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 #ifdef DEBUG
  23 #include "debug.h"
  24 #endif
  25
  26 #include "args.h"
  27 #include "config.h"
  28 #include "file.h"
  29 #include "globals.h"
  30 #include "rocks.h"
  31 #include "score.h"
  32 #include "shape.h"
  33 #include "sound.h"
  34
  35 #include <argp.h>
  36 #include <math.h>
  37 #include <SDL/SDL.h>
  38 #include <SDL/SDL_image.h>
  39 #include <stdarg.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #include "SFont.h"
  45
  46 // ************************************* VARS
  47 // SDL_Surface global variables
  48 SDL_Surface
  49         *surf_screen,   // Screen
  50         *surf_b_variations, // "variations" banner
  51         *surf_b_on, // "on" banner
  52         *surf_b_rockdodger, // "rockdodger" banner
  53         *surf_b_game,   // Title element "game"
  54         *surf_b_over,   // Title element "over"
  55         *surf_ship,             // Spaceship element
  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 struct spacedot sdot[MAXSPACEDOTS];
  67
  68 // Other global variables
  69 char topline[1024];
  70 char *initerror = "";
  71
  72
  73
  74 struct shape shipshape;
  75 float shipx = XSIZE/2, shipy = YSIZE/2; // X position, 0..XSIZE
  76 float shipdx = SCREENDXMIN, shipdy = 0.0;       // Change in X position per tick.
  77 float screendx = SCREENDXMIN, screendy = 0.0;
  78 float xscroll, yscroll;
  79 float back_dist;
  80 float framelen;  // this controls the speed of everything that moves.
  81
  82 float bangx, bangy, bangdx, bangdy;
  83
  84 int nships,score,ticks_since_last,last_ticks;
  85 int gameover;
  86 int maneuver = 0;
  87
  88 float fadetimer = 0, faderate;
  89
  90 int pausedown = 0, paused = 0;
  91
  92 // bangdot start (bd1) and end (bd2) position:
  93 int bd1 = 0, bd2 = 0;
  94
  95 enum states {
  96         TITLE_PAGE,
  97         GAMEPLAY,
  98         DEAD_PAUSE,
  99         GAME_OVER,
 100         HIGH_SCORE_ENTRY,
 101         HIGH_SCORE_DISPLAY
 102 };
 103 enum states state = TITLE_PAGE;
 104 float state_timeout = 600.0;
 105
 106 #define NSEQUENCE 2
 107 char *sequence[] = {
 108         "Press SPACE to start",
 109         "http://herkamire.com/jason/vor"
 110 };
 111
 112 int bangdotlife, nbangdots;
 113 Uint16 heatcolor[W*3];
 114
 115 char *data_dir;
 116 extern char *optarg;
 117 extern int optind, opterr, optopt;
 118
 119 // ************************************* FUNCS
 120
 121 float
 122 rnd() {
 123         return (float)random()/(float)RAND_MAX;
 124 }
 125
 126 void
 127 init_engine_dots() {
 128         int i;
 129         for(i = 0; i<MAXENGINEDOTS; i++) {
 130                 edot[i].active = 0;
 131         }
 132 }
 133
 134 void
 135 init_space_dots() {
 136         int i,b;
 137         for(i = 0; i<MAXSPACEDOTS; i++) {
 138                 sdot[i].x = rnd()*(XSIZE-5);
 139                 sdot[i].y = rnd()*(YSIZE-5);
 140                 sdot[i].z = MAXDUSTDEPTH*sqrt(rnd());
 141                 b = (MAXDUSTDEPTH - sdot[i].z) * 255.0 / MAXDUSTDEPTH;
 142                 sdot[i].color = SDL_MapRGB(surf_screen->format, b, b, b);
 143         }
 144 }
 145
 146 void
 147 make_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s, int power) {
 148
 149         // TODO - stop generating dots after a certain amount of time has passed, to cope with slower CPUs.
 150         // TODO - generate and display dots in a circular buffer
 151
 152         int x,y,endcount;
 153         Uint16 *rawpixel,c;
 154         double theta,r;
 155         int begin_generate;
 156
 157         begin_generate = SDL_GetTicks();
 158
 159         SDL_LockSurface(s);
 160         rawpixel = (Uint16 *) s->pixels;
 161
 162         //for(n = 0; n <= power/2; n++) {
 163
 164         endcount = 0;
 165         while (endcount<3) {
 166                 for(x = 0; x<s->w; x++) {
 167                         for(y = 0; y<s->h; y++) {
 168                                 c = rawpixel[s->pitch/2*y + x];
 169                                 if(c && c != s->format->colorkey) {
 170
 171                                         theta = rnd()*M_PI*2;
 172
 173                                         r = 1-(rnd()*rnd());
 174
 175                                         bdot[bd2].dx = (power/50.0)*45.0*cos(theta)*r + dx;
 176                                         bdot[bd2].dy = (power/50.0)*45.0*sin(theta)*r + dy;
 177                                         bdot[bd2].x = x + xbang;
 178                                         bdot[bd2].y = y + ybang;
 179
 180                                         // Replace the last few bang dots with the pixels from the exploding object
 181                                         bdot[bd2].c = (endcount>0)?c:0;
 182                                         bdot[bd2].life = 100;
 183                                         bdot[bd2].decay = rnd()*3 + 1;
 184                                         bdot[bd2].active = 1;
 185
 186                                         bd2++;
 187                                         bd2 %= MAXBANGDOTS;
 188
 189                                         // If the circular buffer is filled, who cares? They've had their chance.
 190                                         //if(bd2 == bd1-1) goto exitloop;
 191
 192                                 }
 193                         }
 194                 }
 195
 196                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 197         }
 198
 199         SDL_UnlockSurface(s);
 200
 201 }
 202
 203 void
 204 draw_bang_dots(SDL_Surface *s) {
 205         int i;
 206         int first_i, last_i;
 207         Uint16 *rawpixel;
 208         rawpixel = (Uint16 *) s->pixels;
 209
 210         first_i = -1;
 211         last_i = 0;
 212
 213         for(i = bd1; (bd1 <= bd2)?(i<bd2):(i >= bd1 && i < bd2); last_i = ++i) {
 214
 215                 i %= MAXBANGDOTS;
 216
 217                 if(bdot[i].x <= 0 || bdot[i].x >= XSIZE || bdot[i].y <= 0 || bdot[i].y >= YSIZE) {
 218                         // If the dot has drifted outside the perimeter, kill it
 219                         bdot[i].active = 0;
 220                 }
 221
 222                 if(bdot[i].active) {
 223                         if(first_i < 0)
 224                         first_i = i;
 225                         //last_i = i + 1;
 226                         rawpixel[(int)(s->pitch/2*(int)(bdot[i].y)) + (int)(bdot[i].x)] = bdot[i].c ? bdot[i].c : heatcolor[(int)(bdot[i].life*3)];
 227                         bdot[i].life -= bdot[i].decay;
 228                         bdot[i].x += bdot[i].dx*framelen - xscroll;
 229                         bdot[i].y += bdot[i].dy*framelen - yscroll;
 230
 231                         if(bdot[i].life<0)
 232                         bdot[i].active = 0;
 233                 }
 234         }
 235
 236         if(first_i >= 0) {
 237                 bd1 = first_i;
 238                 bd2 = last_i;
 239         }
 240         else {
 241                 bd1 = 0;
 242                 bd2 = 0;
 243         }
 244
 245 }
 246
 247
 248 void
 249 draw_space_dots(SDL_Surface *s) {
 250         int i;
 251         Uint16 *rawpixel;
 252         rawpixel = (Uint16 *) s->pixels;
 253
 254         for(i = 0; i<MAXSPACEDOTS; i++) {
 255                 if(sdot[i].y<0) {
 256                         sdot[i].y = 0;
 257                 }
 258                 rawpixel[(int)(s->pitch/2*(int)sdot[i].y) + (int)(sdot[i].x)] = sdot[i].color;
 259                 sdot[i].x -= xscroll / (1.3 + sdot[i].z);
 260                 sdot[i].y -= yscroll / (1.3 + sdot[i].z);
 261                 if(sdot[i].y >= XSIZE) sdot[i].x -= XSIZE;
 262                 else if(sdot[i].x < 0) sdot[i].x = XSIZE-1;
 263                 if(sdot[i].y > YSIZE) sdot[i].y -= YSIZE;
 264                 else if(sdot[i].y < 0) sdot[i].y += YSIZE-1;
 265         }
 266 }
 267
 268 void
 269 draw_engine_dots(SDL_Surface *s) {
 270         int i;
 271         Uint16 *rawpixel;
 272         rawpixel = (Uint16 *) s->pixels;
 273
 274         for(i = 0; i<MAXENGINEDOTS; i++) {
 275                 if(edot[i].active) {
 276                         edot[i].x += edot[i].dx*framelen - xscroll;
 277                         edot[i].y += edot[i].dy*framelen - yscroll;
 278                         if((edot[i].life -= framelen*3)<0 || edot[i].y<0 || edot[i].y>YSIZE) {
 279                                 edot[i].active = 0;
 280                         } else if(edot[i].x<0 || edot[i].x>XSIZE) {
 281                                 edot[i].active = 0;
 282                         } else {
 283                                 int heatindex;
 284                                 heatindex = edot[i].life * 6;
 285                                 //rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = lifecolor[(int)(edot[i].life)];
 286                                 rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 287                         }
 288                 }
 289         }
 290 }
 291
 292 void
 293 create_engine_dots(int newdots) {
 294         int i;
 295         double theta,r,dx,dy;
 296
 297         if(!opt_tail_engine) return;
 298
 299         if(state == GAMEPLAY) {
 300                 for(i = 0; i<newdots*framelen; i++) {
 301                         if(dotptr->active == 0) {
 302                                 theta = rnd()*M_PI*2;
 303                                 r = rnd();
 304                                 dx = cos(theta)*r;
 305                                 dy = sin(theta)*r;
 306
 307                                 dotptr->active = 1;
 308                                 dotptr->x = shipx + surf_ship->w/2-14;
 309                                 dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*5-1;
 310                                 dotptr->dx = 10*(dx-1.5) + shipdx;
 311                                 dotptr->dy = 1*dy + shipdy;
 312                                 dotptr->life = 45 + rnd(1)*5;
 313
 314                                 dotptr++;
 315                                 if(dotptr-edot >= MAXENGINEDOTS) {
 316                                         dotptr = edot;
 317                                 }
 318                         }
 319                 }
 320         }
 321 }
 322
 323 void
 324 create_engine_dots2(int newdots, int m) {
 325         int i;
 326         double theta, theta2, dx, dy, adx, ady;
 327
 328         // Don't create fresh engine dots when
 329         // the game is not being played and a demo is not beng shown
 330         if(state != GAMEPLAY) return;
 331
 332         for(i = 0; i<newdots; i++) {
 333                 if(dotptr->active == 0) {
 334                         theta = rnd()*M_PI*2;
 335                         theta2 = rnd()*M_PI*2;
 336
 337                         dx = cos(theta) * fabs(cos(theta2));
 338                         dy = sin(theta) * fabs(cos(theta2));
 339                         adx = fabs(dx);
 340                         ady = fabs(dy);
 341
 342
 343                         dotptr->active = 1;
 344                         dotptr->x = shipx + surf_ship->w/2 + (rnd()-0.5)*3;
 345                         dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*3;
 346
 347                         switch(m) {
 348                                 case 0:
 349                                         dotptr->x -= 14;
 350                                         dotptr->dx = -20*adx + shipdx;
 351                                         dotptr->dy = 2*dy + shipdy;
 352                                         dotptr->life = 60 * adx;
 353                                 break;
 354                                 case 1:
 355                                         dotptr->dx = 2*dx + shipdx;
 356                                         dotptr->dy = -20*ady + shipdy;
 357                                         dotptr->life = 60 * ady;
 358                                 break;
 359                                 case 2:
 360                                         dotptr->x += 14;
 361                                         dotptr->dx = 20*adx + shipdx;
 362                                         dotptr->dy = 2*dy + shipdy;
 363                                         dotptr->life = 60 * adx;
 364                                 break;
 365                                 case 3:
 366                                         dotptr->dx = 2*dx + shipdx;
 367                                         dotptr->dy = 20*ady + shipdy;
 368                                         dotptr->life = 60 * ady;
 369                                 break;
 370                         }
 371                         dotptr++;
 372                         if(dotptr-edot >= MAXENGINEDOTS) {
 373                                 dotptr = edot;
 374                         }
 375                 }
 376         }
 377 }
 378
 379 void
 380 drawdots(SDL_Surface *s) {
 381         int m;
 382
 383         // Create more engine dots comin' out da back
 384         if(!gameover) create_engine_dots(200);
 385
 386         // Create engine dots out the side we're moving from
 387         for(m = 0; m<4; m++) {
 388                 if(maneuver & 1<<m) { // 'maneuver' is a bit field
 389                         create_engine_dots2(80,m);
 390                 }
 391         }
 392
 393         SDL_LockSurface(s);
 394         draw_space_dots(s);
 395         draw_engine_dots(s);
 396         draw_bang_dots(s);
 397         SDL_UnlockSurface(s);
 398 }
 399
 400 int
 401 init(void) {
 402
 403         int i;
 404         SDL_Surface *temp;
 405         Uint32 flag;
 406
 407         // Where are our data files?
 408         if(!find_files()) exit(1);
 409         read_high_score_table();
 410
 411         if(opt_sound) {
 412                 // Initialize SDL with audio and video
 413                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 414                         opt_sound = 0;
 415                         printf ("Can't open sound, starting without it\n");
 416                         atexit(SDL_Quit);
 417                 } else {
 418                         atexit(SDL_Quit);
 419                         atexit(SDL_CloseAudio);
 420                         opt_sound = init_sound();
 421                 }
 422         } else {
 423                 // Initialize with video only
 424                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 425                 atexit(SDL_Quit);
 426         }
 427
 428         play_tune(0);
 429
 430         // Attempt to get the required video size
 431         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 432         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 433         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 434
 435         // Set the title bar text
 436         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 437
 438         NULLERROR(surf_screen);
 439
 440         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 441         for(i = 0; i<W*3; i++) {
 442                 heatcolor[i] = SDL_MapRGB(
 443                         surf_screen->format,
 444                         (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?
 445                 );
 446         }
 447
 448         // Load the banners
 449         NULLERROR(temp = IMG_Load(add_path("banners/variations.png")));
 450         NULLERROR(surf_b_variations = SDL_DisplayFormat(temp));
 451
 452         NULLERROR(temp = IMG_Load(add_path("banners/on.png")));
 453         NULLERROR(surf_b_on = SDL_DisplayFormat(temp));
 454
 455         NULLERROR(temp = IMG_Load(add_path("banners/rockdodger.png")));
 456         NULLERROR(surf_b_rockdodger = SDL_DisplayFormat(temp));
 457
 458         NULLERROR(temp = IMG_Load(add_path("banners/game.png")));
 459         NULLERROR(surf_b_game = SDL_DisplayFormat(temp));
 460
 461         NULLERROR(temp = IMG_Load(add_path("banners/over.png")));
 462         NULLERROR(surf_b_over = SDL_DisplayFormat(temp));
 463
 464         surf_font_big = IMG_Load(add_path(BIG_FONT_FILE));
 465         g_font = SFont_InitFont(surf_font_big);
 466
 467         // Load the spaceship graphic.
 468         NULLERROR(temp = IMG_Load(add_path("sprites/ship.png")));
 469         NULLERROR(surf_ship = SDL_DisplayFormat(temp));
 470         get_shape(surf_ship, &shipshape);
 471
 472         // Load the life indicator (small ship) graphic.
 473         NULLERROR(temp = IMG_Load(add_path("indicators/life.png")));
 474         NULLERROR(surf_life = SDL_DisplayFormat(temp));
 475
 476         init_engine_dots();
 477         init_space_dots();
 478
 479         init_rocks();
 480
 481         // Remove the mouse cursor
 482 #ifdef SDL_DISABLE
 483         SDL_ShowCursor(SDL_DISABLE);
 484 #endif
 485
 486         return 0;
 487 }
 488
 489 int
 490 draw() {
 491         int i;
 492         SDL_Rect dest;
 493         int bang, x;
 494         char *text;
 495         float fadegame,fadeover;
 496
 497         bang = 0;
 498
 499         // Draw a fully black background
 500         SDL_FillRect(surf_screen,NULL,0);
 501
 502         // Draw the background dots
 503         drawdots(surf_screen);
 504
 505         // Draw ship
 506         if(!gameover && state == GAMEPLAY ) {
 507                 dest.x = shipx;
 508                 dest.y = shipy;
 509                 SDL_BlitSurface(surf_ship,NULL,surf_screen,&dest);
 510         }
 511
 512         draw_rocks();
 513
 514         // Draw the life indicators.
 515         if(state == GAMEPLAY || state == DEAD_PAUSE || state == GAME_OVER)
 516         for(i = 0; i<nships-1; i++) {
 517                 dest.x = (i + 1)*(surf_life->w + 10);
 518                 dest.y = 20;
 519                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 520         }
 521
 522         // Draw the score
 523         snprintscore_line(topline, 50, score);
 524         SFont_Write(surf_screen, g_font, XSIZE-250, 0, topline);
 525
 526         // If it's game over, show the game over graphic in the dead centre
 527         switch (state) {
 528                 case GAME_OVER:
 529                         if(fadetimer<3.0/faderate) {
 530                                 fadegame = fadetimer/(3.0/faderate);
 531                         } else {
 532                                 fadegame = 1.0;
 533                         }
 534
 535                         if(fadetimer<3.0/faderate) {
 536                                 fadeover = 0.0;
 537                         } else if(fadetimer<6.0/faderate) {
 538                                 fadeover = ((3.0/faderate)-fadetimer)/(6.0/faderate);
 539                         } else {
 540                                 fadeover = 1.0;
 541                         }
 542
 543                         dest.x = (XSIZE-surf_b_game->w)/2;
 544                         dest.y = (YSIZE-surf_b_game->h)/2-40;
 545                         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(fadegame*(200 + 55*cos(fadetimer += framelen/1.0))));
 546                         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 547
 548                         dest.x = (XSIZE-surf_b_over->w)/2;
 549                         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 550                         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(fadeover*(200 + 55*sin(fadetimer))));
 551                         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 552                 break;
 553
 554                 case TITLE_PAGE:
 555
 556                         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 557                         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 558                         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer += framelen/2.0)));
 559                         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 560
 561                         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 562                         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 563                         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 564                         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 565
 566                         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 567                         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 568                         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 569                         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 570
 571                         text = "Version " VERSION;
 572                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 573                         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 574
 575                         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 576                         //text = "Press SPACE to start!";
 577                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 578                         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 579                 break;
 580
 581                 case HIGH_SCORE_ENTRY:
 582                         play_tune(2);
 583                         if(!process_score_input()) {  // done inputting name
 584
 585                                 // Change state to briefly show high scores page
 586                                 state = HIGH_SCORE_DISPLAY;
 587                                 state_timeout = 200;
 588
 589                                 // Write the high score table to the file
 590                                 write_high_score_table();
 591
 592                                 // Play the title page tune
 593                                 play_tune(0);
 594                         }
 595                 // FALL THROUGH TO
 596                 case HIGH_SCORE_DISPLAY:
 597                         // Display de list o high scores mon.
 598                         display_scores(surf_screen, 150,50);
 599                         break;
 600                 case GAMEPLAY:
 601                 case DEAD_PAUSE:
 602                         ; // no action necessary
 603         }
 604
 605         if(!gameover && state == GAMEPLAY) {
 606                 bang = hit_rocks(shipx, shipy, &shipshape);
 607         }
 608
 609         ticks_since_last = SDL_GetTicks()-last_ticks;
 610         last_ticks = SDL_GetTicks();
 611         if(ticks_since_last>200 || ticks_since_last<0) {
 612                 // We won't run at all below 5 frames per second.
 613                 framelen = 0;
 614         } else {
 615                 framelen = opt_gamespeed*ticks_since_last/50.0;
 616                 if(state == GAMEPLAY) {
 617                         score += ticks_since_last;
 618                 }
 619         }
 620
 621         // Update the surface
 622         SDL_Flip(surf_screen);
 623
 624
 625         return bang;
 626 }
 627
 628 int
 629 gameloop() {
 630         Uint8 *keystate;
 631         float tmp;
 632
 633
 634         for(;;) {
 635                 if(!paused) {
 636                         // Count down the game loop timer, and change state when it gets to zero or less;
 637
 638                         if((state_timeout -= framelen*3) < 0) {
 639                                 switch(state) {
 640                                         case DEAD_PAUSE:
 641                                                 // Create a new ship and start all over again
 642                                                 state = GAMEPLAY;
 643                                                 play_tune(1);
 644                                                 break;
 645                                         case GAME_OVER:
 646                                                 if(new_high_score(score)) {
 647                                                         SDL_Event e;
 648                                                         state = HIGH_SCORE_ENTRY;
 649                                                         state_timeout = 5.0e6;
 650                                                         SDL_EnableUNICODE(1);
 651                                                         while(SDL_PollEvent(&e))
 652                                                                 ;
 653                                                 } else if(!keystate[SDLK_SPACE]) {
 654                                                         state = HIGH_SCORE_DISPLAY;
 655                                                         state_timeout = 400;
 656                                                 }
 657                                                 break;
 658                                         case HIGH_SCORE_DISPLAY:
 659                                                 state = TITLE_PAGE;
 660                                                 state_timeout = 500.0;
 661                                                 break;
 662                                         case HIGH_SCORE_ENTRY:
 663                                                 // state = TITLE_PAGE;
 664                                                 // play_tune(1);
 665                                                 // state_timeout = 100.0;
 666                                                 break;
 667                                         case TITLE_PAGE:
 668                                                 state = HIGH_SCORE_DISPLAY;
 669                                                 state_timeout = 200.0;
 670                                                 break;
 671                                         case GAMEPLAY:
 672                                                 ; // no action necessary
 673                                 }
 674                         } else {
 675                                 if(state == DEAD_PAUSE) {
 676                                         float blast_radius;
 677                                         int fixonly;
 678
 679                                         if(state_timeout < DEAD_PAUSE_LENGTH - 20.0) {
 680                                                 blast_radius = BLAST_RADIUS * 1.3;
 681                                                 fixonly = 1;
 682                                         } else {
 683                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 684                                                 fixonly = 0;
 685                                         }
 686                                         blast_rocks(bangx, bangy, blast_radius, fixonly);
 687
 688                                         if(bangx < 60) bangx = 60;
 689                                 }
 690                         }
 691
 692                         new_rocks();
 693
 694                         // FRICTION?
 695                         if(opt_friction) {
 696                                 shipdx *= pow((double)0.9,(double)framelen);
 697                                 shipdy *= pow((double)0.9,(double)framelen);
 698                         }
 699
 700                         // INERTIA
 701                         shipx += shipdx*framelen;
 702                         shipy += shipdy*framelen;
 703
 704                         // SCROLLING
 705                         tmp = shipy - (YSIZE / 2);
 706                         tmp += shipdy * 25;
 707                         tmp /= -25;
 708                         tmp = ((screendy * (framelen - 12)) + (tmp * framelen)) / 12;
 709                         screendy = -tmp;
 710                         tmp = shipx - (XSIZE / 3);
 711                         tmp += shipdx * 25;
 712                         tmp /= -25;
 713                         tmp = ((screendx * (framelen - 12)) + (tmp * framelen)) / 12;
 714                         screendx = -tmp;
 715
 716                         // taper off if we would hit the barrier in under 2 seconds.
 717                         if(back_dist + (screendx - SCREENDXMIN)*2*20*opt_gamespeed < 0) {
 718                                 screendx = SCREENDXMIN - (back_dist/(2*20*opt_gamespeed));
 719                         }
 720
 721                         xscroll = screendx * framelen;
 722                         yscroll = screendy * framelen;
 723                         back_dist += (screendx - SCREENDXMIN)*framelen;
 724
 725                         shipx -= xscroll;
 726                         shipy -= yscroll;
 727
 728                         // move bang center
 729                         bangx += bangdx*framelen - xscroll;
 730                         bangy += bangdy*framelen - yscroll;
 731
 732                         move_rocks();
 733
 734
 735                         // BOUNCE X
 736                         if(shipx<0 || shipx>XSIZE-surf_ship->w) {
 737                                 // BOUNCE from left and right wall
 738                                 shipx -= (shipdx-screendx)*framelen;
 739                                 shipdx = screendx - (shipdx-screendx)*opt_bounciness;
 740                         }
 741
 742                         // BOUNCE Y
 743                         if(shipy<0 || shipy>YSIZE-surf_ship->h) {
 744                                 // BOUNCE from top and bottom wall
 745                                 shipy -= (shipdy-screendy)*framelen;
 746                                 shipdy = screendy - (shipdy-screendy)*opt_bounciness;
 747                         }
 748
 749
 750                         if(draw() && state == GAMEPLAY) {
 751                                 // Died
 752                                 play_sound(0); // Play the explosion sound
 753                                 bangx = shipx; bangy = shipy; bangdx = shipdx; bangdy = shipdy;
 754                                 make_bang_dots(shipx,shipy,shipdx,shipdy,surf_ship,30);
 755                                 shipdx *= 0.5; shipdy *= 0.5;
 756                                 if(shipdx < SCREENDXMIN) shipdx = SCREENDXMIN;
 757                                 if(--nships <= 0) {
 758                                         state = GAME_OVER;
 759                                         gameover = 1;
 760                                         shipdx = 8; shipdy = 0;
 761                                         state_timeout = 200.0;
 762                                         fadetimer = 0.0;
 763                                         faderate = framelen;
 764                                 }
 765                                 else {
 766                                         state = DEAD_PAUSE;
 767                                         state_timeout = DEAD_PAUSE_LENGTH;
 768                                 }
 769                         }
 770
 771                         SDL_PumpEvents();
 772                         keystate = SDL_GetKeyState(NULL);
 773
 774                         // new game
 775                         if(keystate[SDLK_SPACE] && (state == HIGH_SCORE_DISPLAY || state == TITLE_PAGE)) {
 776
 777                                 reset_rocks();
 778
 779                                 nships = 4;
 780                                 score = 0;
 781
 782                                 state = GAMEPLAY;
 783                                 play_tune(1);
 784
 785                                 gameover = 0;
 786                                 shipx = XSIZE/2.2; shipy = YSIZE/2;
 787                                 shipdx = screendx; shipdy = screendy;
 788                         }
 789
 790                         maneuver = 0;
 791                 } else {
 792                         SDL_PumpEvents();
 793                         keystate = SDL_GetKeyState(NULL);
 794                 }
 795
 796                 if(state == GAMEPLAY) {
 797                         if(!gameover) {
 798
 799                                 if(!paused) {
 800                                         if(keystate[SDLK_UP] | keystate[SDLK_c])                { shipdy -= 1.5*framelen; maneuver |= 1<<3;}
 801                                         if(keystate[SDLK_DOWN] | keystate[SDLK_t])              { shipdy += 1.5*framelen; maneuver |= 1<<1;}
 802                                         if(keystate[SDLK_LEFT] | keystate[SDLK_h])              { shipdx -= 1.5*framelen; maneuver |= 1<<2;}
 803                                         if(keystate[SDLK_RIGHT] | keystate[SDLK_n])             { shipdx += 1.5*framelen; maneuver |= 1;}
 804                                         if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 805                                 }
 806
 807                                 if(keystate[SDLK_p] | keystate[SDLK_s]) {
 808                                         if(!pausedown) {
 809                                                 paused = !paused;
 810                                                 pausedown = 1;
 811                                         }
 812                                 } else {
 813                                         pausedown = 0;
 814                                 }
 815
 816                         }
 817                         else {
 818                                 paused = 0;
 819                                 pausedown = 0;
 820                         }
 821                 } else if(state == GAME_OVER) {
 822                         if(keystate[SDLK_SPACE]) {
 823                                 state_timeout = -1;
 824                         }
 825                 }
 826
 827                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE])) {
 828                         return 0;
 829                 }
 830
 831         }
 832 }
 833
 834 int
 835 main(int argc, char **argv) {
 836         init_opts();
 837         argp_parse(&argp, argc, argv, 0, 0, 0);
 838
 839         if(init()) {
 840                 printf ("ta: '%s'\n",initerror);
 841                 return 1;
 842         }
 843
 844         reset_rocks();
 845         gameloop();
 846
 847         return 0;
 848 }