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/SDL.h>
  25 #include <SDL/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 #ifdef DEBUG
  34 #include "debug.h"
  35 #endif
  36
  37 #include "args.h"
  38 #include "common.h"
  39 #include "config.h"
  40 #include "file.h"
  41 #include "globals.h"
  42 #include "rocks.h"
  43 #include "score.h"
  44 #include "shape.h"
  45 #include "sound.h"
  46
  47 // ************************************* VARS
  48 // SDL_Surface global variables
  49 SDL_Surface
  50         *surf_screen,   // Screen
  51         *surf_b_variations, // "variations" banner
  52         *surf_b_on, // "on" banner
  53         *surf_b_rockdodger, // "rockdodger" banner
  54         *surf_b_game,   // Title element "game"
  55         *surf_b_over,   // Title element "over"
  56         *surf_ship,             // Spaceship element
  57         *surf_life,     // Indicator of number of ships remaining
  58         *surf_rock[NROCKS],     // THE ROCKS
  59         *surf_font_big; // The big font
  60
  61
  62 SFont_Font *g_font;
  63
  64 // Structure global variables
  65 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
  66 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
  67 struct spacedot sdot[MAXSPACEDOTS];
  68
  69 // Other global variables
  70 char topline[1024];
  71 char *initerror = "";
  72
  73
  74
  75 struct shape shipshape;
  76 float shipx = XSIZE/2, shipy = YSIZE/2; // X position, 0..XSIZE
  77 float shipdx = SCREENDXMIN, shipdy = 0.0;       // Change in X position per tick.
  78 float screendx = SCREENDXMIN, screendy = 0.0;
  79 float xscroll, yscroll;
  80 float back_dist;
  81 float framelen;  // this controls the speed of everything that moves.
  82
  83 float bangx, bangy, bangdx, bangdy;
  84
  85 int nships,score,ticks_since_last,last_ticks;
  86 int gameover;
  87 int maneuver = 0;
  88
  89 float fadetimer = 0, faderate;
  90
  91 int pausedown = 0, paused = 0;
  92
  93 // bangdot start (bd1) and end (bd2) position:
  94 int bd1 = 0, bd2 = 0;
  95
  96 enum states {
  97         TITLE_PAGE,
  98         GAMEPLAY,
  99         DEAD_PAUSE,
 100         GAME_OVER,
 101         HIGH_SCORE_ENTRY,
 102         HIGH_SCORE_DISPLAY
 103 };
 104 enum states state = TITLE_PAGE;
 105 float state_timeout = 600.0;
 106
 107 #define NSEQUENCE 2
 108 char *sequence[] = {
 109         "Press SPACE to start",
 110         "http://herkamire.com/jason/vor"
 111 };
 112
 113 int bangdotlife, nbangdots;
 114 Uint16 heatcolor[W*3];
 115
 116 char *data_dir;
 117 extern char *optarg;
 118 extern int optind, opterr, optopt;
 119
 120 #define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
 121
 122 // ************************************* FUNCS
 123
 124 float
 125 rnd() {
 126         return (float)random()/(float)RAND_MAX;
 127 }
 128
 129 void
 130 init_engine_dots() {
 131         int i;
 132         for(i = 0; i<MAXENGINEDOTS; i++) {
 133                 edot[i].active = 0;
 134         }
 135 }
 136
 137 void
 138 init_space_dots() {
 139         int i,b;
 140         for(i = 0; i<MAXSPACEDOTS; i++) {
 141                 sdot[i].x = rnd()*(XSIZE-5);
 142                 sdot[i].y = rnd()*(YSIZE-5);
 143                 sdot[i].z = MAXDUSTDEPTH*sqrt(rnd());
 144                 b = (MAXDUSTDEPTH - sdot[i].z) * 255.0 / MAXDUSTDEPTH;
 145                 sdot[i].color = SDL_MapRGB(surf_screen->format, b, b, b);
 146         }
 147 }
 148
 149 void
 150 make_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s, int power) {
 151
 152         // TODO - stop generating dots after a certain amount of time has passed, to cope with slower CPUs.
 153         // TODO - generate and display dots in a circular buffer
 154
 155         int x,y,endcount;
 156         Uint16 *rawpixel,c;
 157         double theta,r;
 158         int begin_generate;
 159
 160         begin_generate = SDL_GetTicks();
 161
 162         SDL_LockSurface(s);
 163         rawpixel = (Uint16 *) s->pixels;
 164
 165         //for(n = 0; n <= power/2; n++) {
 166
 167         endcount = 0;
 168         while (endcount<3) {
 169                 for(x = 0; x<s->w; x++) {
 170                         for(y = 0; y<s->h; y++) {
 171                                 c = rawpixel[s->pitch/2*y + x];
 172                                 if(c && c != s->format->colorkey) {
 173
 174                                         theta = rnd()*M_PI*2;
 175
 176                                         r = 1-(rnd()*rnd());
 177
 178                                         bdot[bd2].dx = (power/50.0)*45.0*cos(theta)*r + dx;
 179                                         bdot[bd2].dy = (power/50.0)*45.0*sin(theta)*r + dy;
 180                                         bdot[bd2].x = x + xbang;
 181                                         bdot[bd2].y = y + ybang;
 182
 183                                         // Replace the last few bang dots with the pixels from the exploding object
 184                                         bdot[bd2].c = (endcount>0)?c:0;
 185                                         bdot[bd2].life = 100;
 186                                         bdot[bd2].decay = rnd()*3 + 1;
 187                                         bdot[bd2].active = 1;
 188
 189                                         bd2++;
 190                                         bd2 %= MAXBANGDOTS;
 191
 192                                         // If the circular buffer is filled, who cares? They've had their chance.
 193                                         //if(bd2 == bd1-1) goto exitloop;
 194
 195                                 }
 196                         }
 197                 }
 198
 199                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 200         }
 201
 202         SDL_UnlockSurface(s);
 203
 204 }
 205
 206 void
 207 draw_bang_dots(SDL_Surface *s) {
 208         int i;
 209         int first_i, last_i;
 210         Uint16 *rawpixel;
 211         rawpixel = (Uint16 *) s->pixels;
 212
 213         first_i = -1;
 214         last_i = 0;
 215
 216         for(i = bd1; (bd1 <= bd2)?(i<bd2):(i >= bd1 && i < bd2); last_i = ++i) {
 217
 218                 i %= MAXBANGDOTS;
 219
 220                 if(bdot[i].x <= 0 || bdot[i].x >= XSIZE || bdot[i].y <= 0 || bdot[i].y >= YSIZE) {
 221                         // If the dot has drifted outside the perimeter, kill it
 222                         bdot[i].active = 0;
 223                 }
 224
 225                 if(bdot[i].active) {
 226                         if(first_i < 0)
 227                         first_i = i;
 228                         //last_i = i + 1;
 229                         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)];
 230                         bdot[i].life -= bdot[i].decay;
 231                         bdot[i].x += bdot[i].dx*framelen - xscroll;
 232                         bdot[i].y += bdot[i].dy*framelen - yscroll;
 233
 234                         if(bdot[i].life<0)
 235                         bdot[i].active = 0;
 236                 }
 237         }
 238
 239         if(first_i >= 0) {
 240                 bd1 = first_i;
 241                 bd2 = last_i;
 242         }
 243         else {
 244                 bd1 = 0;
 245                 bd2 = 0;
 246         }
 247
 248 }
 249
 250
 251 void
 252 draw_space_dots(SDL_Surface *s) {
 253         int i;
 254         Uint16 *rawpixel;
 255         rawpixel = (Uint16 *) s->pixels;
 256
 257         for(i = 0; i<MAXSPACEDOTS; i++) {
 258                 if(sdot[i].y<0) {
 259                         sdot[i].y = 0;
 260                 }
 261                 rawpixel[(int)(s->pitch/2*(int)sdot[i].y) + (int)(sdot[i].x)] = sdot[i].color;
 262                 sdot[i].x -= xscroll / (1.3 + sdot[i].z);
 263                 sdot[i].y -= yscroll / (1.3 + sdot[i].z);
 264                 if(sdot[i].y >= XSIZE) sdot[i].x -= XSIZE;
 265                 else if(sdot[i].x < 0) sdot[i].x = XSIZE-1;
 266                 if(sdot[i].y > YSIZE) sdot[i].y -= YSIZE;
 267                 else if(sdot[i].y < 0) sdot[i].y += YSIZE-1;
 268         }
 269 }
 270
 271 void
 272 draw_engine_dots(SDL_Surface *s) {
 273         int i;
 274         Uint16 *rawpixel;
 275         rawpixel = (Uint16 *) s->pixels;
 276
 277         for(i = 0; i<MAXENGINEDOTS; i++) {
 278                 if(edot[i].active) {
 279                         edot[i].x += edot[i].dx*framelen - xscroll;
 280                         edot[i].y += edot[i].dy*framelen - yscroll;
 281                         if((edot[i].life -= framelen*3)<0 || edot[i].y<0 || edot[i].y>YSIZE) {
 282                                 edot[i].active = 0;
 283                         } else if(edot[i].x<0 || edot[i].x>XSIZE) {
 284                                 edot[i].active = 0;
 285                         } else {
 286                                 int heatindex;
 287                                 heatindex = edot[i].life * 6;
 288                                 //rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = lifecolor[(int)(edot[i].life)];
 289                                 rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 290                         }
 291                 }
 292         }
 293 }
 294
 295 void
 296 create_engine_dots(int newdots) {
 297         int i;
 298         double theta,r,dx,dy;
 299
 300         if(!opt_tail_engine) return;
 301
 302         if(state == GAMEPLAY) {
 303                 for(i = 0; i<newdots*framelen; i++) {
 304                         if(dotptr->active == 0) {
 305                                 theta = rnd()*M_PI*2;
 306                                 r = rnd();
 307                                 dx = cos(theta)*r;
 308                                 dy = sin(theta)*r;
 309
 310                                 dotptr->active = 1;
 311                                 dotptr->x = shipx + surf_ship->w/2-14;
 312                                 dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*5-1;
 313                                 dotptr->dx = 10*(dx-1.5) + shipdx;
 314                                 dotptr->dy = 1*dy + shipdy;
 315                                 dotptr->life = 45 + rnd(1)*5;
 316
 317                                 dotptr++;
 318                                 if(dotptr-edot >= MAXENGINEDOTS) {
 319                                         dotptr = edot;
 320                                 }
 321                         }
 322                 }
 323         }
 324 }
 325
 326 void
 327 create_engine_dots2(int newdots, int m) {
 328         int i;
 329         double theta, theta2, dx, dy, adx, ady;
 330
 331         // Don't create fresh engine dots when
 332         // the game is not being played and a demo is not beng shown
 333         if(state != GAMEPLAY) return;
 334
 335         for(i = 0; i<newdots; i++) {
 336                 if(dotptr->active == 0) {
 337                         theta = rnd()*M_PI*2;
 338                         theta2 = rnd()*M_PI*2;
 339
 340                         dx = cos(theta) * fabs(cos(theta2));
 341                         dy = sin(theta) * fabs(cos(theta2));
 342                         adx = fabs(dx);
 343                         ady = fabs(dy);
 344
 345
 346                         dotptr->active = 1;
 347                         dotptr->x = shipx + surf_ship->w/2 + (rnd()-0.5)*3;
 348                         dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*3;
 349
 350                         switch(m) {
 351                                 case 0:
 352                                         dotptr->x -= 14;
 353                                         dotptr->dx = -20*adx + shipdx;
 354                                         dotptr->dy = 2*dy + shipdy;
 355                                         dotptr->life = 60 * adx;
 356                                 break;
 357                                 case 1:
 358                                         dotptr->dx = 2*dx + shipdx;
 359                                         dotptr->dy = -20*ady + shipdy;
 360                                         dotptr->life = 60 * ady;
 361                                 break;
 362                                 case 2:
 363                                         dotptr->x += 14;
 364                                         dotptr->dx = 20*adx + shipdx;
 365                                         dotptr->dy = 2*dy + shipdy;
 366                                         dotptr->life = 60 * adx;
 367                                 break;
 368                                 case 3:
 369                                         dotptr->dx = 2*dx + shipdx;
 370                                         dotptr->dy = 20*ady + shipdy;
 371                                         dotptr->life = 60 * ady;
 372                                 break;
 373                         }
 374                         dotptr++;
 375                         if(dotptr-edot >= MAXENGINEDOTS) {
 376                                 dotptr = edot;
 377                         }
 378                 }
 379         }
 380 }
 381
 382 void
 383 drawdots(SDL_Surface *s) {
 384         int m;
 385
 386         // Create more engine dots comin' out da back
 387         if(!gameover) create_engine_dots(200);
 388
 389         // Create engine dots out the side we're moving from
 390         for(m = 0; m<4; m++) {
 391                 if(maneuver & 1<<m) { // 'maneuver' is a bit field
 392                         create_engine_dots2(80,m);
 393                 }
 394         }
 395
 396         SDL_LockSurface(s);
 397         draw_space_dots(s);
 398         draw_engine_dots(s);
 399         draw_bang_dots(s);
 400         SDL_UnlockSurface(s);
 401 }
 402
 403 int
 404 init(void) {
 405
 406         int i;
 407         SDL_Surface *temp;
 408         Uint32 flag;
 409
 410         // Where are our data files?
 411         if(!find_files()) exit(1);
 412         read_high_score_table();
 413
 414         if(opt_sound) {
 415                 // Initialize SDL with audio and video
 416                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 417                         opt_sound = 0;
 418                         printf ("Can't open sound, starting without it\n");
 419                         atexit(SDL_Quit);
 420                 } else {
 421                         atexit(SDL_Quit);
 422                         atexit(SDL_CloseAudio);
 423                         opt_sound = init_sound();
 424                 }
 425         } else {
 426                 // Initialize with video only
 427                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 428                 atexit(SDL_Quit);
 429         }
 430
 431         play_tune(0);
 432
 433         // Attempt to get the required video size
 434         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 435         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 436         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 437
 438         // Set the title bar text
 439         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 440
 441         NULLERROR(surf_screen);
 442
 443         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 444         for(i = 0; i<W*3; i++) {
 445                 heatcolor[i] = SDL_MapRGB(
 446                         surf_screen->format,
 447                         (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?
 448                 );
 449         }
 450
 451         // Load the banners
 452         NULLERROR(temp = IMG_Load(add_path("banners/variations.png")));
 453         NULLERROR(surf_b_variations = SDL_DisplayFormat(temp));
 454
 455         NULLERROR(temp = IMG_Load(add_path("banners/on.png")));
 456         NULLERROR(surf_b_on = SDL_DisplayFormat(temp));
 457
 458         NULLERROR(temp = IMG_Load(add_path("banners/rockdodger.png")));
 459         NULLERROR(surf_b_rockdodger = SDL_DisplayFormat(temp));
 460
 461         NULLERROR(temp = IMG_Load(add_path("banners/game.png")));
 462         NULLERROR(surf_b_game = SDL_DisplayFormat(temp));
 463
 464         NULLERROR(temp = IMG_Load(add_path("banners/over.png")));
 465         NULLERROR(surf_b_over = SDL_DisplayFormat(temp));
 466
 467         surf_font_big = IMG_Load(add_path(BIG_FONT_FILE));
 468         g_font = SFont_InitFont(surf_font_big);
 469
 470         // Load the spaceship graphic.
 471         NULLERROR(temp = IMG_Load(add_path("sprites/ship.png")));
 472         NULLERROR(surf_ship = SDL_DisplayFormat(temp));
 473         get_shape(surf_ship, &shipshape);
 474
 475         // Load the life indicator (small ship) graphic.
 476         NULLERROR(temp = IMG_Load(add_path("indicators/life.png")));
 477         NULLERROR(surf_life = SDL_DisplayFormat(temp));
 478
 479         init_engine_dots();
 480         init_space_dots();
 481
 482         init_rocks();
 483
 484         // Remove the mouse cursor
 485 #ifdef SDL_DISABLE
 486         SDL_ShowCursor(SDL_DISABLE);
 487 #endif
 488
 489         return 0;
 490 }
 491
 492 int
 493 draw() {
 494         int i;
 495         SDL_Rect dest;
 496         int bang, x;
 497         char *text;
 498         float fadegame,fadeover;
 499
 500         bang = 0;
 501
 502         // Draw a fully black background
 503         SDL_FillRect(surf_screen,NULL,0);
 504
 505         // Draw the background dots
 506         drawdots(surf_screen);
 507
 508         // Draw ship
 509         if(!gameover && state == GAMEPLAY ) {
 510                 dest.x = shipx;
 511                 dest.y = shipy;
 512                 SDL_BlitSurface(surf_ship,NULL,surf_screen,&dest);
 513         }
 514
 515         draw_rocks();
 516
 517         // Draw the life indicators.
 518         if(state == GAMEPLAY || state == DEAD_PAUSE || state == GAME_OVER)
 519         for(i = 0; i<nships-1; i++) {
 520                 dest.x = (i + 1)*(surf_life->w + 10);
 521                 dest.y = 20;
 522                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 523         }
 524
 525         // Draw the score
 526         snprintscore_line(topline, 50, score);
 527         SFont_Write(surf_screen, g_font, XSIZE-250, 0, topline);
 528
 529         // If it's game over, show the game over graphic in the dead centre
 530         switch (state) {
 531                 case GAME_OVER:
 532                         if(fadetimer<3.0/faderate) {
 533                                 fadegame = fadetimer/(3.0/faderate);
 534                         } else {
 535                                 fadegame = 1.0;
 536                         }
 537
 538                         if(fadetimer<3.0/faderate) {
 539                                 fadeover = 0.0;
 540                         } else if(fadetimer<6.0/faderate) {
 541                                 fadeover = ((3.0/faderate)-fadetimer)/(6.0/faderate);
 542                         } else {
 543                                 fadeover = 1.0;
 544                         }
 545
 546                         dest.x = (XSIZE-surf_b_game->w)/2;
 547                         dest.y = (YSIZE-surf_b_game->h)/2-40;
 548                         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(fadegame*(200 + 55*cos(fadetimer += framelen/1.0))));
 549                         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 550
 551                         dest.x = (XSIZE-surf_b_over->w)/2;
 552                         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 553                         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(fadeover*(200 + 55*sin(fadetimer))));
 554                         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 555                 break;
 556
 557                 case TITLE_PAGE:
 558
 559                         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 560                         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 561                         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer += framelen/2.0)));
 562                         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 563
 564                         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 565                         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 566                         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 567                         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 568
 569                         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 570                         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 571                         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 572                         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 573
 574                         text = "Version " VERSION;
 575                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 576                         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 577
 578                         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 579                         //text = "Press SPACE to start!";
 580                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 581                         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 582                 break;
 583
 584                 case HIGH_SCORE_ENTRY:
 585                         play_tune(2);
 586                         if(!process_score_input()) {  // done inputting name
 587
 588                                 // Change state to briefly show high scores page
 589                                 state = HIGH_SCORE_DISPLAY;
 590                                 state_timeout = 200;
 591
 592                                 // Write the high score table to the file
 593                                 write_high_score_table();
 594
 595                                 // Play the title page tune
 596                                 play_tune(0);
 597                         }
 598                 // FALL THROUGH TO
 599                 case HIGH_SCORE_DISPLAY:
 600                         // Display de list o high scores mon.
 601                         display_scores(surf_screen, 150,50);
 602                         break;
 603                 case GAMEPLAY:
 604                 case DEAD_PAUSE:
 605                         ; // no action necessary
 606         }
 607
 608         if(!gameover && state == GAMEPLAY) {
 609                 bang = hit_rocks(shipx, shipy, &shipshape);
 610         }
 611
 612         ticks_since_last = SDL_GetTicks()-last_ticks;
 613         last_ticks = SDL_GetTicks();
 614         if(ticks_since_last>200 || ticks_since_last<0) {
 615                 // We won't run at all below 5 frames per second.
 616                 framelen = 0;
 617         } else {
 618                 framelen = opt_gamespeed*ticks_since_last/50.0;
 619                 if(state == GAMEPLAY) {
 620                         score += ticks_since_last;
 621                 }
 622         }
 623
 624         // Update the surface
 625         SDL_Flip(surf_screen);
 626
 627
 628         return bang;
 629 }
 630
 631 int
 632 gameloop() {
 633         Uint8 *keystate;
 634         float tmp;
 635
 636
 637         for(;;) {
 638                 if(!paused) {
 639                         // Count down the game loop timer, and change state when it gets to zero or less;
 640
 641                         if((state_timeout -= framelen*3) < 0) {
 642                                 switch(state) {
 643                                         case DEAD_PAUSE:
 644                                                 // Create a new ship and start all over again
 645                                                 state = GAMEPLAY;
 646                                                 play_tune(1);
 647                                                 break;
 648                                         case GAME_OVER:
 649                                                 if(new_high_score(score)) {
 650                                                         SDL_Event e;
 651                                                         state = HIGH_SCORE_ENTRY;
 652                                                         state_timeout = 5.0e6;
 653                                                         SDL_EnableUNICODE(1);
 654                                                         while(SDL_PollEvent(&e))
 655                                                                 ;
 656                                                 } else if(!keystate[SDLK_SPACE]) {
 657                                                         state = HIGH_SCORE_DISPLAY;
 658                                                         state_timeout = 400;
 659                                                 }
 660                                                 break;
 661                                         case HIGH_SCORE_DISPLAY:
 662                                                 state = TITLE_PAGE;
 663                                                 state_timeout = 500.0;
 664                                                 break;
 665                                         case HIGH_SCORE_ENTRY:
 666                                                 // state = TITLE_PAGE;
 667                                                 // play_tune(1);
 668                                                 // state_timeout = 100.0;
 669                                                 break;
 670                                         case TITLE_PAGE:
 671                                                 state = HIGH_SCORE_DISPLAY;
 672                                                 state_timeout = 200.0;
 673                                                 break;
 674                                         case GAMEPLAY:
 675                                                 ; // no action necessary
 676                                 }
 677                         } else {
 678                                 if(state == DEAD_PAUSE) {
 679                                         float blast_radius;
 680                                         int fixonly;
 681
 682                                         if(state_timeout < DEAD_PAUSE_LENGTH - 20.0) {
 683                                                 blast_radius = BLAST_RADIUS * 1.3;
 684                                                 fixonly = 1;
 685                                         } else {
 686                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 687                                                 fixonly = 0;
 688                                         }
 689                                         blast_rocks(bangx, bangy, blast_radius, fixonly);
 690
 691                                         if(bangx < 60) bangx = 60;
 692                                 }
 693                         }
 694
 695                         new_rocks();
 696
 697                         // FRICTION?
 698                         if(opt_friction) {
 699                                 shipdx *= pow((double)0.9,(double)framelen);
 700                                 shipdy *= pow((double)0.9,(double)framelen);
 701                         }
 702
 703                         // INERTIA
 704                         shipx += shipdx*framelen;
 705                         shipy += shipdy*framelen;
 706
 707                         // SCROLLING
 708                         tmp = shipy - (YSIZE / 2);
 709                         tmp += shipdy * 25;
 710                         tmp /= -25;
 711                         tmp = ((screendy * (framelen - 12)) + (tmp * framelen)) / 12;
 712                         screendy = -tmp;
 713                         tmp = shipx - (XSIZE / 3);
 714                         tmp += shipdx * 25;
 715                         tmp /= -25;
 716                         tmp = ((screendx * (framelen - 12)) + (tmp * framelen)) / 12;
 717                         screendx = -tmp;
 718
 719                         // taper off if we would hit the barrier in under 2 seconds.
 720                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0) {
 721                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 722                         }
 723
 724                         xscroll = screendx * framelen;
 725                         yscroll = screendy * framelen;
 726                         back_dist += (screendx - SCREENDXMIN)*framelen;
 727                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 728
 729                         shipx -= xscroll;
 730                         shipy -= yscroll;
 731
 732                         // move bang center
 733                         bangx += bangdx*framelen - xscroll;
 734                         bangy += bangdy*framelen - yscroll;
 735
 736                         move_rocks();
 737
 738
 739                         // BOUNCE X
 740                         if(shipx<0 || shipx>XSIZE-surf_ship->w) {
 741                                 // BOUNCE from left and right wall
 742                                 shipx -= (shipdx-screendx)*framelen;
 743                                 shipdx = screendx - (shipdx-screendx)*opt_bounciness;
 744                         }
 745
 746                         // BOUNCE Y
 747                         if(shipy<0 || shipy>YSIZE-surf_ship->h) {
 748                                 // BOUNCE from top and bottom wall
 749                                 shipy -= (shipdy-screendy)*framelen;
 750                                 shipdy = screendy - (shipdy-screendy)*opt_bounciness;
 751                         }
 752
 753
 754                         if(draw() && state == GAMEPLAY) {
 755                                 // Died
 756                                 play_sound(0); // Play the explosion sound
 757                                 bangx = shipx; bangy = shipy; bangdx = shipdx; bangdy = shipdy;
 758                                 make_bang_dots(shipx,shipy,shipdx,shipdy,surf_ship,30);
 759                                 shipdx *= 0.5; shipdy *= 0.5;
 760                                 if(shipdx < SCREENDXMIN) shipdx = SCREENDXMIN;
 761                                 if(--nships <= 0) {
 762                                         state = GAME_OVER;
 763                                         gameover = 1;
 764                                         shipdx = 8; shipdy = 0;
 765                                         state_timeout = 200.0;
 766                                         fadetimer = 0.0;
 767                                         faderate = framelen;
 768                                 }
 769                                 else {
 770                                         state = DEAD_PAUSE;
 771                                         state_timeout = DEAD_PAUSE_LENGTH;
 772                                 }
 773                         }
 774
 775                         SDL_PumpEvents();
 776                         keystate = SDL_GetKeyState(NULL);
 777
 778                         // new game
 779                         if(keystate[SDLK_SPACE] && (state == HIGH_SCORE_DISPLAY || state == TITLE_PAGE)) {
 780
 781                                 reset_rocks();
 782
 783                                 nships = 4;
 784                                 score = 0;
 785
 786                                 state = GAMEPLAY;
 787                                 play_tune(1);
 788
 789                                 gameover = 0;
 790                                 shipx = XSIZE/2.2; shipy = YSIZE/2;
 791                                 shipdx = screendx; shipdy = screendy;
 792                         }
 793
 794                         maneuver = 0;
 795                 } else {
 796                         SDL_PumpEvents();
 797                         keystate = SDL_GetKeyState(NULL);
 798                 }
 799
 800                 if(state == GAMEPLAY) {
 801                         if(!gameover) {
 802
 803                                 if(!paused) {
 804                                         if(keystate[SDLK_UP] | keystate[SDLK_c])                { shipdy -= 1.5*framelen; maneuver |= 1<<3;}
 805                                         if(keystate[SDLK_DOWN] | keystate[SDLK_t])              { shipdy += 1.5*framelen; maneuver |= 1<<1;}
 806                                         if(keystate[SDLK_LEFT] | keystate[SDLK_h])              { shipdx -= 1.5*framelen; maneuver |= 1<<2;}
 807                                         if(keystate[SDLK_RIGHT] | keystate[SDLK_n])             { shipdx += 1.5*framelen; maneuver |= 1;}
 808                                         if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 809                                 }
 810
 811                                 if(keystate[SDLK_p] | keystate[SDLK_s]) {
 812                                         if(!pausedown) {
 813                                                 paused = !paused;
 814                                                 pausedown = 1;
 815                                         }
 816                                 } else {
 817                                         pausedown = 0;
 818                                 }
 819
 820                         }
 821                         else {
 822                                 paused = 0;
 823                                 pausedown = 0;
 824                         }
 825                 } else if(state == GAME_OVER) {
 826                         if(keystate[SDLK_SPACE]) {
 827                                 state_timeout = -1;
 828                         }
 829                 }
 830
 831                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE])) {
 832                         return 0;
 833                 }
 834
 835         }
 836 }
 837
 838 int
 839 main(int argc, char **argv) {
 840         init_opts();
 841         argp_parse(&argp, argc, argv, 0, 0, 0);
 842
 843         if(init()) {
 844                 printf ("ta: '%s'\n",initerror);
 845                 return 1;
 846         }
 847
 848         reset_rocks();
 849         gameloop();
 850
 851         return 0;
 852 }