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 <argp.h>
  23 #include <math.h>
  24 #include <SDL.h>
  25 #include <SDL_image.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "SFont.h"
  32
  33 #include "args.h"
  34 #include "common.h"
  35 #include "config.h"
  36 #include "dust.h"
  37 #include "file.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 SFont_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, SCREENDXMIN, 0.0 };
  70
  71 float screendx = SCREENDXMIN, screendy = 0.0;
  72 float back_dist;
  73
  74 // all movement is based on t_frame.
  75 float t_frame;  // length of this frame (in ticks = 1/20th second)
  76 int ms_frame;   // length of this frame (milliseconds)
  77 int ms_end;     // end of this frame (milliseconds)
  78
  79 int bang = false;
  80 float bangx, bangy, bangdx, bangdy;
  81
  82 int score;
  83
  84 float fadetimer = 0, faderate;
  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 2
 103 char *sequence[] = {
 104         "Press SPACE to start",
 105         "http://jasonwoof.org/vor"
 106 };
 107
 108 int bangdotlife, nbangdots;
 109 Uint16 heatcolor[W*3];
 110
 111 char *data_dir;
 112 extern char *optarg;
 113 extern int optind, opterr, optopt;
 114
 115 #define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
 116
 117 // ************************************* FUNCS
 118
 119 void
 120 init_engine_dots() {
 121         int i;
 122         for(i = 0; i<MAXENGINEDOTS; i++) {
 123                 edot[i].active = 0;
 124         }
 125 }
 126
 127 void
 128 new_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s)
 129 {
 130         int x,y,endcount;
 131         uint16_t *pixel,c;
 132         uint32_t colorkey;
 133         int row_inc;
 134         double theta,r;
 135         int begin_generate;
 136
 137         begin_generate = SDL_GetTicks();
 138         pixel = s->pixels;
 139         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 140         colorkey = s->format->colorkey;
 141
 142         SDL_LockSurface(s);
 143
 144         endcount = 0;
 145         while (endcount<3) {
 146                 pixel = s->pixels;
 147                 for(y=0; y<s->h; y++) {
 148                         for(x = 0; x<s->w; x++) {
 149                                 c = *pixel++;
 150                                 if(c && c != colorkey) {
 151                                         theta = frnd()*M_PI*2;
 152                                         r = frnd(); r = 1 - r*r;
 153                                         // r = 1 - frnd()*frnd();
 154
 155                                         bdot[bd2].dx = 45*r*cos(theta) + dx;
 156                                         bdot[bd2].dy = 45*r*sin(theta) + dy;
 157                                         bdot[bd2].x = x + xbang;
 158                                         bdot[bd2].y = y + ybang;
 159                                         bdot[bd2].c = 0;
 160                                         bdot[bd2].life = 100;
 161                                         bdot[bd2].decay = frnd()*3 + 1;
 162                                         bdot[bd2].active = 1;
 163
 164                                         // Replace the last few bang dots with the pixels from the exploding object
 165                                         if(endcount>0) bdot[bd2].c = c;
 166
 167                                         bd2 = (bd2+1) % MAXBANGDOTS;
 168                                 }
 169                                 pixel += row_inc;
 170                         }
 171                 }
 172                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 173         }
 174
 175         SDL_UnlockSurface(s);
 176 }
 177
 178 void
 179 draw_bang_dots(SDL_Surface *s)
 180 {
 181         int i;
 182         int first_i, last_i;
 183         uint16_t *pixels, *pixel, c;
 184         int row_inc = s->pitch/sizeof(uint16_t);
 185
 186         pixels = (uint16_t *) s->pixels;
 187         first_i = -1;
 188         last_i = 0;
 189
 190         for(i=0; i<MAXBANGDOTS; i++) {
 191                 if(!bdot[i].active) continue;
 192
 193                 // decrement life and maybe kill
 194                 bdot[i].life -= bdot[i].decay;
 195                 if(bdot[i].life<0) { bdot[i].active = 0; continue; }
 196
 197                 // move and clip
 198                 bdot[i].x += (bdot[i].dx - screendx)*t_frame;
 199                 bdot[i].y += (bdot[i].dy - screendy)*t_frame;
 200                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 201                         bdot[i].active = 0;
 202                         continue;
 203                 }
 204
 205                 // check collisions
 206                 if(pixel_collides(bdot[i].x, bdot[i].y)) { bdot[i].active = 0; continue; }
 207
 208                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 209                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 210                 *pixel = c;
 211         }
 212 }
 213
 214
 215 void
 216 new_engine_dots(int n, int dir) {
 217         int i;
 218         float a, r;  // angle, random length
 219         float dx, dy;
 220         float hx, hy; // half ship width/height.
 221         static const int s[4] = { 2, 1, 0, 1 };
 222
 223         hx = ship.image->w / 2;
 224         hy = ship.image->h / 2;
 225
 226         for(i = 0; i<n; i++) {
 227                 if(dotptr->active == 0) {
 228                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 229                         r = sin(frnd()*M_PI);
 230                         dx = r * cos(a);
 231                         dy = r * -sin(a);  // screen y is "backwards".
 232
 233                         dotptr->active = 1;
 234                         dotptr->x = ship.x + s[dir]*hx + (frnd()-0.5)*3;
 235                         dotptr->y = ship.y + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 236                         if(dir&1) {
 237                                 dotptr->dx = ship.dx + 2*dx;
 238                                 dotptr->dy = ship.dy + 20*dy;
 239                                 dotptr->life = 60 * fabs(dy);
 240                         } else {
 241                                 dotptr->dx = ship.dx + 20*dx;
 242                                 dotptr->dy = ship.dy + 2*dy;
 243                                 dotptr->life = 60 * fabs(dx);
 244                         }
 245
 246                         if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 247                         else dotptr = edot;
 248                 }
 249         }
 250 }
 251
 252 void
 253 draw_engine_dots(SDL_Surface *s) {
 254         int i;
 255         uint16_t c;
 256         uint16_t *pixels = (uint16_t *) s->pixels;
 257         int row_inc = s->pitch/sizeof(uint16_t);
 258         int heatindex;
 259         Sprite *hit;
 260
 261         for(i = 0; i<MAXENGINEDOTS; i++) {
 262                 if(!edot[i].active) continue;
 263                 edot[i].x += (edot[i].dx - screendx)*t_frame;
 264                 edot[i].y += (edot[i].dy - screendy)*t_frame;
 265                 edot[i].life -= t_frame*3;
 266                 if(edot[i].life < 0
 267                                 || edot[i].x<0 || edot[i].x >= XSIZE
 268                                 || edot[i].y<0 || edot[i].y >= YSIZE) {
 269                         edot[i].active = 0;
 270                         continue;
 271                 }
 272                 // check collisions
 273                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 274                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 275                                 edot[i].active = 0;
 276                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 277                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 278                                 continue;
 279                         }
 280                 }
 281                 heatindex = edot[i].life * 6;
 282                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 283                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 284         }
 285 }
 286
 287 void
 288 drawdots(SDL_Surface *s) {
 289         int m;
 290
 291         // Create engine dots out the side we're moving from
 292         for(m = 0; m<4; m++) {
 293                 if(ship.jets & 1<<m) { // 'jets' is a bit field
 294                         new_engine_dots(80,m);
 295                 }
 296         }
 297
 298         move_dust();
 299
 300         SDL_LockSurface(s);
 301         draw_dust(s);
 302         draw_engine_dots(s);
 303         draw_bang_dots(s);
 304         SDL_UnlockSurface(s);
 305 }
 306
 307 SDL_Surface *
 308 load_image(char *filename)
 309 {
 310         SDL_Surface *tmp, *img = NULL;
 311         char *s = add_data_path(filename);
 312         if(s) {
 313                 tmp = IMG_Load(s);
 314                 free(s);
 315                 if(tmp) {
 316                         img = SDL_DisplayFormat(tmp);
 317                         SDL_FreeSurface(tmp);
 318                 }
 319         }
 320         return img;
 321 }
 322
 323 void
 324 load_ship(void)
 325 {
 326         load_sprite(SPRITE(&ship), "sprites/ship.png");
 327 }
 328
 329 int
 330 init(void) {
 331
 332         int i;
 333         char *s;
 334         Uint32 flag;
 335
 336         // Where are our data files?
 337         if(!find_files()) exit(1);
 338         read_high_score_table();
 339
 340         if(opt_sound) {
 341                 // Initialize SDL with audio and video
 342                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 343                         opt_sound = 0;
 344                         fputs("Can't open sound, starting without it\n", stderr);
 345                         atexit(SDL_Quit);
 346                 } else {
 347                         atexit(SDL_Quit);
 348                         atexit(SDL_CloseAudio);
 349                         opt_sound = init_sound();
 350                 }
 351         } else {
 352                 // Initialize with video only
 353                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 354                 atexit(SDL_Quit);
 355         }
 356
 357         play_tune(TUNE_TITLE_PAGE);
 358
 359         // Attempt to get the required video size
 360         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 361         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 362         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 363
 364         // Set the title bar text
 365         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 366
 367         NULLERROR(surf_screen);
 368
 369         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 370         for(i = 0; i<W*3; i++) {
 371                 heatcolor[i] = SDL_MapRGB(
 372                         surf_screen->format,
 373                         (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?
 374                 );
 375         }
 376
 377         // Load the banners
 378         NULLERROR(surf_b_variations = load_image("banners/variations.png"));
 379         NULLERROR(surf_b_on = load_image("banners/on.png"));
 380         NULLERROR(surf_b_rockdodger = load_image("banners/rockdodger.png"));
 381
 382         NULLERROR(surf_b_game = load_image("banners/game.png"));
 383         NULLERROR(surf_b_over = load_image("banners/over.png"));
 384
 385         // Load the life indicator (small ship) graphic.
 386         NULLERROR(surf_life = load_image("indicators/life.png"));
 387
 388         // Load the font image
 389         s = add_data_path(BIG_FONT_FILE);
 390         if(s) {
 391                 NULLERROR(surf_font_big = IMG_Load(s));
 392                 free(s);
 393                 g_font = SFont_InitFont(surf_font_big);
 394         }
 395
 396         init_engine_dots();
 397         init_dust();
 398
 399         init_sprites();
 400         add_sprite(SPRITE(&ship));
 401
 402         // Remove the mouse cursor
 403 #ifdef SDL_DISABLE
 404         SDL_ShowCursor(SDL_DISABLE);
 405 #endif
 406
 407         return 0;
 408 }
 409
 410 void
 411 show_lives(void)
 412 {
 413         int i;
 414         SDL_Rect dest;
 415
 416         for(i=0; i<ship.lives-1; i++) {
 417                 dest.x = (i + 1)*(surf_life->w + 10);
 418                 dest.y = 20;
 419                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 420         }
 421 }
 422
 423 void
 424 draw_game_over(void)
 425 {
 426         float a_game = 0, a_over = 0;
 427         SDL_Rect dest;
 428
 429         // fade in "GAME", then "OVER".
 430         a_game = min(1.0, faderate*fadetimer/3.0);
 431         if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 432
 433         fadetimer += t_frame;
 434
 435         dest.x = (XSIZE-surf_b_game->w)/2;
 436         dest.y = (YSIZE-surf_b_game->h)/2-40;
 437         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 438         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 439
 440         dest.x = (XSIZE-surf_b_over->w)/2;
 441         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 442         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 443         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 444 }
 445
 446 void
 447 draw_title_page(void)
 448 {
 449         int x;
 450         char *text;
 451         SDL_Rect dest;
 452
 453         fadetimer += t_frame/2.0;
 454
 455         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 456         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 457         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 458         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 459
 460         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 461         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 462         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 463         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 464
 465         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 466         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 467         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 468         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 469
 470         text = "Version " VERSION;
 471         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 472         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 473
 474         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 475         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 476         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 477 }
 478
 479 void
 480 draw(void) {
 481
 482         SDL_FillRect(surf_screen,NULL,0);  // black background
 483         drawdots(surf_screen);             // background dots
 484         draw_sprite(SPRITE(&ship));
 485         draw_rocks();
 486
 487         show_lives();
 488         show_score();
 489
 490         // If it's game over, show the game over graphic in the dead centre
 491         switch (state) {
 492                 case GAME_OVER: draw_game_over(); break;
 493
 494                 case TITLE_PAGE: draw_title_page(); break;
 495
 496                 case HIGH_SCORE_ENTRY:
 497                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 498                         if(!process_score_input()) {  // done inputting name
 499
 500                                 // Change state to briefly show high scores page
 501                                 state = HIGH_SCORE_DISPLAY;
 502                                 state_timeout = 200;
 503
 504                                 // Write the high score table to the file
 505                                 write_high_score_table();
 506
 507                                 play_tune(TUNE_TITLE_PAGE);
 508                         }
 509                 // FALL THROUGH TO
 510                 case HIGH_SCORE_DISPLAY:
 511                         // Display de list o high scores mon.
 512                         display_scores(surf_screen, 150,50);
 513                         break;
 514                 case GAMEPLAY:
 515                 case DEAD_PAUSE:
 516                         ; // no action necessary
 517         }
 518
 519         collisions();
 520
 521         ms_frame = SDL_GetTicks() - ms_end;
 522         ms_end += ms_frame;
 523         t_frame = opt_gamespeed * ms_frame / 50;
 524         if(state == GAMEPLAY) score += ms_frame;
 525
 526         // Update the surface
 527         SDL_Flip(surf_screen);
 528 }
 529
 530 static inline void
 531 kill_ship(Sprite *ship)
 532 {
 533         ship->flags = MOVE;
 534         // ship->flags = MOVE|DRAW;  // FADE SHIP
 535         // SDL_SetAlpha(ship->image, SDL_SRCALPHA, 0); // FADE SHIP
 536         bang = true;
 537 }
 538
 539 void
 540 do_collision(Sprite *a, Sprite *b)
 541 {
 542         if(a->type == SHIP) kill_ship(a);
 543         else if (b->type == SHIP) kill_ship(b);
 544         else bounce(a, b);
 545 }
 546
 547 void
 548 init_score_entry(void)
 549 {
 550         SDL_Event e;
 551         state = HIGH_SCORE_ENTRY;
 552         state_timeout = 5.0e6;
 553         SDL_EnableUNICODE(1);
 554         while(SDL_PollEvent(&e))
 555                 ;
 556 }
 557
 558 void
 559 gameloop() {
 560         Uint8 *keystate = SDL_GetKeyState(NULL);
 561         float tmp;
 562
 563
 564         for(;;) {
 565                 SDL_PumpEvents();
 566                 keystate = SDL_GetKeyState(NULL);
 567
 568                 if(!paused) {
 569                         // Count down the game loop timer, and change state when it gets to zero or less;
 570
 571                         if((state_timeout -= t_frame*3) < 0) {
 572                                 switch(state) {
 573                                         case DEAD_PAUSE:
 574                                                 // Restore the ship and continue playing
 575                                                 ship.flags = DRAW|MOVE|COLLIDE;
 576                                                 state = GAMEPLAY;
 577                                                 play_tune(TUNE_GAMEPLAY);
 578                                                 break;
 579                                         case GAME_OVER:
 580                                                 if(new_high_score(score)) init_score_entry();
 581                                                 else {
 582                                                         state = HIGH_SCORE_DISPLAY;
 583                                                         state_timeout = 400;
 584                                                 }
 585                                                 break;
 586                                         case HIGH_SCORE_DISPLAY:
 587                                                 state = TITLE_PAGE;
 588                                                 state_timeout = 500.0;
 589                                                 break;
 590                                         case HIGH_SCORE_ENTRY:
 591                                                 break;
 592                                         case TITLE_PAGE:
 593                                                 state = HIGH_SCORE_DISPLAY;
 594                                                 state_timeout = 200.0;
 595                                                 break;
 596                                         case GAMEPLAY:
 597                                                 ; // no action necessary
 598                                 }
 599                         } else {
 600                                 if(state == DEAD_PAUSE) {
 601                                         float blast_radius;
 602                                         // float alpha;  // FADE SHIP
 603                                         if(state_timeout >= DEAD_PAUSE_LENGTH - 20.0) {
 604                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 605                                                 blast_rocks(bangx, bangy, blast_radius);
 606                                         }
 607
 608                                         if(bangx < 60) bangx = 60;
 609
 610                                         // FADE SHIP
 611                                         // alpha = 255.0 * (DEAD_PAUSE_LENGTH - state_timeout) / DEAD_PAUSE_LENGTH;
 612                                         // SDL_SetAlpha(ship.image, SDL_SRCALPHA, (uint8_t)alpha);
 613                                 }
 614                         }
 615
 616                         new_rocks();
 617
 618                         // SCROLLING
 619                         tmp = (ship.y+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
 620                         screendy += tmp * t_frame/12;
 621                         tmp = (ship.x+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
 622                         screendx += tmp * t_frame/12;
 623                         // taper off so we don't hit the barrier abruptly.
 624                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 625                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
 626                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 627                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 628                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 629
 630                         // move bang center
 631                         bangx += (bangdx - screendx)*t_frame;
 632                         bangy += (bangdy - screendy)*t_frame;
 633
 634                         move_sprites();
 635
 636
 637                         // BOUNCE off left or right edge of screen
 638                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 639                                 ship.x -= (ship.dx-screendx)*t_frame;
 640                                 ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
 641                         }
 642
 643                         // BOUNCE off top or bottom of screen
 644                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 645                                 ship.y -= (ship.dy-screendy)*t_frame;
 646                                 ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
 647                         }
 648
 649                         draw();
 650
 651                         if(state == GAMEPLAY && bang) {
 652                                 // Died
 653                                 bang = false;
 654                                 play_sound(SOUND_BANG); // Play the explosion sound
 655                                 bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
 656                                 new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
 657
 658                                 if(--ship.lives) {
 659                                         state = DEAD_PAUSE;
 660                                         state_timeout = DEAD_PAUSE_LENGTH;
 661                                         ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
 662                                         ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
 663                                         if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
 664                                 } else {
 665                                         state = GAME_OVER;
 666                                         ship.dx = SCREENDXMIN; ship.dy = 0;
 667                                         state_timeout = 200.0;
 668                                         fadetimer = 0.0;
 669                                         faderate = t_frame;
 670                                 }
 671                         }
 672
 673                         // new game
 674                         if(keystate[SDLK_SPACE]
 675                            && (state == HIGH_SCORE_DISPLAY
 676                                || state == TITLE_PAGE
 677                                || state == GAME_OVER)) {
 678                                 if(state == GAME_OVER && new_high_score(score))
 679                                         init_score_entry();
 680                                 else {
 681                                         reset_sprites();
 682                                         reset_rocks();
 683                                         screendx = SCREENDXMIN; screendy = 0;
 684
 685                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2;
 686                                         ship.dx = screendx; ship.dy = screendy;
 687                                         ship.lives = 4;
 688                                         ship.flags = MOVE|DRAW|COLLIDE;
 689                                         // SDL_SetAlpha(ship.image, SDL_SRCALPHA, SDL_ALPHA_OPAQUE);  // FADE SHIP
 690                                         add_sprite(SPRITE(&ship));
 691
 692                                         score = 0;
 693
 694                                         state = GAMEPLAY;
 695                                         play_tune(TUNE_GAMEPLAY);
 696                                 }
 697                         }
 698
 699                         ship.jets = 0;
 700                 }
 701
 702                 if(state == GAMEPLAY) {
 703                         if(!paused) {
 704                                 if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { ship.dx -= 1.5*t_frame; ship.jets |= 1<<0;}
 705                                 if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { ship.dy += 1.5*t_frame; ship.jets |= 1<<1;}
 706                                 if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { ship.dx += 1.5*t_frame; ship.jets |= 1<<2;}
 707                                 if(keystate[SDLK_UP]    | keystate[SDLK_c]) { ship.dy -= 1.5*t_frame; ship.jets |= 1<<3;}
 708                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 709                         }
 710
 711                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 712                                 if(!pausedown) {
 713                                         paused = !paused;
 714                                         pausedown = 1;
 715                                         if(!paused) ms_end = SDL_GetTicks();
 716                                 }
 717                         } else {
 718                                 pausedown = 0;
 719                         }
 720                 }
 721
 722                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE]))
 723                         return;
 724
 725         }
 726 }
 727
 728 int
 729 main(int argc, char **argv) {
 730         init_opts();
 731         argp_parse(&argp, argc, argv, 0, 0, 0);
 732
 733         if(init()) {
 734                 printf ("ta: '%s'\n",initerror);
 735                 return 1;
 736         }
 737
 738         gameloop();
 739
 740         return 0;
 741 }