void main(void)
{
ppu_on_all();//enable rendering
//set initial coords
cat_x[0]=52;
cat_y[0]=100;
cat_x[1]=180;
cat_y[1]=100;
//init other vars
touch=0;//collision flag
frame=0;//frame counter
//now the main loop
while(1)
{
ppu_waitnmi();//wait for next TV frame
//flashing color for touch
i=frame&1?0x30:0x2a;
pal_col(17,touch?i:0x21);//set first sprite color
pal_col(21,touch?i:0x26);//set second sprite color
//process players
spr=0;
for(i=0;i<2;++i)
{
//display metasprite
spr=oam_meta_spr(cat_x[i],cat_y[i],spr,!i?metaCat1:metaCat2);
//poll pad and change coordinates
pad=pad_poll(i);
if(pad&PAD_LEFT &&cat_x[i]> 0) cat_x[i]-=2;
if(pad&PAD_RIGHT&&cat_x[i]<232) cat_x[i]+=2;
if(pad&PAD_UP &&cat_y[i]> 0) cat_y[i]-=2;
if(pad&PAD_DOWN &&cat_y[i]<212) cat_y[i]+=2;
}
//check for collision for a smaller bounding box
//metasprite is 24x24, collision box is 20x20
if(!(cat_x[0]+22< cat_x[1]+2 ||
cat_x[0]+ 2>=cat_x[1]+22||
cat_y[0]+22< cat_y[1]+2 ||
cat_y[0]+ 2>=cat_y[1]+22)) touch=1; else touch=0;
frame++;
}
}
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 title_screen(void)
{
scroll(-8,240);//title is aligned to the color attributes, so shift it a bit to the right
unrle_vram(title_nam,0x2000);
vram_adr(0x2800);//clear second nametable, as it is visible in the jumping effect
vram_fill(0,1024);
pal_bg(palTitle);
pal_bright(4);
ppu_on_bg();
delay(20);//delay just to make it look better
iy=240<<FP_BITS;
dy=-8<<FP_BITS;
frame_cnt=0;
wait=160;
bright=4;
while(1)
{
ppu_waitnmi();
scroll(-8,iy>>FP_BITS);
if(pad_trigger(0)&PAD_START) break;
iy+=dy;
if(iy<0)
{
iy=0;
dy=-dy>>1;
}
if(dy>(-8<<FP_BITS)) dy-=2;
if(wait)
{
--wait;
}
else
{
pal_col(2,(frame_cnt&32)?0x0f:0x20);//blinking press start text
++frame_cnt;
}
}
void delay(unsigned char time)
{
for(wait=0;wait<time;++wait) ppu_waitnmi();
}
