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         0
  71     };
  72
  73     s = (GameState*)malloc(sizeof(GameState));
  74     if (s == NULL) abort();
  75
  76     memcpy(s, &template, sizeof(GameState));
  77
  78     game_setup_serve(s);
  79
  80     /* smoothen n-gram */
  81     for( x = 0; x<NGRAM_STEPS; x++) {
  82         for( y = 0; y<NGRAM_STEPS; y++) {
  83             for( z = 0; z<NGRAM_STEPS; z++) {
  84                 s->ngram[x][y][z] = 1;
  85             }
  86         }
  87     }
  88
  89     return s;
  90 }
  91
  92
  93 void gameloop(GameState *s) {
  94     strcpy(s->game_score_str, format_game(s));
  95     strcpy(s->sets_score_str, format_sets(s));
  96
  97     Uint32 ot = SDL_GetTicks();
  98     Uint32 nt;
  99     Uint32 dt = GAME_TICKS;
 100     Uint32 diff;
 101     Uint32 accumulator = 0;
 102     bool quit = false;
 103
 104 #ifdef ENABLE_FPS_LIMIT
 105     Uint32 ft, frames; /* frame timer and frames */
 106 #endif
 107
 108     if (s->rain > 0) {
 109         play_sample_background(SOUND_RAIN);
 110     }
 111     play_sample_loop(SOUND_AUDIENCE);
 112     /* Reset the court type, so it is redrawn on first display */
 113     s->old_court_type = -1;
 114
 115 #ifdef ENABLE_FPS_LIMIT
 116     frames = 0;
 117     ft = SDL_GetTicks();
 118 #endif
 119     while( !quit) {
 120         nt = SDL_GetTicks();
 121         diff = nt-ot;
 122         if( diff > 2000) {
 123             diff = 0;
 124         }
 125
 126         accumulator += diff;
 127         ot = nt;
 128
 129         while( accumulator >= dt) {
 130             quit = step(s);
 131             s->time += dt;
 132             s->windtime += s->wind*dt;
 133             accumulator -= dt;
 134
 135             if( s->was_stopped) {
 136                 ot = SDL_GetTicks();
 137                 s->was_stopped = false;
 138             }
 139         }
 140         if (s->timelimit != 0 && s->time >= s->timelimit) {
 141             quit = 1;
 142         }
 143
 144 #ifdef ENABLE_FPS_LIMIT
 145         while (frames*1000.0/((float)(SDL_GetTicks()-ft+1))>(float)(DEFAULT_FPS)) {
 146             SDL_Delay(10);
 147         }
 148         frames++;
 149 #endif
 150
 151         render(s);
 152     }
 153
 154     clear_screen();
 155     store_screen();
 156
 157     stop_sample(SOUND_AUDIENCE);
 158     stop_sample(SOUND_RAIN);
 159 }
 160
 161 bool step( GameState* s) {
 162     Uint8 *keys;
 163     SDL_Event e;
 164
 165     if( get_phase( s) < 1.0) {
 166         if( !s->ground.jump) {
 167             s->play_sound = SOUND_GROUND;
 168
 169             if( IS_OUT_Y( s->ball.y)) {
 170                 /* out - responsibilities stay the same */
 171                 s->status = "out!";
 172                 s->play_sound = SOUND_OUT;
 173                 s->referee = REFEREE_OUT;
 174             } else {
 175                 /* not out - responsibilities change */
 176                 s->player1.responsible = !(s->player2.responsible = !s->player2.responsible);
 177                 s->status = format_status( s);
 178                 s->referee = REFEREE_NORMAL;
 179             }
 180         }
 181         s->ground.jump = 3;
 182         s->ground.x = s->ball.x;
 183         s->ground.y = s->ball.y;
 184     } else {
 185         if( s->ground.jump && !(s->time%5)) s->ground.jump--;
 186     }
 187
 188     if( IS_OUT_X(s->ball.x) || IS_OFFSCREEN_Y(s->ball.y)) {
 189         if( IS_OFFSCREEN( s->ball.x, s->ball.y)) {
 190             s->player1_serves = s->player1.responsible;
 191
 192             score_game( s, s->player2.responsible);
 193             strcpy( s->game_score_str, format_game( s));
 194             strcpy( s->sets_score_str, format_sets( s));
 195
 196             if( s->player1.responsible) {
 197                 if( s->player1.type == PLAYER_TYPE_HUMAN && s->player2.type == PLAYER_TYPE_AI) {
 198                     s->status = "computer scores";
 199                 } else {
 200                     s->status = "player 2 scores";
 201                 }
 202                 s->referee = REFEREE_PLAYER2;
 203             } else {
 204                 if( s->player1.type == PLAYER_TYPE_HUMAN && s->player2.type == PLAYER_TYPE_AI) {
 205                     s->status = "player scores";
 206                 } else {
 207                     s->status = "player 1 scores";
 208                 }
 209                 s->referee = REFEREE_PLAYER1;
 210             }
 211
 212             game_setup_serve( s);
 213             s->play_sound = SOUND_APPLAUSE;
 214             SDL_Delay( 500);
 215             s->was_stopped = true;
 216             s->history_size = 0;
 217             s->history_is_locked = 0;
 218             s->ngram_prediction = 0.0;
 219 #ifdef DEBUG
 220             printf( "-- game reset --\n");
 221 #endif
 222         }
 223
 224         if( IS_OUT_X(s->ball.x)) {
 225             if( !s->history_is_locked && s->referee != REFEREE_OUT) {
 226                 s->history[s->history_size] = (int)(NGRAM_STEPS*s->ball.y/HEIGHT);
 227                 s->history_size++;
 228                 if( s->history_size == 3) {
 229                     s->ngram[s->history[0]][s->history[1]][s->history[2]] += 10;
 230 #ifdef DEBUG
 231                     printf( "history: %d, %d, %d\n", s->history[0], s->history[1], s->history[2]);
 232 #endif
 233                     s->ngram_prediction = ngram_predictor( s);
 234                     s->history[0] = s->history[1];
 235                     s->history[1] = s->history[2];
 236                     s->history_size--;
 237                 }
 238                 s->history_is_locked = true;
 239             }
 240             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) {
 241                 s->ball.x = GAME_X_MIN;
 242                 if( s->player1.state == PLAYER_STATE_MAX) {
 243                     s->ball.move_x = PLAYER_POWERSHOT;
 244                 } else {
 245                     s->ball.move_x = 2.5 + 2.0*s->player1.state/PLAYER_STATE_MAX;
 246                 }
 247                 s->ball.move_y = get_move_y( s, 1);
 248                 s->player2.responsible = !(s->player1.responsible = 1);
 249                 s->ball.jump += 1.0-2.0*(s->player1.state<5);
 250                 s->play_sound = SOUND_RACKET;
 251                 pan_sample(SOUND_RACKET, 0.4);
 252             } 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) {
 253                 s->ball.x = GAME_X_MAX;
 254                 if( s->player2.state == PLAYER_STATE_MAX) {
 255                     s->ball.move_x = -PLAYER_POWERSHOT;
 256                 } else {
 257                     s->ball.move_x = -(2.5 + 2.0*s->player2.state/PLAYER_STATE_MAX);
 258                 }
 259                 s->ball.move_y = get_move_y( s, 2);
 260                 s->player1.responsible = !(s->player2.responsible = 1);
 261                 s->ball.jump += 1.0-2.0*(s->player2.state<5);
 262                 s->play_sound = SOUND_RACKET;
 263                 pan_sample(SOUND_RACKET, 0.6);
 264             }
 265         }
 266     } else {
 267         s->history_is_locked = false;
 268     }
 269
 270     SDL_PollEvent( &e);
 271     keys = SDL_GetKeyState( NULL);
 272     switch(e.type) {
 273         case SDL_JOYAXISMOTION:
 274             if (e.jaxis.axis == JOYSTICK_Y_AXIS) {
 275                 s->joystick_y = JOYSTICK_PERCENTIZE(e.jaxis.value);
 276             } else if (e.jaxis.axis == JOYSTICK_X_AXIS) {
 277                 s->joystick_x = JOYSTICK_PERCENTIZE(e.jaxis.value);
 278             }
 279             break;
 280         case SDL_JOYBUTTONUP: case SDL_JOYBUTTONDOWN:
 281             if (e.jbutton.button == JOYSTICK_BUTTON_A) {
 282                 s->joystick_a = (e.jbutton.state == SDL_PRESSED);
 283             }
 284             break;
 285     }
 286
 287     if( s->time%50==0) {
 288         /**
 289          * Maemo keys:
 290          * F7 = "Decrease" key
 291          * F8 = "Increase" key
 292          **/
 293         if (keys['c'] || keys[SDLK_F8]) {
 294             s->court_type++;
 295         } else if (keys[SDLK_F7]) {
 296             s->court_type--;
 297         }
 298         if (keys['r']) {
 299             if (s->rain == 0) {
 300                 play_sample_background(SOUND_RAIN);
 301             }
 302             s->rain += 10;
 303         }
 304         if (keys['t']) {
 305             s->fog++;
 306         }
 307         if (keys['1']) {
 308             s->wind++;
 309         }
 310         if (keys['2']) {
 311             s->wind--;
 312         }
 313         if (keys['n']) {
 314             s->night = 1 - s->night;
 315         }
 316         if( s->court_type > GR_CTT_LAST) {
 317             s->court_type = GR_CTT_FIRST;
 318         } else if (s->court_type < GR_CTT_FIRST) {
 319             s->court_type = GR_CTT_LAST;
 320         }
 321     }
 322
 323     if( !is_fading() && !s->is_over) {
 324         if( s->player1.type == PLAYER_TYPE_HUMAN) {
 325            input_human( &s->player1,
 326                    keys['w'] || keys[SDLK_UP] || s->joystick_y < -JOYSTICK_TRESHOLD,
 327                    keys['s'] || keys[SDLK_DOWN] || s->joystick_y > JOYSTICK_TRESHOLD,
 328                    keys['d'] || keys[SDLK_SPACE] || keys[SDLK_LCTRL] || keys[SDLK_RETURN] || s->joystick_a,
 329 #ifdef ENABLE_MOUSE
 330                    true,
 331 #else
 332                    false,
 333 #endif
 334                    s);
 335         } else {
 336             input_ai( &s->player1, &s->ball, &s->player2, s);
 337         }
 338
 339         if( s->player2.type == PLAYER_TYPE_HUMAN) {
 340             input_human( &s->player2, keys['o'], keys['l'], keys['k'], false, s);
 341         } else {
 342             input_ai( &s->player2, &s->ball, &s->player1, s);
 343         }
 344     }
 345
 346     /* Maemo: The "F6" button is the "Fullscreen" button */
 347     if( keys['f'] || keys[SDLK_F6]) SDL_WM_ToggleFullScreen( screen);
 348     if( keys['y']) SDL_SaveBMP( screen, "screenshot.bmp");
 349
 350     /* Maemo: The "F4" button is the "Open menu" button */
 351     if( keys['p'] || keys[SDLK_F4]) {
 352         while( keys['p'] || keys[SDLK_F4]) {
 353             SDL_PollEvent( &e);
 354             keys = SDL_GetKeyState( NULL);
 355             SDL_Delay( 10);
 356         }
 357         while( (keys['p'] || keys[SDLK_F4]) == 0) {
 358             SDL_PollEvent( &e);
 359             keys = SDL_GetKeyState( NULL);
 360             SDL_Delay( 10);
 361         }
 362         while( keys['p'] || keys[SDLK_F4]) {
 363             SDL_PollEvent( &e);
 364             keys = SDL_GetKeyState( NULL);
 365             SDL_Delay( 10);
 366         }
 367         s->was_stopped = true;
 368     }
 369
 370     if( keys[SDLK_ESCAPE] || keys['q']) return true;
 371
 372     limit_value( &s->player1.y, PLAYER_Y_MIN, PLAYER_Y_MAX);
 373     limit_value( &s->player2.y, PLAYER_Y_MIN, PLAYER_Y_MAX);
 374     limit_value( &s->ball.jump, BALL_JUMP_MIN, BALL_JUMP_MAX);
 375
 376     /* Update ball_dest for debugging purposes */
 377     get_move_y(s, 1);
 378     get_move_y(s, 2);
 379
 380     if (s->ball.move_x > 0 && s->wind > 0) {
 381         s->ball.x += fabsf(s->wind)/2;
 382     } else if (s->ball.move_x < 0 && s->wind < 0) {
 383         s->ball.x -= fabsf(s->wind)/2;
 384     }
 385
 386     s->ball.x += s->ball.move_x;
 387     s->ball.y += s->ball.move_y;
 388
 389     if(s->player1.state) s->player1.state--;
 390     if(s->player2.state) s->player2.state--;
 391
 392     return false;
 393 }
 394
 395 void render( GameState* s) {
 396     int i, x, y;
 397 #ifdef EXTENDED_REFEREE
 398     int t=1000;
 399 #endif
 400     if (s->play_sound != SOUND_MAX) {
 401         play_sample(s->play_sound);
 402         s->play_sound = SOUND_MAX;
 403     }
 404     if( s->winner != WINNER_NONE) {
 405         if( !s->is_over) {
 406             start_fade();
 407             s->is_over = true;
 408         }
 409         clear_screen();
 410         store_screen();
 411         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);
 412         sprintf( s->game_score_str, "player %d wins the match with %s", s->winner, format_sets( s));
 413         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);
 414         updatescr();
 415         return;
 416     }
 417     if (s->old_court_type != s->court_type) {
 418         clear_screen();
 419         fill_image(s->court_type, 120, 120, 400, 250);
 420         show_image(GR_COURT, 0, 0, 255);
 421         s->old_court_type = s->court_type;
 422         store_screen();
 423     }
 424 #ifdef EXTENDED_REFEREE
 425     switch (s->referee) {
 426         case REFEREE_NORMAL:
 427             t = 1000;
 428             break;
 429         case REFEREE_OUT:
 430             t = 200;
 431             break;
 432         case REFEREE_PLAYER1:
 433         case REFEREE_PLAYER2:
 434             t = 400;
 435             break;
 436     }
 437     t = (s->time/t)%4;
 438     switch (t) {
 439         case 0:
 440             t=0;
 441             break;
 442         case 1:
 443             t=1;
 444             break;
 445         case 2:
 446             t=0;
 447             break;
 448         case 3:
 449             t=2;
 450             break;
 451     }
 452     show_sprite( GR_REFEREE, s->referee*3+t, 12, 250, 10, 255);
 453 #else
 454     show_sprite( GR_REFEREE, s->referee, 4, 250, 10, 255);
 455 #endif
 456     if (voice_finished_flag == 0) {
 457         show_sprite(GR_TALK, (s->time/150)%2, 2, 280, 45, 255);
 458     }
 459     show_image( GR_SHADOW, s->ball.x-BALL_X_MID, s->ball.y + get_phase( s) - BALL_Y_MID, 255);
 460
 461     show_sprite( GR_RACKET, (!s->player1.state), 4, s->player1.x-RACKET_X_MID, s->player1.y-RACKET_Y_MID, 255);
 462     show_sprite( GR_RACKET, (!s->player2.state)+2, 4, s->player2.x-RACKET_X_MID, s->player2.y-RACKET_Y_MID, 255);
 463
 464     if( s->ball.move_x > 0) {
 465         show_sprite( GR_BALL, (s->time/500)%4, 4, s->ball.x-BALL_X_MID, s->ball.y-BALL_Y_MID, 255);
 466     } else if( s->ball.move_x < 0) {
 467         show_sprite( GR_BALL, 3-(s->time/500)%4, 4, s->ball.x-BALL_X_MID, s->ball.y-BALL_Y_MID, 255);
 468     } else {
 469         show_sprite( GR_BALL, 0, 4, s->ball.x-BALL_X_MID, s->ball.y-BALL_Y_MID, 255);
 470     }
 471
 472     /* Player 1's mouse rectangle */
 473     if (!(s->player1.mouse_locked)) {
 474         rectangle(s->player1.x-2+5, s->player1.mouse_y-2, 4, 4, 255, 255, 255);
 475         rectangle(s->player1.x-1+5, s->player1.mouse_y-1, 2, 2, 0, 0, 0);
 476     }
 477
 478     font_draw_string( GR_DKC2_FONT, s->game_score_str, 14, 14, 0, ANIMATION_NONE);
 479     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);
 480
 481     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);
 482
 483     for (i=0; i<s->rain; i++) {
 484         x = rand()%WIDTH;
 485         y = rand()%HEIGHT;
 486         draw_line_faded(x, y, x+10+s->wind*5, y+30, 0, 0, 255, 100, 200, 255);
 487     }
 488     if (s->rain) {
 489         /**
 490          * Cheap-ish update of the whole screen. This can
 491          * probably be optimized.
 492          **/
 493         update_rect(0, 0, WIDTH, HEIGHT);
 494     }
 495
 496 #ifdef DEBUG
 497     line_horiz( s->player1.y, 255, 0, 0);
 498     line_horiz( s->player2.y, 0, 0, 255);
 499     line_horiz( s->ball.y, 0, 255, 0);
 500
 501     line_vert( s->player1.x, 255, 0, 0);
 502     line_vert( s->player2.x, 0, 0, 255);
 503     line_vert( s->ball.x, 0, 255, 0);
 504
 505     line_horiz( s->player1.ball_dest, 255, 0, 255);
 506     line_horiz( s->player2.ball_dest, 0, 255, 255);
 507
 508     line_horiz( GAME_Y_MIN, 100, 100, 100);
 509     line_horiz( GAME_Y_MAX, 100, 100, 100);
 510 #endif
 511     switch (s->fog) {
 512         default:
 513         case 4:
 514             fill_image_offset(GR_FOG2, 0, 0, WIDTH, HEIGHT, -s->time/150-s->windtime/200, 0);
 515         case 3:
 516             fill_image_offset(GR_FOG, 0, 0, WIDTH, HEIGHT, -s->time/100-s->windtime/150, 20);
 517         case 2:
 518             fill_image_offset(GR_FOG2, 0, 0, WIDTH, HEIGHT, -s->time/180-s->windtime/180, 80);
 519         case 1:
 520             fill_image_offset(GR_FOG, 0, 0, WIDTH, HEIGHT, s->time/200-s->windtime/100, 0);
 521         case 0:
 522             break;
 523     }
 524     if (s->night) {
 525         show_image(GR_NIGHT, 0, 0, 255);
 526     }
 527
 528     updatescr();
 529 }
 530
 531 void limit_value( float* value, float min, float max) {
 532     if( *value < min) {
 533         *value = min;
 534     } else if( *value > max) {
 535         *value = max;
 536     }
 537 }
 538
 539 float get_phase( GameState* s) {
 540     float pos, fract;
 541     float x, min, max, direction;
 542
 543     x = s->ball.x;
 544     min = GAME_X_MIN;
 545     max = GAME_X_MAX;
 546     direction = s->ball.move_x;
 547
 548     pos = (direction>0)?(1-GROUND_PHASE):(GROUND_PHASE);
 549
 550     fract = (x-min)/(max-min);
 551
 552     if( fract < pos) {
 553         fract = fract/pos;
 554         return fabsf( cosf(PI*fract/2))*PHASE_AMP*s->ball.jump;
 555     } else {
 556         fract = (pos-fract)/(1-pos);
 557         return fabsf( sinf(PI*fract/2))*PHASE_AMP*s->ball.jump;
 558     }
 559 }
 560
 561 float get_move_y( GameState* s, unsigned char player) {
 562     float pct, dest, x_len, y_len;
 563     float py, by, pa, move_x;
 564
 565     py = (player==1)?(s->player1.y):(s->player2.y);
 566     by = s->ball.y;
 567     pa = RACKET_Y_MID*2;
 568     move_x = s->ball.move_x;
 569
 570     /* -1.0 .. 1.0 for racket hit position */
 571     pct = (by-py)/(pa/2);
 572     limit_value( &pct, -1.0, 1.0);
 573
 574     /* Y destination for ball */
 575     dest = GAME_Y_MID + pct*(GAME_Y_MAX-GAME_Y_MIN);
 576     if( player == 1) {
 577         s->player1.ball_dest = dest;
 578     } else {
 579         s->player2.ball_dest = dest;
 580     }
 581
 582     /* lengths for the ball's journey */
 583     if( player == 1) {
 584         x_len = fabsf(GAME_X_MAX - s->ball.x);
 585         y_len = dest - by + MOVE_Y_SEED-rand()%MOVE_Y_SEED*2;
 586     } else {
 587         x_len = s->ball.x - GAME_X_MIN;
 588         y_len = by - dest + MOVE_Y_SEED-rand()%MOVE_Y_SEED*2;
 589     }
 590
 591     /* return the should-be value for move_y */
 592     return (y_len*move_x)/(x_len);
 593 }
 594
 595 void input_human( Player* player, bool up, bool down, bool hit, bool use_mouse, GameState* s) {
 596     int diff = PLAYER_MOVE_Y;
 597     int mb;
 598
 599     /**
 600      * Only use mouse control if the user isn't pressing any buttons
 601      * this way, keyboard control still works when mouse control is
 602      * enabled.
 603      **/
 604     if (use_mouse && (down || up || hit)) {
 605         /**
 606          * this is here so if the user decides to play
 607          * with keyboard controls, we will lock the
 608          * mouse and disable displaying the mouse cursor
 609          **/
 610         player->mouse_locked = true;
 611     }
 612     if (use_mouse && !down && !up && !hit) {
 613         mb = SDL_GetMouseState(&(player->mouse_x), &(player->mouse_y));
 614         if (mb&SDL_BUTTON(SDL_BUTTON_LEFT)) {
 615             if (player->mouse_y < player->y) {
 616                 down = false;
 617                 up = true;
 618                 diff = (player->y-player->mouse_y<diff)?(player->y-player->mouse_y):(diff);
 619             } else if (player->mouse_y > player->y) {
 620                 up = false;
 621                 down = true;
 622                 diff = (player->mouse_y-player->y<diff)?(player->mouse_y-player->y):(diff);
 623             }
 624             player->mouse_locked = false;
 625         } else if (!player->mouse_locked) {
 626             hit = true;
 627         }
 628     }
 629
 630     if (fabsf(s->joystick_y) > JOYSTICK_TRESHOLD) {
 631         diff = PLAYER_MOVE_Y*fabsf(s->joystick_y)/40.0;
 632         if (diff > PLAYER_MOVE_Y) {
 633             diff = PLAYER_MOVE_Y;
 634         }
 635     }
 636
 637     if (up) {
 638         player->y -= fminf(diff, diff*player->accelerate);
 639         player->accelerate *= PLAYER_ACCEL_INCREASE;
 640     } else if (down) {
 641         player->y += fminf(diff, diff*player->accelerate);
 642         player->accelerate *= PLAYER_ACCEL_INCREASE;
 643     } else {
 644         player->accelerate = PLAYER_ACCEL_DEFAULT;
 645     }
 646
 647     if( hit) {
 648         if( !player->state && !player->state_locked) {
 649             player->state = PLAYER_STATE_MAX;
 650             player->state_locked = true;
 651         }
 652     } else {
 653         player->state_locked = false;
 654     }
 655 }
 656
 657 void input_ai( Player* player, Ball* ball, Player* opponent, GameState* s) {
 658     float fact = 1.7;
 659     float target;
 660
 661     if( fabsf( player->y - ball->y) > RACKET_Y_MID*5) {
 662         fact = 3.5;
 663     }
 664
 665     target = GAME_Y_MID + (opponent->ball_dest - GAME_Y_MID)/5;
 666
 667     if( player->responsible) {
 668         if( player->desire == DESIRE_NORMAL && !IS_NEAR_Y_AI( player->y, ball->y)) {
 669             if( player->y < ball->y) {
 670                 player->y += fmin( 2*fact, ball->y - player->y);
 671             } else if( player->y > ball->y) {
 672                 player->y -= fmin( 2*fact, player->y - ball->y);
 673             }
 674         }
 675
 676         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) {
 677             player->state = PLAYER_STATE_MAX;
 678         }
 679     } else if( ball->move_x == 0) {
 680         if( player->desire == DESIRE_NORMAL && !IS_NEAR_Y_AI( player->y, target)) {
 681             if( player->y < target) {
 682                 player->y += fmin( fact, (target-player->y)/40.0);
 683             } else if( player->y > target) {
 684                 player->y -= fmin( fact, (player->y-target)/40.0);
 685             }
 686         }
 687     } else if( s->ngram_prediction > 0.0) {
 688         target = s->ngram_prediction*((float)HEIGHT)/((float)(NGRAM_STEPS));
 689         target = GAME_Y_MID + (target-GAME_Y_MID)*1.5;
 690
 691         if( player->desire == DESIRE_NORMAL && !IS_NEAR_Y_AI( player->y, target)) {
 692             if( player->y < target) {
 693                 player->y += fmin( fact, (target-player->y)/40.0);
 694             } else if( player->y > target) {
 695                 player->y -= fmin( fact, (player->y-target)/40.0);
 696             }
 697         }
 698     } else {/*
 699         if( player->desire == DESIRE_NORMAL) {
 700             if( !IS_NEAR_Y_AI( player->y, target)) {
 701                 player->y += (target - player->y)/40.0;
 702             }
 703         }*/
 704     }
 705 }
 706
 707 void game_setup_serve( GameState* s) {
 708     s->ball.jump = 7.5;
 709     s->ball.y = GAME_Y_MID;
 710     s->ball.move_x = 0.0;
 711     s->ball.move_y = 0.0;
 712
 713     if( s->player1_serves) {
 714         s->player1.responsible = true;
 715         s->player1.ball_dest = 0.0;
 716         s->ball.x = GAME_X_MIN-RACKET_X_MID*1.5;
 717     } else {
 718         s->player1.responsible = false;
 719         s->player2.ball_dest = 0.0;
 720         s->ball.x = GAME_X_MAX+RACKET_X_MID*1.5;
 721     }
 722
 723     s->player2.responsible = !(s->player1.responsible);
 724 }
 725
 726 float ngram_predictor( GameState* s) {
 727     unsigned int count = 0;
 728     unsigned long sum = 0;
 729     int x, y, z;
 730     float result;
 731
 732     if( s->history_size < 3) {
 733         return 0.0;
 734     }
 735
 736     x = s->history[1];
 737     y = s->history[2];
 738
 739     for( z = 0; z<NGRAM_STEPS; z++) {
 740         count += s->ngram[x][y][z];
 741         sum += z * s->ngram[x][y][z];
 742     }
 743
 744     result = ((float)(sum))/((float)(count));
 745 #ifdef DEBUG
 746     printf( "predicting next = %.2f\n", result);
 747 #endif
 748
 749     return result;
 750 }
 751
 752 void score_game( GameState* s, bool player1_scored) {
 753     Player* winner = (player1_scored)?(&(s->player1)):(&(s->player2));
 754     Player* loser = (player1_scored)?(&(s->player2)):(&(s->player1));
 755
 756     if( s->current_set >= SETS_TO_WIN*2-1) {
 757         return;
 758     }
 759
 760     winner->game++;
 761     if( loser->game < winner->game-1) {
 762         if( winner->game >= 4) {
 763             winner->game = loser->game = 0;
 764             winner->sets[s->current_set]++;
 765
 766 #ifdef HAVE_VOICE_FILES
 767             /* speak the current score */
 768             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);
 769 #endif
 770
 771             /* scoring the set.. */
 772             if( (winner->sets[s->current_set] == 6 && loser->sets[s->current_set] < 5) ||
 773                 winner->sets[s->current_set] == 7) {
 774                 s->current_set++;
 775                 s->winner = game_get_winner( s);
 776             }
 777         }
 778     }
 779 }
 780
 781 char* format_sets( GameState* s) {
 782     static char sets[100];
 783     static char tmp[100];
 784     int i, max = s->current_set;
 785
 786     sets[0] = '\0';
 787
 788     if( s->winner != WINNER_NONE) {
 789         max--;
 790     }
 791     for( i=0; i<=max; i++) {
 792         sprintf( tmp, "%d:%d, ", s->player1.sets[i], s->player2.sets[i]);
 793         strcat( sets, tmp);
 794     }
 795
 796     sets[strlen(sets)-2] = '\0';
 797
 798     return sets;
 799 }
 800
 801 char* format_game( GameState* s) {
 802     static char game[100];
 803     static const int game_scoring[] = { 0, 15, 30, 40 };
 804
 805     if( s->player1.game < 4 && s->player2.game < 4) {
 806 #ifdef HAVE_VOICE_FILES
 807         if (s->player1.game > 0 || s->player2.game > 0) {
 808             if (s->player1.game == s->player2.game) {
 809                 voice_say_list(2, VOICE_LOVE_IN + 2*(s->player1.game), VOICE_ALL);
 810             } else {
 811                 voice_say_list(2, VOICE_LOVE_IN + 2*(s->player1.game), VOICE_LOVE_OUT + 2*(s->player2.game));
 812             }
 813         }
 814 #endif
 815         sprintf( game, "%d - %d", game_scoring[s->player1.game], game_scoring[s->player2.game]);
 816     } else if( s->player1.game > s->player2.game) {
 817 #ifdef HAVE_VOICE_FILES
 818         voice_say_list(1, VOICE_ADVANTAGE_PLAYER_ONE);
 819 #endif
 820         strcpy( game, "advantage player 1");
 821     } else if( s->player1.game < s->player2.game) {
 822 #ifdef HAVE_VOICE_FILES
 823         voice_say_list(1, VOICE_ADVANTAGE_PLAYER_TWO);
 824 #endif
 825         strcpy( game, "advantage player 2");
 826     } else {
 827 #ifdef HAVE_VOICE_FILES
 828         voice_say_list(1, VOICE_DEUCE);
 829 #endif
 830         strcpy( game, "deuce");
 831     }
 832
 833     return game;
 834 }
 835
 836 char* format_status( GameState* s) {
 837     static char status[100];
 838     static const char* set_names[] = { "first", "second", "third", "fourth", "fifth" };
 839
 840     sprintf( status, "%d:%d in %s set", s->player1.sets[s->current_set], s->player2.sets[s->current_set], set_names[s->current_set]);
 841
 842     return status;
 843 }
 844
 845 int game_get_winner( GameState* s) {
 846     int i;
 847     int sets[2] = {0};
 848
 849     for( i=0; i<s->current_set; i++) {
 850         if( s->player1.sets[i] > s->player2.sets[i]) {
 851             sets[0]++;
 852         } else {
 853             sets[1]++;
 854         }
 855     }
 856
 857     if( sets[0] == SETS_TO_WIN) return WINNER_PLAYER1;
 858     if( sets[1] == SETS_TO_WIN) return WINNER_PLAYER2;
 859
 860     return WINNER_NONE;
 861 }
 862