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 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*opt_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(int xbang, int ybang, int dx, int dy, SDL_Surface *s)
 137 {
 138         int x,y,endcount;
 139         uint16_t *pixel,c;
 140         uint32_t colorkey;
 141         int row_inc;
 142         double theta,r;
 143         int begin_generate;
 144
 145         begin_generate = SDL_GetTicks();
 146         pixel = s->pixels;
 147         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 148         colorkey = s->format->colorkey;
 149
 150         SDL_LockSurface(s);
 151
 152         endcount = 0;
 153         while (endcount<3) {
 154                 pixel = s->pixels;
 155                 for(y=0; y<s->h; y++) {
 156                         for(x = 0; x<s->w; x++) {
 157                                 c = *pixel++;
 158                                 if(c && c != colorkey) {
 159                                         theta = frnd()*M_PI*2;
 160                                         r = frnd(); r = 1 - r*r;
 161                                         // r = 1 - frnd()*frnd();
 162
 163                                         bdot[bd2].dx = 45*r*cos(theta) + dx;
 164                                         bdot[bd2].dy = 45*r*sin(theta) + dy;
 165                                         bdot[bd2].x = x + xbang;
 166                                         bdot[bd2].y = y + ybang;
 167                                         bdot[bd2].c = 0;
 168                                         bdot[bd2].life = 100;
 169                                         bdot[bd2].decay = frnd()*3 + 1;
 170                                         bdot[bd2].active = 1;
 171
 172                                         // Replace the last few bang dots with the pixels from the exploding object
 173                                         if(endcount>0) bdot[bd2].c = c;
 174
 175                                         bd2 = (bd2+1) % MAXBANGDOTS;
 176                                 }
 177                                 pixel += row_inc;
 178                         }
 179                 }
 180                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 181         }
 182
 183         SDL_UnlockSurface(s);
 184 }
 185
 186 void
 187 draw_bang_dots(SDL_Surface *s)
 188 {
 189         int i;
 190         int first_i, last_i;
 191         uint16_t *pixels, *pixel, c;
 192         int row_inc = s->pitch/sizeof(uint16_t);
 193         Sprite *hit;
 194
 195         pixels = (uint16_t *) s->pixels;
 196         first_i = -1;
 197         last_i = 0;
 198
 199         for(i=0; i<MAXBANGDOTS; i++) {
 200                 if(!bdot[i].active) continue;
 201
 202                 // decrement life and maybe kill
 203                 bdot[i].life -= bdot[i].decay;
 204                 if(bdot[i].life<0) { bdot[i].active = 0; continue; }
 205
 206                 // move and clip
 207                 bdot[i].x += (bdot[i].dx - screendx)*t_frame;
 208                 bdot[i].y += (bdot[i].dy - screendy)*t_frame;
 209                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 210                         bdot[i].active = 0;
 211                         continue;
 212                 }
 213
 214                 // check collisions
 215                 if((hit = pixel_collides(bdot[i].x, bdot[i].y))) {
 216                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 217                                 bdot[i].active = 0;
 218                                 hit->dx += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dx / sprite_mass(hit);
 219                                 hit->dy += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dy / sprite_mass(hit);
 220                                 continue;
 221                         }
 222                 }
 223
 224                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 225                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 226                 *pixel = c;
 227         }
 228 }
 229
 230
 231 void
 232 new_engine_dots(int n, int dir) {
 233         int i;
 234         float a, r;  // angle, random length
 235         float dx, dy;
 236         float hx, hy; // half ship width/height.
 237         static const int s[4] = { 2, 1, 0, 1 };
 238
 239         hx = ship.image->w / 2;
 240         hy = ship.image->h / 2;
 241
 242         for(i = 0; i<n; i++) {
 243                 if(dotptr->active == 0) {
 244                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 245                         r = sin(frnd()*M_PI);
 246                         dx = r * cos(a);
 247                         dy = r * -sin(a);  // screen y is "backwards".
 248
 249                         dotptr->active = 1;
 250                         dotptr->x = ship.x + s[dir]*hx + (frnd()-0.5)*3;
 251                         dotptr->y = ship.y + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 252                         if(dir&1) {
 253                                 dotptr->dx = ship.dx + 2*dx;
 254                                 dotptr->dy = ship.dy + 20*dy;
 255                                 dotptr->life = 60 * fabs(dy);
 256                         } else {
 257                                 dotptr->dx = ship.dx + 20*dx;
 258                                 dotptr->dy = ship.dy + 2*dy;
 259                                 dotptr->life = 60 * fabs(dx);
 260                         }
 261
 262                         if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 263                         else dotptr = edot;
 264                 }
 265         }
 266 }
 267
 268 void
 269 draw_engine_dots(SDL_Surface *s) {
 270         int i;
 271         uint16_t c;
 272         uint16_t *pixels = (uint16_t *) s->pixels;
 273         int row_inc = s->pitch/sizeof(uint16_t);
 274         int heatindex;
 275         Sprite *hit;
 276
 277         for(i = 0; i<MAXENGINEDOTS; i++) {
 278                 if(!edot[i].active) continue;
 279                 edot[i].x += (edot[i].dx - screendx)*t_frame;
 280                 edot[i].y += (edot[i].dy - screendy)*t_frame;
 281                 edot[i].life -= t_frame*3;
 282                 if(edot[i].life < 0
 283                                 || edot[i].x<0 || edot[i].x >= XSIZE
 284                                 || edot[i].y<0 || edot[i].y >= YSIZE) {
 285                         edot[i].active = 0;
 286                         continue;
 287                 }
 288                 // check collisions
 289                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 290                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 291                                 edot[i].active = 0;
 292                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 293                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 294                                 continue;
 295                         }
 296                 }
 297                 heatindex = edot[i].life * 6;
 298                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 299                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 300         }
 301 }
 302
 303 void
 304 drawdots(SDL_Surface *s) {
 305         int m;
 306
 307         // Create engine dots out the side we're moving from
 308         for(m = 0; m<4; m++) {
 309                 if(ship.jets & 1<<m) { // 'jets' is a bit field
 310                         new_engine_dots(80,m);
 311                 }
 312         }
 313
 314         move_dust();
 315
 316         SDL_LockSurface(s);
 317         draw_dust(s);
 318         draw_engine_dots(s);
 319         draw_bang_dots(s);
 320         SDL_UnlockSurface(s);
 321 }
 322
 323 SDL_Surface *
 324 load_image(char *filename)
 325 {
 326         SDL_Surface *tmp, *img = NULL;
 327         char *s = add_data_path(filename);
 328         if(s) {
 329                 tmp = IMG_Load(s);
 330                 free(s);
 331                 if(tmp) {
 332                         img = SDL_DisplayFormat(tmp);
 333                         SDL_FreeSurface(tmp);
 334                 }
 335         }
 336         return img;
 337 }
 338
 339 void
 340 load_ship(void)
 341 {
 342         load_sprite(SPRITE(&ship), "ship.png");
 343 }
 344
 345 int
 346 init(void) {
 347
 348         int i;
 349         char *s;
 350         Uint32 flag;
 351
 352         // Where are our data files?
 353         if(!find_files()) exit(1);
 354         read_high_score_table();
 355
 356         if(opt_sound) {
 357                 // Initialize SDL with audio and video
 358                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 359                         opt_sound = 0;
 360                         fputs("Can't open sound, starting without it\n", stderr);
 361                         atexit(SDL_Quit);
 362                 } else {
 363                         atexit(SDL_Quit);
 364                         atexit(SDL_CloseAudio);
 365                         opt_sound = init_sound();
 366                 }
 367         } else {
 368                 // Initialize with video only
 369                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 370                 atexit(SDL_Quit);
 371         }
 372
 373         play_tune(TUNE_TITLE_PAGE);
 374
 375         // Attempt to get the required video size
 376         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 377         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 378         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 379
 380         // Set the title bar text
 381         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 382
 383         NULLERROR(surf_screen);
 384
 385         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 386         for(i = 0; i<W*3; i++) {
 387                 heatcolor[i] = SDL_MapRGB(
 388                         surf_screen->format,
 389                         (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?
 390                 );
 391         }
 392
 393         // Load the banners
 394         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 395         NULLERROR(surf_b_on = load_image("b_on.png"));
 396         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 397
 398         NULLERROR(surf_b_game = load_image("b_game.png"));
 399         NULLERROR(surf_b_over = load_image("b_over.png"));
 400
 401         // Load the life indicator (small ship) graphic.
 402         NULLERROR(surf_life = load_image("life.png"));
 403
 404         // Load the font image
 405         s = add_data_path("font.png");
 406         if(s) {
 407                 NULLERROR(surf_font_big = IMG_Load(s));
 408                 free(s);
 409                 g_font = SFont_InitFont(surf_font_big);
 410         }
 411
 412         init_engine_dots();
 413         init_dust();
 414
 415         init_sprites();
 416         add_sprite(SPRITE(&ship));
 417
 418         // Remove the mouse cursor
 419 #ifdef SDL_DISABLE
 420         SDL_ShowCursor(SDL_DISABLE);
 421 #endif
 422
 423         return 0;
 424 }
 425
 426 void
 427 show_lives(void)
 428 {
 429         int i;
 430         SDL_Rect dest;
 431
 432         for(i=0; i<ship.lives-1; i++) {
 433                 dest.x = (i + 1)*(surf_life->w + 10);
 434                 dest.y = 20;
 435                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 436         }
 437 }
 438
 439 void
 440 draw_game_over(void)
 441 {
 442         int x;
 443         char *text0, *text1;
 444         SDL_Rect dest;
 445         float a_game = 0, a_over = 0;
 446
 447         // fade in "GAME", then "OVER".
 448         a_game = min(1.0, faderate*fadetimer/3.0);
 449         if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 450
 451         fadetimer += t_frame;
 452
 453         dest.x = (XSIZE-surf_b_game->w)/2;
 454         dest.y = (YSIZE-surf_b_game->h)/2-40;
 455         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 456         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 457
 458         dest.x = (XSIZE-surf_b_over->w)/2;
 459         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 460         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 461         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 462
 463         if(new_high_score(score)) {
 464                 text0 = "New High Score!";
 465                 text1 = "Press SPACE to continue";
 466         } else {
 467                 text0 = msgs[g_easy][0];
 468                 text1 = msgs[g_easy][1];
 469         }
 470
 471         x = (XSIZE-SFont_TextWidth(g_font,text0))/2 + cos(fadetimer/9)*10;
 472         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 473
 474         x = (XSIZE-SFont_TextWidth(g_font,text1))/2 + sin(fadetimer/9)*10;
 475         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 476 }
 477
 478 void
 479 draw_title_page(void)
 480 {
 481         int x;
 482         char *text;
 483         SDL_Rect dest;
 484
 485         fadetimer += t_frame/2.0;
 486
 487         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 488         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 489         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 490         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 491
 492         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 493         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 494         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 495         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 496
 497         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 498         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 499         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 500         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 501
 502         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 503         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 504         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 505
 506         text = "Version " VERSION;
 507         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 508         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 509 }
 510
 511 void
 512 draw(void) {
 513
 514         SDL_FillRect(surf_screen,NULL,0);  // black background
 515         drawdots(surf_screen);             // background dots
 516         draw_sprite(SPRITE(&ship));
 517         draw_rocks();
 518
 519         show_lives();
 520         show_score();
 521
 522         // If it's game over, show the game over graphic in the dead centre
 523         switch (state) {
 524                 case GAME_OVER: draw_game_over(); break;
 525
 526                 case TITLE_PAGE: draw_title_page(); break;
 527
 528                 case HIGH_SCORE_ENTRY:
 529                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 530                         if(!process_score_input()) {  // done inputting name
 531
 532                                 // Change state to briefly show high scores page
 533                                 state = HIGH_SCORE_DISPLAY;
 534                                 state_timeout = 200;
 535
 536                                 // Write the high score table to the file
 537                                 write_high_score_table();
 538
 539                                 play_tune(TUNE_TITLE_PAGE);
 540                         }
 541                 // FALL THROUGH TO
 542                 case HIGH_SCORE_DISPLAY:
 543                         // Display de list o high scores mon.
 544                         display_scores(surf_screen, 150,50);
 545                         break;
 546                 case GAMEPLAY:
 547                 case DEAD_PAUSE:
 548                         ; // no action necessary
 549         }
 550
 551         collisions();
 552
 553         ms_frame = SDL_GetTicks() - ms_end;
 554         ms_end += ms_frame;
 555         t_frame = opt_gamespeed * ms_frame / 50;
 556         if(state == GAMEPLAY) score += ms_frame;
 557
 558         // Update the surface
 559         SDL_Flip(surf_screen);
 560 }
 561
 562 static inline void
 563 kill_ship(Sprite *ship)
 564 {
 565         ship->flags = MOVE;
 566         bang = true;
 567 }
 568
 569 void
 570 do_collision(Sprite *a, Sprite *b)
 571 {
 572         if(a->type == SHIP) kill_ship(a);
 573         else if (b->type == SHIP) kill_ship(b);
 574         else bounce(a, b);
 575 }
 576
 577 void
 578 init_score_entry(void)
 579 {
 580         SDL_Event e;
 581         state = HIGH_SCORE_ENTRY;
 582         state_timeout = 5.0e6;
 583         SDL_EnableUNICODE(1);
 584         while(SDL_PollEvent(&e))
 585                 ;
 586         insert_score(score);
 587 }
 588
 589 void
 590 gameloop() {
 591         Uint8 *keystate = SDL_GetKeyState(NULL);
 592         float tmp;
 593
 594
 595         for(;;) {
 596                 SDL_PumpEvents();
 597                 keystate = SDL_GetKeyState(NULL);
 598
 599                 if(!paused) {
 600                         // Count down the game loop timer, and change state when it gets to zero or less;
 601
 602                         if((state_timeout -= t_frame*3) < 0) {
 603                                 switch(state) {
 604                                         case DEAD_PAUSE:
 605                                                 // Restore the ship and continue playing
 606                                                 ship.flags = DRAW|MOVE|COLLIDE;
 607                                                 state = GAMEPLAY;
 608                                                 play_tune(TUNE_GAMEPLAY);
 609                                                 break;
 610                                         case GAME_OVER:
 611                                                 if(new_high_score(score)) init_score_entry();
 612                                                 else {
 613                                                         state = HIGH_SCORE_DISPLAY;
 614                                                         state_timeout = 400;
 615                                                 }
 616                                                 break;
 617                                         case HIGH_SCORE_DISPLAY:
 618                                                 state = TITLE_PAGE;
 619                                                 state_timeout = 600.0;
 620                                                 fadetimer = 0.0;
 621                                                 break;
 622                                         case HIGH_SCORE_ENTRY:
 623                                                 break;
 624                                         case TITLE_PAGE:
 625                                                 state = HIGH_SCORE_DISPLAY;
 626                                                 state_timeout = 200.0;
 627                                                 break;
 628                                         case GAMEPLAY:
 629                                                 ; // no action necessary
 630                                 }
 631                         } else {
 632                                 if(state == DEAD_PAUSE) {
 633                                         if(bangx < 60) bangx = 60;
 634                                 }
 635                         }
 636
 637                         new_rocks();
 638
 639                         // SCROLLING
 640                         tmp = (ship.y+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
 641                         screendy += tmp * t_frame/12;
 642                         tmp = (ship.x+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
 643                         screendx += tmp * t_frame/12;
 644                         // taper off so we don't hit the barrier abruptly.
 645                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 646                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
 647                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 648                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 649                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 650
 651                         // move bang center
 652                         bangx += (bangdx - screendx)*t_frame;
 653                         bangy += (bangdy - screendy)*t_frame;
 654
 655                         move_sprites();
 656
 657
 658                         // BOUNCE off left or right edge of screen
 659                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 660                                 ship.x -= (ship.dx-screendx)*t_frame;
 661                                 ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
 662                         }
 663
 664                         // BOUNCE off top or bottom of screen
 665                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 666                                 ship.y -= (ship.dy-screendy)*t_frame;
 667                                 ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
 668                         }
 669
 670                         draw();
 671
 672                         if(state == GAMEPLAY && bang) {
 673                                 // Died
 674                                 bang = false;
 675                                 play_sound(SOUND_BANG); // Play the explosion sound
 676                                 bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
 677                                 new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
 678
 679                                 if(--ship.lives) {
 680                                         state = DEAD_PAUSE;
 681                                         state_timeout = DEAD_PAUSE_LENGTH;
 682                                         ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
 683                                         ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
 684                                         if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
 685                                 } else {
 686                                         state = GAME_OVER;
 687                                         ship.dx = SCREENDXMIN; ship.dy = 0;
 688                                         state_timeout = 200.0;
 689                                         fadetimer = 0.0;
 690                                         faderate = t_frame;
 691                                 }
 692                         }
 693
 694                         // new game
 695                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 696                            && (state == HIGH_SCORE_DISPLAY
 697                                || state == TITLE_PAGE
 698                                || state == GAME_OVER)) {
 699                                 if(state == GAME_OVER && new_high_score(score))
 700                                         init_score_entry();
 701                                 else {
 702                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 703                                                 g_easy = 0;
 704                                                 initial_rocks = NORMAL_I_ROCKS;
 705                                                 final_rocks = NORMAL_F_ROCKS;
 706                                                 if(opt_gamespeed == EASY_GAMESPEED)
 707                                                         opt_gamespeed = NORMAL_GAMESPEED;
 708                                         } else if(keystate[SDLK_1]) {
 709                                                 g_easy = 1;
 710                                                 initial_rocks = EASY_I_ROCKS;
 711                                                 final_rocks = EASY_F_ROCKS;
 712                                                 opt_gamespeed = EASY_GAMESPEED;
 713                                         }
 714                                         reset_sprites();
 715                                         reset_rocks();
 716                                         screendx = SCREENDXMIN; screendy = 0;
 717
 718                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2;
 719                                         ship.dx = screendx; ship.dy = screendy;
 720                                         ship.lives = 4;
 721                                         ship.flags = MOVE|DRAW|COLLIDE;
 722                                         add_sprite(SPRITE(&ship));
 723
 724                                         score = 0;
 725
 726                                         state = GAMEPLAY;
 727                                         play_tune(TUNE_GAMEPLAY);
 728                                 }
 729                         }
 730
 731                         ship.jets = 0;
 732                 }
 733
 734                 if(state == GAMEPLAY) {
 735                         if(!paused) {
 736                                 if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { ship.dx -= 1.5*t_frame; ship.jets |= 1<<0;}
 737                                 if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { ship.dy += 1.5*t_frame; ship.jets |= 1<<1;}
 738                                 if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { ship.dx += 1.5*t_frame; ship.jets |= 1<<2;}
 739                                 if(keystate[SDLK_UP]    | keystate[SDLK_c]) { ship.dy -= 1.5*t_frame; ship.jets |= 1<<3;}
 740                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 741                         }
 742
 743                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 744                                 if(!pausedown) {
 745                                         paused = !paused;
 746                                         pausedown = 1;
 747                                         if(!paused) ms_end = SDL_GetTicks();
 748                                 }
 749                         } else {
 750                                 pausedown = 0;
 751                         }
 752                 }
 753
 754                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 755                         state = HIGH_SCORE_DISPLAY;
 756                         state_timeout = 400;
 757                 }
 758
 759                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE]))
 760                         return;
 761
 762         }
 763 }
 764
 765 int
 766 main(int argc, char **argv) {
 767         init_opts();
 768         argp_parse(&argp, argc, argv, 0, 0, 0);
 769
 770         if(init()) {
 771                 printf ("ta: '%s'\n",initerror);
 772                 return 1;
 773         }
 774
 775         gameloop();
 776
 777         return 0;
 778 }