int init_subsystems(void) {
init_hud();
init_flares();
init_starfield();
init_fire();
init_particles();
init_chunks();
init_video_new_game();
reset_update();
reset_plugins();
init_asteroids();
return (0);
}
int main (int argc, char* args[]) {
//SDL Window setup
if (init(SCREEN_WIDTH, SCREEN_HEIGHT) == 1) {
return 0;
}
int i = 0;
int j = 0;
int offset = 0;
struct vector2d translation = {-SCREEN_WIDTH / 2, -SCREEN_HEIGHT / 2};
//set up icons used to represent player lives
for (i = 0; i < LIVES; i++) {
init_player(&lives[i]);
lives[i].lives = 1;
//shrink lives
for (j = 0; j < P_VERTS; j++) {
divide_vector(&lives[i].obj_vert[j], 2);
}
//convert screen space vector into world space
struct vector2d top_left = {20 + offset, 20};
add_vector(&top_left, &translation);
lives[i].location = top_left;
update_player(&lives[i]);
offset += 20;
}
//set up player and asteroids in world space
init_player(&p);
init_asteroids(asteroids, ASTEROIDS);
int sleep = 0;
int quit = 0;
SDL_Event event;
Uint32 next_game_tick = SDL_GetTicks();
//render loop
while(quit == 0) {
//check for new events every frame
SDL_PumpEvents();
const Uint8 *state = SDL_GetKeyboardState(NULL);
if (state[SDL_SCANCODE_ESCAPE]) {
quit = 1;
}
if (state[SDL_SCANCODE_UP]) {
struct vector2d thrust = get_direction(&p);
multiply_vector(&thrust, .06);
apply_force(&p.velocity, thrust);
}
if (state[SDL_SCANCODE_LEFT]) {
rotate_player(&p, -4);
}
if (state[SDL_SCANCODE_RIGHT]) {
rotate_player(&p, 4);
}
while (SDL_PollEvent(&event)) {
switch(event.type) {
case SDL_KEYDOWN:
switch( event.key.keysym.sym ) {
case SDLK_SPACE:
if (p.lives > 0) {
shoot_bullet(&p);
}
break;
}
}
}
//draw to the pixel buffer
clear_pixels(pixels, 0x00000000);
draw_player(pixels, &p);
draw_player(pixels, &lives[0]);
draw_player(pixels, &lives[1]);
draw_player(pixels, &lives[2]);
draw_asteroids(pixels, asteroids, ASTEROIDS);
update_player(&p);
bounds_player(&p);
bounds_asteroids(asteroids, ASTEROIDS);
int res = collision_asteroids(asteroids, ASTEROIDS, &p.location, p.hit_radius);
if (res != -1) {
p.lives--;
p.location.x = 0;
p.location.y = 0;
p.velocity.x = 0;
p.velocity.y = 0;
int i = LIVES - 1;
for ( i = LIVES; i >= 0; i--) {
if(lives[i].lives > 0) {
lives[i].lives = 0;
break;
}
}
}
int i = 0;
struct vector2d translation = {-SCREEN_WIDTH / 2, -SCREEN_HEIGHT / 2};
for (i = 0; i < BULLETS; i++) {
//only check for collision for bullets that are shown on screen
if (p.bullets[i].alive == TRUE) {
//convert bullet screen space location to world space to compare
//with asteroids world space to detect a collision
struct vector2d world = add_vector_new(&p.bullets[i].location, &translation);
int index = collision_asteroids(asteroids, ASTEROIDS, &world, 1);
//collision occured
if (index != -1) {
asteroids[index].alive = 0;
p.bullets[i].alive = FALSE;
if (asteroids[index].size != SMALL) {
spawn_asteroids(asteroids, ASTEROIDS, asteroids[index].size, asteroids[index].location);
}
}
}
}
update_asteroids(asteroids, ASTEROIDS);
//draw buffer to the texture representing the screen
SDL_UpdateTexture(screen, NULL, pixels, SCREEN_WIDTH * sizeof (Uint32));
//draw to the screen
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, screen, NULL, NULL);
SDL_RenderPresent(renderer);
//time it takes to render 1 frame in milliseconds
next_game_tick += 1000 / 60;
sleep = next_game_tick - SDL_GetTicks();
if( sleep >= 0 ) {
SDL_Delay(sleep);
}
}
//free the screen buffer
free(pixels);
//Destroy window
SDL_DestroyWindow(window);
//Quit SDL subsystems
SDL_Quit();
return 0;
}
