/**
* Zufallspositionsgenerator mit Überprüfung.
* Liefert eine Zufällige Position innerhalb des Spielfeldes,
* jedoch *nicht* auf der Schlange drauf.
* @return liefert eine zufällige Position zurück
*/
location randomize_food()
{
location food;
do
{
food = randomize_location();
}
while(check_snake_collision(food));
return food;
}
void game_run()
{
int x, y, a, b, c;
unsigned short padbuf;
while(speed_counter > 0)
{
scc++;
if(vibration_cntdown > 0)
{
printf("vibration = %d\n", vibration_cntdown);
pad_enable_vibration(0);
pad_set_vibration(0, 0xFF, 0x80);
vibration_cntdown--;
if(vibration_cntdown == 0)
pad_set_vibration(0, 0, 0);
}
PSX_ReadPad(&padbuf, NULL);
if(scc == 5 && !game_over)
{
if(snake_dir <= SNAKE_DIR_RIGHT)
{
if(padbuf & PAD_UP)
snake_dir = SNAKE_DIR_UP;
if(padbuf & PAD_DOWN)
snake_dir = SNAKE_DIR_DOWN;
}
else
{
if(padbuf & PAD_LEFT)
snake_dir = SNAKE_DIR_LEFT;
if(padbuf & PAD_RIGHT)
snake_dir = SNAKE_DIR_RIGHT;
}
for(y = 0; y < 29; y++)
for(x = 0; x < 40; x++)
{
if(snake_array[y][x] == snake_size)
{
switch(snake_dir)
{
case SNAKE_DIR_LEFT:
b = y;
a = x-1;
break;
case SNAKE_DIR_RIGHT:
b = y;
a = x+1;
break;
case SNAKE_DIR_UP:
b = y-1;
a = x;
break;
case SNAKE_DIR_DOWN:
b = y+1;
a = x;
break;
}
c = check_snake_collision(a,b);
if(c)
{
snake_array[b][a] = snake_size+1;
if(c==2)
{
snake_size++;
score+=100;
//printf("%d\n", score);
SsKeyOn(2);
new_apple();
}
}
else
{
vibration_cntdown = 10;
game_over = 1;
SsKeyOff(0);
SsKeyOn(1);
scc = 0;
}
if(snake_array[y][x] == 1 && c!=2)
snake_array[y][x] = 0;
goto out_of_collision_checking;
}
}
out_of_collision_checking:
for(y = 0; y < 29; y++)
for(x = 0; x < 40; x++)
if(snake_array[y][x]&&snake_array[y][x]<0x80&&c!=2)
snake_array[y][x]--;
scc = 0;
}
else if(game_over)
{
scc++;
if(scc >= 510)
{
if((padbuf & PAD_CROSS) && !cross_pressed)
{
game_setup();
cross_pressed = 1;
}
else if((padbuf & PAD_CIRCLE) && !circle_pressed)
{
circle_pressed = 1;
GsSetVideoMode(320, 240, pal_or_ntsc_selection());
game_setup();
}
if(!(padbuf & PAD_CROSS))
cross_pressed = 0;
if(!(padbuf & PAD_CIRCLE))
circle_pressed = 0;
}
}
speed_counter--;
}
if(screen_old)
{
game_rect.x = 0;
game_rect.y = 0;
game_rect.w = 320;
game_rect.h = 240;
game_rect.r = 0;
game_rect.g = 0;
game_rect.b = 0;
game_rect.attribute = 0;
GsSortRectangle(&game_rect);
game_sprite.x = 0;
game_sprite.y = 0;
game_sprite.w = 256;
game_sprite.h = 240;
game_sprite.u = 0;
game_sprite.v = 0;
game_sprite.r = NORMAL_LUMINOSITY;
game_sprite.g = NORMAL_LUMINOSITY;
game_sprite.b = NORMAL_LUMINOSITY;
game_sprite.tpage = 5;
game_sprite.attribute = COLORMODE(COLORMODE_16BPP);
GsSortSimpleSprite(&game_sprite);
game_sprite.x += 256;
game_sprite.w = 64;
game_sprite.tpage = 9;
GsSortSimpleSprite(&game_sprite);
game_rect.w = 8;
game_rect.h = 8;
game_rect.attribute = ENABLE_TRANS | TRANS_MODE(0);
for(y = 0; y < 29; y++)
{
for(x = 0; x < 40; x++)
{
game_rect.x = x * 8;
game_rect.y = y * 8;
if(snake_array[y][x] >= 1 && snake_array[y][x] <= 0x7F)
{
game_rect.r = 0;
game_rect.g = 255;
game_rect.b = 0;
GsSortRectangle(&game_rect);
}
else if(snake_array[y][x] == 0x80)
{
game_rect.r = 255;
game_rect.g = 0;
game_rect.b = 255;
GsSortRectangle(&game_rect);
}
else if(snake_array[y][x] == 0x81)
{
game_rect.r = 0;
game_rect.g = 0;
game_rect.b = 128;
GsSortRectangle(&game_rect);
}
}
}
sprintf(string_buf, "SCORE: %d", score);
game_print(string_buf, 0, 232);
if(game_over)
{
game_rect.w = 320;
game_rect.h = 240;
game_rect.x = 0;
game_rect.y = 0;
if(scc<=255)x=scc;else x=255;
game_rect.r = x;
game_rect.g = x;
game_rect.b = x;
game_rect.attribute = ENABLE_TRANS|TRANS_MODE(2);
GsSortRectangle(&game_rect);
if(scc>=300)
{
game_center_print("GAME OVER!", 160, 120);
}
if(scc>=420)
game_center_print("WHAT DO YOU WANT TO DO NOW?", 160, 136);
if(scc>=450)
game_center_print("PRESS X TO RESTART THE GAME.",160, 152);
if(scc>=480)
game_center_print("PRESS O FOR PAL/NTSC SELECTION SCREEN.",160,168);
if(scc>=510)
game_center_print("MADE WITH PSXSDK BY GIUSEPPE GATTA, 2010", 160, 200);
}
GsDrawList();
// While the graphic synthesizer (video card) is drawing
// just sleep.
while(GsIsDrawing());
// Swap drawing and display Y position, and swap list array
// to use. In this way we achieve a double buffer.
if(game_dispenv.y == 0)
{
game_dispenv.y = 256;
game_drawenv.y = 0;
}
else
{
game_dispenv.y = 0;
game_drawenv.y = 256;
}
GsSetDispEnv(&game_dispenv);
GsSetDrawEnv(&game_drawenv);
screen_old = 0;
}
}
