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 "config.h"
  27 #include "file.h"
  28 #include "globals.h"
  29 #include "rocks.h"
  30 #include "score.h"
  31 #include "shape.h"
  32 #include "sound.h"
  33
  34 #include <math.h>
  35 #include <SDL/SDL.h>
  36 #include <SDL/SDL_image.h>
  37 #include <stdarg.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #include "SFont.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_ship,             // Spaceship element
  55         *surf_life,     // Indicator of number of ships remaining
  56         *surf_rock[NROCKS],     // THE ROCKS
  57         *surf_font_big; // The big font
  58
  59
  60 SFont_Font *g_font;
  61
  62 // Structure global variables
  63 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
  64 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
  65 struct spacedot sdot[MAXSPACEDOTS];
  66
  67 // Other global variables
  68 char topline[1024];
  69 char *initerror = "";
  70
  71 struct shape shipshape;
  72 float shipx = XSIZE/2, shipy = YSIZE/2; // X position, 0..XSIZE
  73 float shipdx = 7.5, shipdy = 0.0;       // Change in X position per tick.
  74 float screendx = 7.5, screendy = 0.0;
  75 float xscroll, yscroll;
  76 float gamerate;  // this controls the speed of everything that moves.
  77
  78 float bangx, bangy, bangdx, bangdy;
  79
  80 int nships,score,game_ticks,ticks_since_last,last_ticks;
  81 int gameover;
  82 int maneuver = 0;
  83 int sound_flag, music_flag;
  84 int tail_plume; // display big engine at the back?
  85 int friction;   // should there be friction?
  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 2
 105 char *sequence[] = {
 106         "Press SPACE to start",
 107         "http://qualdan.com/vor/"
 108 };
 109
 110 int bangdotlife, nbangdots;
 111 Uint16 heatcolor[W*3];
 112
 113 char *data_dir;
 114 extern char *optarg;
 115 extern int optind, opterr, optopt;
 116
 117 // ************************************* FUNCS
 118
 119 float
 120 rnd() {
 121         return (float)random()/(float)RAND_MAX;
 122 }
 123
 124 void
 125 init_engine_dots() {
 126         int i;
 127         for(i = 0; i<MAXENGINEDOTS; i++) {
 128                 edot[i].active = 0;
 129         }
 130 }
 131
 132 void
 133 init_space_dots() {
 134         int i,b;
 135         for(i = 0; i<MAXSPACEDOTS; i++) {
 136                 sdot[i].x = rnd()*(XSIZE-5);
 137                 sdot[i].y = rnd()*(YSIZE-5);
 138                 sdot[i].z = MAXDUSTDEPTH*sqrt(rnd());
 139                 b = (MAXDUSTDEPTH - sdot[i].z) * 255.0 / MAXDUSTDEPTH;
 140                 sdot[i].color = SDL_MapRGB(surf_screen->format, b, b, b);
 141         }
 142 }
 143
 144 void
 145 make_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s, int power) {
 146
 147         // TODO - stop generating dots after a certain amount of time has passed, to cope with slower CPUs.
 148         // TODO - generate and display dots in a circular buffer
 149
 150         int x,y,endcount;
 151         Uint16 *rawpixel,c;
 152         double theta,r;
 153         int begin_generate;
 154
 155         begin_generate = SDL_GetTicks();
 156
 157         SDL_LockSurface(s);
 158         rawpixel = (Uint16 *) s->pixels;
 159
 160         //for(n = 0; n <= power/2; n++) {
 161
 162         endcount = 0;
 163         while (endcount<3) {
 164                 for(x = 0; x<s->w; x++) {
 165                         for(y = 0; y<s->h; y++) {
 166                                 c = rawpixel[s->pitch/2*y + x];
 167                                 if(c && c != s->format->colorkey) {
 168
 169                                         theta = rnd()*M_PI*2;
 170
 171                                         r = 1-(rnd()*rnd());
 172
 173                                         bdot[bd2].dx = (power/50.0)*45.0*cos(theta)*r + dx;
 174                                         bdot[bd2].dy = (power/50.0)*45.0*sin(theta)*r + dy;
 175                                         bdot[bd2].x = x + xbang;
 176                                         bdot[bd2].y = y + ybang;
 177
 178                                         // Replace the last few bang dots with the pixels from the exploding object
 179                                         bdot[bd2].c = (endcount>0)?c:0;
 180                                         bdot[bd2].life = 100;
 181                                         bdot[bd2].decay = rnd()*3 + 1;
 182                                         bdot[bd2].active = 1;
 183
 184                                         bd2++;
 185                                         bd2 %= MAXBANGDOTS;
 186
 187                                         // If the circular buffer is filled, who cares? They've had their chance.
 188                                         //if(bd2 == bd1-1) goto exitloop;
 189
 190                                 }
 191                         }
 192                 }
 193
 194                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 195         }
 196
 197         SDL_UnlockSurface(s);
 198
 199 }
 200
 201 void
 202 draw_bang_dots(SDL_Surface *s) {
 203         int i;
 204         int first_i, last_i;
 205         Uint16 *rawpixel;
 206         rawpixel = (Uint16 *) s->pixels;
 207
 208         first_i = -1;
 209         last_i = 0;
 210
 211         for(i = bd1; (bd1 <= bd2)?(i<bd2):(i >= bd1 && i < bd2); last_i = ++i) {
 212
 213                 i %= MAXBANGDOTS;
 214
 215                 if(bdot[i].x <= 0 || bdot[i].x >= XSIZE || bdot[i].y <= 0 || bdot[i].y >= YSIZE) {
 216                         // If the dot has drifted outside the perimeter, kill it
 217                         bdot[i].active = 0;
 218                 }
 219
 220                 if(bdot[i].active) {
 221                         if(first_i < 0)
 222                         first_i = i;
 223                         //last_i = i + 1;
 224                         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)];
 225                         bdot[i].life -= bdot[i].decay;
 226                         bdot[i].x += bdot[i].dx*gamerate - xscroll;
 227                         bdot[i].y += bdot[i].dy*gamerate - yscroll;
 228
 229                         if(bdot[i].life<0)
 230                         bdot[i].active = 0;
 231                 }
 232         }
 233
 234         if(first_i >= 0) {
 235                 bd1 = first_i;
 236                 bd2 = last_i;
 237         }
 238         else {
 239                 bd1 = 0;
 240                 bd2 = 0;
 241         }
 242
 243 }
 244
 245
 246 void
 247 draw_space_dots(SDL_Surface *s) {
 248         int i;
 249         Uint16 *rawpixel;
 250         rawpixel = (Uint16 *) s->pixels;
 251
 252         for(i = 0; i<MAXSPACEDOTS; i++) {
 253                 if(sdot[i].y<0) {
 254                         sdot[i].y = 0;
 255                 }
 256                 rawpixel[(int)(s->pitch/2*(int)sdot[i].y) + (int)(sdot[i].x)] = sdot[i].color;
 257                 sdot[i].x -= xscroll / (1.3 + sdot[i].z);
 258                 sdot[i].y -= yscroll / (1.3 + sdot[i].z);
 259                 if(sdot[i].y >= XSIZE) sdot[i].x -= XSIZE;
 260                 else if(sdot[i].x < 0) sdot[i].x = XSIZE-1;
 261                 if(sdot[i].y > YSIZE) sdot[i].y -= YSIZE;
 262                 else if(sdot[i].y < 0) sdot[i].y += YSIZE-1;
 263         }
 264 }
 265
 266 void
 267 draw_engine_dots(SDL_Surface *s) {
 268         int i;
 269         Uint16 *rawpixel;
 270         rawpixel = (Uint16 *) s->pixels;
 271
 272         for(i = 0; i<MAXENGINEDOTS; i++) {
 273                 if(edot[i].active) {
 274                         edot[i].x += edot[i].dx*gamerate - xscroll;
 275                         edot[i].y += edot[i].dy*gamerate - yscroll;
 276                         if((edot[i].life -= gamerate*3)<0 || edot[i].y<0 || edot[i].y>YSIZE) {
 277                                 edot[i].active = 0;
 278                         } else if(edot[i].x<0 || edot[i].x>XSIZE) {
 279                                 edot[i].active = 0;
 280                         } else {
 281                                 int heatindex;
 282                                 heatindex = edot[i].life * 6;
 283                                 //rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = lifecolor[(int)(edot[i].life)];
 284                                 rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 285                         }
 286                 }
 287         }
 288 }
 289
 290 void
 291 create_engine_dots(int newdots) {
 292         int i;
 293         double theta,r,dx,dy;
 294
 295         if(!tail_plume) return;
 296
 297         if(state == GAMEPLAY) {
 298                 for(i = 0; i<newdots*gamerate; i++) {
 299                         if(dotptr->active == 0) {
 300                                 theta = rnd()*M_PI*2;
 301                                 r = rnd();
 302                                 dx = cos(theta)*r;
 303                                 dy = sin(theta)*r;
 304
 305                                 dotptr->active = 1;
 306                                 dotptr->x = shipx + surf_ship->w/2-14;
 307                                 dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*5-1;
 308                                 dotptr->dx = 10*(dx-1.5) + shipdx;
 309                                 dotptr->dy = 1*dy + shipdy;
 310                                 dotptr->life = 45 + rnd(1)*5;
 311
 312                                 dotptr++;
 313                                 if(dotptr-edot >= MAXENGINEDOTS) {
 314                                         dotptr = edot;
 315                                 }
 316                         }
 317                 }
 318         }
 319 }
 320
 321 void
 322 create_engine_dots2(int newdots, int m) {
 323         int i;
 324         double theta, theta2, dx, dy, adx, ady;
 325
 326         // Don't create fresh engine dots when
 327         // the game is not being played and a demo is not beng shown
 328         if(state != GAMEPLAY) return;
 329
 330         for(i = 0; i<newdots; i++) {
 331                 if(dotptr->active == 0) {
 332                         theta = rnd()*M_PI*2;
 333                         theta2 = rnd()*M_PI*2;
 334
 335                         dx = cos(theta) * fabs(cos(theta2));
 336                         dy = sin(theta) * fabs(cos(theta2));
 337                         adx = fabs(dx);
 338                         ady = fabs(dy);
 339
 340
 341                         dotptr->active = 1;
 342                         dotptr->x = shipx + surf_ship->w/2 + (rnd()-0.5)*3;
 343                         dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*3;
 344
 345                         switch(m) {
 346                                 case 0:
 347                                         dotptr->x -= 14;
 348                                         dotptr->dx = -20*adx + shipdx;
 349                                         dotptr->dy = 2*dy + shipdy;
 350                                         dotptr->life = 60 * adx;
 351                                 break;
 352                                 case 1:
 353                                         dotptr->dx = 2*dx + shipdx;
 354                                         dotptr->dy = -20*ady + shipdy;
 355                                         dotptr->life = 60 * ady;
 356                                 break;
 357                                 case 2:
 358                                         dotptr->x += 14;
 359                                         dotptr->dx = 20*adx + shipdx;
 360                                         dotptr->dy = 2*dy + shipdy;
 361                                         dotptr->life = 60 * adx;
 362                                 break;
 363                                 case 3:
 364                                         dotptr->dx = 2*dx + shipdx;
 365                                         dotptr->dy = 20*ady + shipdy;
 366                                         dotptr->life = 60 * ady;
 367                                 break;
 368                         }
 369                         dotptr++;
 370                         if(dotptr-edot >= MAXENGINEDOTS) {
 371                                 dotptr = edot;
 372                         }
 373                 }
 374         }
 375 }
 376
 377 void
 378 drawdots(SDL_Surface *s) {
 379         int m;
 380
 381         // Create more engine dots comin' out da back
 382         if(!gameover) create_engine_dots(200);
 383
 384         // Create engine dots out the side we're moving from
 385         for(m = 0; m<4; m++) {
 386                 if(maneuver & 1<<m) { // 'maneuver' is a bit field
 387                         create_engine_dots2(80,m);
 388                 }
 389         }
 390
 391         SDL_LockSurface(s);
 392         draw_space_dots(s);
 393         draw_engine_dots(s);
 394         draw_bang_dots(s);
 395         SDL_UnlockSurface(s);
 396 }
 397
 398 int
 399 init(int fullscreen) {
 400
 401         int i;
 402         SDL_Surface *temp;
 403         Uint32 flag;
 404
 405         // Where are our data files?
 406         if(!find_files()) exit(1);
 407         read_high_score_table();
 408
 409         if(sound_flag) {
 410                 // Initialize SDL with audio and video
 411                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 412                         sound_flag = 0;
 413                         printf ("Can't open sound, starting without it\n");
 414                         atexit(SDL_Quit);
 415                 } else {
 416                         atexit(SDL_Quit);
 417                         atexit(SDL_CloseAudio);
 418                         sound_flag = init_sound();
 419                 }
 420         } else {
 421                 // Initialize with video only
 422                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 423                 atexit(SDL_Quit);
 424         }
 425
 426         play_tune(0);
 427
 428         // Attempt to get the required video size
 429         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 430         if(fullscreen) flag |= SDL_FULLSCREEN;
 431         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 432
 433         // Set the title bar text
 434         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 435
 436         NULLERROR(surf_screen);
 437
 438         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 439         for(i = 0; i<W*3; i++) {
 440                 heatcolor[i] = SDL_MapRGB(
 441                         surf_screen->format,
 442                         (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?
 443                 );
 444         }
 445
 446         // Load the banners
 447         NULLERROR(temp = IMG_Load(add_path("banners/variations.png")));
 448         NULLERROR(surf_b_variations = SDL_DisplayFormat(temp));
 449
 450         NULLERROR(temp = IMG_Load(add_path("banners/on.png")));
 451         NULLERROR(surf_b_on = SDL_DisplayFormat(temp));
 452
 453         NULLERROR(temp = IMG_Load(add_path("banners/rockdodger.png")));
 454         NULLERROR(surf_b_rockdodger = SDL_DisplayFormat(temp));
 455
 456         NULLERROR(temp = IMG_Load(add_path("banners/game.png")));
 457         NULLERROR(surf_b_game = SDL_DisplayFormat(temp));
 458
 459         NULLERROR(temp = IMG_Load(add_path("banners/over.png")));
 460         NULLERROR(surf_b_over = SDL_DisplayFormat(temp));
 461
 462         surf_font_big = IMG_Load(add_path(BIG_FONT_FILE));
 463         g_font = SFont_InitFont(surf_font_big);
 464
 465         // Load the spaceship graphic.
 466         NULLERROR(temp = IMG_Load(add_path("sprites/ship.png")));
 467         NULLERROR(surf_ship = SDL_DisplayFormat(temp));
 468         get_shape(surf_ship, &shipshape);
 469
 470         // Load the life indicator (small ship) graphic.
 471         NULLERROR(temp = IMG_Load(add_path("indicators/life.png")));
 472         NULLERROR(surf_life = SDL_DisplayFormat(temp));
 473
 474         init_engine_dots();
 475         init_space_dots();
 476
 477         init_rocks();
 478
 479         // Remove the mouse cursor
 480 #ifdef SDL_DISABLE
 481         SDL_ShowCursor(SDL_DISABLE);
 482 #endif
 483
 484         return 0;
 485 }
 486
 487 int
 488 draw() {
 489         int i;
 490         SDL_Rect dest;
 491         int bang, x;
 492         char *text;
 493         float fadegame,fadeover;
 494
 495         bang = 0;
 496
 497         // Draw a fully black background
 498         SDL_FillRect(surf_screen,NULL,0);
 499
 500         // Draw the background dots
 501         drawdots(surf_screen);
 502
 503         // Draw ship
 504         if(!gameover && state == GAMEPLAY ) {
 505                 dest.x = shipx;
 506                 dest.y = shipy;
 507                 SDL_BlitSurface(surf_ship,NULL,surf_screen,&dest);
 508         }
 509
 510         draw_rocks();
 511
 512         // Draw the life indicators.
 513         if(state == GAMEPLAY || state == DEAD_PAUSE || state == GAME_OVER)
 514         for(i = 0; i<nships-1; i++) {
 515                 dest.x = (i + 1)*(surf_life->w + 10);
 516                 dest.y = 20;
 517                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 518         }
 519
 520         // Draw the score
 521         snprintscore_line(topline, 50, score);
 522         SFont_Write(surf_screen, g_font, XSIZE-250, 0, topline);
 523
 524         // If it's game over, show the game over graphic in the dead centre
 525         switch (state) {
 526                 case GAME_OVER:
 527                         if(fadetimer<3.0/faderate) {
 528                                 fadegame = fadetimer/(3.0/faderate);
 529                         } else {
 530                                 fadegame = 1.0;
 531                         }
 532
 533                         if(fadetimer<3.0/faderate) {
 534                                 fadeover = 0.0;
 535                         } else if(fadetimer<6.0/faderate) {
 536                                 fadeover = ((3.0/faderate)-fadetimer)/(6.0/faderate);
 537                         } else {
 538                                 fadeover = 1.0;
 539                         }
 540
 541                         dest.x = (XSIZE-surf_b_game->w)/2;
 542                         dest.y = (YSIZE-surf_b_game->h)/2-40;
 543                         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(fadegame*(200 + 55*cos(fadetimer += gamerate/1.0))));
 544                         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 545
 546                         dest.x = (XSIZE-surf_b_over->w)/2;
 547                         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 548                         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(fadeover*(200 + 55*sin(fadetimer))));
 549                         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 550                 break;
 551
 552                 case TITLE_PAGE:
 553
 554                         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 555                         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 556                         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer += gamerate/2.0)));
 557                         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 558
 559                         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 560                         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 561                         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 562                         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 563
 564                         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 565                         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 566                         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 567                         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 568
 569                         text = "Version " VERSION;
 570                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 571                         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 572
 573                         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 574                         //text = "Press SPACE to start!";
 575                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 576                         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 577                 break;
 578
 579                 case HIGH_SCORE_ENTRY:
 580                         play_tune(2);
 581                         if(!process_score_input()) {  // done inputting name
 582
 583                                 // Change state to briefly show high scores page
 584                                 state = HIGH_SCORE_DISPLAY;
 585                                 state_timeout = 200;
 586
 587                                 // Write the high score table to the file
 588                                 write_high_score_table();
 589
 590                                 // Play the title page tune
 591                                 play_tune(0);
 592                         }
 593                 // FALL THROUGH TO
 594                 case HIGH_SCORE_DISPLAY:
 595                         // Display de list o high scores mon.
 596                         display_scores(surf_screen, 150,50);
 597                         break;
 598                 case GAMEPLAY:
 599                 case DEAD_PAUSE:
 600                         ; // no action necessary
 601         }
 602
 603         if(!gameover && state == GAMEPLAY) {
 604                 bang = hit_rocks(shipx, shipy, &shipshape);
 605         }
 606
 607         ticks_since_last = SDL_GetTicks()-last_ticks;
 608         last_ticks = SDL_GetTicks();
 609         if(ticks_since_last>200 || ticks_since_last<0) {
 610                 gamerate = 0;
 611         }
 612         else {
 613                 gamerate = GAMESPEED*ticks_since_last/50.0;
 614                 if(state == GAMEPLAY) {
 615                         score += ticks_since_last;
 616                 }
 617         }
 618
 619         // Update the surface
 620         SDL_Flip(surf_screen);
 621
 622
 623         return bang;
 624 }
 625
 626 int
 627 gameloop() {
 628         Uint8 *keystate;
 629         float tmp;
 630
 631
 632         for(;;) {
 633                 if(!paused) {
 634                         // Count down the game loop timer, and change state when it gets to zero or less;
 635
 636                         if((state_timeout -= gamerate*3) < 0) {
 637                                 switch(state) {
 638                                         case DEAD_PAUSE:
 639                                                 // Create a new ship and start all over again
 640                                                 state = GAMEPLAY;
 641                                                 play_tune(1);
 642                                                 break;
 643                                         case GAME_OVER:
 644                                                 state = HIGH_SCORE_ENTRY;
 645                                                 state_timeout = 5.0e6;
 646                                                 if(new_high_score(score)) {
 647                                                         SDL_Event e;
 648                                                         SDL_EnableUNICODE(1);
 649                                                         while(SDL_PollEvent(&e))
 650                                                                 ;
 651                                                 } else {
 652                                                         state = HIGH_SCORE_DISPLAY;
 653                                                         state_timeout = 400;
 654                                                 }
 655                                                 break;
 656                                         case HIGH_SCORE_DISPLAY:
 657                                                 state = TITLE_PAGE;
 658                                                 state_timeout = 500.0;
 659                                                 break;
 660                                         case HIGH_SCORE_ENTRY:
 661                                                 // state = TITLE_PAGE;
 662                                                 // play_tune(1);
 663                                                 // state_timeout = 100.0;
 664                                                 break;
 665                                         case TITLE_PAGE:
 666                                                 state = HIGH_SCORE_DISPLAY;
 667                                                 state_timeout = 200.0;
 668                                                 break;
 669                                         case GAMEPLAY:
 670                                                 ; // no action necessary
 671                                 }
 672                         } else {
 673                                 if(state == DEAD_PAUSE) {
 674                                         float blast_radius;
 675                                         int fixonly;
 676
 677                                         if(state_timeout < DEAD_PAUSE_LENGTH - 20.0) {
 678                                                 blast_radius = BLAST_RADIUS * 1.3;
 679                                                 fixonly = 1;
 680                                         } else {
 681                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 682                                                 fixonly = 0;
 683                                         }
 684                                         blast_rocks(bangx, bangy, blast_radius, fixonly);
 685
 686                                         if(bangx < 60) bangx = 60;
 687                                 }
 688                         }
 689
 690                         new_rocks();
 691
 692                         // FRICTION?
 693                         if(friction) {
 694                                 shipdx *= pow((double)0.9,(double)gamerate);
 695                                 shipdy *= pow((double)0.9,(double)gamerate);
 696                         }
 697
 698                         // INERTIA
 699                         shipx += shipdx*gamerate;
 700                         shipy += shipdy*gamerate;
 701
 702                         // SCROLLING
 703                         tmp = shipy - (YSIZE / 2);
 704                         tmp += shipdy * 25;
 705                         tmp /= -25;
 706                         tmp = ((screendy * (gamerate - 12)) + (tmp * gamerate)) / 12;
 707                         screendy = -tmp;
 708                         tmp = shipx - (XSIZE / 3);
 709                         tmp += shipdx * 25;
 710                         tmp /= -25;
 711                         tmp = ((screendx * (gamerate - 12)) + (tmp * gamerate)) / 12;
 712                         screendx = -tmp;
 713                         if(screendx < 7.5) screendx=7.5;
 714
 715                         xscroll = screendx * gamerate;
 716                         yscroll = screendy * gamerate;
 717                         shipx -= xscroll;
 718                         shipy -= yscroll;
 719
 720                         // move bang center
 721                         bangx += bangdx*gamerate - xscroll;
 722                         bangy += bangdy*gamerate - yscroll;
 723
 724                         move_rocks();
 725
 726
 727                         // BOUNCE X
 728                         if(shipx<0 || shipx>XSIZE-surf_ship->w) {
 729                                 // BOUNCE from left and right wall
 730                                 shipx -= (shipdx-screendx)*gamerate;
 731                                 shipdx = 2*screendx-shipdx;
 732                         }
 733
 734                         // BOUNCE Y
 735                         if(shipy<0 || shipy>YSIZE-surf_ship->h) {
 736                                 // BOUNCE from top and bottom wall
 737                                 shipy -= (shipdy-screendy)*gamerate;
 738                                 shipdy = 2*screendy-shipdy;
 739                         }
 740
 741
 742                         if(draw() && state == GAMEPLAY) {
 743                                 // Died
 744                                 play_sound(0); // Play the explosion sound
 745                                 bangx = shipx; bangy = shipy; bangdx = shipdx; bangdy = shipdy;
 746                                 make_bang_dots(shipx,shipy,shipdx,shipdy,surf_ship,30);
 747                                 shipdx *= 0.5; shipdy *= 0.5;
 748                                 if(--nships <= 0) {
 749                                         state = GAME_OVER;
 750                                         gameover = 1;
 751                                         shipdx = 8; shipdy = 0;
 752                                         state_timeout = 200.0;
 753                                         fadetimer = 0.0;
 754                                         faderate = gamerate;
 755                                 }
 756                                 else {
 757                                         state = DEAD_PAUSE;
 758                                         state_timeout = DEAD_PAUSE_LENGTH;
 759                                 }
 760                         }
 761
 762                         SDL_PumpEvents();
 763                         keystate = SDL_GetKeyState(NULL);
 764
 765                         // new game
 766                         if(keystate[SDLK_SPACE] && (state == HIGH_SCORE_DISPLAY || state == TITLE_PAGE)) {
 767
 768                                 reset_rocks();
 769
 770                                 game_ticks = 0;
 771
 772                                 nships = 4;
 773                                 score = 0;
 774
 775                                 state = GAMEPLAY;
 776                                 play_tune(1);
 777
 778                                 gameover = 0;
 779                                 shipx = XSIZE/2.2; shipy = YSIZE/2;
 780                                 shipdx = screendx; shipdy = screendy;
 781                         }
 782
 783                         maneuver = 0;
 784                 } else {
 785                         SDL_PumpEvents();
 786                         keystate = SDL_GetKeyState(NULL);
 787                 }
 788
 789                 if(state == GAMEPLAY) {
 790                         if(!gameover) {
 791
 792                                 if(!paused) {
 793                                         if(keystate[SDLK_UP] | keystate[SDLK_c])                { shipdy -= 1.5*gamerate; maneuver |= 1<<3;}
 794                                         if(keystate[SDLK_DOWN] | keystate[SDLK_t])              { shipdy += 1.5*gamerate; maneuver |= 1<<1;}
 795                                         if(keystate[SDLK_LEFT] | keystate[SDLK_h])              { shipdx -= 1.5*gamerate; maneuver |= 1<<2;}
 796                                         if(keystate[SDLK_RIGHT] | keystate[SDLK_n])             { shipdx += 1.5*gamerate; maneuver |= 1;}
 797                                         if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 798                                 }
 799
 800                                 if(keystate[SDLK_p] | keystate[SDLK_s]) {
 801                                         if(!pausedown) {
 802                                                 paused = !paused;
 803                                                 pausedown = 1;
 804                                         }
 805                                 } else {
 806                                         pausedown = 0;
 807                                 }
 808
 809                         }
 810                         else {
 811                                 paused = 0;
 812                                 pausedown = 0;
 813                         }
 814                 } else if(state == GAME_OVER) {
 815                         if(keystate[SDLK_SPACE]) {
 816                                 state_timeout = -1;
 817                         }
 818                 }
 819
 820                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE])) {
 821                         return 0;
 822                 }
 823
 824         }
 825 }
 826
 827 int
 828 main(int argc, char **argv) {
 829         int x, fullscreen;
 830
 831         fullscreen = 0;
 832         tail_plume = 0;
 833         friction = 0;
 834         sound_flag = 1;
 835         music_flag = 0;
 836
 837         while ((x = getopt(argc,argv,"efhmps")) >= 0) {
 838                 switch(x) {
 839                         case 'e': // engine
 840                                 tail_plume = 1;
 841                         break;
 842                         case 'f': // fullscreen
 843                                 fullscreen = 1;
 844                         break;
 845                         case 'h': // help
 846                                 printf("Variations on RockDodger\n"
 847                                        " -e big tail [E]ngine\n"
 848                                        " -f [F]ull screen\n"
 849                                        " -h this [H]elp message\n"
 850                                        " -m enable [M]usic\n"
 851                                        " -p original [P]hysics (friction)\n"
 852                                        " -s [S]ilent (no sound)\n");
 853                                 exit(0);
 854                         break;
 855                         case 'm': // music
 856                                 music_flag = 1;
 857                         case 'p': // physics
 858                                 friction = 1;
 859                         break;
 860                         case 's': // silent
 861                                 sound_flag = 0;
 862                                 music_flag = 0;
 863                         break;
 864                 }
 865         }
 866
 867         if(init(fullscreen)) {
 868                 printf ("ta: '%s'\n",initerror);
 869                 return 1;
 870         }
 871
 872         reset_rocks();
 873         gameloop();
 874
 875         return 0;
 876 }