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 #ifdef WIN32
  45 #define SDL_SetAlpha(surf, flag, alpha)
  46 #endif
  47
  48 // ************************************* VARS
  49 // SDL_Surface global variables
  50 SDL_Surface
  51         *surf_screen,   // Screen
  52         *surf_b_variations, // "variations" banner
  53         *surf_b_on, // "on" banner
  54         *surf_b_rockdodger, // "rockdodger" banner
  55         *surf_b_game,   // Title element "game"
  56         *surf_b_over,   // Title element "over"
  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
  68 // Other global variables
  69 char topline[1024];
  70 char *initerror = "";
  71
  72 struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, SCREENDXMIN, 0.0 };
  73
  74 float screendx = SCREENDXMIN, screendy = 0.0;
  75 float back_dist;
  76
  77 // all movement is based on t_frame.
  78 float t_frame;  // length of this frame (in ticks = 1/20th second)
  79 int ms_frame;   // length of this frame (milliseconds)
  80 int ms_end;     // end of this frame (milliseconds)
  81
  82 int bang = false;
  83 float bangx, bangy, bangdx, bangdy;
  84
  85 int score;
  86
  87 float fadetimer = 0, faderate;
  88
  89 int pausedown = 0, paused = 0;
  90
  91 // bangdot start (bd1) and end (bd2) position:
  92 int bd1 = 0, bd2 = 0;
  93
  94 enum states {
  95         TITLE_PAGE,
  96         GAMEPLAY,
  97         DEAD_PAUSE,
  98         GAME_OVER,
  99         HIGH_SCORE_ENTRY,
 100         HIGH_SCORE_DISPLAY
 101 };
 102 enum states state = TITLE_PAGE;
 103 float state_timeout = 600.0;
 104
 105 #define NSEQUENCE 3
 106 char *msgs[2][3] = {
 107         {
 108                 "Press SPACE for normal game",
 109                 "Press '1' for easy game",
 110                 "http://jasonwoof.org/vor"
 111         },
 112         {
 113                 "Press SPACE for easy game",
 114                 "Press '2' for normal game",
 115                 "http://jasonwoof.org/vor"
 116         }
 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)
 140 {
 141         int i, x, y;
 142         uint16_t *pixel, c;
 143         uint32_t colorkey;
 144         int row_inc;
 145         double theta, r;
 146
 147         pixel = s->pixels;
 148         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 149         colorkey = s->format->colorkey;
 150
 151         SDL_LockSurface(s);
 152
 153         for(i=0; i<10; i++) {
 154                 pixel = s->pixels;
 155                 for(y=0; y<s->h; y++) {
 156                         for(x = 0; x<s->w; x++) {
 157                                 c = *pixel++;
 158                                 if(c && c != colorkey) {
 159                                         theta = frnd()*M_PI*2;
 160                                         r = frnd(); r = 1 - r*r;
 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(i>6) bdot[bd2].c = c;
 173
 174                                         bd2 = (bd2+1) % MAXBANGDOTS;
 175                                 }
 176                                 pixel += row_inc;
 177                         }
 178                 }
 179         }
 180
 181         SDL_UnlockSurface(s);
 182 }
 183
 184 void
 185 draw_bang_dots(SDL_Surface *s)
 186 {
 187         int i;
 188         int first_i, last_i;
 189         uint16_t *pixels, *pixel, c;
 190         int row_inc = s->pitch/sizeof(uint16_t);
 191         Sprite *hit;
 192
 193         pixels = (uint16_t *) s->pixels;
 194         first_i = -1;
 195         last_i = 0;
 196
 197         for(i=0; i<MAXBANGDOTS; i++) {
 198                 if(!bdot[i].active) continue;
 199
 200                 // decrement life and maybe kill
 201                 bdot[i].life -= bdot[i].decay;
 202                 if(bdot[i].life<0) { bdot[i].active = 0; continue; }
 203
 204                 // move and clip
 205                 bdot[i].x += (bdot[i].dx - screendx)*t_frame;
 206                 bdot[i].y += (bdot[i].dy - screendy)*t_frame;
 207                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 208                         bdot[i].active = 0;
 209                         continue;
 210                 }
 211
 212                 // check collisions
 213                 if((hit = pixel_collides(bdot[i].x, bdot[i].y))) {
 214                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 215                                 bdot[i].active = 0;
 216                                 hit->dx += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dx / sprite_mass(hit);
 217                                 hit->dy += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dy / sprite_mass(hit);
 218                                 continue;
 219                         }
 220                 }
 221
 222                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 223                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 224                 *pixel = c;
 225         }
 226 }
 227
 228
 229 void
 230 new_engine_dots(int n, int dir) {
 231         int i;
 232         float a, r;  // angle, random length
 233         float dx, dy;
 234         float hx, hy; // half ship width/height.
 235         static const int s[4] = { 2, 1, 0, 1 };
 236
 237         hx = ship.image->w / 2;
 238         hy = ship.image->h / 2;
 239
 240         for(i = 0; i<n; i++) {
 241                 if(dotptr->active == 0) {
 242                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 243                         r = sin(frnd()*M_PI);
 244                         dx = r * cos(a);
 245                         dy = r * -sin(a);  // screen y is "backwards".
 246
 247                         dotptr->active = 1;
 248                         dotptr->x = ship.x + s[dir]*hx + (frnd()-0.5)*3;
 249                         dotptr->y = ship.y + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 250                         if(dir&1) {
 251                                 dotptr->dx = ship.dx + 2*dx;
 252                                 dotptr->dy = ship.dy + 20*dy;
 253                                 dotptr->life = 60 * fabs(dy);
 254                         } else {
 255                                 dotptr->dx = ship.dx + 20*dx;
 256                                 dotptr->dy = ship.dy + 2*dy;
 257                                 dotptr->life = 60 * fabs(dx);
 258                         }
 259
 260                         if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 261                         else dotptr = edot;
 262                 }
 263         }
 264 }
 265
 266 void
 267 draw_engine_dots(SDL_Surface *s) {
 268         int i;
 269         uint16_t c;
 270         uint16_t *pixels = (uint16_t *) s->pixels;
 271         int row_inc = s->pitch/sizeof(uint16_t);
 272         int heatindex;
 273         Sprite *hit;
 274
 275         for(i = 0; i<MAXENGINEDOTS; i++) {
 276                 if(!edot[i].active) continue;
 277                 edot[i].x += (edot[i].dx - screendx)*t_frame;
 278                 edot[i].y += (edot[i].dy - screendy)*t_frame;
 279                 edot[i].life -= t_frame*3;
 280                 if(edot[i].life < 0
 281                                 || edot[i].x<0 || edot[i].x >= XSIZE
 282                                 || edot[i].y<0 || edot[i].y >= YSIZE) {
 283                         edot[i].active = 0;
 284                         continue;
 285                 }
 286                 // check collisions
 287                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 288                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 289                                 edot[i].active = 0;
 290                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 291                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 292                                 continue;
 293                         }
 294                 }
 295                 heatindex = edot[i].life * 6;
 296                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 297                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 298         }
 299 }
 300
 301 void
 302 drawdots(SDL_Surface *s) {
 303         int m;
 304
 305         // Create engine dots out the side we're moving from
 306         for(m = 0; m<4; m++) {
 307                 if(ship.jets & 1<<m) { // 'jets' is a bit field
 308                         new_engine_dots(200.0*t_frame,m);
 309                 }
 310         }
 311
 312         move_dust();
 313
 314         SDL_LockSurface(s);
 315         draw_dust(s);
 316         draw_engine_dots(s);
 317         draw_bang_dots(s);
 318         SDL_UnlockSurface(s);
 319 }
 320
 321 SDL_Surface *
 322 load_image(char *filename)
 323 {
 324         SDL_Surface *tmp, *img = NULL;
 325         char *s = add_data_path(filename);
 326         if(s) {
 327                 tmp = IMG_Load(s);
 328                 free(s);
 329                 if(tmp) {
 330                         img = SDL_DisplayFormat(tmp);
 331                         SDL_FreeSurface(tmp);
 332                 }
 333         }
 334         return img;
 335 }
 336
 337 void
 338 load_ship(void)
 339 {
 340         load_sprite(SPRITE(&ship), "ship.png");
 341 }
 342
 343 int
 344 init(void) {
 345
 346         int i;
 347         char *s;
 348         Uint32 flag;
 349
 350         // Where are our data files?
 351         if(!find_files()) exit(1);
 352         read_high_score_table();
 353
 354         if(opt_sound) {
 355                 // Initialize SDL with audio and video
 356                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 357                         opt_sound = 0;
 358                         fputs("Can't open sound, starting without it\n", stderr);
 359                         atexit(SDL_Quit);
 360                 } else {
 361                         atexit(SDL_Quit);
 362                         atexit(SDL_CloseAudio);
 363                         opt_sound = init_sound();
 364                 }
 365         } else {
 366                 // Initialize with video only
 367                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 368                 atexit(SDL_Quit);
 369         }
 370
 371         play_tune(TUNE_TITLE_PAGE);
 372
 373         // Attempt to get the required video size
 374         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 375         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 376         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 377
 378         // Set the title bar text
 379         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 380
 381         NULLERROR(surf_screen);
 382
 383         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 384         for(i = 0; i<W*3; i++) {
 385                 heatcolor[i] = SDL_MapRGB(
 386                         surf_screen->format,
 387                         (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?
 388                 );
 389         }
 390
 391         // Load the banners
 392         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 393         NULLERROR(surf_b_on = load_image("b_on.png"));
 394         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 395
 396         NULLERROR(surf_b_game = load_image("b_game.png"));
 397         NULLERROR(surf_b_over = load_image("b_over.png"));
 398
 399         // Load the life indicator (small ship) graphic.
 400         NULLERROR(surf_life = load_image("life.png"));
 401
 402         // Load the font image
 403         s = add_data_path("font.png");
 404         if(s) {
 405                 NULLERROR(surf_font_big = IMG_Load(s));
 406                 free(s);
 407                 g_font = SFont_InitFont(surf_font_big);
 408         }
 409
 410         init_engine_dots();
 411         init_dust();
 412
 413         init_sprites();
 414         add_sprite(SPRITE(&ship));
 415
 416         // Remove the mouse cursor
 417 #ifdef SDL_DISABLE
 418         SDL_ShowCursor(SDL_DISABLE);
 419 #endif
 420
 421         return 0;
 422 }
 423
 424 void
 425 show_lives(void)
 426 {
 427         int i;
 428         SDL_Rect dest;
 429
 430         for(i=0; i<ship.lives-1; i++) {
 431                 dest.x = (i + 1)*(surf_life->w + 10);
 432                 dest.y = 20;
 433                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 434         }
 435 }
 436
 437 void
 438 draw_game_over(void)
 439 {
 440         int x;
 441         char *text0, *text1;
 442         SDL_Rect dest;
 443         float a_game = 0, a_over = 0;
 444
 445         // fade in "GAME", then "OVER".
 446         a_game = min(1.0, faderate*fadetimer/3.0);
 447         if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 448
 449         fadetimer += t_frame;
 450
 451         dest.x = (XSIZE-surf_b_game->w)/2;
 452         dest.y = (YSIZE-surf_b_game->h)/2-40;
 453         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 454         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 455
 456         dest.x = (XSIZE-surf_b_over->w)/2;
 457         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 458         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 459         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 460
 461         if(new_high_score(score)) {
 462                 text0 = "New High Score!";
 463                 text1 = "Press SPACE to continue";
 464         } else {
 465                 text0 = msgs[g_easy][0];
 466                 text1 = msgs[g_easy][1];
 467         }
 468
 469         x = (XSIZE-SFont_TextWidth(g_font,text0))/2 + cos(fadetimer/9)*10;
 470         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 471
 472         x = (XSIZE-SFont_TextWidth(g_font,text1))/2 + sin(fadetimer/9)*10;
 473         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 474 }
 475
 476 void
 477 draw_title_page(void)
 478 {
 479         int x;
 480         char *text;
 481         SDL_Rect dest;
 482
 483         fadetimer += t_frame/2.0;
 484
 485         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 486         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 487         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 488         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 489
 490         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 491         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 492         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 493         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 494
 495         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 496         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 497         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 498         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 499
 500         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 501         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 502         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 503
 504         text = "Version " VERSION;
 505         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 506         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 507 }
 508
 509 void
 510 draw(void) {
 511
 512         SDL_FillRect(surf_screen,NULL,0);  // black background
 513         drawdots(surf_screen);             // background dots
 514         draw_sprite(SPRITE(&ship));
 515         draw_rocks();
 516
 517         show_lives();
 518         show_score();
 519
 520         // If it's game over, show the game over graphic in the dead centre
 521         switch (state) {
 522                 case GAME_OVER: draw_game_over(); break;
 523
 524                 case TITLE_PAGE: draw_title_page(); break;
 525
 526                 case HIGH_SCORE_ENTRY:
 527                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 528                 // FALL THROUGH TO
 529                 case HIGH_SCORE_DISPLAY:
 530                         // Display de list o high scores mon.
 531                         display_scores(surf_screen, 150,50);
 532                         break;
 533                 case GAMEPLAY:
 534                 case DEAD_PAUSE:
 535                         ; // no action necessary
 536         }
 537
 538         collisions();
 539
 540         ms_frame = SDL_GetTicks() - ms_end;
 541         ms_end += ms_frame;
 542         t_frame = opt_gamespeed * ms_frame / 50;
 543         if(state == GAMEPLAY) score += ms_frame;
 544
 545         // Update the surface
 546         SDL_Flip(surf_screen);
 547 }
 548
 549 static inline void
 550 kill_ship(Sprite *ship)
 551 {
 552         ship->flags = MOVE;
 553         bang = true;
 554 }
 555
 556 void
 557 do_collision(Sprite *a, Sprite *b)
 558 {
 559         if(a->type == SHIP) kill_ship(a);
 560         else if (b->type == SHIP) kill_ship(b);
 561         else bounce(a, b);
 562 }
 563
 564 void
 565 init_score_entry(void)
 566 {
 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         insert_score(score);
 574 }
 575
 576 void
 577 gameloop() {
 578         SDL_Event e;
 579         Uint8 *keystate;
 580         float tmp;
 581
 582
 583         for(;;) {
 584                 while(SDL_PollEvent(&e)) {
 585                         switch(e.type) {
 586                                 case SDL_QUIT: return;
 587                                 case SDL_KEYUP:
 588                                         if(e.key.keysym.sym == SDLK_ESCAPE
 589                                            || e.key.keysym.sym == SDLK_q)
 590                                                 return;
 591                                         break;
 592                                 case SDL_KEYDOWN:
 593                                         if(state == HIGH_SCORE_ENTRY)
 594                                                 if(!process_score_input(&e.key.keysym)) {
 595                                                         // Write the high score table to the file
 596                                                         write_high_score_table();
 597                                                         // continue to display the scores briefly
 598                                                         state = HIGH_SCORE_DISPLAY;
 599                                                         state_timeout = 200;
 600                                                         play_tune(TUNE_TITLE_PAGE);
 601                                                 }
 602                                         break;
 603                         }
 604                 }
 605                 keystate = SDL_GetKeyState(NULL);
 606
 607                 if(!paused) {
 608                         // Count down the game loop timer, and change state when it gets to zero or less;
 609
 610                         if((state_timeout -= t_frame*3) < 0) {
 611                                 switch(state) {
 612                                         case DEAD_PAUSE:
 613                                                 // Restore the ship and continue playing
 614                                                 ship.flags = DRAW|MOVE|COLLIDE;
 615                                                 state = GAMEPLAY;
 616                                                 play_tune(TUNE_GAMEPLAY);
 617                                                 break;
 618                                         case GAME_OVER:
 619                                                 if(new_high_score(score)) init_score_entry();
 620                                                 else {
 621                                                         state = HIGH_SCORE_DISPLAY;
 622                                                         state_timeout = 400;
 623                                                 }
 624                                                 break;
 625                                         case HIGH_SCORE_DISPLAY:
 626                                                 state = TITLE_PAGE;
 627                                                 state_timeout = 600.0;
 628                                                 fadetimer = 0.0;
 629                                                 break;
 630                                         case HIGH_SCORE_ENTRY:
 631                                                 break;
 632                                         case TITLE_PAGE:
 633                                                 state = HIGH_SCORE_DISPLAY;
 634                                                 state_timeout = 200.0;
 635                                                 break;
 636                                         case GAMEPLAY:
 637                                                 ; // no action necessary
 638                                 }
 639                         } else {
 640                                 if(state == DEAD_PAUSE) {
 641                                         if(bangx < 60) bangx = 60;
 642                                 }
 643                         }
 644
 645                         new_rocks();
 646
 647                         // SCROLLING
 648                         tmp = (ship.y+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
 649                         screendy += tmp * t_frame/12;
 650                         tmp = (ship.x+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
 651                         screendx += tmp * t_frame/12;
 652                         // taper off so we don't hit the barrier abruptly.
 653                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 654                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
 655                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 656                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 657                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 658
 659                         // move bang center
 660                         bangx += (bangdx - screendx)*t_frame;
 661                         bangy += (bangdy - screendy)*t_frame;
 662
 663                         move_sprites();
 664
 665
 666                         // BOUNCE off left or right edge of screen
 667                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 668                                 ship.x -= (ship.dx-screendx)*t_frame;
 669                                 ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
 670                         }
 671
 672                         // BOUNCE off top or bottom of screen
 673                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 674                                 ship.y -= (ship.dy-screendy)*t_frame;
 675                                 ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
 676                         }
 677
 678                         draw();
 679
 680                         if(state == GAMEPLAY && bang) {
 681                                 // Died
 682                                 bang = false;
 683                                 play_sound(SOUND_BANG); // Play the explosion sound
 684                                 bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
 685                                 new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
 686
 687                                 if(--ship.lives) {
 688                                         state = DEAD_PAUSE;
 689                                         state_timeout = DEAD_PAUSE_LENGTH;
 690                                         ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
 691                                         ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
 692                                         if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
 693                                 } else {
 694                                         state = GAME_OVER;
 695                                         ship.dx = SCREENDXMIN; ship.dy = 0;
 696                                         state_timeout = 200.0;
 697                                         fadetimer = 0.0;
 698                                         faderate = t_frame;
 699                                 }
 700                         }
 701
 702                         // new game
 703                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 704                            && (state == HIGH_SCORE_DISPLAY
 705                                || state == TITLE_PAGE
 706                                || state == GAME_OVER)) {
 707                                 if(state == GAME_OVER && new_high_score(score))
 708                                         init_score_entry();
 709                                 else {
 710                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 711                                                 g_easy = 0;
 712                                                 initial_rocks = NORMAL_I_ROCKS;
 713                                                 final_rocks = NORMAL_F_ROCKS;
 714                                                 if(opt_gamespeed == EASY_GAMESPEED)
 715                                                         opt_gamespeed = NORMAL_GAMESPEED;
 716                                         } else if(keystate[SDLK_1]) {
 717                                                 g_easy = 1;
 718                                                 initial_rocks = EASY_I_ROCKS;
 719                                                 final_rocks = EASY_F_ROCKS;
 720                                                 opt_gamespeed = EASY_GAMESPEED;
 721                                         }
 722                                         reset_sprites();
 723                                         reset_rocks();
 724                                         screendx = SCREENDXMIN; screendy = 0;
 725
 726                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2;
 727                                         ship.dx = screendx; ship.dy = screendy;
 728                                         ship.lives = 4;
 729                                         ship.flags = MOVE|DRAW|COLLIDE;
 730                                         add_sprite(SPRITE(&ship));
 731
 732                                         score = 0;
 733
 734                                         state = GAMEPLAY;
 735                                         play_tune(TUNE_GAMEPLAY);
 736                                 }
 737                         }
 738
 739                         ship.jets = 0;
 740                 }
 741
 742                 if(state == GAMEPLAY) {
 743                         if(!paused) {
 744                                 if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { ship.dx -= 1.5*t_frame; ship.jets |= 1<<0;}
 745                                 if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { ship.dy += 1.5*t_frame; ship.jets |= 1<<1;}
 746                                 if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { ship.dx += 1.5*t_frame; ship.jets |= 1<<2;}
 747                                 if(keystate[SDLK_UP]    | keystate[SDLK_c]) { ship.dy -= 1.5*t_frame; ship.jets |= 1<<3;}
 748                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 749                         }
 750
 751                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 752                                 if(!pausedown) {
 753                                         paused = !paused;
 754                                         pausedown = 1;
 755                                         if(!paused) ms_end = SDL_GetTicks();
 756                                 }
 757                         } else {
 758                                 pausedown = 0;
 759                         }
 760                 }
 761
 762                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 763                         state = HIGH_SCORE_DISPLAY;
 764                         state_timeout = 400;
 765                 }
 766         }
 767 }
 768
 769 int
 770 main(int argc, char **argv) {
 771         if(!parse_opts(argc, argv)) return 1;
 772
 773         if(init()) {
 774                 printf ("ta: '%s'\n",initerror);
 775                 return 1;
 776         }
 777
 778         gameloop();
 779
 780         return 0;
 781 }