src/engine/e_input_sdl2.inc

   1 interface
   2
   3 uses
   4   SDL2, SysUtils;
   5
   6 const
   7   e_MaxKbdKeys  = SDL_NUM_SCANCODES;
   8   e_MaxJoys     = 4;
   9   e_MaxJoyBtns  = 32;
  10   e_MaxJoyAxes  = 8;
  11   e_MaxJoyHats  = 8;
  12   e_MaxVirtKeys = 48;
  13
  14   e_MaxJoyKeys = e_MaxJoyBtns + e_MaxJoyAxes*2 + e_MaxJoyHats*4;
  15
  16   e_MaxInputKeys = e_MaxKbdKeys + e_MaxJoys*e_MaxJoyKeys + e_MaxVirtKeys - 1;
  17   // $$$..$$$ -  321 Keyboard buttons/keys
  18   // $$$..$$$ - 4*32 Joystick buttons
  19   // $$$..$$$ -  8*2 Joystick axes (- and +)
  20   // $$$..$$$ -  4*4 Joystick hats (L U R D)
  21   // $$$..$$$ -   48 Virtual buttons/keys
  22
  23   KBRD_END = e_MaxKbdKeys;
  24   JOYK_BEG = KBRD_END;
  25   JOYK_END = JOYK_BEG + e_MaxJoyBtns*e_MaxJoys;
  26   JOYA_BEG = JOYK_END;
  27   JOYA_END = JOYA_BEG + e_MaxJoyAxes*2*e_MaxJoys;
  28   JOYH_BEG = JOYA_END;
  29   JOYH_END = JOYH_BEG + e_MaxJoyHats*4*e_MaxJoys;
  30   VIRT_BEG = JOYH_END;
  31   VIRT_END = VIRT_BEG + e_MaxVirtKeys;
  32
  33   // these are apparently used in g_gui and g_game and elsewhere
  34   IK_INVALID = 0;
  35   IK_ESCAPE  = SDL_SCANCODE_ESCAPE;
  36   IK_RETURN  = SDL_SCANCODE_RETURN;
  37   IK_KPRETURN= SDL_SCANCODE_KP_ENTER;
  38   IK_ENTER   = SDL_SCANCODE_RETURN;
  39   IK_KPINSERT = SDL_SCANCODE_KP_0;
  40   IK_UP      = SDL_SCANCODE_UP;
  41   IK_KPUP    = SDL_SCANCODE_KP_8;
  42   IK_DOWN    = SDL_SCANCODE_DOWN;
  43   IK_KPDOWN  = SDL_SCANCODE_KP_2;
  44   IK_LEFT    = SDL_SCANCODE_LEFT;
  45   IK_KPLEFT  = SDL_SCANCODE_KP_4;
  46   IK_RIGHT   = SDL_SCANCODE_RIGHT;
  47   IK_KPRIGHT = SDL_SCANCODE_KP_6;
  48   IK_DELETE  = SDL_SCANCODE_DELETE;
  49   IK_HOME    = SDL_SCANCODE_HOME;
  50   IK_KPHOME  = SDL_SCANCODE_KP_7;
  51   IK_INSERT  = SDL_SCANCODE_INSERT;
  52   IK_SPACE   = SDL_SCANCODE_SPACE;
  53   IK_CONTROL = SDL_SCANCODE_LCTRL;
  54   IK_SHIFT   = SDL_SCANCODE_LSHIFT;
  55   IK_ALT     = SDL_SCANCODE_LALT;
  56   IK_TAB     = SDL_SCANCODE_TAB;
  57   IK_PAGEUP  = SDL_SCANCODE_PAGEUP;
  58   IK_KPPAGEUP= SDL_SCANCODE_KP_9;
  59   IK_PAGEDN  = SDL_SCANCODE_PAGEDOWN;
  60   IK_KPPAGEDN= SDL_SCANCODE_KP_3;
  61   IK_KP5     = SDL_SCANCODE_KP_5;
  62   IK_NUMLOCK = SDL_SCANCODE_NUMLOCKCLEAR;
  63   IK_KPDIVIDE= SDL_SCANCODE_KP_DIVIDE;
  64   IK_KPMULTIPLE= SDL_SCANCODE_KP_MULTIPLY;
  65   IK_KPMINUS = SDL_SCANCODE_KP_MINUS;
  66   IK_KPPLUS  = SDL_SCANCODE_KP_PLUS;
  67   IK_KPENTER = SDL_SCANCODE_KP_ENTER;
  68   IK_KPDOT   = SDL_SCANCODE_KP_PERIOD;
  69   IK_CAPSLOCK= SDL_SCANCODE_CAPSLOCK;
  70   IK_RSHIFT  = SDL_SCANCODE_RSHIFT;
  71   IK_CTRL    = SDL_SCANCODE_LCTRL;
  72   IK_RCTRL   = SDL_SCANCODE_RCTRL;
  73   IK_RALT    = SDL_SCANCODE_RALT;
  74   IK_WIN     = SDL_SCANCODE_LGUI;
  75   IK_RWIN    = SDL_SCANCODE_RGUI;
  76   IK_MENU    = SDL_SCANCODE_MENU;
  77   IK_PRINTSCR= SDL_SCANCODE_PRINTSCREEN;
  78   IK_SCROLLLOCK= SDL_SCANCODE_SCROLLLOCK;
  79   IK_LBRACKET= SDL_SCANCODE_LEFTBRACKET;
  80   IK_RBRACKET= SDL_SCANCODE_RIGHTBRACKET;
  81   IK_SEMICOLON= SDL_SCANCODE_SEMICOLON;
  82   IK_QUOTE   = SDL_SCANCODE_APOSTROPHE;
  83   IK_BACKSLASH= SDL_SCANCODE_BACKSLASH;
  84   IK_SLASH   = SDL_SCANCODE_SLASH;
  85   IK_COMMA   = SDL_SCANCODE_COMMA;
  86   IK_DOT     = SDL_SCANCODE_PERIOD;
  87   IK_EQUALS  = SDL_SCANCODE_EQUALS;
  88   IK_0      = SDL_SCANCODE_0;
  89   IK_1      = SDL_SCANCODE_1;
  90   IK_2      = SDL_SCANCODE_2;
  91   IK_3      = SDL_SCANCODE_3;
  92   IK_4      = SDL_SCANCODE_4;
  93   IK_5      = SDL_SCANCODE_5;
  94   IK_6      = SDL_SCANCODE_6;
  95   IK_7      = SDL_SCANCODE_7;
  96   IK_8      = SDL_SCANCODE_8;
  97   IK_9      = SDL_SCANCODE_9;
  98   IK_F1      = SDL_SCANCODE_F1;
  99   IK_F2      = SDL_SCANCODE_F2;
 100   IK_F3      = SDL_SCANCODE_F3;
 101   IK_F4      = SDL_SCANCODE_F4;
 102   IK_F5      = SDL_SCANCODE_F5;
 103   IK_F6      = SDL_SCANCODE_F6;
 104   IK_F7      = SDL_SCANCODE_F7;
 105   IK_F8      = SDL_SCANCODE_F8;
 106   IK_F9      = SDL_SCANCODE_F9;
 107   IK_F10     = SDL_SCANCODE_F10;
 108   IK_F11     = SDL_SCANCODE_F11;
 109   IK_F12     = SDL_SCANCODE_F12;
 110   IK_END     = SDL_SCANCODE_END;
 111   IK_KPEND   = SDL_SCANCODE_KP_1;
 112   IK_BACKSPACE = SDL_SCANCODE_BACKSPACE;
 113   IK_BACKQUOTE = SDL_SCANCODE_GRAVE;
 114   IK_GRAVE     = SDL_SCANCODE_GRAVE;
 115   IK_PAUSE   = SDL_SCANCODE_PAUSE;
 116   IK_Y       = SDL_SCANCODE_Y;
 117   IK_N       = SDL_SCANCODE_N;
 118   IK_W       = SDL_SCANCODE_W;
 119   IK_A       = SDL_SCANCODE_A;
 120   IK_S       = SDL_SCANCODE_S;
 121   IK_D       = SDL_SCANCODE_D;
 122   IK_Q       = SDL_SCANCODE_Q;
 123   IK_E       = SDL_SCANCODE_E;
 124   IK_H       = SDL_SCANCODE_H;
 125   IK_J       = SDL_SCANCODE_J;
 126   IK_T       = SDL_SCANCODE_T;
 127   IK_Z       = SDL_SCANCODE_Z;
 128   IK_MINUS   = SDL_SCANCODE_MINUS;
 129   // TODO: think of something better than this shit
 130   IK_LASTKEY = SDL_NUM_SCANCODES-1;
 131
 132   VK_FIRSTKEY = e_MaxKbdKeys + e_MaxJoys*e_MaxJoyKeys;
 133   VK_LEFT     = VK_FIRSTKEY + 0;
 134   VK_RIGHT    = VK_FIRSTKEY + 1;
 135   VK_UP       = VK_FIRSTKEY + 2;
 136   VK_DOWN     = VK_FIRSTKEY + 3;
 137   VK_FIRE     = VK_FIRSTKEY + 4;
 138   VK_OPEN     = VK_FIRSTKEY + 5;
 139   VK_JUMP     = VK_FIRSTKEY + 6;
 140   VK_CHAT     = VK_FIRSTKEY + 7;
 141   VK_ESCAPE   = VK_FIRSTKEY + 8;
 142   VK_0        = VK_FIRSTKEY + 9;
 143   VK_1        = VK_FIRSTKEY + 10;
 144   VK_2        = VK_FIRSTKEY + 11;
 145   VK_3        = VK_FIRSTKEY + 12;
 146   VK_4        = VK_FIRSTKEY + 13;
 147   VK_5        = VK_FIRSTKEY + 14;
 148   VK_6        = VK_FIRSTKEY + 15;
 149   VK_7        = VK_FIRSTKEY + 16;
 150   VK_8        = VK_FIRSTKEY + 17;
 151   VK_9        = VK_FIRSTKEY + 18;
 152   VK_A        = VK_FIRSTKEY + 19;
 153   VK_B        = VK_FIRSTKEY + 20;
 154   VK_C        = VK_FIRSTKEY + 21;
 155   VK_D        = VK_FIRSTKEY + 22;
 156   VK_E        = VK_FIRSTKEY + 23;
 157   VK_F        = VK_FIRSTKEY + 24;
 158   VK_CONSOLE  = VK_FIRSTKEY + 25;
 159   VK_STATUS   = VK_FIRSTKEY + 26;
 160   VK_TEAM     = VK_FIRSTKEY + 27;
 161   VK_PREV     = VK_FIRSTKEY + 28;
 162   VK_NEXT     = VK_FIRSTKEY + 29;
 163   VK_STRAFE   = VK_FIRSTKEY + 30;
 164   VK_LSTRAFE  = VK_FIRSTKEY + 31;
 165   VK_RSTRAFE  = VK_FIRSTKEY + 32;
 166   VK_PRINTSCR = VK_FIRSTKEY + 33;
 167   VK_SHOWKBD  = VK_FIRSTKEY + 34;
 168   VK_HIDEKBD  = VK_FIRSTKEY + 35;
 169   VK_LASTKEY  = e_MaxKbdKeys + e_MaxJoys*e_MaxJoyKeys + e_MaxVirtKeys - 1;
 170
 171   AX_MINUS  = 0;
 172   AX_PLUS   = 1;
 173   HAT_LEFT  = 0;
 174   HAT_UP    = 1;
 175   HAT_RIGHT = 2;
 176   HAT_DOWN  = 3;
 177
 178   JOY0_ATTACK = JOYK_BEG + 0*e_MaxJoyBtns + 0;
 179   JOY1_ATTACK = JOYK_BEG + 1*e_MaxJoyBtns + 0;
 180   JOY2_ATTACK = JOYK_BEG + 2*e_MaxJoyBtns + 0;
 181   JOY3_ATTACK = JOYK_BEG + 3*e_MaxJoyBtns + 0;
 182   JOY0_NEXT = JOYK_BEG + 0*e_MaxJoyBtns + 1;
 183   JOY1_NEXT = JOYK_BEG + 1*e_MaxJoyBtns + 1;
 184   JOY2_NEXT = JOYK_BEG + 2*e_MaxJoyBtns + 1;
 185   JOY3_NEXT = JOYK_BEG + 3*e_MaxJoyBtns + 1;
 186   JOY0_JUMP = JOYK_BEG + 0*e_MaxJoyBtns + 2;
 187   JOY1_JUMP = JOYK_BEG + 1*e_MaxJoyBtns + 2;
 188   JOY2_JUMP = JOYK_BEG + 2*e_MaxJoyBtns + 2;
 189   JOY3_JUMP = JOYK_BEG + 3*e_MaxJoyBtns + 2;
 190   JOY0_ACTIVATE = JOYK_BEG + 0*e_MaxJoyBtns + 3;
 191   JOY1_ACTIVATE = JOYK_BEG + 1*e_MaxJoyBtns + 3;
 192   JOY2_ACTIVATE = JOYK_BEG + 2*e_MaxJoyBtns + 3;
 193   JOY3_ACTIVATE = JOYK_BEG + 3*e_MaxJoyBtns + 3;
 194   JOY0_PREV = JOYK_BEG + 0*e_MaxJoyBtns + 4;
 195   JOY1_PREV = JOYK_BEG + 1*e_MaxJoyBtns + 4;
 196   JOY2_PREV = JOYK_BEG + 2*e_MaxJoyBtns + 4;
 197   JOY3_PREV = JOYK_BEG + 3*e_MaxJoyBtns + 4;
 198
 199   JOY0_LEFT = JOYH_BEG + 0*e_MaxJoyHats*4 + 0*4 + HAT_LEFT;
 200   JOY1_LEFT = JOYH_BEG + 1*e_MaxJoyHats*4 + 0*4 + HAT_LEFT;
 201   JOY2_LEFT = JOYH_BEG + 2*e_MaxJoyHats*4 + 0*4 + HAT_LEFT;
 202   JOY3_LEFT = JOYH_BEG + 3*e_MaxJoyHats*4 + 0*4 + HAT_LEFT;
 203   JOY0_RIGHT = JOYH_BEG + 0*e_MaxJoyHats*4 + 0*4 + HAT_RIGHT;
 204   JOY1_RIGHT = JOYH_BEG + 1*e_MaxJoyHats*4 + 0*4 + HAT_RIGHT;
 205   JOY2_RIGHT = JOYH_BEG + 2*e_MaxJoyHats*4 + 0*4 + HAT_RIGHT;
 206   JOY3_RIGHT = JOYH_BEG + 3*e_MaxJoyHats*4 + 0*4 + HAT_RIGHT;
 207   JOY0_UP = JOYH_BEG + 0*e_MaxJoyHats*4 + 0*4 + HAT_UP;
 208   JOY1_UP = JOYH_BEG + 1*e_MaxJoyHats*4 + 0*4 + HAT_UP;
 209   JOY2_UP = JOYH_BEG + 2*e_MaxJoyHats*4 + 0*4 + HAT_UP;
 210   JOY3_UP = JOYH_BEG + 3*e_MaxJoyHats*4 + 0*4 + HAT_UP;
 211   JOY0_DOWN = JOYH_BEG + 0*e_MaxJoyHats*4 + 0*4 + HAT_DOWN;
 212   JOY1_DOWN = JOYH_BEG + 1*e_MaxJoyHats*4 + 0*4 + HAT_DOWN;
 213   JOY2_DOWN = JOYH_BEG + 2*e_MaxJoyHats*4 + 0*4 + HAT_DOWN;
 214   JOY3_DOWN = JOYH_BEG + 3*e_MaxJoyHats*4 + 0*4 + HAT_DOWN;
 215
 216 function  e_InitInput: Boolean;
 217 procedure e_ReleaseInput;
 218 procedure e_UnpressAllKeys;
 219 procedure e_KeyUpDown (key: Integer; down: Boolean);
 220
 221 function  e_KeyPressed (key: Integer): Boolean;
 222 function  e_AnyKeyPressed: Boolean;
 223 function  e_GetFirstKeyPressed: Integer;
 224 function  e_HasJoysticks: Boolean;
 225
 226 function  e_JoyButtonToKey (id, btn: Integer): Integer;
 227 function  e_JoyAxisToKey (id, ax, dir: Integer): Integer;
 228 function  e_JoyHatToKey (id, hat, dir: Integer): Integer;
 229
 230 var
 231   e_JoystickAvailable: array [0..e_MaxJoys - 1] of Boolean;
 232   e_JoystickDeadzones: array [0..e_MaxJoys - 1] of Integer = (8192, 8192, 8192, 8192);
 233   e_KeyNames: array [0..e_MaxInputKeys] of String;
 234
 235 implementation
 236
 237 var
 238   InputBuffer: array [0..e_MaxInputKeys - 1] of Boolean;
 239
 240 procedure e_UnpressAllKeys;
 241   var i: Integer;
 242 begin
 243   for i := 0 to High(InputBuffer) do
 244     InputBuffer[i] := False
 245 end;
 246
 247 procedure e_KeyUpDown (key: Integer; down: Boolean);
 248 begin
 249   ASSERT(key >= 0);
 250   ASSERT(key < e_MaxInputKeys);
 251   if key > 0 then
 252     InputBuffer[key] := down
 253 end;
 254
 255 procedure GenerateKeyNames;
 256   var i, j, k: Integer;
 257 begin
 258   // keyboard key names
 259   e_KeyNames[IK_0] := '0';
 260   e_KeyNames[IK_1] := '1';
 261   e_KeyNames[IK_2] := '2';
 262   e_KeyNames[IK_3] := '3';
 263   e_KeyNames[IK_4] := '4';
 264   e_KeyNames[IK_5] := '5';
 265   e_KeyNames[IK_6] := '6';
 266   e_KeyNames[IK_7] := '7';
 267   e_KeyNames[IK_8] := '8';
 268   e_KeyNames[IK_9] := '9';
 269
 270   for i := IK_A to IK_Z do
 271     e_KeyNames[i] := '' + chr(ord('a') + (i - IK_a));
 272
 273   e_KeyNames[IK_ESCAPE] := 'ESCAPE';
 274   e_KeyNames[IK_ENTER] := 'ENTER';
 275   e_KeyNames[IK_TAB] := 'TAB';
 276   e_KeyNames[IK_BACKSPACE] := 'BACKSPACE';
 277   e_KeyNames[IK_SPACE] := 'SPACE';
 278   e_KeyNames[IK_UP] := 'UP';
 279   e_KeyNames[IK_LEFT] := 'LEFT';
 280   e_KeyNames[IK_RIGHT] := 'RIGHT';
 281   e_KeyNames[IK_DOWN] := 'DOWN';
 282   e_KeyNames[IK_INSERT] := 'INSERT';
 283   e_KeyNames[IK_DELETE] := 'DELETE';
 284   e_KeyNames[IK_HOME] := 'HOME';
 285   e_KeyNames[IK_END] := 'END';
 286   e_KeyNames[IK_PAGEUP] := 'PGUP';
 287   e_KeyNames[IK_PAGEDN] := 'PGDOWN';
 288   e_KeyNames[IK_KPINSERT] := 'PAD0';
 289   e_KeyNames[IK_KPEND] := 'PAD1';
 290   e_KeyNames[IK_KPDOWN] := 'PAD2';
 291   e_KeyNames[IK_KPPAGEDN] := 'PAD3';
 292   e_KeyNames[IK_KPLEFT] := 'PAD4';
 293   e_KeyNames[IK_KP5] := 'PAD5';
 294   e_KeyNames[IK_KPRIGHT] := 'PAD6';
 295   e_KeyNames[IK_KPHOME] := 'PAD7';
 296   e_KeyNames[IK_KPUP] := 'PAD8';
 297   e_KeyNames[IK_KPPAGEUP] := 'PAD9';
 298   e_KeyNames[IK_NUMLOCK] := 'NUM';
 299   e_KeyNames[IK_KPDIVIDE] := 'PAD/';
 300   e_KeyNames[IK_KPMULTIPLE] := 'PAD*';
 301   e_KeyNames[IK_KPMINUS] := 'PAD-';
 302   e_KeyNames[IK_KPPLUS] := 'PAD+';
 303   e_KeyNames[IK_KPENTER] := 'PADENTER';
 304   e_KeyNames[IK_KPDOT] := 'PAD.';
 305   e_KeyNames[IK_CAPSLOCK] := 'CAPS';
 306   e_KeyNames[IK_BACKQUOTE] := 'BACKQUOTE';
 307   e_KeyNames[IK_F1] := 'F1';
 308   e_KeyNames[IK_F2] := 'F2';
 309   e_KeyNames[IK_F3] := 'F3';
 310   e_KeyNames[IK_F4] := 'F4';
 311   e_KeyNames[IK_F5] := 'F5';
 312   e_KeyNames[IK_F6] := 'F6';
 313   e_KeyNames[IK_F7] := 'F7';
 314   e_KeyNames[IK_F8] := 'F8';
 315   e_KeyNames[IK_F9] := 'F9';
 316   e_KeyNames[IK_F10] := 'F10';
 317   e_KeyNames[IK_F11] := 'F11';
 318   e_KeyNames[IK_F12] := 'F12';
 319   e_KeyNames[IK_SHIFT] := 'LSHIFT';
 320   e_KeyNames[IK_RSHIFT] := 'RSHIFT';
 321   e_KeyNames[IK_CTRL] := 'LCTRL';
 322   e_KeyNames[IK_RCTRL] := 'RCTRL';
 323   e_KeyNames[IK_ALT] := 'LALT';
 324   e_KeyNames[IK_RALT] := 'RALT';
 325   e_KeyNames[IK_WIN] := 'LWIN';
 326   e_KeyNames[IK_RWIN] := 'RWIN';
 327   e_KeyNames[IK_MENU] := 'MENU';
 328   e_KeyNames[IK_PRINTSCR] := 'PSCRN';
 329   e_KeyNames[IK_SCROLLLOCK] := 'SCROLL';
 330   e_KeyNames[IK_PAUSE] := 'PAUSE';
 331   e_KeyNames[IK_LBRACKET] := '[';
 332   e_KeyNames[IK_RBRACKET] := ']';
 333   e_KeyNames[IK_SEMICOLON] := ';';
 334   e_KeyNames[IK_QUOTE] := '''';
 335   e_KeyNames[IK_BACKSLASH] := '\';
 336   e_KeyNames[IK_SLASH] := '/';
 337   e_KeyNames[IK_COMMA] := ',';
 338   e_KeyNames[IK_DOT] := '.';
 339   e_KeyNames[IK_MINUS] := '-';
 340   e_KeyNames[IK_EQUALS] := '=';
 341
 342   // joysticks
 343   for j := 0 to e_MaxJoys-1 do
 344   begin
 345     k := JOYK_BEG + j * e_MaxJoyBtns;
 346     // buttons
 347     for i := 0 to e_MaxJoyBtns-1 do
 348       e_KeyNames[k + i] := Format('JOY%dB%d', [j, i]);
 349     k := JOYA_BEG + j * e_MaxJoyAxes * 2;
 350     // axes
 351     for i := 0 to e_MaxJoyAxes-1 do
 352     begin
 353       e_KeyNames[k + i*2    ] := Format('JOY%dA%d+', [j, i]);
 354       e_KeyNames[k + i*2 + 1] := Format('JOY%dA%d-', [j, i]);
 355     end;
 356     k := JOYH_BEG + j * e_MaxJoyHats * 4;
 357     // hats
 358     for i := 0 to e_MaxJoyHats-1 do
 359     begin
 360       e_KeyNames[k + i*4    ] := Format('JOY%dD%dL', [j, i]);
 361       e_KeyNames[k + i*4 + 1] := Format('JOY%dD%dU', [j, i]);
 362       e_KeyNames[k + i*4 + 2] := Format('JOY%dD%dR', [j, i]);
 363       e_KeyNames[k + i*4 + 3] := Format('JOY%dD%dD', [j, i]);
 364     end;
 365   end;
 366
 367   // vitrual keys
 368   for i := 0 to e_MaxVirtKeys-1 do
 369     e_KeyNames[VIRT_BEG + i] := 'VIRTUAL' + IntToStr(i);
 370 end;
 371
 372 function e_HasJoysticks: Boolean;
 373   var i: Integer;
 374 begin
 375   i := 0;
 376   while (i < e_MaxJoys) and (e_JoystickAvailable[i] = False) do inc(i);
 377   result := i < e_MaxJoys
 378 end;
 379
 380 function e_InitInput: Boolean;
 381   var i: Integer;
 382 begin
 383   for i := 0 to e_MaxJoys - 1 do
 384     e_JoystickAvailable[i] := False;
 385   GenerateKeyNames;
 386   result := True
 387 end;
 388
 389 procedure e_ReleaseInput;
 390   var i: Integer;
 391 begin
 392   for i := 0 to e_MaxJoys - 1 do
 393     e_JoystickAvailable[i] := False
 394 end;
 395
 396 function e_KeyPressed (key: Integer): Boolean;
 397 begin
 398   ASSERT(key >= 0);
 399   ASSERT(key < e_MaxInputKeys);
 400   result := InputBuffer[key]
 401 end;
 402
 403 function e_AnyKeyPressed: Boolean;
 404 begin
 405   result := e_GetFirstKeyPressed <> IK_INVALID;
 406 end;
 407
 408 function e_GetFirstKeyPressed: Integer;
 409   var i: Integer;
 410 begin
 411   i := 1;
 412   while (i < e_MaxInputKeys) and (InputBuffer[i] = False) do inc(i);
 413   if i < e_MaxInputKeys then
 414     result := i
 415   else
 416     result := IK_INVALID
 417 end;
 418
 419 function e_JoyButtonToKey (id, btn: Integer): Integer;
 420 begin
 421   ASSERT(id >= 0);
 422   ASSERT(id < e_MaxJoys);
 423   ASSERT(btn >= 0);
 424   ASSERT(btn < e_MaxJoyBtns);
 425   result := JOYK_BEG + id*e_MaxJoyBtns + btn
 426 end;
 427
 428 function e_JoyAxisToKey (id, ax, dir: Integer): Integer;
 429 begin
 430   ASSERT(id >= 0);
 431   ASSERT(id < e_MaxJoys);
 432   ASSERT(ax >= 0);
 433   ASSERT(ax < e_MaxJoyAxes);
 434   ASSERT(dir in [AX_MINUS, AX_PLUS]);
 435   result := JOYA_BEG + id*e_MaxJoyAxes*2 + ax*2 + dir
 436 end;
 437
 438 function e_JoyHatToKey (id, hat, dir: Integer): Integer;
 439 begin
 440   ASSERT(id >= 0);
 441   ASSERT(id < e_MaxJoys);
 442   ASSERT(hat >= 0);
 443   ASSERT(hat < e_MaxJoyHats);
 444   ASSERT(dir in [HAT_LEFT, HAT_UP, HAT_RIGHT, HAT_DOWN]);
 445   result := JOYH_BEG + id*e_MaxJoyHats*4 + hat*4 + dir
 446 end;