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 #ifndef WIN32
  23 # include <argp.h>
  24 #endif
  25 #include <math.h>
  26 #include <SDL.h>
  27 #include <SDL_image.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include "SFont.h"
  34
  35 #include "args.h"
  36 #include "common.h"
  37 #include "config.h"
  38 #include "dust.h"
  39 #include "file.h"
  40 #include "globals.h"
  41 #include "mt.h"
  42 #include "rocks.h"
  43 #include "score.h"
  44 #include "sprite.h"
  45 #include "sound.h"
  46
  47 // ************************************* VARS
  48 // SDL_Surface global variables
  49 SDL_Surface
  50         *surf_screen,   // Screen
  51         *surf_b_variations, // "variations" banner
  52         *surf_b_on, // "on" banner
  53         *surf_b_rockdodger, // "rockdodger" banner
  54         *surf_b_game,   // Title element "game"
  55         *surf_b_over,   // Title element "over"
  56         *surf_life,     // Indicator of number of ships remaining
  57         *surf_rock[NROCKS],     // THE ROCKS
  58         *surf_font_big; // The big font
  59
  60
  61 SFont_Font *g_font;
  62
  63 // Structure global variables
  64 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
  65 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
  66
  67 // Other global variables
  68 char topline[1024];
  69 char *initerror = "";
  70
  71 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, SCREENDXMIN, 0.0 };
  72
  73 float screendx = SCREENDXMIN, screendy = 0.0;
  74 float back_dist;
  75
  76 // all movement is based on t_frame.
  77 float t_frame;  // length of this frame (in ticks = 1/20th second)
  78 int ms_frame;   // length of this frame (milliseconds)
  79 int ms_end;     // end of this frame (milliseconds)
  80
  81 int bang = false;
  82 float bangx, bangy, bangdx, bangdy;
  83
  84 int score;
  85
  86 float fadetimer = 0, faderate;
  87
  88 int pausedown = 0, paused = 0;
  89
  90 // bangdot start (bd1) and end (bd2) position:
  91 int bd1 = 0, bd2 = 0;
  92
  93 enum states {
  94         TITLE_PAGE,
  95         GAMEPLAY,
  96         DEAD_PAUSE,
  97         GAME_OVER,
  98         HIGH_SCORE_ENTRY,
  99         HIGH_SCORE_DISPLAY
 100 };
 101 enum states state = TITLE_PAGE;
 102 float state_timeout = 600.0;
 103
 104 #define NSEQUENCE 3
 105 char *msgs[2][3] = {
 106         {
 107                 "Press SPACE for normal game",
 108                 "Press '1' for easy game",
 109                 "http://jasonwoof.org/vor"
 110         },
 111         {
 112                 "Press SPACE for easy game",
 113                 "Press '2' for normal game",
 114                 "http://jasonwoof.org/vor"
 115         }
 116 };
 117
 118 int bangdotlife, nbangdots;
 119 Uint16 heatcolor[W*3];
 120
 121 char *data_dir;
 122 extern char *optarg;
 123 extern int optind, opterr, optopt;
 124
 125 #define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
 126
 127 // ************************************* FUNCS
 128
 129 void
 130 init_engine_dots() {
 131         int i;
 132         for(i = 0; i<MAXENGINEDOTS; i++) {
 133                 edot[i].active = 0;
 134         }
 135 }
 136
 137 void
 138 new_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s)
 139 {
 140         int x,y,endcount;
 141         uint16_t *pixel,c;
 142         uint32_t colorkey;
 143         int row_inc;
 144         double theta,r;
 145         int begin_generate;
 146
 147         begin_generate = SDL_GetTicks();
 148         pixel = s->pixels;
 149         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 150         colorkey = s->format->colorkey;
 151
 152         SDL_LockSurface(s);
 153
 154         endcount = 0;
 155         while (endcount<3) {
 156                 pixel = s->pixels;
 157                 for(y=0; y<s->h; y++) {
 158                         for(x = 0; x<s->w; x++) {
 159                                 c = *pixel++;
 160                                 if(c && c != colorkey) {
 161                                         theta = frnd()*M_PI*2;
 162                                         r = frnd(); r = 1 - r*r;
 163                                         // r = 1 - frnd()*frnd();
 164
 165                                         bdot[bd2].dx = 45*r*cos(theta) + dx;
 166                                         bdot[bd2].dy = 45*r*sin(theta) + dy;
 167                                         bdot[bd2].x = x + xbang;
 168                                         bdot[bd2].y = y + ybang;
 169                                         bdot[bd2].c = 0;
 170                                         bdot[bd2].life = 100;
 171                                         bdot[bd2].decay = frnd()*3 + 1;
 172                                         bdot[bd2].active = 1;
 173
 174                                         // Replace the last few bang dots with the pixels from the exploding object
 175                                         if(endcount>0) bdot[bd2].c = c;
 176
 177                                         bd2 = (bd2+1) % MAXBANGDOTS;
 178                                 }
 179                                 pixel += row_inc;
 180                         }
 181                 }
 182                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 183         }
 184
 185         SDL_UnlockSurface(s);
 186 }
 187
 188 void
 189 draw_bang_dots(SDL_Surface *s)
 190 {
 191         int i;
 192         int first_i, last_i;
 193         uint16_t *pixels, *pixel, c;
 194         int row_inc = s->pitch/sizeof(uint16_t);
 195         Sprite *hit;
 196
 197         pixels = (uint16_t *) s->pixels;
 198         first_i = -1;
 199         last_i = 0;
 200
 201         for(i=0; i<MAXBANGDOTS; i++) {
 202                 if(!bdot[i].active) continue;
 203
 204                 // decrement life and maybe kill
 205                 bdot[i].life -= bdot[i].decay;
 206                 if(bdot[i].life<0) { bdot[i].active = 0; continue; }
 207
 208                 // move and clip
 209                 bdot[i].x += (bdot[i].dx - screendx)*t_frame;
 210                 bdot[i].y += (bdot[i].dy - screendy)*t_frame;
 211                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 212                         bdot[i].active = 0;
 213                         continue;
 214                 }
 215
 216                 // check collisions
 217                 if((hit = pixel_collides(bdot[i].x, bdot[i].y))) {
 218                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 219                                 bdot[i].active = 0;
 220                                 hit->dx += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dx / sprite_mass(hit);
 221                                 hit->dy += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dy / sprite_mass(hit);
 222                                 continue;
 223                         }
 224                 }
 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(int n, int dir) {
 235         int i;
 236         float a, r;  // angle, random length
 237         float dx, dy;
 238         float hx, hy; // half ship width/height.
 239         static const int s[4] = { 2, 1, 0, 1 };
 240
 241         hx = ship.image->w / 2;
 242         hy = ship.image->h / 2;
 243
 244         for(i = 0; i<n; i++) {
 245                 if(dotptr->active == 0) {
 246                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 247                         r = sin(frnd()*M_PI);
 248                         dx = r * cos(a);
 249                         dy = r * -sin(a);  // screen y is "backwards".
 250
 251                         dotptr->active = 1;
 252                         dotptr->x = ship.x + s[dir]*hx + (frnd()-0.5)*3;
 253                         dotptr->y = ship.y + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 254                         if(dir&1) {
 255                                 dotptr->dx = ship.dx + 2*dx;
 256                                 dotptr->dy = ship.dy + 20*dy;
 257                                 dotptr->life = 60 * fabs(dy);
 258                         } else {
 259                                 dotptr->dx = ship.dx + 20*dx;
 260                                 dotptr->dy = ship.dy + 2*dy;
 261                                 dotptr->life = 60 * fabs(dx);
 262                         }
 263
 264                         if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 265                         else dotptr = edot;
 266                 }
 267         }
 268 }
 269
 270 void
 271 draw_engine_dots(SDL_Surface *s) {
 272         int i;
 273         uint16_t c;
 274         uint16_t *pixels = (uint16_t *) s->pixels;
 275         int row_inc = s->pitch/sizeof(uint16_t);
 276         int heatindex;
 277         Sprite *hit;
 278
 279         for(i = 0; i<MAXENGINEDOTS; i++) {
 280                 if(!edot[i].active) continue;
 281                 edot[i].x += (edot[i].dx - screendx)*t_frame;
 282                 edot[i].y += (edot[i].dy - screendy)*t_frame;
 283                 edot[i].life -= t_frame*3;
 284                 if(edot[i].life < 0
 285                                 || edot[i].x<0 || edot[i].x >= XSIZE
 286                                 || edot[i].y<0 || edot[i].y >= YSIZE) {
 287                         edot[i].active = 0;
 288                         continue;
 289                 }
 290                 // check collisions
 291                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 292                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 293                                 edot[i].active = 0;
 294                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 295                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 296                                 continue;
 297                         }
 298                 }
 299                 heatindex = edot[i].life * 6;
 300                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 301                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 302         }
 303 }
 304
 305 void
 306 drawdots(SDL_Surface *s) {
 307         int m;
 308
 309         // Create engine dots out the side we're moving from
 310         for(m = 0; m<4; m++) {
 311                 if(ship.jets & 1<<m) { // 'jets' is a bit field
 312                         new_engine_dots(80,m);
 313                 }
 314         }
 315
 316         move_dust();
 317
 318         SDL_LockSurface(s);
 319         draw_dust(s);
 320         draw_engine_dots(s);
 321         draw_bang_dots(s);
 322         SDL_UnlockSurface(s);
 323 }
 324
 325 SDL_Surface *
 326 load_image(char *filename)
 327 {
 328         SDL_Surface *tmp, *img = NULL;
 329         char *s = add_data_path(filename);
 330         if(s) {
 331                 tmp = IMG_Load(s);
 332                 free(s);
 333                 if(tmp) {
 334                         img = SDL_DisplayFormat(tmp);
 335                         SDL_FreeSurface(tmp);
 336                 }
 337         }
 338         return img;
 339 }
 340
 341 void
 342 load_ship(void)
 343 {
 344         load_sprite(SPRITE(&ship), "ship.png");
 345 }
 346
 347 int
 348 init(void) {
 349
 350         int i;
 351         char *s;
 352         Uint32 flag;
 353
 354         // Where are our data files?
 355         if(!find_files()) exit(1);
 356         read_high_score_table();
 357
 358         if(opt_sound) {
 359                 // Initialize SDL with audio and video
 360                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 361                         opt_sound = 0;
 362                         fputs("Can't open sound, starting without it\n", stderr);
 363                         atexit(SDL_Quit);
 364                 } else {
 365                         atexit(SDL_Quit);
 366                         atexit(SDL_CloseAudio);
 367                         opt_sound = init_sound();
 368                 }
 369         } else {
 370                 // Initialize with video only
 371                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 372                 atexit(SDL_Quit);
 373         }
 374
 375         play_tune(TUNE_TITLE_PAGE);
 376
 377         // Attempt to get the required video size
 378         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 379         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 380         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 381
 382         // Set the title bar text
 383         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 384
 385         NULLERROR(surf_screen);
 386
 387         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 388         for(i = 0; i<W*3; i++) {
 389                 heatcolor[i] = SDL_MapRGB(
 390                         surf_screen->format,
 391                         (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?
 392                 );
 393         }
 394
 395         // Load the banners
 396         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 397         NULLERROR(surf_b_on = load_image("b_on.png"));
 398         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 399
 400         NULLERROR(surf_b_game = load_image("b_game.png"));
 401         NULLERROR(surf_b_over = load_image("b_over.png"));
 402
 403         // Load the life indicator (small ship) graphic.
 404         NULLERROR(surf_life = load_image("life.png"));
 405
 406         // Load the font image
 407         s = add_data_path("font.png");
 408         if(s) {
 409                 NULLERROR(surf_font_big = IMG_Load(s));
 410                 free(s);
 411                 g_font = SFont_InitFont(surf_font_big);
 412         }
 413
 414         init_engine_dots();
 415         init_dust();
 416
 417         init_sprites();
 418         add_sprite(SPRITE(&ship));
 419
 420         // Remove the mouse cursor
 421 #ifdef SDL_DISABLE
 422         SDL_ShowCursor(SDL_DISABLE);
 423 #endif
 424
 425         return 0;
 426 }
 427
 428 void
 429 show_lives(void)
 430 {
 431         int i;
 432         SDL_Rect dest;
 433
 434         for(i=0; i<ship.lives-1; i++) {
 435                 dest.x = (i + 1)*(surf_life->w + 10);
 436                 dest.y = 20;
 437                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 438         }
 439 }
 440
 441 void
 442 draw_game_over(void)
 443 {
 444         int x;
 445         char *text0, *text1;
 446         SDL_Rect dest;
 447         float a_game = 0, a_over = 0;
 448
 449         // fade in "GAME", then "OVER".
 450         a_game = min(1.0, faderate*fadetimer/3.0);
 451         if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 452
 453         fadetimer += t_frame;
 454
 455         dest.x = (XSIZE-surf_b_game->w)/2;
 456         dest.y = (YSIZE-surf_b_game->h)/2-40;
 457         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 458         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 459
 460         dest.x = (XSIZE-surf_b_over->w)/2;
 461         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 462         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 463         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 464
 465         if(new_high_score(score)) {
 466                 text0 = "New High Score!";
 467                 text1 = "Press SPACE to continue";
 468         } else {
 469                 text0 = msgs[g_easy][0];
 470                 text1 = msgs[g_easy][1];
 471         }
 472
 473         x = (XSIZE-SFont_TextWidth(g_font,text0))/2 + cos(fadetimer/9)*10;
 474         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 475
 476         x = (XSIZE-SFont_TextWidth(g_font,text1))/2 + sin(fadetimer/9)*10;
 477         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 478 }
 479
 480 void
 481 draw_title_page(void)
 482 {
 483         int x;
 484         char *text;
 485         SDL_Rect dest;
 486
 487         fadetimer += t_frame/2.0;
 488
 489         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 490         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 491         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 492         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 493
 494         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 495         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 496         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 497         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 498
 499         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 500         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 501         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 502         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 503
 504         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 505         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 506         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 507
 508         text = "Version " VERSION;
 509         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 510         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 511 }
 512
 513 void
 514 draw(void) {
 515
 516         SDL_FillRect(surf_screen,NULL,0);  // black background
 517         drawdots(surf_screen);             // background dots
 518         draw_sprite(SPRITE(&ship));
 519         draw_rocks();
 520
 521         show_lives();
 522         show_score();
 523
 524         // If it's game over, show the game over graphic in the dead centre
 525         switch (state) {
 526                 case GAME_OVER: draw_game_over(); break;
 527
 528                 case TITLE_PAGE: draw_title_page(); break;
 529
 530                 case HIGH_SCORE_ENTRY:
 531                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 532                         if(!process_score_input()) {  // done inputting name
 533
 534                                 // Change state to briefly show high scores page
 535                                 state = HIGH_SCORE_DISPLAY;
 536                                 state_timeout = 200;
 537
 538                                 // Write the high score table to the file
 539                                 write_high_score_table();
 540
 541                                 play_tune(TUNE_TITLE_PAGE);
 542                         }
 543                 // FALL THROUGH TO
 544                 case HIGH_SCORE_DISPLAY:
 545                         // Display de list o high scores mon.
 546                         display_scores(surf_screen, 150,50);
 547                         break;
 548                 case GAMEPLAY:
 549                 case DEAD_PAUSE:
 550                         ; // no action necessary
 551         }
 552
 553         collisions();
 554
 555         ms_frame = SDL_GetTicks() - ms_end;
 556         ms_end += ms_frame;
 557         t_frame = opt_gamespeed * ms_frame / 50;
 558         if(state == GAMEPLAY) score += ms_frame;
 559
 560         // Update the surface
 561         SDL_Flip(surf_screen);
 562 }
 563
 564 static inline void
 565 kill_ship(Sprite *ship)
 566 {
 567         ship->flags = MOVE;
 568         bang = true;
 569 }
 570
 571 void
 572 do_collision(Sprite *a, Sprite *b)
 573 {
 574         if(a->type == SHIP) kill_ship(a);
 575         else if (b->type == SHIP) kill_ship(b);
 576         else bounce(a, b);
 577 }
 578
 579 void
 580 init_score_entry(void)
 581 {
 582         SDL_Event e;
 583         state = HIGH_SCORE_ENTRY;
 584         state_timeout = 5.0e6;
 585         SDL_EnableUNICODE(1);
 586         while(SDL_PollEvent(&e))
 587                 ;
 588         insert_score(score);
 589 }
 590
 591 void
 592 gameloop() {
 593         Uint8 *keystate = SDL_GetKeyState(NULL);
 594         float tmp;
 595
 596
 597         for(;;) {
 598                 SDL_PumpEvents();
 599                 keystate = SDL_GetKeyState(NULL);
 600
 601                 if(!paused) {
 602                         // Count down the game loop timer, and change state when it gets to zero or less;
 603
 604                         if((state_timeout -= t_frame*3) < 0) {
 605                                 switch(state) {
 606                                         case DEAD_PAUSE:
 607                                                 // Restore the ship and continue playing
 608                                                 ship.flags = DRAW|MOVE|COLLIDE;
 609                                                 state = GAMEPLAY;
 610                                                 play_tune(TUNE_GAMEPLAY);
 611                                                 break;
 612                                         case GAME_OVER:
 613                                                 if(new_high_score(score)) init_score_entry();
 614                                                 else {
 615                                                         state = HIGH_SCORE_DISPLAY;
 616                                                         state_timeout = 400;
 617                                                 }
 618                                                 break;
 619                                         case HIGH_SCORE_DISPLAY:
 620                                                 state = TITLE_PAGE;
 621                                                 state_timeout = 600.0;
 622                                                 fadetimer = 0.0;
 623                                                 break;
 624                                         case HIGH_SCORE_ENTRY:
 625                                                 break;
 626                                         case TITLE_PAGE:
 627                                                 state = HIGH_SCORE_DISPLAY;
 628                                                 state_timeout = 200.0;
 629                                                 break;
 630                                         case GAMEPLAY:
 631                                                 ; // no action necessary
 632                                 }
 633                         } else {
 634                                 if(state == DEAD_PAUSE) {
 635                                         if(bangx < 60) bangx = 60;
 636                                 }
 637                         }
 638
 639                         new_rocks();
 640
 641                         // SCROLLING
 642                         tmp = (ship.y+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
 643                         screendy += tmp * t_frame/12;
 644                         tmp = (ship.x+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
 645                         screendx += tmp * t_frame/12;
 646                         // taper off so we don't hit the barrier abruptly.
 647                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 648                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
 649                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 650                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 651                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 652
 653                         // move bang center
 654                         bangx += (bangdx - screendx)*t_frame;
 655                         bangy += (bangdy - screendy)*t_frame;
 656
 657                         move_sprites();
 658
 659
 660                         // BOUNCE off left or right edge of screen
 661                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 662                                 ship.x -= (ship.dx-screendx)*t_frame;
 663                                 ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
 664                         }
 665
 666                         // BOUNCE off top or bottom of screen
 667                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 668                                 ship.y -= (ship.dy-screendy)*t_frame;
 669                                 ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
 670                         }
 671
 672                         draw();
 673
 674                         if(state == GAMEPLAY && bang) {
 675                                 // Died
 676                                 bang = false;
 677                                 play_sound(SOUND_BANG); // Play the explosion sound
 678                                 bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
 679                                 new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
 680
 681                                 if(--ship.lives) {
 682                                         state = DEAD_PAUSE;
 683                                         state_timeout = DEAD_PAUSE_LENGTH;
 684                                         ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
 685                                         ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
 686                                         if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
 687                                 } else {
 688                                         state = GAME_OVER;
 689                                         ship.dx = SCREENDXMIN; ship.dy = 0;
 690                                         state_timeout = 200.0;
 691                                         fadetimer = 0.0;
 692                                         faderate = t_frame;
 693                                 }
 694                         }
 695
 696                         // new game
 697                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 698                            && (state == HIGH_SCORE_DISPLAY
 699                                || state == TITLE_PAGE
 700                                || state == GAME_OVER)) {
 701                                 if(state == GAME_OVER && new_high_score(score))
 702                                         init_score_entry();
 703                                 else {
 704                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 705                                                 g_easy = 0;
 706                                                 initial_rocks = NORMAL_I_ROCKS;
 707                                                 final_rocks = NORMAL_F_ROCKS;
 708                                                 if(opt_gamespeed == EASY_GAMESPEED)
 709                                                         opt_gamespeed = NORMAL_GAMESPEED;
 710                                         } else if(keystate[SDLK_1]) {
 711                                                 g_easy = 1;
 712                                                 initial_rocks = EASY_I_ROCKS;
 713                                                 final_rocks = EASY_F_ROCKS;
 714                                                 opt_gamespeed = EASY_GAMESPEED;
 715                                         }
 716                                         reset_sprites();
 717                                         reset_rocks();
 718                                         screendx = SCREENDXMIN; screendy = 0;
 719
 720                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2;
 721                                         ship.dx = screendx; ship.dy = screendy;
 722                                         ship.lives = 4;
 723                                         ship.flags = MOVE|DRAW|COLLIDE;
 724                                         add_sprite(SPRITE(&ship));
 725
 726                                         score = 0;
 727
 728                                         state = GAMEPLAY;
 729                                         play_tune(TUNE_GAMEPLAY);
 730                                 }
 731                         }
 732
 733                         ship.jets = 0;
 734                 }
 735
 736                 if(state == GAMEPLAY) {
 737                         if(!paused) {
 738                                 if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { ship.dx -= 1.5*t_frame; ship.jets |= 1<<0;}
 739                                 if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { ship.dy += 1.5*t_frame; ship.jets |= 1<<1;}
 740                                 if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { ship.dx += 1.5*t_frame; ship.jets |= 1<<2;}
 741                                 if(keystate[SDLK_UP]    | keystate[SDLK_c]) { ship.dy -= 1.5*t_frame; ship.jets |= 1<<3;}
 742                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 743                         }
 744
 745                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 746                                 if(!pausedown) {
 747                                         paused = !paused;
 748                                         pausedown = 1;
 749                                         if(!paused) ms_end = SDL_GetTicks();
 750                                 }
 751                         } else {
 752                                 pausedown = 0;
 753                         }
 754                 }
 755
 756                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 757                         state = HIGH_SCORE_DISPLAY;
 758                         state_timeout = 400;
 759                 }
 760
 761                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE]))
 762                         return;
 763
 764         }
 765 }
 766
 767 int
 768 main(int argc, char **argv) {
 769         init_opts();
 770 #ifndef WIN32
 771         argp_parse(&argp, argc, argv, 0, 0, 0);
 772 #endif
 773
 774         if(init()) {
 775                 printf ("ta: '%s'\n",initerror);
 776                 return 1;
 777         }
 778
 779         gameloop();
 780
 781         return 0;
 782 }