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
  45 // ************************************* VARS
  46 // SDL_Surface global variables
  47 SDL_Surface
  48         *surf_screen,   // Screen
  49         *surf_b_variations, // "variations" banner
  50         *surf_b_on, // "on" banner
  51         *surf_b_rockdodger, // "rockdodger" banner
  52         *surf_b_game,   // Title element "game"
  53         *surf_b_over,   // Title element "over"
  54         *surf_life,     // Indicator of number of ships remaining
  55         *surf_rock[NROCKS],     // THE ROCKS
  56         *surf_font_big; // The big font
  57
  58
  59 font *g_font;
  60
  61 struct dot {
  62         int active;
  63         float x, y;
  64         float dx, dy;
  65         float mass;   // in DOT_MASS_UNITs
  66         float decay;  // rate at which to reduce mass.
  67         int heat;     // heat multiplier (color).
  68 };
  69
  70 struct dot edot[MAXENGINEDOTS], *dotptr = edot;
  71 struct dot bdot[MAXBANGDOTS];
  72
  73 // Other global variables
  74 char topline[1024];
  75 char *initerror = "";
  76
  77 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  78
  79 float screendx = BARRIER_SPEED, screendy = 0.0;
  80 float dist_ahead;
  81
  82 // all movement is based on t_frame.
  83 unsigned long frames, start, end;
  84 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  85 int ms_frame;   // length of this frame (milliseconds)
  86 int ms_end;     // end of this frame (milliseconds)
  87
  88 float gamespeed = 1.00;
  89
  90 int score;
  91
  92 float fadetimer = 0;
  93
  94 int pausedown = 0, paused = 0;
  95
  96 // bangdot start (bd1) and end (bd2) position:
  97 int bd1 = 0, bd2 = 0;
  98
  99 enum states {
 100         TITLE_PAGE,
 101         GAMEPLAY,
 102         DEAD_PAUSE,
 103         GAME_OVER,
 104         HIGH_SCORE_ENTRY,
 105         HIGH_SCORE_DISPLAY
 106 };
 107 enum states state = TITLE_PAGE;
 108 float state_timeout = 600.0;
 109
 110 #define NSEQUENCE 3
 111 char *msgs[2][3] = {
 112         {
 113                 "Press SPACE for normal game",
 114                 "Press '1' for easy game",
 115                 "http://jasonwoof.org/vor"
 116         },
 117         {
 118                 "Press SPACE for easy game",
 119                 "Press '2' for normal game",
 120                 "http://jasonwoof.org/vor"
 121         }
 122 };
 123
 124 int bangdotlife, nbangdots;
 125 Uint16 heatcolor[W*3];
 126
 127 char *data_dir;
 128 extern char *optarg;
 129 extern int optind, opterr, optopt;
 130
 131 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 132
 133 // ************************************* FUNCS
 134
 135 void
 136 init_engine_dots() {
 137         int i;
 138         for(i = 0; i<MAXENGINEDOTS; i++) {
 139                 edot[i].active = 0;
 140         }
 141 }
 142
 143
 144 void
 145 new_engine_dots(void) {
 146         int dir, i;
 147         int n = t_frame * ENGINE_DOTS_PER_TIC;
 148         float a, r;  // angle, random length
 149         float dx, dy;
 150         float hx, hy; // half ship width/height.
 151         static const int s[4] = { 2, 1, 0, 1 };
 152         float time;
 153         float accelh, accelv, past_ship_dx, past_ship_dy;
 154
 155         hx = ship.image->w / 2;
 156         hy = ship.image->h / 2;
 157
 158         for(dir=0; dir<4; dir++) {
 159                 if(!(ship.jets & 1<<dir)) continue;
 160
 161                 for(i = 0; i<n; i++) {
 162                         if(dotptr->active == 0) {
 163                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 164                                 r = sin(frnd()*M_PI);
 165                                 dx = r * cos(a);
 166                                 dy = r * -sin(a);  // screen y is "backwards".
 167
 168                                 dotptr->active = 1;
 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(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 206                                 else dotptr = edot;
 207                         }
 208                 }
 209         }
 210 }
 211
 212
 213 void
 214 new_bang_dots(struct sprite *s)
 215 {
 216         int i, n, x, y;
 217         uint16_t *pixel, c;
 218         uint32_t colorkey;
 219         int row_inc;
 220         double theta, r;
 221         SDL_Surface *img = s->image;
 222
 223         n = 20;
 224         pixel = img->pixels;
 225         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 226         colorkey = img->format->colorkey;
 227
 228         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 229
 230         for(i=0; i<n; i++) {
 231                 pixel = img->pixels;
 232                 for(y=0; y<img->h; y++) {
 233                         for(x = 0; x<img->w; x++) {
 234                                 c = *pixel++;
 235                                 if(c && c != colorkey) {
 236                                         theta = frnd()*M_PI*2;
 237                                         r = frnd(); r = 1 - r*r;
 238
 239                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 240                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 241                                         bdot[bd2].x = x + s->x;
 242                                         bdot[bd2].y = y + s->y;
 243                                         bdot[bd2].mass = frnd() * 99;
 244                                         bdot[bd2].decay = frnd()*1.5 + 0.5;
 245                                         bdot[bd2].heat = 3;
 246                                         bdot[bd2].active = 1;
 247
 248                                         bd2 = (bd2+1) % MAXBANGDOTS;
 249                                 }
 250                                 pixel += row_inc;
 251                         }
 252                 }
 253         }
 254
 255         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 256 }
 257
 258
 259 void
 260 move_dot(struct dot *d)
 261 {
 262         Sprite *hit;
 263         float mass;
 264
 265         if(d->active) {
 266                 d->x += (d->dx - screendx) * t_frame;
 267                 d->y += (d->dy - screendy) * t_frame;
 268                 d->mass -= t_frame * d->decay;
 269                 if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
 270                         d->active = 0;
 271                 else {
 272                         hit = pixel_collides(d->x, d->y);
 273                         if(hit && hit->type != SHIP) {
 274                                 d->active = 0;
 275                                 mass = sprite_mass(hit);
 276                                 hit->dx += DOT_MASS_UNIT * d->mass * d->dx / mass;
 277                                 hit->dy += DOT_MASS_UNIT * d->mass * d->dy / mass;
 278                         }
 279                 }
 280         }
 281 }
 282
 283 void
 284 move_dots(void)
 285 {
 286         int i;
 287
 288         for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i]);
 289         for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i]);
 290 }
 291
 292
 293 void
 294 draw_dot(struct dot *d)
 295 {
 296         uint16_t *pixels, *pixel;
 297         int row_inc;
 298
 299         if(d->active) {
 300                 pixels = (uint16_t *) surf_screen->pixels;
 301                 row_inc = surf_screen->pitch / sizeof(uint16_t);
 302                 pixel = pixels + (int)d->y * row_inc + (int)d->x;
 303                 *pixel = heatcolor[min(3*W-1, (int)(d->mass * d->heat))];
 304         }
 305 }
 306
 307 void
 308 draw_dots(void) {
 309         int i;
 310
 311         if(SDL_MUSTLOCK(surf_screen)) { SDL_LockSurface(surf_screen); }
 312         draw_dust();
 313         for(i=0; i<MAXBANGDOTS; i++) draw_dot(&bdot[i]);
 314         for(i=0; i<MAXENGINEDOTS; i++) draw_dot(&edot[i]);
 315         if(SDL_MUSTLOCK(surf_screen)) { SDL_UnlockSurface(surf_screen); }
 316 }
 317
 318 SDL_Surface *
 319 load_image(char *filename)
 320 {
 321         SDL_Surface *tmp, *img = NULL;
 322         char *s = add_data_path(filename);
 323         if(s) {
 324                 tmp = IMG_Load(s);
 325                 free(s);
 326                 if(tmp) {
 327                         img = SDL_DisplayFormat(tmp);
 328                         SDL_FreeSurface(tmp);
 329                 }
 330         }
 331         return img;
 332 }
 333
 334 void
 335 load_ship(void)
 336 {
 337         load_sprite(SPRITE(&ship), "ship.png");
 338 }
 339
 340 void font_cleanup() {
 341         font_free(g_font);
 342 }
 343
 344 int
 345 init(void) {
 346
 347         int i;
 348         char *s;
 349         Uint32 flag;
 350
 351         // Where are our data files?
 352         if(!find_files()) exit(1);
 353         read_high_score_table();
 354
 355         if(opt_sound) {
 356                 // Initialize SDL with audio and video
 357                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 358                         opt_sound = 0;
 359                         fputs("Can't open sound, starting without it\n", stderr);
 360                         atexit(SDL_Quit);
 361                 } else {
 362                         atexit(SDL_Quit);
 363                         atexit(SDL_CloseAudio);
 364                         opt_sound = init_sound();
 365                 }
 366         } else {
 367                 // Initialize with video only
 368                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 369                 atexit(SDL_Quit);
 370         }
 371
 372         play_tune(TUNE_TITLE_PAGE);
 373
 374         // Attempt to get the required video size
 375         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 376         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 377         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 378
 379         // Set the title bar text
 380         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 381
 382         NULLERROR(surf_screen);
 383
 384         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 385         for(i = 0; i<W*3; i++) {
 386                 heatcolor[i] = SDL_MapRGB(
 387                         surf_screen->format,
 388                         (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?
 389                 );
 390         }
 391
 392         // Load the banners
 393         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 394         NULLERROR(surf_b_on = load_image("b_on.png"));
 395         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 396
 397         NULLERROR(surf_b_game = load_image("b_game.png"));
 398         NULLERROR(surf_b_over = load_image("b_over.png"));
 399
 400         // Load the life indicator (small ship) graphic.
 401         NULLERROR(surf_life = load_image("life.png"));
 402
 403         // Load the font image
 404         s = add_data_path("font.png");
 405         if(s) {
 406                 g_font = font_load(s);
 407                 atexit(&font_cleanup);
 408         } else {
 409                 fprintf(stderr, "could create path to font\n");
 410                 exit(1);
 411         }
 412
 413         init_engine_dots();
 414         init_dust();
 415
 416         init_sprites();
 417         add_sprite(SPRITE(&ship));
 418
 419         // Remove the mouse cursor
 420 #ifdef SDL_DISABLE
 421         SDL_ShowCursor(SDL_DISABLE);
 422 #endif
 423
 424         return 0;
 425 }
 426
 427 void
 428 show_lives(void)
 429 {
 430         int i;
 431         SDL_Rect dest;
 432
 433         for(i=0; i<ship.lives-1; i++) {
 434                 dest.x = (i + 1)*(surf_life->w + 10);
 435                 dest.y = 20;
 436                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 437         }
 438 }
 439
 440 void
 441 draw_game_over(void)
 442 {
 443         int x;
 444         char *text0, *text1;
 445         SDL_Rect dest;
 446
 447         fadetimer += t_frame;
 448
 449         dest.x = (XSIZE-surf_b_game->w)/2;
 450         dest.y = (YSIZE-surf_b_game->h)/2-40;
 451         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 452
 453         dest.x = (XSIZE-surf_b_over->w)/2;
 454         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 455         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 456
 457         if(new_high_score(score)) {
 458                 text0 = "New High Score!";
 459                 text1 = "Press SPACE to continue";
 460         } else {
 461                 text0 = msgs[g_easy][0];
 462                 text1 = msgs[g_easy][1];
 463         }
 464
 465         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 466         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 467
 468         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 469         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 470 }
 471
 472 void
 473 draw_title_page(void)
 474 {
 475         int x;
 476         char *text;
 477         SDL_Rect dest;
 478
 479         fadetimer += t_frame/2.0;
 480
 481         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 482         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 483         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 484
 485         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 486         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 487         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 488
 489         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 490         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 491         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 492
 493         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 494         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 495         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 496
 497         text = "Version " VERSION;
 498         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 499         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 500 }
 501
 502 void
 503 draw(void)
 504 {
 505         SDL_FillRect(surf_screen,NULL,0);  // black background
 506         draw_dots();            // background dots
 507         draw_sprite(SPRITE(&ship));
 508         draw_rocks();
 509
 510         show_lives();
 511         show_score();
 512
 513         switch (state) {
 514                 case GAME_OVER: draw_game_over(); break;
 515
 516                 case TITLE_PAGE: draw_title_page(); break;
 517
 518                 case HIGH_SCORE_ENTRY: play_tune(TUNE_HIGH_SCORE_ENTRY);
 519                         // and fall through to
 520                 case HIGH_SCORE_DISPLAY:
 521                         // Display de list o high scores mon.
 522                         display_scores(150,50);
 523                         break;
 524                 case GAMEPLAY:
 525                 case DEAD_PAUSE:
 526                         ; // no action necessary
 527         }
 528
 529         // Update the surface
 530         SDL_Flip(surf_screen);
 531 }
 532
 533 static inline void
 534 kill_ship(struct ship *ship)
 535 {
 536         play_sound(SOUND_BANG);
 537         new_bang_dots(SPRITE(ship));
 538         if(--ship->lives) {
 539                 state = DEAD_PAUSE;
 540                 state_timeout = DEAD_PAUSE_LENGTH;
 541                 // want ship to be invisible, but keep drifting at sqrt(speed)
 542                 // to leave it in the middle of the space from the explosion.
 543                 ship->flags = MOVE;
 544                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 545                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 546                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 547         } else {
 548                 state = GAME_OVER;
 549                 state_timeout = 200.0;
 550                 fadetimer = 0.0;
 551                 ship->flags = 0;
 552                 // scrolling is based on the ship speed, so we need to reset it.
 553                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 554         }
 555 }
 556
 557 void
 558 do_collision(Sprite *a, Sprite *b)
 559 {
 560         if(a->type == SHIP) kill_ship((struct ship *)a);
 561         else if(b->type == SHIP) kill_ship((struct ship *)b);
 562         else bounce(a, b);
 563 }
 564
 565 void
 566 init_score_entry(void)
 567 {
 568         SDL_Event e;
 569         state = HIGH_SCORE_ENTRY;
 570         state_timeout = 5.0e6;
 571         SDL_EnableUNICODE(1);
 572         while(SDL_PollEvent(&e))
 573                 ;
 574         insert_score(score);
 575 }
 576
 577 // Count down the state timer, and change state when it gets to zero or less;
 578 void
 579 update_state(void)
 580 {
 581         state_timeout -= t_frame*3;
 582         if(state_timeout > 0) return;
 583
 584         switch(state) {
 585                 case GAMEPLAY: break;  // no action necessary
 586                 case DEAD_PAUSE:
 587                         // Restore the ship and continue playing
 588                         ship.flags = DRAW|MOVE|COLLIDE;
 589                         state = GAMEPLAY;
 590                         play_tune(TUNE_GAMEPLAY);
 591                         break;
 592                 case GAME_OVER:
 593                         if(new_high_score(score)) init_score_entry();
 594                         else {
 595                                 state = HIGH_SCORE_DISPLAY;
 596                                 state_timeout = 400;
 597                         }
 598                         break;
 599                 case HIGH_SCORE_DISPLAY:
 600                         state = TITLE_PAGE;
 601                         state_timeout = 600.0;
 602                         fadetimer = 0.0;
 603                         break;
 604                 case HIGH_SCORE_ENTRY:
 605                         break;
 606                 case TITLE_PAGE:
 607                         state = HIGH_SCORE_DISPLAY;
 608                         state_timeout = 200.0;
 609                         break;
 610         }
 611 }
 612
 613 void
 614 gameloop() {
 615         SDL_Event e;
 616         Uint8 *keystate;
 617         float tmp;
 618
 619         for(;;) {
 620                 ms_frame = SDL_GetTicks() - ms_end;
 621                 ms_end += ms_frame;
 622                 if(ms_frame > 1000) {
 623                         ms_frame = 1000;
 624                 }
 625                 t_frame = gamespeed * ms_frame / 50;
 626                 frames++;
 627
 628                 while(SDL_PollEvent(&e)) {
 629                         switch(e.type) {
 630                                 case SDL_QUIT: return;
 631                                 case SDL_KEYDOWN:
 632                                         if(state == HIGH_SCORE_ENTRY) {
 633                                                 if(!process_score_input(&e.key.keysym)) {
 634                                                         // Write the high score table to the file
 635                                                         write_high_score_table();
 636                                                         // continue to display the scores briefly
 637                                                         state = HIGH_SCORE_DISPLAY;
 638                                                         state_timeout = 200;
 639                                                         play_tune(TUNE_TITLE_PAGE);
 640                                                 }
 641                                         } else if(e.key.keysym.sym == SDLK_q) {
 642                                                 return;
 643                                         }
 644
 645                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 646                                                 return;
 647                                         }
 648                                         break;
 649                         }
 650                 }
 651                 keystate = SDL_GetKeyState(NULL);
 652
 653                 if(state == GAMEPLAY) {
 654                         if(!paused) {
 655                                 score += ms_frame;
 656
 657                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_h]) { ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;}
 658                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_t]) { ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;}
 659                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_n]) { ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;}
 660                                 if(keystate[SDLK_UP]    || keystate[SDLK_c]) { ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;}
 661                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 662                         }
 663
 664                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 665                                 if(!pausedown) {
 666                                         paused = !paused;
 667                                         pausedown = 1;
 668                                         if(!paused) ms_end = SDL_GetTicks();
 669                                 }
 670                         } else {
 671                                 pausedown = 0;
 672                         }
 673                 }
 674
 675                 if(!paused) {
 676                         update_state();
 677
 678                         // SCROLLING
 679                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 680                         screendy += tmp * t_frame/12;
 681                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 682                         screendx += tmp * t_frame/12;
 683                         // taper off so we don't hit the barrier abruptly.
 684                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 685                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 686                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 687                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 688                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 689
 690                         move_sprites();
 691                         move_dots();
 692                         move_dust();
 693
 694                         new_rocks();
 695                         new_engine_dots();
 696
 697                         collisions();
 698
 699                         // BOUNCE off left or right edge of screen
 700                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 701                                 ship.x -= (ship.dx-screendx)*t_frame;
 702                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 703                         }
 704
 705                         // BOUNCE off top or bottom of screen
 706                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 707                                 ship.y -= (ship.dy-screendy)*t_frame;
 708                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 709                         }
 710
 711                         draw();
 712
 713                         // new game
 714                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 715                            && (state == HIGH_SCORE_DISPLAY
 716                                || state == TITLE_PAGE
 717                                || state == GAME_OVER)) {
 718                                 if(state == GAME_OVER && new_high_score(score))
 719                                         init_score_entry();
 720                                 else {
 721                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 722                                                 g_easy = 0;
 723                                                 initial_rocks = NORMAL_I_ROCKS;
 724                                                 final_rocks = NORMAL_F_ROCKS;
 725                                                 if(gamespeed == EASY_GAMESPEED)
 726                                                         gamespeed = NORMAL_GAMESPEED;
 727                                         } else if(keystate[SDLK_1]) {
 728                                                 g_easy = 1;
 729                                                 initial_rocks = EASY_I_ROCKS;
 730                                                 final_rocks = EASY_F_ROCKS;
 731                                                 gamespeed = EASY_GAMESPEED;
 732                                         }
 733                                         reset_sprites();
 734                                         reset_rocks();
 735                                         screendx = BARRIER_SPEED; screendy = 0;
 736
 737                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 738                                         ship.dx = screendx; ship.dy = screendy;
 739                                         ship.lives = 4;
 740                                         ship.flags = MOVE|DRAW|COLLIDE;
 741                                         add_sprite(SPRITE(&ship));
 742
 743                                         score = 0;
 744
 745                                         state = GAMEPLAY;
 746                                         play_tune(TUNE_GAMEPLAY);
 747                                 }
 748                         }
 749
 750                         ship.jets = 0;
 751                 }
 752
 753                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 754                         state = HIGH_SCORE_DISPLAY;
 755                         state_timeout = 400;
 756                 }
 757         }
 758 }
 759
 760 int
 761 main(int argc, char **argv) {
 762         if(!parse_opts(argc, argv)) return 1;
 763
 764         if(init()) {
 765                 printf ("vor: SDL error: '%s'\n",initerror);
 766                 return 1;
 767         }
 768
 769         start = SDL_GetTicks();
 770         frames = 0;
 771         gameloop();
 772         end = SDL_GetTicks();
 773         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 774
 775         return 0;
 776 }