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 };
  68
  69 struct dot edot[MAXENGINEDOTS], *dotptr = edot;
  70 struct dot bdot[MAXBANGDOTS];
  71
  72 // Other global variables
  73 char topline[1024];
  74 char *initerror = "";
  75
  76 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  77
  78 float screendx = BARRIER_SPEED, screendy = 0.0;
  79 float dist_ahead;
  80
  81 // all movement is based on t_frame.
  82 unsigned long frames, start, end;
  83 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  84 int ms_frame;   // length of this frame (milliseconds)
  85 int ms_end;     // end of this frame (milliseconds)
  86
  87 float gamespeed = 1.00;
  88
  89 int score;
  90
  91 float fadetimer = 0;
  92
  93 int pausedown = 0, paused = 0;
  94
  95 // bangdot start (bd1) and end (bd2) position:
  96 int bd1 = 0, bd2 = 0;
  97
  98 enum states {
  99         TITLE_PAGE,
 100         GAMEPLAY,
 101         DEAD_PAUSE,
 102         GAME_OVER,
 103         HIGH_SCORE_ENTRY,
 104         HIGH_SCORE_DISPLAY
 105 };
 106 enum states state = TITLE_PAGE;
 107 float state_timeout = 600.0;
 108
 109 #define NSEQUENCE 3
 110 char *msgs[2][3] = {
 111         {
 112                 "Press SPACE for normal game",
 113                 "Press '1' for easy game",
 114                 "http://jasonwoof.org/vor"
 115         },
 116         {
 117                 "Press SPACE for easy game",
 118                 "Press '2' for normal game",
 119                 "http://jasonwoof.org/vor"
 120         }
 121 };
 122
 123 int bangdotlife, nbangdots;
 124 Uint16 heatcolor[W*3];
 125
 126 char *data_dir;
 127 extern char *optarg;
 128 extern int optind, opterr, optopt;
 129
 130 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 131
 132 // ************************************* FUNCS
 133
 134 void
 135 init_engine_dots() {
 136         int i;
 137         for(i = 0; i<MAXENGINEDOTS; i++) {
 138                 edot[i].active = 0;
 139         }
 140 }
 141
 142
 143 void
 144 new_engine_dots(float time_span) {
 145         int dir, i;
 146         int n = time_span * ENGINE_DOTS_PER_TIC;
 147         float a, r;  // angle, random length
 148         float dx, dy;
 149         float hx, hy; // half ship width/height.
 150         static const int s[4] = { 2, 1, 0, 1 };
 151         float time;
 152         float accelh, accelv, past_ship_dx, past_ship_dy;
 153
 154         hx = ship.image->w / 2;
 155         hy = ship.image->h / 2;
 156
 157         for(dir=0; dir<4; dir++) {
 158                 if(!(ship.jets & 1<<dir)) continue;
 159
 160                 for(i = 0; i<n; i++) {
 161                         if(dotptr->active == 0) {
 162                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 163                                 r = sin(frnd()*M_PI);
 164                                 dx = r * cos(a);
 165                                 dy = r * -sin(a);  // screen y is "backwards".
 166
 167                                 dotptr->active = 1;
 168                                 dotptr->decay = 3;
 169
 170                                 // dot was created at a random time during the time span
 171                                 time = frnd() * time_span; // this is how long ago
 172
 173                                 // calculate how fast the ship was going when this engine dot was
 174                                 // created (as if it had a smooth acceleration). This is used in
 175                                 // determining the velocity of the dots, but not their starting
 176                                 // location.
 177                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 178                                 accelh *= THRUSTER_STRENGTH * time;
 179                                 past_ship_dx = ship.dx - accelh;
 180                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 181                                 accelv *= THRUSTER_STRENGTH * time;
 182                                 past_ship_dy = ship.dy - accelv;
 183
 184                                 // the starting position (not speed) of the dot is calculated as
 185                                 // though the ship were traveling at a constant speed for this
 186                                 // time_span.
 187                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 188                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 189                                 if(dir&1) {
 190                                         dotptr->dx = past_ship_dx + 2*dx;
 191                                         dotptr->dy = past_ship_dy + 20*dy;
 192                                         dotptr->mass = 60 * fabs(dy);
 193                                 } else {
 194                                         dotptr->dx = past_ship_dx + 20*dx;
 195                                         dotptr->dy = past_ship_dy + 2*dy;
 196                                         dotptr->mass = 60 * fabs(dx);
 197                                 }
 198
 199                                 // move the dot as though it were created in the past
 200                                 dotptr->x += (dotptr->dx - screendx) * time;
 201                                 dotptr->y += (dotptr->dy - screendy) * time;
 202
 203                                 if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 204                                 else dotptr = edot;
 205                         }
 206                 }
 207         }
 208 }
 209
 210
 211 void
 212 new_bang_dots(struct sprite *s)
 213 {
 214         int i, n, x, y;
 215         uint16_t *pixel, c;
 216         uint32_t colorkey;
 217         int row_inc;
 218         double theta, r;
 219         SDL_Surface *img = s->image;
 220
 221         n = 20;
 222         pixel = img->pixels;
 223         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 224         colorkey = img->format->colorkey;
 225
 226         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 227
 228         for(i=0; i<n; i++) {
 229                 pixel = img->pixels;
 230                 for(y=0; y<img->h; y++) {
 231                         for(x = 0; x<img->w; x++) {
 232                                 c = *pixel++;
 233                                 if(c && c != colorkey) {
 234                                         theta = frnd()*M_PI*2;
 235                                         r = frnd(); r = 1 - r*r;
 236
 237                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 238                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 239                                         bdot[bd2].x = x + s->x;
 240                                         bdot[bd2].y = y + s->y;
 241                                         bdot[bd2].mass = frnd() * 99;
 242                                         bdot[bd2].decay = frnd()*1.5 + 0.5;
 243                                         bdot[bd2].active = 1;
 244
 245                                         bd2 = (bd2+1) % MAXBANGDOTS;
 246                                 }
 247                                 pixel += row_inc;
 248                         }
 249                 }
 250         }
 251
 252         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 253 }
 254
 255
 256 void
 257 move_dot(struct dot *d, float ticks)
 258 {
 259         Sprite *hit;
 260         float mass;
 261
 262         if(d->active) {
 263                 d->x += (d->dx - screendx) * ticks;
 264                 d->y += (d->dy - screendy) * ticks;
 265                 d->mass -= ticks * d->decay;
 266                 if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
 267                         d->active = 0;
 268                 else {
 269                         hit = pixel_collides(d->x, d->y);
 270                         if(hit && hit->type != SHIP) {
 271                                 d->active = 0;
 272                                 mass = sprite_mass(hit);
 273                                 hit->dx += DOT_MASS_UNIT * d->mass * d->dx / mass;
 274                                 hit->dy += DOT_MASS_UNIT * d->mass * d->dy / mass;
 275                         }
 276                 }
 277         }
 278 }
 279
 280 void
 281 move_dots(float ticks)
 282 {
 283         int i;
 284
 285         for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i], ticks);
 286         for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i], ticks);
 287 }
 288
 289
 290 void
 291 draw_bang_dots(SDL_Surface *s)
 292 {
 293         int i;
 294         uint16_t *pixels, *pixel;
 295         int row_inc = s->pitch/sizeof(uint16_t);
 296
 297         pixels = (uint16_t *) s->pixels;
 298
 299         for(i=0; i<MAXBANGDOTS; i++) {
 300                 if(!bdot[i].active) continue;
 301                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 302                 *pixel = heatcolor[(int)(bdot[i].mass)*3];
 303         }
 304 }
 305
 306 void
 307 draw_engine_dots(SDL_Surface *s)
 308 {
 309         int i;
 310         uint16_t *pixels, *pixel;
 311         int row_inc = s->pitch/sizeof(uint16_t);
 312
 313         pixels = (uint16_t *) s->pixels;
 314
 315         for(i = 0; i<MAXENGINEDOTS; i++) {
 316                 if(!edot[i].active) continue;
 317                 pixel = pixels + row_inc*(int)(edot[i].y) + (int)(edot[i].x);
 318                 *pixel = heatcolor[min(3*W-1, (int)(edot[i].mass)*6)];
 319         }
 320 }
 321
 322 void
 323 draw_dots(SDL_Surface *s) {
 324         if(SDL_MUSTLOCK(s)) { SDL_LockSurface(s); }
 325         draw_dust(s);
 326         draw_engine_dots(s);
 327         draw_bang_dots(s);
 328         if(SDL_MUSTLOCK(s)) { SDL_UnlockSurface(s); }
 329 }
 330
 331 SDL_Surface *
 332 load_image(char *filename)
 333 {
 334         SDL_Surface *tmp, *img = NULL;
 335         char *s = add_data_path(filename);
 336         if(s) {
 337                 tmp = IMG_Load(s);
 338                 free(s);
 339                 if(tmp) {
 340                         img = SDL_DisplayFormat(tmp);
 341                         SDL_FreeSurface(tmp);
 342                 }
 343         }
 344         return img;
 345 }
 346
 347 void
 348 load_ship(void)
 349 {
 350         load_sprite(SPRITE(&ship), "ship.png");
 351 }
 352
 353 void font_cleanup() {
 354         font_free(g_font);
 355 }
 356
 357 int
 358 init(void) {
 359
 360         int i;
 361         char *s;
 362         Uint32 flag;
 363
 364         // Where are our data files?
 365         if(!find_files()) exit(1);
 366         read_high_score_table();
 367
 368         if(opt_sound) {
 369                 // Initialize SDL with audio and video
 370                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 371                         opt_sound = 0;
 372                         fputs("Can't open sound, starting without it\n", stderr);
 373                         atexit(SDL_Quit);
 374                 } else {
 375                         atexit(SDL_Quit);
 376                         atexit(SDL_CloseAudio);
 377                         opt_sound = init_sound();
 378                 }
 379         } else {
 380                 // Initialize with video only
 381                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 382                 atexit(SDL_Quit);
 383         }
 384
 385         play_tune(TUNE_TITLE_PAGE);
 386
 387         // Attempt to get the required video size
 388         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 389         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 390         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 391
 392         // Set the title bar text
 393         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 394
 395         NULLERROR(surf_screen);
 396
 397         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 398         for(i = 0; i<W*3; i++) {
 399                 heatcolor[i] = SDL_MapRGB(
 400                         surf_screen->format,
 401                         (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?
 402                 );
 403         }
 404
 405         // Load the banners
 406         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 407         NULLERROR(surf_b_on = load_image("b_on.png"));
 408         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 409
 410         NULLERROR(surf_b_game = load_image("b_game.png"));
 411         NULLERROR(surf_b_over = load_image("b_over.png"));
 412
 413         // Load the life indicator (small ship) graphic.
 414         NULLERROR(surf_life = load_image("life.png"));
 415
 416         // Load the font image
 417         s = add_data_path("font.png");
 418         if(s) {
 419                 g_font = font_load(s);
 420                 atexit(&font_cleanup);
 421         } else {
 422                 fprintf(stderr, "could create path to font\n");
 423                 exit(1);
 424         }
 425
 426         init_engine_dots();
 427         init_dust();
 428
 429         init_sprites();
 430         add_sprite(SPRITE(&ship));
 431
 432         // Remove the mouse cursor
 433 #ifdef SDL_DISABLE
 434         SDL_ShowCursor(SDL_DISABLE);
 435 #endif
 436
 437         return 0;
 438 }
 439
 440 void
 441 show_lives(void)
 442 {
 443         int i;
 444         SDL_Rect dest;
 445
 446         for(i=0; i<ship.lives-1; i++) {
 447                 dest.x = (i + 1)*(surf_life->w + 10);
 448                 dest.y = 20;
 449                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 450         }
 451 }
 452
 453 void
 454 draw_game_over(void)
 455 {
 456         int x;
 457         char *text0, *text1;
 458         SDL_Rect dest;
 459
 460         fadetimer += t_frame;
 461
 462         dest.x = (XSIZE-surf_b_game->w)/2;
 463         dest.y = (YSIZE-surf_b_game->h)/2-40;
 464         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 465
 466         dest.x = (XSIZE-surf_b_over->w)/2;
 467         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 468         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 469
 470         if(new_high_score(score)) {
 471                 text0 = "New High Score!";
 472                 text1 = "Press SPACE to continue";
 473         } else {
 474                 text0 = msgs[g_easy][0];
 475                 text1 = msgs[g_easy][1];
 476         }
 477
 478         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 479         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 480
 481         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 482         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 483 }
 484
 485 void
 486 draw_title_page(void)
 487 {
 488         int x;
 489         char *text;
 490         SDL_Rect dest;
 491
 492         fadetimer += t_frame/2.0;
 493
 494         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 495         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 496         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 497
 498         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 499         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 500         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 501
 502         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 503         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 504         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 505
 506         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 507         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 508         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 509
 510         text = "Version " VERSION;
 511         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 512         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 513 }
 514
 515 void
 516 draw(void)
 517 {
 518         SDL_FillRect(surf_screen,NULL,0);  // black background
 519         draw_dots(surf_screen);            // background dots
 520         draw_sprite(SPRITE(&ship));
 521         draw_rocks();
 522
 523         show_lives();
 524         show_score();
 525
 526         switch (state) {
 527                 case GAME_OVER: draw_game_over(); break;
 528
 529                 case TITLE_PAGE: draw_title_page(); break;
 530
 531                 case HIGH_SCORE_ENTRY: play_tune(TUNE_HIGH_SCORE_ENTRY);
 532                         // and fall through to
 533                 case HIGH_SCORE_DISPLAY:
 534                         // Display de list o high scores mon.
 535                         display_scores(surf_screen, 150,50);
 536                         break;
 537                 case GAMEPLAY:
 538                 case DEAD_PAUSE:
 539                         ; // no action necessary
 540         }
 541
 542         // Update the surface
 543         SDL_Flip(surf_screen);
 544 }
 545
 546 static inline void
 547 kill_ship(struct ship *ship)
 548 {
 549         play_sound(SOUND_BANG);
 550         new_bang_dots(SPRITE(ship));
 551         if(--ship->lives) {
 552                 state = DEAD_PAUSE;
 553                 state_timeout = DEAD_PAUSE_LENGTH;
 554                 // want ship to be invisible, but keep drifting at sqrt(speed)
 555                 // to leave it in the middle of the space from the explosion.
 556                 ship->flags = MOVE;
 557                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 558                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 559                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 560         } else {
 561                 state = GAME_OVER;
 562                 state_timeout = 200.0;
 563                 fadetimer = 0.0;
 564                 ship->flags = 0;
 565                 // scrolling is based on the ship speed, so we need to reset it.
 566                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 567         }
 568 }
 569
 570 void
 571 do_collision(Sprite *a, Sprite *b)
 572 {
 573         if(a->type == SHIP) kill_ship((struct ship *)a);
 574         else if(b->type == SHIP) kill_ship((struct ship *)b);
 575         else bounce(a, b);
 576 }
 577
 578 void
 579 init_score_entry(void)
 580 {
 581         SDL_Event e;
 582         state = HIGH_SCORE_ENTRY;
 583         state_timeout = 5.0e6;
 584         SDL_EnableUNICODE(1);
 585         while(SDL_PollEvent(&e))
 586                 ;
 587         insert_score(score);
 588 }
 589
 590 // Count down the state timer, and change state when it gets to zero or less;
 591 void
 592 update_state(float ticks)
 593 {
 594         state_timeout -= ticks*3;
 595         if(state_timeout > 0) return;
 596
 597         switch(state) {
 598                 case GAMEPLAY: break;  // no action necessary
 599                 case DEAD_PAUSE:
 600                         // Restore the ship and continue playing
 601                         ship.flags = DRAW|MOVE|COLLIDE;
 602                         state = GAMEPLAY;
 603                         play_tune(TUNE_GAMEPLAY);
 604                         break;
 605                 case GAME_OVER:
 606                         if(new_high_score(score)) init_score_entry();
 607                         else {
 608                                 state = HIGH_SCORE_DISPLAY;
 609                                 state_timeout = 400;
 610                         }
 611                         break;
 612                 case HIGH_SCORE_DISPLAY:
 613                         state = TITLE_PAGE;
 614                         state_timeout = 600.0;
 615                         fadetimer = 0.0;
 616                         break;
 617                 case HIGH_SCORE_ENTRY:
 618                         break;
 619                 case TITLE_PAGE:
 620                         state = HIGH_SCORE_DISPLAY;
 621                         state_timeout = 200.0;
 622                         break;
 623         }
 624 }
 625
 626 void
 627 gameloop() {
 628         SDL_Event e;
 629         Uint8 *keystate;
 630         float tmp;
 631
 632         for(;;) {
 633                 ms_frame = SDL_GetTicks() - ms_end;
 634                 ms_end += ms_frame;
 635                 if(ms_frame > 1000) {
 636                         ms_frame = 1000;
 637                 }
 638                 t_frame = gamespeed * ms_frame / 50;
 639                 frames++;
 640
 641                 while(SDL_PollEvent(&e)) {
 642                         switch(e.type) {
 643                                 case SDL_QUIT: return;
 644                                 case SDL_KEYDOWN:
 645                                         if(state == HIGH_SCORE_ENTRY) {
 646                                                 if(!process_score_input(&e.key.keysym)) {
 647                                                         // Write the high score table to the file
 648                                                         write_high_score_table();
 649                                                         // continue to display the scores briefly
 650                                                         state = HIGH_SCORE_DISPLAY;
 651                                                         state_timeout = 200;
 652                                                         play_tune(TUNE_TITLE_PAGE);
 653                                                 }
 654                                         } else if(e.key.keysym.sym == SDLK_q) {
 655                                                 return;
 656                                         }
 657
 658                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 659                                                 return;
 660                                         }
 661                                         break;
 662                         }
 663                 }
 664                 keystate = SDL_GetKeyState(NULL);
 665
 666                 if(state == GAMEPLAY) {
 667                         if(!paused) {
 668                                 score += ms_frame;
 669
 670                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_h]) { ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;}
 671                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_t]) { ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;}
 672                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_n]) { ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;}
 673                                 if(keystate[SDLK_UP]    || keystate[SDLK_c]) { ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;}
 674                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 675                         }
 676
 677                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 678                                 if(!pausedown) {
 679                                         paused = !paused;
 680                                         pausedown = 1;
 681                                         if(!paused) ms_end = SDL_GetTicks();
 682                                 }
 683                         } else {
 684                                 pausedown = 0;
 685                         }
 686                 }
 687
 688                 if(!paused) {
 689                         update_state(t_frame);
 690
 691                         // SCROLLING
 692                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 693                         screendy += tmp * t_frame/12;
 694                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 695                         screendx += tmp * t_frame/12;
 696                         // taper off so we don't hit the barrier abruptly.
 697                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 698                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 699                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 700                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 701                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 702
 703                         move_sprites(t_frame);
 704                         move_dots(t_frame);
 705                         move_dust(t_frame);
 706
 707                         new_rocks(t_frame);
 708                         new_engine_dots(t_frame);
 709
 710                         collisions();
 711
 712                         // BOUNCE off left or right edge of screen
 713                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 714                                 ship.x -= (ship.dx-screendx)*t_frame;
 715                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 716                         }
 717
 718                         // BOUNCE off top or bottom of screen
 719                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 720                                 ship.y -= (ship.dy-screendy)*t_frame;
 721                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 722                         }
 723
 724                         draw();
 725
 726                         // new game
 727                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 728                            && (state == HIGH_SCORE_DISPLAY
 729                                || state == TITLE_PAGE
 730                                || state == GAME_OVER)) {
 731                                 if(state == GAME_OVER && new_high_score(score))
 732                                         init_score_entry();
 733                                 else {
 734                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 735                                                 g_easy = 0;
 736                                                 initial_rocks = NORMAL_I_ROCKS;
 737                                                 final_rocks = NORMAL_F_ROCKS;
 738                                                 if(gamespeed == EASY_GAMESPEED)
 739                                                         gamespeed = NORMAL_GAMESPEED;
 740                                         } else if(keystate[SDLK_1]) {
 741                                                 g_easy = 1;
 742                                                 initial_rocks = EASY_I_ROCKS;
 743                                                 final_rocks = EASY_F_ROCKS;
 744                                                 gamespeed = EASY_GAMESPEED;
 745                                         }
 746                                         reset_sprites();
 747                                         reset_rocks();
 748                                         screendx = BARRIER_SPEED; screendy = 0;
 749
 750                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 751                                         ship.dx = screendx; ship.dy = screendy;
 752                                         ship.lives = 4;
 753                                         ship.flags = MOVE|DRAW|COLLIDE;
 754                                         add_sprite(SPRITE(&ship));
 755
 756                                         score = 0;
 757
 758                                         state = GAMEPLAY;
 759                                         play_tune(TUNE_GAMEPLAY);
 760                                 }
 761                         }
 762
 763                         ship.jets = 0;
 764                 }
 765
 766                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 767                         state = HIGH_SCORE_DISPLAY;
 768                         state_timeout = 400;
 769                 }
 770         }
 771 }
 772
 773 int
 774 main(int argc, char **argv) {
 775         if(!parse_opts(argc, argv)) return 1;
 776
 777         if(init()) {
 778                 printf ("vor: SDL error: '%s'\n",initerror);
 779                 return 1;
 780         }
 781
 782         start = SDL_GetTicks();
 783         frames = 0;
 784         gameloop();
 785         end = SDL_GetTicks();
 786         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 787
 788         return 0;
 789 }