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 <config.h>
  36 #include "vorconfig.h"
  37 #include "dust.h"
  38 #include "file.h"
  39 #include "float.h"
  40 #include "globals.h"
  41 #include "mt.h"
  42 #include "rocks.h"
  43 #include "score.h"
  44 #include "sprite.h"
  45 #include "sound.h"
  46 #include "autopilot.h"
  47
  48 // ************************************* VARS
  49 // SDL_Surface global variables
  50 SDL_Surface
  51         *surf_screen,   // Screen
  52         *surf_b_variations, // "variations" banner
  53         *surf_b_on, // "on" banner
  54         *surf_b_rockdodger, // "rockdodger" banner
  55         *surf_b_game,   // Title element "game"
  56         *surf_b_over,   // Title element "over"
  57         *surf_life,     // Indicator of number of ships remaining
  58         *surf_rock[NROCKS],     // THE ROCKS
  59         *surf_font_big; // The big font
  60
  61
  62 font *g_font;
  63
  64 #define ENGINEDOT 0
  65 #define BANGDOT 1
  66
  67 struct dot {
  68         int active;
  69         float x, y;
  70         float dx, dy;
  71         float mass;   // in DOT_MASS_UNITs
  72         float decay;  // rate at which to reduce mass.
  73         int heat;     // heat multiplier (color).
  74         uint8_t type;  // BANGDOT or ENGINEDOT
  75 };
  76
  77 void draw(void);
  78
  79 struct dot edot[MAXENGINEDOTS], *dotptr = edot;
  80 struct dot bdot[MAXBANGDOTS];
  81
  82 // Other global variables
  83 char topline[1024];
  84 char *initerror = "";
  85 int screenshot_number = 0;
  86
  87 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  88
  89 float screendx = BARRIER_SPEED, screendy = 0.0;
  90 float dist_ahead;
  91
  92 // all movement is based on t_frame.
  93 unsigned long frames, start, end;
  94 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  95 int ms_frame;   // length of this frame (milliseconds)
  96 int ms_end;     // end of this frame (milliseconds)
  97
  98 float gamespeed = 1.00;
  99
 100 int score;
 101
 102 float fadetimer = 0;
 103
 104 int paused = 0;
 105
 106 SDL_Joystick *joy = NULL;
 107
 108 // bangdot start (bd1) and end (bd2) position:
 109 int bd1 = 0, bd2 = 0;
 110
 111 enum states {
 112         TITLE_PAGE,
 113         GAMEPLAY,
 114         DEAD_PAUSE,
 115         GAME_OVER,
 116         HIGH_SCORE_ENTRY,
 117         HIGH_SCORE_DISPLAY
 118 };
 119 enum states state = TITLE_PAGE;
 120 float state_timeout = 600.0;
 121
 122 #define NSEQUENCE 3
 123 char *msgs[2][3] = {
 124         {
 125                 "Press SPACE for normal game",
 126                 "Press '1' for easy game",
 127                 "http://jasonwoof.org/vor"
 128         },
 129         {
 130                 "Press SPACE for easy game",
 131                 "Press '2' for normal game",
 132                 "http://jasonwoof.org/vor"
 133         }
 134 };
 135
 136 int bangdotlife, nbangdots;
 137 Uint16 heatcolor[W*3];
 138
 139 char *data_dir;
 140 extern char *optarg;
 141 extern int optind, opterr, optopt;
 142
 143 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 144
 145 // ************************************* FUNCS
 146
 147 #ifdef HAVE_NANOSLEEP
 148 void
 149 tiny_sleep() {
 150         struct timespec t;
 151         t.tv_sec = 0;
 152         t.tv_nsec = 1;
 153         nanosleep(&t, 0);
 154 }
 155 #else
 156 #define tiny_sleep()
 157 #endif
 158
 159 void
 160 init_dots() {
 161         int i;
 162         for(i = 0; i<MAXENGINEDOTS; i++) {
 163                 edot[i].active = 0;
 164                 edot[i].type = ENGINEDOT;
 165         }
 166         for(i = 0; i<MAXBANGDOTS; i++) {
 167                 bdot[i].active = 0;
 168                 bdot[i].type = BANGDOT;
 169         }
 170 }
 171
 172
 173 void
 174 new_engine_dots(void) {
 175         int dir, i;
 176         int n = t_frame * ENGINE_DOTS_PER_TIC;
 177         float a, r;  // angle, random length
 178         float dx, dy;
 179         float hx, hy; // half ship width/height.
 180         static const int s[4] = { 2, 1, 0, 1 };
 181         float time;
 182         float accelh, accelv, past_ship_dx, past_ship_dy;
 183
 184         hx = ship.image->w / 2;
 185         hy = ship.image->h / 2;
 186
 187         for(dir=0; dir<4; dir++) {
 188                 if(!(ship.jets & 1<<dir)) continue;
 189
 190                 for(i = 0; i<n; i++) {
 191                         if(dotptr->active == 0) {
 192                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 193                                 r = sin(frnd()*M_PI);
 194                                 dx = r * cos(a);
 195                                 dy = r * -sin(a);  // screen y is "backwards".
 196
 197                                 dotptr->decay = 3;
 198                                 dotptr->heat = 6;
 199
 200                                 // dot was created at a random time during the time span
 201                                 time = frnd() * t_frame; // this is how long ago
 202
 203                                 // calculate how fast the ship was going when this engine dot was
 204                                 // created (as if it had a smooth acceleration). This is used in
 205                                 // determining the velocity of the dots, but not their starting
 206                                 // location.
 207                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 208                                 accelh *= THRUSTER_STRENGTH * time;
 209                                 past_ship_dx = ship.dx - accelh;
 210                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 211                                 accelv *= THRUSTER_STRENGTH * time;
 212                                 past_ship_dy = ship.dy - accelv;
 213
 214                                 // the starting position (not speed) of the dot is calculated as
 215                                 // though the ship were traveling at a constant speed for this
 216                                 // t_frame.
 217                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 218                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 219                                 if(dir&1) {
 220                                         dotptr->dx = past_ship_dx + 2*dx;
 221                                         dotptr->dy = past_ship_dy + 20*dy;
 222                                         dotptr->mass = 60 * fabs(dy);
 223                                 } else {
 224                                         dotptr->dx = past_ship_dx + 20*dx;
 225                                         dotptr->dy = past_ship_dy + 2*dy;
 226                                         dotptr->mass = 60 * fabs(dx);
 227                                 }
 228
 229                                 // move the dot as though it were created in the past
 230                                 dotptr->x += (dotptr->dx - screendx) * time;
 231                                 dotptr->y += (dotptr->dy - screendy) * time;
 232
 233                                 if(!fclip(dotptr->x, XSIZE) && !fclip(dotptr->y, YSIZE)) {
 234                                         dotptr->active = 1;
 235                                         if(dotptr - edot < MAXENGINEDOTS-1) {
 236                                                 dotptr++;
 237                                         } else {
 238                                                 dotptr = edot;
 239                                         }
 240                                 }
 241                         }
 242                 }
 243         }
 244 }
 245
 246
 247 void
 248 new_bang_dots(struct sprite *s)
 249 {
 250         int i, n, x, y;
 251         uint16_t *pixel, c;
 252         uint32_t colorkey;
 253         int row_inc;
 254         double theta, r;
 255         SDL_Surface *img = s->image;
 256
 257         n = 20;
 258         pixel = img->pixels;
 259         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 260         colorkey = img->format->colorkey;
 261
 262         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 263
 264         for(i=0; i<n; i++) {
 265                 pixel = img->pixels;
 266                 for(y=0; y<img->h; y++) {
 267                         for(x = 0; x<img->w; x++) {
 268                                 c = *pixel++;
 269                                 if(c && c != colorkey) {
 270                                         theta = frnd()*M_PI*2;
 271                                         r = frnd(); r = 1 - r*r;
 272
 273                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 274                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 275                                         bdot[bd2].x = x + s->x;
 276                                         bdot[bd2].y = y + s->y;
 277                                         bdot[bd2].mass = frnd() * 99;
 278                                         bdot[bd2].decay = frnd()*1.5 + 0.5;
 279                                         bdot[bd2].heat = 3;
 280                                         bdot[bd2].active = 1;
 281
 282                                         bd2 = (bd2+1) % MAXBANGDOTS;
 283                                 }
 284                                 pixel += row_inc;
 285                         }
 286                 }
 287         }
 288
 289         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 290 }
 291
 292 void
 293 kill_rock(struct rock *r) {
 294         r->x = -200;
 295 }
 296
 297 void
 298 move_dot(struct dot *d)
 299 {
 300         Sprite *hit;
 301         float mass;
 302
 303         if(d->active) {
 304                 d->x += (d->dx - screendx) * t_frame;
 305                 d->y += (d->dy - screendy) * t_frame;
 306                 d->mass -= t_frame * d->decay;
 307                 if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
 308                         d->active = 0;
 309                 else {
 310                         hit = pixel_collides(d->x, d->y);
 311                         if(hit) if(hit->type != SHIP) {
 312                                 d->active = 0;
 313                                 mass = sprite_mass(hit);
 314                                 if(d->type == BANGDOT) {
 315                                         struct rock *rock = (struct rock*)hit;
 316                                         rock->life -= (d->dx - hit->dx) * (d->dx - hit->dx) + (d->dy - hit->dy) * (d->dy - hit->dy);
 317                                         if(rock->life < 0) {
 318                                                 kill_rock(rock);
 319                                         }
 320                                 }
 321                                 hit->dx += DOT_MASS_UNIT * d->mass * (d->dx - hit->dx) / mass;
 322                                 hit->dy += DOT_MASS_UNIT * d->mass * (d->dy - hit->dy) / mass;
 323                         }
 324                 }
 325         }
 326 }
 327
 328 void
 329 move_dots(void)
 330 {
 331         int i;
 332
 333         for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i]);
 334         for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i]);
 335 }
 336
 337
 338 void
 339 draw_dot(struct dot *d)
 340 {
 341         uint16_t *pixels, *pixel;
 342         int row_inc;
 343
 344         if(d->active) {
 345                 pixels = (uint16_t *) surf_screen->pixels;
 346                 row_inc = surf_screen->pitch / sizeof(uint16_t);
 347                 pixel = pixels + (int)d->y * row_inc + (int)d->x;
 348                 *pixel = heatcolor[min(3*W-1, (int)(d->mass * d->heat))];
 349         }
 350 }
 351
 352 void
 353 draw_dots(void) {
 354         int i;
 355
 356         if(SDL_MUSTLOCK(surf_screen)) { SDL_LockSurface(surf_screen); }
 357         draw_dust();
 358         for(i=0; i<MAXBANGDOTS; i++) draw_dot(&bdot[i]);
 359         for(i=0; i<MAXENGINEDOTS; i++) draw_dot(&edot[i]);
 360         if(SDL_MUSTLOCK(surf_screen)) { SDL_UnlockSurface(surf_screen); }
 361 }
 362
 363 SDL_Surface *
 364 load_image(char *filename)
 365 {
 366         SDL_Surface *tmp, *img = NULL;
 367         char *s = add_data_path(filename);
 368         if(s) {
 369                 tmp = IMG_Load(s);
 370                 free(s);
 371                 if(tmp) {
 372                         img = SDL_DisplayFormat(tmp);
 373                         SDL_FreeSurface(tmp);
 374                 }
 375         }
 376         return img;
 377 }
 378
 379 void
 380 load_ship(void)
 381 {
 382         load_sprite(SPRITE(&ship), "ship.png");
 383 }
 384
 385 void font_cleanup() {
 386         font_free(g_font);
 387 }
 388
 389 void
 390 set_video_mode() {
 391         Uint32 flag;
 392
 393         // Attempt to get the required video size
 394         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 395         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 396         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 397 }
 398
 399 void
 400 toggle_fullscreen() {
 401         opt_fullscreen = 1 - opt_fullscreen;
 402         set_video_mode();
 403         if(paused) {
 404                 draw();
 405         }
 406 }
 407
 408
 409 int
 410 init(void) {
 411
 412         int i;
 413         char *s;
 414
 415         // Where are our data files?
 416         if(!find_files()) exit(1);
 417         read_high_score_table();
 418
 419         if(opt_sound) {
 420                 // Initialize SDL with audio and video
 421                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_JOYSTICK) != 0) {
 422                         opt_sound = 0;
 423                         fputs("Can't open sound, starting without it\n", stderr);
 424                         atexit(SDL_Quit);
 425                 } else {
 426                         atexit(SDL_Quit);
 427                         atexit(SDL_CloseAudio);
 428                         opt_sound = init_sound();
 429                 }
 430         } else {
 431                 // Initialize with video only
 432                 CONDERROR(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) != 0);
 433                 atexit(SDL_Quit);
 434         }
 435
 436         play_tune(TUNE_TITLE_PAGE);
 437
 438
 439         // Attempt to get the required video size
 440         set_video_mode();
 441
 442         // Set the title bar text
 443         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 444
 445         NULLERROR(surf_screen);
 446
 447         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 448         for(i = 0; i<W*3; i++) {
 449                 heatcolor[i] = SDL_MapRGB(
 450                         surf_screen->format,
 451                         (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?
 452                 );
 453         }
 454
 455         // Load the banners
 456         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 457         NULLERROR(surf_b_on = load_image("b_on.png"));
 458         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 459
 460         NULLERROR(surf_b_game = load_image("b_game.png"));
 461         NULLERROR(surf_b_over = load_image("b_over.png"));
 462
 463         // Load the life indicator (small ship) graphic.
 464         NULLERROR(surf_life = load_image("life.png"));
 465
 466         // Load the font image
 467         s = add_data_path("font.png");
 468         if(s) {
 469                 g_font = font_load(s);
 470                 atexit(&font_cleanup);
 471         } else {
 472                 fprintf(stderr, "could create path to font\n");
 473                 exit(1);
 474         }
 475
 476         if(SDL_NumJoysticks() > 0)
 477         {
 478                 NULLERROR(joy = SDL_JoystickOpen(0));
 479         }
 480
 481         init_dots();
 482         init_dust();
 483
 484         init_sprites();
 485         add_sprite(SPRITE(&ship));
 486
 487         // Remove the mouse cursor
 488 #ifdef SDL_DISABLE
 489         SDL_ShowCursor(SDL_DISABLE);
 490 #endif
 491
 492         return 0;
 493 }
 494
 495 void
 496 show_lives(void)
 497 {
 498         int i;
 499         SDL_Rect dest;
 500
 501         for(i=0; i<ship.lives-1; i++) {
 502                 dest.x = (i + 1)*(surf_life->w + 10);
 503                 dest.y = 20;
 504                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 505         }
 506 }
 507
 508 void
 509 draw_game_over(void)
 510 {
 511         int x;
 512         char *text0, *text1;
 513         SDL_Rect dest;
 514
 515         fadetimer += t_frame;
 516
 517         dest.x = (XSIZE-surf_b_game->w)/2;
 518         dest.y = (YSIZE-surf_b_game->h)/2-40;
 519         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 520
 521         dest.x = (XSIZE-surf_b_over->w)/2;
 522         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 523         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 524
 525         if(new_high_score(score)) {
 526                 text0 = "New High Score!";
 527                 text1 = "Press SPACE to continue";
 528         } else {
 529                 text0 = msgs[g_easy][0];
 530                 text1 = msgs[g_easy][1];
 531         }
 532
 533         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 534         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 535
 536         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 537         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 538 }
 539
 540 void
 541 draw_title_page(void)
 542 {
 543         int x;
 544         char *text;
 545         SDL_Rect dest;
 546
 547         fadetimer += t_frame/2.0;
 548
 549         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 550         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 551         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 552
 553         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 554         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 555         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 556
 557         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 558         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 559         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 560
 561         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 562         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 563         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 564
 565         text = "Version " PACKAGE_VERSION;
 566         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 567         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 568 }
 569
 570 void
 571 draw(void)
 572 {
 573         SDL_FillRect(surf_screen,NULL,0);  // black background
 574         draw_dots();            // background dots
 575         draw_sprite(SPRITE(&ship));
 576         draw_rocks();
 577
 578         show_lives();
 579         show_score();
 580
 581         switch (state) {
 582                 case GAME_OVER:
 583                         draw_game_over();
 584                         break;
 585
 586                 case TITLE_PAGE:
 587                         draw_title_page();
 588                         break;
 589
 590                 case HIGH_SCORE_ENTRY:
 591                 case HIGH_SCORE_DISPLAY:
 592                         display_scores(150,50);
 593                         break;
 594
 595                 case GAMEPLAY:
 596                 case DEAD_PAUSE:
 597                         ; // no action necessary
 598         }
 599
 600         // Update the surface
 601         SDL_Flip(surf_screen);
 602 }
 603
 604 static inline void
 605 kill_ship(struct ship *ship)
 606 {
 607         play_sound(SOUND_BANG);
 608         new_bang_dots(SPRITE(ship));
 609         if(--ship->lives) {
 610                 state = DEAD_PAUSE;
 611                 state_timeout = DEAD_PAUSE_LENGTH;
 612                 // want ship to be invisible, but keep drifting at sqrt(speed)
 613                 // to leave it in the middle of the space from the explosion.
 614                 ship->flags = MOVE;
 615                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 616                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 617                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 618         } else {
 619                 state = GAME_OVER;
 620                 play_tune(TUNE_TITLE_PAGE);
 621                 state_timeout = 200.0;
 622                 fadetimer = 0.0;
 623                 ship->flags = 0;
 624                 // scrolling is based on the ship speed, so we need to reset it.
 625                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 626         }
 627 }
 628
 629 void
 630 do_collision(Sprite *a, Sprite *b)
 631 {
 632         if(a->type == SHIP) kill_ship((struct ship *)a);
 633         else if(b->type == SHIP) kill_ship((struct ship *)b);
 634         else bounce(a, b);
 635 }
 636
 637 void
 638 init_score_entry(void)
 639 {
 640         SDL_Event e;
 641         state = HIGH_SCORE_ENTRY;
 642         state_timeout = 5.0e6;
 643         SDL_EnableUNICODE(1);
 644         while(SDL_PollEvent(&e))
 645                 ;
 646         insert_score(score);
 647 }
 648
 649 // Count down the state timer, and change state when it gets to zero or less;
 650 void
 651 update_state(void)
 652 {
 653         state_timeout -= t_frame*3;
 654         if(state_timeout > 0) return;
 655
 656         switch(state) {
 657                 case GAMEPLAY: break;  // no action necessary
 658                 case DEAD_PAUSE:
 659                         // Restore the ship and continue playing
 660                         ship.flags = DRAW|MOVE|COLLIDE;
 661                         state = GAMEPLAY;
 662                         break;
 663                 case GAME_OVER:
 664                         if(new_high_score(score)) init_score_entry();
 665                         else {
 666                                 state = HIGH_SCORE_DISPLAY;
 667                                 state_timeout = 400;
 668                         }
 669                         break;
 670                 case HIGH_SCORE_DISPLAY:
 671                         state = TITLE_PAGE;
 672                         state_timeout = 600.0;
 673                         fadetimer = 0.0;
 674                         break;
 675                 case HIGH_SCORE_ENTRY:
 676                         break;
 677                 case TITLE_PAGE:
 678                         state = HIGH_SCORE_DISPLAY;
 679                         state_timeout = 200.0;
 680                         break;
 681         }
 682 }
 683
 684 void
 685 gameloop() {
 686         SDL_Event e;
 687         Uint8 *keystate;
 688         Sint16 x_move, y_move;
 689         char button_pressed;
 690         short i;
 691         float tmp;
 692
 693         for(;;) {
 694                 ms_frame = SDL_GetTicks() - ms_end;
 695                 ms_end += ms_frame;
 696                 if(ms_frame > 50) {
 697                         ms_frame = 50;
 698                 }
 699                 t_frame = gamespeed * ms_frame / 50;
 700                 frames++;
 701
 702                 if(opt_autopilot) {
 703                         autopilot(t_frame);
 704                 }
 705
 706                 while(paused ? SDL_WaitEvent(&e) : SDL_PollEvent(&e)) {
 707                         switch(e.type) {
 708                                 case SDL_QUIT: return;
 709                                 case SDL_KEYDOWN:
 710                                         // even during high-score entry
 711                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 712                                                 return;
 713                                         }
 714
 715                                         if(state == HIGH_SCORE_ENTRY) {
 716                                                 if(!process_score_input(&e.key.keysym)) {
 717                                                         // Write the high score table to the file
 718                                                         write_high_score_table();
 719                                                         // continue to display the scores briefly
 720                                                         state = HIGH_SCORE_DISPLAY;
 721                                                         state_timeout = 200;
 722                                                 }
 723                                         } else {
 724                                                 switch(e.key.keysym.sym) {
 725                                                         case SDLK_q:
 726                                                                 return;
 727                                                         case SDLK_3:
 728                                                         case SDLK_PRINT:
 729                                                                 {
 730                                                                         FILE *screenshot_fp;
 731                                                                         char tmp[30];
 732                                                                         char *screenshot_filename = &(tmp[0]);
 733                                                                         for(;;) {
 734                                                                                 snprintf(screenshot_filename, 30, "vor-screenshot-%02i.bmp", screenshot_number++);
 735                                                                                 screenshot_fp = fopen(screenshot_filename, "r");
 736                                                                                 if(screenshot_fp) {
 737                                                                                         fclose(screenshot_fp);
 738                                                                                 } else {
 739                                                                                         break;
 740                                                                                 }
 741                                                                         }
 742                                                                         SDL_SaveBMP(surf_screen, screenshot_filename);
 743                                                                 }
 744                                                                 break;
 745                                                         case SDLK_SPACE:
 746                                                                 if(state != GAMEPLAY && state != DEAD_PAUSE) {
 747                                                                         // don't conflict with space key to start a new game
 748                                                                         break;
 749                                                                 }
 750                                                                 // else fall through
 751                                                         case SDLK_p:
 752                                                         case SDLK_PAUSE:
 753                                                                 paused = !paused;
 754                                                                 if(paused) {
 755                                                                         pause_tune();
 756                                                                 } else {
 757                                                                         resume_tune();
 758                                                                         ms_end = SDL_GetTicks();
 759                                                                 }
 760                                                                 break;
 761                                                         case SDLK_f:
 762                                                         case SDLK_F11:
 763                                                                 toggle_fullscreen();
 764                                                                 break;
 765                                                         default:
 766                                                                 // other keys are handled by checking keystate each frame
 767                                                                 break;
 768                                                 }
 769                                         }
 770                                         break;
 771                         }
 772                 }
 773                 keystate = SDL_GetKeyState(NULL);
 774                 SDL_JoystickUpdate();
 775                 x_move = SDL_JoystickGetAxis(joy, 4);
 776                 y_move = SDL_JoystickGetAxis(joy, 5);
 777                 button_pressed = 0;
 778                 for(i = 1; i <= SDL_JoystickNumButtons(joy); i++)
 779                 {
 780                         if(SDL_JoystickGetButton(joy, i) == 1)
 781                         {
 782                                 button_pressed = 1;
 783                                 break;
 784                         }
 785                 }
 786
 787                 if(opt_autopilot) {
 788                         autopilot_fix_keystates(keystate);
 789                 }
 790
 791                 if(state == GAMEPLAY) {
 792                         if(!paused) {
 793                                 score += ms_frame;
 794
 795                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_KP4]) {
 796                                         ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;
 797                                 }
 798                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_KP5] || keystate[SDLK_KP2]) {
 799                                         ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;
 800                                 }
 801                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_KP6]) {
 802                                         ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;
 803                                 }
 804                                 if(keystate[SDLK_UP]    || keystate[SDLK_KP8]) {
 805                                         ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;
 806                                 }
 807                                 if(x_move < -3000) { ship.dx += x_move*THRUSTER_STRENGTH*t_frame/32768; ship.jets |= 1<<0;}
 808                                 if(y_move >  3000) { ship.dy += y_move*THRUSTER_STRENGTH*t_frame/32768; ship.jets |= 1<<1;}
 809                                 if(x_move >  3000) { ship.dx += x_move*THRUSTER_STRENGTH*t_frame/32768; ship.jets |= 1<<2;}
 810                                 if(y_move < -3000) { ship.dy += y_move*THRUSTER_STRENGTH*t_frame/32768; ship.jets |= 1<<3;}
 811                                 if(ship.jets) {
 812                                         ship.dx = fconstrain2(ship.dx, -50, 50);
 813                                         ship.dy = fconstrain2(ship.dy, -50, 50);
 814                                 }
 815                         }
 816
 817                 }
 818
 819                 if(!paused) {
 820                         update_state();
 821
 822                         // SCROLLING
 823                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 824                         screendy += tmp * t_frame/12;
 825                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 826                         screendx += tmp * t_frame/12;
 827                         // taper off so we don't hit the barrier abruptly.
 828                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 829                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 830                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 831                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 832                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 833
 834                         move_sprites();
 835                         move_dots();
 836                         move_dust();
 837
 838                         new_rocks();
 839
 840                         // BOUNCE off left or right edge of screen
 841                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 842                                 ship.x -= (ship.dx-screendx)*t_frame;
 843                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 844                                 ship.x = fconstrain(ship.x, XSIZE - ship.w);
 845                         }
 846
 847                         // BOUNCE off top or bottom of screen
 848                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 849                                 ship.y -= (ship.dy-screendy)*t_frame;
 850                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 851                                 ship.y = fconstrain(ship.y, YSIZE - ship.h);
 852                         }
 853
 854                         new_engine_dots();
 855
 856                         collisions(); // must happen after ship bouncing because it puts pixels where the ship is (thus the ship must be on the screen)
 857
 858
 859                         draw();
 860
 861                         // new game
 862                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2] || button_pressed)
 863                            && (state == HIGH_SCORE_DISPLAY
 864                                || state == TITLE_PAGE
 865                                || state == GAME_OVER)) {
 866                                 if(state == GAME_OVER && new_high_score(score))
 867                                         init_score_entry();
 868                                 else {
 869                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2] || button_pressed) {
 870                                                 g_easy = 0;
 871                                                 initial_rocks = NORMAL_I_ROCKS;
 872                                                 final_rocks = NORMAL_F_ROCKS;
 873                                                 if(gamespeed == EASY_GAMESPEED)
 874                                                         gamespeed = NORMAL_GAMESPEED;
 875                                         } else if(keystate[SDLK_1]) {
 876                                                 g_easy = 1;
 877                                                 initial_rocks = EASY_I_ROCKS;
 878                                                 final_rocks = EASY_F_ROCKS;
 879                                                 gamespeed = EASY_GAMESPEED;
 880                                         }
 881                                         reset_sprites();
 882                                         reset_rocks();
 883                                         screendx = BARRIER_SPEED; screendy = 0;
 884
 885                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 886                                         ship.dx = screendx; ship.dy = screendy;
 887                                         ship.lives = 4;
 888                                         ship.flags = MOVE|DRAW|COLLIDE;
 889                                         add_sprite(SPRITE(&ship));
 890
 891                                         score = 0;
 892
 893                                         state = GAMEPLAY;
 894                                         play_tune(TUNE_GAMEPLAY);
 895                                 }
 896                         }
 897
 898                         ship.jets = 0;
 899                 }
 900
 901                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 902                         state = HIGH_SCORE_DISPLAY;
 903                         state_timeout = 400;
 904                 }
 905
 906                 tiny_sleep();
 907         }
 908 }
 909
 910 int
 911 main(int argc, char **argv) {
 912         if(!parse_opts(argc, argv)) return 1;
 913
 914         if(init()) {
 915                 printf ("vor: SDL error: '%s'\n",initerror);
 916                 return 1;
 917         }
 918
 919         start = SDL_GetTicks();
 920         frames = 0;
 921         gameloop();
 922         end = SDL_GetTicks();
 923         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 924
 925         return 0;
 926 }