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