void particle_loop(int fd, int num_particles) {
struct particle *particles;
int i;
particles = malloc(sizeof(struct particle) * num_particles);
for (i=0; i<num_particles; i++)
particle_init(&particles[i]);
while (1) {
float dt = get_time_step();
for (i=0; i<num_particles; i++)
particle_update(&particles[i], dt);
rwand_update(fd, particles, num_particles, 40);
}
free(particles);
}
static int
lupdate(lua_State *L) {
luaL_checktype(L,1,LUA_TUSERDATA);
struct particle_system *ps = (struct particle_system *)lua_touserdata(L, 1);
float dt = luaL_checknumber(L,2);
struct matrix *anchor = (struct matrix*)lua_touserdata(L, 3);
int edge = (int)luaL_checkinteger(L, 4);
/* if (ps->config->positionType == POSITION_TYPE_GROUPED) {
struct matrix *m = (struct matrix *)lua_touserdata(L, 3);
ps->config->sourcePosition.x = m->m[4] / SCREEN_SCALE;
ps->config->sourcePosition.y = m->m[5] / SCREEN_SCALE;
} else {
ps->config->sourcePosition.x = 0;
ps->config->sourcePosition.y = 0;
}*/
bool ok = particle_update(ps, dt, anchor);
lua_pushboolean(L, ok);
return 1;
}
void update(void)
{
static int time = 0;
if(SDL_GetTicks() - time > 16){
flicker = !flicker;
time = SDL_GetTicks();
float pos[2] = {0.0f, 1.0f};
float vel[2] = {0.0f, 0.0f};
float ang = angle + (1.0f - 2.0f*(float)rand() / (float) RAND_MAX) * log(scale[player->state]) * - 5;
float rad = 175.0f + 250 * exp(scale[player->state] / scale[elephant]);
pos[0] = cos(3.0f*PI/2.0f-ang) * rad;
pos[1] = sin(3.0f*PI/2.0f-ang) * rad;
particle_add(pos, vel);
}
if(!title){
actor_update(player);
particle_update();
}
}
// the main game loop which will run until the game is done
void game_loop() {
SDL_Event event, e;
SDL_TimerID timer;
int last_game_update = 0;
int last_particle_update = 0;
int last_render = 0;
int previous_level = 0;
debug_print("Loading media...");
load_media();
// check if we want to show score increments
game.show_score_increments = atoi(config_getValue("show_score_increments"));
// setup input
input_init();
// create & show menu
ui_menuInit();
ui_toggleMenuVisible();
SDL_SetEventFilter(ui_handleEvents);
// loop forever
debug_print("Entering main game loop...");
while (1) {
// see if its time to trigger an update (make sure we're not paused either)
if (!game.paused &&
SDL_GetTicks() - last_game_update > game_getGameUpdateFreq()) {
last_game_update = SDL_GetTicks(); // remember time of last update
game_update();
}
if (game.show_score_increments) { // at the moment we just have the one particle set
// see if its time to trigger a particle update
if (SDL_GetTicks() - last_particle_update > PARTICLE_UPDATE_INTERVAL) {
last_particle_update = SDL_GetTicks();
particle_update();
}
}
// check for any events waiting
while (SDL_PollEvent(&event)) {
switch(event.type) {
// key presses are handled in input.c
case SDL_KEYDOWN:
input_onKeyDown(event.key.keysym.sym);
break;
case LEFT_KEY:
tetromino_moveLeft(current_tetromino);
if (grid_checkCollision(grid, current_tetromino)) {
tetromino_moveRight(current_tetromino);
}
break;
case RIGHT_KEY:
tetromino_moveRight(current_tetromino);
if (grid_checkCollision(grid, current_tetromino)) {
tetromino_moveLeft(current_tetromino);
}
break;
case DOWN_KEY:
// uses the key repeat interval to accelerate the tetromino down
tetromino_moveDown(current_tetromino);
if (grid_checkCollision(grid, current_tetromino)) {
tetromino_moveUp(current_tetromino);
}
break;
case UP_KEY:
// rotate to a new position
tetromino_setNextPosition(current_tetromino);
tetromino_setShape(current_tetromino, current_tetromino->type,
current_tetromino->position);
// make sure the new position doesn't cause any collisions
// if it does, reverse the rotation
if (grid_checkCollision(grid, current_tetromino)) {
tetromino_setPrevPosition(current_tetromino);
tetromino_setShape(current_tetromino, current_tetromino->type,
current_tetromino->position);
}
break;
case SPACE_KEY:
tetromino_moveDown(current_tetromino);
// move the tetromino down until it causes a collision
while (!grid_checkCollision(grid, current_tetromino)) {
tetromino_moveDown(current_tetromino);
}
// once we have a collision, move it back into place
tetromino_moveUp(current_tetromino);
break;
case PAUSE_KEY:
debug_print("Pausing game");
game.paused = !game.paused;
// stop the game timer
if (game.paused) {
SDL_RemoveTimer(timer);
timer = NULL;
}
else { // start it again
timer = SDL_AddTimer(1000, game_updateTime, NULL);
}
break;
case ESCAPE_KEY:
// pause game updates
debug_print("Escape key pressed.");
// toggle paused game state if we're in game
if (grid && current_tetromino) {
game.paused = !game.paused;
if (game.paused) { // stop couting time played
SDL_RemoveTimer(timer);
timer = NULL;
}
// starting timer again, only if we're still in a game
else if (grid && current_tetromino) {
timer = SDL_AddTimer(1000, game_updateTime, NULL);
}
}
// show or hide the menu
if (grid && current_tetromino) {
ui_toggleMenuVisible();
}
// enable ui message pump if its visible
if (ui_isMenuVisible()) {
// if we're in game, show in-game menu
if (grid && current_tetromino) {
ui_menuPageSetCurrentById(MENU_IN_GAME);
}
// otherwise show main menu
else {
ui_menuPageSetCurrentById(MENU_MAIN);
}
SDL_SetEventFilter(ui_handleEvents);
}
break;
case GAME_START_NEW:
// set some game variables
game.level = 0;
game.score = 0;
game.lines = 0;
game.paused = 0;
// time variables
game.hours = 0;
game.minutes = 0;
game.seconds = 0;
// create the grid
grid = grid_createNew(GRID_WIDTH, GRID_HEIGHT);
// create the first tetromino
current_tetromino = tetromino_createNew();
current_tetromino->x = 0;
current_tetromino->y = 0;
// update time
SDL_Init(SDL_INIT_TIMER);
if (timer) {
SDL_RemoveTimer(timer);
timer = NULL;
}
ui_toggleMenuVisible();
timer = SDL_AddTimer(1000, game_updateTime, NULL);
game.paused = 0;
break;
case GAME_END: // called by either the menu or game over scenario
// destroy timer, grid and tetromino
SDL_RemoveTimer(timer);
timer = NULL;
grid_destroy(grid);
grid = NULL;
tetromino_destroy(current_tetromino);
current_tetromino = NULL;
// show menu if it isn't already visible
ui_menuPageSetCurrentById(MENU_MAIN);
if (!ui_isMenuVisible()) {
SDL_SetEventFilter(ui_handleEvents);
ui_toggleMenuVisible();
}
break;
case TETROMINO_CREATE:
// assumes that the old one has already been discarded
current_tetromino = tetromino_createNew();
current_tetromino->x = 0;
current_tetromino->y = 0;
// check if we have an immediate collision (game over)
if (grid_checkCollision(grid, current_tetromino)) {
SDL_RemoveTimer(timer);
timer = NULL;
e.type = GAME_END;
SDL_PushEvent(&e);
}
break;
case GRID_REMOVE_LINE:
if (game.show_score_increments) {
// animated score increment
game_showScoreIncrement(event.user.code, (game.level + 1) * 10);
}
grid_removeLine(grid, event.user.code);
// increment number of complete lines
game.lines += 1;
// +10 per block and x10 per level
game.score += (game.level + 1) * 10 * GRID_WIDTH;
// increment the game level every 10 lines
previous_level = game.level;
game.level = game.lines / 10;
if (previous_level != game.level) {
game_showLevelIncrement();
}
break;
case GAME_QUIT:
SDL_RemoveTimer(timer); // stop gameplay timer
timer = NULL;
game_shutdown();
break;
// unhandled events are ignored
default:
break;
}
}
// update the display
// without this delay gfx card tries to commit suicide by melting
if (SDL_GetTicks() - last_render > 3) {
display_update();
last_render= SDL_GetTicks();
}
}
}
