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 void draw(void);
  72
  73 struct dot edot[MAXENGINEDOTS], *dotptr = edot;
  74 struct dot bdot[MAXBANGDOTS];
  75
  76 // Other global variables
  77 char topline[1024];
  78 char *initerror = "";
  79 int screenshot_number = 0;
  80
  81 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  82
  83 float screendx = BARRIER_SPEED, screendy = 0.0;
  84 float dist_ahead;
  85
  86 // all movement is based on t_frame.
  87 unsigned long frames, start, end;
  88 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  89 int ms_frame;   // length of this frame (milliseconds)
  90 int ms_end;     // end of this frame (milliseconds)
  91
  92 float gamespeed = 1.00;
  93
  94 int score;
  95
  96 float fadetimer = 0;
  97
  98 int paused = 0;
  99
 100 // bangdot start (bd1) and end (bd2) position:
 101 int bd1 = 0, bd2 = 0;
 102
 103 enum states {
 104         TITLE_PAGE,
 105         GAMEPLAY,
 106         DEAD_PAUSE,
 107         GAME_OVER,
 108         HIGH_SCORE_ENTRY,
 109         HIGH_SCORE_DISPLAY
 110 };
 111 enum states state = TITLE_PAGE;
 112 float state_timeout = 600.0;
 113
 114 #define NSEQUENCE 3
 115 char *msgs[2][3] = {
 116         {
 117                 "Press SPACE for normal game",
 118                 "Press '1' for easy game",
 119                 "http://jasonwoof.org/vor"
 120         },
 121         {
 122                 "Press SPACE for easy game",
 123                 "Press '2' for normal game",
 124                 "http://jasonwoof.org/vor"
 125         }
 126 };
 127
 128 int bangdotlife, nbangdots;
 129 Uint16 heatcolor[W*3];
 130
 131 char *data_dir;
 132 extern char *optarg;
 133 extern int optind, opterr, optopt;
 134
 135 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 136
 137 // ************************************* FUNCS
 138
 139 void
 140 init_engine_dots() {
 141         int i;
 142         for(i = 0; i<MAXENGINEDOTS; i++) {
 143                 edot[i].active = 0;
 144         }
 145 }
 146
 147
 148 void
 149 new_engine_dots(void) {
 150         int dir, i;
 151         int n = t_frame * ENGINE_DOTS_PER_TIC;
 152         float a, r;  // angle, random length
 153         float dx, dy;
 154         float hx, hy; // half ship width/height.
 155         static const int s[4] = { 2, 1, 0, 1 };
 156         float time;
 157         float accelh, accelv, past_ship_dx, past_ship_dy;
 158
 159         hx = ship.image->w / 2;
 160         hy = ship.image->h / 2;
 161
 162         for(dir=0; dir<4; dir++) {
 163                 if(!(ship.jets & 1<<dir)) continue;
 164
 165                 for(i = 0; i<n; i++) {
 166                         if(dotptr->active == 0) {
 167                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 168                                 r = sin(frnd()*M_PI);
 169                                 dx = r * cos(a);
 170                                 dy = r * -sin(a);  // screen y is "backwards".
 171
 172                                 dotptr->decay = 3;
 173                                 dotptr->heat = 6;
 174
 175                                 // dot was created at a random time during the time span
 176                                 time = frnd() * t_frame; // this is how long ago
 177
 178                                 // calculate how fast the ship was going when this engine dot was
 179                                 // created (as if it had a smooth acceleration). This is used in
 180                                 // determining the velocity of the dots, but not their starting
 181                                 // location.
 182                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 183                                 accelh *= THRUSTER_STRENGTH * time;
 184                                 past_ship_dx = ship.dx - accelh;
 185                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 186                                 accelv *= THRUSTER_STRENGTH * time;
 187                                 past_ship_dy = ship.dy - accelv;
 188
 189                                 // the starting position (not speed) of the dot is calculated as
 190                                 // though the ship were traveling at a constant speed for this
 191                                 // t_frame.
 192                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 193                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 194                                 if(dir&1) {
 195                                         dotptr->dx = past_ship_dx + 2*dx;
 196                                         dotptr->dy = past_ship_dy + 20*dy;
 197                                         dotptr->mass = 60 * fabs(dy);
 198                                 } else {
 199                                         dotptr->dx = past_ship_dx + 20*dx;
 200                                         dotptr->dy = past_ship_dy + 2*dy;
 201                                         dotptr->mass = 60 * fabs(dx);
 202                                 }
 203
 204                                 // move the dot as though it were created in the past
 205                                 dotptr->x += (dotptr->dx - screendx) * time;
 206                                 dotptr->y += (dotptr->dy - screendy) * time;
 207
 208                                 if(!fclip(dotptr->x, XSIZE) && !fclip(dotptr->y, YSIZE)) {
 209                                         dotptr->active = 1;
 210                                         if(dotptr - edot < MAXENGINEDOTS-1) {
 211                                                 dotptr++;
 212                                         } else {
 213                                                 dotptr = edot;
 214                                         }
 215                                 }
 216                         }
 217                 }
 218         }
 219 }
 220
 221
 222 void
 223 new_bang_dots(struct sprite *s)
 224 {
 225         int i, n, x, y;
 226         uint16_t *pixel, c;
 227         uint32_t colorkey;
 228         int row_inc;
 229         double theta, r;
 230         SDL_Surface *img = s->image;
 231
 232         n = 20;
 233         pixel = img->pixels;
 234         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 235         colorkey = img->format->colorkey;
 236
 237         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 238
 239         for(i=0; i<n; i++) {
 240                 pixel = img->pixels;
 241                 for(y=0; y<img->h; y++) {
 242                         for(x = 0; x<img->w; x++) {
 243                                 c = *pixel++;
 244                                 if(c && c != colorkey) {
 245                                         theta = frnd()*M_PI*2;
 246                                         r = frnd(); r = 1 - r*r;
 247
 248                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 249                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 250                                         bdot[bd2].x = x + s->x;
 251                                         bdot[bd2].y = y + s->y;
 252                                         bdot[bd2].mass = frnd() * 99;
 253                                         bdot[bd2].decay = frnd()*1.5 + 0.5;
 254                                         bdot[bd2].heat = 3;
 255                                         bdot[bd2].active = 1;
 256
 257                                         bd2 = (bd2+1) % MAXBANGDOTS;
 258                                 }
 259                                 pixel += row_inc;
 260                         }
 261                 }
 262         }
 263
 264         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 265 }
 266
 267
 268 void
 269 move_dot(struct dot *d)
 270 {
 271         Sprite *hit;
 272         float mass;
 273
 274         if(d->active) {
 275                 d->x += (d->dx - screendx) * t_frame;
 276                 d->y += (d->dy - screendy) * t_frame;
 277                 d->mass -= t_frame * d->decay;
 278                 if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
 279                         d->active = 0;
 280                 else {
 281                         hit = pixel_collides(d->x, d->y);
 282                         if(hit) if(hit->type != SHIP) {
 283                                 d->active = 0;
 284                                 mass = sprite_mass(hit);
 285                                 hit->dx += DOT_MASS_UNIT * d->mass * (d->dx - hit->dx) / mass;
 286                                 hit->dy += DOT_MASS_UNIT * d->mass * (d->dy - hit->dy) / mass;
 287                         }
 288                 }
 289         }
 290 }
 291
 292 void
 293 move_dots(void)
 294 {
 295         int i;
 296
 297         for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i]);
 298         for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i]);
 299 }
 300
 301
 302 void
 303 draw_dot(struct dot *d)
 304 {
 305         uint16_t *pixels, *pixel;
 306         int row_inc;
 307
 308         if(d->active) {
 309                 pixels = (uint16_t *) surf_screen->pixels;
 310                 row_inc = surf_screen->pitch / sizeof(uint16_t);
 311                 pixel = pixels + (int)d->y * row_inc + (int)d->x;
 312                 *pixel = heatcolor[min(3*W-1, (int)(d->mass * d->heat))];
 313         }
 314 }
 315
 316 void
 317 draw_dots(void) {
 318         int i;
 319
 320         if(SDL_MUSTLOCK(surf_screen)) { SDL_LockSurface(surf_screen); }
 321         draw_dust();
 322         for(i=0; i<MAXBANGDOTS; i++) draw_dot(&bdot[i]);
 323         for(i=0; i<MAXENGINEDOTS; i++) draw_dot(&edot[i]);
 324         if(SDL_MUSTLOCK(surf_screen)) { SDL_UnlockSurface(surf_screen); }
 325 }
 326
 327 SDL_Surface *
 328 load_image(char *filename)
 329 {
 330         SDL_Surface *tmp, *img = NULL;
 331         char *s = add_data_path(filename);
 332         if(s) {
 333                 tmp = IMG_Load(s);
 334                 free(s);
 335                 if(tmp) {
 336                         img = SDL_DisplayFormat(tmp);
 337                         SDL_FreeSurface(tmp);
 338                 }
 339         }
 340         return img;
 341 }
 342
 343 void
 344 load_ship(void)
 345 {
 346         load_sprite(SPRITE(&ship), "ship.png");
 347 }
 348
 349 void font_cleanup() {
 350         font_free(g_font);
 351 }
 352
 353 void
 354 set_video_mode() {
 355         Uint32 flag;
 356
 357         // Attempt to get the required video size
 358         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 359         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 360         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 361 }
 362
 363 void
 364 toggle_fullscreen() {
 365         opt_fullscreen = 1 - opt_fullscreen;
 366         set_video_mode();
 367         if(paused) {
 368                 draw();
 369         }
 370 }
 371
 372
 373 int
 374 init(void) {
 375
 376         int i;
 377         char *s;
 378
 379         // Where are our data files?
 380         if(!find_files()) exit(1);
 381         read_high_score_table();
 382
 383         if(opt_sound) {
 384                 // Initialize SDL with audio and video
 385                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 386                         opt_sound = 0;
 387                         fputs("Can't open sound, starting without it\n", stderr);
 388                         atexit(SDL_Quit);
 389                 } else {
 390                         atexit(SDL_Quit);
 391                         atexit(SDL_CloseAudio);
 392                         opt_sound = init_sound();
 393                 }
 394         } else {
 395                 // Initialize with video only
 396                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 397                 atexit(SDL_Quit);
 398         }
 399
 400         play_tune(TUNE_TITLE_PAGE);
 401
 402
 403         // Attempt to get the required video size
 404         set_video_mode();
 405
 406         // Set the title bar text
 407         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 408
 409         NULLERROR(surf_screen);
 410
 411         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 412         for(i = 0; i<W*3; i++) {
 413                 heatcolor[i] = SDL_MapRGB(
 414                         surf_screen->format,
 415                         (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?
 416                 );
 417         }
 418
 419         // Load the banners
 420         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 421         NULLERROR(surf_b_on = load_image("b_on.png"));
 422         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 423
 424         NULLERROR(surf_b_game = load_image("b_game.png"));
 425         NULLERROR(surf_b_over = load_image("b_over.png"));
 426
 427         // Load the life indicator (small ship) graphic.
 428         NULLERROR(surf_life = load_image("life.png"));
 429
 430         // Load the font image
 431         s = add_data_path("font.png");
 432         if(s) {
 433                 g_font = font_load(s);
 434                 atexit(&font_cleanup);
 435         } else {
 436                 fprintf(stderr, "could create path to font\n");
 437                 exit(1);
 438         }
 439
 440         init_engine_dots();
 441         init_dust();
 442
 443         init_sprites();
 444         add_sprite(SPRITE(&ship));
 445
 446         // Remove the mouse cursor
 447 #ifdef SDL_DISABLE
 448         SDL_ShowCursor(SDL_DISABLE);
 449 #endif
 450
 451         return 0;
 452 }
 453
 454 void
 455 show_lives(void)
 456 {
 457         int i;
 458         SDL_Rect dest;
 459
 460         for(i=0; i<ship.lives-1; i++) {
 461                 dest.x = (i + 1)*(surf_life->w + 10);
 462                 dest.y = 20;
 463                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 464         }
 465 }
 466
 467 void
 468 draw_game_over(void)
 469 {
 470         int x;
 471         char *text0, *text1;
 472         SDL_Rect dest;
 473
 474         fadetimer += t_frame;
 475
 476         dest.x = (XSIZE-surf_b_game->w)/2;
 477         dest.y = (YSIZE-surf_b_game->h)/2-40;
 478         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 479
 480         dest.x = (XSIZE-surf_b_over->w)/2;
 481         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 482         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 483
 484         if(new_high_score(score)) {
 485                 text0 = "New High Score!";
 486                 text1 = "Press SPACE to continue";
 487         } else {
 488                 text0 = msgs[g_easy][0];
 489                 text1 = msgs[g_easy][1];
 490         }
 491
 492         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 493         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 494
 495         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 496         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 497 }
 498
 499 void
 500 draw_title_page(void)
 501 {
 502         int x;
 503         char *text;
 504         SDL_Rect dest;
 505
 506         fadetimer += t_frame/2.0;
 507
 508         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 509         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 510         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 511
 512         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 513         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 514         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 515
 516         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 517         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 518         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 519
 520         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 521         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 522         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 523
 524         text = "Version " VERSION;
 525         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 526         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 527 }
 528
 529 void
 530 draw(void)
 531 {
 532         SDL_FillRect(surf_screen,NULL,0);  // black background
 533         draw_dots();            // background dots
 534         draw_sprite(SPRITE(&ship));
 535         draw_rocks();
 536
 537         show_lives();
 538         show_score();
 539
 540         switch (state) {
 541                 case GAME_OVER:
 542                         draw_game_over();
 543                         break;
 544
 545                 case TITLE_PAGE:
 546                         draw_title_page();
 547                         break;
 548
 549                 case HIGH_SCORE_ENTRY:
 550                 case HIGH_SCORE_DISPLAY:
 551                         display_scores(150,50);
 552                         break;
 553
 554                 case GAMEPLAY:
 555                 case DEAD_PAUSE:
 556                         ; // no action necessary
 557         }
 558
 559         // Update the surface
 560         SDL_Flip(surf_screen);
 561 }
 562
 563 static inline void
 564 kill_ship(struct ship *ship)
 565 {
 566         play_sound(SOUND_BANG);
 567         new_bang_dots(SPRITE(ship));
 568         if(--ship->lives) {
 569                 state = DEAD_PAUSE;
 570                 state_timeout = DEAD_PAUSE_LENGTH;
 571                 // want ship to be invisible, but keep drifting at sqrt(speed)
 572                 // to leave it in the middle of the space from the explosion.
 573                 ship->flags = MOVE;
 574                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 575                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 576                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 577         } else {
 578                 state = GAME_OVER;
 579                 play_tune(TUNE_TITLE_PAGE);
 580                 state_timeout = 200.0;
 581                 fadetimer = 0.0;
 582                 ship->flags = 0;
 583                 // scrolling is based on the ship speed, so we need to reset it.
 584                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 585         }
 586 }
 587
 588 void
 589 do_collision(Sprite *a, Sprite *b)
 590 {
 591         if(a->type == SHIP) kill_ship((struct ship *)a);
 592         else if(b->type == SHIP) kill_ship((struct ship *)b);
 593         else bounce(a, b);
 594 }
 595
 596 void
 597 init_score_entry(void)
 598 {
 599         SDL_Event e;
 600         state = HIGH_SCORE_ENTRY;
 601         state_timeout = 5.0e6;
 602         SDL_EnableUNICODE(1);
 603         while(SDL_PollEvent(&e))
 604                 ;
 605         insert_score(score);
 606 }
 607
 608 // Count down the state timer, and change state when it gets to zero or less;
 609 void
 610 update_state(void)
 611 {
 612         state_timeout -= t_frame*3;
 613         if(state_timeout > 0) return;
 614
 615         switch(state) {
 616                 case GAMEPLAY: break;  // no action necessary
 617                 case DEAD_PAUSE:
 618                         // Restore the ship and continue playing
 619                         ship.flags = DRAW|MOVE|COLLIDE;
 620                         state = GAMEPLAY;
 621                         break;
 622                 case GAME_OVER:
 623                         if(new_high_score(score)) init_score_entry();
 624                         else {
 625                                 state = HIGH_SCORE_DISPLAY;
 626                                 state_timeout = 400;
 627                         }
 628                         break;
 629                 case HIGH_SCORE_DISPLAY:
 630                         state = TITLE_PAGE;
 631                         state_timeout = 600.0;
 632                         fadetimer = 0.0;
 633                         break;
 634                 case HIGH_SCORE_ENTRY:
 635                         break;
 636                 case TITLE_PAGE:
 637                         state = HIGH_SCORE_DISPLAY;
 638                         state_timeout = 200.0;
 639                         break;
 640         }
 641 }
 642
 643 void
 644 gameloop() {
 645         SDL_Event e;
 646         Uint8 *keystate;
 647         float tmp;
 648
 649         for(;;) {
 650                 ms_frame = SDL_GetTicks() - ms_end;
 651                 ms_end += ms_frame;
 652                 if(ms_frame > 50) {
 653                         ms_frame = 50;
 654                 }
 655                 t_frame = gamespeed * ms_frame / 50;
 656                 frames++;
 657
 658                 if(opt_autopilot) {
 659                         autopilot(t_frame);
 660                 }
 661
 662                 while(paused ? SDL_WaitEvent(&e) : SDL_PollEvent(&e)) {
 663                         switch(e.type) {
 664                                 case SDL_QUIT: return;
 665                                 case SDL_KEYDOWN:
 666                                         // even during high-score entry
 667                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 668                                                 return;
 669                                         }
 670
 671                                         if(state == HIGH_SCORE_ENTRY) {
 672                                                 if(!process_score_input(&e.key.keysym)) {
 673                                                         // Write the high score table to the file
 674                                                         write_high_score_table();
 675                                                         // continue to display the scores briefly
 676                                                         state = HIGH_SCORE_DISPLAY;
 677                                                         state_timeout = 200;
 678                                                 }
 679                                         } else {
 680                                                 switch(e.key.keysym.sym) {
 681                                                         case SDLK_q:
 682                                                                 return;
 683                                                         case SDLK_3:
 684                                                         case SDLK_PRINT:
 685                                                                 {
 686                                                                         FILE *screenshot_fp;
 687                                                                         char tmp[30];
 688                                                                         char *screenshot_filename = &(tmp[0]);
 689                                                                         for(;;) {
 690                                                                                 snprintf(screenshot_filename, 30, "vor-screenshot-%02i.bmp", screenshot_number++);
 691                                                                                 screenshot_fp = fopen(screenshot_filename, "r");
 692                                                                                 if(screenshot_fp) {
 693                                                                                         fclose(screenshot_fp);
 694                                                                                 } else {
 695                                                                                         break;
 696                                                                                 }
 697                                                                         }
 698                                                                         SDL_SaveBMP(surf_screen, screenshot_filename);
 699                                                                 }
 700                                                                 break;
 701                                                         case SDLK_p:
 702                                                         case SDLK_PAUSE:
 703                                                                 paused = !paused;
 704                                                                 if(paused) {
 705                                                                         pause_tune();
 706                                                                 } else {
 707                                                                         resume_tune();
 708                                                                         ms_end = SDL_GetTicks();
 709                                                                 }
 710                                                                 break;
 711                                                         case SDLK_f:
 712                                                         case SDLK_F11:
 713                                                                 toggle_fullscreen();
 714                                                                 break;
 715                                                         default:
 716                                                                 // other keys are handled by checking keystate each frame
 717                                                                 break;
 718                                                 }
 719                                         }
 720                                         break;
 721                         }
 722                 }
 723                 keystate = SDL_GetKeyState(NULL);
 724                 if(opt_autopilot) {
 725                         autopilot_fix_keystates(keystate);
 726                 }
 727
 728                 if(state == GAMEPLAY) {
 729                         if(!paused) {
 730                                 score += ms_frame;
 731
 732                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_KP4]) {
 733                                         ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;
 734                                 }
 735                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_KP5] || keystate[SDLK_KP2]) {
 736                                         ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;
 737                                 }
 738                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_KP6]) {
 739                                         ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;
 740                                 }
 741                                 if(keystate[SDLK_UP]    || keystate[SDLK_KP8]) {
 742                                         ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;
 743                                 }
 744                                 if(ship.jets) {
 745                                         ship.dx = fconstrain2(ship.dx, -50, 50);
 746                                         ship.dy = fconstrain2(ship.dy, -50, 50);
 747                                 }
 748                         }
 749
 750                 }
 751
 752                 if(!paused) {
 753                         update_state();
 754
 755                         // SCROLLING
 756                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 757                         screendy += tmp * t_frame/12;
 758                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 759                         screendx += tmp * t_frame/12;
 760                         // taper off so we don't hit the barrier abruptly.
 761                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 762                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 763                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 764                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 765                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 766
 767                         move_sprites();
 768                         move_dots();
 769                         move_dust();
 770
 771                         new_rocks();
 772
 773                         // BOUNCE off left or right edge of screen
 774                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 775                                 ship.x -= (ship.dx-screendx)*t_frame;
 776                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 777                                 ship.x = fconstrain(ship.x, XSIZE - ship.w);
 778                         }
 779
 780                         // BOUNCE off top or bottom of screen
 781                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 782                                 ship.y -= (ship.dy-screendy)*t_frame;
 783                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 784                                 ship.y = fconstrain(ship.y, YSIZE - ship.h);
 785                         }
 786
 787                         new_engine_dots();
 788
 789                         collisions(); // must happen after ship bouncing because it puts pixels where the ship is (thus the ship must be on the screen)
 790
 791
 792                         draw();
 793
 794                         // new game
 795                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 796                            && (state == HIGH_SCORE_DISPLAY
 797                                || state == TITLE_PAGE
 798                                || state == GAME_OVER)) {
 799                                 if(state == GAME_OVER && new_high_score(score))
 800                                         init_score_entry();
 801                                 else {
 802                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 803                                                 g_easy = 0;
 804                                                 initial_rocks = NORMAL_I_ROCKS;
 805                                                 final_rocks = NORMAL_F_ROCKS;
 806                                                 if(gamespeed == EASY_GAMESPEED)
 807                                                         gamespeed = NORMAL_GAMESPEED;
 808                                         } else if(keystate[SDLK_1]) {
 809                                                 g_easy = 1;
 810                                                 initial_rocks = EASY_I_ROCKS;
 811                                                 final_rocks = EASY_F_ROCKS;
 812                                                 gamespeed = EASY_GAMESPEED;
 813                                         }
 814                                         reset_sprites();
 815                                         reset_rocks();
 816                                         screendx = BARRIER_SPEED; screendy = 0;
 817
 818                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 819                                         ship.dx = screendx; ship.dy = screendy;
 820                                         ship.lives = 4;
 821                                         ship.flags = MOVE|DRAW|COLLIDE;
 822                                         add_sprite(SPRITE(&ship));
 823
 824                                         score = 0;
 825
 826                                         state = GAMEPLAY;
 827                                         play_tune(TUNE_GAMEPLAY);
 828                                 }
 829                         }
 830
 831                         ship.jets = 0;
 832                 }
 833
 834                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 835                         state = HIGH_SCORE_DISPLAY;
 836                         state_timeout = 400;
 837                 }
 838         }
 839 }
 840
 841 int
 842 main(int argc, char **argv) {
 843         if(!parse_opts(argc, argv)) return 1;
 844
 845         if(init()) {
 846                 printf ("vor: SDL error: '%s'\n",initerror);
 847                 return 1;
 848         }
 849
 850         start = SDL_GetTicks();
 851         frames = 0;
 852         gameloop();
 853         end = SDL_GetTicks();
 854         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 855
 856         return 0;
 857 }