void main(void)
{
pal_spr(palSprites);//set palette for sprites
oam_size(0);
ppu_on_all();//enable rendering
//initialize balls parameters
for(i=0;i<BALLS_MAX;++i)
{
//starting coordinates
ball_x[i]=rand8();
ball_y[i]=rand8();
//direction bits
j=rand8();
//horizontal speed -3..-3, excluding 0
spr=1+(rand8()%3);
ball_dx[i]=j&1?-spr:spr;
//vertical speed
spr=1+(rand8()%3);
ball_dy[i]=j&2?-spr:spr;
}
//now the main loop
while(1)
{
ppu_waitnmi();//wait for next TV frame
spr=0;
for(i=0;i<BALLS_MAX;++i)
{
//set a sprite for current ball
spr=oam_spr(ball_x[i],ball_y[i],0x40,i&3,spr);//0x40 is tile number, i&3 is palette
//move the ball
ball_x[i]+=ball_dx[i];
ball_y[i]+=ball_dy[i];
//bounce the ball off the edges
if(ball_x[i]>=(256-8)) ball_dx[i]=-ball_dx[i];
if(ball_y[i]>=(240-8)) ball_dy[i]=-ball_dy[i];
}
}
}
void main(void) {
//set palette for sprites
pal_spr(palSprites);
// set background color to black
pal_col(0, 0x0f);
//enable rendering
ppu_on_all();
//initialize invader parameters
for(i=0;i<INVADERS_MAX;++i) {
//starting coordinates
invader_x[i]=rand8();
invader_y[i]=rand8();
//direction bits
j=rand8();
//horizontal speed -3..-3, excluding 0
spr=1+(rand8()%3);
invader_dx[i]=j&1?-spr:spr;
//vertical speed
spr=1+(rand8()%3);
invader_dy[i]=j&2?-spr:spr;
}
//the main loop
while(1) {
//wait for next TV frame
ppu_wait_frame();
spr=0;
for(i=0;i<INVADERS_MAX;++i) {
//set a sprite for current invader
spr=oam_spr(invader_x[i],invader_y[i],0x40,i&3,spr);//0x40 is tile number, i&3 is palette
//move the invader
invader_x[i]+=invader_dx[i];
invader_y[i]+=invader_dy[i];
//bounce the invader off the edges
if(invader_x[i]>=(256-8)) invader_dx[i]=-invader_dx[i];
if(invader_y[i]>=(240-8)) invader_dy[i]=-invader_dy[i];
}
}
}
