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