main.c

   1 /* Variations on RockDodger
   2  * Space Rocks copyright (C) 2001 Paul Holt <pad@pcholt.com>
   3  *
   4  * Project fork 2004, Jason Woofenden and Joshua Grams.
   5  * (a whole bunch of modifications and project rename)
   6
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <math.h>
  23 #include <SDL.h>
  24 #include <SDL_image.h>
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <time.h>
  30
  31 #include "font.h"
  32
  33 #include "args.h"
  34 #include "common.h"
  35 #include "vorconfig.h"
  36 #include "dust.h"
  37 #include "file.h"
  38 #include "float.h"
  39 #include "globals.h"
  40 #include "mt.h"
  41 #include "rocks.h"
  42 #include "score.h"
  43 #include "sprite.h"
  44 #include "sound.h"
  45 #include "autopilot.h"
  46
  47 // ************************************* VARS
  48 // SDL_Surface global variables
  49 SDL_Surface
  50         *surf_screen,   // Screen
  51         *surf_b_variations, // "variations" banner
  52         *surf_b_on, // "on" banner
  53         *surf_b_rockdodger, // "rockdodger" banner
  54         *surf_b_game,   // Title element "game"
  55         *surf_b_over,   // Title element "over"
  56         *surf_life,     // Indicator of number of ships remaining
  57         *surf_rock[NROCKS],     // THE ROCKS
  58         *surf_font_big; // The big font
  59
  60
  61 font *g_font;
  62
  63 struct dot {
  64         int active;
  65         float x, y;
  66         float dx, dy;
  67         float mass;   // in DOT_MASS_UNITs
  68         float decay;  // rate at which to reduce mass.
  69         int heat;     // heat multiplier (color).
  70 };
  71
  72 void draw(void);
  73
  74 struct dot edot[MAXENGINEDOTS], *dotptr = edot;
  75 struct dot bdot[MAXBANGDOTS];
  76
  77 // Other global variables
  78 char topline[1024];
  79 char *initerror = "";
  80 int screenshot_number = 0;
  81
  82 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  83
  84 float screendx = BARRIER_SPEED, screendy = 0.0;
  85 float dist_ahead;
  86
  87 // all movement is based on t_frame.
  88 unsigned long frames, start, end;
  89 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  90 int ms_frame;   // length of this frame (milliseconds)
  91 int ms_end;     // end of this frame (milliseconds)
  92
  93 float gamespeed = 1.00;
  94
  95 int score;
  96
  97 float fadetimer = 0;
  98
  99 int paused = 0;
 100
 101 // bangdot start (bd1) and end (bd2) position:
 102 int bd1 = 0, bd2 = 0;
 103
 104 enum states {
 105         TITLE_PAGE,
 106         GAMEPLAY,
 107         DEAD_PAUSE,
 108         GAME_OVER,
 109         HIGH_SCORE_ENTRY,
 110         HIGH_SCORE_DISPLAY
 111 };
 112 enum states state = TITLE_PAGE;
 113 float state_timeout = 600.0;
 114
 115 #define NSEQUENCE 3
 116 char *msgs[2][3] = {
 117         {
 118                 "Press SPACE for normal game",
 119                 "Press '1' for easy game",
 120                 "http://jasonwoof.org/vor"
 121         },
 122         {
 123                 "Press SPACE for easy game",
 124                 "Press '2' for normal game",
 125                 "http://jasonwoof.org/vor"
 126         }
 127 };
 128
 129 int bangdotlife, nbangdots;
 130 Uint16 heatcolor[W*3];
 131
 132 char *data_dir;
 133 extern char *optarg;
 134 extern int optind, opterr, optopt;
 135
 136 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 137
 138 // ************************************* FUNCS
 139
 140 void
 141 tiny_sleep() {
 142         struct timespec t;
 143         t.tv_sec = 0;
 144         t.tv_nsec = 1;
 145         nanosleep(&t, 0);
 146 }
 147
 148 void
 149 init_engine_dots() {
 150         int i;
 151         for(i = 0; i<MAXENGINEDOTS; i++) {
 152                 edot[i].active = 0;
 153         }
 154 }
 155
 156
 157 void
 158 new_engine_dots(void) {
 159         int dir, i;
 160         int n = t_frame * ENGINE_DOTS_PER_TIC;
 161         float a, r;  // angle, random length
 162         float dx, dy;
 163         float hx, hy; // half ship width/height.
 164         static const int s[4] = { 2, 1, 0, 1 };
 165         float time;
 166         float accelh, accelv, past_ship_dx, past_ship_dy;
 167
 168         hx = ship.image->w / 2;
 169         hy = ship.image->h / 2;
 170
 171         for(dir=0; dir<4; dir++) {
 172                 if(!(ship.jets & 1<<dir)) continue;
 173
 174                 for(i = 0; i<n; i++) {
 175                         if(dotptr->active == 0) {
 176                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 177                                 r = sin(frnd()*M_PI);
 178                                 dx = r * cos(a);
 179                                 dy = r * -sin(a);  // screen y is "backwards".
 180
 181                                 dotptr->decay = 3;
 182                                 dotptr->heat = 6;
 183
 184                                 // dot was created at a random time during the time span
 185                                 time = frnd() * t_frame; // this is how long ago
 186
 187                                 // calculate how fast the ship was going when this engine dot was
 188                                 // created (as if it had a smooth acceleration). This is used in
 189                                 // determining the velocity of the dots, but not their starting
 190                                 // location.
 191                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 192                                 accelh *= THRUSTER_STRENGTH * time;
 193                                 past_ship_dx = ship.dx - accelh;
 194                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 195                                 accelv *= THRUSTER_STRENGTH * time;
 196                                 past_ship_dy = ship.dy - accelv;
 197
 198                                 // the starting position (not speed) of the dot is calculated as
 199                                 // though the ship were traveling at a constant speed for this
 200                                 // t_frame.
 201                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 202                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 203                                 if(dir&1) {
 204                                         dotptr->dx = past_ship_dx + 2*dx;
 205                                         dotptr->dy = past_ship_dy + 20*dy;
 206                                         dotptr->mass = 60 * fabs(dy);
 207                                 } else {
 208                                         dotptr->dx = past_ship_dx + 20*dx;
 209                                         dotptr->dy = past_ship_dy + 2*dy;
 210                                         dotptr->mass = 60 * fabs(dx);
 211                                 }
 212
 213                                 // move the dot as though it were created in the past
 214                                 dotptr->x += (dotptr->dx - screendx) * time;
 215                                 dotptr->y += (dotptr->dy - screendy) * time;
 216
 217                                 if(!fclip(dotptr->x, XSIZE) && !fclip(dotptr->y, YSIZE)) {
 218                                         dotptr->active = 1;
 219                                         if(dotptr - edot < MAXENGINEDOTS-1) {
 220                                                 dotptr++;
 221                                         } else {
 222                                                 dotptr = edot;
 223                                         }
 224                                 }
 225                         }
 226                 }
 227         }
 228 }
 229
 230
 231 void
 232 new_bang_dots(struct sprite *s)
 233 {
 234         int i, n, x, y;
 235         uint16_t *pixel, c;
 236         uint32_t colorkey;
 237         int row_inc;
 238         double theta, r;
 239         SDL_Surface *img = s->image;
 240
 241         n = 20;
 242         pixel = img->pixels;
 243         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 244         colorkey = img->format->colorkey;
 245
 246         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 247
 248         for(i=0; i<n; i++) {
 249                 pixel = img->pixels;
 250                 for(y=0; y<img->h; y++) {
 251                         for(x = 0; x<img->w; x++) {
 252                                 c = *pixel++;
 253                                 if(c && c != colorkey) {
 254                                         theta = frnd()*M_PI*2;
 255                                         r = frnd(); r = 1 - r*r;
 256
 257                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 258                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 259                                         bdot[bd2].x = x + s->x;
 260                                         bdot[bd2].y = y + s->y;
 261                                         bdot[bd2].mass = frnd() * 99;
 262                                         bdot[bd2].decay = frnd()*1.5 + 0.5;
 263                                         bdot[bd2].heat = 3;
 264                                         bdot[bd2].active = 1;
 265
 266                                         bd2 = (bd2+1) % MAXBANGDOTS;
 267                                 }
 268                                 pixel += row_inc;
 269                         }
 270                 }
 271         }
 272
 273         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 274 }
 275
 276
 277 void
 278 move_dot(struct dot *d)
 279 {
 280         Sprite *hit;
 281         float mass;
 282
 283         if(d->active) {
 284                 d->x += (d->dx - screendx) * t_frame;
 285                 d->y += (d->dy - screendy) * t_frame;
 286                 d->mass -= t_frame * d->decay;
 287                 if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
 288                         d->active = 0;
 289                 else {
 290                         hit = pixel_collides(d->x, d->y);
 291                         if(hit) if(hit->type != SHIP) {
 292                                 d->active = 0;
 293                                 mass = sprite_mass(hit);
 294                                 hit->dx += DOT_MASS_UNIT * d->mass * (d->dx - hit->dx) / mass;
 295                                 hit->dy += DOT_MASS_UNIT * d->mass * (d->dy - hit->dy) / mass;
 296                         }
 297                 }
 298         }
 299 }
 300
 301 void
 302 move_dots(void)
 303 {
 304         int i;
 305
 306         for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i]);
 307         for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i]);
 308 }
 309
 310
 311 void
 312 draw_dot(struct dot *d)
 313 {
 314         uint16_t *pixels, *pixel;
 315         int row_inc;
 316
 317         if(d->active) {
 318                 pixels = (uint16_t *) surf_screen->pixels;
 319                 row_inc = surf_screen->pitch / sizeof(uint16_t);
 320                 pixel = pixels + (int)d->y * row_inc + (int)d->x;
 321                 *pixel = heatcolor[min(3*W-1, (int)(d->mass * d->heat))];
 322         }
 323 }
 324
 325 void
 326 draw_dots(void) {
 327         int i;
 328
 329         if(SDL_MUSTLOCK(surf_screen)) { SDL_LockSurface(surf_screen); }
 330         draw_dust();
 331         for(i=0; i<MAXBANGDOTS; i++) draw_dot(&bdot[i]);
 332         for(i=0; i<MAXENGINEDOTS; i++) draw_dot(&edot[i]);
 333         if(SDL_MUSTLOCK(surf_screen)) { SDL_UnlockSurface(surf_screen); }
 334 }
 335
 336 SDL_Surface *
 337 load_image(char *filename)
 338 {
 339         SDL_Surface *tmp, *img = NULL;
 340         char *s = add_data_path(filename);
 341         if(s) {
 342                 tmp = IMG_Load(s);
 343                 free(s);
 344                 if(tmp) {
 345                         img = SDL_DisplayFormat(tmp);
 346                         SDL_FreeSurface(tmp);
 347                 }
 348         }
 349         return img;
 350 }
 351
 352 void
 353 load_ship(void)
 354 {
 355         load_sprite(SPRITE(&ship), "ship.png");
 356 }
 357
 358 void font_cleanup() {
 359         font_free(g_font);
 360 }
 361
 362 void
 363 set_video_mode() {
 364         Uint32 flag;
 365
 366         // Attempt to get the required video size
 367         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 368         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 369         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 370 }
 371
 372 void
 373 toggle_fullscreen() {
 374         opt_fullscreen = 1 - opt_fullscreen;
 375         set_video_mode();
 376         if(paused) {
 377                 draw();
 378         }
 379 }
 380
 381
 382 int
 383 init(void) {
 384
 385         int i;
 386         char *s;
 387
 388         // Where are our data files?
 389         if(!find_files()) exit(1);
 390         read_high_score_table();
 391
 392         if(opt_sound) {
 393                 // Initialize SDL with audio and video
 394                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 395                         opt_sound = 0;
 396                         fputs("Can't open sound, starting without it\n", stderr);
 397                         atexit(SDL_Quit);
 398                 } else {
 399                         atexit(SDL_Quit);
 400                         atexit(SDL_CloseAudio);
 401                         opt_sound = init_sound();
 402                 }
 403         } else {
 404                 // Initialize with video only
 405                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 406                 atexit(SDL_Quit);
 407         }
 408
 409         play_tune(TUNE_TITLE_PAGE);
 410
 411
 412         // Attempt to get the required video size
 413         set_video_mode();
 414
 415         // Set the title bar text
 416         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 417
 418         NULLERROR(surf_screen);
 419
 420         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 421         for(i = 0; i<W*3; i++) {
 422                 heatcolor[i] = SDL_MapRGB(
 423                         surf_screen->format,
 424                         (i<W)?(i*M/W):(M),(i<W)?0:(i<2*W)?((i-W)*M/W):M,(i<2*W)?0:((i-W)*M/W) // Got that?
 425                 );
 426         }
 427
 428         // Load the banners
 429         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 430         NULLERROR(surf_b_on = load_image("b_on.png"));
 431         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 432
 433         NULLERROR(surf_b_game = load_image("b_game.png"));
 434         NULLERROR(surf_b_over = load_image("b_over.png"));
 435
 436         // Load the life indicator (small ship) graphic.
 437         NULLERROR(surf_life = load_image("life.png"));
 438
 439         // Load the font image
 440         s = add_data_path("font.png");
 441         if(s) {
 442                 g_font = font_load(s);
 443                 atexit(&font_cleanup);
 444         } else {
 445                 fprintf(stderr, "could create path to font\n");
 446                 exit(1);
 447         }
 448
 449         init_engine_dots();
 450         init_dust();
 451
 452         init_sprites();
 453         add_sprite(SPRITE(&ship));
 454
 455         // Remove the mouse cursor
 456 #ifdef SDL_DISABLE
 457         SDL_ShowCursor(SDL_DISABLE);
 458 #endif
 459
 460         return 0;
 461 }
 462
 463 void
 464 show_lives(void)
 465 {
 466         int i;
 467         SDL_Rect dest;
 468
 469         for(i=0; i<ship.lives-1; i++) {
 470                 dest.x = (i + 1)*(surf_life->w + 10);
 471                 dest.y = 20;
 472                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 473         }
 474 }
 475
 476 void
 477 draw_game_over(void)
 478 {
 479         int x;
 480         char *text0, *text1;
 481         SDL_Rect dest;
 482
 483         fadetimer += t_frame;
 484
 485         dest.x = (XSIZE-surf_b_game->w)/2;
 486         dest.y = (YSIZE-surf_b_game->h)/2-40;
 487         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 488
 489         dest.x = (XSIZE-surf_b_over->w)/2;
 490         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 491         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 492
 493         if(new_high_score(score)) {
 494                 text0 = "New High Score!";
 495                 text1 = "Press SPACE to continue";
 496         } else {
 497                 text0 = msgs[g_easy][0];
 498                 text1 = msgs[g_easy][1];
 499         }
 500
 501         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 502         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 503
 504         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 505         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 506 }
 507
 508 void
 509 draw_title_page(void)
 510 {
 511         int x;
 512         char *text;
 513         SDL_Rect dest;
 514
 515         fadetimer += t_frame/2.0;
 516
 517         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 518         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 519         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 520
 521         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 522         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 523         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 524
 525         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 526         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 527         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 528
 529         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 530         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 531         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 532
 533         text = "Version " VERSION;
 534         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 535         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 536 }
 537
 538 void
 539 draw(void)
 540 {
 541         SDL_FillRect(surf_screen,NULL,0);  // black background
 542         draw_dots();            // background dots
 543         draw_sprite(SPRITE(&ship));
 544         draw_rocks();
 545
 546         show_lives();
 547         show_score();
 548
 549         switch (state) {
 550                 case GAME_OVER:
 551                         draw_game_over();
 552                         break;
 553
 554                 case TITLE_PAGE:
 555                         draw_title_page();
 556                         break;
 557
 558                 case HIGH_SCORE_ENTRY:
 559                 case HIGH_SCORE_DISPLAY:
 560                         display_scores(150,50);
 561                         break;
 562
 563                 case GAMEPLAY:
 564                 case DEAD_PAUSE:
 565                         ; // no action necessary
 566         }
 567
 568         // Update the surface
 569         SDL_Flip(surf_screen);
 570 }
 571
 572 static inline void
 573 kill_ship(struct ship *ship)
 574 {
 575         play_sound(SOUND_BANG);
 576         new_bang_dots(SPRITE(ship));
 577         if(--ship->lives) {
 578                 state = DEAD_PAUSE;
 579                 state_timeout = DEAD_PAUSE_LENGTH;
 580                 // want ship to be invisible, but keep drifting at sqrt(speed)
 581                 // to leave it in the middle of the space from the explosion.
 582                 ship->flags = MOVE;
 583                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 584                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 585                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 586         } else {
 587                 state = GAME_OVER;
 588                 play_tune(TUNE_TITLE_PAGE);
 589                 state_timeout = 200.0;
 590                 fadetimer = 0.0;
 591                 ship->flags = 0;
 592                 // scrolling is based on the ship speed, so we need to reset it.
 593                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 594         }
 595 }
 596
 597 void
 598 do_collision(Sprite *a, Sprite *b)
 599 {
 600         if(a->type == SHIP) kill_ship((struct ship *)a);
 601         else if(b->type == SHIP) kill_ship((struct ship *)b);
 602         else bounce(a, b);
 603 }
 604
 605 void
 606 init_score_entry(void)
 607 {
 608         SDL_Event e;
 609         state = HIGH_SCORE_ENTRY;
 610         state_timeout = 5.0e6;
 611         SDL_EnableUNICODE(1);
 612         while(SDL_PollEvent(&e))
 613                 ;
 614         insert_score(score);
 615 }
 616
 617 // Count down the state timer, and change state when it gets to zero or less;
 618 void
 619 update_state(void)
 620 {
 621         state_timeout -= t_frame*3;
 622         if(state_timeout > 0) return;
 623
 624         switch(state) {
 625                 case GAMEPLAY: break;  // no action necessary
 626                 case DEAD_PAUSE:
 627                         // Restore the ship and continue playing
 628                         ship.flags = DRAW|MOVE|COLLIDE;
 629                         state = GAMEPLAY;
 630                         break;
 631                 case GAME_OVER:
 632                         if(new_high_score(score)) init_score_entry();
 633                         else {
 634                                 state = HIGH_SCORE_DISPLAY;
 635                                 state_timeout = 400;
 636                         }
 637                         break;
 638                 case HIGH_SCORE_DISPLAY:
 639                         state = TITLE_PAGE;
 640                         state_timeout = 600.0;
 641                         fadetimer = 0.0;
 642                         break;
 643                 case HIGH_SCORE_ENTRY:
 644                         break;
 645                 case TITLE_PAGE:
 646                         state = HIGH_SCORE_DISPLAY;
 647                         state_timeout = 200.0;
 648                         break;
 649         }
 650 }
 651
 652 void
 653 gameloop() {
 654         SDL_Event e;
 655         Uint8 *keystate;
 656         float tmp;
 657
 658         for(;;) {
 659                 ms_frame = SDL_GetTicks() - ms_end;
 660                 ms_end += ms_frame;
 661                 if(ms_frame > 50) {
 662                         ms_frame = 50;
 663                 }
 664                 t_frame = gamespeed * ms_frame / 50;
 665                 frames++;
 666
 667                 if(opt_autopilot) {
 668                         autopilot(t_frame);
 669                 }
 670
 671                 while(paused ? SDL_WaitEvent(&e) : SDL_PollEvent(&e)) {
 672                         switch(e.type) {
 673                                 case SDL_QUIT: return;
 674                                 case SDL_KEYDOWN:
 675                                         // even during high-score entry
 676                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 677                                                 return;
 678                                         }
 679
 680                                         if(state == HIGH_SCORE_ENTRY) {
 681                                                 if(!process_score_input(&e.key.keysym)) {
 682                                                         // Write the high score table to the file
 683                                                         write_high_score_table();
 684                                                         // continue to display the scores briefly
 685                                                         state = HIGH_SCORE_DISPLAY;
 686                                                         state_timeout = 200;
 687                                                 }
 688                                         } else {
 689                                                 switch(e.key.keysym.sym) {
 690                                                         case SDLK_q:
 691                                                                 return;
 692                                                         case SDLK_3:
 693                                                         case SDLK_PRINT:
 694                                                                 {
 695                                                                         FILE *screenshot_fp;
 696                                                                         char tmp[30];
 697                                                                         char *screenshot_filename = &(tmp[0]);
 698                                                                         for(;;) {
 699                                                                                 snprintf(screenshot_filename, 30, "vor-screenshot-%02i.bmp", screenshot_number++);
 700                                                                                 screenshot_fp = fopen(screenshot_filename, "r");
 701                                                                                 if(screenshot_fp) {
 702                                                                                         fclose(screenshot_fp);
 703                                                                                 } else {
 704                                                                                         break;
 705                                                                                 }
 706                                                                         }
 707                                                                         SDL_SaveBMP(surf_screen, screenshot_filename);
 708                                                                 }
 709                                                                 break;
 710                                                         case SDLK_p:
 711                                                         case SDLK_PAUSE:
 712                                                                 paused = !paused;
 713                                                                 if(paused) {
 714                                                                         pause_tune();
 715                                                                 } else {
 716                                                                         resume_tune();
 717                                                                         ms_end = SDL_GetTicks();
 718                                                                 }
 719                                                                 break;
 720                                                         case SDLK_f:
 721                                                         case SDLK_F11:
 722                                                                 toggle_fullscreen();
 723                                                                 break;
 724                                                         default:
 725                                                                 // other keys are handled by checking keystate each frame
 726                                                                 break;
 727                                                 }
 728                                         }
 729                                         break;
 730                         }
 731                 }
 732                 keystate = SDL_GetKeyState(NULL);
 733                 if(opt_autopilot) {
 734                         autopilot_fix_keystates(keystate);
 735                 }
 736
 737                 if(state == GAMEPLAY) {
 738                         if(!paused) {
 739                                 score += ms_frame;
 740
 741                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_KP4]) {
 742                                         ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;
 743                                 }
 744                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_KP5] || keystate[SDLK_KP2]) {
 745                                         ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;
 746                                 }
 747                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_KP6]) {
 748                                         ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;
 749                                 }
 750                                 if(keystate[SDLK_UP]    || keystate[SDLK_KP8]) {
 751                                         ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;
 752                                 }
 753                                 if(ship.jets) {
 754                                         ship.dx = fconstrain2(ship.dx, -50, 50);
 755                                         ship.dy = fconstrain2(ship.dy, -50, 50);
 756                                 }
 757                         }
 758
 759                 }
 760
 761                 if(!paused) {
 762                         update_state();
 763
 764                         // SCROLLING
 765                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 766                         screendy += tmp * t_frame/12;
 767                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 768                         screendx += tmp * t_frame/12;
 769                         // taper off so we don't hit the barrier abruptly.
 770                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 771                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 772                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 773                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 774                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 775
 776                         move_sprites();
 777                         move_dots();
 778                         move_dust();
 779
 780                         new_rocks();
 781
 782                         // BOUNCE off left or right edge of screen
 783                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 784                                 ship.x -= (ship.dx-screendx)*t_frame;
 785                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 786                                 ship.x = fconstrain(ship.x, XSIZE - ship.w);
 787                         }
 788
 789                         // BOUNCE off top or bottom of screen
 790                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 791                                 ship.y -= (ship.dy-screendy)*t_frame;
 792                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 793                                 ship.y = fconstrain(ship.y, YSIZE - ship.h);
 794                         }
 795
 796                         new_engine_dots();
 797
 798                         collisions(); // must happen after ship bouncing because it puts pixels where the ship is (thus the ship must be on the screen)
 799
 800
 801                         draw();
 802
 803                         // new game
 804                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 805                            && (state == HIGH_SCORE_DISPLAY
 806                                || state == TITLE_PAGE
 807                                || state == GAME_OVER)) {
 808                                 if(state == GAME_OVER && new_high_score(score))
 809                                         init_score_entry();
 810                                 else {
 811                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 812                                                 g_easy = 0;
 813                                                 initial_rocks = NORMAL_I_ROCKS;
 814                                                 final_rocks = NORMAL_F_ROCKS;
 815                                                 if(gamespeed == EASY_GAMESPEED)
 816                                                         gamespeed = NORMAL_GAMESPEED;
 817                                         } else if(keystate[SDLK_1]) {
 818                                                 g_easy = 1;
 819                                                 initial_rocks = EASY_I_ROCKS;
 820                                                 final_rocks = EASY_F_ROCKS;
 821                                                 gamespeed = EASY_GAMESPEED;
 822                                         }
 823                                         reset_sprites();
 824                                         reset_rocks();
 825                                         screendx = BARRIER_SPEED; screendy = 0;
 826
 827                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 828                                         ship.dx = screendx; ship.dy = screendy;
 829                                         ship.lives = 4;
 830                                         ship.flags = MOVE|DRAW|COLLIDE;
 831                                         add_sprite(SPRITE(&ship));
 832
 833                                         score = 0;
 834
 835                                         state = GAMEPLAY;
 836                                         play_tune(TUNE_GAMEPLAY);
 837                                 }
 838                         }
 839
 840                         ship.jets = 0;
 841                 }
 842
 843                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 844                         state = HIGH_SCORE_DISPLAY;
 845                         state_timeout = 400;
 846                 }
 847
 848                 tiny_sleep();
 849         }
 850 }
 851
 852 int
 853 main(int argc, char **argv) {
 854         if(!parse_opts(argc, argv)) return 1;
 855
 856         if(init()) {
 857                 printf ("vor: SDL error: '%s'\n",initerror);
 858                 return 1;
 859         }
 860
 861         start = SDL_GetTicks();
 862         frames = 0;
 863         gameloop();
 864         end = SDL_GetTicks();
 865         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 866
 867         return 0;
 868 }