cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

set_tile.s (1136B)

      1.include "global.s"
      2
      3.area _CODE
      4
      5_set_vram_byte::
      6        ; de = addr, hl = &t
      7        ldhl    sp,#2
      8        ld      a,(hl+)
      9        ld      e, a
     10        ld      a,(hl+)
     11        ld      d, a
     12
     13        WAIT_STAT
     14
     15        ; Write tile
     16        ld      a,(hl)
     17        ld      (de),a
     18        ret
     19
     20_set_win_tile_xy::
     21        ldh     a,(.LCDC)
     22        and     #LCDCF_WIN9C00
     23        jr      z,.is98
     24        jr      .is9c
     25_set_bkg_tile_xy::
     26        ldh     a,(.LCDC)
     27        and     #LCDCF_BG9C00
     28        jr      nz,.is9c
     29.is98:
     30        ld      d,#0x98         ; DE = origin
     31        jr      .set_tile_xy
     32.is9c:
     33        ld      d,#0x9C         ; DE = origin
     34
     35.set_tile_xy:
     36        push    bc
     37        ldhl    sp,#4
     38
     39        ld      a, (hl+)
     40        ld      b, a
     41        ld      a, (hl+)
     42
     43        ld      e, d
     44        swap    a
     45        rlca
     46        ld      c, a
     47        and     #0x03
     48        add     e
     49        ld      d, a
     50        ld      a, #0xE0
     51        and     c
     52        add     b
     53        ld      e, a            ; dest DE = BASE + 0x20 * Y + X
     54
     55        WAIT_STAT
     56        ld      a, (hl)
     57        ld      (de), a
     58
     59        pop     bc
     60        ret