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 #include <time.h>
  30
  31 #include "font.h"
  32
  33 #include "args.h"
  34 #include "common.h"
  35 #include <config.h>
  36 #include "vorconfig.h"
  37 #include "dust.h"
  38 #include "file.h"
  39 #include "float.h"
  40 #include "globals.h"
  41 #include "mt.h"
  42 #include "rocks.h"
  43 #include "score.h"
  44 #include "sprite.h"
  45 #include "sound.h"
  46 #include "autopilot.h"
  47
  48 // ************************************* VARS
  49 // SDL_Surface global variables
  50 SDL_Surface
  51         *surf_screen,   // Screen
  52         *surf_b_variations, // "variations" banner
  53         *surf_b_on, // "on" banner
  54         *surf_b_rockdodger, // "rockdodger" banner
  55         *surf_b_game,   // Title element "game"
  56         *surf_b_over,   // Title element "over"
  57         *surf_life,     // Indicator of number of ships remaining
  58         *surf_rock[NROCKS],     // THE ROCKS
  59         *surf_font_big; // The big font
  60
  61
  62 font *g_font;
  63
  64 #define ENGINEDOT 0
  65 #define BANGDOT 1
  66
  67 struct dot {
  68         int active;
  69         float x, y;
  70         float dx, dy;
  71         float mass;   // in DOT_MASS_UNITs
  72         float decay;  // rate at which to reduce mass.
  73         int heat;     // heat multiplier (color).
  74         uint8_t type;  // BANGDOT or ENGINEDOT
  75 };
  76
  77 void draw(void);
  78
  79 struct dot edot[MAXENGINEDOTS], *dotptr = edot;
  80 struct dot bdot[MAXBANGDOTS];
  81
  82 // Other global variables
  83 char topline[1024];
  84 char *initerror = "";
  85 int screenshot_number = 0;
  86
  87 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  88
  89 float screendx = BARRIER_SPEED, screendy = 0.0;
  90 float dist_ahead;
  91
  92 // all movement is based on t_frame.
  93 unsigned long frames, start, end;
  94 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  95 int ms_frame;   // length of this frame (milliseconds)
  96 int ms_end;     // end of this frame (milliseconds)
  97
  98 float gamespeed = 1.00;
  99
 100 int score;
 101
 102 float fadetimer = 0;
 103
 104 int paused = 0;
 105
 106 // bangdot start (bd1) and end (bd2) position:
 107 int bd1 = 0, bd2 = 0;
 108
 109 enum states {
 110         TITLE_PAGE,
 111         GAMEPLAY,
 112         DEAD_PAUSE,
 113         GAME_OVER,
 114         HIGH_SCORE_ENTRY,
 115         HIGH_SCORE_DISPLAY
 116 };
 117 enum states state = TITLE_PAGE;
 118 float state_timeout = 600.0;
 119
 120 #define NSEQUENCE 3
 121 char *msgs[2][3] = {
 122         {
 123                 "Press SPACE for normal game",
 124                 "Press '1' for easy game",
 125                 "http://jasonwoof.org/vor"
 126         },
 127         {
 128                 "Press SPACE for easy game",
 129                 "Press '2' for normal game",
 130                 "http://jasonwoof.org/vor"
 131         }
 132 };
 133
 134 int bangdotlife, nbangdots;
 135 Uint16 heatcolor[W*3];
 136
 137 char *data_dir;
 138 extern char *optarg;
 139 extern int optind, opterr, optopt;
 140
 141 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 142
 143 // ************************************* FUNCS
 144
 145 #ifdef HAVE_NANOSLEEP
 146 void
 147 tiny_sleep() {
 148         struct timespec t;
 149         t.tv_sec = 0;
 150         t.tv_nsec = 1;
 151         nanosleep(&t, 0);
 152 }
 153 #else
 154 #define tiny_sleep()
 155 #endif
 156
 157 void
 158 init_dots() {
 159         int i;
 160         for(i = 0; i<MAXENGINEDOTS; i++) {
 161                 edot[i].active = 0;
 162                 edot[i].type = ENGINEDOT;
 163         }
 164         for(i = 0; i<MAXBANGDOTS; i++) {
 165                 bdot[i].active = 0;
 166                 bdot[i].type = BANGDOT;
 167         }
 168 }
 169
 170
 171 void
 172 new_engine_dots(void) {
 173         int dir, i;
 174         int n = t_frame * ENGINE_DOTS_PER_TIC;
 175         float a, r;  // angle, random length
 176         float dx, dy;
 177         float hx, hy; // half ship width/height.
 178         static const int s[4] = { 2, 1, 0, 1 };
 179         float time;
 180         float accelh, accelv, past_ship_dx, past_ship_dy;
 181
 182         hx = ship.image->w / 2;
 183         hy = ship.image->h / 2;
 184
 185         for(dir=0; dir<4; dir++) {
 186                 if(!(ship.jets & 1<<dir)) continue;
 187
 188                 for(i = 0; i<n; i++) {
 189                         if(dotptr->active == 0) {
 190                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 191                                 r = sin(frnd()*M_PI);
 192                                 dx = r * cos(a);
 193                                 dy = r * -sin(a);  // screen y is "backwards".
 194
 195                                 dotptr->decay = 3;
 196                                 dotptr->heat = 6;
 197
 198                                 // dot was created at a random time during the time span
 199                                 time = frnd() * t_frame; // this is how long ago
 200
 201                                 // calculate how fast the ship was going when this engine dot was
 202                                 // created (as if it had a smooth acceleration). This is used in
 203                                 // determining the velocity of the dots, but not their starting
 204                                 // location.
 205                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 206                                 accelh *= THRUSTER_STRENGTH * time;
 207                                 past_ship_dx = ship.dx - accelh;
 208                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 209                                 accelv *= THRUSTER_STRENGTH * time;
 210                                 past_ship_dy = ship.dy - accelv;
 211
 212                                 // the starting position (not speed) of the dot is calculated as
 213                                 // though the ship were traveling at a constant speed for this
 214                                 // t_frame.
 215                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 216                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 217                                 if(dir&1) {
 218                                         dotptr->dx = past_ship_dx + 2*dx;
 219                                         dotptr->dy = past_ship_dy + 20*dy;
 220                                         dotptr->mass = 60 * fabs(dy);
 221                                 } else {
 222                                         dotptr->dx = past_ship_dx + 20*dx;
 223                                         dotptr->dy = past_ship_dy + 2*dy;
 224                                         dotptr->mass = 60 * fabs(dx);
 225                                 }
 226
 227                                 // move the dot as though it were created in the past
 228                                 dotptr->x += (dotptr->dx - screendx) * time;
 229                                 dotptr->y += (dotptr->dy - screendy) * time;
 230
 231                                 if(!fclip(dotptr->x, XSIZE) && !fclip(dotptr->y, YSIZE)) {
 232                                         dotptr->active = 1;
 233                                         if(dotptr - edot < MAXENGINEDOTS-1) {
 234                                                 dotptr++;
 235                                         } else {
 236                                                 dotptr = edot;
 237                                         }
 238                                 }
 239                         }
 240                 }
 241         }
 242 }
 243
 244
 245 void
 246 new_bang_dots(struct sprite *s)
 247 {
 248         int i, n, x, y;
 249         uint16_t *pixel, c;
 250         uint32_t colorkey;
 251         int row_inc;
 252         double theta, r;
 253         SDL_Surface *img = s->image;
 254
 255         n = 20;
 256         pixel = img->pixels;
 257         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 258         colorkey = img->format->colorkey;
 259
 260         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 261
 262         for(i=0; i<n; i++) {
 263                 pixel = img->pixels;
 264                 for(y=0; y<img->h; y++) {
 265                         for(x = 0; x<img->w; x++) {
 266                                 c = *pixel++;
 267                                 if(c && c != colorkey) {
 268                                         theta = frnd()*M_PI*2;
 269                                         r = frnd(); r = 1 - r*r;
 270
 271                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 272                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 273                                         bdot[bd2].x = x + s->x;
 274                                         bdot[bd2].y = y + s->y;
 275                                         bdot[bd2].mass = frnd() * 99;
 276                                         bdot[bd2].decay = frnd()*1.5 + 0.5;
 277                                         bdot[bd2].heat = 3;
 278                                         bdot[bd2].active = 1;
 279
 280                                         bd2 = (bd2+1) % MAXBANGDOTS;
 281                                 }
 282                                 pixel += row_inc;
 283                         }
 284                 }
 285         }
 286
 287         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 288 }
 289
 290 void
 291 kill_rock(struct rock *r) {
 292         r->x = -200;
 293 }
 294
 295 void
 296 move_dot(struct dot *d)
 297 {
 298         Sprite *hit;
 299         float mass;
 300
 301         if(d->active) {
 302                 d->x += (d->dx - screendx) * t_frame;
 303                 d->y += (d->dy - screendy) * t_frame;
 304                 d->mass -= t_frame * d->decay;
 305                 if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
 306                         d->active = 0;
 307                 else {
 308                         hit = pixel_collides(d->x, d->y);
 309                         if(hit) if(hit->type != SHIP) {
 310                                 d->active = 0;
 311                                 mass = sprite_mass(hit);
 312                                 if(d->type == BANGDOT) {
 313                                         struct rock *rock = (struct rock*)hit;
 314                                         rock->life -= (d->dx - hit->dx) * (d->dx - hit->dx) + (d->dy - hit->dy) * (d->dy - hit->dy);
 315                                         if(rock->life < 0) {
 316                                                 kill_rock(rock);
 317                                         }
 318                                 }
 319                                 hit->dx += DOT_MASS_UNIT * d->mass * (d->dx - hit->dx) / mass;
 320                                 hit->dy += DOT_MASS_UNIT * d->mass * (d->dy - hit->dy) / mass;
 321                         }
 322                 }
 323         }
 324 }
 325
 326 void
 327 move_dots(void)
 328 {
 329         int i;
 330
 331         for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i]);
 332         for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i]);
 333 }
 334
 335
 336 void
 337 draw_dot(struct dot *d)
 338 {
 339         uint16_t *pixels, *pixel;
 340         int row_inc;
 341
 342         if(d->active) {
 343                 pixels = (uint16_t *) surf_screen->pixels;
 344                 row_inc = surf_screen->pitch / sizeof(uint16_t);
 345                 pixel = pixels + (int)d->y * row_inc + (int)d->x;
 346                 *pixel = heatcolor[min(3*W-1, (int)(d->mass * d->heat))];
 347         }
 348 }
 349
 350 void
 351 draw_dots(void) {
 352         int i;
 353
 354         if(SDL_MUSTLOCK(surf_screen)) { SDL_LockSurface(surf_screen); }
 355         draw_dust();
 356         for(i=0; i<MAXBANGDOTS; i++) draw_dot(&bdot[i]);
 357         for(i=0; i<MAXENGINEDOTS; i++) draw_dot(&edot[i]);
 358         if(SDL_MUSTLOCK(surf_screen)) { SDL_UnlockSurface(surf_screen); }
 359 }
 360
 361 SDL_Surface *
 362 load_image(char *filename)
 363 {
 364         SDL_Surface *tmp, *img = NULL;
 365         char *s = add_data_path(filename);
 366         if(s) {
 367                 tmp = IMG_Load(s);
 368                 free(s);
 369                 if(tmp) {
 370                         img = SDL_DisplayFormat(tmp);
 371                         SDL_FreeSurface(tmp);
 372                 }
 373         }
 374         return img;
 375 }
 376
 377 void
 378 load_ship(void)
 379 {
 380         load_sprite(SPRITE(&ship), "ship.png");
 381 }
 382
 383 void font_cleanup() {
 384         font_free(g_font);
 385 }
 386
 387 void
 388 set_video_mode() {
 389         Uint32 flag;
 390
 391         // Attempt to get the required video size
 392         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 393         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 394         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 395 }
 396
 397 void
 398 toggle_fullscreen() {
 399         opt_fullscreen = 1 - opt_fullscreen;
 400         set_video_mode();
 401         if(paused) {
 402                 draw();
 403         }
 404 }
 405
 406
 407 int
 408 init(void) {
 409
 410         int i;
 411         char *s;
 412
 413         // Where are our data files?
 414         if(!find_files()) exit(1);
 415         read_high_score_table();
 416
 417         if(opt_sound) {
 418                 // Initialize SDL with audio and video
 419                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 420                         opt_sound = 0;
 421                         fputs("Can't open sound, starting without it\n", stderr);
 422                         atexit(SDL_Quit);
 423                 } else {
 424                         atexit(SDL_Quit);
 425                         atexit(SDL_CloseAudio);
 426                         opt_sound = init_sound();
 427                 }
 428         } else {
 429                 // Initialize with video only
 430                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 431                 atexit(SDL_Quit);
 432         }
 433
 434         play_tune(TUNE_TITLE_PAGE);
 435
 436
 437         // Attempt to get the required video size
 438         set_video_mode();
 439
 440         // Set the title bar text
 441         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 442
 443         NULLERROR(surf_screen);
 444
 445         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 446         for(i = 0; i<W*3; i++) {
 447                 heatcolor[i] = SDL_MapRGB(
 448                         surf_screen->format,
 449                         (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?
 450                 );
 451         }
 452
 453         // Load the banners
 454         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 455         NULLERROR(surf_b_on = load_image("b_on.png"));
 456         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 457
 458         NULLERROR(surf_b_game = load_image("b_game.png"));
 459         NULLERROR(surf_b_over = load_image("b_over.png"));
 460
 461         // Load the life indicator (small ship) graphic.
 462         NULLERROR(surf_life = load_image("life.png"));
 463
 464         // Load the font image
 465         s = add_data_path("font.png");
 466         if(s) {
 467                 g_font = font_load(s);
 468                 atexit(&font_cleanup);
 469         } else {
 470                 fprintf(stderr, "could create path to font\n");
 471                 exit(1);
 472         }
 473
 474         init_dots();
 475         init_dust();
 476
 477         init_sprites();
 478         add_sprite(SPRITE(&ship));
 479
 480         // Remove the mouse cursor
 481 #ifdef SDL_DISABLE
 482         SDL_ShowCursor(SDL_DISABLE);
 483 #endif
 484
 485         return 0;
 486 }
 487
 488 void
 489 show_lives(void)
 490 {
 491         int i;
 492         SDL_Rect dest;
 493
 494         for(i=0; i<ship.lives-1; i++) {
 495                 dest.x = (i + 1)*(surf_life->w + 10);
 496                 dest.y = 20;
 497                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 498         }
 499 }
 500
 501 void
 502 draw_game_over(void)
 503 {
 504         int x;
 505         char *text0, *text1;
 506         SDL_Rect dest;
 507
 508         fadetimer += t_frame;
 509
 510         dest.x = (XSIZE-surf_b_game->w)/2;
 511         dest.y = (YSIZE-surf_b_game->h)/2-40;
 512         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 513
 514         dest.x = (XSIZE-surf_b_over->w)/2;
 515         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 516         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 517
 518         if(new_high_score(score)) {
 519                 text0 = "New High Score!";
 520                 text1 = "Press SPACE to continue";
 521         } else {
 522                 text0 = msgs[g_easy][0];
 523                 text1 = msgs[g_easy][1];
 524         }
 525
 526         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 527         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 528
 529         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 530         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 531 }
 532
 533 void
 534 draw_title_page(void)
 535 {
 536         int x;
 537         char *text;
 538         SDL_Rect dest;
 539
 540         fadetimer += t_frame/2.0;
 541
 542         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 543         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 544         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 545
 546         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 547         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 548         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 549
 550         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 551         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 552         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 553
 554         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 555         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 556         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 557
 558         text = "Version " PACKAGE_VERSION;
 559         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 560         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 561 }
 562
 563 void
 564 draw(void)
 565 {
 566         SDL_FillRect(surf_screen,NULL,0);  // black background
 567         draw_dots();            // background dots
 568         draw_sprite(SPRITE(&ship));
 569         draw_rocks();
 570
 571         show_lives();
 572         show_score();
 573
 574         switch (state) {
 575                 case GAME_OVER:
 576                         draw_game_over();
 577                         break;
 578
 579                 case TITLE_PAGE:
 580                         draw_title_page();
 581                         break;
 582
 583                 case HIGH_SCORE_ENTRY:
 584                 case HIGH_SCORE_DISPLAY:
 585                         display_scores(150,50);
 586                         break;
 587
 588                 case GAMEPLAY:
 589                 case DEAD_PAUSE:
 590                         ; // no action necessary
 591         }
 592
 593         // Update the surface
 594         SDL_Flip(surf_screen);
 595 }
 596
 597 static inline void
 598 kill_ship(struct ship *ship)
 599 {
 600         play_sound(SOUND_BANG);
 601         new_bang_dots(SPRITE(ship));
 602         if(--ship->lives) {
 603                 state = DEAD_PAUSE;
 604                 state_timeout = DEAD_PAUSE_LENGTH;
 605                 // want ship to be invisible, but keep drifting at sqrt(speed)
 606                 // to leave it in the middle of the space from the explosion.
 607                 ship->flags = MOVE;
 608                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 609                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 610                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 611         } else {
 612                 state = GAME_OVER;
 613                 play_tune(TUNE_TITLE_PAGE);
 614                 state_timeout = 200.0;
 615                 fadetimer = 0.0;
 616                 ship->flags = 0;
 617                 // scrolling is based on the ship speed, so we need to reset it.
 618                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 619         }
 620 }
 621
 622 void
 623 do_collision(Sprite *a, Sprite *b)
 624 {
 625         if(a->type == SHIP) kill_ship((struct ship *)a);
 626         else if(b->type == SHIP) kill_ship((struct ship *)b);
 627         else bounce(a, b);
 628 }
 629
 630 void
 631 init_score_entry(void)
 632 {
 633         SDL_Event e;
 634         state = HIGH_SCORE_ENTRY;
 635         state_timeout = 5.0e6;
 636         SDL_EnableUNICODE(1);
 637         while(SDL_PollEvent(&e))
 638                 ;
 639         insert_score(score);
 640 }
 641
 642 // Count down the state timer, and change state when it gets to zero or less;
 643 void
 644 update_state(void)
 645 {
 646         state_timeout -= t_frame*3;
 647         if(state_timeout > 0) return;
 648
 649         switch(state) {
 650                 case GAMEPLAY: break;  // no action necessary
 651                 case DEAD_PAUSE:
 652                         // Restore the ship and continue playing
 653                         ship.flags = DRAW|MOVE|COLLIDE;
 654                         state = GAMEPLAY;
 655                         break;
 656                 case GAME_OVER:
 657                         if(new_high_score(score)) init_score_entry();
 658                         else {
 659                                 state = HIGH_SCORE_DISPLAY;
 660                                 state_timeout = 400;
 661                         }
 662                         break;
 663                 case HIGH_SCORE_DISPLAY:
 664                         state = TITLE_PAGE;
 665                         state_timeout = 600.0;
 666                         fadetimer = 0.0;
 667                         break;
 668                 case HIGH_SCORE_ENTRY:
 669                         break;
 670                 case TITLE_PAGE:
 671                         state = HIGH_SCORE_DISPLAY;
 672                         state_timeout = 200.0;
 673                         break;
 674         }
 675 }
 676
 677 void
 678 gameloop() {
 679         SDL_Event e;
 680         Uint8 *keystate;
 681         float tmp;
 682
 683         for(;;) {
 684                 ms_frame = SDL_GetTicks() - ms_end;
 685                 ms_end += ms_frame;
 686                 if(ms_frame > 50) {
 687                         ms_frame = 50;
 688                 }
 689                 t_frame = gamespeed * ms_frame / 50;
 690                 frames++;
 691
 692                 if(opt_autopilot) {
 693                         autopilot(t_frame);
 694                 }
 695
 696                 while(paused ? SDL_WaitEvent(&e) : SDL_PollEvent(&e)) {
 697                         switch(e.type) {
 698                                 case SDL_QUIT: return;
 699                                 case SDL_KEYDOWN:
 700                                         // even during high-score entry
 701                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 702                                                 return;
 703                                         }
 704
 705                                         if(state == HIGH_SCORE_ENTRY) {
 706                                                 if(!process_score_input(&e.key.keysym)) {
 707                                                         // Write the high score table to the file
 708                                                         write_high_score_table();
 709                                                         // continue to display the scores briefly
 710                                                         state = HIGH_SCORE_DISPLAY;
 711                                                         state_timeout = 200;
 712                                                 }
 713                                         } else {
 714                                                 switch(e.key.keysym.sym) {
 715                                                         case SDLK_q:
 716                                                                 return;
 717                                                         case SDLK_3:
 718                                                         case SDLK_PRINT:
 719                                                                 {
 720                                                                         FILE *screenshot_fp;
 721                                                                         char tmp[30];
 722                                                                         char *screenshot_filename = &(tmp[0]);
 723                                                                         for(;;) {
 724                                                                                 snprintf(screenshot_filename, 30, "vor-screenshot-%02i.bmp", screenshot_number++);
 725                                                                                 screenshot_fp = fopen(screenshot_filename, "r");
 726                                                                                 if(screenshot_fp) {
 727                                                                                         fclose(screenshot_fp);
 728                                                                                 } else {
 729                                                                                         break;
 730                                                                                 }
 731                                                                         }
 732                                                                         SDL_SaveBMP(surf_screen, screenshot_filename);
 733                                                                 }
 734                                                                 break;
 735                                                         case SDLK_SPACE:
 736                                                                 if(state != GAMEPLAY && state != DEAD_PAUSE) {
 737                                                                         // don't conflict with space key to start a new game
 738                                                                         break;
 739                                                                 }
 740                                                                 // else fall through
 741                                                         case SDLK_p:
 742                                                         case SDLK_PAUSE:
 743                                                                 paused = !paused;
 744                                                                 if(paused) {
 745                                                                         pause_tune();
 746                                                                 } else {
 747                                                                         resume_tune();
 748                                                                         ms_end = SDL_GetTicks();
 749                                                                 }
 750                                                                 break;
 751                                                         case SDLK_f:
 752                                                         case SDLK_F11:
 753                                                                 toggle_fullscreen();
 754                                                                 break;
 755                                                         default:
 756                                                                 // other keys are handled by checking keystate each frame
 757                                                                 break;
 758                                                 }
 759                                         }
 760                                         break;
 761                         }
 762                 }
 763                 keystate = SDL_GetKeyState(NULL);
 764                 if(opt_autopilot) {
 765                         autopilot_fix_keystates(keystate);
 766                 }
 767
 768                 if(state == GAMEPLAY) {
 769                         if(!paused) {
 770                                 score += ms_frame;
 771
 772                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_KP4]) {
 773                                         ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;
 774                                 }
 775                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_KP5] || keystate[SDLK_KP2]) {
 776                                         ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;
 777                                 }
 778                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_KP6]) {
 779                                         ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;
 780                                 }
 781                                 if(keystate[SDLK_UP]    || keystate[SDLK_KP8]) {
 782                                         ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;
 783                                 }
 784                                 if(ship.jets) {
 785                                         ship.dx = fconstrain2(ship.dx, -50, 50);
 786                                         ship.dy = fconstrain2(ship.dy, -50, 50);
 787                                 }
 788                         }
 789
 790                 }
 791
 792                 if(!paused) {
 793                         update_state();
 794
 795                         // SCROLLING
 796                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 797                         screendy += tmp * t_frame/12;
 798                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 799                         screendx += tmp * t_frame/12;
 800                         // taper off so we don't hit the barrier abruptly.
 801                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 802                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 803                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 804                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 805                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 806
 807                         move_sprites();
 808                         move_dots();
 809                         move_dust();
 810
 811                         new_rocks();
 812
 813                         // BOUNCE off left or right edge of screen
 814                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 815                                 ship.x -= (ship.dx-screendx)*t_frame;
 816                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 817                                 ship.x = fconstrain(ship.x, XSIZE - ship.w);
 818                         }
 819
 820                         // BOUNCE off top or bottom of screen
 821                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 822                                 ship.y -= (ship.dy-screendy)*t_frame;
 823                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 824                                 ship.y = fconstrain(ship.y, YSIZE - ship.h);
 825                         }
 826
 827                         new_engine_dots();
 828
 829                         collisions(); // must happen after ship bouncing because it puts pixels where the ship is (thus the ship must be on the screen)
 830
 831
 832                         draw();
 833
 834                         // new game
 835                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 836                            && (state == HIGH_SCORE_DISPLAY
 837                                || state == TITLE_PAGE
 838                                || state == GAME_OVER)) {
 839                                 if(state == GAME_OVER && new_high_score(score))
 840                                         init_score_entry();
 841                                 else {
 842                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 843                                                 g_easy = 0;
 844                                                 initial_rocks = NORMAL_I_ROCKS;
 845                                                 final_rocks = NORMAL_F_ROCKS;
 846                                                 if(gamespeed == EASY_GAMESPEED)
 847                                                         gamespeed = NORMAL_GAMESPEED;
 848                                         } else if(keystate[SDLK_1]) {
 849                                                 g_easy = 1;
 850                                                 initial_rocks = EASY_I_ROCKS;
 851                                                 final_rocks = EASY_F_ROCKS;
 852                                                 gamespeed = EASY_GAMESPEED;
 853                                         }
 854                                         reset_sprites();
 855                                         reset_rocks();
 856                                         screendx = BARRIER_SPEED; screendy = 0;
 857
 858                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 859                                         ship.dx = screendx; ship.dy = screendy;
 860                                         ship.lives = 4;
 861                                         ship.flags = MOVE|DRAW|COLLIDE;
 862                                         add_sprite(SPRITE(&ship));
 863
 864                                         score = 0;
 865
 866                                         state = GAMEPLAY;
 867                                         play_tune(TUNE_GAMEPLAY);
 868                                 }
 869                         }
 870
 871                         ship.jets = 0;
 872                 }
 873
 874                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 875                         state = HIGH_SCORE_DISPLAY;
 876                         state_timeout = 400;
 877                 }
 878
 879                 tiny_sleep();
 880         }
 881 }
 882
 883 int
 884 main(int argc, char **argv) {
 885         if(!parse_opts(argc, argv)) return 1;
 886
 887         if(init()) {
 888                 printf ("vor: SDL error: '%s'\n",initerror);
 889                 return 1;
 890         }
 891
 892         start = SDL_GetTicks();
 893         frames = 0;
 894         gameloop();
 895         end = SDL_GetTicks();
 896         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 897
 898         return 0;
 899 }