void initialize_pong_game(){
unsigned i;
clear_screen();
for (i=0;i<ROW_SIZE;i++){
video_buffer[i+TOP_BORDER*ROW_SIZE]=0xff;
video_buffer[i+ROW_SIZE*BOTTOM_BORDER]=0xff;
}
for (i=TOP_BORDER+1;i<(BOTTOM_BORDER-1);i++){
if (i&1) video_buffer[ROW_SIZE*i+3]=1u;
}
running=0;
score[LEFT_PLAYER]=0;
score[RIGHT_PLAYER]=0;
server=winner;
winner=NO_WINNER;
paddle[LEFT_PLAYER]=read_pot(LEFT_PLAYER)+TOP_BORDER;
paddle[RIGHT_PLAYER]=read_pot(RIGHT_PLAYER)+TOP_BORDER;
if (server==LEFT_PLAYER){
ball.x=LEFT_BORDER+1;
ball.y=paddle[LEFT_PLAYER]+1;
}else{
ball.x=RIGHT_BORDER-1;
ball.y=paddle[RIGHT_PLAYER]+1;
}
ball.dx=0;
ball.dy=0;
write_score(LEFT_PLAYER,score[LEFT_PLAYER]);
write_score(RIGHT_PLAYER,score[RIGHT_PLAYER]);
draw_paddle(LEFT_PLAYER,WHITE);
draw_paddle(RIGHT_PLAYER,WHITE);
plot(ball.x,ball.y,WHITE);
srand(frame_cntr);
}//f()
// attend que le joueur déplace sa raquette
void wait_service(){
int y;
paddle[server]=read_pot(server)+TOP_BORDER;
while (1){
y=read_pot(server)+TOP_BORDER;
if (y<paddle[server]-1 || y>paddle[server]+1) break;
move_paddle(1-server);// l'autre joueur peut se déplacer en attendant le service.
}
ball.dy=rand()%3 - 1;
if (server==LEFT_PLAYER){
ball.dx=1;
}else{
ball.dx=-1;
}
ball.skip=rand()%2;
}//f()
// déplace la raquette du joueur
void move_paddle(int player){
int new_y;
new_y=read_pot(player)+TOP_BORDER;
if (new_y!=paddle[player]){
draw_paddle(player, HIDE);
paddle[player]=new_y;
draw_paddle(player,SHOW);
}
}//f()
uint8_t read_mode(void)
{
uint8_t pot_reading = read_pot();
if (pot_reading > ((3 * MAX_POT_VALUE) / 4))
return MODE_NORMAL;
if (pot_reading > (MAX_POT_VALUE / 2))
return MODE_SILENT;
if (pot_reading > (MAX_POT_VALUE / 4))
return MODE_HARD;
return MODE_FREE_PLAY;
}
