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 #ifdef DEBUG
  23 #include "debug.h"
  24 #endif
  25
  26 #include "config.h"
  27 #include "file.h"
  28 #include "score.h"
  29 #include "shape.h"
  30 #include "sound.h"
  31
  32 #include <math.h>
  33 #include <SDL/SDL.h>
  34 #include <SDL/SDL_image.h>
  35 #include <stdarg.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include "SFont.h"
  42
  43 #define CONDERROR(a) if((a)) {initerror = strdup(SDL_GetError());return 1;}
  44 #define NULLERROR(a) CONDERROR((a) == NULL)
  45
  46 // ************************************* STRUCTS
  47 struct rock_struct {
  48         // Array of black pixel coordinates. This is scanned
  49         // every frame to see if it's still black, and as
  50         // soon as it isn't we BLOW UP
  51         float x,y,dx,dy;
  52         int active;
  53         int dead;  // has been blown out of the way
  54                    // to make room for a new ship appearing.
  55         SDL_Surface *image;
  56         struct shape *shape;
  57         int type_number;
  58 };
  59 struct black_point_struct {
  60         int x,y;
  61 };
  62 struct bangdots {
  63         // Bang dots have the same colour as shield dots.
  64         // Bang dots get darker as they age.
  65         // Some are coloured the same as the ex-ship.
  66         float x,y,dx,dy;
  67         Uint16 c; // when zero, use heatcolor[bangdotlife]
  68         float life;     // When reduced to 0, set active = 0
  69         int active;
  70         float decay;// Amount by which to reduce life each time dot is drawn
  71 };
  72 struct enginedots {
  73         // Engine dots stream out the back of the ship, getting darker as they go.
  74         int active;
  75         float x,y,dx,dy;
  76         // The life of an engine dot
  77         // is a number starting at between 0 and 50 and counting backward.
  78         float life;     // When reduced to 0, set active = 0
  79 };
  80 struct spacedot {
  81         // Space dots are harmless background items
  82         // All are active. When one falls off the edge, another is created at the start.
  83         float x,y,dx;
  84         Uint16 color;
  85 };
  86
  87 // ************************************* VARS
  88 // SDL_Surface global variables
  89 SDL_Surface
  90         *surf_screen,   // Screen
  91         *surf_b_variations, // "variations" banner
  92         *surf_b_on, // "on" banner
  93         *surf_b_rockdodger, // "rockdodger" banner
  94         *surf_b_game,   // Title element "game"
  95         *surf_b_over,   // Title element "over"
  96         *surf_ship,             // Spaceship element
  97         *surf_life,     // Indicator of number of ships remaining
  98         *surf_rock[NROCKS],     // THE ROCKS
  99         *surf_font_big; // The big font
 100
 101 struct shape rock_shapes[NROCKS];
 102
 103 SFont_Font *g_font;
 104
 105 // Structure global variables
 106 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
 107 struct rock_struct rock[MAXROCKS], *rockptr = rock;
 108 struct black_point_struct black_point[MAXBLACKPOINTS], *blackptr = black_point;
 109 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
 110 struct spacedot sdot[MAXSPACEDOTS];
 111
 112 // Other global variables
 113 char topline[1024];
 114 char *initerror = "";
 115
 116 struct shape shipshape;
 117 float shipx,shipy = 240.0;      // X position, 0..XSIZE
 118 float shipdx,shipdy;    // Change in X position per tick.
 119 float rockrate,rockspeed;
 120 float movementrate;  // this controls the speed of everything that moves.
 121 float yscroll;
 122 float scrollvel;
 123
 124 int nships,score,initticks,ticks_since_last, last_ticks;
 125 int gameover;
 126 int countdown = 0;
 127 int maneuver = 0;
 128 int sound_flag = 1, music_flag = 0;
 129 int tail_plume = 0; // display big engine at the back?
 130 int friction = 0;       // should there be friction?
 131 float fadetimer = 0, faderate;
 132
 133 int pausedown = 0, paused = 0;
 134
 135 // bangdot start (bd1) and end (bd2) position:
 136 int bd1 = 0, bd2 = 0;
 137
 138 enum states {
 139         TITLE_PAGE,
 140         GAMEPLAY,
 141         DEAD_PAUSE,
 142         GAME_OVER,
 143         HIGH_SCORE_ENTRY,
 144         HIGH_SCORE_DISPLAY
 145 };
 146 enum states state = TITLE_PAGE;
 147 float state_timeout = 600.0;
 148
 149 #define NSEQUENCE 2
 150 char *sequence[] = {
 151         "Press SPACE to start",
 152         "http://qualdan.com/vor/"
 153 };
 154
 155 int bangdotlife, nbangdots;
 156 Uint16 heatcolor[W*3];
 157
 158 char *data_dir;
 159 extern char *optarg;
 160 extern int optind, opterr, optopt;
 161
 162 float dist_sq(float x1, float y1, float x2, float y2)
 163 {
 164         return (x2-x1)*(x2-x1) + (y2-y1)*(y2-y1);
 165 }
 166
 167 // ************************************* FUNCS
 168
 169 float
 170 rnd() {
 171         return (float)random()/(float)RAND_MAX;
 172 }
 173
 174 void
 175 init_engine_dots() {
 176         int i;
 177         for(i = 0; i<MAXENGINEDOTS; i++) {
 178                 edot[i].active = 0;
 179         }
 180 }
 181
 182 void
 183 init_space_dots() {
 184         int i,intensity;
 185         for(i = 0; i<MAXSPACEDOTS; i++) {
 186                 float r;
 187
 188                 sdot[i].x = rnd()*(XSIZE-5);
 189                 sdot[i].y = rnd()*(YSIZE-5);
 190
 191                 r = rnd()*rnd();
 192
 193                 sdot[i].dx = -r*4;
 194                 // -1/((1-r) + .3);
 195                 intensity = (int)(r*180 + 70);
 196                 sdot[i].color = SDL_MapRGB(surf_screen->format,intensity,intensity,intensity);
 197
 198         }
 199 }
 200
 201 void
 202 makebangdots(int xbang, int ybang, int dx, int dy, SDL_Surface *s, int power) {
 203
 204         // TODO - stop generating dots after a certain amount of time has passed, to cope with slower CPUs.
 205         // TODO - generate and display dots in a circular buffer
 206
 207         int x,y,endcount;
 208         Uint16 *rawpixel,c;
 209         double theta,r;
 210         int begin_generate;
 211
 212         begin_generate = SDL_GetTicks();
 213
 214         SDL_LockSurface(s);
 215         rawpixel = (Uint16 *) s->pixels;
 216
 217         //for(n = 0; n <= power/2; n++) {
 218
 219         endcount = 0;
 220         while (endcount<3) {
 221                 for(x = 0; x<s->w; x++) {
 222                         for(y = 0; y<s->h; y++) {
 223                                 c = rawpixel[s->pitch/2*y + x];
 224                                 if(c && c != s->format->colorkey) {
 225
 226                                         theta = rnd()*M_PI*2;
 227
 228                                         r = 1-(rnd()*rnd());
 229
 230                                         bdot[bd2].dx = (power/50.0)*45.0*cos(theta)*r + dx;
 231                                         bdot[bd2].dy = (power/50.0)*45.0*sin(theta)*r + dy;
 232                                         bdot[bd2].x = x + xbang;
 233                                         bdot[bd2].y = y + ybang;
 234
 235                                         // Replace the last few bang dots with the pixels from the exploding object
 236                                         bdot[bd2].c = (endcount>0)?c:0;
 237                                         bdot[bd2].life = 100;
 238                                         bdot[bd2].decay = rnd()*3 + 1;
 239                                         bdot[bd2].active = 1;
 240
 241                                         bd2++;
 242                                         bd2 %= MAXBANGDOTS;
 243
 244                                         // If the circular buffer is filled, who cares? They've had their chance.
 245                                         //if(bd2 == bd1-1) goto exitloop;
 246
 247                                 }
 248                         }
 249                 }
 250
 251                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 252         }
 253
 254         SDL_UnlockSurface(s);
 255
 256 }
 257
 258 void
 259 draw_bang_dots(SDL_Surface *s) {
 260         int i;
 261         int first_i, last_i;
 262         Uint16 *rawpixel;
 263         rawpixel = (Uint16 *) s->pixels;
 264
 265         first_i = -1;
 266
 267         for(i = bd1; (bd1 <= bd2)?(i<bd2):(i >= bd1 && i < bd2); last_i = ++i) {
 268
 269                 i %= MAXBANGDOTS;
 270
 271                 if(bdot[i].x <= 0 || bdot[i].x >= XSIZE || bdot[i].y <= 0 || bdot[i].y >= YSIZE) {
 272                         // If the dot has drifted outside the perimeter, kill it
 273                         bdot[i].active = 0;
 274                 }
 275
 276                 if(bdot[i].active) {
 277                         if(first_i < 0)
 278                         first_i = i;
 279                         //last_i = i + 1;
 280                         rawpixel[(int)(s->pitch/2*(int)(bdot[i].y)) + (int)(bdot[i].x)] = bdot[i].c ? bdot[i].c : heatcolor[(int)(bdot[i].life*3)];
 281                         bdot[i].life -= bdot[i].decay;
 282                         bdot[i].x += bdot[i].dx*movementrate;
 283                         bdot[i].y += bdot[i].dy*movementrate + yscroll;
 284
 285                         if(bdot[i].life<0)
 286                         bdot[i].active = 0;
 287                 }
 288         }
 289
 290         if(first_i >= 0) {
 291                 bd1 = first_i;
 292                 bd2 = last_i;
 293         }
 294         else {
 295                 bd1 = 0;
 296                 bd2 = 0;
 297         }
 298
 299 }
 300
 301
 302 void
 303 draw_space_dots(SDL_Surface *s) {
 304         int i;
 305         Uint16 *rawpixel;
 306         rawpixel = (Uint16 *) s->pixels;
 307
 308         for(i = 0; i<MAXSPACEDOTS; i++) {
 309                 if(sdot[i].y<0) {
 310                         sdot[i].y = 0;
 311                 }
 312                 rawpixel[(int)(s->pitch/2*(int)sdot[i].y) + (int)(sdot[i].x)] = sdot[i].color;
 313                 sdot[i].x += sdot[i].dx*movementrate;
 314                 sdot[i].y += yscroll;
 315                 if(sdot[i].y > YSIZE) {
 316                         sdot[i].y -= YSIZE;
 317                 } else if(sdot[i].y < 0) {
 318                         sdot[i].y += YSIZE;
 319                 }
 320                 if(sdot[i].x<0) {
 321                         sdot[i].x = XSIZE;
 322                 }
 323         }
 324 }
 325
 326 void
 327 draw_engine_dots(SDL_Surface *s) {
 328         int i;
 329         Uint16 *rawpixel;
 330         rawpixel = (Uint16 *) s->pixels;
 331
 332         for(i = 0; i<MAXENGINEDOTS; i++) {
 333                 if(edot[i].active) {
 334                         edot[i].x += edot[i].dx*movementrate;
 335                         edot[i].y += edot[i].dy*movementrate + yscroll;
 336                         if((edot[i].life -= movementrate*3)<0 || edot[i].y<0 || edot[i].y>YSIZE) {
 337                                 edot[i].active = 0;
 338                         } else if(edot[i].x<0 || edot[i].x>XSIZE) {
 339                                 edot[i].active = 0;
 340                         } else {
 341                                 int heatindex;
 342                                 heatindex = edot[i].life * 6;
 343                                 //rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = lifecolor[(int)(edot[i].life)];
 344                                 rawpixel[(int)(s->pitch/2*(int)(edot[i].y)) + (int)(edot[i].x)] = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 345                         }
 346                 }
 347         }
 348 }
 349
 350 void
 351 create_engine_dots(int newdots) {
 352         int i;
 353         double theta,r,dx,dy;
 354
 355         if(!tail_plume) return;
 356
 357         if(state == GAMEPLAY) {
 358                 for(i = 0; i<newdots*movementrate; i++) {
 359                         if(dotptr->active == 0) {
 360                                 theta = rnd()*M_PI*2;
 361                                 r = rnd();
 362                                 dx = cos(theta)*r;
 363                                 dy = sin(theta)*r;
 364
 365                                 dotptr->active = 1;
 366                                 dotptr->x = shipx + surf_ship->w/2-14;
 367                                 dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*5-1;
 368                                 dotptr->dx = 10*(dx-1.5) + shipdx;
 369                                 dotptr->dy = 1*dy + shipdy;
 370                                 dotptr->life = 45 + rnd(1)*5;
 371
 372                                 dotptr++;
 373                                 if(dotptr-edot >= MAXENGINEDOTS) {
 374                                         dotptr = edot;
 375                                 }
 376                         }
 377                 }
 378         }
 379 }
 380
 381 void
 382 create_engine_dots2(int newdots, int m) {
 383         int i;
 384         double theta, theta2, dx, dy, adx, ady;
 385
 386         // Don't create fresh engine dots when
 387         // the game is not being played and a demo is not beng shown
 388         if(state != GAMEPLAY) return;
 389
 390         for(i = 0; i<newdots; i++) {
 391                 if(dotptr->active == 0) {
 392                         theta = rnd()*M_PI*2;
 393                         theta2 = rnd()*M_PI*2;
 394
 395                         dx = cos(theta) * fabs(cos(theta2));
 396                         dy = sin(theta) * fabs(cos(theta2));
 397                         adx = fabs(dx);
 398                         ady = fabs(dy);
 399
 400
 401                         dotptr->active = 1;
 402                         dotptr->x = shipx + surf_ship->w/2 + (rnd()-0.5)*3;
 403                         dotptr->y = shipy + surf_ship->h/2 + (rnd()-0.5)*3;
 404
 405                         switch(m) {
 406                                 case 0:
 407                                         dotptr->x -= 14;
 408                                         dotptr->dx = -20*adx + shipdx;
 409                                         dotptr->dy = 2*dy + shipdy;
 410                                         dotptr->life = 60 * adx;
 411                                 break;
 412                                 case 1:
 413                                         dotptr->dx = 2*dx + shipdx;
 414                                         dotptr->dy = -20*ady + shipdy;
 415                                         dotptr->life = 60 * ady;
 416                                 break;
 417                                 case 2:
 418                                         dotptr->x += 14;
 419                                         dotptr->dx = 20*adx + shipdx;
 420                                         dotptr->dy = 2*dy + shipdy;
 421                                         dotptr->life = 60 * adx;
 422                                 break;
 423                                 case 3:
 424                                         dotptr->dx = 2*dx + shipdx;
 425                                         dotptr->dy = 20*ady + shipdy;
 426                                         dotptr->life = 60 * ady;
 427                                 break;
 428                         }
 429                         dotptr++;
 430                         if(dotptr-edot >= MAXENGINEDOTS) {
 431                                 dotptr = edot;
 432                         }
 433                 }
 434         }
 435 }
 436
 437 void
 438 drawdots(SDL_Surface *s) {
 439         int m;
 440
 441         SDL_LockSurface(s);
 442         // Draw the background stars aka space dots
 443         draw_space_dots(s);
 444
 445         // Draw the score when playing the game or whn the game is freshly over
 446         if(1 || state == GAMEPLAY || state == DEAD_PAUSE || state == GAME_OVER ) {
 447                 SDL_UnlockSurface(s);
 448
 449                 snprintscore_line(topline, 50, score);
 450                 SFont_Write(s,g_font,XSIZE-250,0,topline);
 451
 452                 SDL_LockSurface(s);
 453         }
 454
 455         // Draw all the engine dots
 456         draw_engine_dots(s);
 457
 458         // Create more engine dots comin out da back
 459         if(!gameover) create_engine_dots(200);
 460
 461         // Create engine dots out the side we're moving from
 462         for(m = 0; m<4; m++) {
 463                 if(maneuver & 1<<m) { // 'maneuver' is a bit field
 464                         create_engine_dots2(80,m);
 465                 }
 466         }
 467
 468         // Draw all outstanding bang dots
 469         //if(bangdotlife-- > 0)
 470         draw_bang_dots(s);
 471
 472         SDL_UnlockSurface(s);
 473 }
 474
 475                 char a[MAX_PATH_LEN];
 476 int
 477 init(int fullscreen) {
 478
 479         int i,j;
 480         SDL_Surface *temp;
 481         Uint16 *raw_pixels;
 482         Uint32 flag;
 483
 484         // Where are our data files?
 485         if(!find_files()) exit(1);
 486         read_high_score_table();
 487
 488         if(sound_flag) {
 489                 // Initialize SDL with audio and video
 490                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 491                         sound_flag = 0;
 492                         printf ("Can't open sound, starting without it\n");
 493                         atexit(SDL_Quit);
 494                 } else {
 495                         atexit(SDL_Quit);
 496                         atexit(SDL_CloseAudio);
 497                         sound_flag = init_sound();
 498                 }
 499         } else {
 500                 // Initialize with video only
 501                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 502                 atexit(SDL_Quit);
 503         }
 504
 505         play_tune(0);
 506
 507         // Attempt to get the required video size
 508         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 509         if(fullscreen) flag |= SDL_FULLSCREEN;
 510         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 511
 512         // Set the title bar text
 513         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 514
 515         NULLERROR(surf_screen);
 516
 517         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 518         for(i = 0; i<W*3; i++) {
 519                 heatcolor[i] = SDL_MapRGB(
 520                         surf_screen->format,
 521                         (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?
 522                 );
 523         }
 524
 525         // Load the banners
 526         NULLERROR(temp = IMG_Load(add_path("banners/variations.png")));
 527         NULLERROR(surf_b_variations = SDL_DisplayFormat(temp));
 528
 529         NULLERROR(temp = IMG_Load(add_path("banners/on.png")));
 530         NULLERROR(surf_b_on = SDL_DisplayFormat(temp));
 531
 532         NULLERROR(temp = IMG_Load(add_path("banners/rockdodger.png")));
 533         NULLERROR(surf_b_rockdodger = SDL_DisplayFormat(temp));
 534
 535         NULLERROR(temp = IMG_Load(add_path("banners/game.png")));
 536         NULLERROR(surf_b_game = SDL_DisplayFormat(temp));
 537
 538         NULLERROR(temp = IMG_Load(add_path("banners/over.png")));
 539         NULLERROR(surf_b_over = SDL_DisplayFormat(temp));
 540
 541         surf_font_big = IMG_Load(add_path(BIG_FONT_FILE));
 542         g_font = SFont_InitFont(surf_font_big);
 543
 544         // Load the spaceship graphic.
 545         NULLERROR(temp = IMG_Load(add_path("sprites/ship.png")));
 546         NULLERROR(surf_ship = SDL_DisplayFormat(temp));
 547         get_shape(surf_ship, &shipshape);
 548
 549         // Load the life indicator (small ship) graphic.
 550         NULLERROR(temp = IMG_Load(add_path("indicators/life.png")));
 551         NULLERROR(surf_life = SDL_DisplayFormat(temp));
 552
 553         // Create the array of black points;
 554         SDL_LockSurface(surf_ship);
 555         raw_pixels = (Uint16 *) surf_ship->pixels;
 556         for(i = 0; i<surf_ship->w; i++) {
 557                 for(j = 0; j<surf_ship->h; j++) {
 558                         if(raw_pixels[j*(surf_ship->pitch)/2 + i] == 0) {
 559                                 blackptr->x = i;
 560                                 blackptr->y = j;
 561                                 blackptr++;
 562                         }
 563                 }
 564         }
 565
 566         SDL_UnlockSurface(surf_ship);
 567
 568         init_engine_dots();
 569         init_space_dots();
 570
 571         // Load all our lovely rocks
 572         for(i = 0; i<NROCKS; i++) {
 573
 574                 snprintf(a,MAX_PATH_LEN,add_path("sprites/rock%02d.png"),i);
 575                 NULLERROR(temp = IMG_Load(a));
 576                 NULLERROR(surf_rock[i] = SDL_DisplayFormat(temp));
 577                 get_shape(surf_rock[i], &rock_shapes[i]);
 578         }
 579
 580         // Remove the mouse cursor
 581 #ifdef SDL_DISABLE
 582         SDL_ShowCursor(SDL_DISABLE);
 583 #endif
 584
 585         return 0;
 586 }
 587
 588 int
 589 draw() {
 590         int i;
 591         SDL_Rect src,dest;
 592         struct black_point_struct *p;
 593         Uint16 *raw_pixels;
 594         int bang, offset, x;
 595         char *text;
 596         float fadegame,fadeover;
 597
 598         bang = 0;
 599
 600         src.x = 0;
 601         src.y = 0;
 602         dest.x = 0;
 603         dest.y = 0;
 604
 605         // Draw a fully black background
 606         SDL_FillRect(surf_screen,NULL,0);
 607
 608         // Draw the background dots
 609         drawdots(surf_screen);
 610
 611         // Draw ship
 612         if(!gameover && state == GAMEPLAY ) {
 613                 src.w = surf_ship->w;
 614                 src.h = surf_ship->h;
 615                 dest.w = src.w;
 616                 dest.h = src.h;
 617                 dest.x = (int)shipx;
 618                 dest.y = (int)shipy;
 619                 SDL_BlitSurface(surf_ship,&src,surf_screen,&dest);
 620         }
 621
 622         // Draw all the rocks, in all states
 623         for(i = 0; i<MAXROCKS; i++) {
 624                 if(rock[i].active) {
 625
 626                         src.w = rock[i].image->w;
 627                         src.h = rock[i].image->h;
 628                         dest.w = src.w;
 629                         dest.h = src.h;
 630                         dest.x = (int) rock[i].x;
 631                         dest.y = (int) rock[i].y;
 632
 633                         // Draw the rock
 634                         SDL_BlitSurface(rock[i].image,&src,surf_screen,&dest);
 635
 636                 }
 637         }
 638
 639         // If it's game over, show the game over graphic in the dead centre
 640         switch (state) {
 641                 case GAME_OVER:
 642                         if(fadetimer<3.0/faderate) {
 643                                 fadegame = fadetimer/(3.0/faderate);
 644                         } else {
 645                                 fadegame = 1.0;
 646                         }
 647
 648                         if(fadetimer<3.0/faderate) {
 649                                 fadeover = 0.0;
 650                         } else if(fadetimer<6.0/faderate) {
 651                                 fadeover = ((3.0/faderate)-fadetimer)/(6.0/faderate);
 652                         } else {
 653                                 fadeover = 1.0;
 654                         }
 655
 656                         src.w = surf_b_game->w;
 657                         src.h = surf_b_game->h;
 658                         dest.w = src.w;
 659                         dest.h = src.h;
 660                         dest.x = (XSIZE-src.w)/2;
 661                         dest.y = (YSIZE-src.h)/2-40;
 662                         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(fadegame*(200 + 55*cos(fadetimer += movementrate/1.0))));
 663                         SDL_BlitSurface(surf_b_game,&src,surf_screen,&dest);
 664
 665                         src.w = surf_b_over->w;
 666                         src.h = surf_b_over->h;
 667                         dest.w = src.w;
 668                         dest.h = src.h;
 669                         dest.x = (XSIZE-src.w)/2;
 670                         dest.y = (YSIZE-src.h)/2 + 40;
 671                         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(fadeover*(200 + 55*sin(fadetimer))));
 672                         SDL_BlitSurface(surf_b_over,&src,surf_screen,&dest);
 673                 break;
 674
 675                 case TITLE_PAGE:
 676
 677                         src.w = surf_b_variations->w;
 678                         src.h = surf_b_variations->h;
 679                         dest.w = src.w;
 680                         dest.h = src.h;
 681                         dest.x = (XSIZE-src.w)/2 + cos(fadetimer/6.5)*10;
 682                         dest.y = (YSIZE/2-src.h)/2 + sin(fadetimer/5.0)*10;
 683                         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer += movementrate/2.0)));
 684                         SDL_BlitSurface(surf_b_variations,&src,surf_screen,&dest);
 685
 686                         src.w = surf_b_on->w;
 687                         src.h = surf_b_on->h;
 688                         dest.w = src.w;
 689                         dest.h = src.h;
 690                         dest.x = (XSIZE-src.w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 691                         dest.y = (YSIZE/2-src.h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 692                         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 693                         SDL_BlitSurface(surf_b_on,&src,surf_screen,&dest);
 694
 695                         src.w = surf_b_rockdodger->w;
 696                         src.h = surf_b_rockdodger->h;
 697                         dest.w = src.w;
 698                         dest.h = src.h;
 699                         dest.x = (XSIZE-src.w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 700                         dest.y = (YSIZE/2-src.h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 701                         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 702                         SDL_BlitSurface(surf_b_rockdodger,&src,surf_screen,&dest);
 703
 704                         text = "Version " VERSION;
 705                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 706                         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 707
 708                         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 709                         //text = "Press SPACE to start!";
 710                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 711                         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 712                 break;
 713
 714                 case HIGH_SCORE_ENTRY:
 715                         play_tune(2);
 716                         if(!process_score_input()) {  // done inputting name
 717
 718                                 // Change state to briefly show high scores page
 719                                 state = HIGH_SCORE_DISPLAY;
 720                                 state_timeout = 200;
 721
 722                                 // Write the high score table to the file
 723                                 write_high_score_table();
 724
 725                                 // Play the title page tune
 726                                 play_tune(0);
 727                         }
 728                 // FALL THROUGH TO
 729                 case HIGH_SCORE_DISPLAY:
 730                         // Display de list o high scores mon.
 731                         display_scores(surf_screen, 150,50);
 732                         break;
 733                 case GAMEPLAY:
 734                 case DEAD_PAUSE:
 735                         ; // no action necessary
 736         }
 737
 738         if(!gameover && state == GAMEPLAY) {
 739                 for(i=0; i<MAXROCKS; i++) {
 740                         if(rock[i].active) {
 741                                 if(collide(shipx-rock[i].x, shipy-rock[i].y, rock[i].shape, &shipshape))
 742                                         bang = 1;
 743                         }
 744                 }
 745                 /*
 746                 SDL_LockSurface(surf_screen);
 747                 raw_pixels = (Uint16 *) surf_screen->pixels;
 748                 // Check that the black points on the ship are
 749                 // still black, and not covered up by rocks.
 750                 for(p = black_point; p<blackptr; p++) {
 751                         offset = surf_screen->pitch/2 * (p->y + (int)shipy) + p->x + (int)shipx;
 752                         if(raw_pixels[offset]) {
 753                                 // Set the bang flag
 754                                 bang = 1;
 755                         }
 756                 }
 757                 SDL_UnlockSurface(surf_screen);
 758                 */
 759         }
 760
 761         // Draw all the little ships
 762         if(state == GAMEPLAY || state == DEAD_PAUSE || state == GAME_OVER)
 763         for(i = 0; i<nships-1; i++) {
 764                 src.w = surf_life->w;
 765                 src.h = surf_life->h;
 766                 dest.w = src.w;
 767                 dest.h = src.h;
 768                 dest.x = (i + 1)*(src.w + 10);
 769                 dest.y = 20;
 770                 SDL_BlitSurface(surf_life,&src,surf_screen,&dest);
 771         }
 772
 773
 774         // Update the score
 775         /*
 776         n = SDL_GetTicks()-initticks;
 777         if(score)
 778         ticks_since_last = n-score;
 779         score = n;
 780         */
 781
 782         ticks_since_last = SDL_GetTicks()-last_ticks;
 783         last_ticks = SDL_GetTicks();
 784         if(ticks_since_last>200 || ticks_since_last<0) {
 785                 movementrate = 0;
 786         }
 787         else {
 788                 movementrate = ticks_since_last/50.0;
 789                 if(state == GAMEPLAY) {
 790                         score += ticks_since_last;
 791                 }
 792         }
 793
 794         // Update the surface
 795         SDL_Flip(surf_screen);
 796
 797
 798         return bang;
 799 }
 800
 801 int
 802 gameloop() {
 803         int i = 0;
 804         Uint8 *keystate;
 805
 806
 807         for(;;) {
 808                 if(!paused) {
 809                         // Count down the game loop timer, and change state when it gets to zero or less;
 810
 811                         if((state_timeout -= movementrate*3) < 0) {
 812                                 switch(state) {
 813                                         case DEAD_PAUSE:
 814                                                 // Create a new ship and start all over again
 815                                                 state = GAMEPLAY;
 816                                                 play_tune(1);
 817                                                 shipx -= 50;
 818                                                 break;
 819                                         case GAME_OVER:
 820                                                 state = HIGH_SCORE_ENTRY;
 821                                                 state_timeout = 5.0e6;
 822                                                 if(new_high_score(score)) {
 823                                                         SDL_Event e;
 824                                                         SDL_EnableUNICODE(1);
 825                                                         while(SDL_PollEvent(&e))
 826                                                                 ;
 827                                                 } else {
 828                                                         state = HIGH_SCORE_DISPLAY;
 829                                                         state_timeout = 400;
 830                                                 }
 831                                                 break;
 832                                         case HIGH_SCORE_DISPLAY:
 833                                                 state = TITLE_PAGE;
 834                                                 state_timeout = 500.0;
 835                                                 break;
 836                                         case HIGH_SCORE_ENTRY:
 837                                                 // state = TITLE_PAGE;
 838                                                 // play_tune(1);
 839                                                 // state_timeout = 100.0;
 840                                                 break;
 841                                         case TITLE_PAGE:
 842                                                 state = HIGH_SCORE_DISPLAY;
 843                                                 state_timeout = 200.0;
 844                                                 break;
 845                                         case GAMEPLAY:
 846                                                 ; // no action necessary
 847                                 }
 848                         } else {
 849                                 if(state == DEAD_PAUSE) {
 850                                         float blast_radius;
 851                                         int fixonly;
 852
 853                                         if(state_timeout < DEAD_PAUSE_LENGTH - 20.0) {
 854                                                 blast_radius = BLAST_RADIUS * 1.3;
 855                                                 fixonly = 1;
 856                                         } else {
 857                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 858                                                 fixonly = 0;
 859                                         }
 860
 861                                         if(shipx < 60) shipx = 60;
 862                                         for(i = 0; i<MAXROCKS; i++ ) {
 863                                                 float dx, dy, n;
 864                                                 if(rock[i].x <= 0) continue;
 865
 866                                                 // This makes it so your explosion from dying magically doesn't leave
 867                                                 // any rocks that aren't moving much on the x axis. After the first
 868                                                 // 20 tics, only rocks that are barely moving will be pushed.
 869                                                 if(fixonly && (!rock[i].dead || rock[i].dx < -4 || rock[i].dx > 3)) {
 870                                                         continue;
 871                                                 }
 872
 873                                                 dx = rock[i].x - shipx;
 874                                                 dy = rock[i].y - shipy;
 875
 876                                                 n = sqrt(dx*dx + dy*dy);
 877                                                 if(n < blast_radius) {
 878                                                         n *= 20;
 879                                                         rock[i].dx += rockrate*(dx+30)/n;
 880                                                         rock[i].dy += rockrate*dy/n;
 881                                                         rock[i].dead = 1;
 882                                                 }
 883                                         }
 884                                 }
 885                         }
 886
 887                         if(--countdown <= 0 && (rnd()*100.0<(rockrate += 0.025))) {
 888                                 // Create a rock
 889                                 rockptr++;
 890                                 if(rockptr-rock >= MAXROCKS) {
 891                                         rockptr = rock;
 892                                 }
 893                                 if(!rockptr->active) {
 894                                         rockptr->x = (float)XSIZE;
 895                                         rockptr->dx = -(rockspeed)*(1 + rnd());
 896                                         rockptr->dy = rnd()-0.5;
 897                                         rockptr->type_number = random() % NROCKS;
 898                                         rockptr->image = surf_rock[rockptr->type_number];// [random()%NROCKS];
 899                                         rockptr->shape = &rock_shapes[rockptr->type_number];
 900                                         rockptr->active = 1;
 901                                         rockptr->y = rnd()*(YSIZE + rockptr->image->h);
 902                                 }
 903                                 if(movementrate>0.1) {
 904                                         countdown = (int)(ROCKRATE/movementrate);
 905                                 } else {
 906                                         countdown = 0;
 907                                 }
 908                         }
 909
 910                         // FRICTION?
 911                         if(friction) {
 912                                 shipdx *= pow((double)0.9,(double)movementrate);
 913                                 shipdy *= pow((double)0.9,(double)movementrate);
 914                                 // if(abs(shipdx)<0.00001) shipdx = 0;
 915                                 // if(abs(shipdy)<0.00001) shipdy = 0;
 916                         }
 917
 918                         // INERTIA
 919                         shipx += shipdx*movementrate;
 920                         shipy += shipdy*movementrate;
 921
 922                         // SCROLLING
 923                         yscroll = shipy - (YSIZE / 2);
 924                         yscroll += shipdy * 25;
 925                         yscroll /= -25;
 926                         yscroll = ((scrollvel * (12 - movementrate)) + (yscroll * movementrate)) / 12;
 927                         scrollvel = yscroll;
 928                         yscroll = yscroll*movementrate;
 929                         shipy += yscroll;
 930
 931                         // Move all the rocks
 932                         for(i = 0; i < MAXROCKS; i++) {
 933                                 if(rock[i].active) {
 934                                         rock[i].x += rock[i].dx*movementrate;
 935                                         rock[i].y += rock[i].dy*movementrate + yscroll;
 936                                         if(rock[i].y > YSIZE || rock[i].y < -rock[i].image->h) {
 937                                                 if(rock[i].dead) {
 938                                                         rock[i].dead = 0;
 939                                                         rock[i].active = 0;
 940                                                 } else {
 941                                                         // wrap
 942                                                         rock[i].y = (YSIZE - rock[i].image->h) - rock[i].y;
 943                                                         rock[i].y += (rock[i].dy*movementrate + yscroll) * 1.01;
 944                                                 }
 945                                         }
 946                                         if(rock[i].x < -rock[i].image->w || rock[i].x > XSIZE) {
 947                                                 rock[i].active = 0;
 948                                                 rock[i].dead = 0;
 949                                         }
 950                                 }
 951                         }
 952
 953
 954                         // BOUNCE X
 955                         if(shipx<0 || shipx>XSIZE-surf_ship->w) {
 956                                 // BOUNCE from left and right wall
 957                                 shipx -= shipdx*movementrate;
 958                                 shipdx *= -0.99;
 959                         }
 960
 961                         // BOUNCE Y
 962                         if(shipy<0 || shipy>YSIZE-surf_ship->h) {
 963                                 // BOUNCE from top and bottom wall
 964                                 shipy -= shipdy;
 965                                 shipdy *= -0.99;
 966                         }
 967
 968
 969                         if(draw() && state == GAMEPLAY) {
 970                                 // Play the explosion sound
 971                                 play_sound(0);
 972                                 makebangdots(shipx,shipy,shipdx,shipdy,surf_ship,30);
 973                                 if(--nships <= 0) {
 974                                         gameover = 1;
 975                                         state = GAME_OVER;
 976                                         state_timeout = 200.0;
 977                                         fadetimer = 0.0;
 978                                         faderate = movementrate;
 979                                 }
 980                                 else {
 981                                         state = DEAD_PAUSE;
 982                                         state_timeout = DEAD_PAUSE_LENGTH;
 983                                         shipdx = 0;
 984                                         shipdy = 0;
 985                                 }
 986                         }
 987
 988                         SDL_PumpEvents();
 989                         keystate = SDL_GetKeyState(NULL);
 990
 991                         if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE])) {
 992                                 return 0;
 993                         }
 994
 995                         if(keystate[SDLK_SPACE] && (state == HIGH_SCORE_DISPLAY || state == TITLE_PAGE)) {
 996
 997                                 for(i = 0; i<MAXROCKS; i++ ) {
 998                                         rock[i].active = 0;
 999                                         rock[i].dead = 0;
1000                                 }
1001
1002                                 rockrate = 54.0;
1003                                 rockspeed = 5.0;
1004
1005                                 nships = 4;
1006                                 score = 0;
1007
1008                                 state = GAMEPLAY;
1009                                 play_tune(1);
1010
1011                                 gameover = 0;
1012                                 shipx = 0;
1013                                 shipy = YSIZE/2;
1014                                 shipdx = -1;
1015                                 shipdy = 0;
1016                         }
1017
1018                         maneuver = 0;
1019                 } else {
1020                         SDL_PumpEvents();
1021                         keystate = SDL_GetKeyState(NULL);
1022                 }
1023
1024                 if(state == GAMEPLAY) {
1025                         if(!gameover) {
1026
1027                                 if(!paused) {
1028                                         if(keystate[SDLK_UP] | keystate[SDLK_c])                { shipdy -= 1.5*movementrate; maneuver |= 1<<3;}
1029                                         if(keystate[SDLK_DOWN] | keystate[SDLK_t])              { shipdy += 1.5*movementrate; maneuver |= 1<<1;}
1030                                         if(keystate[SDLK_LEFT] | keystate[SDLK_h])              { shipdx -= 1.5*movementrate; maneuver |= 1<<2;}
1031                                         if(keystate[SDLK_RIGHT] | keystate[SDLK_n])             { shipdx += 1.5*movementrate; maneuver |= 1;}
1032                                         if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
1033                                 }
1034
1035                                 if(keystate[SDLK_p] | keystate[SDLK_s]) {
1036                                         if(!pausedown) {
1037                                                 paused = !paused;
1038                                                 pausedown = 1;
1039                                         }
1040                                 } else {
1041                                         pausedown = 0;
1042                                 }
1043
1044                         }
1045                         else {
1046                                 paused = 0;
1047                                 pausedown = 0;
1048                         }
1049                 } else if(state == GAME_OVER) {
1050                         if(keystate[SDLK_SPACE]) {
1051                                 state_timeout = -1;
1052                         }
1053                 }
1054         }
1055 }
1056
1057 int
1058 main(int argc, char **argv) {
1059         int i, x, fullscreen;
1060
1061         fullscreen = 0;
1062         tail_plume = 0;
1063         friction = 0;
1064         sound_flag = 1;
1065         music_flag = 0;
1066
1067         while ((x = getopt(argc,argv,"efhmps")) >= 0) {
1068                 switch(x) {
1069                         case 'e': // engine
1070                                 tail_plume = 1;
1071                         break;
1072                         case 'f': // fullscreen
1073                                 fullscreen = 1;
1074                         break;
1075                         case 'h': // help
1076                                 printf("Variations on RockDodger\n"
1077                                        " -e big tail [E]ngine\n"
1078                                        " -f [F]ull screen\n"
1079                                        " -h this [H]elp message\n"
1080                                        " -m enable [M]usic\n"
1081                                        " -p original [P]hysics (friction)\n"
1082                                        " -s [S]ilent (no sound)\n");
1083                                 exit(0);
1084                         break;
1085                         case 'm': // music
1086                                 music_flag = 1;
1087                         case 'p': // physics
1088                                 friction = 1;
1089                         break;
1090                         case 's': // silent
1091                                 sound_flag = 0;
1092                                 music_flag = 0;
1093                         break;
1094                 }
1095         }
1096
1097         if(init(fullscreen)) {
1098                 printf ("ta: '%s'\n",initerror);
1099                 return 1;
1100         }
1101
1102         for(i = 0; i<MAXROCKS; i++) {
1103                 rock[i].active = 0;
1104                 rock[i].dead = 0;
1105         }
1106         rockrate = 54.0;
1107         rockspeed = 5.0;
1108         initticks = SDL_GetTicks();
1109         gameloop();
1110
1111         return 0;
1112 }