src/game/sdl2/g_system.pas

   1 (* Copyright (C)  Doom 2D: Forever Developers
   2  *
   3  * This program is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, version 3 of the License ONLY.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  14  *)
  15 {$INCLUDE ../shared/a_modes.inc}
  16 unit g_system;
  17
  18 interface
  19
  20   uses Utils;
  21
  22   (* --- Utils --- *)
  23   function sys_GetTicks (): Int64;
  24   procedure sys_Delay (ms: Integer);
  25
  26   (* --- Graphics --- *)
  27   function sys_GetDisplayModes (bpp: Integer): SSArray;
  28   function sys_SetDisplayMode (w, h, bpp: Integer; fullscreen, maximized: Boolean): Boolean;
  29   procedure sys_EnableVSync (yes: Boolean);
  30   procedure sys_Repaint;
  31
  32   (* --- Input --- *)
  33   function sys_HandleInput (): Boolean;
  34   procedure sys_RequestQuit;
  35
  36   (* --- Init --- *)
  37   procedure sys_Init;
  38   procedure sys_Final;
  39
  40 implementation
  41
  42   uses
  43     SysUtils, SDL2, Math, ctypes,
  44     e_log, e_graphics, e_input, e_sound,
  45     {$INCLUDE ../nogl/noGLuses.inc}
  46     {$IFDEF ENABLE_HOLMES}
  47       g_holmes, sdlcarcass, fui_ctls,
  48     {$ENDIF}
  49     g_touch, g_options, g_window, g_console, g_game, g_menu, g_gui, g_main, g_basic;
  50
  51   const
  52     GameTitle = 'Doom 2D: Forever (SDL 2, %s)';
  53
  54   var
  55     window: PSDL_Window;
  56     context: TSDL_GLContext;
  57     display, wx, wy: Integer;
  58     wc: Boolean;
  59     JoystickHandle: array [0..e_MaxJoys - 1] of PSDL_Joystick;
  60     JoystickHatState: array [0..e_MaxJoys - 1, 0..e_MaxJoyHats - 1, HAT_LEFT..HAT_DOWN] of Boolean;
  61     JoystickZeroAxes: array [0..e_MaxJoys - 1, 0..e_MaxJoyAxes - 1] of Integer;
  62
  63   (* --------- Utils --------- *)
  64
  65   function sys_GetTicks (): Int64;
  66   begin
  67     result := SDL_GetTicks()
  68   end;
  69
  70   procedure sys_Delay (ms: Integer);
  71   begin
  72     SDL_Delay(ms)
  73   end;
  74
  75   (* --------- Graphics --------- *)
  76
  77   function LoadGL: Boolean;
  78   begin
  79     result := true;
  80     {$IFDEF NOGL_INIT}
  81     nogl_Init;
  82     if glRenderToFBO and (not nogl_ExtensionSupported('GL_OES_framebuffer_object')) then
  83     {$ELSE}
  84     if glRenderToFBO and (not Load_GL_ARB_framebuffer_object) then
  85     {$ENDIF}
  86     begin
  87       e_LogWriteln('GL: framebuffer objects not supported; disabling FBO rendering');
  88       glRenderToFBO := false;
  89     end;
  90   end;
  91
  92   procedure FreeGL;
  93   begin
  94     {$IFDEF NOGL_INIT}
  95     nogl_Quit();
  96     {$ENDIF}
  97   end;
  98
  99   procedure UpdateSize (w, h: Integer);
 100   begin
 101     gWinSizeX := w;
 102     gWinSizeY := h;
 103     gRC_Width := w;
 104     gRC_Height := h;
 105     if glRenderToFBO then
 106     begin
 107       // store real window size in gWinSize, downscale resolution now
 108       w := round(w / r_pixel_scale);
 109       h := round(h / r_pixel_scale);
 110       if not e_ResizeFramebuffer(w, h) then
 111       begin
 112         e_LogWriteln('GL: could not create framebuffer, falling back to --no-fbo');
 113         glRenderToFBO := False;
 114         w := gWinSizeX;
 115         h := gWinSizeY;
 116       end;
 117     end;
 118     gScreenWidth := w;
 119     gScreenHeight := h;
 120     {$IFDEF ENABLE_HOLMES}
 121       fuiScrWdt := w;
 122       fuiScrHgt := h;
 123     {$ENDIF}
 124     e_ResizeWindow(w, h);
 125     e_InitGL;
 126     g_Game_SetupScreenSize;
 127     {$IFNDEF ANDROID}
 128       (* This will fix menu reset on keyboard showing *)
 129       g_Menu_Reset;
 130     {$ENDIF}
 131     g_Game_ClearLoading;
 132     {$IFDEF ENABLE_HOLMES}
 133       if assigned(oglInitCB) then oglInitCB;
 134     {$ENDIF}
 135   end;
 136
 137   function GetTitle (): PChar;
 138     var info: AnsiString;
 139   begin
 140     info := g_GetBuildHash(false);
 141     if info = 'custom build' then
 142       info := info + ' by ' + g_GetBuilderName() + ' ' + GAME_BUILDDATE + ' ' + GAME_BUILDTIME;
 143     result := PChar(Format(GameTitle, [info]))
 144   end;
 145
 146   function InitWindow (w, h, bpp: Integer; fullScreen, maximized: Boolean): Boolean;
 147     var flags: UInt32; x, y: cint;
 148   begin
 149     // note: on window close make: if assigned(oglDeinitCB) then oglDeinitCB;
 150     e_LogWritefln('InitWindow %s %s %s %s', [w, h, bpp, fullScreen]);
 151     result := false;
 152     if window = nil then
 153     begin
 154       {$IFDEF USE_GLES1}
 155         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);
 156         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
 157         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
 158       {$ELSE}
 159         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
 160         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
 161         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
 162         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
 163         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
 164         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
 165         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 166         SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8); // lights; it is enough to have 1-bit stencil buffer for lighting, but...
 167       {$ENDIF}
 168       flags := SDL_WINDOW_OPENGL or SDL_WINDOW_RESIZABLE;
 169       if fullScreen then flags := flags or SDL_WINDOW_FULLSCREEN;
 170       if maximized then flags := flags or SDL_WINDOW_MAXIMIZED;
 171       if wc then
 172       begin
 173         x := SDL_WINDOWPOS_CENTERED;
 174         y := SDL_WINDOWPOS_CENTERED
 175       end
 176       else
 177       begin
 178         x := wx;
 179         y := wy
 180       end;
 181       window := SDL_CreateWindow(GetTitle(), x, y, w, h, flags);
 182       if window <> nil then
 183       begin
 184         context := SDL_GL_CreateContext(window);
 185         if context <> nil then
 186         begin
 187           if not LoadGL then
 188           begin
 189             e_LogWriteln('GL: unable to load OpenGL functions', TMsgType.Fatal);
 190             SDL_GL_DeleteContext(context); context := nil;
 191             exit;
 192           end;
 193           if (fullscreen = false) and (maximized = false) and (wc = false) then
 194           begin
 195             SDL_GetWindowPosition(window, @x, @y);
 196             wx := x; wy := y
 197           end;
 198           gFullScreen := fullscreen;
 199           gWinMaximized := maximized;
 200           gRC_FullScreen := fullscreen;
 201           gRC_Maximized := maximized;
 202           UpdateSize(w, h);
 203           result := true
 204         end
 205         else
 206         begin
 207           // SDL_DestroyWindow(window);
 208           e_LogWritefln('SDL: unable to create OpenGL context: %s', [SDL_GetError])
 209         end
 210       end
 211       else
 212       begin
 213         e_LogWritefln('SDL: unable to create window: %s', [SDL_GetError])
 214       end
 215     end
 216     else
 217     begin
 218       if fullScreen then flags := SDL_WINDOW_FULLSCREEN else flags := 0;
 219       SDL_SetWindowFullscreen(window, flags);
 220       SDL_SetWindowSize(window, w, h);
 221       if maximized then SDL_MaximizeWindow(window);
 222       // always reset to center when changing fullscreen->windowed for safety purposes
 223       if wc or (gFullscreen and not fullscreen) or (gWinMaximized and not maximized) then
 224       begin
 225         x := SDL_WINDOWPOS_CENTERED;
 226         y := SDL_WINDOWPOS_CENTERED
 227       end
 228       else
 229       begin
 230         x := wx;
 231         y := wy
 232       end;
 233       SDL_SetWindowPosition(window, x, y);
 234       if (fullscreen = false) and (maximized = false) and (wc = false) then
 235       begin
 236         SDL_GetWindowPosition(window, @x, @y);
 237         wx := x; wy := y
 238       end;
 239       gFullScreen := fullscreen;
 240       gWinMaximized := maximized;
 241       gRC_FullScreen := fullscreen;
 242       gRC_Maximized := maximized;
 243       UpdateSize(w, h);
 244       result := true
 245     end
 246   end;
 247
 248   procedure sys_Repaint;
 249   begin
 250     SDL_GL_SwapWindow(window)
 251   end;
 252
 253   procedure sys_EnableVSync (yes: Boolean);
 254   begin
 255     if yes then
 256       SDL_GL_SetSwapInterval(1)
 257     else
 258       SDL_GL_SetSwapInterval(0)
 259   end;
 260
 261   function sys_GetDisplayModes (bpp: Integer): SSArray;
 262     var i, count, num, pw, ph: Integer; m: TSDL_DisplayMode;
 263   begin
 264     result := nil;
 265     num := SDL_GetNumDisplayModes(display);
 266     if num < 0 then
 267       e_LogWritefln('SDL: unable to get numer of available display modes: %s', [SDL_GetError]);
 268     if num > 0 then
 269     begin
 270       e_LogWritefln('Video modes for display %s:', [display]);
 271       SetLength(result, num);
 272       i := 0; count := 0; pw := 0; ph := 0;
 273       while i < num do
 274       begin
 275         SDL_GetDisplayMode(display, i, @m);
 276         if ((pw <> m.w) or (ph <> m.h)) then
 277         begin
 278           e_LogWritefln('* %sx%sx%s@%s', [m.w, m.h, SDL_BITSPERPIXEL(m.format), m.refresh_rate]);
 279           pw := m.w; ph := m.h;
 280           result[count] := IntToStr(m.w) + 'x' + IntToStr(m.h);
 281           Inc(count);
 282         end
 283         else
 284         begin
 285           e_LogWritefln('- %sx%sx%s@%s', [m.w, m.h, SDL_BITSPERPIXEL(m.format), m.refresh_rate]);
 286         end;
 287         Inc(i)
 288       end;
 289       SetLength(result, count)
 290     end
 291   end;
 292
 293   function sys_SetDisplayMode (w, h, bpp: Integer; fullScreen, maximized: Boolean): Boolean;
 294   begin
 295     result := InitWindow(w, h, bpp, fullScreen, maximized)
 296   end;
 297
 298   (* --------- Joystick --------- *)
 299
 300   procedure HandleJoyButton (var ev: TSDL_JoyButtonEvent);
 301     var down: Boolean; key: Integer;
 302   begin
 303     if (ev.which < e_MaxJoys) and (ev.button < e_MaxJoyBtns) then
 304     begin
 305       key := e_JoyButtonToKey(ev.which, ev.button);
 306       down := ev.type_ = SDL_JOYBUTTONDOWN;
 307       if g_dbg_input then
 308         e_LogWritefln('Input Debug: jbutton, joy=%s, button=%s, keycode=%s, press=%s', [ev.which, ev.button, key, down]);
 309       e_KeyUpDown(key, down);
 310       g_Console_ProcessBind(key, down)
 311     end
 312     else
 313     begin
 314       if g_dbg_input then
 315       begin
 316         down := ev.type_ = SDL_JOYBUTTONDOWN;
 317         e_LogWritefln('Input Debug: NOT IN RANGE! jbutton, joy=%s, button=%s, press=%s', [ev.which, ev.button, down])
 318       end
 319     end
 320   end;
 321
 322   procedure HandleJoyAxis (var ev: TSDL_JoyAxisEvent);
 323     var key, minuskey: Integer;
 324   begin
 325     if (ev.which < e_MaxJoys) and (ev.axis < e_MaxJoyAxes) then
 326     begin
 327       key := e_JoyAxisToKey(ev.which, ev.axis, AX_PLUS);
 328       minuskey := e_JoyAxisToKey(ev.which, ev.axis, AX_MINUS);
 329
 330       if g_dbg_input then
 331           e_LogWritefln('Input Debug: jaxis, joy=%s, axis=%s, value=%s, zeroaxes=%s, deadzone=%s', [ev.which, ev.axis, ev.value, JoystickZeroAxes[ev.which, ev.axis], e_JoystickDeadzones[ev.which]]);
 332
 333       if ev.value < JoystickZeroAxes[ev.which, ev.axis] - e_JoystickDeadzones[ev.which] then
 334       begin
 335         if (e_KeyPressed(key)) then
 336         begin
 337           e_KeyUpDown(key, False);
 338           g_Console_ProcessBind(key, False)
 339         end;
 340         e_KeyUpDown(minuskey, True);
 341         g_Console_ProcessBind(minuskey, True)
 342       end
 343       else if ev.value > JoystickZeroAxes[ev.which, ev.axis] + e_JoystickDeadzones[ev.which] then
 344       begin
 345         if (e_KeyPressed(minuskey)) then
 346         begin
 347           e_KeyUpDown(minuskey, False);
 348           g_Console_ProcessBind(minuskey, False)
 349         end;
 350         e_KeyUpDown(key, True);
 351         g_Console_ProcessBind(key, True)
 352       end
 353       else
 354       begin
 355         if (e_KeyPressed(minuskey)) then
 356         begin
 357           e_KeyUpDown(minuskey, False);
 358           g_Console_ProcessBind(minuskey, False)
 359         end;
 360         if (e_KeyPressed(key)) then
 361         begin
 362           e_KeyUpDown(key, False);
 363           g_Console_ProcessBind(key, False)
 364         end
 365       end
 366     end
 367     else
 368     begin
 369       if g_dbg_input then
 370         e_LogWritefln('Input Debug: NOT IN RANGE! jaxis, joy=%s, axis=%s, value=%s, zeroaxes=%s, deadzone=%s', [ev.which, ev.axis, ev.value, JoystickZeroAxes[ev.which, ev.axis], e_JoystickDeadzones[ev.which]])
 371     end
 372   end;
 373
 374   procedure HandleJoyHat (var ev: TSDL_JoyHatEvent);
 375     var
 376       down: Boolean;
 377       i, key: Integer;
 378       hat: array [HAT_LEFT..HAT_DOWN] of Boolean;
 379   begin
 380     if (ev.which < e_MaxJoys) and (ev.hat < e_MaxJoyHats) then
 381     begin
 382       if g_dbg_input then
 383         e_LogWritefln('Input Debug: jhat, joy=%s, hat=%s, value=%s', [ev.which, ev.hat, ev.value]);
 384       hat[HAT_UP] := LongBool(ev.value and SDL_HAT_UP);
 385       hat[HAT_DOWN] := LongBool(ev.value and SDL_HAT_DOWN);
 386       hat[HAT_LEFT] := LongBool(ev.value and SDL_HAT_LEFT);
 387       hat[HAT_RIGHT] := LongBool(ev.value and SDL_HAT_RIGHT);
 388       for i := HAT_LEFT to HAT_DOWN do
 389       begin
 390         if JoystickHatState[ev.which, ev.hat, i] <> hat[i] then
 391         begin
 392           down := hat[i];
 393           key := e_JoyHatToKey(ev.which, ev.hat, i);
 394           e_KeyUpDown(key, down);
 395           g_Console_ProcessBind(key, down)
 396         end
 397       end;
 398       JoystickHatState[ev.which, ev.hat] := hat
 399     end
 400     else
 401     begin
 402       if g_dbg_input then
 403         e_LogWritefln('Input Debug: NOT IN RANGE! jhat, joy=%s, hat=%s, value=%s', [ev.which, ev.hat, ev.value])
 404     end
 405   end;
 406
 407   procedure HandleJoyAdd (var ev: TSDL_JoyDeviceEvent);
 408     var i: Integer;
 409   begin
 410     if (ev.which < e_MaxJoys) then
 411     begin
 412       JoystickHandle[ev.which] := SDL_JoystickOpen(ev.which);
 413       if JoystickHandle[ev.which] <> nil then
 414       begin
 415         e_LogWritefln('Added Joystick %s', [ev.which]);
 416         e_JoystickAvailable[ev.which] := True;
 417         for i := 0 to Min(SDL_JoystickNumAxes(JoystickHandle[ev.which]), e_MaxJoyAxes) - 1 do
 418           JoystickZeroAxes[ev.which, i] := SDL_JoystickGetAxis(JoystickHandle[ev.which], i)
 419       end
 420       else
 421       begin
 422         e_LogWritefln('Warning! Failed to open Joystick %s', [ev.which])
 423       end
 424     end
 425     else
 426     begin
 427       e_LogWritefln('Warning! Added Joystick %s, but we support only <= %s', [ev.which, e_MaxJoys])
 428     end
 429   end;
 430
 431   procedure HandleJoyRemove (var ev: TSDL_JoyDeviceEvent);
 432   begin
 433     e_LogWritefln('Removed Joystick %s', [ev.which]);
 434     if (ev.which < e_MaxJoys) then
 435     begin
 436       e_JoystickAvailable[ev.which] := False;
 437       if JoystickHandle[ev.which] <> nil then
 438         SDL_JoystickClose(JoystickHandle[ev.which]);
 439       JoystickHandle[ev.which] := nil
 440     end
 441   end;
 442
 443   (* --------- Input --------- *)
 444
 445   function HandleWindow (var ev: TSDL_WindowEvent): Boolean;
 446   begin
 447     result := false;
 448     if g_dbg_input then
 449       e_LogWritefln('Window Event: event = %s, data1 = %s, data2 = %s', [ev.event, ev.data1, ev.data2]);
 450     case ev.event of
 451       SDL_WINDOWEVENT_RESIZED: UpdateSize(ev.data1, ev.data2);
 452       SDL_WINDOWEVENT_EXPOSED: sys_Repaint;
 453       SDL_WINDOWEVENT_CLOSE: result := true;
 454       SDL_WINDOWEVENT_MOVED:
 455         begin
 456           wx := ev.data1;
 457           wy := ev.data2
 458         end;
 459       SDL_WINDOWEVENT_FOCUS_LOST, SDL_WINDOWEVENT_MINIMIZED:
 460         begin
 461           e_UnpressAllKeys;
 462           if gMuteWhenInactive then
 463             e_MuteChannels(true);
 464           {$IFDEF ENABLE_HOLMES}
 465             if assigned(winBlurCB) then winBlurCB;
 466           {$ENDIF}
 467         end;
 468       SDL_WINDOWEVENT_FOCUS_GAINED, SDL_WINDOWEVENT_MAXIMIZED, SDL_WINDOWEVENT_RESTORED:
 469         begin
 470           if ev.event = SDL_WINDOWEVENT_MAXIMIZED then
 471           begin
 472             gWinMaximized := true;
 473             gRC_Maximized := true
 474           end
 475           else if ev.event = SDL_WINDOWEVENT_RESTORED then
 476           begin
 477             gWinMaximized := false;
 478             gRC_Maximized := false
 479           end;
 480           e_MuteChannels(false);
 481           {$IFDEF ENABLE_HOLMES}
 482             if assigned(winFocusCB) then winFocusCB;
 483           {$ENDIF}
 484         end;
 485     end
 486   end;
 487
 488   procedure HandleKeyboard (var ev: TSDL_KeyboardEvent);
 489     var down: Boolean; key: Integer;
 490   begin
 491     key := ev.keysym.scancode;
 492     down := (ev.type_ = SDL_KEYDOWN);
 493     if key = SDL_SCANCODE_AC_BACK then
 494       key := SDL_SCANCODE_ESCAPE;
 495     {$IFDEF ENABLE_HOLMES}
 496       if fuiOnSDLEvent(PSDL_Event(@ev)^) then
 497       begin
 498         // event eaten, but...
 499         if not down then e_KeyUpDown(key, false);
 500         exit;
 501       end;
 502     {$ENDIF}
 503     if ev._repeat = 0 then
 504     begin
 505       if g_dbg_input then
 506         e_LogWritefln('Input Debug: keysym, press=%s, scancode=%s', [down, key]);
 507       e_KeyUpDown(key, down);
 508       g_Console_ProcessBind(key, down);
 509     end
 510     else
 511     begin
 512       if g_dbg_input then
 513         e_LogWritefln('Input Debug: keyrep, scancode=%s', [key]);
 514       g_Console_ProcessBindRepeat(key);
 515     end
 516   end;
 517
 518   procedure HandleTextInput (var ev: TSDL_TextInputEvent);
 519     var ch: UnicodeChar; sch: AnsiChar;
 520   begin
 521     Utf8ToUnicode(@ch, PChar(ev.text), 1);
 522     sch := AnsiChar(wchar2win(ch));
 523     if g_dbg_input then
 524       e_LogWritefln('Input Debug: text, text="%s", ch = %s, sch = %s', [ev.text, Ord(ch), Ord(sch)]);
 525     if IsValid1251(Word(ch)) and IsPrintable1251(ch) then
 526       CharPress(sch);
 527   end;
 528
 529   function sys_HandleInput (): Boolean;
 530     var ev: TSDL_Event;
 531   begin
 532     result := false;
 533     ZeroMemory(@ev, sizeof(ev));
 534     while SDL_PollEvent(@ev) <> 0 do
 535     begin
 536       case ev.type_ of
 537         SDL_QUITEV: result := true;
 538         SDL_WINDOWEVENT: result := HandleWindow(ev.window);
 539         SDL_KEYUP, SDL_KEYDOWN: HandleKeyboard(ev.key);
 540         SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP: HandleJoyButton(ev.jbutton);
 541         SDL_JOYAXISMOTION: HandleJoyAxis(ev.jaxis);
 542         SDL_JOYHATMOTION: HandleJoyHat(ev.jhat);
 543         SDL_JOYDEVICEADDED: HandleJoyAdd(ev.jdevice);
 544         SDL_JOYDEVICEREMOVED: HandleJoyRemove(ev.jdevice);
 545         SDL_TEXTINPUT: HandleTextInput(ev.text);
 546         SDL_FINGERMOTION, SDL_FINGERDOWN, SDL_FINGERUP: g_Touch_HandleEvent(ev.tfinger);
 547         {$IFDEF ENABLE_HOLMES}
 548           SDL_MOUSEBUTTONDOWN, SDL_MOUSEBUTTONUP, SDL_MOUSEWHEEL, SDL_MOUSEMOTION: fuiOnSDLEvent(ev);
 549         {$ENDIF}
 550       end
 551     end
 552   end;
 553
 554   procedure sys_RequestQuit;
 555     var ev: TSDL_Event;
 556   begin
 557     ev.type_ := SDL_QUITEV;
 558     SDL_PushEvent(@ev)
 559   end;
 560
 561   (* --------- Init --------- *)
 562
 563   procedure sys_Init;
 564     var flags: UInt32;
 565   begin
 566     e_WriteLog('Init SDL2', TMsgType.Notify);
 567     {$IFDEF HEADLESS}
 568       {$IFDEF USE_SDLMIXER}
 569         flags := SDL_INIT_TIMER or SDL_INIT_AUDIO or $00004000;
 570       {$ELSE}
 571         flags := SDL_INIT_TIMER or $00004000;
 572       {$ENDIF}
 573     {$ELSE}
 574       flags := SDL_INIT_TIMER or SDL_INIT_VIDEO;
 575     {$ENDIF}
 576     SDL_SetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, '0');
 577     if SDL_Init(flags) <> 0 then
 578       raise Exception.Create('SDL: Init failed: ' + SDL_GetError);
 579     {$IFNDEF HEADLESS}
 580       if SDL_InitSubSystem(SDL_INIT_JOYSTICK) <> 0 then
 581         e_LogWritefln('SDL: Init subsystem failed: %s', [SDL_GetError()]);
 582     {$ENDIF}
 583     SDL_ShowCursor(SDL_DISABLE);
 584   end;
 585
 586   procedure sys_Final;
 587   begin
 588     e_WriteLog('Releasing SDL2', TMsgType.Notify);
 589     if context <> nil then
 590     begin
 591       FreeGL;
 592       SDL_GL_DeleteContext(context);
 593       context := nil;
 594     end;
 595     if window <> nil then
 596     begin
 597       SDL_DestroyWindow(window);
 598       window := nil;
 599     end;
 600     SDL_Quit
 601   end;
 602
 603 initialization
 604   conRegVar('sdl2_display_index', @display, 'use display index as base', '');
 605   conRegVar('sdl2_window_x', @wx, 'window position x', '');
 606   conRegVar('sdl2_window_y', @wy, 'window position y', '');
 607   conRegVar('sdl2_window_center', @wc, 'force window creation at center', '');
 608   display := 0;
 609   wx := SDL_WINDOWPOS_CENTERED;
 610   wy := SDL_WINDOWPOS_CENTERED;
 611   wc := false
 612 end.