void AnimUpdateTile(AnimTile *a, int *t, int *f, graphic_t *gptr, u8 *tmem)
{
(*t)++;
if( (*t) > a->freq[(*f)])
{
(*t) = 0;
if( (*f) < a->len - 1)
{
(*f)++;
}
else
{
(*f) = 0;
}
swiCopy(gptr->tileEntries+(a->ID[(*f)]*4)*64, tmem + a->ID[0]*4*64, 32);
swiCopy(gptr->tileEntries+(a->ID[(*f)]*4+1)*64, tmem + (a->ID[0]*4+1)*64, 32);
swiCopy(gptr->tileEntries+(a->ID[(*f)]*4+2)*64, tmem + (a->ID[0]*4+2)*64, 32);
swiCopy(gptr->tileEntries+(a->ID[(*f)]*4+3)*64, tmem + (a->ID[0]*4+3)*64, 32);
}
}
//create a sprite with a random position, speed, and size
void randomSprite(mySprite* s) {
//pick a random color index
u8 c = rand() % 256;
//two pixels at a time
u16 color = c | (c << 8);
//create a randomly oriented sprite going off in a random direction
createSprite(s, rand() % 256, rand() % 192, 0, sizes[(rand() % 12)], SpriteColorFormat_256Color, rand() % 4 - 2, rand() % 4 - 2);
//dont let sprites get stuck with 0 velocity
if(s->dx == 0 && s->dy == 0) {
s->dx = rand() % 3 + 1;
s->dy = rand() % 3 + 1;
}
//the size (in pixels) is encoded in the low 12 bits of the Size attribute (shifted left by 5)
//we load new graphics each time as this is as much a test of my allocator as an example of api usage
if(s->gfx) {
swiCopy(&color, s->gfx, ((s->size & 0xFFF) << 4) | COPY_MODE_FILL);
} else {
s->alive = false;
}
}
