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212 lines
2.9 KiB
212 lines
2.9 KiB
INCLUDE "hardware.inc"
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INCLUDE "util.inc"
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SECTION "Header", ROM0[$100]
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_entry:
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di
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jp start
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rept $150 - _entry
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db 0
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endr
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SECTION "Frame", WRAM0
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frame:: db
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SECTION "VBlank", ROM0[$40]
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handle_vblank:
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reti
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SECTION "Code", ROM0
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start:
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ld hl, rLCDC
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res 7, [hl]
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res 2, [hl]
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ld hl, rIE
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ld [hl], IEF_VBLANK
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call OAM_Init
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; call Keys_Init
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; call Player_Init
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ld hl, intro_Data
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call Map_Load
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; set palette
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ld a, %11100100
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ld hl, rOBP0
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ld [hl], a
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ld hl, rBGP
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ld [hl], a
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; enable lcd, sprites and interrupts
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ld hl, rLCDC
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set 7, [hl]
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set 1, [hl]
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ei
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.loop:
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ld hl, frame
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inc [hl]
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call Keys_Update
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; Clear pending map state
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xor a
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ld [PENDING_ROW_PTR], a
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ld [PENDING_ROW_PTR + 1], a
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ld [PENDING_COL_PTR], a
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ld [PENDING_COL_PTR + 1], a
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call scroll_update
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; wait for vblank
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halt
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call Map_Update
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; ~160 cycles
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ld a, HIGH(_OAM)
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call DMA_Start
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jp .loop
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; TODO: remove once scrolling is implemented
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scroll_update:
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; scroll map with arrow keys
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ld a, [keys]
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and PADF_UP
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jr z, .down
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; don't scroll up if on last tile
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ld hl, rSCY
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ld a, [hl]
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and %111
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jr nz, .update_up
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ld hl, CURRENT_CAMERA_Y
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ld a, [hl]
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or a
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ret z
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.update_up:
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ld hl, rSCY
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dec [hl]
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ld a, [hl]
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and %111
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cp %111
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jr nz, .update_up_map
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ld a, [CURRENT_CAMERA_Y]
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dec a
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ld [CURRENT_CAMERA_Y], a
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.update_up_map:
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call Map_Scroll
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ret
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.down:
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ld a, [keys]
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and PADF_DOWN
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jr z, .right
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; don't scroll down if on last tile
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ld a, [rSCY]
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and %111
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jr nz, .update_down
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ld a, [CURRENT_MAP_HEIGHT]
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ld b, a
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ld a, [CURRENT_CAMERA_Y]
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add 18
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cp b
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ret z
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.update_down:
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ld hl, rSCY
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inc [hl]
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ld a, [hl]
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and %111
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jr nz, .update_down_map
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ld a, [CURRENT_CAMERA_Y]
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inc a
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ld [CURRENT_CAMERA_Y], a
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.update_down_map:
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call Map_Scroll
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ret
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.right:
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ld a, [keys]
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and PADF_RIGHT
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jr z, .left
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; don't scroll right if on last tile
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ld hl, rSCX
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ld a, [hl]
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and %111
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jr nz, .update_right
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ld a, [CURRENT_MAP_WIDTH]
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ld b, a
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ld a, [CURRENT_CAMERA_X]
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add SCRN_X_B
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cp b
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ret z
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.update_right:
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ld hl, rSCX
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inc [hl]
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ld a, [hl]
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and %111
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jr nz, .update_right_map
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ld a, [CURRENT_CAMERA_X]
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inc a
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ld [CURRENT_CAMERA_X], a
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.update_right_map:
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call Map_Scroll
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ret
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.left:
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ld a, [keys]
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and PADF_LEFT
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ret z
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; don't scroll left if on last tile
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ld hl, rSCX
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ld a, [hl]
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and %111
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jr nz, .update_left
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ld hl, CURRENT_CAMERA_X
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ld a, [hl]
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or a
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ret z
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.update_left:
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ld hl, rSCX
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dec [hl]
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ld a, [hl]
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and %111
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cp %111
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jr nz, .update_left_map
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ld a, [CURRENT_CAMERA_X]
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dec a
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ld [CURRENT_CAMERA_X], a
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.update_left_map:
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call Map_Scroll
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ret
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