//Main program
int main() {
/* Initialize SDL’s video system and check for errors */
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
printf("Unable to initialize SDL: %s\n", SDL_GetError());
return 1;
}
/* Make sure SDL_Quit gets called when the program exits! */
atexit(SDL_Quit);
/*set window title*/
SDL_WM_SetCaption("Essi Invaders", "P");
/* Attempt to set a 800x600 8 bit color video mode */
screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 8, SDL_DOUBLEBUF );
if (screen == NULL) {
printf("Unable to set video mode: %s\n", SDL_GetError());
return 1;
}
//load images
load_image("titlescreen.bmp", &title_screen, magenta);
load_image("cmap.bmp", &cmap, magenta);
load_image("target1.bmp", &invaders_img[0], magenta);
load_image("target2.bmp", &invaders_img[1], magenta);
load_image("target3.bmp", &invaders_img[2], magenta);
load_image("target4.bmp", &invaders_img[3], magenta);
load_image("target5.bmp", &invaders_img[4], magenta);
load_image("target6.bmp", &invaders_img[5], magenta);
load_image("target7.bmp", &invaders_img[6], magenta);
load_image("target8.bmp", &invaders_img[7], magenta);
load_image("target9.bmp", &invaders_img[8], magenta);
load_image("target10.bmp", &invaders_img[9], magenta);
load_image("target11.bmp", &invaders_img[10], magenta);
load_image("target12.bmp", &invaders_img[11], magenta);
load_image("spaceship.bmp", &player_img, magenta);
load_image("essi.bmp", &logo_img, magenta);
load_image("saucer.bmp", &saucer_img, magenta);
load_image("gameover.bmp", &game_over_img, magenta);
load_image("damage.bmp", &damage_img, lime);
load_image("damagetop.bmp", &damage_top_img, lime);
Uint32 next_game_tick = SDL_GetTicks();
int sleep = 0;
Uint8 *keystate = 0;
int quit = 0;
SDL_Event event;
init_score();
init_bases();
init_misil();
init_invaders();
init_player();
init_saucer();
init_bullets(bullets, P_BULLETS);
init_bullets(enemy_bullets, E_BULLETS);
state = menu;
title_time = SDL_GetTicks();
/* Animation */
while (quit == 0) {
/* Grab a snapshot of the keyboard. */
keystate = SDL_GetKeyState(NULL);
while (SDL_PollEvent(&event)) {
switch(event.type) {
case SDL_KEYDOWN:
switch( event.key.keysym.sym ) {
//exit out of game loop if escape is pressed
case SDLK_ESCAPE:
quit = 1;
break;
case SDLK_SPACE:
if (state == menu) {
state = game;
} else if (state == game){
player_shoot();
saucer_ai();
} else if (state == game_over) {
init_invaders();
init_bases();
init_score();
init_player();
state = game;
match = -1;
}
break;
default:
break;
}
break;
case SDL_KEYUP:
switch( event.key.keysym.sym ) {
case SDLK_UP:
move_misil(up);
break;
case SDLK_DOWN:
move_misil(down);
break;
default:
break;
}
}
}
draw_background();
if (state == menu) {
char s[] = "Press SPACEBAR to start";
SDL_Rect src[60];
int i;
if (title_time + 2000 < SDL_GetTicks()) {
src[0].x = (SCREEN_WIDTH/100)*30; //Yellow Background of Space Invaders
src[0].y = 40;
src[0].w = 440;
src[0].h = 230;
SDL_FillRect(screen, &src[0], 248);
} else {
int y = 0;
for (i = 0; i < 60; i++) {
src[i].x = 0;
src[i].y = y;
src[i].w = SCREEN_WIDTH;
src[i].h = 10;
SDL_FillRect(screen, &src[i], 227);
y += 10;
}
for (i = 0; i < 60; i++) {
SDL_FillRect(screen, &src[i], rand() % 255);
}
}
draw_title_screen();
draw_string(s, (SCREEN_WIDTH / 2) - (strlen(s) * 10), 500);
} else if (state == game) {
//move player
if (keystate[SDLK_LEFT]) {
move_player(left);
}
if (keystate[SDLK_RIGHT]) {
move_player(right);
}
draw_hud();
draw_player();
draw_bases();
draw_invaders();
draw_saucer();
draw_serviceProjectMatch(match);
draw_bullets(bullets, P_BULLETS);
draw_bullets(enemy_bullets, E_BULLETS);
enemy_hit_collision();
player_hit_collision();
enemy_base_collision();
saucer_hit_collision();
bullet_base_collision(enemy_bullets, E_BULLETS, 1);
bullet_base_collision(bullets, P_BULLETS, 0);
enemy_player_collision();
move_invaders(invaders.speed);
move_saucer();
movenemy_bullets(bullets, P_BULLETS, -30);
movenemy_bullets(enemy_bullets, E_BULLETS, 15);
calculate_level();
enemy_ai();
game_over_ai();
pause_game();
} else if (state == game_over) {
draw_hud();
draw_player();
draw_bases();
draw_invaders();
draw_saucer();
draw_bullets(bullets, P_BULLETS);
draw_bullets(enemy_bullets, E_BULLETS);
draw_game_over();
} else if (state == pause) {
draw_hud();
draw_player();
draw_bases();
draw_invaders();
draw_saucer();
draw_bullets(bullets, P_BULLETS);
draw_bullets(enemy_bullets, E_BULLETS);
pause_game();
}
/* Ask SDL to update the entire screen. */
SDL_Flip(screen);
next_game_tick += 1000 / 30;
sleep = next_game_tick - SDL_GetTicks();
if( sleep >= 0 ) {
SDL_Delay(sleep);
}
}
return 0;
}
void space(void) {
byte c;
byte move_left, move_right;
char delay_count;
byte do_exit;
move_left = 0;
move_right = 0;
shot_y = 0;
shot_x = 0;
inv_shot_y = 0;
inv_shot_x = 0;
do_exit = 0;
clrbuf();
init_game();
delay_count = 0;
do {
clrbuf();
draw_invaders();
draw_tank(tank_pos);
// tank shot
tank_shot();
// invader shot
invaders_shot();
buf2screen();
// delay invader movement
if (++delay_count >= 5 - ((char)inv_pos_y / 3)) {
delay_count = 0;
move_invaders();
}
// delay
if (inv_count < 14)
delay_ms((14 - inv_count));
// read keyboard
c = io_read(129);
if (c == 0xe0) {
c = io_read(129);
if (c == 0x6b) { // left down
move_left = 1;
} else if (c == 0x74) { // right down
move_right = 1;
} else if (c == 0x6b + 0x80) { // left up
move_left = 0;
} else if (c == 0x74 + 0x80) { // right up
move_right = 0;
}
} else if (c == 0x29) { // shoot
if (shot_y == 0) {
shot_x = (tank_pos + 1) * 2 + 1;
shot_y = 90;
}
}
else if (c == 0x76) { // escape
do_exit = 1;
}
// move tank
if (move_left) {
if (tank_pos > 0)
tank_pos -= 1;
} else if (move_right) {
if (tank_pos < 76)
tank_pos += 1;
}
} while (!do_exit);
}
