sms_fill_rect_compat.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/sms_fill_rect_compat.s

      1         .include        "global.s"
      2 
      3         .globl  .set_tile_map_xy
      4 
      5         .area   _HOME
      6 
      7 ; void fill_rect_compat(uint8_t x, uint8_t y, uint8_t w, uint8_t h, const uint16_t tile) __z88dk_callee __preserves_regs(iyh, iyl);
      8 _fill_rect_compat::
      9         pop hl          ; HL = ret
     10         pop bc          ; BC = YX
     11         pop de          ; DE = WH
     12         ex (sp), hl     ; HL = data
     13         ex de, hl       ; HL = WH, DE = data
     14 
     15         ld a, b
     16         ld b, d
     17 
     18         add #.SCREEN_Y_OFS
     19         ld d, a
     20         xor a
     21         FAST_MOD8 d #28
     22         ld d, a
     23 
     24         ld a, c
     25         add #.SCREEN_X_OFS
     26         and #0x1f
     27         ld c, e
     28         ld e, a         ; BC = data, DE = YX
     29 
     30         jp .fill_rect_xy_compat

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gbdk-2020