cscg22-gearboy

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

msx_set_1bpp_sprite_data.s (864B)

      1        .include        "global.s"
      2
      3        .title  "VRAM utilities"
      4        .module VRAMUtils
      5
      6        .ez80
      7
      8        .area   _HOME
      9
     10; void set_sprite_1bpp_data(uint16_t start, uint16_t ntiles, const void *src) __z88dk_callee;
     11_set_sprite_1bpp_data::
     12        pop af
     13        pop hl
     14        pop iy
     15        pop de
     16        push af
     17
     18        add hl, hl
     19        add hl, hl
     20        add hl, hl
     21
     22        ld bc, #.VDP_SPRDATA0
     23        add hl, bc
     24
     25        DISABLE_VBLANK_COPY        ; switch OFF copy shadow SAT
     26
     27        VDP_WRITE_CMD h, l
     28
     29        ex de, hl
     30
     31        ld d, iyh
     32        ld e, iyl
     33
     34        ld c, #.VDP_DATA
     35        inc d
     36        inc e
     37        jr 2$
     381$:
     39        ld b, #8
     403$:        
     41        outi
     42        jr nz, 3$
     432$:
     44        dec e
     45        jr  nz, 1$
     46
     47        dec d
     48        jr nz, 1$
     49
     50        ENABLE_VBLANK_COPY         ; switch ON copy shadow SAT
     51
     52        ret