2019-06-14 08:36:52 +00:00
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INCLUDE "hardware.inc"
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INCLUDE "game/game.asm"
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INCLUDE "tools.asm"
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2019-06-18 09:08:14 +00:00
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SECTION "InterruptVblank", ROM0[$0040]
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reti
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SECTION "InterruptLCDC", ROM0[$0048]
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reti
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SECTION "InterruptTimer_Overflow", ROM0[$0050]
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reti
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SECTION "InterruptSerial", ROM0[$0058]
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reti
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SECTION "Interruptp1thru4", ROM0[$0060]
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reti
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2019-06-14 08:36:52 +00:00
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SECTION "Header", ROM0[$100]
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2019-06-21 13:34:11 +00:00
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; Game code starts here
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; $0100
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2019-06-18 09:08:14 +00:00
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ei ; Simple nop ; di ; Disable interrupts for now
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2019-06-14 08:36:52 +00:00
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jp Start ; Leave this tiny space
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2019-06-21 13:34:11 +00:00
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; $0104 - Nintendo logo
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db $CE,$ED,$66,$66,$CC,$0D,$00,$0B,$03,$73,$00,$83,$00,$0C,$00,$0D
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db $00,$08,$11,$1F,$88,$89,$00,$0E,$DC,$CC,$6E,$E6,$DD,$DD,$D9,$99
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db $BB,$BB,$67,$63,$6E,$0E,$EC,$CC,$DD,$DC,$99,$9F,$BB,$B9,$33,$3E
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; $0134 - Game Title
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db "GAMEBOYGAME", $00, $00, $00, $00, $00
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; $0144 - New Licensee code
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db $00, $00
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; $0146 - SGB Flag
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db $00
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; $0147 - Cartridge Type (http://gbdev.gg8.se/wiki/articles/The_Cartridge_Header#0147_-_Cartridge_Type)
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db $00
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; $0148 - ROM Size (http://gbdev.gg8.se/wiki/articles/The_Cartridge_Header#0148_-_ROM_Size)
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db $00 ; 32 KByte
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; $0149 - RAM Size
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db $00
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; $014A - Destination Code
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db $01
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; $014B - Old Licensee code
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db $33
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; $014C - Mask ROM Version number
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db $00
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; $014D - $014F - Checksums
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db $00, $00, $00
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2019-06-14 08:36:52 +00:00
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SECTION "Intro code", ROM0
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Start:
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; First step is to access the VRAM to insert our graphics data.
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; To do so, we must wait until we are in VBLANK period.
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; Loop until we find ourselves in VBLANK
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; Turn off the LCD
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.waitVBlank
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2019-06-18 09:08:14 +00:00
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ld a, $01
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ld [$FFFF], a ; Force enable VBLANK Interrupt
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halt
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2019-06-14 08:36:52 +00:00
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xor a ; ld a, 0 ; Reset the accumilator register
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; Our target is to set bit 7 reset on the LDC to turn it off
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ld [rLCDC], a ; We will have to write to LCDC again later, so it's not a bother, really.
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; ----------- Font Begin copying to VRAM -----------
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; Start copying our font to vram
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2019-06-18 09:08:14 +00:00
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ld de, Page1 ; The start of the font tiles
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2019-06-14 08:36:52 +00:00
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ld hl, $9000 ; Set registers hl to $9000 which is the beginning of vram
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2019-06-18 09:08:14 +00:00
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ld bc, Page1End - Page1 ; The total length of font tiles
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2019-06-14 08:36:52 +00:00
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call Memcpy
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; ----------- Start the display -----------
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; Init the display register
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ld a, %11100100 ; Load the palette of white, light gray, dark gray, black
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ld a, %00011011 ; Load the palette of white, light gray, dark gray, black
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ld [rBGP], a ; Store the palette to display
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xor a ; ld a, 0 ; Reset the accumilator
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ld [rSCY], a ; Set our scroll Y position to 0
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ld [rSCX], a ; Set our scroll X position to 0
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ld [rNR52], a ; Turn off sound
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2019-06-19 15:07:02 +00:00
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ld a, 7
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ld [rWX], a
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2019-06-21 12:04:17 +00:00
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ld a, SCRN_Y
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2019-06-19 15:07:02 +00:00
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ld [rWY], a
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; Initialize other stuff
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2019-06-21 12:55:47 +00:00
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call InitTools
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2019-06-21 12:04:17 +00:00
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call InitController
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2019-06-19 15:07:02 +00:00
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call InitWindow
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2019-06-21 12:55:47 +00:00
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; Reset OAM memory with zeros
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; First reset our shadow OAM
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ld hl, shadow_oam ; Set position of OAM Ram to hl
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ld a, 0 ; Fill that memory space with zero
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ld b, shadow_oam_inuse - shadow_oam ; Get the full size of the fill
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call Memfill
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; Then call our OAM guy
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call RunDMA
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2019-06-14 08:36:52 +00:00
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; Turn the screen on, display background
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2019-06-19 15:07:02 +00:00
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ld a, LCDCF_ON|LCDCF_BGON|LCDCF_WINON|LCDCF_WIN9C00
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2019-06-14 08:36:52 +00:00
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ld [rLCDC], a ; Set the screen flags
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2019-06-19 15:07:02 +00:00
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call WaitVBlank
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2019-06-14 08:36:52 +00:00
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jp GameLoop
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SECTION "Font", ROM0
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2019-06-18 09:08:14 +00:00
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Page1:
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INCBIN "assets/page1.chr"
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Page1End:
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2019-06-14 08:36:52 +00:00
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