gbdk-2020 | GameBoy Development Kit |
| download: https://git.y1.nz/archives/gbdk.tar.gz | |
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gbdk-lib/libc/targets/sm83/get_bk_t.s
1 .include "global.s"
2
3 .area _HOME
4
5 _get_bkg_tiles::
6 PUSH BC
7
8 LDA HL,4(SP) ; Skip return address and registers
9 LD A,(HL+) ; D = x
10 LD D, A
11 LD E,(HL) ; E = y
12 LDA HL,9(SP)
13 LD A,(HL-) ; BC = tiles
14 LD B, A
15 LD A,(HL-)
16 LD C, A
17 LD A,(HL-) ; A = h
18 LD H,(HL) ; H = w
19 LD L,A ; L = h
20
21 CALL .get_xy_btt
22
23 POP BC
24 RET
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