gbdk-2020 | GameBoy Development Kit |
| download: https://git.y1.nz/archives/gbdk.tar.gz | |
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gbdk-lib/libc/targets/sm83/set_win_tile_submap.s
1 .include "global.s"
2
3 .globl .image_tile_width, .set_xy_win_submap
4
5 .area _HOME
6
7 _set_win_submap::
8 ldhl sp, #2
9 ld a, (hl+) ; b = x
10 ld b, a
11 ld c, (hl) ; c = y
12
13 ldhl sp, #8
14 ld a, (hl)
15 ldhl sp, #4
16 sub (hl)
17 ld (.image_tile_width), a ; .image_tile_width contains corrected width map width
18 add (hl)
19
20 ld d, #0
21 ld e, a
22 ld a, c
23 MUL_DE_BY_A_RET_HL
24 ld a, b
25 ADD_A_REG16 h, l
26 ld d, h
27 ld e, l
28
29 ldhl sp, #6
30 ld a,(hl+)
31 ld h,(hl)
32 ld l,a
33 add hl, de
34 ld b, h
35 ld c, l
36
37 ldhl sp, #2
38 ld a, (hl+) ; d = x
39 and #0x1f
40 ld d, a
41 ld a, (hl) ; e = y
42 and #0x1f
43 ld e, a
44
45 ldhl sp, #5
46 ld a,(hl-) ; a = h
47 ld h,(hl) ; h = w
48 ld l,a ; l = h
49
50 jp .set_xy_win_submap
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