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gbdemo.asm
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gbdemo.asm
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; =============================================================================
; Gameboy DEMO
; (C) by Jens Ch. Restemeier, <XXXXXXXXXXXX>
; =============================================================================
#include "gameboy.inc"
lorambase = 0c0a0h ; some space for the sprite-table
hirambase = 0ff80h
#DEFINE LOBYTEVAR(X) X = lorambase \lorambase .set (lorambase + 1)
#DEFINE HIBYTEVAR(X) X = hirambase \hirambase .set (hirambase + 1)
#DEFINE LOWORDVAR(X) X = lorambase \lorambase .set (lorambase + 2)
#DEFINE HIWORDVAR(X) X = hirambase \hirambase .set (hirambase + 2)
; == variables in hi-ram ==
HIBYTEVAR(GB_VERSION)
HIBYTEVAR(JOY_TIPP)
HIBYTEVAR(JOY_HOLD)
HIBYTEVAR(OLD_JOY_HOLD)
HIWORDVAR(IRQ_HANDLER)
HIBYTEVAR(SEM_VBLANK)
HIBYTEVAR(SCREEN)
HIBYTEVAR(EN_SOUND)
HIBYTEVAR(EN_COLOR)
HIBYTEVAR(HAS_COLOR)
; all variables for the sound-player
HIWORDVAR(VOICE_1)
HIBYTEVAR(DUR_1)
HIWORDVAR(VOICE_2)
HIBYTEVAR(DUR_2)
HIWORDVAR(VOICE_3)
HIBYTEVAR(DUR_3)
HIBYTEVAR(PLAY_VOICES)
; variables for APA-demonstration
; rotation-angle
HIBYTEVAR(rot)
; matrix
HIBYTEVAR(m00)
HIBYTEVAR(m01)
HIBYTEVAR(m10)
HIBYTEVAR(m11)
HIBYTEVAR(x1)
HIBYTEVAR(y1)
HIBYTEVAR(x2)
HIBYTEVAR(y2)
HIBYTEVAR(radius)
HIBYTEVAR(color)
HIBYTEVAR(xc)
HIBYTEVAR(yc)
HIBYTEVAR(i1)
HIBYTEVAR(i2)
HIBYTEVAR(sx)
HIBYTEVAR(sy)
HIWORDVAR(d)
; some screens need a "slow-down" counter
HIBYTEVAR(speed)
; variables for S_FLI.INC
HIBYTEVAR(tabidx)
HIWORDVAR(textpos)
; variables for the printer driver
HIWORDVAR(crc)
HIBYTEVAR(stat_1)
HIBYTEVAR(stat_2)
; variables for the tiny game
HIBYTEVAR(xpos)
HIBYTEVAR(hpos)
HIBYTEVAR(heli_x)
HIBYTEVAR(heli_y)
HIWORDVAR(g_points)
; variables for paradroid-game
HIBYTEVAR(lsig)
HIBYTEVAR(rsig)
; allocate some memory for the SGB packet-buffer
sgb_packet = lorambase
lorambase .set (lorambase + 16)
; allocate some memory for the projected points
t_points = lorambase
lorambase .set (lorambase + 256)
; == end of variables ==
vblank_address = hirambase ; last item in hiram is the Sprite-DMA function
; == constants: ==
; gameboy versions:
UNKNOWN = 0
CLASSIC_GAMEBOY = 1
SUPER_GAMEBOY = 2
POCKET_GAMEBOY = 3
COLOR_GAMEBOY = 4
; =============================================================================
.org 0
; Try "TYPE GBDEMO.GB" to see this:
.text "GameBoy DEMO"
; This is: LF, CR, EOF
.byte 00ah,00dh,01ah
; =============================================================================
.org 020h
; =============================================================================
; Wait for VBL - destroys AF. To be called with "rst 20h"
; =============================================================================
ldh a,(LCDC & 0FFh)
bit 7,a
ret z
waitvbl: ldh a,(LCDC & 0FFh) ; Wait for VBL
add a,a
ret nc
notyet: ldh a,(LY & 0FFh)
cp 90h
jr nz,$-4
ret
; = IRQ vectors =
.org 040h ; VBlank IRQ
; jump to where we copied the DMA-function to...
jp vblank_address
.org 048h ; LCDC Status IRQ
; all FLI-effects are done here:
jr s_irq
.org 050h ; Timer Owerflow IRQ
reti
.org 058h ; Serial Transfer Completion IRQ
reti ; Do nothing
.org 060h ; Joypad action (?) IRQ
reti ; Do nothing
; Irqs done..
.org 070h
bitmask:
; A table for a index-to-bitmask translation
; The address (070h) is hardcoded
.byte 080h,040h,020h,010h,008h,004h,002h,001h,000h
.org 080h
; A table for a fast conversion from a nibble to a hex char
hextable:
.byte "0123456789ABCDEF"
.org 090h
; A table with cosinus values
cos_table:
.byte 64, 62, 59, 53, 45, 35, 24, 12, 0, -12, -24, -35, -45, -53, -59, -62
.byte -64, -62, -59, -53, -45, -35, -24, -12, 0, 12, 24, 35, 45, 53, 59, 62
; - Additional IRQ functions ----------------------------------------------
; indirect FLI function
s_irq:
push af
push bc
push de
push hl
call sub_irq ; put adr of irq-exit on stack
pop hl
pop de
pop bc
pop af
reti
sub_irq: ld hl,IRQ_HANDLER
ldi a,(hl)
ld d,a
ld a,(hl)
ld e,a
push de ; push handler-address on stack
ret
; = Gameboy Header ============================================================
.org 100h
nop
jp start
.byte $CE,$ED,$66,$66,$CC,$0D,$00,$0B,$03,$73,$00,$83 ; Nintendo Logo
.byte $00,$0C,$00,$0D,$00,$08,$11,$1F,$88,$89,$00,$0E
.byte $DC,$CC,$6E,$E6,$DD,$DD,$D9,$99,$BB,$BB,$67,$63
.byte $6E,$0E,$EC,$CC,$DD,$DC,$99,$9F,$BB,$B9,$33,$3E
.byte "GAMEBOY DEMO " ; Cart name 14bytes
.byte 080h ; Color GB
.word 0FFFFh ; No Vendor
.byte 003h ; Super GB functions
.byte 0 ; Cart type ROM Only
.byte 0 ; ROM Size 32k
.byte 0 ; RAM Size 0k
.byte 0 ; destination: non-japanese
.byte 033h ; Maker ID -> new scheme
.byte 1 ; Version
.byte 0FFh ; Complement check
.word 0ffffh ; Cheksum
; =============================================================================
; == startup code ==
start: di
; init stack
ld sp,0fffeh
; let's find out, what kind of GB we have
; first the easy stuff: GB Color and GB pocket
cp 011h
jr nz, no_CGB
ld a, COLOR_GAMEBOY
jr gb_found
no_CGB: cp 0FFh
jr nz, no_PGB
ld a, POCKET_GAMEBOY
jr gb_found
no_PGB: cp 001h
jr nz, no_GB
; to distinguish Super GB and classic GB try a MLT_REQ
call clear_packet
ld a,010001001b ; MLT_REQ
ld (sgb_packet),a
ld a,000000011b ; request 5 players
ld (sgb_packet+1),a
call send_packet
ld a, 030h
ldh (P1 & 0FFh), a
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
and 00fh
cp 00fh
jr nz, sgb_found
ld a, 000h
ldh (P1 & 0FFh), a
ld a, 030h
ldh (P1 & 0FFh), a
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
ldh a, (P1 & 0FFh)
and 00fh
cp 00fh
jr nz, sgb_found
ld a, CLASSIC_GAMEBOY
jr gb_found
sgb_found:
; we don't need 5-player mode, disable it again
ld a,010001001b
ld (sgb_packet),a
ld a,000000000b ; no request
ld (sgb_packet+1),a
call send_packet
ld a, SUPER_GAMEBOY
jr gb_found
no_GB: ld a, UNKNOWN
gb_found: ld (GB_VERSION),a ; store GB-version
; clear ram
ld hl, 0C000h
ld de, 02000h
clear_ram: xor a
ldi (hl),a
dec de
ld a,d
or e
jp nz,clear_ram
; clear hiram, except GB-version
ld c, 081h
ld d, 07Eh
clear_hiram: xor a
ld (c),a
inc c
dec d
jp nz, clear_hiram
; copy vblank handler into hiram
ld c,(vblank_address & 0FFh)
ld hl,vblank_start
ld de,(vblank_stop-vblank_start)
copy_func: ldi a,(hl)
ld (c),a
inc c
dec de
ld a,d
or e
jr nz, copy_func
call default_init
ld hl, text_font ; install the text-font
ld de, 09000h
ld bc, 128*8*2
call copy_nv
; init configuration
ld a,1
ldh (EN_SOUND & 0FFh),a ; enable sound
ldh (HAS_COLOR & 0FFh),a
ldh (EN_COLOR & 0FFh),a ; enable color (if present)
ld a,(GB_VERSION)
cp COLOR_GAMEBOY ; Is it a GB-Color ?
jr z, gb_color
; ... no time to support SGB-color ...
; cp SUPER_GAMEBOY ; Is it a Super-GB ?
; jr z, gb_color
ld a,0 ; all other cases: color n/a
ldh (HAS_COLOR & 0FFh),a
ldh (EN_COLOR & 0FFh),a
gb_color:
call display_on
call init_sound
ei ; let's go !
restart: ; set start-screen
ld a,0
ldh (SCREEN & 0FFh),a
; == main loop ==
main:
call readjoy
ldh a, (JOY_HOLD & 0FFh) ; check for start+select+a+b=reset
cp 00fh
jr z, restart
call dispatch ; execute slice of the game
sleep: halt ; save engergy
nop ; avoid hlt-bug
ld a,(SEM_VBLANK) ; The only IRQ we want is VBLANK
or a
jr z,sleep
xor a
ld (SEM_VBLANK),a
jr main
; =============================================================================
; Execute one slice of the game. Could be extended to switch banks
; =============================================================================
dispatch:
ldh a,(SCREEN & 0FFh)
sla a
ld hl,jump_table
add a,l
ld l,a
ld a,h
adc a,0
ldi a,(hl)
ld c,a
ld a,(hl)
ld b,a
push bc
nothing: ret
jump_table: .word drw_start ; 0
.word s1_start ; 1
.word s2_start ; 2
.word s3_start ; 3
.word drw_adr ; 4
.word s1_adr ; 5
.word drw_opt ; 6
.word s1_opt ; 7
.word s2_opt ; 8
.word s3_opt ; 9
.word s4_opt ; 10
.word drw_test ; 11
.word hnd_test ; 12
.word rdrw_test ; 13
.word drw_fli ; 14
.word s1_fli ; 15
.word s2_fli ; 16
.word s3_fli ; 17
.word drw_apa ; 18
.word s1_apa ; 19
.word s2_apa ; 20
.word s2_adr ; 21
.word drw_game ; 22
.word s1_game ; 23
.word s2_game ; 24
.word s3_game ; 25
.word drw_para ; 26
.word s1_para ; 27
.word nothing
; =============================================================================
; VBLANK IRQ-function, to be copied into HiRAM
; =============================================================================
vblank_start:
push af
ld a,1 ; set vblank semaphore
ldh (SEM_VBLANK & 0FFh),a
ld a,0c0h ; start sprite-DMA
ldh (SPRDMA & 0FFh),a
ld a,28h ; wait until DMA is over
dec a
jr nz,$-1
pop af
jp timer_irq
; reti
vblank_stop:
; =============================================================================
; Initialise GB into a known state
; =============================================================================
default_init:
ld hl, sprite_a ; install the sprites
ld de, 08000h
ld bc, 24*8*2
call copy_nv
xor a ; Misc standard init things..
ldh (STAT & 0FFh),a ; LCDC Status
ldh (SCX & 0FFh),a ; Screen scroll Y=0
ldh (SCY & 0FFh),a ; Screen scroll X=0
ld a, 0FFh
ldh (LYC & 0FFh), a ; LYC outside of used area
ldh (WX & 0FFh),a ; Window X - not visible
ldh (WY & 0FFh),a ; Window Y - not visible
call display_off
ld a,01000011b ; LCD Controller = Off (No picture on screen)
; WindowBank = $9C00
; Window = OFF
; BG Chr = $8800
; BG Bank= $9800
; OBJ = 8x8
; OBJ = On
; BG = On
ldh (LCDC & 0FFh),a
ld a,11100100b ; grey 3=11 (Black)
; grey 2=10 (Dark grey)
; grey 1=01 (Light grey)
; grey 0=00 (Transparent)
ldh (BGP & 0FFh),a ; background
ldh (OBP0 & 0FFh),a ; sprites a
ldh (OBP1 & 0FFh),a ; sprites b
ld a,000000000b ; disable all IRQ
ldh (IE & 0FFh),a
; install dummy-IRQ-handler
ld de, nothing
ld hl, IRQ_HANDLER
ld a, d
ldi (hl),a
ld a, e
ld (hl), e
ld a,000000001b ; enable VBLANK and Timer IRQ
ldh (IE & 0FFh),a
; hide/clear all sprites
ld c,09fh
xor a
ld hl, 0c000h
dil1: ldi (hl),a
dec c
jr nz, dil1
; set attributes to 0 (screen 1 and screen 2)
ld a, 1 ; switch to attribute RAM
ldh (VBK & 0FFh),a
ld hl, 09800h
ld bc, 0800h
xor a ; no atr/palette 0
call fill_nv
ld a, 0 ; switch to normala RAM
ldh (VBK & 0FFh),a
; clear bg map (screen 1 and screen 2)
ld hl, 09800h
ld bc, 0800h
xor a ; should be blank in a font
call fill_nv
ret
; =============================================================================
; Switch off LCD-display
; =============================================================================
display_off:
rst 20h ; wait for vbl
ld hl,LCDC
res 7,(hl) ; display off
res 1,(hl) ; bg off
res 0,(hl) ; ob off
ret
; =============================================================================
; Switch on LCD-display
; =============================================================================
display_on:
ld hl,LCDC
set 7,(hl) ; display on
set 1,(hl) ; bg on
set 0,(hl) ; ob on
ret
; =============================================================================
; wait for one frame
; =============================================================================
wait_frame: ldh a,(STAT & 0FFh) ; wait for vbl
and 3
cp 001b
jr nz, wait_frame
wf_l1: ldh a,(STAT & 0FFh) ; wait for vbl
and 3
cp 001b
jr z, wf_l1
ret
; =============================================================================
; Wait for a key
; =============================================================================
wait_key: call readjoy
ld a,(JOY_TIPP)
or a
jp z,wait_key
ret
; =============================================================================
; Read joypad
; =============================================================================
readjoy: ld a,020h ; read first nibble
ldh (JOYPAD & 0FFh),a
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
cpl
and 00fh
swap a
ld b,a
ld a,010h ; read second nibble
ldh (JOYPAD & 0FFh),a
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
ldh a,(JOYPAD & 0FFh)
cpl
and 00fh
or b ; combine them
ld c,a
ldh a,(JOY_HOLD & 0FFh)
ldh (OLD_JOY_HOLD & 0FFh),a
xor c
and c
ldh (JOY_TIPP & 0FFh),a
ld a,c
ldh (JOY_HOLD & 0FFh),a
ld a,030h
ldh (JOYPAD & 0FFh),a
ret
; =============================================================================
; copy bc, no wait for vblank
; =============================================================================
copy_nv:
ldi a,(hl)
ld (de),a
inc de
dec bc
ld a,b
or c
jr nz, copy_nv
ret
; =============================================================================
; copyz, waiting for vblank, hl=source, de=adr end='0'
; =============================================================================
copy_z:
ldh a,(STAT & 0FFh)
bit 1,a
jr nz,copy_z
ldi a,(hl)
or a
ret z
ld (de),a
inc de
jr copy_z
; =============================================================================
; Fill bc bytes from hl with a, no wait for vblank
; =============================================================================
fill_nv: ld d,a
f1_l1: ld a,d
ldi (hl),a
dec bc
ld a,b
or c
jp nz,f1_l1
ret
; =============================================================================
; Set attrib "box", position hl, width b, height c, d attrib
; =============================================================================
set_atr_box:
ld a, 1 ; switch to attribute RAM
ldh (VBK & 0FFh),a
sab_l2:
push bc
push hl
ld a,d
sab_l1: ldi (hl),a
dec b
jr nz, sab_l1
pop hl
ld bc,32
add hl,bc
pop bc
dec c
jr nz, sab_l2
ld a, 0
ldh (VBK & 0FFh),a
ret
; =============================================================================
; draw a nice border, position hl, width-4 b, height-4 c
; =============================================================================
draw_border:
; draw upper line
push hl
push bc
ld a, 1
ldi (hl),a
ld a, 3
ldi (hl),a
db_l1: ld a, 16
ldi (hl),a
dec b
ld a,b
or a
jr nz, db_l1
ld a, 5
ldi (hl),a
ld a, 4
ld (hl),a
pop bc
pop hl
ld de,32
add hl,de
; second line
push hl
push bc
ld a, 2
ldi (hl),a
ld a, 2
add a, b
add a, l
ld l,a
ld a,h
adc a,0
ld h,a
ld a, 6
ld (hl),a
pop bc
pop hl
ld de,32
add hl,de
db_l2: ; middle lines
push hl
push bc
ld a, 15
ldi (hl),a
ld a, 2
add a, b
add a, l
ld l,a
ld a,h
adc a,0
ld h,a
ld a, 13
ld (hl),a
pop bc
pop hl
ld de,32
add hl,de
dec c
ld a,c
or a
jr nz,db_l2
; one-before-last line
push hl
push bc
ld a, 12
ldi (hl),a
ld a, 2
add a, b
add a, l
ld l,a
ld a,h
adc a,0
ld h,a
ld a, 8
ld (hl),a
pop bc
pop hl
ld de,32
add hl,de
; draw last line
push hl
push bc
ld a, 10
ldi (hl),a
ld a, 11
ldi (hl),a
db_l3: ld a, 14
ldi (hl),a
dec b
ld a,b
or a
jr nz, db_l3
ld a, 9
ldi (hl),a
ld a, 7
ld (hl),a
pop bc
pop hl
ret
; =============================================================================
; setup background palette entry, hl=address, a=slot
; =============================================================================
set_bg_pal:
sla a ; entry-nr a*8
sla a
sla a
or 010000000b ; auto-increment, from 0
ldh (BCPS & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ldi a,(hl)
ldh (BCPD & 0FFh), a
ret
; =============================================================================
; setup object palette entry, hl=address, a=slot
; =============================================================================
set_ob_pal:
sla a ; entry-nr a*8
sla a
sla a
or 010000000b ; auto-increment, from 0
ldh (OCPS & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ldi a,(hl)
ldh (OCPD & 0FFh), a
ret
; =============================================================================
; set complete palette to gray
; =============================================================================
set_gray:
ld a,0
ld hl, gray_pal
call set_bg_pal
ld a,1
ld hl, gray_pal
call set_bg_pal
ld a,2
ld hl, gray_pal
call set_bg_pal
ld a,3
ld hl, gray_pal
call set_bg_pal
ld a,4
ld hl, gray_pal
call set_bg_pal
ld a,5
ld hl, gray_pal
call set_bg_pal
ld a,6
ld hl, gray_pal
call set_bg_pal
ld a,7
ld hl, gray_pal
call set_bg_pal
ld a,0
ld hl, gray_pal
call set_ob_pal
ld a,1
ld hl, gray_pal
call set_ob_pal
ld a,2
ld hl, gray_pal
call set_ob_pal
ld a,3
ld hl, gray_pal
call set_ob_pal
ld a,4
ld hl, gray_pal
call set_ob_pal
ld a,5
ld hl, gray_pal
call set_ob_pal
ld a,6
ld hl, gray_pal
call set_ob_pal
ld a,7
ld hl, gray_pal
call set_ob_pal
ret
; =============================================================================
; = a simple sound-player =
#include "SOUND.INC"
; = actions for start screen =
#include "S_START.INC"
; = actions for address screen =
#include "S_ADR.INC"
; = actions for options screen =
#include "S_OPT.INC"
; = actions for joypad test =
#include "S_TEST.INC"
; = actions for FLI demo =
#include "S_FLI.INC"
; = graphics demo =
#include "S_GBAPA.INC"
; = game =
#include "S_GAME.INC"
; = paradroid logic-game =
#include "S_PARA.INC"
; = super-gb utilities =
#include "SGB.INC"
; = GB-printer =
#include "PRINTER.INC"
; = Decompression of packed data =
;#include "DECOMP.INC"
; = text_strings =
#include "TEXT.INC"
; = some random data =
#include "RANDOM.INC"
; = game data =
; an 8x8 4-color font... nothing beautifull
#include "FONT.INC"
; a few ugly sprites
#include "SPRITES.INC"
; color_palettes
gray_pal:
.word 32767
.word 21140
.word 10570
.word 0
red_pal:
.word 32767
.word 21151
.word 10591
.word 31
gold_pal:
.word 32767
.word 1023
.word 11263
.word 21503
blue_pal:
.word 32767
.word 32404
.word 32074
.word 31744
; =============================================================================
; Single bank/second bank: check for ROM-overflow
#if ($ > 07FFFh)
ROM_OVERFLOW_ERROR
#endif
; First bank: check for bank-overflow
;#if ($ > 03FFFh)
; BANK_OVERFLOW_ERROR
;#endif
; =============================================================================
.end