main.c

   1 /* Variations on RockDodger
   2  * Space Rocks copyright (C) 2001 Paul Holt <pad@pcholt.com>
   3  *
   4  * Project fork 2004, Jason Woofenden and Joshua Grams.
   5  * (a whole bunch of modifications and project rename)
   6
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <math.h>
  23 #include <SDL.h>
  24 #include <SDL_image.h>
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "font.h"
  31
  32 #include "args.h"
  33 #include "common.h"
  34 #include "config.h"
  35 #include "dust.h"
  36 #include "file.h"
  37 #include "float.h"
  38 #include "globals.h"
  39 #include "mt.h"
  40 #include "rocks.h"
  41 #include "score.h"
  42 #include "sprite.h"
  43 #include "sound.h"
  44 #include "autopilot.h"
  45
  46 // ************************************* VARS
  47 // SDL_Surface global variables
  48 SDL_Surface
  49         *surf_screen,   // Screen
  50         *surf_b_variations, // "variations" banner
  51         *surf_b_on, // "on" banner
  52         *surf_b_rockdodger, // "rockdodger" banner
  53         *surf_b_game,   // Title element "game"
  54         *surf_b_over,   // Title element "over"
  55         *surf_life,     // Indicator of number of ships remaining
  56         *surf_rock[NROCKS],     // THE ROCKS
  57         *surf_font_big; // The big font
  58
  59
  60 font *g_font;
  61
  62 struct dot {
  63         int active;
  64         float x, y;
  65         float dx, dy;
  66         float mass;   // in DOT_MASS_UNITs
  67         float decay;  // rate at which to reduce mass.
  68         int heat;     // heat multiplier (color).
  69 };
  70
  71 struct dot edot[MAXENGINEDOTS], *dotptr = edot;
  72 struct dot bdot[MAXBANGDOTS];
  73
  74 // Other global variables
  75 char topline[1024];
  76 char *initerror = "";
  77
  78 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  79
  80 float screendx = BARRIER_SPEED, screendy = 0.0;
  81 float dist_ahead;
  82
  83 // all movement is based on t_frame.
  84 unsigned long frames, start, end;
  85 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  86 int ms_frame;   // length of this frame (milliseconds)
  87 int ms_end;     // end of this frame (milliseconds)
  88
  89 float gamespeed = 1.00;
  90
  91 int score;
  92
  93 float fadetimer = 0;
  94
  95 int paused = 0;
  96
  97 // bangdot start (bd1) and end (bd2) position:
  98 int bd1 = 0, bd2 = 0;
  99
 100 enum states {
 101         TITLE_PAGE,
 102         GAMEPLAY,
 103         DEAD_PAUSE,
 104         GAME_OVER,
 105         HIGH_SCORE_ENTRY,
 106         HIGH_SCORE_DISPLAY
 107 };
 108 enum states state = TITLE_PAGE;
 109 float state_timeout = 600.0;
 110
 111 #define NSEQUENCE 3
 112 char *msgs[2][3] = {
 113         {
 114                 "Press SPACE for normal game",
 115                 "Press '1' for easy game",
 116                 "http://jasonwoof.org/vor"
 117         },
 118         {
 119                 "Press SPACE for easy game",
 120                 "Press '2' for normal game",
 121                 "http://jasonwoof.org/vor"
 122         }
 123 };
 124
 125 int bangdotlife, nbangdots;
 126 Uint16 heatcolor[W*3];
 127
 128 char *data_dir;
 129 extern char *optarg;
 130 extern int optind, opterr, optopt;
 131
 132 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 133
 134 // ************************************* FUNCS
 135
 136 void
 137 init_engine_dots() {
 138         int i;
 139         for(i = 0; i<MAXENGINEDOTS; i++) {
 140                 edot[i].active = 0;
 141         }
 142 }
 143
 144
 145 void
 146 new_engine_dots(void) {
 147         int dir, i;
 148         int n = t_frame * ENGINE_DOTS_PER_TIC;
 149         float a, r;  // angle, random length
 150         float dx, dy;
 151         float hx, hy; // half ship width/height.
 152         static const int s[4] = { 2, 1, 0, 1 };
 153         float time;
 154         float accelh, accelv, past_ship_dx, past_ship_dy;
 155
 156         hx = ship.image->w / 2;
 157         hy = ship.image->h / 2;
 158
 159         for(dir=0; dir<4; dir++) {
 160                 if(!(ship.jets & 1<<dir)) continue;
 161
 162                 for(i = 0; i<n; i++) {
 163                         if(dotptr->active == 0) {
 164                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 165                                 r = sin(frnd()*M_PI);
 166                                 dx = r * cos(a);
 167                                 dy = r * -sin(a);  // screen y is "backwards".
 168
 169                                 dotptr->decay = 3;
 170                                 dotptr->heat = 6;
 171
 172                                 // dot was created at a random time during the time span
 173                                 time = frnd() * t_frame; // this is how long ago
 174
 175                                 // calculate how fast the ship was going when this engine dot was
 176                                 // created (as if it had a smooth acceleration). This is used in
 177                                 // determining the velocity of the dots, but not their starting
 178                                 // location.
 179                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 180                                 accelh *= THRUSTER_STRENGTH * time;
 181                                 past_ship_dx = ship.dx - accelh;
 182                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 183                                 accelv *= THRUSTER_STRENGTH * time;
 184                                 past_ship_dy = ship.dy - accelv;
 185
 186                                 // the starting position (not speed) of the dot is calculated as
 187                                 // though the ship were traveling at a constant speed for this
 188                                 // t_frame.
 189                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 190                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 191                                 if(dir&1) {
 192                                         dotptr->dx = past_ship_dx + 2*dx;
 193                                         dotptr->dy = past_ship_dy + 20*dy;
 194                                         dotptr->mass = 60 * fabs(dy);
 195                                 } else {
 196                                         dotptr->dx = past_ship_dx + 20*dx;
 197                                         dotptr->dy = past_ship_dy + 2*dy;
 198                                         dotptr->mass = 60 * fabs(dx);
 199                                 }
 200
 201                                 // move the dot as though it were created in the past
 202                                 dotptr->x += (dotptr->dx - screendx) * time;
 203                                 dotptr->y += (dotptr->dy - screendy) * time;
 204
 205                                 if(!fclip(dotptr->x, XSIZE) && !fclip(dotptr->y, YSIZE)) {
 206                                         dotptr->active = 1;
 207                                         if(dotptr - edot < MAXENGINEDOTS-1) {
 208                                                 dotptr++;
 209                                         } else {
 210                                                 dotptr = edot;
 211                                         }
 212                                 }
 213                         }
 214                 }
 215         }
 216 }
 217
 218
 219 void
 220 new_bang_dots(struct sprite *s)
 221 {
 222         int i, n, x, y;
 223         uint16_t *pixel, c;
 224         uint32_t colorkey;
 225         int row_inc;
 226         double theta, r;
 227         SDL_Surface *img = s->image;
 228
 229         n = 20;
 230         pixel = img->pixels;
 231         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 232         colorkey = img->format->colorkey;
 233
 234         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 235
 236         for(i=0; i<n; i++) {
 237                 pixel = img->pixels;
 238                 for(y=0; y<img->h; y++) {
 239                         for(x = 0; x<img->w; x++) {
 240                                 c = *pixel++;
 241                                 if(c && c != colorkey) {
 242                                         theta = frnd()*M_PI*2;
 243                                         r = frnd(); r = 1 - r*r;
 244
 245                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 246                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 247                                         bdot[bd2].x = x + s->x;
 248                                         bdot[bd2].y = y + s->y;
 249                                         bdot[bd2].mass = frnd() * 99;
 250                                         bdot[bd2].decay = frnd()*1.5 + 0.5;
 251                                         bdot[bd2].heat = 3;
 252                                         bdot[bd2].active = 1;
 253
 254                                         bd2 = (bd2+1) % MAXBANGDOTS;
 255                                 }
 256                                 pixel += row_inc;
 257                         }
 258                 }
 259         }
 260
 261         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 262 }
 263
 264
 265 void
 266 move_dot(struct dot *d)
 267 {
 268         Sprite *hit;
 269         float mass;
 270
 271         if(d->active) {
 272                 d->x += (d->dx - screendx) * t_frame;
 273                 d->y += (d->dy - screendy) * t_frame;
 274                 d->mass -= t_frame * d->decay;
 275                 if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
 276                         d->active = 0;
 277                 else {
 278                         hit = pixel_collides(d->x, d->y);
 279                         if(hit) if(hit->type != SHIP) {
 280                                 d->active = 0;
 281                                 mass = sprite_mass(hit);
 282                                 hit->dx += DOT_MASS_UNIT * d->mass * (d->dx - hit->dx) / mass;
 283                                 hit->dy += DOT_MASS_UNIT * d->mass * (d->dy - hit->dy) / mass;
 284                         }
 285                 }
 286         }
 287 }
 288
 289 void
 290 move_dots(void)
 291 {
 292         int i;
 293
 294         for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i]);
 295         for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i]);
 296 }
 297
 298
 299 void
 300 draw_dot(struct dot *d)
 301 {
 302         uint16_t *pixels, *pixel;
 303         int row_inc;
 304
 305         if(d->active) {
 306                 pixels = (uint16_t *) surf_screen->pixels;
 307                 row_inc = surf_screen->pitch / sizeof(uint16_t);
 308                 pixel = pixels + (int)d->y * row_inc + (int)d->x;
 309                 *pixel = heatcolor[min(3*W-1, (int)(d->mass * d->heat))];
 310         }
 311 }
 312
 313 void
 314 draw_dots(void) {
 315         int i;
 316
 317         if(SDL_MUSTLOCK(surf_screen)) { SDL_LockSurface(surf_screen); }
 318         draw_dust();
 319         for(i=0; i<MAXBANGDOTS; i++) draw_dot(&bdot[i]);
 320         for(i=0; i<MAXENGINEDOTS; i++) draw_dot(&edot[i]);
 321         if(SDL_MUSTLOCK(surf_screen)) { SDL_UnlockSurface(surf_screen); }
 322 }
 323
 324 SDL_Surface *
 325 load_image(char *filename)
 326 {
 327         SDL_Surface *tmp, *img = NULL;
 328         char *s = add_data_path(filename);
 329         if(s) {
 330                 tmp = IMG_Load(s);
 331                 free(s);
 332                 if(tmp) {
 333                         img = SDL_DisplayFormat(tmp);
 334                         SDL_FreeSurface(tmp);
 335                 }
 336         }
 337         return img;
 338 }
 339
 340 void
 341 load_ship(void)
 342 {
 343         load_sprite(SPRITE(&ship), "ship.png");
 344 }
 345
 346 void font_cleanup() {
 347         font_free(g_font);
 348 }
 349
 350 int
 351 init(void) {
 352
 353         int i;
 354         char *s;
 355         Uint32 flag;
 356
 357         // Where are our data files?
 358         if(!find_files()) exit(1);
 359         read_high_score_table();
 360
 361         if(opt_sound) {
 362                 // Initialize SDL with audio and video
 363                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 364                         opt_sound = 0;
 365                         fputs("Can't open sound, starting without it\n", stderr);
 366                         atexit(SDL_Quit);
 367                 } else {
 368                         atexit(SDL_Quit);
 369                         atexit(SDL_CloseAudio);
 370                         opt_sound = init_sound();
 371                 }
 372         } else {
 373                 // Initialize with video only
 374                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 375                 atexit(SDL_Quit);
 376         }
 377
 378         play_tune(TUNE_TITLE_PAGE);
 379
 380         // Attempt to get the required video size
 381         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 382         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 383         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 384
 385         // Set the title bar text
 386         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 387
 388         NULLERROR(surf_screen);
 389
 390         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 391         for(i = 0; i<W*3; i++) {
 392                 heatcolor[i] = SDL_MapRGB(
 393                         surf_screen->format,
 394                         (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?
 395                 );
 396         }
 397
 398         // Load the banners
 399         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 400         NULLERROR(surf_b_on = load_image("b_on.png"));
 401         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 402
 403         NULLERROR(surf_b_game = load_image("b_game.png"));
 404         NULLERROR(surf_b_over = load_image("b_over.png"));
 405
 406         // Load the life indicator (small ship) graphic.
 407         NULLERROR(surf_life = load_image("life.png"));
 408
 409         // Load the font image
 410         s = add_data_path("font.png");
 411         if(s) {
 412                 g_font = font_load(s);
 413                 atexit(&font_cleanup);
 414         } else {
 415                 fprintf(stderr, "could create path to font\n");
 416                 exit(1);
 417         }
 418
 419         init_engine_dots();
 420         init_dust();
 421
 422         init_sprites();
 423         add_sprite(SPRITE(&ship));
 424
 425         // Remove the mouse cursor
 426 #ifdef SDL_DISABLE
 427         SDL_ShowCursor(SDL_DISABLE);
 428 #endif
 429
 430         return 0;
 431 }
 432
 433 void
 434 show_lives(void)
 435 {
 436         int i;
 437         SDL_Rect dest;
 438
 439         for(i=0; i<ship.lives-1; i++) {
 440                 dest.x = (i + 1)*(surf_life->w + 10);
 441                 dest.y = 20;
 442                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 443         }
 444 }
 445
 446 void
 447 draw_game_over(void)
 448 {
 449         int x;
 450         char *text0, *text1;
 451         SDL_Rect dest;
 452
 453         fadetimer += t_frame;
 454
 455         dest.x = (XSIZE-surf_b_game->w)/2;
 456         dest.y = (YSIZE-surf_b_game->h)/2-40;
 457         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 458
 459         dest.x = (XSIZE-surf_b_over->w)/2;
 460         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 461         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 462
 463         if(new_high_score(score)) {
 464                 text0 = "New High Score!";
 465                 text1 = "Press SPACE to continue";
 466         } else {
 467                 text0 = msgs[g_easy][0];
 468                 text1 = msgs[g_easy][1];
 469         }
 470
 471         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 472         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 473
 474         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 475         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 476 }
 477
 478 void
 479 draw_title_page(void)
 480 {
 481         int x;
 482         char *text;
 483         SDL_Rect dest;
 484
 485         fadetimer += t_frame/2.0;
 486
 487         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 488         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 489         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 490
 491         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 492         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 493         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 494
 495         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 496         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 497         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 498
 499         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 500         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 501         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 502
 503         text = "Version " VERSION;
 504         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 505         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 506 }
 507
 508 void
 509 draw(void)
 510 {
 511         SDL_FillRect(surf_screen,NULL,0);  // black background
 512         draw_dots();            // background dots
 513         draw_sprite(SPRITE(&ship));
 514         draw_rocks();
 515
 516         show_lives();
 517         show_score();
 518
 519         switch (state) {
 520                 case GAME_OVER: draw_game_over(); break;
 521
 522                 case TITLE_PAGE: draw_title_page(); break;
 523
 524                 case HIGH_SCORE_ENTRY: play_tune(TUNE_HIGH_SCORE_ENTRY);
 525                         // and fall through to
 526                 case HIGH_SCORE_DISPLAY:
 527                         // Display de list o high scores mon.
 528                         display_scores(150,50);
 529                         break;
 530                 case GAMEPLAY:
 531                 case DEAD_PAUSE:
 532                         ; // no action necessary
 533         }
 534
 535         // Update the surface
 536         SDL_Flip(surf_screen);
 537 }
 538
 539 static inline void
 540 kill_ship(struct ship *ship)
 541 {
 542         play_sound(SOUND_BANG);
 543         new_bang_dots(SPRITE(ship));
 544         if(--ship->lives) {
 545                 state = DEAD_PAUSE;
 546                 state_timeout = DEAD_PAUSE_LENGTH;
 547                 // want ship to be invisible, but keep drifting at sqrt(speed)
 548                 // to leave it in the middle of the space from the explosion.
 549                 ship->flags = MOVE;
 550                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 551                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 552                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 553         } else {
 554                 state = GAME_OVER;
 555                 state_timeout = 200.0;
 556                 fadetimer = 0.0;
 557                 ship->flags = 0;
 558                 // scrolling is based on the ship speed, so we need to reset it.
 559                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 560         }
 561 }
 562
 563 void
 564 do_collision(Sprite *a, Sprite *b)
 565 {
 566         if(a->type == SHIP) kill_ship((struct ship *)a);
 567         else if(b->type == SHIP) kill_ship((struct ship *)b);
 568         else bounce(a, b);
 569 }
 570
 571 void
 572 init_score_entry(void)
 573 {
 574         SDL_Event e;
 575         state = HIGH_SCORE_ENTRY;
 576         state_timeout = 5.0e6;
 577         SDL_EnableUNICODE(1);
 578         while(SDL_PollEvent(&e))
 579                 ;
 580         insert_score(score);
 581 }
 582
 583 // Count down the state timer, and change state when it gets to zero or less;
 584 void
 585 update_state(void)
 586 {
 587         state_timeout -= t_frame*3;
 588         if(state_timeout > 0) return;
 589
 590         switch(state) {
 591                 case GAMEPLAY: break;  // no action necessary
 592                 case DEAD_PAUSE:
 593                         // Restore the ship and continue playing
 594                         ship.flags = DRAW|MOVE|COLLIDE;
 595                         state = GAMEPLAY;
 596                         play_tune(TUNE_GAMEPLAY);
 597                         break;
 598                 case GAME_OVER:
 599                         if(new_high_score(score)) init_score_entry();
 600                         else {
 601                                 state = HIGH_SCORE_DISPLAY;
 602                                 state_timeout = 400;
 603                         }
 604                         break;
 605                 case HIGH_SCORE_DISPLAY:
 606                         state = TITLE_PAGE;
 607                         state_timeout = 600.0;
 608                         fadetimer = 0.0;
 609                         break;
 610                 case HIGH_SCORE_ENTRY:
 611                         break;
 612                 case TITLE_PAGE:
 613                         state = HIGH_SCORE_DISPLAY;
 614                         state_timeout = 200.0;
 615                         break;
 616         }
 617 }
 618
 619 void
 620 gameloop() {
 621         SDL_Event e;
 622         Uint8 *keystate;
 623         float tmp;
 624
 625         for(;;) {
 626                 ms_frame = SDL_GetTicks() - ms_end;
 627                 ms_end += ms_frame;
 628                 if(ms_frame > 50) {
 629                         ms_frame = 50;
 630                 }
 631                 t_frame = gamespeed * ms_frame / 50;
 632                 frames++;
 633
 634                 if(opt_autopilot) {
 635                         autopilot(t_frame);
 636                 }
 637
 638                 while(SDL_PollEvent(&e)) {
 639                         switch(e.type) {
 640                                 case SDL_QUIT: return;
 641                                 case SDL_KEYDOWN:
 642                                         // even during high-score entry
 643                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 644                                                 return;
 645                                         }
 646
 647                                         if(state == HIGH_SCORE_ENTRY) {
 648                                                 if(!process_score_input(&e.key.keysym)) {
 649                                                         // Write the high score table to the file
 650                                                         write_high_score_table();
 651                                                         // continue to display the scores briefly
 652                                                         state = HIGH_SCORE_DISPLAY;
 653                                                         state_timeout = 200;
 654                                                         play_tune(TUNE_TITLE_PAGE);
 655                                                 }
 656                                         } else {
 657                                                 switch(e.key.keysym.sym) {
 658                                                         case SDLK_q:
 659                                                                 return;
 660                                                         case SDLK_3:
 661                                                         case SDLK_PRINT:
 662                                                                 // FIXME make a unique filename like vor-screenshot-<pid>-<count>.bmp
 663                                                                 SDL_SaveBMP(surf_screen, "snapshot.bmp");
 664                                                                 break;
 665                                                         case SDLK_p:
 666                                                         case SDLK_PAUSE:
 667                                                                 paused = !paused;
 668                                                                 if(!paused) {
 669                                                                         ms_end = SDL_GetTicks();
 670                                                                 }
 671                                                                 break;
 672                                                         default:
 673                                                                 // other keys are handled by checking keystate each frame
 674                                                                 break;
 675                                                 }
 676                                         }
 677                                         break;
 678                         }
 679                 }
 680                 keystate = SDL_GetKeyState(NULL);
 681                 if(opt_autopilot) {
 682                         autopilot_fix_keystates(keystate);
 683                 }
 684
 685                 if(state == GAMEPLAY) {
 686                         if(!paused) {
 687                                 score += ms_frame;
 688
 689                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_KP4]) {
 690                                         ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;
 691                                 }
 692                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_KP5] || keystate[SDLK_KP2]) {
 693                                         ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;
 694                                 }
 695                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_KP6]) {
 696                                         ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;
 697                                 }
 698                                 if(keystate[SDLK_UP]    || keystate[SDLK_KP8]) {
 699                                         ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;
 700                                 }
 701                                 if(ship.jets) {
 702                                         ship.dx = fconstrain2(ship.dx, -50, 50);
 703                                         ship.dy = fconstrain2(ship.dy, -50, 50);
 704                                 }
 705                         }
 706
 707                 }
 708
 709                 if(!paused) {
 710                         update_state();
 711
 712                         // SCROLLING
 713                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 714                         screendy += tmp * t_frame/12;
 715                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 716                         screendx += tmp * t_frame/12;
 717                         // taper off so we don't hit the barrier abruptly.
 718                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 719                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 720                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 721                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 722                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 723
 724                         move_sprites();
 725                         move_dots();
 726                         move_dust();
 727
 728                         new_rocks();
 729
 730                         // BOUNCE off left or right edge of screen
 731                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 732                                 ship.x -= (ship.dx-screendx)*t_frame;
 733                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 734                                 ship.x = fconstrain(ship.x, XSIZE - ship.w);
 735                         }
 736
 737                         // BOUNCE off top or bottom of screen
 738                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 739                                 ship.y -= (ship.dy-screendy)*t_frame;
 740                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 741                                 ship.y = fconstrain(ship.y, YSIZE - ship.h);
 742                         }
 743
 744                         new_engine_dots();
 745
 746                         collisions(); // must happen after ship bouncing because it puts pixels where the ship is (thus the ship must be on the screen)
 747
 748
 749                         draw();
 750
 751                         // new game
 752                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 753                            && (state == HIGH_SCORE_DISPLAY
 754                                || state == TITLE_PAGE
 755                                || state == GAME_OVER)) {
 756                                 if(state == GAME_OVER && new_high_score(score))
 757                                         init_score_entry();
 758                                 else {
 759                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 760                                                 g_easy = 0;
 761                                                 initial_rocks = NORMAL_I_ROCKS;
 762                                                 final_rocks = NORMAL_F_ROCKS;
 763                                                 if(gamespeed == EASY_GAMESPEED)
 764                                                         gamespeed = NORMAL_GAMESPEED;
 765                                         } else if(keystate[SDLK_1]) {
 766                                                 g_easy = 1;
 767                                                 initial_rocks = EASY_I_ROCKS;
 768                                                 final_rocks = EASY_F_ROCKS;
 769                                                 gamespeed = EASY_GAMESPEED;
 770                                         }
 771                                         reset_sprites();
 772                                         reset_rocks();
 773                                         screendx = BARRIER_SPEED; screendy = 0;
 774
 775                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 776                                         ship.dx = screendx; ship.dy = screendy;
 777                                         ship.lives = 4;
 778                                         ship.flags = MOVE|DRAW|COLLIDE;
 779                                         add_sprite(SPRITE(&ship));
 780
 781                                         score = 0;
 782
 783                                         state = GAMEPLAY;
 784                                         play_tune(TUNE_GAMEPLAY);
 785                                 }
 786                         }
 787
 788                         ship.jets = 0;
 789                 }
 790
 791                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 792                         state = HIGH_SCORE_DISPLAY;
 793                         state_timeout = 400;
 794                 }
 795         }
 796 }
 797
 798 int
 799 main(int argc, char **argv) {
 800         if(!parse_opts(argc, argv)) return 1;
 801
 802         if(init()) {
 803                 printf ("vor: SDL error: '%s'\n",initerror);
 804                 return 1;
 805         }
 806
 807         start = SDL_GetTicks();
 808         frames = 0;
 809         gameloop();
 810         end = SDL_GetTicks();
 811         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 812
 813         return 0;
 814 }