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millfork/examples/x16/balls.mfk
2020-05-01 15:19:25 +02:00

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// the emulator supports only 16 sprites:
const byte SPRITE_COUNT = 16
array(vera_sprite_data) sprites[SPRITE_COUNT]
array(sbyte) vx[SPRITE_COUNT]
array(sbyte) vy[SPRITE_COUNT]
import random
void main () {
pointer.vera_sprite_data p
byte i,j
word x,y
init_rand_seed()
// make balls striped
for i,0,parallelto,$1f {
for j,1,parallelto,$f {
sprite_bitmap[nonet(j<<5) + i] *= j
}
}
for i,0,paralleluntil,SPRITE_COUNT {
p = sprites[i].pointer
// bitmap is at $10000:
p->address = $800
p->x.lo = rand()
p->x.hi = rand() & 1
p->y = rand()
// no collision, above all layers, no flipping
p->ctrl0 = $c
// 32×32 pixels, different palette offsets
p->ctrl1 = $a0 | (i & $f)
vx[i] = 1 - (rand() & 2)
vy[i] = 1 - (rand() & 2)
}
vera_upload_large($10000, sprite_bitmap.addr, sizeof(sprite_bitmap))
vera_upload_large(VERA_SPRITES, sprites.addr, sizeof(sprites))
// enable sprites:
vera_set_sprites_enable(true)
while true {
for i,0,paralleluntil,SPRITE_COUNT {
p = sprites[i].pointer
x = p->x
y = p->y
x += vx[i]
y += vy[i]
p->x = x
p->y = y
if x == 0 { vx[i] = 1 }
if x >= 640-32 { vx[i] = 0-1 }
if y == 0 { vy[i] = 1 }
if y >= 480-32 { vy[i] = 0-1 }
}
vera_upload_large(VERA_SPRITES, sprites.addr, sizeof(sprites))
}
}
array sprite_bitmap = [
$00,$00,$00,$00,$00,$00,$11,$11,$11,$11,$00,$00,$00,$00,$00,$00,
$00,$00,$00,$00,$01,$11,$11,$11,$11,$11,$11,$10,$00,$00,$00,$00,
$00,$00,$00,$01,$11,$11,$11,$11,$11,$11,$11,$11,$10,$00,$00,$00,
$00,$00,$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,$00,$00,
$00,$00,$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,$00,$00,
$00,$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,$00,
$00,$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,$00,
$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,
$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,
$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,
$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,
$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,
$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,
$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,
$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,
$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,
$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,
$00,$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,$00,
$00,$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,$00,
$00,$00,$01,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$10,$00,$00,
$00,$00,$00,$11,$11,$11,$11,$11,$11,$11,$11,$11,$11,$00,$00,$00,
$00,$00,$00,$01,$11,$11,$11,$11,$11,$11,$11,$11,$10,$00,$00,$00,
$00,$00,$00,$00,$01,$11,$11,$11,$11,$11,$11,$10,$00,$00,$00,$00,
$00,$00,$00,$00,$00,$00,$11,$11,$11,$11,$00,$00,$00,$00,$00,$00
]