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