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 <math.h>
  23 #include <SDL.h>
  24 #include <SDL_image.h>
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "SFont.h"
  31
  32 #include "args.h"
  33 #include "common.h"
  34 #include "config.h"
  35 #include "dust.h"
  36 #include "file.h"
  37 #include "globals.h"
  38 #include "mt.h"
  39 #include "rocks.h"
  40 #include "score.h"
  41 #include "sprite.h"
  42 #include "sound.h"
  43
  44 // ************************************* VARS
  45 // SDL_Surface global variables
  46 SDL_Surface
  47         *surf_screen,   // Screen
  48         *surf_b_variations, // "variations" banner
  49         *surf_b_on, // "on" banner
  50         *surf_b_rockdodger, // "rockdodger" banner
  51         *surf_b_game,   // Title element "game"
  52         *surf_b_over,   // Title element "over"
  53         *surf_life,     // Indicator of number of ships remaining
  54         *surf_rock[NROCKS],     // THE ROCKS
  55         *surf_font_big; // The big font
  56
  57
  58 SFont_Font *g_font;
  59
  60 // Structure global variables
  61 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
  62 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
  63
  64 // Other global variables
  65 char topline[1024];
  66 char *initerror = "";
  67
  68 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, SCREENDXMIN, 0.0 };
  69
  70 float screendx = SCREENDXMIN, screendy = 0.0;
  71 float back_dist;
  72
  73 // all movement is based on t_frame.
  74 float t_frame;  // length of this frame (in ticks = 1/20th second)
  75 int ms_frame;   // length of this frame (milliseconds)
  76 int ms_end;     // end of this frame (milliseconds)
  77
  78 int bang = false;
  79 float bangx, bangy, bangdx, bangdy;
  80
  81 int score;
  82
  83 float fadetimer = 0, faderate;
  84
  85 int pausedown = 0, paused = 0;
  86
  87 // bangdot start (bd1) and end (bd2) position:
  88 int bd1 = 0, bd2 = 0;
  89
  90 enum states {
  91         TITLE_PAGE,
  92         GAMEPLAY,
  93         DEAD_PAUSE,
  94         GAME_OVER,
  95         HIGH_SCORE_ENTRY,
  96         HIGH_SCORE_DISPLAY
  97 };
  98 enum states state = TITLE_PAGE;
  99 float state_timeout = 600.0;
 100
 101 #define NSEQUENCE 3
 102 char *msgs[2][3] = {
 103         {
 104                 "Press SPACE for normal game",
 105                 "Press '1' for easy game",
 106                 "http://jasonwoof.org/vor"
 107         },
 108         {
 109                 "Press SPACE for easy game",
 110                 "Press '2' for normal game",
 111                 "http://jasonwoof.org/vor"
 112         }
 113 };
 114
 115 int bangdotlife, nbangdots;
 116 Uint16 heatcolor[W*3];
 117
 118 char *data_dir;
 119 extern char *optarg;
 120 extern int optind, opterr, optopt;
 121
 122 #define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
 123
 124 // ************************************* FUNCS
 125
 126 void
 127 init_engine_dots() {
 128         int i;
 129         for(i = 0; i<MAXENGINEDOTS; i++) {
 130                 edot[i].active = 0;
 131         }
 132 }
 133
 134 void
 135 new_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s)
 136 {
 137         int x,y,endcount;
 138         uint16_t *pixel,c;
 139         uint32_t colorkey;
 140         int row_inc;
 141         double theta,r;
 142         int begin_generate;
 143
 144         begin_generate = SDL_GetTicks();
 145         pixel = s->pixels;
 146         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 147         colorkey = s->format->colorkey;
 148
 149         SDL_LockSurface(s);
 150
 151         endcount = 0;
 152         while (endcount<3) {
 153                 pixel = s->pixels;
 154                 for(y=0; y<s->h; y++) {
 155                         for(x = 0; x<s->w; x++) {
 156                                 c = *pixel++;
 157                                 if(c && c != colorkey) {
 158                                         theta = frnd()*M_PI*2;
 159                                         r = frnd(); r = 1 - r*r;
 160                                         // r = 1 - frnd()*frnd();
 161
 162                                         bdot[bd2].dx = 45*r*cos(theta) + dx;
 163                                         bdot[bd2].dy = 45*r*sin(theta) + dy;
 164                                         bdot[bd2].x = x + xbang;
 165                                         bdot[bd2].y = y + ybang;
 166                                         bdot[bd2].c = 0;
 167                                         bdot[bd2].life = 100;
 168                                         bdot[bd2].decay = frnd()*3 + 1;
 169                                         bdot[bd2].active = 1;
 170
 171                                         // Replace the last few bang dots with the pixels from the exploding object
 172                                         if(endcount>0) bdot[bd2].c = c;
 173
 174                                         bd2 = (bd2+1) % MAXBANGDOTS;
 175                                 }
 176                                 pixel += row_inc;
 177                         }
 178                 }
 179                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 180         }
 181
 182         SDL_UnlockSurface(s);
 183 }
 184
 185 void
 186 draw_bang_dots(SDL_Surface *s)
 187 {
 188         int i;
 189         int first_i, last_i;
 190         uint16_t *pixels, *pixel, c;
 191         int row_inc = s->pitch/sizeof(uint16_t);
 192         Sprite *hit;
 193
 194         pixels = (uint16_t *) s->pixels;
 195         first_i = -1;
 196         last_i = 0;
 197
 198         for(i=0; i<MAXBANGDOTS; i++) {
 199                 if(!bdot[i].active) continue;
 200
 201                 // decrement life and maybe kill
 202                 bdot[i].life -= bdot[i].decay;
 203                 if(bdot[i].life<0) { bdot[i].active = 0; continue; }
 204
 205                 // move and clip
 206                 bdot[i].x += (bdot[i].dx - screendx)*t_frame;
 207                 bdot[i].y += (bdot[i].dy - screendy)*t_frame;
 208                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 209                         bdot[i].active = 0;
 210                         continue;
 211                 }
 212
 213                 // check collisions
 214                 if((hit = pixel_collides(bdot[i].x, bdot[i].y))) {
 215                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 216                                 bdot[i].active = 0;
 217                                 hit->dx += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dx / sprite_mass(hit);
 218                                 hit->dy += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dy / sprite_mass(hit);
 219                                 continue;
 220                         }
 221                 }
 222
 223                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 224                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 225                 *pixel = c;
 226         }
 227 }
 228
 229
 230 void
 231 new_engine_dots(int n, int dir) {
 232         int i;
 233         float a, r;  // angle, random length
 234         float dx, dy;
 235         float hx, hy; // half ship width/height.
 236         static const int s[4] = { 2, 1, 0, 1 };
 237
 238         hx = ship.image->w / 2;
 239         hy = ship.image->h / 2;
 240
 241         for(i = 0; i<n; i++) {
 242                 if(dotptr->active == 0) {
 243                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 244                         r = sin(frnd()*M_PI);
 245                         dx = r * cos(a);
 246                         dy = r * -sin(a);  // screen y is "backwards".
 247
 248                         dotptr->active = 1;
 249                         dotptr->x = ship.x + s[dir]*hx + (frnd()-0.5)*3;
 250                         dotptr->y = ship.y + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 251                         if(dir&1) {
 252                                 dotptr->dx = ship.dx + 2*dx;
 253                                 dotptr->dy = ship.dy + 20*dy;
 254                                 dotptr->life = 60 * fabs(dy);
 255                         } else {
 256                                 dotptr->dx = ship.dx + 20*dx;
 257                                 dotptr->dy = ship.dy + 2*dy;
 258                                 dotptr->life = 60 * fabs(dx);
 259                         }
 260
 261                         if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 262                         else dotptr = edot;
 263                 }
 264         }
 265 }
 266
 267 void
 268 draw_engine_dots(SDL_Surface *s) {
 269         int i;
 270         uint16_t c;
 271         uint16_t *pixels = (uint16_t *) s->pixels;
 272         int row_inc = s->pitch/sizeof(uint16_t);
 273         int heatindex;
 274         Sprite *hit;
 275
 276         for(i = 0; i<MAXENGINEDOTS; i++) {
 277                 if(!edot[i].active) continue;
 278                 edot[i].x += (edot[i].dx - screendx)*t_frame;
 279                 edot[i].y += (edot[i].dy - screendy)*t_frame;
 280                 edot[i].life -= t_frame*3;
 281                 if(edot[i].life < 0
 282                                 || edot[i].x<0 || edot[i].x >= XSIZE
 283                                 || edot[i].y<0 || edot[i].y >= YSIZE) {
 284                         edot[i].active = 0;
 285                         continue;
 286                 }
 287                 // check collisions
 288                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 289                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 290                                 edot[i].active = 0;
 291                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 292                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 293                                 continue;
 294                         }
 295                 }
 296                 heatindex = edot[i].life * 6;
 297                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 298                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 299         }
 300 }
 301
 302 void
 303 drawdots(SDL_Surface *s) {
 304         int m;
 305
 306         // Create engine dots out the side we're moving from
 307         for(m = 0; m<4; m++) {
 308                 if(ship.jets & 1<<m) { // 'jets' is a bit field
 309                         new_engine_dots(80,m);
 310                 }
 311         }
 312
 313         move_dust();
 314
 315         SDL_LockSurface(s);
 316         draw_dust(s);
 317         draw_engine_dots(s);
 318         draw_bang_dots(s);
 319         SDL_UnlockSurface(s);
 320 }
 321
 322 SDL_Surface *
 323 load_image(char *filename)
 324 {
 325         SDL_Surface *tmp, *img = NULL;
 326         char *s = add_data_path(filename);
 327         if(s) {
 328                 tmp = IMG_Load(s);
 329                 free(s);
 330                 if(tmp) {
 331                         img = SDL_DisplayFormat(tmp);
 332                         SDL_FreeSurface(tmp);
 333                 }
 334         }
 335         return img;
 336 }
 337
 338 void
 339 load_ship(void)
 340 {
 341         load_sprite(SPRITE(&ship), "ship.png");
 342 }
 343
 344 int
 345 init(void) {
 346
 347         int i;
 348         char *s;
 349         Uint32 flag;
 350
 351         // Where are our data files?
 352         if(!find_files()) exit(1);
 353         read_high_score_table();
 354
 355         if(opt_sound) {
 356                 // Initialize SDL with audio and video
 357                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 358                         opt_sound = 0;
 359                         fputs("Can't open sound, starting without it\n", stderr);
 360                         atexit(SDL_Quit);
 361                 } else {
 362                         atexit(SDL_Quit);
 363                         atexit(SDL_CloseAudio);
 364                         opt_sound = init_sound();
 365                 }
 366         } else {
 367                 // Initialize with video only
 368                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 369                 atexit(SDL_Quit);
 370         }
 371
 372         play_tune(TUNE_TITLE_PAGE);
 373
 374         // Attempt to get the required video size
 375         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 376         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 377         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 378
 379         // Set the title bar text
 380         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 381
 382         NULLERROR(surf_screen);
 383
 384         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 385         for(i = 0; i<W*3; i++) {
 386                 heatcolor[i] = SDL_MapRGB(
 387                         surf_screen->format,
 388                         (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?
 389                 );
 390         }
 391
 392         // Load the banners
 393         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 394         NULLERROR(surf_b_on = load_image("b_on.png"));
 395         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 396
 397         NULLERROR(surf_b_game = load_image("b_game.png"));
 398         NULLERROR(surf_b_over = load_image("b_over.png"));
 399
 400         // Load the life indicator (small ship) graphic.
 401         NULLERROR(surf_life = load_image("life.png"));
 402
 403         // Load the font image
 404         s = add_data_path("font.png");
 405         if(s) {
 406                 NULLERROR(surf_font_big = IMG_Load(s));
 407                 free(s);
 408                 g_font = SFont_InitFont(surf_font_big);
 409         }
 410
 411         init_engine_dots();
 412         init_dust();
 413
 414         init_sprites();
 415         add_sprite(SPRITE(&ship));
 416
 417         // Remove the mouse cursor
 418 #ifdef SDL_DISABLE
 419         SDL_ShowCursor(SDL_DISABLE);
 420 #endif
 421
 422         return 0;
 423 }
 424
 425 void
 426 show_lives(void)
 427 {
 428         int i;
 429         SDL_Rect dest;
 430
 431         for(i=0; i<ship.lives-1; i++) {
 432                 dest.x = (i + 1)*(surf_life->w + 10);
 433                 dest.y = 20;
 434                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 435         }
 436 }
 437
 438 void
 439 draw_game_over(void)
 440 {
 441         int x;
 442         char *text0, *text1;
 443         SDL_Rect dest;
 444         float a_game = 0, a_over = 0;
 445
 446         // fade in "GAME", then "OVER".
 447         a_game = min(1.0, faderate*fadetimer/3.0);
 448         if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 449
 450         fadetimer += t_frame;
 451
 452         dest.x = (XSIZE-surf_b_game->w)/2;
 453         dest.y = (YSIZE-surf_b_game->h)/2-40;
 454         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 455         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 456
 457         dest.x = (XSIZE-surf_b_over->w)/2;
 458         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 459         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 460         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 461
 462         if(new_high_score(score)) {
 463                 text0 = "New High Score!";
 464                 text1 = "Press SPACE to continue";
 465         } else {
 466                 text0 = msgs[g_easy][0];
 467                 text1 = msgs[g_easy][1];
 468         }
 469
 470         x = (XSIZE-SFont_TextWidth(g_font,text0))/2 + cos(fadetimer/9)*10;
 471         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 472
 473         x = (XSIZE-SFont_TextWidth(g_font,text1))/2 + sin(fadetimer/9)*10;
 474         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 475 }
 476
 477 void
 478 draw_title_page(void)
 479 {
 480         int x;
 481         char *text;
 482         SDL_Rect dest;
 483
 484         fadetimer += t_frame/2.0;
 485
 486         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 487         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 488         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 489         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 490
 491         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 492         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 493         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 494         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 495
 496         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 497         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 498         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 499         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 500
 501         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 502         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 503         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 504
 505         text = "Version " VERSION;
 506         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 507         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 508 }
 509
 510 void
 511 draw(void) {
 512
 513         SDL_FillRect(surf_screen,NULL,0);  // black background
 514         drawdots(surf_screen);             // background dots
 515         draw_sprite(SPRITE(&ship));
 516         draw_rocks();
 517
 518         show_lives();
 519         show_score();
 520
 521         // If it's game over, show the game over graphic in the dead centre
 522         switch (state) {
 523                 case GAME_OVER: draw_game_over(); break;
 524
 525                 case TITLE_PAGE: draw_title_page(); break;
 526
 527                 case HIGH_SCORE_ENTRY:
 528                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 529                         if(!process_score_input()) {  // done inputting name
 530
 531                                 // Change state to briefly show high scores page
 532                                 state = HIGH_SCORE_DISPLAY;
 533                                 state_timeout = 200;
 534
 535                                 // Write the high score table to the file
 536                                 write_high_score_table();
 537
 538                                 play_tune(TUNE_TITLE_PAGE);
 539                         }
 540                 // FALL THROUGH TO
 541                 case HIGH_SCORE_DISPLAY:
 542                         // Display de list o high scores mon.
 543                         display_scores(surf_screen, 150,50);
 544                         break;
 545                 case GAMEPLAY:
 546                 case DEAD_PAUSE:
 547                         ; // no action necessary
 548         }
 549
 550         collisions();
 551
 552         ms_frame = SDL_GetTicks() - ms_end;
 553         ms_end += ms_frame;
 554         t_frame = opt_gamespeed * ms_frame / 50;
 555         if(state == GAMEPLAY) score += ms_frame;
 556
 557         // Update the surface
 558         SDL_Flip(surf_screen);
 559 }
 560
 561 static inline void
 562 kill_ship(Sprite *ship)
 563 {
 564         ship->flags = MOVE;
 565         bang = true;
 566 }
 567
 568 void
 569 do_collision(Sprite *a, Sprite *b)
 570 {
 571         if(a->type == SHIP) kill_ship(a);
 572         else if (b->type == SHIP) kill_ship(b);
 573         else bounce(a, b);
 574 }
 575
 576 void
 577 init_score_entry(void)
 578 {
 579         SDL_Event e;
 580         state = HIGH_SCORE_ENTRY;
 581         state_timeout = 5.0e6;
 582         SDL_EnableUNICODE(1);
 583         while(SDL_PollEvent(&e))
 584                 ;
 585         insert_score(score);
 586 }
 587
 588 void
 589 gameloop() {
 590         SDL_Event e;
 591         Uint8 *keystate;
 592         float tmp;
 593
 594
 595         for(;;) {
 596                 while(SDL_PollEvent(&e)) {
 597                         if(e.type == SDL_QUIT) return;
 598                 }
 599                 keystate = SDL_GetKeyState(NULL);
 600
 601                 if(!paused) {
 602                         // Count down the game loop timer, and change state when it gets to zero or less;
 603
 604                         if((state_timeout -= t_frame*3) < 0) {
 605                                 switch(state) {
 606                                         case DEAD_PAUSE:
 607                                                 // Restore the ship and continue playing
 608                                                 ship.flags = DRAW|MOVE|COLLIDE;
 609                                                 state = GAMEPLAY;
 610                                                 play_tune(TUNE_GAMEPLAY);
 611                                                 break;
 612                                         case GAME_OVER:
 613                                                 if(new_high_score(score)) init_score_entry();
 614                                                 else {
 615                                                         state = HIGH_SCORE_DISPLAY;
 616                                                         state_timeout = 400;
 617                                                 }
 618                                                 break;
 619                                         case HIGH_SCORE_DISPLAY:
 620                                                 state = TITLE_PAGE;
 621                                                 state_timeout = 600.0;
 622                                                 fadetimer = 0.0;
 623                                                 break;
 624                                         case HIGH_SCORE_ENTRY:
 625                                                 break;
 626                                         case TITLE_PAGE:
 627                                                 state = HIGH_SCORE_DISPLAY;
 628                                                 state_timeout = 200.0;
 629                                                 break;
 630                                         case GAMEPLAY:
 631                                                 ; // no action necessary
 632                                 }
 633                         } else {
 634                                 if(state == DEAD_PAUSE) {
 635                                         if(bangx < 60) bangx = 60;
 636                                 }
 637                         }
 638
 639                         new_rocks();
 640
 641                         // SCROLLING
 642                         tmp = (ship.y+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
 643                         screendy += tmp * t_frame/12;
 644                         tmp = (ship.x+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
 645                         screendx += tmp * t_frame/12;
 646                         // taper off so we don't hit the barrier abruptly.
 647                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 648                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
 649                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 650                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 651                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 652
 653                         // move bang center
 654                         bangx += (bangdx - screendx)*t_frame;
 655                         bangy += (bangdy - screendy)*t_frame;
 656
 657                         move_sprites();
 658
 659
 660                         // BOUNCE off left or right edge of screen
 661                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 662                                 ship.x -= (ship.dx-screendx)*t_frame;
 663                                 ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
 664                         }
 665
 666                         // BOUNCE off top or bottom of screen
 667                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 668                                 ship.y -= (ship.dy-screendy)*t_frame;
 669                                 ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
 670                         }
 671
 672                         draw();
 673
 674                         if(state == GAMEPLAY && bang) {
 675                                 // Died
 676                                 bang = false;
 677                                 play_sound(SOUND_BANG); // Play the explosion sound
 678                                 bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
 679                                 new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
 680
 681                                 if(--ship.lives) {
 682                                         state = DEAD_PAUSE;
 683                                         state_timeout = DEAD_PAUSE_LENGTH;
 684                                         ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
 685                                         ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
 686                                         if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
 687                                 } else {
 688                                         state = GAME_OVER;
 689                                         ship.dx = SCREENDXMIN; ship.dy = 0;
 690                                         state_timeout = 200.0;
 691                                         fadetimer = 0.0;
 692                                         faderate = t_frame;
 693                                 }
 694                         }
 695
 696                         // new game
 697                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 698                            && (state == HIGH_SCORE_DISPLAY
 699                                || state == TITLE_PAGE
 700                                || state == GAME_OVER)) {
 701                                 if(state == GAME_OVER && new_high_score(score))
 702                                         init_score_entry();
 703                                 else {
 704                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 705                                                 g_easy = 0;
 706                                                 initial_rocks = NORMAL_I_ROCKS;
 707                                                 final_rocks = NORMAL_F_ROCKS;
 708                                                 if(opt_gamespeed == EASY_GAMESPEED)
 709                                                         opt_gamespeed = NORMAL_GAMESPEED;
 710                                         } else if(keystate[SDLK_1]) {
 711                                                 g_easy = 1;
 712                                                 initial_rocks = EASY_I_ROCKS;
 713                                                 final_rocks = EASY_F_ROCKS;
 714                                                 opt_gamespeed = EASY_GAMESPEED;
 715                                         }
 716                                         reset_sprites();
 717                                         reset_rocks();
 718                                         screendx = SCREENDXMIN; screendy = 0;
 719
 720                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2;
 721                                         ship.dx = screendx; ship.dy = screendy;
 722                                         ship.lives = 4;
 723                                         ship.flags = MOVE|DRAW|COLLIDE;
 724                                         add_sprite(SPRITE(&ship));
 725
 726                                         score = 0;
 727
 728                                         state = GAMEPLAY;
 729                                         play_tune(TUNE_GAMEPLAY);
 730                                 }
 731                         }
 732
 733                         ship.jets = 0;
 734                 }
 735
 736                 if(state == GAMEPLAY) {
 737                         if(!paused) {
 738                                 if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { ship.dx -= 1.5*t_frame; ship.jets |= 1<<0;}
 739                                 if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { ship.dy += 1.5*t_frame; ship.jets |= 1<<1;}
 740                                 if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { ship.dx += 1.5*t_frame; ship.jets |= 1<<2;}
 741                                 if(keystate[SDLK_UP]    | keystate[SDLK_c]) { ship.dy -= 1.5*t_frame; ship.jets |= 1<<3;}
 742                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 743                         }
 744
 745                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 746                                 if(!pausedown) {
 747                                         paused = !paused;
 748                                         pausedown = 1;
 749                                         if(!paused) ms_end = SDL_GetTicks();
 750                                 }
 751                         } else {
 752                                 pausedown = 0;
 753                         }
 754                 }
 755
 756                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 757                         state = HIGH_SCORE_DISPLAY;
 758                         state_timeout = 400;
 759                 }
 760
 761                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE]))
 762                         return;
 763
 764         }
 765 }
 766
 767 int
 768 main(int argc, char **argv) {
 769         if(!parse_opts(argc, argv)) return 1;
 770
 771         if(init()) {
 772                 printf ("ta: '%s'\n",initerror);
 773                 return 1;
 774         }
 775
 776         gameloop();
 777
 778         return 0;
 779 }