diff options
Diffstat (limited to 'src/home/empty_screen.asm')
| -rw-r--r-- | src/home/empty_screen.asm | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/home/empty_screen.asm b/src/home/empty_screen.asm new file mode 100644 index 0000000..060f19e --- /dev/null +++ b/src/home/empty_screen.asm @@ -0,0 +1,39 @@ +; initialize the screen by emptying the tilemap. used during screen transitions +EmptyScreen: ; 04a2 (0:04a2) + call DisableLCD + call FillTileMap + xor a + ld [wDuelDisplayedScreen], a + ld a, [wConsole] + cp CONSOLE_SGB + ret nz + call EnableLCD + ld hl, AttrBlkPacket_EmptyScreen + call SendSGB + call DisableLCD + ret + +AttrBlkPacket_EmptyScreen: ; 04bf (0:04bf) + sgb ATTR_BLK, 1 ; sgb_command, length + db 1 ; number of data sets + ; Control Code, Color Palette Designation, X1, Y1, X2, Y2 + db ATTR_BLK_CTRL_INSIDE + ATTR_BLK_CTRL_LINE, 0 << 0 + 0 << 2, 0, 0, 19, 17 ; data set 1 + ds 6 ; data set 2 + ds 2 ; data set 3 + +; returns v*BGMap0 + BG_MAP_WIDTH * c + b in de. +; used to map coordinates at bc to a BGMap0 address. +BCCoordToBGMap0Address: ; 04cf (0:04cf) + ld l, c + ld h, $0 + add hl, hl + add hl, hl + add hl, hl + add hl, hl + add hl, hl + ld c, b + ld b, HIGH(v0BGMap0) + add hl, bc + ld e, l + ld d, h + ret |