
	ENDM

ldpixel: MACRO
if _NARG >= 5
	lb \1, \2 * 8 + \4, \3 * 8 + \5
else
	lb \1, \2 * 8, \3 * 8
endc
endm

depixel EQUS "ldpixel de,"
bcpixel EQUS "ldpixel bc,"


; Design patterns

jumptable: MACRO
	ld a, [\2]
	ld e, a
	ld d, 0
	ld hl, \1
	add hl, de
	add hl, de
	ld a, [hli]
	ld h, [hl]
	ld l, a
	jp hl
endm

; Many mobile functions were dummied out in localization.
mobile EQUS "ret"

maskbits: macro
; example usage in rejection sampling:
; .loop
; 	call Random
; 	maskbits 30
; 	cp 30
; 	jr nc, .loop
x = 1
rept 8
IF \1 > x
x = (x + 1) * 2 +- 1
ENDC
endr
	and x
endm