msx_set_tile_map.s

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gbdk-2020	GameBoy Development Kit
	download: https://git.y1.nz/archives/gbdk.tar.gz
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gbdk-lib/libc/targets/z80/msxdos/msx_set_tile_map.s

      1         .include        "global.s"
      2 
      3         .title  "VRAM utilities"
      4         .module VRAMUtils
      5 
      6         .globl  .set_tile_map_xy
      7 
      8         .area   _HOME
      9 
     10 ; void set_tile_map(uint8_t x, uint8_t y, uint8_t w, uint8_t h, const uint8_t *tiles) __z88dk_callee __preserves_regs(iyh, iyl);
     11 _set_tile_map::
     12         pop hl          ; HL = ret
     13         pop bc          ; BC = YX
     14         pop de          ; DE = WH
     15         ex (sp), hl     ; HL = data
     16         ex de, hl       ; HL = WH, DE = data
     17 
     18         xor a
     19         FAST_MOD8 b #.VDP_MAP_HEIGHT
     20 
     21         ld b, d
     22         ld d, a
     23 
     24         ld a, c
     25         ld c, e
     26         ld e, a         ; BC = data, DE = YX
     27 
     28         jp .set_tile_map_xy
     29

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gbdk-2020