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millfork/examples/gb/gbtest.mfk
2019-04-30 00:41:42 +02:00

251 lines
5.6 KiB
Plaintext

// compile with -t gb_small
import gb_hardware
import gb_joy
import stdio
array oam_buffer[$a0] align(256)
sbyte sprite_direction
byte old_a
void on_vblank(){
flush_putchar_buffer()
sprite_dma(oam_buffer.addr.hi)
oam_buffer[1] += sprite_direction
react_to_input()
if oam_buffer[1] == 160 { sprite_direction = -1 }
if oam_buffer[1] == 8 { sprite_direction = 1 }
}
void on_lcdc(){
}
void on_timer(){
}
void on_serial(){
}
void on_joypad(){
}
void react_to_input() {
read_joy()
if old_a == 0 && input_a != 0 { // A button
sprite_direction = 0 - sprite_direction
low_c()
}
old_a = input_a
if input_dy < 0 { // Up button
if oam_buffer[0] > 16 { oam_buffer[0] -= 1}
}
if input_dy > 0 { // Down button
if oam_buffer[0] < 152 { oam_buffer[0] += 1}
}
}
void low_c() {
}
void high_c() {
}
void main() {
byte i
for i,0,paralleluntil,$a0 {
oam_buffer[i] = 0
}
reg_obj0_palette = 0q2222
load_charset()
init_putchar()
reg_lcd_ctrl = lcd_tile_8000 | lcd_bg_on | lcd_obj_on | lcd_win_off | lcd_map_9800
enable_lcd()
enable_irq()
putstrz("HELLO WORLD"z)
new_line()
sprite_direction = 1
oam_buffer[0] = 50
oam_buffer[1] = 8
oam_buffer[2] = '@'
oam_buffer[3] = 0
while(true){}
}
void load_charset() {
pointer s
pointer d
s = charset.addr
d = $8200
while s < charset.addr + $300 {
d[0] = s[0]
d += 1
d[0] = s[0]
d += 1
s += 1
}
}
const array charset = [
$00,$00,$00,$00,$00,$00,$00,$00,
$18,$18,$18,$18,$00,$00,$18,$00,
$66,$66,$66,$00,$00,$00,$00,$00,
$66,$66,$FF,$66,$FF,$66,$66,$00,
$18,$3E,$60,$3C,$06,$7C,$18,$00,
$62,$66,$0C,$18,$30,$66,$46,$00,
$3C,$66,$3C,$38,$67,$66,$3F,$00,
$06,$0C,$18,$00,$00,$00,$00,$00,
$0C,$18,$30,$30,$30,$18,$0C,$00,
$30,$18,$0C,$0C,$0C,$18,$30,$00,
$00,$66,$3C,$FF,$3C,$66,$00,$00,
$00,$18,$18,$7E,$18,$18,$00,$00,
$00,$00,$00,$00,$00,$18,$18,$30,
$00,$00,$00,$7E,$00,$00,$00,$00,
$00,$00,$00,$00,$00,$18,$18,$00,
$00,$03,$06,$0C,$18,$30,$60,$00,
$3C,$66,$6E,$76,$66,$66,$3C,$00,
$18,$18,$38,$18,$18,$18,$7E,$00,
$3C,$66,$06,$0C,$30,$60,$7E,$00,
$3C,$66,$06,$1C,$06,$66,$3C,$00,
$06,$0E,$1E,$66,$7F,$06,$06,$00,
$7E,$60,$7C,$06,$06,$66,$3C,$00,
$3C,$66,$60,$7C,$66,$66,$3C,$00,
$7E,$66,$0C,$18,$18,$18,$18,$00,
$3C,$66,$66,$3C,$66,$66,$3C,$00,
$3C,$66,$66,$3E,$06,$66,$3C,$00,
$00,$00,$18,$00,$00,$18,$00,$00,
$00,$00,$18,$00,$00,$18,$18,$30,
$0E,$18,$30,$60,$30,$18,$0E,$00,
$00,$00,$7E,$00,$7E,$00,$00,$00,
$70,$18,$0C,$06,$0C,$18,$70,$00,
$3C,$66,$06,$0C,$18,$00,$18,$00,
$3C,$66,$6E,$6E,$60,$62,$3C,$00,
$18,$3C,$66,$7E,$66,$66,$66,$00,
$7C,$66,$66,$7C,$66,$66,$7C,$00,
$3C,$66,$60,$60,$60,$66,$3C,$00,
$78,$6C,$66,$66,$66,$6C,$78,$00,
$7E,$60,$60,$78,$60,$60,$7E,$00,
$7E,$60,$60,$78,$60,$60,$60,$00,
$3C,$66,$60,$6E,$66,$66,$3C,$00,
$66,$66,$66,$7E,$66,$66,$66,$00,
$3C,$18,$18,$18,$18,$18,$3C,$00,
$1E,$0C,$0C,$0C,$0C,$6C,$38,$00,
$66,$6C,$78,$70,$78,$6C,$66,$00,
$60,$60,$60,$60,$60,$60,$7E,$00,
$63,$77,$7F,$6B,$63,$63,$63,$00,
$66,$76,$7E,$7E,$6E,$66,$66,$00,
$3C,$66,$66,$66,$66,$66,$3C,$00,
$7C,$66,$66,$7C,$60,$60,$60,$00,
$3C,$66,$66,$66,$66,$3C,$0E,$00,
$7C,$66,$66,$7C,$78,$6C,$66,$00,
$3C,$66,$60,$3C,$06,$66,$3C,$00,
$7E,$18,$18,$18,$18,$18,$18,$00,
$66,$66,$66,$66,$66,$66,$3C,$00,
$66,$66,$66,$66,$66,$3C,$18,$00,
$63,$63,$63,$6B,$7F,$77,$63,$00,
$66,$66,$3C,$18,$3C,$66,$66,$00,
$66,$66,$66,$3C,$18,$18,$18,$00,
$7E,$06,$0C,$18,$30,$60,$7E,$00,
$3C,$30,$30,$30,$30,$30,$3C,$00,
$0C,$12,$30,$7C,$30,$62,$FC,$00,
$3C,$0C,$0C,$0C,$0C,$0C,$3C,$00,
$00,$18,$3C,$7E,$18,$18,$18,$18,
$00,$10,$30,$7F,$7F,$30,$10,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
]
// the following is an experimental implementation of text output for Game Boy
// if it matures, it might get mainlined into the standard distribution
array putchar_buffer[256]
byte putchar_buffer_start
byte putchar_buffer_size
byte putchar_column
byte putchar_row
volatile byte putchar_lock
void init_putchar() {
putchar_buffer_start = 0
putchar_buffer_size = 0
putchar_column = 0
putchar_row = 0
putchar_lock = 0
}
asm void putchar(byte e) {
ld a,(putchar_buffer_size)
cp $ff
jr nz, __putchar_do
halt
jr putchar
__putchar_do:
ld b,a
ld a,1
ld (putchar_lock),a
ld a,(putchar_buffer_start)
add a,b
ld c,a
ld b,0
ld hl,putchar_buffer.addr
add hl,bc
ld (hl),e
ld hl,putchar_buffer_size.addr
inc (hl)
xor a
ld (putchar_lock),a
ret
}
// TODO: ???
noinline pointer calculate_cursor() {
pointer p
p = putchar_column
p <<= 5
p += putchar_row
p += $9800
return p
}
void new_line() {
putchar(13)
putchar(10)
}
void flush_putchar_buffer() {
pointer dest
pointer src
if putchar_lock != 0 { return }
if putchar_buffer_size == 0 { return }
src = putchar_buffer.addr + putchar_buffer_start
dest = calculate_cursor()
byte i
byte c
for i,0,paralleluntil,putchar_buffer_size {
c = src[0]
src += 1
if c == 13 {
putchar_column = 0
dest.lo &= $E0
} else if c == 10 {
putchar_row += 1
dest += 32
} else {
dest[0] = c
dest += 1
putchar_column += 1
if putchar_column == 20 {
putchar_column = 0
putchar_row += 1
dest.lo &= $E0
dest += 32
}
}
}
putchar_buffer_start += putchar_buffer_size
putchar_buffer_size = 0
}