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 *sequence[] = {
 104         "Press SPACE for normal game",
 105         "Or 'e' for easy game",
 106         "http://jasonwoof.org/vor"
 107 };
 108
 109 int bangdotlife, nbangdots;
 110 Uint16 heatcolor[W*3];
 111
 112 char *data_dir;
 113 extern char *optarg;
 114 extern int optind, opterr, optopt;
 115
 116 #define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
 117
 118 // ************************************* FUNCS
 119
 120 void
 121 init_engine_dots() {
 122         int i;
 123         for(i = 0; i<MAXENGINEDOTS; i++) {
 124                 edot[i].active = 0;
 125         }
 126 }
 127
 128 void
 129 new_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s)
 130 {
 131         int x,y,endcount;
 132         uint16_t *pixel,c;
 133         uint32_t colorkey;
 134         int row_inc;
 135         double theta,r;
 136         int begin_generate;
 137
 138         begin_generate = SDL_GetTicks();
 139         pixel = s->pixels;
 140         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 141         colorkey = s->format->colorkey;
 142
 143         SDL_LockSurface(s);
 144
 145         endcount = 0;
 146         while (endcount<3) {
 147                 pixel = s->pixels;
 148                 for(y=0; y<s->h; y++) {
 149                         for(x = 0; x<s->w; x++) {
 150                                 c = *pixel++;
 151                                 if(c && c != colorkey) {
 152                                         theta = frnd()*M_PI*2;
 153                                         r = frnd(); r = 1 - r*r;
 154                                         // r = 1 - frnd()*frnd();
 155
 156                                         bdot[bd2].dx = 45*r*cos(theta) + dx;
 157                                         bdot[bd2].dy = 45*r*sin(theta) + dy;
 158                                         bdot[bd2].x = x + xbang;
 159                                         bdot[bd2].y = y + ybang;
 160                                         bdot[bd2].c = 0;
 161                                         bdot[bd2].life = 100;
 162                                         bdot[bd2].decay = frnd()*3 + 1;
 163                                         bdot[bd2].active = 1;
 164
 165                                         // Replace the last few bang dots with the pixels from the exploding object
 166                                         if(endcount>0) bdot[bd2].c = c;
 167
 168                                         bd2 = (bd2+1) % MAXBANGDOTS;
 169                                 }
 170                                 pixel += row_inc;
 171                         }
 172                 }
 173                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 174         }
 175
 176         SDL_UnlockSurface(s);
 177 }
 178
 179 void
 180 draw_bang_dots(SDL_Surface *s)
 181 {
 182         int i;
 183         int first_i, last_i;
 184         uint16_t *pixels, *pixel, c;
 185         int row_inc = s->pitch/sizeof(uint16_t);
 186
 187         pixels = (uint16_t *) s->pixels;
 188         first_i = -1;
 189         last_i = 0;
 190
 191         for(i=0; i<MAXBANGDOTS; i++) {
 192                 if(!bdot[i].active) continue;
 193
 194                 // decrement life and maybe kill
 195                 bdot[i].life -= bdot[i].decay;
 196                 if(bdot[i].life<0) { bdot[i].active = 0; continue; }
 197
 198                 // move and clip
 199                 bdot[i].x += (bdot[i].dx - screendx)*t_frame;
 200                 bdot[i].y += (bdot[i].dy - screendy)*t_frame;
 201                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 202                         bdot[i].active = 0;
 203                         continue;
 204                 }
 205
 206                 // check collisions
 207                 if(pixel_collides(bdot[i].x, bdot[i].y)) { bdot[i].active = 0; continue; }
 208
 209                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 210                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 211                 *pixel = c;
 212         }
 213 }
 214
 215
 216 void
 217 new_engine_dots(int n, int dir) {
 218         int i;
 219         float a, r;  // angle, random length
 220         float dx, dy;
 221         float hx, hy; // half ship width/height.
 222         static const int s[4] = { 2, 1, 0, 1 };
 223
 224         hx = ship.image->w / 2;
 225         hy = ship.image->h / 2;
 226
 227         for(i = 0; i<n; i++) {
 228                 if(dotptr->active == 0) {
 229                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 230                         r = sin(frnd()*M_PI);
 231                         dx = r * cos(a);
 232                         dy = r * -sin(a);  // screen y is "backwards".
 233
 234                         dotptr->active = 1;
 235                         dotptr->x = ship.x + s[dir]*hx + (frnd()-0.5)*3;
 236                         dotptr->y = ship.y + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 237                         if(dir&1) {
 238                                 dotptr->dx = ship.dx + 2*dx;
 239                                 dotptr->dy = ship.dy + 20*dy;
 240                                 dotptr->life = 60 * fabs(dy);
 241                         } else {
 242                                 dotptr->dx = ship.dx + 20*dx;
 243                                 dotptr->dy = ship.dy + 2*dy;
 244                                 dotptr->life = 60 * fabs(dx);
 245                         }
 246
 247                         if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 248                         else dotptr = edot;
 249                 }
 250         }
 251 }
 252
 253 void
 254 draw_engine_dots(SDL_Surface *s) {
 255         int i;
 256         uint16_t c;
 257         uint16_t *pixels = (uint16_t *) s->pixels;
 258         int row_inc = s->pitch/sizeof(uint16_t);
 259         int heatindex;
 260         Sprite *hit;
 261
 262         for(i = 0; i<MAXENGINEDOTS; i++) {
 263                 if(!edot[i].active) continue;
 264                 edot[i].x += (edot[i].dx - screendx)*t_frame;
 265                 edot[i].y += (edot[i].dy - screendy)*t_frame;
 266                 edot[i].life -= t_frame*3;
 267                 if(edot[i].life < 0
 268                                 || edot[i].x<0 || edot[i].x >= XSIZE
 269                                 || edot[i].y<0 || edot[i].y >= YSIZE) {
 270                         edot[i].active = 0;
 271                         continue;
 272                 }
 273                 // check collisions
 274                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 275                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 276                                 edot[i].active = 0;
 277                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 278                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 279                                 continue;
 280                         }
 281                 }
 282                 heatindex = edot[i].life * 6;
 283                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 284                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 285         }
 286 }
 287
 288 void
 289 drawdots(SDL_Surface *s) {
 290         int m;
 291
 292         // Create engine dots out the side we're moving from
 293         for(m = 0; m<4; m++) {
 294                 if(ship.jets & 1<<m) { // 'jets' is a bit field
 295                         new_engine_dots(80,m);
 296                 }
 297         }
 298
 299         move_dust();
 300
 301         SDL_LockSurface(s);
 302         draw_dust(s);
 303         draw_engine_dots(s);
 304         draw_bang_dots(s);
 305         SDL_UnlockSurface(s);
 306 }
 307
 308 SDL_Surface *
 309 load_image(char *filename)
 310 {
 311         SDL_Surface *tmp, *img = NULL;
 312         char *s = add_data_path(filename);
 313         if(s) {
 314                 tmp = IMG_Load(s);
 315                 free(s);
 316                 if(tmp) {
 317                         img = SDL_DisplayFormat(tmp);
 318                         SDL_FreeSurface(tmp);
 319                 }
 320         }
 321         return img;
 322 }
 323
 324 void
 325 load_ship(void)
 326 {
 327         load_sprite(SPRITE(&ship), "sprites/ship.png");
 328 }
 329
 330 int
 331 init(void) {
 332
 333         int i;
 334         char *s;
 335         Uint32 flag;
 336
 337         // Where are our data files?
 338         if(!find_files()) exit(1);
 339         read_high_score_table();
 340
 341         if(opt_sound) {
 342                 // Initialize SDL with audio and video
 343                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 344                         opt_sound = 0;
 345                         fputs("Can't open sound, starting without it\n", stderr);
 346                         atexit(SDL_Quit);
 347                 } else {
 348                         atexit(SDL_Quit);
 349                         atexit(SDL_CloseAudio);
 350                         opt_sound = init_sound();
 351                 }
 352         } else {
 353                 // Initialize with video only
 354                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 355                 atexit(SDL_Quit);
 356         }
 357
 358         play_tune(TUNE_TITLE_PAGE);
 359
 360         // Attempt to get the required video size
 361         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 362         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 363         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 364
 365         // Set the title bar text
 366         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 367
 368         NULLERROR(surf_screen);
 369
 370         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 371         for(i = 0; i<W*3; i++) {
 372                 heatcolor[i] = SDL_MapRGB(
 373                         surf_screen->format,
 374                         (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?
 375                 );
 376         }
 377
 378         // Load the banners
 379         NULLERROR(surf_b_variations = load_image("banners/variations.png"));
 380         NULLERROR(surf_b_on = load_image("banners/on.png"));
 381         NULLERROR(surf_b_rockdodger = load_image("banners/rockdodger.png"));
 382
 383         NULLERROR(surf_b_game = load_image("banners/game.png"));
 384         NULLERROR(surf_b_over = load_image("banners/over.png"));
 385
 386         // Load the life indicator (small ship) graphic.
 387         NULLERROR(surf_life = load_image("indicators/life.png"));
 388
 389         // Load the font image
 390         s = add_data_path(BIG_FONT_FILE);
 391         if(s) {
 392                 NULLERROR(surf_font_big = IMG_Load(s));
 393                 free(s);
 394                 g_font = SFont_InitFont(surf_font_big);
 395         }
 396
 397         init_engine_dots();
 398         init_dust();
 399
 400         init_sprites();
 401         add_sprite(SPRITE(&ship));
 402
 403         // Remove the mouse cursor
 404 #ifdef SDL_DISABLE
 405         SDL_ShowCursor(SDL_DISABLE);
 406 #endif
 407
 408         return 0;
 409 }
 410
 411 void
 412 show_lives(void)
 413 {
 414         int i;
 415         SDL_Rect dest;
 416
 417         for(i=0; i<ship.lives-1; i++) {
 418                 dest.x = (i + 1)*(surf_life->w + 10);
 419                 dest.y = 20;
 420                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 421         }
 422 }
 423
 424 void
 425 draw_game_over(void)
 426 {
 427         int x;
 428         char *text0, *text1;
 429         SDL_Rect dest;
 430         float a_game = 0, a_over = 0;
 431
 432         // fade in "GAME", then "OVER".
 433         a_game = min(1.0, faderate*fadetimer/3.0);
 434         if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 435
 436         fadetimer += t_frame;
 437
 438         dest.x = (XSIZE-surf_b_game->w)/2;
 439         dest.y = (YSIZE-surf_b_game->h)/2-40;
 440         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 441         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 442
 443         dest.x = (XSIZE-surf_b_over->w)/2;
 444         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 445         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 446         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 447
 448         if(new_high_score(score)) {
 449                 text0 = "New High Score!";
 450                 text1 = "Press SPACE to continue";
 451         } else if(opt_gamespeed == EASY_GAMESPEED) {
 452                 text0 = "Press SPACE to start a new game";
 453                 text1 = "Press 'e' to start an easy game";
 454         } else {
 455                 text0 = "Press SPACE to start an easy game";
 456                 text1 = "Press 'n' to start a normal game";
 457         }
 458
 459         x = (XSIZE-SFont_TextWidth(g_font,text0))/2 + cos(fadetimer/4.5)*10;
 460         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text0);
 461
 462         x = (XSIZE-SFont_TextWidth(g_font,text1))/2 + sin(fadetimer/4.5)*10;
 463         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text1);
 464 }
 465
 466 void
 467 draw_title_page(void)
 468 {
 469         int x;
 470         char *text;
 471         SDL_Rect dest;
 472
 473         fadetimer += t_frame/2.0;
 474
 475         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 476         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 477         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 478         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 479
 480         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 481         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 482         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 483         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 484
 485         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 486         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 487         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 488         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 489
 490         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 491         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 492         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 493
 494         text = "Version " VERSION;
 495         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 496         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 497 }
 498
 499 void
 500 draw(void) {
 501
 502         SDL_FillRect(surf_screen,NULL,0);  // black background
 503         drawdots(surf_screen);             // background dots
 504         draw_sprite(SPRITE(&ship));
 505         draw_rocks();
 506
 507         show_lives();
 508         show_score();
 509
 510         // If it's game over, show the game over graphic in the dead centre
 511         switch (state) {
 512                 case GAME_OVER: draw_game_over(); break;
 513
 514                 case TITLE_PAGE: draw_title_page(); break;
 515
 516                 case HIGH_SCORE_ENTRY:
 517                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 518                         if(!process_score_input()) {  // done inputting name
 519
 520                                 // Change state to briefly show high scores page
 521                                 state = HIGH_SCORE_DISPLAY;
 522                                 state_timeout = 200;
 523
 524                                 // Write the high score table to the file
 525                                 write_high_score_table();
 526
 527                                 play_tune(TUNE_TITLE_PAGE);
 528                         }
 529                 // FALL THROUGH TO
 530                 case HIGH_SCORE_DISPLAY:
 531                         // Display de list o high scores mon.
 532                         display_scores(surf_screen, 150,50);
 533                         break;
 534                 case GAMEPLAY:
 535                 case DEAD_PAUSE:
 536                         ; // no action necessary
 537         }
 538
 539         collisions();
 540
 541         ms_frame = SDL_GetTicks() - ms_end;
 542         ms_end += ms_frame;
 543         t_frame = opt_gamespeed * ms_frame / 50;
 544         if(state == GAMEPLAY) score += ms_frame;
 545
 546         // Update the surface
 547         SDL_Flip(surf_screen);
 548 }
 549
 550 static inline void
 551 kill_ship(Sprite *ship)
 552 {
 553         ship->flags = MOVE;
 554         // ship->flags = MOVE|DRAW;  // FADE SHIP
 555         // SDL_SetAlpha(ship->image, SDL_SRCALPHA, 0); // FADE SHIP
 556         bang = true;
 557 }
 558
 559 void
 560 do_collision(Sprite *a, Sprite *b)
 561 {
 562         if(a->type == SHIP) kill_ship(a);
 563         else if (b->type == SHIP) kill_ship(b);
 564         else bounce(a, b);
 565 }
 566
 567 void
 568 init_score_entry(void)
 569 {
 570         SDL_Event e;
 571         state = HIGH_SCORE_ENTRY;
 572         state_timeout = 5.0e6;
 573         SDL_EnableUNICODE(1);
 574         while(SDL_PollEvent(&e))
 575                 ;
 576 }
 577
 578 void
 579 gameloop() {
 580         Uint8 *keystate = SDL_GetKeyState(NULL);
 581         float tmp;
 582
 583
 584         for(;;) {
 585                 SDL_PumpEvents();
 586                 keystate = SDL_GetKeyState(NULL);
 587
 588                 if(!paused) {
 589                         // Count down the game loop timer, and change state when it gets to zero or less;
 590
 591                         if((state_timeout -= t_frame*3) < 0) {
 592                                 switch(state) {
 593                                         case DEAD_PAUSE:
 594                                                 // Restore the ship and continue playing
 595                                                 ship.flags = DRAW|MOVE|COLLIDE;
 596                                                 state = GAMEPLAY;
 597                                                 play_tune(TUNE_GAMEPLAY);
 598                                                 break;
 599                                         case GAME_OVER:
 600                                                 if(new_high_score(score)) init_score_entry();
 601                                                 else {
 602                                                         state = HIGH_SCORE_DISPLAY;
 603                                                         state_timeout = 400;
 604                                                 }
 605                                                 break;
 606                                         case HIGH_SCORE_DISPLAY:
 607                                                 state = TITLE_PAGE;
 608                                                 state_timeout = 500.0;
 609                                                 break;
 610                                         case HIGH_SCORE_ENTRY:
 611                                                 break;
 612                                         case TITLE_PAGE:
 613                                                 state = HIGH_SCORE_DISPLAY;
 614                                                 state_timeout = 200.0;
 615                                                 break;
 616                                         case GAMEPLAY:
 617                                                 ; // no action necessary
 618                                 }
 619                         } else {
 620                                 if(state == DEAD_PAUSE) {
 621                                         float blast_radius;
 622                                         // float alpha;  // FADE SHIP
 623                                         if(state_timeout >= DEAD_PAUSE_LENGTH - 20.0) {
 624                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 625                                                 blast_rocks(bangx, bangy, blast_radius);
 626                                         }
 627
 628                                         if(bangx < 60) bangx = 60;
 629
 630                                         // FADE SHIP
 631                                         // alpha = 255.0 * (DEAD_PAUSE_LENGTH - state_timeout) / DEAD_PAUSE_LENGTH;
 632                                         // SDL_SetAlpha(ship.image, SDL_SRCALPHA, (uint8_t)alpha);
 633                                 }
 634                         }
 635
 636                         new_rocks();
 637
 638                         // SCROLLING
 639                         tmp = (ship.y+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
 640                         screendy += tmp * t_frame/12;
 641                         tmp = (ship.x+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
 642                         screendx += tmp * t_frame/12;
 643                         // taper off so we don't hit the barrier abruptly.
 644                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 645                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
 646                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 647                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 648                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 649
 650                         // move bang center
 651                         bangx += (bangdx - screendx)*t_frame;
 652                         bangy += (bangdy - screendy)*t_frame;
 653
 654                         move_sprites();
 655
 656
 657                         // BOUNCE off left or right edge of screen
 658                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 659                                 ship.x -= (ship.dx-screendx)*t_frame;
 660                                 ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
 661                         }
 662
 663                         // BOUNCE off top or bottom of screen
 664                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 665                                 ship.y -= (ship.dy-screendy)*t_frame;
 666                                 ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
 667                         }
 668
 669                         draw();
 670
 671                         if(state == GAMEPLAY && bang) {
 672                                 // Died
 673                                 bang = false;
 674                                 play_sound(SOUND_BANG); // Play the explosion sound
 675                                 bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
 676                                 new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
 677
 678                                 if(--ship.lives) {
 679                                         state = DEAD_PAUSE;
 680                                         state_timeout = DEAD_PAUSE_LENGTH;
 681                                         ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
 682                                         ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
 683                                         if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
 684                                 } else {
 685                                         state = GAME_OVER;
 686                                         ship.dx = SCREENDXMIN; ship.dy = 0;
 687                                         state_timeout = 200.0;
 688                                         fadetimer = 0.0;
 689                                         faderate = t_frame;
 690                                 }
 691                         }
 692
 693                         // new game
 694                         if((keystate[SDLK_SPACE] || keystate[SDLK_e] || keystate[SDLK_n])
 695                            && (state == HIGH_SCORE_DISPLAY
 696                                || state == TITLE_PAGE
 697                                || state == GAME_OVER)) {
 698                                 if(state == GAME_OVER && new_high_score(score))
 699                                         init_score_entry();
 700                                 else {
 701                                         if(keystate[SDLK_n] || (keystate[SDLK_SPACE] && !initial_rocks)) {
 702                                                 initial_rocks = NORMAL_I_ROCKS;
 703                                                 final_rocks = NORMAL_F_ROCKS;
 704                                                 if(opt_gamespeed == EASY_GAMESPEED)
 705                                                         opt_gamespeed = NORMAL_GAMESPEED;
 706                                         } else if(keystate[SDLK_e]) {
 707                                                 initial_rocks = EASY_I_ROCKS;
 708                                                 final_rocks = EASY_F_ROCKS;
 709                                                 opt_gamespeed = EASY_GAMESPEED;
 710                                         }
 711                                         reset_sprites();
 712                                         reset_rocks();
 713                                         screendx = SCREENDXMIN; screendy = 0;
 714
 715                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2;
 716                                         ship.dx = screendx; ship.dy = screendy;
 717                                         ship.lives = 4;
 718                                         ship.flags = MOVE|DRAW|COLLIDE;
 719                                         // SDL_SetAlpha(ship.image, SDL_SRCALPHA, SDL_ALPHA_OPAQUE);  // FADE SHIP
 720                                         add_sprite(SPRITE(&ship));
 721
 722                                         score = 0;
 723
 724                                         state = GAMEPLAY;
 725                                         play_tune(TUNE_GAMEPLAY);
 726                                 }
 727                         }
 728
 729                         ship.jets = 0;
 730                 }
 731
 732                 if(state == GAMEPLAY) {
 733                         if(!paused) {
 734                                 if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { ship.dx -= 1.5*t_frame; ship.jets |= 1<<0;}
 735                                 if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { ship.dy += 1.5*t_frame; ship.jets |= 1<<1;}
 736                                 if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { ship.dx += 1.5*t_frame; ship.jets |= 1<<2;}
 737                                 if(keystate[SDLK_UP]    | keystate[SDLK_c]) { ship.dy -= 1.5*t_frame; ship.jets |= 1<<3;}
 738                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 739                         }
 740
 741                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 742                                 if(!pausedown) {
 743                                         paused = !paused;
 744                                         pausedown = 1;
 745                                         if(!paused) ms_end = SDL_GetTicks();
 746                                 }
 747                         } else {
 748                                 pausedown = 0;
 749                         }
 750                 }
 751
 752                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE]))
 753                         return;
 754
 755         }
 756 }
 757
 758 int
 759 main(int argc, char **argv) {
 760         init_opts();
 761         argp_parse(&argp, argc, argv, 0, 0, 0);
 762
 763         if(init()) {
 764                 printf ("ta: '%s'\n",initerror);
 765                 return 1;
 766         }
 767
 768         gameloop();
 769
 770         return 0;
 771 }