main.c

   1 /* Variations on RockDodger
   2  * Space Rocks copyright (C) 2001 Paul Holt <pad@pcholt.com>
   3  *
   4  * Project fork 2004, Jason Woofenden and Joshua Grams.
   5  * (a whole bunch of modifications and project rename)
   6
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <math.h>
  23 #include <SDL.h>
  24 #include <SDL_image.h>
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "font.h"
  31
  32 #include "args.h"
  33 #include "common.h"
  34 #include "config.h"
  35 #include "dust.h"
  36 #include "file.h"
  37 #include "float.h"
  38 #include "globals.h"
  39 #include "mt.h"
  40 #include "rocks.h"
  41 #include "score.h"
  42 #include "sprite.h"
  43 #include "sound.h"
  44
  45 // ************************************* VARS
  46 // SDL_Surface global variables
  47 SDL_Surface
  48         *surf_screen,   // Screen
  49         *surf_b_variations, // "variations" banner
  50         *surf_b_on, // "on" banner
  51         *surf_b_rockdodger, // "rockdodger" banner
  52         *surf_b_game,   // Title element "game"
  53         *surf_b_over,   // Title element "over"
  54         *surf_life,     // Indicator of number of ships remaining
  55         *surf_rock[NROCKS],     // THE ROCKS
  56         *surf_font_big; // The big font
  57
  58
  59 font *g_font;
  60
  61 // Structure global variables
  62 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
  63 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
  64
  65 // Other global variables
  66 char topline[1024];
  67 char *initerror = "";
  68
  69 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
  70
  71 float screendx = BARRIER_SPEED, screendy = 0.0;
  72 float dist_ahead;
  73
  74 // all movement is based on t_frame.
  75 unsigned long frames, start, end;
  76 float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for gamespeed
  77 int ms_frame;   // length of this frame (milliseconds)
  78 int ms_end;     // end of this frame (milliseconds)
  79
  80 float gamespeed = 1.00;
  81
  82 int score;
  83
  84 float fadetimer = 0;
  85
  86 int pausedown = 0, paused = 0;
  87
  88 // bangdot start (bd1) and end (bd2) position:
  89 int bd1 = 0, bd2 = 0;
  90
  91 enum states {
  92         TITLE_PAGE,
  93         GAMEPLAY,
  94         DEAD_PAUSE,
  95         GAME_OVER,
  96         HIGH_SCORE_ENTRY,
  97         HIGH_SCORE_DISPLAY
  98 };
  99 enum states state = TITLE_PAGE;
 100 float state_timeout = 600.0;
 101
 102 #define NSEQUENCE 3
 103 char *msgs[2][3] = {
 104         {
 105                 "Press SPACE for normal game",
 106                 "Press '1' for easy game",
 107                 "http://jasonwoof.org/vor"
 108         },
 109         {
 110                 "Press SPACE for easy game",
 111                 "Press '2' for normal game",
 112                 "http://jasonwoof.org/vor"
 113         }
 114 };
 115
 116 int bangdotlife, nbangdots;
 117 Uint16 heatcolor[W*3];
 118
 119 char *data_dir;
 120 extern char *optarg;
 121 extern int optind, opterr, optopt;
 122
 123 #define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 124
 125 // ************************************* FUNCS
 126
 127 void
 128 init_engine_dots() {
 129         int i;
 130         for(i = 0; i<MAXENGINEDOTS; i++) {
 131                 edot[i].active = 0;
 132         }
 133 }
 134
 135 void
 136 new_bang_dots(struct sprite *s)
 137 {
 138         int i, n, x, y;
 139         uint16_t *pixel, c;
 140         uint32_t colorkey;
 141         int row_inc;
 142         double theta, r;
 143         SDL_Surface *img = s->image;
 144
 145         n = 20;
 146         pixel = img->pixels;
 147         row_inc = img->pitch/sizeof(uint16_t) - img->w;
 148         colorkey = img->format->colorkey;
 149
 150         if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
 151
 152         for(i=0; i<n; i++) {
 153                 pixel = img->pixels;
 154                 for(y=0; y<img->h; y++) {
 155                         for(x = 0; x<img->w; x++) {
 156                                 c = *pixel++;
 157                                 if(c && c != colorkey) {
 158                                         theta = frnd()*M_PI*2;
 159                                         r = frnd(); r = 1 - r*r;
 160
 161                                         bdot[bd2].dx = 45*r*cos(theta) + s->dx;
 162                                         bdot[bd2].dy = 45*r*sin(theta) + s->dy;
 163                                         bdot[bd2].x = x + s->x;
 164                                         bdot[bd2].y = y + s->y;
 165                                         //bdot[bd2].c = (i < n-3) ? 0 : c;
 166                                         bdot[bd2].life = frnd() * 99;
 167                                         bdot[bd2].decay = frnd()*3 + 1;
 168                                         bdot[bd2].active = 1;
 169
 170                                         bd2 = (bd2+1) % MAXBANGDOTS;
 171                                 }
 172                                 pixel += row_inc;
 173                         }
 174                 }
 175         }
 176
 177         if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
 178 }
 179
 180 void
 181 move_bang_dots(float ticks)
 182 {
 183         int i;
 184         Sprite *hit;
 185
 186         for(i=0; i<MAXBANGDOTS; i++) {
 187                 if(!bdot[i].active) continue;
 188
 189                 // decrement life and maybe kill
 190                 bdot[i].life -= bdot[i].decay * ticks/2.0;
 191                 if(bdot[i].life < 0) { bdot[i].active = 0; continue; }
 192
 193                 // move and clip
 194                 bdot[i].x += (bdot[i].dx - screendx)*ticks;
 195                 bdot[i].y += (bdot[i].dy - screendy)*ticks;
 196                 if(fclip(bdot[i].x, XSIZE) || fclip(bdot[i].y, YSIZE)) {
 197                         bdot[i].active = 0;
 198                         continue;
 199                 }
 200
 201                 // check collisions
 202                 if((hit = pixel_collides(bdot[i].x, bdot[i].y))) {
 203                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 204                                 bdot[i].active = 0;
 205                                 hit->dx += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dx / sprite_mass(hit);
 206                                 hit->dy += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dy / sprite_mass(hit);
 207                                 continue;
 208                         }
 209                 }
 210         }
 211 }
 212
 213
 214 void
 215 draw_bang_dots(SDL_Surface *s)
 216 {
 217         int i;
 218         uint16_t *pixels, *pixel, c;
 219         int row_inc = s->pitch/sizeof(uint16_t);
 220
 221         pixels = (uint16_t *) s->pixels;
 222
 223         for(i=0; i<MAXBANGDOTS; i++) {
 224                 if(!bdot[i].active) continue;
 225
 226                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 227                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 228                 *pixel = c;
 229         }
 230 }
 231
 232
 233 void
 234 new_engine_dots(float time_span) {
 235         int dir, i;
 236         int n = time_span * ENGINE_DOTS_PER_TIC;
 237         float a, r;  // angle, random length
 238         float dx, dy;
 239         float hx, hy; // half ship width/height.
 240         static const int s[4] = { 2, 1, 0, 1 };
 241         float time;
 242         float accelh, accelv, past_ship_dx, past_ship_dy;
 243
 244         hx = ship.image->w / 2;
 245         hy = ship.image->h / 2;
 246
 247         for(dir=0; dir<4; dir++) {
 248                 if(!(ship.jets & 1<<dir)) continue;
 249
 250                 for(i = 0; i<n; i++) {
 251                         if(dotptr->active == 0) {
 252                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 253                                 r = sin(frnd()*M_PI);
 254                                 dx = r * cos(a);
 255                                 dy = r * -sin(a);  // screen y is "backwards".
 256
 257                                 dotptr->active = 1;
 258
 259                                 // dot was created at a random time during the time span
 260                                 time = frnd() * time_span; // this is how long ago
 261
 262                                 // calculate how fast the ship was going when this engine dot was
 263                                 // created (as if it had a smooth acceleration). This is used in
 264                                 // determining the velocity of the dots, but not their starting
 265                                 // location.
 266                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 267                                 accelh *= THRUSTER_STRENGTH * time;
 268                                 past_ship_dx = ship.dx - accelh;
 269                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 270                                 accelv *= THRUSTER_STRENGTH * time;
 271                                 past_ship_dy = ship.dy - accelv;
 272
 273                                 // the starting position (not speed) of the dot is calculated as
 274                                 // though the ship were traveling at a constant speed for this
 275                                 // time_span.
 276                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 277                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 278                                 if(dir&1) {
 279                                         dotptr->dx = past_ship_dx + 2*dx;
 280                                         dotptr->dy = past_ship_dy + 20*dy;
 281                                         dotptr->life = 60 * fabs(dy);
 282                                 } else {
 283                                         dotptr->dx = past_ship_dx + 20*dx;
 284                                         dotptr->dy = past_ship_dy + 2*dy;
 285                                         dotptr->life = 60 * fabs(dx);
 286                                 }
 287
 288                                 // move the dot as though it were created in the past
 289                                 dotptr->x += (dotptr->dx - screendx) * time;
 290                                 dotptr->y += (dotptr->dy - screendy) * time;
 291
 292                                 if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 293                                 else dotptr = edot;
 294                         }
 295                 }
 296         }
 297 }
 298
 299 void
 300 move_engine_dots(float ticks) {
 301         int i;
 302         Sprite *hit;
 303
 304         for(i = 0; i<MAXENGINEDOTS; i++) {
 305                 if(!edot[i].active) continue;
 306
 307                 edot[i].x += (edot[i].dx - screendx)*ticks;
 308                 edot[i].y += (edot[i].dy - screendy)*ticks;
 309                 edot[i].life -= t_frame*3;
 310                 if(edot[i].life < 0 || fclip(edot[i].x, XSIZE) || fclip(edot[i].y, YSIZE)) {
 311                         edot[i].active = 0;
 312                         continue;
 313                 }
 314
 315                 // check collisions
 316                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 317                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 318                                 edot[i].active = 0;
 319                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 320                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 321                                 continue;
 322                         }
 323                 }
 324         }
 325 }
 326
 327 void
 328 draw_engine_dots(SDL_Surface *s) {
 329         int i;
 330         uint16_t c;
 331         uint16_t *pixels = (uint16_t *) s->pixels;
 332         int row_inc = s->pitch/sizeof(uint16_t);
 333         int heatindex;
 334
 335         for(i = 0; i<MAXENGINEDOTS; i++) {
 336                 if(!edot[i].active) continue;
 337
 338                 heatindex = edot[i].life * 6;
 339                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 340                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 341         }
 342 }
 343
 344 void
 345 draw_dots(SDL_Surface *s) {
 346         if(SDL_MUSTLOCK(s)) { SDL_LockSurface(s); }
 347         draw_dust(s);
 348         draw_engine_dots(s);
 349         draw_bang_dots(s);
 350         if(SDL_MUSTLOCK(s)) { SDL_UnlockSurface(s); }
 351 }
 352
 353 SDL_Surface *
 354 load_image(char *filename)
 355 {
 356         SDL_Surface *tmp, *img = NULL;
 357         char *s = add_data_path(filename);
 358         if(s) {
 359                 tmp = IMG_Load(s);
 360                 free(s);
 361                 if(tmp) {
 362                         img = SDL_DisplayFormat(tmp);
 363                         SDL_FreeSurface(tmp);
 364                 }
 365         }
 366         return img;
 367 }
 368
 369 void
 370 load_ship(void)
 371 {
 372         load_sprite(SPRITE(&ship), "ship.png");
 373 }
 374
 375 void font_cleanup() {
 376         font_free(g_font);
 377 }
 378
 379 int
 380 init(void) {
 381
 382         int i;
 383         char *s;
 384         Uint32 flag;
 385
 386         // Where are our data files?
 387         if(!find_files()) exit(1);
 388         read_high_score_table();
 389
 390         if(opt_sound) {
 391                 // Initialize SDL with audio and video
 392                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 393                         opt_sound = 0;
 394                         fputs("Can't open sound, starting without it\n", stderr);
 395                         atexit(SDL_Quit);
 396                 } else {
 397                         atexit(SDL_Quit);
 398                         atexit(SDL_CloseAudio);
 399                         opt_sound = init_sound();
 400                 }
 401         } else {
 402                 // Initialize with video only
 403                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 404                 atexit(SDL_Quit);
 405         }
 406
 407         play_tune(TUNE_TITLE_PAGE);
 408
 409         // Attempt to get the required video size
 410         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 411         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 412         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 413
 414         // Set the title bar text
 415         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 416
 417         NULLERROR(surf_screen);
 418
 419         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 420         for(i = 0; i<W*3; i++) {
 421                 heatcolor[i] = SDL_MapRGB(
 422                         surf_screen->format,
 423                         (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?
 424                 );
 425         }
 426
 427         // Load the banners
 428         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 429         NULLERROR(surf_b_on = load_image("b_on.png"));
 430         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 431
 432         NULLERROR(surf_b_game = load_image("b_game.png"));
 433         NULLERROR(surf_b_over = load_image("b_over.png"));
 434
 435         // Load the life indicator (small ship) graphic.
 436         NULLERROR(surf_life = load_image("life.png"));
 437
 438         // Load the font image
 439         s = add_data_path("font.png");
 440         if(s) {
 441                 g_font = font_load(s);
 442                 atexit(&font_cleanup);
 443         } else {
 444                 fprintf(stderr, "could create path to font\n");
 445                 exit(1);
 446         }
 447
 448         init_engine_dots();
 449         init_dust();
 450
 451         init_sprites();
 452         add_sprite(SPRITE(&ship));
 453
 454         // Remove the mouse cursor
 455 #ifdef SDL_DISABLE
 456         SDL_ShowCursor(SDL_DISABLE);
 457 #endif
 458
 459         return 0;
 460 }
 461
 462 void
 463 show_lives(void)
 464 {
 465         int i;
 466         SDL_Rect dest;
 467
 468         for(i=0; i<ship.lives-1; i++) {
 469                 dest.x = (i + 1)*(surf_life->w + 10);
 470                 dest.y = 20;
 471                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 472         }
 473 }
 474
 475 void
 476 draw_game_over(void)
 477 {
 478         int x;
 479         char *text0, *text1;
 480         SDL_Rect dest;
 481
 482         fadetimer += t_frame;
 483
 484         dest.x = (XSIZE-surf_b_game->w)/2;
 485         dest.y = (YSIZE-surf_b_game->h)/2-40;
 486         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 487
 488         dest.x = (XSIZE-surf_b_over->w)/2;
 489         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 490         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 491
 492         if(new_high_score(score)) {
 493                 text0 = "New High Score!";
 494                 text1 = "Press SPACE to continue";
 495         } else {
 496                 text0 = msgs[g_easy][0];
 497                 text1 = msgs[g_easy][1];
 498         }
 499
 500         x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
 501         font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 502
 503         x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
 504         font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 505 }
 506
 507 void
 508 draw_title_page(void)
 509 {
 510         int x;
 511         char *text;
 512         SDL_Rect dest;
 513
 514         fadetimer += t_frame/2.0;
 515
 516         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 517         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 518         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 519
 520         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 521         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 522         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 523
 524         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 525         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 526         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 527
 528         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 529         x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
 530         font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 531
 532         text = "Version " VERSION;
 533         x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
 534         font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 535 }
 536
 537 void
 538 draw(void)
 539 {
 540         SDL_FillRect(surf_screen,NULL,0);  // black background
 541         draw_dots(surf_screen);            // background dots
 542         draw_sprite(SPRITE(&ship));
 543         draw_rocks();
 544
 545         show_lives();
 546         show_score();
 547
 548         switch (state) {
 549                 case GAME_OVER: draw_game_over(); break;
 550
 551                 case TITLE_PAGE: draw_title_page(); break;
 552
 553                 case HIGH_SCORE_ENTRY: play_tune(TUNE_HIGH_SCORE_ENTRY);
 554                         // and fall through to
 555                 case HIGH_SCORE_DISPLAY:
 556                         // Display de list o high scores mon.
 557                         display_scores(surf_screen, 150,50);
 558                         break;
 559                 case GAMEPLAY:
 560                 case DEAD_PAUSE:
 561                         ; // no action necessary
 562         }
 563
 564         // Update the surface
 565         SDL_Flip(surf_screen);
 566 }
 567
 568 static inline void
 569 kill_ship(struct ship *ship)
 570 {
 571         play_sound(SOUND_BANG);
 572         new_bang_dots(SPRITE(ship));
 573         if(--ship->lives) {
 574                 state = DEAD_PAUSE;
 575                 state_timeout = DEAD_PAUSE_LENGTH;
 576                 // want ship to be invisible, but keep drifting at sqrt(speed)
 577                 // to leave it in the middle of the space from the explosion.
 578                 ship->flags = MOVE;
 579                 ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
 580                 ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
 581                 if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
 582         } else {
 583                 state = GAME_OVER;
 584                 state_timeout = 200.0;
 585                 fadetimer = 0.0;
 586                 ship->flags = 0;
 587                 // scrolling is based on the ship speed, so we need to reset it.
 588                 ship->dx = BARRIER_SPEED; ship->dy = 0;
 589         }
 590 }
 591
 592 void
 593 do_collision(Sprite *a, Sprite *b)
 594 {
 595         if(a->type == SHIP) kill_ship((struct ship *)a);
 596         else if(b->type == SHIP) kill_ship((struct ship *)b);
 597         else bounce(a, b);
 598 }
 599
 600 void
 601 init_score_entry(void)
 602 {
 603         SDL_Event e;
 604         state = HIGH_SCORE_ENTRY;
 605         state_timeout = 5.0e6;
 606         SDL_EnableUNICODE(1);
 607         while(SDL_PollEvent(&e))
 608                 ;
 609         insert_score(score);
 610 }
 611
 612 // Count down the state timer, and change state when it gets to zero or less;
 613 void
 614 update_state(float ticks)
 615 {
 616         state_timeout -= ticks*3;
 617         if(state_timeout > 0) return;
 618
 619         switch(state) {
 620                 case GAMEPLAY: break;  // no action necessary
 621                 case DEAD_PAUSE:
 622                         // Restore the ship and continue playing
 623                         ship.flags = DRAW|MOVE|COLLIDE;
 624                         state = GAMEPLAY;
 625                         play_tune(TUNE_GAMEPLAY);
 626                         break;
 627                 case GAME_OVER:
 628                         if(new_high_score(score)) init_score_entry();
 629                         else {
 630                                 state = HIGH_SCORE_DISPLAY;
 631                                 state_timeout = 400;
 632                         }
 633                         break;
 634                 case HIGH_SCORE_DISPLAY:
 635                         state = TITLE_PAGE;
 636                         state_timeout = 600.0;
 637                         fadetimer = 0.0;
 638                         break;
 639                 case HIGH_SCORE_ENTRY:
 640                         break;
 641                 case TITLE_PAGE:
 642                         state = HIGH_SCORE_DISPLAY;
 643                         state_timeout = 200.0;
 644                         break;
 645         }
 646 }
 647
 648 void
 649 gameloop() {
 650         SDL_Event e;
 651         Uint8 *keystate;
 652         float tmp;
 653
 654         for(;;) {
 655                 ms_frame = SDL_GetTicks() - ms_end;
 656                 ms_end += ms_frame;
 657                 if(ms_frame > 1000) {
 658                         ms_frame = 1000;
 659                 }
 660                 t_frame = gamespeed * ms_frame / 50;
 661                 frames++;
 662
 663                 while(SDL_PollEvent(&e)) {
 664                         switch(e.type) {
 665                                 case SDL_QUIT: return;
 666                                 case SDL_KEYDOWN:
 667                                         if(state == HIGH_SCORE_ENTRY) {
 668                                                 if(!process_score_input(&e.key.keysym)) {
 669                                                         // Write the high score table to the file
 670                                                         write_high_score_table();
 671                                                         // continue to display the scores briefly
 672                                                         state = HIGH_SCORE_DISPLAY;
 673                                                         state_timeout = 200;
 674                                                         play_tune(TUNE_TITLE_PAGE);
 675                                                 }
 676                                         } else if(e.key.keysym.sym == SDLK_q) {
 677                                                 return;
 678                                         }
 679
 680                                         if(e.key.keysym.sym == SDLK_ESCAPE) {
 681                                                 return;
 682                                         }
 683                                         break;
 684                         }
 685                 }
 686                 keystate = SDL_GetKeyState(NULL);
 687
 688                 if(state == GAMEPLAY) {
 689                         if(!paused) {
 690                                 score += ms_frame;
 691
 692                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_h]) { ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;}
 693                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_t]) { ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;}
 694                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_n]) { ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;}
 695                                 if(keystate[SDLK_UP]    || keystate[SDLK_c]) { ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;}
 696                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 697                         }
 698
 699                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 700                                 if(!pausedown) {
 701                                         paused = !paused;
 702                                         pausedown = 1;
 703                                         if(!paused) ms_end = SDL_GetTicks();
 704                                 }
 705                         } else {
 706                                 pausedown = 0;
 707                         }
 708                 }
 709
 710                 if(!paused) {
 711                         update_state(t_frame);
 712
 713                         // SCROLLING
 714                         tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 715                         screendy += tmp * t_frame/12;
 716                         tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 717                         screendx += tmp * t_frame/12;
 718                         // taper off so we don't hit the barrier abruptly.
 719                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 720                         if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
 721                                 screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
 722                         dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
 723                         if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 724
 725                         move_sprites(t_frame);  new_rocks(t_frame);
 726                         move_engine_dots(t_frame); new_engine_dots(t_frame);
 727                         move_bang_dots(t_frame);
 728                         move_dust(t_frame);
 729
 730                         collisions();
 731
 732                         // BOUNCE off left or right edge of screen
 733                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 734                                 ship.x -= (ship.dx-screendx)*t_frame;
 735                                 ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
 736                         }
 737
 738                         // BOUNCE off top or bottom of screen
 739                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 740                                 ship.y -= (ship.dy-screendy)*t_frame;
 741                                 ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
 742                         }
 743
 744                         draw();
 745
 746                         // new game
 747                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 748                            && (state == HIGH_SCORE_DISPLAY
 749                                || state == TITLE_PAGE
 750                                || state == GAME_OVER)) {
 751                                 if(state == GAME_OVER && new_high_score(score))
 752                                         init_score_entry();
 753                                 else {
 754                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 755                                                 g_easy = 0;
 756                                                 initial_rocks = NORMAL_I_ROCKS;
 757                                                 final_rocks = NORMAL_F_ROCKS;
 758                                                 if(gamespeed == EASY_GAMESPEED)
 759                                                         gamespeed = NORMAL_GAMESPEED;
 760                                         } else if(keystate[SDLK_1]) {
 761                                                 g_easy = 1;
 762                                                 initial_rocks = EASY_I_ROCKS;
 763                                                 final_rocks = EASY_F_ROCKS;
 764                                                 gamespeed = EASY_GAMESPEED;
 765                                         }
 766                                         reset_sprites();
 767                                         reset_rocks();
 768                                         screendx = BARRIER_SPEED; screendy = 0;
 769
 770                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 771                                         ship.dx = screendx; ship.dy = screendy;
 772                                         ship.lives = 4;
 773                                         ship.flags = MOVE|DRAW|COLLIDE;
 774                                         add_sprite(SPRITE(&ship));
 775
 776                                         score = 0;
 777
 778                                         state = GAMEPLAY;
 779                                         play_tune(TUNE_GAMEPLAY);
 780                                 }
 781                         }
 782
 783                         ship.jets = 0;
 784                 }
 785
 786                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 787                         state = HIGH_SCORE_DISPLAY;
 788                         state_timeout = 400;
 789                 }
 790         }
 791 }
 792
 793 int
 794 main(int argc, char **argv) {
 795         if(!parse_opts(argc, argv)) return 1;
 796
 797         if(init()) {
 798                 printf ("vor: SDL error: '%s'\n",initerror);
 799                 return 1;
 800         }
 801
 802         start = SDL_GetTicks();
 803         frames = 0;
 804         gameloop();
 805         end = SDL_GetTicks();
 806         // printf("%ld frames in %ld ms, %.2f fps.\n", frames, end-start, frames * 1000.0 / (end-start));
 807
 808         return 0;
 809 }