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 "dust.h"
  41 #include "file.h"
  42 #include "globals.h"
  43 #include "mt.h"
  44 #include "rocks.h"
  45 #include "score.h"
  46 #include "shape.h"
  47 #include "sound.h"
  48
  49 // ************************************* VARS
  50 // SDL_Surface global variables
  51 SDL_Surface
  52         *surf_screen,   // Screen
  53         *surf_b_variations, // "variations" banner
  54         *surf_b_on, // "on" banner
  55         *surf_b_rockdodger, // "rockdodger" banner
  56         *surf_b_game,   // Title element "game"
  57         *surf_b_over,   // Title element "over"
  58         *surf_ship,             // Spaceship element
  59         *surf_life,     // Indicator of number of ships remaining
  60         *surf_rock[NROCKS],     // THE ROCKS
  61         *surf_font_big; // The big font
  62
  63
  64 SFont_Font *g_font;
  65
  66 // Structure global variables
  67 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
  68 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
  69
  70 // Other global variables
  71 char topline[1024];
  72 char *initerror = "";
  73
  74
  75
  76 struct shape shipshape;
  77 float shipx = XSIZE/2, shipy = YSIZE/2; // X position, 0..XSIZE
  78 float shipdx = SCREENDXMIN, shipdy = 0.0;       // Change in X position per tick.
  79 float screendx = SCREENDXMIN, screendy = 0.0;
  80 float xscroll, yscroll;
  81 float back_dist;
  82
  83 // all movement is based on t_frame.
  84 float t_frame;  // length of this frame (in ticks = 1/20th second)
  85 float s_frame;  // length of this frame (seconds)
  86 int ms_frame;   // length of this frame (milliseconds)
  87 int ms_end;     // end of this frame (milliseconds)
  88
  89 float bangx, bangy, bangdx, bangdy;
  90
  91 int nships,score;
  92 int gameover;
  93 int jets = 0;
  94
  95 float fadetimer = 0, faderate;
  96
  97 int pausedown = 0, paused = 0;
  98
  99 // bangdot start (bd1) and end (bd2) position:
 100 int bd1 = 0, bd2 = 0;
 101
 102 enum states {
 103         TITLE_PAGE,
 104         GAMEPLAY,
 105         DEAD_PAUSE,
 106         GAME_OVER,
 107         HIGH_SCORE_ENTRY,
 108         HIGH_SCORE_DISPLAY
 109 };
 110 enum states state = TITLE_PAGE;
 111 float state_timeout = 600.0;
 112
 113 #define NSEQUENCE 2
 114 char *sequence[] = {
 115         "Press SPACE to start",
 116         "http://herkamire.com/jason/vor"
 117 };
 118
 119 int bangdotlife, nbangdots;
 120 Uint16 heatcolor[W*3];
 121
 122 char *data_dir;
 123 extern char *optarg;
 124 extern int optind, opterr, optopt;
 125
 126 #define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
 127
 128 // ************************************* FUNCS
 129
 130 void
 131 init_engine_dots() {
 132         int i;
 133         for(i = 0; i<MAXENGINEDOTS; i++) {
 134                 edot[i].active = 0;
 135         }
 136 }
 137
 138 void
 139 new_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s, int power)
 140 {
 141         int x,y,endcount;
 142         Uint16 *rawpixel,c;
 143         double theta,r;
 144         int begin_generate;
 145
 146         begin_generate = SDL_GetTicks();
 147
 148         SDL_LockSurface(s);
 149         rawpixel = (Uint16 *) s->pixels;
 150
 151         //for(n = 0; n <= power/2; n++) {
 152
 153         endcount = 0;
 154         while (endcount<3) {
 155                 for(x = 0; x<s->w; x++) {
 156                         for(y = 0; y<s->h; y++) {
 157                                 c = rawpixel[s->pitch/2*y + x];
 158                                 if(c && c != s->format->colorkey) {
 159
 160                                         theta = frnd()*M_PI*2;
 161
 162                                         r = 1-(frnd()*frnd());
 163
 164                                         bdot[bd2].dx = (power/50.0)*45.0*cos(theta)*r + dx;
 165                                         bdot[bd2].dy = (power/50.0)*45.0*sin(theta)*r + dy;
 166                                         bdot[bd2].x = x + xbang;
 167                                         bdot[bd2].y = y + ybang;
 168
 169                                         // Replace the last few bang dots with the pixels from the exploding object
 170                                         bdot[bd2].c = (endcount>0)?c:0;
 171                                         bdot[bd2].life = 100;
 172                                         bdot[bd2].decay = frnd()*3 + 1;
 173                                         bdot[bd2].active = 1;
 174
 175                                         bd2++;
 176                                         bd2 %= MAXBANGDOTS;
 177
 178                                         // If the circular buffer is filled, who cares? They've had their chance.
 179                                         //if(bd2 == bd1-1) goto exitloop;
 180
 181                                 }
 182                         }
 183                 }
 184
 185                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 186         }
 187
 188         SDL_UnlockSurface(s);
 189
 190 }
 191
 192 void
 193 draw_bang_dots(SDL_Surface *s) {
 194         int i;
 195         int first_i, last_i;
 196         Uint16 *rawpixel;
 197         rawpixel = (Uint16 *) s->pixels;
 198
 199         first_i = -1;
 200         last_i = 0;
 201
 202         for(i = bd1; (bd1 <= bd2)?(i<bd2):(i >= bd1 && i < bd2); last_i = ++i) {
 203
 204                 i %= MAXBANGDOTS;
 205
 206                 if(bdot[i].x <= 0 || bdot[i].x >= XSIZE || bdot[i].y <= 0 || bdot[i].y >= YSIZE) {
 207                         // If the dot has drifted outside the perimeter, kill it
 208                         bdot[i].active = 0;
 209                 }
 210
 211                 if(bdot[i].active) {
 212                         if(first_i < 0)
 213                         first_i = i;
 214                         //last_i = i + 1;
 215                         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)];
 216                         bdot[i].life -= bdot[i].decay;
 217                         bdot[i].x += bdot[i].dx*t_frame - xscroll;
 218                         bdot[i].y += bdot[i].dy*t_frame - yscroll;
 219
 220                         if(bdot[i].life<0)
 221                         bdot[i].active = 0;
 222                 }
 223         }
 224
 225         if(first_i >= 0) {
 226                 bd1 = first_i;
 227                 bd2 = last_i;
 228         }
 229         else {
 230                 bd1 = 0;
 231                 bd2 = 0;
 232         }
 233
 234 }
 235
 236
 237 void
 238 draw_engine_dots(SDL_Surface *s) {
 239         int i;
 240         Uint16 *rawpixel;
 241         rawpixel = (Uint16 *) s->pixels;
 242
 243         for(i = 0; i<MAXENGINEDOTS; i++) {
 244                 if(edot[i].active) {
 245                         edot[i].x += edot[i].dx*t_frame - xscroll;
 246                         edot[i].y += edot[i].dy*t_frame - yscroll;
 247                         if((edot[i].life -= t_frame*3)<0 || edot[i].y<0 || edot[i].y>YSIZE) {
 248                                 edot[i].active = 0;
 249                         } else if(edot[i].x<0 || edot[i].x>XSIZE) {
 250                                 edot[i].active = 0;
 251                         } else {
 252                                 int heatindex;
 253                                 heatindex = edot[i].life * 6;
 254                                 //rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = lifecolor[(int)(edot[i].life)];
 255                                 rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 256                         }
 257                 }
 258         }
 259 }
 260
 261 void
 262 new_engine_dots(int n, int dir) {
 263         int i;
 264         float a, r;  // angle, random length
 265         float dx, dy;
 266         float hx, hy; // half ship width/height.
 267         static const int s[4] = { 2, 1, 0, 1 };
 268
 269         hx = surf_ship->w / 2;
 270         hy = surf_ship->h / 2;
 271
 272         for(i = 0; i<n; i++) {
 273                 if(dotptr->active == 0) {
 274                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 275                         r = sin(frnd()*M_PI);
 276                         dx = r * cos(a);
 277                         dy = r * -sin(a);  // screen y is "backwards".
 278
 279                         dotptr->active = 1;
 280                         dotptr->x = shipx + s[dir]*hx + (frnd()-0.5)*3;
 281                         dotptr->y = shipy + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 282                         if(dir&1) {
 283                                 dotptr->dx = shipdx + 2*dx;
 284                                 dotptr->dy = shipdy + 20*dy;
 285                                 dotptr->life = 60 * fabs(dy);
 286                         } else {
 287                                 dotptr->dx = shipdx + 20*dx;
 288                                 dotptr->dy = shipdy + 2*dy;
 289                                 dotptr->life = 60 * fabs(dx);
 290                         }
 291
 292                         dotptr++;
 293                         if(dotptr-edot >= MAXENGINEDOTS) {
 294                                 dotptr = edot;
 295                         }
 296                 }
 297         }
 298 }
 299
 300 void
 301 drawdots(SDL_Surface *s) {
 302         int m;
 303
 304         // Create engine dots out the side we're moving from
 305         for(m = 0; m<4; m++) {
 306                 if(jets & 1<<m) { // 'jets' is a bit field
 307                         new_engine_dots(80,m);
 308                 }
 309         }
 310
 311         move_dust();
 312
 313         SDL_LockSurface(s);
 314         draw_dust(s);
 315         draw_engine_dots(s);
 316         draw_bang_dots(s);
 317         SDL_UnlockSurface(s);
 318 }
 319
 320 int
 321 init(void) {
 322
 323         int i;
 324         SDL_Surface *temp;
 325         Uint32 flag;
 326
 327         // Where are our data files?
 328         if(!find_files()) exit(1);
 329         read_high_score_table();
 330
 331         if(opt_sound) {
 332                 // Initialize SDL with audio and video
 333                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 334                         opt_sound = 0;
 335                         printf ("Can't open sound, starting without it\n");
 336                         atexit(SDL_Quit);
 337                 } else {
 338                         atexit(SDL_Quit);
 339                         atexit(SDL_CloseAudio);
 340                         opt_sound = init_sound();
 341                 }
 342         } else {
 343                 // Initialize with video only
 344                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 345                 atexit(SDL_Quit);
 346         }
 347
 348         play_tune(TUNE_TITLE_PAGE);
 349
 350         // Attempt to get the required video size
 351         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 352         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 353         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 354
 355         // Set the title bar text
 356         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 357
 358         NULLERROR(surf_screen);
 359
 360         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 361         for(i = 0; i<W*3; i++) {
 362                 heatcolor[i] = SDL_MapRGB(
 363                         surf_screen->format,
 364                         (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?
 365                 );
 366         }
 367
 368         // Load the banners
 369         NULLERROR(temp = IMG_Load(add_path("banners/variations.png")));
 370         NULLERROR(surf_b_variations = SDL_DisplayFormat(temp));
 371
 372         NULLERROR(temp = IMG_Load(add_path("banners/on.png")));
 373         NULLERROR(surf_b_on = SDL_DisplayFormat(temp));
 374
 375         NULLERROR(temp = IMG_Load(add_path("banners/rockdodger.png")));
 376         NULLERROR(surf_b_rockdodger = SDL_DisplayFormat(temp));
 377
 378         NULLERROR(temp = IMG_Load(add_path("banners/game.png")));
 379         NULLERROR(surf_b_game = SDL_DisplayFormat(temp));
 380
 381         NULLERROR(temp = IMG_Load(add_path("banners/over.png")));
 382         NULLERROR(surf_b_over = SDL_DisplayFormat(temp));
 383
 384         surf_font_big = IMG_Load(add_path(BIG_FONT_FILE));
 385         g_font = SFont_InitFont(surf_font_big);
 386
 387         // Load the spaceship graphic.
 388         NULLERROR(temp = IMG_Load(add_path("sprites/ship.png")));
 389         NULLERROR(surf_ship = SDL_DisplayFormat(temp));
 390         get_shape(surf_ship, &shipshape);
 391
 392         // Load the life indicator (small ship) graphic.
 393         NULLERROR(temp = IMG_Load(add_path("indicators/life.png")));
 394         NULLERROR(surf_life = SDL_DisplayFormat(temp));
 395
 396         init_engine_dots();
 397         init_dust();
 398
 399         init_rocks();
 400
 401         // Remove the mouse cursor
 402 #ifdef SDL_DISABLE
 403         SDL_ShowCursor(SDL_DISABLE);
 404 #endif
 405
 406         return 0;
 407 }
 408
 409 int
 410 draw() {
 411         int i;
 412         SDL_Rect dest;
 413         int bang, x;
 414         char *text;
 415         float fadegame,fadeover;
 416
 417         bang = 0;
 418
 419         // Draw a fully black background
 420         SDL_FillRect(surf_screen,NULL,0);
 421
 422         // Draw the background dots
 423         drawdots(surf_screen);
 424
 425         // Draw ship
 426         if(!gameover && state == GAMEPLAY ) {
 427                 dest.x = shipx;
 428                 dest.y = shipy;
 429                 SDL_BlitSurface(surf_ship,NULL,surf_screen,&dest);
 430         }
 431
 432         draw_rocks();
 433
 434         // Draw the life indicators.
 435         if(state == GAMEPLAY || state == DEAD_PAUSE || state == GAME_OVER)
 436         for(i = 0; i<nships-1; i++) {
 437                 dest.x = (i + 1)*(surf_life->w + 10);
 438                 dest.y = 20;
 439                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 440         }
 441
 442         // Draw the score
 443         snprintscore_line(topline, 50, score);
 444         SFont_Write(surf_screen, g_font, XSIZE-250, 0, topline);
 445
 446         // If it's game over, show the game over graphic in the dead centre
 447         switch (state) {
 448                 case GAME_OVER:
 449                         if(fadetimer<3.0/faderate) {
 450                                 fadegame = fadetimer/(3.0/faderate);
 451                         } else {
 452                                 fadegame = 1.0;
 453                         }
 454
 455                         if(fadetimer<3.0/faderate) {
 456                                 fadeover = 0.0;
 457                         } else if(fadetimer<6.0/faderate) {
 458                                 fadeover = ((3.0/faderate)-fadetimer)/(6.0/faderate);
 459                         } else {
 460                                 fadeover = 1.0;
 461                         }
 462
 463                         dest.x = (XSIZE-surf_b_game->w)/2;
 464                         dest.y = (YSIZE-surf_b_game->h)/2-40;
 465                         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(fadegame*(200 + 55*cos(fadetimer += t_frame/1.0))));
 466                         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 467
 468                         dest.x = (XSIZE-surf_b_over->w)/2;
 469                         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 470                         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(fadeover*(200 + 55*sin(fadetimer))));
 471                         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 472                 break;
 473
 474                 case TITLE_PAGE:
 475
 476                         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 477                         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 478                         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer += t_frame/2.0)));
 479                         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 480
 481                         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 482                         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 483                         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 484                         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 485
 486                         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 487                         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 488                         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 489                         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 490
 491                         text = "Version " VERSION;
 492                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 493                         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 494
 495                         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 496                         //text = "Press SPACE to start!";
 497                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 498                         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 499                 break;
 500
 501                 case HIGH_SCORE_ENTRY:
 502                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 503                         if(!process_score_input()) {  // done inputting name
 504
 505                                 // Change state to briefly show high scores page
 506                                 state = HIGH_SCORE_DISPLAY;
 507                                 state_timeout = 200;
 508
 509                                 // Write the high score table to the file
 510                                 write_high_score_table();
 511
 512                                 play_tune(TUNE_TITLE_PAGE);
 513                         }
 514                 // FALL THROUGH TO
 515                 case HIGH_SCORE_DISPLAY:
 516                         // Display de list o high scores mon.
 517                         display_scores(surf_screen, 150,50);
 518                         break;
 519                 case GAMEPLAY:
 520                 case DEAD_PAUSE:
 521                         ; // no action necessary
 522         }
 523
 524         if(!gameover && state == GAMEPLAY) {
 525                 bang = hit_rocks(shipx, shipy, &shipshape);
 526         }
 527
 528         ms_frame = SDL_GetTicks() - ms_end;
 529         ms_end += ms_frame;
 530         if(ms_frame>200 || ms_frame<0) {
 531                 // We won't run at all below 5 frames per second.
 532                 // This also happens if we were paused, grr.
 533                 s_frame = 0;
 534                 ms_frame = 0;
 535         } else {
 536                 s_frame = opt_gamespeed * ms_frame / 1000;
 537                 if(state == GAMEPLAY) score += ms_frame;
 538         }
 539         t_frame = s_frame * 20;
 540
 541         // Update the surface
 542         SDL_Flip(surf_screen);
 543
 544
 545         return bang;
 546 }
 547
 548 int
 549 gameloop() {
 550         Uint8 *keystate;
 551         float tmp;
 552
 553
 554         for(;;) {
 555                 if(!paused) {
 556                         // Count down the game loop timer, and change state when it gets to zero or less;
 557
 558                         if((state_timeout -= t_frame*3) < 0) {
 559                                 switch(state) {
 560                                         case DEAD_PAUSE:
 561                                                 // Create a new ship and start all over again
 562                                                 state = GAMEPLAY;
 563                                                 play_tune(TUNE_GAMEPLAY);
 564                                                 break;
 565                                         case GAME_OVER:
 566                                                 if(new_high_score(score)) {
 567                                                         SDL_Event e;
 568                                                         state = HIGH_SCORE_ENTRY;
 569                                                         state_timeout = 5.0e6;
 570                                                         SDL_EnableUNICODE(1);
 571                                                         while(SDL_PollEvent(&e))
 572                                                                 ;
 573                                                 } else if(!keystate[SDLK_SPACE]) {
 574                                                         state = HIGH_SCORE_DISPLAY;
 575                                                         state_timeout = 400;
 576                                                 }
 577                                                 break;
 578                                         case HIGH_SCORE_DISPLAY:
 579                                                 state = TITLE_PAGE;
 580                                                 state_timeout = 500.0;
 581                                                 break;
 582                                         case HIGH_SCORE_ENTRY:
 583                                                 break;
 584                                         case TITLE_PAGE:
 585                                                 state = HIGH_SCORE_DISPLAY;
 586                                                 state_timeout = 200.0;
 587                                                 break;
 588                                         case GAMEPLAY:
 589                                                 ; // no action necessary
 590                                 }
 591                         } else {
 592                                 if(state == DEAD_PAUSE) {
 593                                         float blast_radius;
 594                                         int fixonly;
 595
 596                                         if(state_timeout < DEAD_PAUSE_LENGTH - 20.0) {
 597                                                 blast_radius = BLAST_RADIUS * 1.3;
 598                                                 fixonly = 1;
 599                                         } else {
 600                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 601                                                 fixonly = 0;
 602                                         }
 603                                         blast_rocks(bangx, bangy, blast_radius, fixonly);
 604
 605                                         if(bangx < 60) bangx = 60;
 606                                 }
 607                         }
 608
 609                         new_rocks();
 610
 611                         // INERTIA
 612                         shipx += shipdx*t_frame;
 613                         shipy += shipdy*t_frame;
 614
 615                         // SCROLLING
 616                         tmp = (shipy-YSCROLLTO)/25 + (shipdy-screendy);
 617                         screendy += tmp * t_frame/12;
 618                         tmp = (shipx-XSCROLLTO)/25 + (shipdx-screendx);
 619                         screendx += tmp * t_frame/12;
 620
 621                         // taper off if we would hit the barrier in under 2 seconds.
 622                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0) {
 623                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 624                         }
 625
 626                         xscroll = screendx * t_frame;
 627                         yscroll = screendy * t_frame;
 628                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 629                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 630
 631                         shipx -= xscroll;
 632                         shipy -= yscroll;
 633
 634                         // move bang center
 635                         bangx += bangdx*t_frame - xscroll;
 636                         bangy += bangdy*t_frame - yscroll;
 637
 638                         move_rocks();
 639
 640
 641                         // BOUNCE X
 642                         if(shipx<0 || shipx>XSIZE-surf_ship->w) {
 643                                 // BOUNCE from left and right wall
 644                                 shipx -= (shipdx-screendx)*t_frame;
 645                                 shipdx = screendx - (shipdx-screendx)*opt_bounciness;
 646                         }
 647
 648                         // BOUNCE Y
 649                         if(shipy<0 || shipy>YSIZE-surf_ship->h) {
 650                                 // BOUNCE from top and bottom wall
 651                                 shipy -= (shipdy-screendy)*t_frame;
 652                                 shipdy = screendy - (shipdy-screendy)*opt_bounciness;
 653                         }
 654
 655
 656                         if(draw() && state == GAMEPLAY) {
 657                                 // Died
 658                                 play_sound(SOUND_BANG); // Play the explosion sound
 659                                 bangx = shipx; bangy = shipy; bangdx = shipdx; bangdy = shipdy;
 660                                 new_bang_dots(shipx,shipy,shipdx,shipdy,surf_ship,30);
 661                                 shipdx *= 0.5; shipdy *= 0.5;
 662                                 if(shipdx < SCREENDXMIN) shipdx = SCREENDXMIN;
 663                                 if(--nships <= 0) {
 664                                         state = GAME_OVER;
 665                                         gameover = 1;
 666                                         shipdx = 8; shipdy = 0;
 667                                         state_timeout = 200.0;
 668                                         fadetimer = 0.0;
 669                                         faderate = t_frame;
 670                                 }
 671                                 else {
 672                                         state = DEAD_PAUSE;
 673                                         state_timeout = DEAD_PAUSE_LENGTH;
 674                                 }
 675                         }
 676
 677                         SDL_PumpEvents();
 678                         keystate = SDL_GetKeyState(NULL);
 679
 680                         // new game
 681                         if(keystate[SDLK_SPACE] && (state == HIGH_SCORE_DISPLAY || state == TITLE_PAGE)) {
 682
 683                                 reset_rocks();
 684
 685                                 nships = 4;
 686                                 score = 0;
 687
 688                                 state = GAMEPLAY;
 689                                 play_tune(TUNE_GAMEPLAY);
 690
 691                                 gameover = 0;
 692                                 shipx = XSIZE/2.2; shipy = YSIZE/2;
 693                                 shipdx = screendx; shipdy = screendy;
 694                         }
 695
 696                         jets = 0;
 697                 } else {
 698                         SDL_PumpEvents();
 699                         keystate = SDL_GetKeyState(NULL);
 700                 }
 701
 702                 if(state == GAMEPLAY) {
 703                         if(!gameover) {
 704
 705                                 if(!paused) {
 706                                         if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { shipdx -= 1.5*t_frame; jets |= 1<<0;}
 707                                         if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { shipdy += 1.5*t_frame; jets |= 1<<1;}
 708                                         if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { shipdx += 1.5*t_frame; jets |= 1<<2;}
 709                                         if(keystate[SDLK_UP]    | keystate[SDLK_c]) { shipdy -= 1.5*t_frame; jets |= 1<<3;}
 710                                         if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 711                                 }
 712
 713                                 if(keystate[SDLK_p] | keystate[SDLK_s]) {
 714                                         if(!pausedown) {
 715                                                 paused = !paused;
 716                                                 pausedown = 1;
 717                                         }
 718                                 } else {
 719                                         pausedown = 0;
 720                                 }
 721
 722                         }
 723                         else {
 724                                 paused = 0;
 725                                 pausedown = 0;
 726                         }
 727                 } else if(state == GAME_OVER) {
 728                         if(keystate[SDLK_SPACE]) {
 729                                 state_timeout = -1;
 730                         }
 731                 }
 732
 733                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE])) {
 734                         return 0;
 735                 }
 736
 737         }
 738 }
 739
 740 int
 741 main(int argc, char **argv) {
 742         init_opts();
 743         argp_parse(&argp, argc, argv, 0, 0, 0);
 744
 745         if(init()) {
 746                 printf ("ta: '%s'\n",initerror);
 747                 return 1;
 748         }
 749
 750         gameloop();
 751
 752         return 0;
 753 }