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)  adjusted for gamespeed
  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, n, x, y;
 142         uint16_t *pixel, c;
 143         uint32_t colorkey;
 144         int row_inc;
 145         double theta, r;
 146
 147         n = 24.0 * t_frame;
 148         pixel = s->pixels;
 149         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 150         colorkey = s->format->colorkey;
 151
 152         SDL_LockSurface(s);
 153
 154         for(i=0; i<n; i++) {
 155                 pixel = s->pixels;
 156                 for(y=0; y<s->h; y++) {
 157                         for(x = 0; x<s->w; x++) {
 158                                 c = *pixel++;
 159                                 if(c && c != colorkey) {
 160                                         theta = frnd()*M_PI*2;
 161                                         r = frnd(); r = 1 - r*r;
 162
 163                                         bdot[bd2].dx = 45*r*cos(theta) + dx;
 164                                         bdot[bd2].dy = 45*r*sin(theta) + dy;
 165                                         bdot[bd2].x = x + xbang;
 166                                         bdot[bd2].y = y + ybang;
 167                                         bdot[bd2].c = (i < n-3) ? 0 : c;
 168                                         bdot[bd2].life = 100;
 169                                         bdot[bd2].decay = frnd()*3 + 1;
 170                                         bdot[bd2].active = 1;
 171
 172                                         bd2 = (bd2+1) % MAXBANGDOTS;
 173                                 }
 174                                 pixel += row_inc;
 175                         }
 176                 }
 177         }
 178
 179         SDL_UnlockSurface(s);
 180 }
 181
 182 void
 183 move_bang_dots(float ticks)
 184 {
 185         int i;
 186         Sprite *hit;
 187
 188         for(i=0; i<MAXBANGDOTS; i++) {
 189                 if(!bdot[i].active) continue;
 190
 191                 // decrement life and maybe kill
 192                 bdot[i].life -= bdot[i].decay;
 193                 if(bdot[i].life < 0) { bdot[i].active = 0; continue; }
 194
 195                 // move and clip
 196                 bdot[i].x += (bdot[i].dx - screendx)*ticks;
 197                 bdot[i].y += (bdot[i].dy - screendy)*ticks;
 198                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 199                         bdot[i].active = 0;
 200                         continue;
 201                 }
 202
 203                 // check collisions
 204                 if((hit = pixel_collides(bdot[i].x, bdot[i].y))) {
 205                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 206                                 bdot[i].active = 0;
 207                                 hit->dx += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dx / sprite_mass(hit);
 208                                 hit->dy += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dy / sprite_mass(hit);
 209                                 continue;
 210                         }
 211                 }
 212         }
 213 }
 214
 215
 216 void
 217 draw_bang_dots(SDL_Surface *s)
 218 {
 219         int i;
 220         uint16_t *pixels, *pixel, c;
 221         int row_inc = s->pitch/sizeof(uint16_t);
 222
 223         pixels = (uint16_t *) s->pixels;
 224
 225         for(i=0; i<MAXBANGDOTS; i++) {
 226                 if(!bdot[i].active) continue;
 227
 228                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 229                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 230                 *pixel = c;
 231         }
 232 }
 233
 234
 235 void
 236 new_engine_dots(float time_span) {
 237         int dir, i;
 238         int n = time_span * ENGINE_DOTS_PER_TIC;
 239         float a, r;  // angle, random length
 240         float dx, dy;
 241         float hx, hy; // half ship width/height.
 242         static const int s[4] = { 2, 1, 0, 1 };
 243         float time;
 244         float accelh, accelv, past_ship_dx, past_ship_dy;
 245
 246         hx = ship.image->w / 2;
 247         hy = ship.image->h / 2;
 248
 249         for(dir=0; dir<4; dir++) {
 250                 if(!(ship.jets & 1<<dir)) continue;
 251
 252                 for(i = 0; i<n; i++) {
 253                         if(dotptr->active == 0) {
 254                                 a = frnd()*M_PI + (dir-1)*M_PI_2;
 255                                 r = sin(frnd()*M_PI);
 256                                 dx = r * cos(a);
 257                                 dy = r * -sin(a);  // screen y is "backwards".
 258
 259                                 dotptr->active = 1;
 260
 261                                 // dot was created at a random time during the time span
 262                                 time = frnd() * time_span; // this is how long ago
 263
 264                                 // calculate how fast the ship was going when this engine dot was
 265                                 // created (as if it had a smooth acceleration). This is used in
 266                                 // determining the velocity of the dots, but not their starting
 267                                 // location.
 268                                 accelh = ((ship.jets >> 2) & 1) - (ship.jets & 1);
 269                                 accelh *= THRUSTER_STRENGTH * time;
 270                                 past_ship_dx = ship.dx - accelh;
 271                                 accelv = ((ship.jets >> 1) & 1) - ((ship.jets >> 3) & 1);
 272                                 accelv *= THRUSTER_STRENGTH * time;
 273                                 past_ship_dy = ship.dy - accelv;
 274
 275                                 // the starting position (not speed) of the dot is calculated as
 276                                 // though the ship were traveling at a constant speed for this
 277                                 // time_span.
 278                                 dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 279                                 dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 280                                 if(dir&1) {
 281                                         dotptr->dx = past_ship_dx + 2*dx;
 282                                         dotptr->dy = past_ship_dy + 20*dy;
 283                                         dotptr->life = 60 * fabs(dy);
 284                                 } else {
 285                                         dotptr->dx = past_ship_dx + 20*dx;
 286                                         dotptr->dy = past_ship_dy + 2*dy;
 287                                         dotptr->life = 60 * fabs(dx);
 288                                 }
 289
 290                                 // move the dot as though it were created in the past
 291                                 dotptr->x += (dotptr->dx - screendx) * time;
 292                                 dotptr->y += (dotptr->dy - screendy) * time;
 293
 294                                 if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 295                                 else dotptr = edot;
 296                         }
 297                 }
 298         }
 299 }
 300
 301 void
 302 move_engine_dots(float ticks) {
 303         int i;
 304         Sprite *hit;
 305
 306         for(i = 0; i<MAXENGINEDOTS; i++) {
 307                 if(!edot[i].active) continue;
 308
 309                 edot[i].x += (edot[i].dx - screendx)*ticks;
 310                 edot[i].y += (edot[i].dy - screendy)*ticks;
 311                 edot[i].life -= t_frame*3;
 312                 if(edot[i].life < 0 || edot[i].x<0 || edot[i].x >= XSIZE || edot[i].y < 0 || edot[i].y >= YSIZE) {
 313                         edot[i].active = 0;
 314                 }
 315
 316                 // check collisions
 317                 if((hit = pixel_collides(edot[i].x, edot[i].y))) {
 318                         if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
 319                                 edot[i].active = 0;
 320                                 hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
 321                                 hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
 322                                 continue;
 323                         }
 324                 }
 325         }
 326 }
 327
 328 void
 329 draw_engine_dots(SDL_Surface *s) {
 330         int i;
 331         uint16_t c;
 332         uint16_t *pixels = (uint16_t *) s->pixels;
 333         int row_inc = s->pitch/sizeof(uint16_t);
 334         int heatindex;
 335
 336         for(i = 0; i<MAXENGINEDOTS; i++) {
 337                 if(!edot[i].active) continue;
 338
 339                 heatindex = edot[i].life * 6;
 340                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 341                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 342         }
 343 }
 344
 345 void
 346 draw_dots(SDL_Surface *s) {
 347         SDL_LockSurface(s);
 348         draw_dust(s);
 349         draw_engine_dots(s);
 350         draw_bang_dots(s);
 351         SDL_UnlockSurface(s);
 352 }
 353
 354 SDL_Surface *
 355 load_image(char *filename)
 356 {
 357         SDL_Surface *tmp, *img = NULL;
 358         char *s = add_data_path(filename);
 359         if(s) {
 360                 tmp = IMG_Load(s);
 361                 free(s);
 362                 if(tmp) {
 363                         img = SDL_DisplayFormat(tmp);
 364                         SDL_FreeSurface(tmp);
 365                 }
 366         }
 367         return img;
 368 }
 369
 370 void
 371 load_ship(void)
 372 {
 373         load_sprite(SPRITE(&ship), "ship.png");
 374 }
 375
 376 int
 377 init(void) {
 378
 379         int i;
 380         char *s;
 381         Uint32 flag;
 382
 383         // Where are our data files?
 384         if(!find_files()) exit(1);
 385         read_high_score_table();
 386
 387         if(opt_sound) {
 388                 // Initialize SDL with audio and video
 389                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 390                         opt_sound = 0;
 391                         fputs("Can't open sound, starting without it\n", stderr);
 392                         atexit(SDL_Quit);
 393                 } else {
 394                         atexit(SDL_Quit);
 395                         atexit(SDL_CloseAudio);
 396                         opt_sound = init_sound();
 397                 }
 398         } else {
 399                 // Initialize with video only
 400                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 401                 atexit(SDL_Quit);
 402         }
 403
 404         play_tune(TUNE_TITLE_PAGE);
 405
 406         // Attempt to get the required video size
 407         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 408         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 409         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 410
 411         // Set the title bar text
 412         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 413
 414         NULLERROR(surf_screen);
 415
 416         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 417         for(i = 0; i<W*3; i++) {
 418                 heatcolor[i] = SDL_MapRGB(
 419                         surf_screen->format,
 420                         (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?
 421                 );
 422         }
 423
 424         // Load the banners
 425         NULLERROR(surf_b_variations = load_image("b_variations.png"));
 426         NULLERROR(surf_b_on = load_image("b_on.png"));
 427         NULLERROR(surf_b_rockdodger = load_image("b_rockdodger.png"));
 428
 429         NULLERROR(surf_b_game = load_image("b_game.png"));
 430         NULLERROR(surf_b_over = load_image("b_over.png"));
 431
 432         // Load the life indicator (small ship) graphic.
 433         NULLERROR(surf_life = load_image("life.png"));
 434
 435         // Load the font image
 436         s = add_data_path("font.png");
 437         if(s) {
 438                 NULLERROR(surf_font_big = IMG_Load(s));
 439                 free(s);
 440                 g_font = SFont_InitFont(surf_font_big);
 441         }
 442
 443         init_engine_dots();
 444         init_dust();
 445
 446         init_sprites();
 447         add_sprite(SPRITE(&ship));
 448
 449         // Remove the mouse cursor
 450 #ifdef SDL_DISABLE
 451         SDL_ShowCursor(SDL_DISABLE);
 452 #endif
 453
 454         return 0;
 455 }
 456
 457 void
 458 show_lives(void)
 459 {
 460         int i;
 461         SDL_Rect dest;
 462
 463         for(i=0; i<ship.lives-1; i++) {
 464                 dest.x = (i + 1)*(surf_life->w + 10);
 465                 dest.y = 20;
 466                 SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 467         }
 468 }
 469
 470 void
 471 draw_game_over(void)
 472 {
 473         int x;
 474         char *text0, *text1;
 475         SDL_Rect dest;
 476         float a_game = 0, a_over = 0;
 477
 478         // fade in "GAME", then "OVER".
 479         a_game = min(1.0, faderate*fadetimer/3.0);
 480         if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 481
 482         fadetimer += t_frame;
 483
 484         dest.x = (XSIZE-surf_b_game->w)/2;
 485         dest.y = (YSIZE-surf_b_game->h)/2-40;
 486         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 487         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 488
 489         dest.x = (XSIZE-surf_b_over->w)/2;
 490         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 491         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 492         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 493
 494         if(new_high_score(score)) {
 495                 text0 = "New High Score!";
 496                 text1 = "Press SPACE to continue";
 497         } else {
 498                 text0 = msgs[g_easy][0];
 499                 text1 = msgs[g_easy][1];
 500         }
 501
 502         x = (XSIZE-SFont_TextWidth(g_font,text0))/2 + cos(fadetimer/9)*10;
 503         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 504
 505         x = (XSIZE-SFont_TextWidth(g_font,text1))/2 + sin(fadetimer/9)*10;
 506         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 507 }
 508
 509 void
 510 draw_title_page(void)
 511 {
 512         int x;
 513         char *text;
 514         SDL_Rect dest;
 515
 516         fadetimer += t_frame/2.0;
 517
 518         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 519         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 520         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 521         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 522
 523         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 524         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 525         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 526         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 527
 528         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 529         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 530         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 531         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 532
 533         text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
 534         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 535         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 536
 537         text = "Version " VERSION;
 538         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 539         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 540 }
 541
 542 void
 543 draw(void) {
 544
 545         SDL_FillRect(surf_screen,NULL,0);  // black background
 546         draw_dots(surf_screen);             // background dots
 547         draw_sprite(SPRITE(&ship));
 548         draw_rocks();
 549
 550         show_lives();
 551         show_score();
 552
 553         // If it's game over, show the game over graphic in the dead centre
 554         switch (state) {
 555                 case GAME_OVER: draw_game_over(); break;
 556
 557                 case TITLE_PAGE: draw_title_page(); break;
 558
 559                 case HIGH_SCORE_ENTRY:
 560                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 561                 // FALL THROUGH TO
 562                 case HIGH_SCORE_DISPLAY:
 563                         // Display de list o high scores mon.
 564                         display_scores(surf_screen, 150,50);
 565                         break;
 566                 case GAMEPLAY:
 567                 case DEAD_PAUSE:
 568                         ; // no action necessary
 569         }
 570
 571         collisions();
 572
 573         // Update the surface
 574         SDL_Flip(surf_screen);
 575 }
 576
 577 static inline void
 578 kill_ship(Sprite *ship)
 579 {
 580         ship->flags = MOVE;
 581         bang = true;
 582 }
 583
 584 void
 585 do_collision(Sprite *a, Sprite *b)
 586 {
 587         if(a->type == SHIP) kill_ship(a);
 588         else if (b->type == SHIP) kill_ship(b);
 589         else bounce(a, b);
 590 }
 591
 592 void
 593 init_score_entry(void)
 594 {
 595         SDL_Event e;
 596         state = HIGH_SCORE_ENTRY;
 597         state_timeout = 5.0e6;
 598         SDL_EnableUNICODE(1);
 599         while(SDL_PollEvent(&e))
 600                 ;
 601         insert_score(score);
 602 }
 603
 604 // Count down the state timer, and change state when it gets to zero or less;
 605 void
 606 update_state(float ticks)
 607 {
 608         state_timeout -= ticks*3;
 609         if(state_timeout > 0) return;
 610
 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 }
 640
 641 void
 642 gameloop() {
 643         SDL_Event e;
 644         Uint8 *keystate;
 645         float tmp;
 646
 647         for(;;) {
 648                 ms_frame = SDL_GetTicks() - ms_end;
 649                 ms_end += ms_frame;
 650                 t_frame = opt_gamespeed * ms_frame / 50;
 651
 652                 while(SDL_PollEvent(&e)) {
 653                         switch(e.type) {
 654                                 case SDL_QUIT: return;
 655                                 case SDL_KEYUP:
 656                                         if(e.key.keysym.sym == SDLK_ESCAPE
 657                                            || e.key.keysym.sym == SDLK_q)
 658                                                 return;
 659                                         break;
 660                                 case SDL_KEYDOWN:
 661                                         if(state == HIGH_SCORE_ENTRY)
 662                                                 if(!process_score_input(&e.key.keysym)) {
 663                                                         // Write the high score table to the file
 664                                                         write_high_score_table();
 665                                                         // continue to display the scores briefly
 666                                                         state = HIGH_SCORE_DISPLAY;
 667                                                         state_timeout = 200;
 668                                                         play_tune(TUNE_TITLE_PAGE);
 669                                                 }
 670                                         break;
 671                         }
 672                 }
 673                 keystate = SDL_GetKeyState(NULL);
 674
 675                 if(state == GAMEPLAY) {
 676                         if(!paused) {
 677                                 score += ms_frame;
 678
 679                                 if(keystate[SDLK_LEFT]  || keystate[SDLK_h]) { ship.dx -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<0;}
 680                                 if(keystate[SDLK_DOWN]  || keystate[SDLK_t]) { ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;}
 681                                 if(keystate[SDLK_RIGHT] || keystate[SDLK_n]) { ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;}
 682                                 if(keystate[SDLK_UP]    || keystate[SDLK_c]) { ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;}
 683                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 684                         }
 685
 686                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 687                                 if(!pausedown) {
 688                                         paused = !paused;
 689                                         pausedown = 1;
 690                                         if(!paused) ms_end = SDL_GetTicks();
 691                                 }
 692                         } else {
 693                                 pausedown = 0;
 694                         }
 695                 }
 696
 697                 if(!paused) {
 698                         update_state(t_frame);
 699
 700                         if(state == DEAD_PAUSE && bangx < 60) bangx = 60;
 701
 702                         // SCROLLING
 703                         tmp = (ship.y+ship.h/2+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
 704                         screendy += tmp * t_frame/12;
 705                         tmp = (ship.x+ship.w/2+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
 706                         screendx += tmp * t_frame/12;
 707                         // taper off so we don't hit the barrier abruptly.
 708                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 709                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
 710                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 711                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 712                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 713
 714                         // move bang center
 715                         bangx += (bangdx - screendx)*t_frame;
 716                         bangy += (bangdy - screendy)*t_frame;
 717
 718                         move_sprites(t_frame);
 719                         move_engine_dots(t_frame);
 720                         move_bang_dots(t_frame);
 721                         move_dust(t_frame);
 722
 723                         // BOUNCE off left or right edge of screen
 724                         if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 725                                 ship.x -= (ship.dx-screendx)*t_frame;
 726                                 ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
 727                         }
 728
 729                         // BOUNCE off top or bottom of screen
 730                         if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 731                                 ship.y -= (ship.dy-screendy)*t_frame;
 732                                 ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
 733                         }
 734
 735                         new_rocks(t_frame);
 736                         new_engine_dots(t_frame);
 737
 738                         draw();
 739
 740                         if(state == GAMEPLAY && bang) {
 741                                 // Died
 742                                 bang = false;
 743                                 play_sound(SOUND_BANG); // Play the explosion sound
 744                                 bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
 745                                 new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
 746
 747                                 if(--ship.lives) {
 748                                         state = DEAD_PAUSE;
 749                                         state_timeout = DEAD_PAUSE_LENGTH;
 750                                         ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
 751                                         ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
 752                                         if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
 753                                 } else {
 754                                         state = GAME_OVER;
 755                                         ship.dx = SCREENDXMIN; ship.dy = 0;
 756                                         state_timeout = 200.0;
 757                                         fadetimer = 0.0;
 758                                         faderate = t_frame;
 759                                 }
 760                         }
 761
 762                         // new game
 763                         if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
 764                            && (state == HIGH_SCORE_DISPLAY
 765                                || state == TITLE_PAGE
 766                                || state == GAME_OVER)) {
 767                                 if(state == GAME_OVER && new_high_score(score))
 768                                         init_score_entry();
 769                                 else {
 770                                         if((keystate[SDLK_SPACE] && !initial_rocks) || keystate[SDLK_2]) {
 771                                                 g_easy = 0;
 772                                                 initial_rocks = NORMAL_I_ROCKS;
 773                                                 final_rocks = NORMAL_F_ROCKS;
 774                                                 if(opt_gamespeed == EASY_GAMESPEED)
 775                                                         opt_gamespeed = NORMAL_GAMESPEED;
 776                                         } else if(keystate[SDLK_1]) {
 777                                                 g_easy = 1;
 778                                                 initial_rocks = EASY_I_ROCKS;
 779                                                 final_rocks = EASY_F_ROCKS;
 780                                                 opt_gamespeed = EASY_GAMESPEED;
 781                                         }
 782                                         reset_sprites();
 783                                         reset_rocks();
 784                                         screendx = SCREENDXMIN; screendy = 0;
 785
 786                                         ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 787                                         ship.dx = screendx; ship.dy = screendy;
 788                                         ship.lives = 4;
 789                                         ship.flags = MOVE|DRAW|COLLIDE;
 790                                         add_sprite(SPRITE(&ship));
 791
 792                                         score = 0;
 793
 794                                         state = GAMEPLAY;
 795                                         play_tune(TUNE_GAMEPLAY);
 796                                 }
 797                         }
 798
 799                         ship.jets = 0;
 800                 }
 801
 802                 if(state == TITLE_PAGE && keystate[SDLK_h]) {
 803                         state = HIGH_SCORE_DISPLAY;
 804                         state_timeout = 400;
 805                 }
 806         }
 807 }
 808
 809 int
 810 main(int argc, char **argv) {
 811         if(!parse_opts(argc, argv)) return 1;
 812
 813         if(init()) {
 814                 printf ("ta: '%s'\n",initerror);
 815                 return 1;
 816         }
 817
 818         gameloop();
 819
 820         return 0;
 821 }