game.c

   1
   2 /**
   3  *
   4  * Tennix! SDL Port
   5  * Copyright (C) 2003, 2007, 2008 Thomas Perl <thp@perli.net>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your 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., 51 Franklin Street, Fifth Floor, Boston,
  20  * MA  02110-1301, USA.
  21  *
  22  **/
  23
  24 #include <stdio.h>
  25 #include <math.h>
  26
  27 #include "tennix.h"
  28 #include "game.h"
  29 #include "graphics.h"
  30 #include "input.h"
  31 #include "sound.h"
  32
  33
  34 GameState *gamestate_new() {
  35     int x, y, z;
  36     GameState *s;
  37
  38     GameState template = {
  39         { 0, 0, 0.0, 0.0, 0.0 },
  40         { 0, 0, 0, 0, 0 },
  41         { GAME_X_MIN-RACKET_X_MID*2, GAME_Y_MID, 0, 0, 1, DESIRE_NORMAL, PLAYER_TYPE_HUMAN, GAME_Y_MID, false, 0, {0}, 0, 0, PLAYER_ACCEL_DEFAULT, true },
  42         { GAME_X_MAX+RACKET_X_MID*2, GAME_Y_MID, 0, 0, 0, DESIRE_NORMAL, PLAYER_TYPE_AI, GAME_Y_MID, false, 0, {0}, 0, 0, PLAYER_ACCEL_DEFAULT, true },
  43         0,
  44         0,
  45         0,
  46         true,
  47         "welcome to tennix " VERSION,
  48         { 0 },
  49         { 0 },
  50         REFEREE_NORMAL,
  51         0,
  52         WINNER_NONE,
  53         false,
  54         GR_CTT_GRASS,
  55         -1,
  56         { 0 },
  57         0,
  58         false,
  59         { { { 0 } } },
  60         0.0,
  61         SOUND_MAX,
  62         0.0,
  63         0.0,
  64         0,
  65         0,
  66         0,
  67         false,
  68         0,
  69         0
  70     };
  71
  72     s = (GameState*)malloc(sizeof(GameState));
  73     if (s == NULL) abort();
  74
  75     memcpy(s, &template, sizeof(GameState));
  76
  77     game_setup_serve(s);
  78
  79     /* smoothen n-gram */
  80     for( x = 0; x<NGRAM_STEPS; x++) {
  81         for( y = 0; y<NGRAM_STEPS; y++) {
  82             for( z = 0; z<NGRAM_STEPS; z++) {
  83                 s->ngram[x][y][z] = 1;
  84             }
  85         }
  86     }
  87
  88     return s;
  89 }
  90
  91
  92 void gameloop(GameState *s) {
  93     strcpy(s->game_score_str, format_game(s));
  94     strcpy(s->sets_score_str, format_sets(s));
  95
  96     Uint32 ot = SDL_GetTicks();
  97     Uint32 nt;
  98     Uint32 dt = GAME_TICKS;
  99     Uint32 diff;
 100     Uint32 accumulator = 0;
 101     bool quit = false;
 102
 103 #ifdef ENABLE_FPS_LIMIT
 104     Uint32 ft, frames; /* frame timer and frames */
 105 #endif
 106
 107     if (s->rain > 0) {
 108         play_sample_background(SOUND_RAIN);
 109     }
 110     play_sample_loop(SOUND_AUDIENCE);
 111     /* Reset the court type, so it is redrawn on first display */
 112     s->old_court_type = -1;
 113
 114 #ifdef ENABLE_FPS_LIMIT
 115     frames = 0;
 116     ft = SDL_GetTicks();
 117 #endif
 118     while( !quit) {
 119         nt = SDL_GetTicks();
 120         diff = nt-ot;
 121         if( diff > 2000) {
 122             diff = 0;
 123         }
 124
 125         accumulator += diff;
 126         ot = nt;
 127
 128         while( accumulator >= dt) {
 129             quit = step(s);
 130             s->time += dt;
 131             s->windtime += s->wind*dt;
 132             accumulator -= dt;
 133
 134             if( s->was_stopped) {
 135                 ot = SDL_GetTicks();
 136                 s->was_stopped = false;
 137             }
 138         }
 139
 140 #ifdef ENABLE_FPS_LIMIT
 141         while (frames*1000.0/((float)(SDL_GetTicks()-ft+1))>(float)(DEFAULT_FPS)) {
 142             SDL_Delay(10);
 143         }
 144         frames++;
 145 #endif
 146
 147         render(s);
 148     }
 149
 150     clear_screen();
 151     store_screen();
 152
 153     stop_sample(SOUND_AUDIENCE);
 154     stop_sample(SOUND_RAIN);
 155 }
 156
 157 bool step( GameState* s) {
 158     Uint8 *keys;
 159     SDL_Event e;
 160
 161     if( get_phase( s) < 1.0) {
 162         if( !s->ground.jump) {
 163             s->play_sound = SOUND_GROUND;
 164
 165             if( IS_OUT_Y( s->ball.y)) {
 166                 /* out - responsibilities stay the same */
 167                 s->status = "out!";
 168                 s->play_sound = SOUND_OUT;
 169                 s->referee = REFEREE_OUT;
 170             } else {
 171                 /* not out - responsibilities change */
 172                 s->player1.responsible = !(s->player2.responsible = !s->player2.responsible);
 173                 s->status = format_status( s);
 174                 s->referee = REFEREE_NORMAL;
 175             }
 176         }
 177         s->ground.jump = 3;
 178         s->ground.x = s->ball.x;
 179         s->ground.y = s->ball.y;
 180     } else {
 181         if( s->ground.jump && !(s->time%5)) s->ground.jump--;
 182     }
 183
 184     if( IS_OUT_X(s->ball.x) || IS_OFFSCREEN_Y(s->ball.y)) {
 185         if( IS_OFFSCREEN( s->ball.x, s->ball.y)) {
 186             s->player1_serves = s->player1.responsible;
 187
 188             score_game( s, s->player2.responsible);
 189             strcpy( s->game_score_str, format_game( s));
 190             strcpy( s->sets_score_str, format_sets( s));
 191
 192             if( s->player1.responsible) {
 193                 if( s->player1.type == PLAYER_TYPE_HUMAN && s->player2.type == PLAYER_TYPE_AI) {
 194                     s->status = "computer scores";
 195                 } else {
 196                     s->status = "player 2 scores";
 197                 }
 198                 s->referee = REFEREE_PLAYER2;
 199             } else {
 200                 if( s->player1.type == PLAYER_TYPE_HUMAN && s->player2.type == PLAYER_TYPE_AI) {
 201                     s->status = "player scores";
 202                 } else {
 203                     s->status = "player 1 scores";
 204                 }
 205                 s->referee = REFEREE_PLAYER1;
 206             }
 207
 208             game_setup_serve( s);
 209             s->play_sound = SOUND_APPLAUSE;
 210             SDL_Delay( 500);
 211             s->was_stopped = true;
 212             s->history_size = 0;
 213             s->history_is_locked = 0;
 214             s->ngram_prediction = 0.0;
 215 #ifdef DEBUG
 216             printf( "-- game reset --\n");
 217 #endif
 218         }
 219
 220         if( IS_OUT_X(s->ball.x)) {
 221             if( !s->history_is_locked && s->referee != REFEREE_OUT) {
 222                 s->history[s->history_size] = (int)(NGRAM_STEPS*s->ball.y/HEIGHT);
 223                 s->history_size++;
 224                 if( s->history_size == 3) {
 225                     s->ngram[s->history[0]][s->history[1]][s->history[2]] += 10;
 226 #ifdef DEBUG
 227                     printf( "history: %d, %d, %d\n", s->history[0], s->history[1], s->history[2]);
 228 #endif
 229                     s->ngram_prediction = ngram_predictor( s);
 230                     s->history[0] = s->history[1];
 231                     s->history[1] = s->history[2];
 232                     s->history_size--;
 233                 }
 234                 s->history_is_locked = true;
 235             }
 236             if( s->ball.move_x <= 0 && IS_NEAR_X( s->player1.x, s->ball.x) && IS_NEAR_Y( s->player1.y, s->ball.y) && s->player1.state && s->referee != REFEREE_OUT) {
 237                 s->ball.x = GAME_X_MIN;
 238                 if( s->player1.state == PLAYER_STATE_MAX) {
 239                     s->ball.move_x = PLAYER_POWERSHOT;
 240                 } else {
 241                     s->ball.move_x = 2.5 + 2.0*s->player1.state/PLAYER_STATE_MAX;
 242                 }
 243                 s->ball.move_y = get_move_y( s, 1);
 244                 s->player2.responsible = !(s->player1.responsible = 1);
 245                 s->ball.jump += 1.0-2.0*(s->player1.state<5);
 246                 s->play_sound = SOUND_RACKET;
 247                 pan_sample(SOUND_RACKET, 0.4);
 248             } else if( s->ball.move_x >= 0 && IS_NEAR_X( s->player2.x, s->ball.x) && IS_NEAR_Y( s->player2.y, s->ball.y) && s->player2.state && s->referee != REFEREE_OUT) {
 249                 s->ball.x = GAME_X_MAX;
 250                 if( s->player2.state == PLAYER_STATE_MAX) {
 251                     s->ball.move_x = -PLAYER_POWERSHOT;
 252                 } else {
 253                     s->ball.move_x = -(2.5 + 2.0*s->player2.state/PLAYER_STATE_MAX);
 254                 }
 255                 s->ball.move_y = get_move_y( s, 2);
 256                 s->player1.responsible = !(s->player2.responsible = 1);
 257                 s->ball.jump += 1.0-2.0*(s->player2.state<5);
 258                 s->play_sound = SOUND_RACKET;
 259                 pan_sample(SOUND_RACKET, 0.6);
 260             }
 261         }
 262     } else {
 263         s->history_is_locked = false;
 264     }
 265
 266     SDL_PollEvent( &e);
 267     keys = SDL_GetKeyState( NULL);
 268     switch(e.type) {
 269         case SDL_JOYAXISMOTION:
 270             if (e.jaxis.axis == JOYSTICK_Y_AXIS) {
 271                 s->joystick_y = JOYSTICK_PERCENTIZE(e.jaxis.value);
 272             } else if (e.jaxis.axis == JOYSTICK_X_AXIS) {
 273                 s->joystick_x = JOYSTICK_PERCENTIZE(e.jaxis.value);
 274             }
 275             break;
 276         case SDL_JOYBUTTONUP: case SDL_JOYBUTTONDOWN:
 277             if (e.jbutton.button == JOYSTICK_BUTTON_A) {
 278                 s->joystick_a = (e.jbutton.state == SDL_PRESSED);
 279             }
 280             break;
 281     }
 282
 283     if( s->time%50==0) {
 284         /**
 285          * Maemo keys:
 286          * F7 = "Decrease" key
 287          * F8 = "Increase" key
 288          **/
 289         if (keys['c'] || keys[SDLK_F8]) {
 290             s->court_type++;
 291         } else if (keys[SDLK_F7]) {
 292             s->court_type--;
 293         }
 294         if (keys['r']) {
 295             if (s->rain == 0) {
 296                 play_sample_background(SOUND_RAIN);
 297             }
 298             s->rain += 10;
 299         }
 300         if (keys['t']) {
 301             s->fog++;
 302         }
 303         if (keys['1']) {
 304             s->wind++;
 305         }
 306         if (keys['2']) {
 307             s->wind--;
 308         }
 309         if (keys['n']) {
 310             s->night = 1 - s->night;
 311         }
 312         if( s->court_type > GR_CTT_LAST) {
 313             s->court_type = GR_CTT_FIRST;
 314         } else if (s->court_type < GR_CTT_FIRST) {
 315             s->court_type = GR_CTT_LAST;
 316         }
 317     }
 318
 319     if( !is_fading() && !s->is_over) {
 320         if( s->player1.type == PLAYER_TYPE_HUMAN) {
 321            input_human( &s->player1,
 322                    keys['w'] || keys[SDLK_UP] || s->joystick_y < -JOYSTICK_TRESHOLD,
 323                    keys['s'] || keys[SDLK_DOWN] || s->joystick_y > JOYSTICK_TRESHOLD,
 324                    keys['d'] || keys[SDLK_SPACE] || keys[SDLK_LCTRL] || keys[SDLK_RETURN] || s->joystick_a,
 325 #ifdef ENABLE_MOUSE
 326                    true,
 327 #else
 328                    false,
 329 #endif
 330                    s);
 331         } else {
 332             input_ai( &s->player1, &s->ball, &s->player2, s);
 333         }
 334
 335         if( s->player2.type == PLAYER_TYPE_HUMAN) {
 336             input_human( &s->player2, keys['o'], keys['l'], keys['k'], false, s);
 337         } else {
 338             input_ai( &s->player2, &s->ball, &s->player1, s);
 339         }
 340     }
 341
 342     /* Maemo: The "F6" button is the "Fullscreen" button */
 343     if( keys['f'] || keys[SDLK_F6]) SDL_WM_ToggleFullScreen( screen);
 344     if( keys['y']) SDL_SaveBMP( screen, "screenshot.bmp");
 345
 346     /* Maemo: The "F4" button is the "Open menu" button */
 347     if( keys['p'] || keys[SDLK_F4]) {
 348         while( keys['p'] || keys[SDLK_F4]) {
 349             SDL_PollEvent( &e);
 350             keys = SDL_GetKeyState( NULL);
 351             SDL_Delay( 10);
 352         }
 353         while( (keys['p'] || keys[SDLK_F4]) == 0) {
 354             SDL_PollEvent( &e);
 355             keys = SDL_GetKeyState( NULL);
 356             SDL_Delay( 10);
 357         }
 358         while( keys['p'] || keys[SDLK_F4]) {
 359             SDL_PollEvent( &e);
 360             keys = SDL_GetKeyState( NULL);
 361             SDL_Delay( 10);
 362         }
 363         s->was_stopped = true;
 364     }
 365
 366     if( keys[SDLK_ESCAPE] || keys['q']) return true;
 367
 368     limit_value( &s->player1.y, PLAYER_Y_MIN, PLAYER_Y_MAX);
 369     limit_value( &s->player2.y, PLAYER_Y_MIN, PLAYER_Y_MAX);
 370     limit_value( &s->ball.jump, BALL_JUMP_MIN, BALL_JUMP_MAX);
 371
 372     /* Update ball_dest for debugging purposes */
 373     get_move_y(s, 1);
 374     get_move_y(s, 2);
 375
 376     if (s->ball.move_x > 0 && s->wind > 0) {
 377         s->ball.x += fabsf(s->wind)/2;
 378     } else if (s->ball.move_x < 0 && s->wind < 0) {
 379         s->ball.x -= fabsf(s->wind)/2;
 380     }
 381
 382     s->ball.x += s->ball.move_x;
 383     s->ball.y += s->ball.move_y;
 384
 385     if(s->player1.state) s->player1.state--;
 386     if(s->player2.state) s->player2.state--;
 387
 388     return false;
 389 }
 390
 391 void render( GameState* s) {
 392     int i, x, y;
 393 #ifdef EXTENDED_REFEREE
 394     int t=1000;
 395 #endif
 396     if (s->play_sound != SOUND_MAX) {
 397         play_sample(s->play_sound);
 398         s->play_sound = SOUND_MAX;
 399     }
 400     if( s->winner != WINNER_NONE) {
 401         if( !s->is_over) {
 402             start_fade();
 403             s->is_over = true;
 404         }
 405         clear_screen();
 406         store_screen();
 407         show_sprite( GR_RACKET, 2*(s->winner-1), 4, WIDTH/2 - get_image_width( GR_RACKET)/8, HEIGHT/2 - get_image_height( GR_RACKET), 255);
 408         sprintf( s->game_score_str, "player %d wins the match with %s", s->winner, format_sets( s));
 409         font_draw_string( GR_DKC2_FONT, s->game_score_str, (WIDTH-font_get_string_width( GR_DKC2_FONT, s->game_score_str))/2, HEIGHT/2 + 30, s->time/20, ANIMATION_WAVE | ANIMATION_BUNGEE);
 410         updatescr();
 411         return;
 412     }
 413     if (s->old_court_type != s->court_type) {
 414         clear_screen();
 415         fill_image(s->court_type, 120, 120, 400, 250);
 416         show_image(GR_COURT, 0, 0, 255);
 417         s->old_court_type = s->court_type;
 418         store_screen();
 419     }
 420 #ifdef EXTENDED_REFEREE
 421     switch (s->referee) {
 422         case REFEREE_NORMAL:
 423             t = 1000;
 424             break;
 425         case REFEREE_OUT:
 426             t = 200;
 427             break;
 428         case REFEREE_PLAYER1:
 429         case REFEREE_PLAYER2:
 430             t = 400;
 431             break;
 432     }
 433     t = (s->time/t)%4;
 434     switch (t) {
 435         case 0:
 436             t=0;
 437             break;
 438         case 1:
 439             t=1;
 440             break;
 441         case 2:
 442             t=0;
 443             break;
 444         case 3:
 445             t=2;
 446             break;
 447     }
 448     show_sprite( GR_REFEREE, s->referee*3+t, 12, 250, 10, 255);
 449 #else
 450     show_sprite( GR_REFEREE, s->referee, 4, 250, 10, 255);
 451 #endif
 452     if (voice_finished_flag == 0) {
 453         show_sprite(GR_TALK, (s->time/150)%2, 2, 280, 45, 255);
 454     }
 455     show_image( GR_SHADOW, s->ball.x-BALL_X_MID, s->ball.y + get_phase( s) - BALL_Y_MID, 255);
 456
 457     show_sprite( GR_RACKET, (!s->player1.state), 4, s->player1.x-RACKET_X_MID, s->player1.y-RACKET_Y_MID, 255);
 458     show_sprite( GR_RACKET, (!s->player2.state)+2, 4, s->player2.x-RACKET_X_MID, s->player2.y-RACKET_Y_MID, 255);
 459
 460     if( s->ball.move_x > 0) {
 461         show_sprite( GR_BALL, (s->time/500)%4, 4, s->ball.x-BALL_X_MID, s->ball.y-BALL_Y_MID, 255);
 462     } else if( s->ball.move_x < 0) {
 463         show_sprite( GR_BALL, 3-(s->time/500)%4, 4, s->ball.x-BALL_X_MID, s->ball.y-BALL_Y_MID, 255);
 464     } else {
 465         show_sprite( GR_BALL, 0, 4, s->ball.x-BALL_X_MID, s->ball.y-BALL_Y_MID, 255);
 466     }
 467
 468     /* Player 1's mouse rectangle */
 469     if (!(s->player1.mouse_locked)) {
 470         rectangle(s->player1.x-2+5, s->player1.mouse_y-2, 4, 4, 255, 255, 255);
 471         rectangle(s->player1.x-1+5, s->player1.mouse_y-1, 2, 2, 0, 0, 0);
 472     }
 473
 474     font_draw_string( GR_DKC2_FONT, s->game_score_str, 14, 14, 0, ANIMATION_NONE);
 475     font_draw_string( GR_DKC2_FONT, s->sets_score_str, (WIDTH-font_get_string_width( GR_DKC2_FONT, s->sets_score_str))-14, 14, 0, ANIMATION_NONE);
 476
 477     font_draw_string( GR_DKC2_FONT, s->status, (WIDTH-font_get_string_width( GR_DKC2_FONT, s->status))/2, HEIGHT-50, s->time/30, ANIMATION_WAVE);
 478
 479     for (i=0; i<s->rain; i++) {
 480         x = rand()%WIDTH;
 481         y = rand()%HEIGHT;
 482         draw_line_faded(x, y, x+10+s->wind*5, y+30, 0, 0, 255, 100, 200, 255);
 483     }
 484     if (s->rain) {
 485         /**
 486          * Cheap-ish update of the whole screen. This can
 487          * probably be optimized.
 488          **/
 489         update_rect(0, 0, WIDTH, HEIGHT);
 490     }
 491
 492 #ifdef DEBUG
 493     line_horiz( s->player1.y, 255, 0, 0);
 494     line_horiz( s->player2.y, 0, 0, 255);
 495     line_horiz( s->ball.y, 0, 255, 0);
 496
 497     line_vert( s->player1.x, 255, 0, 0);
 498     line_vert( s->player2.x, 0, 0, 255);
 499     line_vert( s->ball.x, 0, 255, 0);
 500
 501     line_horiz( s->player1.ball_dest, 255, 0, 255);
 502     line_horiz( s->player2.ball_dest, 0, 255, 255);
 503
 504     line_horiz( GAME_Y_MIN, 100, 100, 100);
 505     line_horiz( GAME_Y_MAX, 100, 100, 100);
 506 #endif
 507     switch (s->fog) {
 508         default:
 509         case 4:
 510             fill_image_offset(GR_FOG2, 0, 0, WIDTH, HEIGHT, -s->time/150-s->windtime/200, 0);
 511         case 3:
 512             fill_image_offset(GR_FOG, 0, 0, WIDTH, HEIGHT, -s->time/100-s->windtime/150, 20);
 513         case 2:
 514             fill_image_offset(GR_FOG2, 0, 0, WIDTH, HEIGHT, -s->time/180-s->windtime/180, 80);
 515         case 1:
 516             fill_image_offset(GR_FOG, 0, 0, WIDTH, HEIGHT, s->time/200-s->windtime/100, 0);
 517         case 0:
 518             break;
 519     }
 520     if (s->night) {
 521         show_image(GR_NIGHT, 0, 0, 255);
 522     }
 523
 524     updatescr();
 525 }
 526
 527 void limit_value( float* value, float min, float max) {
 528     if( *value < min) {
 529         *value = min;
 530     } else if( *value > max) {
 531         *value = max;
 532     }
 533 }
 534
 535 float get_phase( GameState* s) {
 536     float pos, fract;
 537     float x, min, max, direction;
 538
 539     x = s->ball.x;
 540     min = GAME_X_MIN;
 541     max = GAME_X_MAX;
 542     direction = s->ball.move_x;
 543
 544     pos = (direction>0)?(1-GROUND_PHASE):(GROUND_PHASE);
 545
 546     fract = (x-min)/(max-min);
 547
 548     if( fract < pos) {
 549         fract = fract/pos;
 550         return fabsf( cosf(PI*fract/2))*PHASE_AMP*s->ball.jump;
 551     } else {
 552         fract = (pos-fract)/(1-pos);
 553         return fabsf( sinf(PI*fract/2))*PHASE_AMP*s->ball.jump;
 554     }
 555 }
 556
 557 float get_move_y( GameState* s, unsigned char player) {
 558     float pct, dest, x_len, y_len;
 559     float py, by, pa, move_x;
 560
 561     py = (player==1)?(s->player1.y):(s->player2.y);
 562     by = s->ball.y;
 563     pa = RACKET_Y_MID*2;
 564     move_x = s->ball.move_x;
 565
 566     /* -1.0 .. 1.0 for racket hit position */
 567     pct = (by-py)/(pa/2);
 568     limit_value( &pct, -1.0, 1.0);
 569
 570     /* Y destination for ball */
 571     dest = GAME_Y_MID + pct*(GAME_Y_MAX-GAME_Y_MIN);
 572     if( player == 1) {
 573         s->player1.ball_dest = dest;
 574     } else {
 575         s->player2.ball_dest = dest;
 576     }
 577
 578     /* lengths for the ball's journey */
 579     if( player == 1) {
 580         x_len = fabsf(GAME_X_MAX - s->ball.x);
 581         y_len = dest - by + MOVE_Y_SEED-rand()%MOVE_Y_SEED*2;
 582     } else {
 583         x_len = s->ball.x - GAME_X_MIN;
 584         y_len = by - dest + MOVE_Y_SEED-rand()%MOVE_Y_SEED*2;
 585     }
 586
 587     /* return the should-be value for move_y */
 588     return (y_len*move_x)/(x_len);
 589 }
 590
 591 void input_human( Player* player, bool up, bool down, bool hit, bool use_mouse, GameState* s) {
 592     int diff = PLAYER_MOVE_Y;
 593     int mb;
 594
 595     /**
 596      * Only use mouse control if the user isn't pressing any buttons
 597      * this way, keyboard control still works when mouse control is
 598      * enabled.
 599      **/
 600     if (use_mouse && (down || up || hit)) {
 601         /**
 602          * this is here so if the user decides to play
 603          * with keyboard controls, we will lock the
 604          * mouse and disable displaying the mouse cursor
 605          **/
 606         player->mouse_locked = true;
 607     }
 608     if (use_mouse && !down && !up && !hit) {
 609         mb = SDL_GetMouseState(&(player->mouse_x), &(player->mouse_y));
 610         if (mb&SDL_BUTTON(SDL_BUTTON_LEFT)) {
 611             if (player->mouse_y < player->y) {
 612                 down = false;
 613                 up = true;
 614                 diff = (player->y-player->mouse_y<diff)?(player->y-player->mouse_y):(diff);
 615             } else if (player->mouse_y > player->y) {
 616                 up = false;
 617                 down = true;
 618                 diff = (player->mouse_y-player->y<diff)?(player->mouse_y-player->y):(diff);
 619             }
 620             player->mouse_locked = false;
 621         } else if (!player->mouse_locked) {
 622             hit = true;
 623         }
 624     }
 625
 626     if (fabsf(s->joystick_y) > JOYSTICK_TRESHOLD) {
 627         diff = PLAYER_MOVE_Y*fabsf(s->joystick_y)/40.0;
 628         if (diff > PLAYER_MOVE_Y) {
 629             diff = PLAYER_MOVE_Y;
 630         }
 631     }
 632
 633     if (up) {
 634         player->y -= fminf(diff, diff*player->accelerate);
 635         player->accelerate *= PLAYER_ACCEL_INCREASE;
 636     } else if (down) {
 637         player->y += fminf(diff, diff*player->accelerate);
 638         player->accelerate *= PLAYER_ACCEL_INCREASE;
 639     } else {
 640         player->accelerate = PLAYER_ACCEL_DEFAULT;
 641     }
 642
 643     if( hit) {
 644         if( !player->state && !player->state_locked) {
 645             player->state = PLAYER_STATE_MAX;
 646             player->state_locked = true;
 647         }
 648     } else {
 649         player->state_locked = false;
 650     }
 651 }
 652
 653 void input_ai( Player* player, Ball* ball, Player* opponent, GameState* s) {
 654     float fact = 1.7;
 655     float target;
 656
 657     if( fabsf( player->y - ball->y) > RACKET_Y_MID*5) {
 658         fact = 3.5;
 659     }
 660
 661     target = GAME_Y_MID + (opponent->ball_dest - GAME_Y_MID)/5;
 662
 663     if( player->responsible) {
 664         if( player->desire == DESIRE_NORMAL && !IS_NEAR_Y_AI( player->y, ball->y)) {
 665             if( player->y < ball->y) {
 666                 player->y += fmin( 2*fact, ball->y - player->y);
 667             } else if( player->y > ball->y) {
 668                 player->y -= fmin( 2*fact, player->y - ball->y);
 669             }
 670         }
 671
 672         if( (ball->move_x != 0 || IS_NEAR_Y_AI( player->y, ball->y)) && IS_NEAR_X_AI( player->x, ball->x) && !player->state && rand()%4==0) {
 673             player->state = PLAYER_STATE_MAX;
 674         }
 675     } else if( ball->move_x == 0) {
 676         if( player->desire == DESIRE_NORMAL && !IS_NEAR_Y_AI( player->y, target)) {
 677             if( player->y < target) {
 678                 player->y += fmin( fact, (target-player->y)/40.0);
 679             } else if( player->y > target) {
 680                 player->y -= fmin( fact, (player->y-target)/40.0);
 681             }
 682         }
 683     } else if( s->ngram_prediction > 0.0) {
 684         target = s->ngram_prediction*((float)HEIGHT)/((float)(NGRAM_STEPS));
 685         target = GAME_Y_MID + (target-GAME_Y_MID)*1.5;
 686
 687         if( player->desire == DESIRE_NORMAL && !IS_NEAR_Y_AI( player->y, target)) {
 688             if( player->y < target) {
 689                 player->y += fmin( fact, (target-player->y)/40.0);
 690             } else if( player->y > target) {
 691                 player->y -= fmin( fact, (player->y-target)/40.0);
 692             }
 693         }
 694     } else {/*
 695         if( player->desire == DESIRE_NORMAL) {
 696             if( !IS_NEAR_Y_AI( player->y, target)) {
 697                 player->y += (target - player->y)/40.0;
 698             }
 699         }*/
 700     }
 701 }
 702
 703 void game_setup_serve( GameState* s) {
 704     s->ball.jump = 7.5;
 705     s->ball.y = GAME_Y_MID;
 706     s->ball.move_x = 0.0;
 707     s->ball.move_y = 0.0;
 708
 709     if( s->player1_serves) {
 710         s->player1.responsible = true;
 711         s->player1.ball_dest = 0.0;
 712         s->ball.x = GAME_X_MIN-RACKET_X_MID*1.5;
 713     } else {
 714         s->player1.responsible = false;
 715         s->player2.ball_dest = 0.0;
 716         s->ball.x = GAME_X_MAX+RACKET_X_MID*1.5;
 717     }
 718
 719     s->player2.responsible = !(s->player1.responsible);
 720 }
 721
 722 float ngram_predictor( GameState* s) {
 723     unsigned int count = 0;
 724     unsigned long sum = 0;
 725     int x, y, z;
 726     float result;
 727
 728     if( s->history_size < 3) {
 729         return 0.0;
 730     }
 731
 732     x = s->history[1];
 733     y = s->history[2];
 734
 735     for( z = 0; z<NGRAM_STEPS; z++) {
 736         count += s->ngram[x][y][z];
 737         sum += z * s->ngram[x][y][z];
 738     }
 739
 740     result = ((float)(sum))/((float)(count));
 741 #ifdef DEBUG
 742     printf( "predicting next = %.2f\n", result);
 743 #endif
 744
 745     return result;
 746 }
 747
 748 void score_game( GameState* s, bool player1_scored) {
 749     Player* winner = (player1_scored)?(&(s->player1)):(&(s->player2));
 750     Player* loser = (player1_scored)?(&(s->player2)):(&(s->player1));
 751
 752     if( s->current_set >= SETS_TO_WIN*2-1) {
 753         return;
 754     }
 755
 756     winner->game++;
 757     if( loser->game < winner->game-1) {
 758         if( winner->game >= 4) {
 759             winner->game = loser->game = 0;
 760             winner->sets[s->current_set]++;
 761
 762 #ifdef HAVE_VOICE_FILES
 763             /* speak the current score */
 764             voice_say_list(4, VOICE_ZERO_IN + (s->player1.sets[s->current_set])*2, VOICE_TO, VOICE_ZERO_OUT + (s->player2.sets[s->current_set])*2, VOICE_IN_THE_FIRST_SET+s->current_set);
 765 #endif
 766
 767             /* scoring the set.. */
 768             if( (winner->sets[s->current_set] == 6 && loser->sets[s->current_set] < 5) ||
 769                 winner->sets[s->current_set] == 7) {
 770                 s->current_set++;
 771                 s->winner = game_get_winner( s);
 772             }
 773         }
 774     }
 775 }
 776
 777 char* format_sets( GameState* s) {
 778     static char sets[100];
 779     static char tmp[100];
 780     int i, max = s->current_set;
 781
 782     sets[0] = '\0';
 783
 784     if( s->winner != WINNER_NONE) {
 785         max--;
 786     }
 787     for( i=0; i<=max; i++) {
 788         sprintf( tmp, "%d:%d, ", s->player1.sets[i], s->player2.sets[i]);
 789         strcat( sets, tmp);
 790     }
 791
 792     sets[strlen(sets)-2] = '\0';
 793
 794     return sets;
 795 }
 796
 797 char* format_game( GameState* s) {
 798     static char game[100];
 799     static const int game_scoring[] = { 0, 15, 30, 40 };
 800
 801     if( s->player1.game < 4 && s->player2.game < 4) {
 802 #ifdef HAVE_VOICE_FILES
 803         if (s->player1.game > 0 || s->player2.game > 0) {
 804             if (s->player1.game == s->player2.game) {
 805                 voice_say_list(2, VOICE_LOVE_IN + 2*(s->player1.game), VOICE_ALL);
 806             } else {
 807                 voice_say_list(2, VOICE_LOVE_IN + 2*(s->player1.game), VOICE_LOVE_OUT + 2*(s->player2.game));
 808             }
 809         }
 810 #endif
 811         sprintf( game, "%d - %d", game_scoring[s->player1.game], game_scoring[s->player2.game]);
 812     } else if( s->player1.game > s->player2.game) {
 813 #ifdef HAVE_VOICE_FILES
 814         voice_say_list(1, VOICE_ADVANTAGE_PLAYER_ONE);
 815 #endif
 816         strcpy( game, "advantage player 1");
 817     } else if( s->player1.game < s->player2.game) {
 818 #ifdef HAVE_VOICE_FILES
 819         voice_say_list(1, VOICE_ADVANTAGE_PLAYER_TWO);
 820 #endif
 821         strcpy( game, "advantage player 2");
 822     } else {
 823 #ifdef HAVE_VOICE_FILES
 824         voice_say_list(1, VOICE_DEUCE);
 825 #endif
 826         strcpy( game, "deuce");
 827     }
 828
 829     return game;
 830 }
 831
 832 char* format_status( GameState* s) {
 833     static char status[100];
 834     static const char* set_names[] = { "first", "second", "third", "fourth", "fifth" };
 835
 836     sprintf( status, "%d:%d in %s set", s->player1.sets[s->current_set], s->player2.sets[s->current_set], set_names[s->current_set]);
 837
 838     return status;
 839 }
 840
 841 int game_get_winner( GameState* s) {
 842     int i;
 843     int sets[2] = {0};
 844
 845     for( i=0; i<s->current_set; i++) {
 846         if( s->player1.sets[i] > s->player2.sets[i]) {
 847             sets[0]++;
 848         } else {
 849             sets[1]++;
 850         }
 851     }
 852
 853     if( sets[0] == SETS_TO_WIN) return WINNER_PLAYER1;
 854     if( sets[1] == SETS_TO_WIN) return WINNER_PLAYER2;
 855
 856     return WINNER_NONE;
 857 }
 858