(*
 * Hedgewars, a free turn based strategy game
 * Copyright (c) 2004-2008 Andrey Korotaev <unC0Rr@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *)

{$INCLUDE "options.inc"}

unit SDLh;
interface

{$IFDEF LINUX}
  {$DEFINE UNIX}
{$ENDIF}
{$IFDEF FREEBSD}
  {$DEFINE UNIX}
{$ENDIF}
{$IFDEF DARWIN}
  {$DEFINE UNIX}
{$ENDIF}
{$IFDEF HAIKU}
  {$DEFINE UNIX}
{$ENDIF}

{$IFDEF UNIX}
  {$IFNDEF DARWIN}
    {$linklib c}
  {$ENDIF}
  {$IFDEF HAIKU}
    {$linklib root}
  {$ELSE}
    {$linklib pthread}
  {$ENDIF}
{$ENDIF}

{$IFDEF FPC}
  {$PACKRECORDS C}
{$ELSE}
  {$DEFINE cdecl attribute(cdecl)}
{$ENDIF}

{$IFDEF DARWIN}
  {$IFNDEF IPHONEOS}
    {$PASCALMAINNAME SDL_main}
    {$linkframework Cocoa}
    {$linkframework SDL}
    {$linkframework SDL_net}
    {$linkframework SDL_image}
    {$linkframework SDL_ttf}
    {$linkframework SDL_mixer}
  {$ENDIF}
{$ENDIF}


(*  SDL  *)
const
{$IFDEF WIN32}
    SDLLibName = 'SDL.dll';
    SDL_TTFLibName = 'SDL_ttf.dll';
    SDL_MixerLibName = 'SDL_mixer.dll';
    SDL_ImageLibName = 'SDL_image.dll';
    SDL_NetLibName = 'SDL_net.dll';
{$ELSE}
  {$IFDEF DARWIN}
    SDLLibName = 'SDL';
    SDL_TTFLibName = 'SDL_ttf';
    SDL_MixerLibName = 'SDL_mixer';
    SDL_ImageLibName = 'SDL_image';
    SDL_NetLibName = 'SDL_net';
  {$ELSE}
    SDLLibName = 'libSDL.so';
    SDL_TTFLibName = 'libSDL_ttf.so';
    SDL_MixerLibName = 'libSDL_mixer.so';
    SDL_ImageLibName = 'libSDL_image.so';
    SDL_NetLibName = 'libSDL_net.so';
  {$ENDIF}
{$ENDIF}

/////////////////////////////////////////////////////////////////
/////////////////////  CONSTANT DEFINITIONS /////////////////////
/////////////////////////////////////////////////////////////////

    SDL_SWSURFACE     = $00000000;
    SDL_HWSURFACE     = $00000001;
    SDL_SRCALPHA      = $00010000;
    
    SDL_INIT_TIMER    = $00000001;
    SDL_INIT_AUDIO    = $00000010;
    SDL_INIT_VIDEO    = $00000020;
    SDL_INIT_JOYSTICK = $00000200;
{$IFDEF SDL13}
    SDL_INIT_HAPTIC   = $00001000;
{$ELSE}
    SDL_INIT_CDROM    = $00000100;
{$ENDIF}
    SDL_INIT_NOPARACHUTE = $00100000;
    SDL_INIT_EVENTTHREAD = $01000000;
    SDL_INIT_EVERYTHING  = $0000FFFF;

    SDL_APPINPUTFOCUS    = 2;
    SDL_BUTTON_WHEELUP   = 4;
    SDL_BUTTON_WHEELDOWN = 5;
        
{*begin SDL_Event binding*}

{$IFDEF SDL13}
    SDL_FIRSTEVENT = 0;
    SDL_QUITEV = $100;
    SDL_WINDOWEVENT = $200;
    SDL_SYSWMEVENT = $201;
    SDL_KEYDOWN = $300;
    SDL_KEYUP = $301;
    SDL_TEXTEDITING = $302;
    SDL_TEXTINPUT = $303;
    SDL_MOUSEMOTION  = $400;
    SDL_MOUSEBUTTONDOWN = $401;
    SDL_MOUSEBUTTONUP = $402;
    SDL_MOUSEWHEEL = $403;
    SDL_PROXIMITYIN = $500;
    SDL_PROXIMITYOUT = $501;
    SDL_JOYAXISMOTION = $600;
    SDL_JOYBALLMOTION = $601;
    SDL_JOYHATMOTION = $602;
    SDL_JOYBUTTONDOWN = $603;
    SDL_JOYBUTTONUP = $604;
    SDL_USEREVENT = $8000;
    SDL_LASTEVENT = $FFFF;
{$ELSE}
    SDL_NOEVENT = 0;
    SDL_ACTIVEEVENT = 1;
    SDL_KEYDOWN = 2;
    SDL_KEYUP = 3;
    SDL_MOUSEMOTION  = 4;
    SDL_MOUSEBUTTONDOWN = 5;
    SDL_MOUSEBUTTONUP   = 6;
    SDL_JOYAXISMOTION = 7;
    SDL_JOYBALLMOTION = 8;
    SDL_JOYHATMOTION = 9;
    SDL_JOYBUTTONDOWN = 10;
    SDL_JOYBUTTONUP = 11;
    SDL_QUITEV = 12;
    SDL_VIDEORESIZE = 16; // TODO: outdated? no longer in SDL 1.3?
{$ENDIF}
{*end SDL_Event binding*}
        
{$IFDEF SDL13}
    SDL_ASYNCBLIT   = $08000000;
    SDL_ANYFORMAT   = $10000000;
    SDL_HWPALETTE   = $00200000;
    SDL_DOUBLEBUF   = $00400000;
    SDL_FULLSCREEN  = $00800000;
    SDL_HWACCEL     = $08000000;
    SDL_SRCCOLORKEY = $00020000;
    SDL_RLEACCEL    = $08000000;
    SDL_NOFRAME     = $02000000;
    SDL_OPENGL      = $04000000;
    SDL_RESIZABLE   = $01000000;
{$ELSE}
    SDL_ASYNCBLIT   = $00000004;
    SDL_ANYFORMAT   = $00100000;
    SDL_HWPALETTE   = $20000000;
    SDL_DOUBLEBUF   = $40000000;
    SDL_FULLSCREEN  = $80000000;
    SDL_HWACCEL     = $00000100;
    SDL_SRCCOLORKEY = $00001000;
    SDL_RLEACCEL    = $00004000;
    SDL_NOFRAME     = $00000020;
    SDL_OPENGL      = $00000002;
    SDL_RESIZABLE   = $00000010;
{$ENDIF}


{$IFDEF ENDIAN_LITTLE}
    RMask = $000000FF;
    GMask = $0000FF00;
    BMask = $00FF0000;
    AMask = $FF000000;
{$ELSE}
    RMask = $FF000000;
    GMask = $00FF0000;
    BMask = $0000FF00;
    AMask = $000000FF;
{$ENDIF}

{$IFDEF SDL13}
// SDL_WindowFlags (enum)
    SDL_WINDOW_FULLSCREEN = $00000001;         //*< fullscreen window, implies borderless */
    SDL_WINDOW_OPENGL = $00000002;             //*< window usable with OpenGL context */
    SDL_WINDOW_SHOWN = $00000004;              //*< window is visible */
    SDL_WINDOW_BORDERLESS = $00000008;         //*< no window decoration */
    SDL_WINDOW_RESIZABLE = $00000010;          //*< window can be resized */
    SDL_WINDOW_MINIMIZED = $00000020;          //*< window is minimized */
    SDL_WINDOW_MAXIMIZED = $00000040;          //*< window is maximized */
    SDL_WINDOW_INPUT_GRABBED = $00000100;      //*< window has grabbed input focus */
    SDL_WINDOW_INPUT_FOCUS = $00000200;        //*< window has input focus */
    SDL_WINDOW_MOUSE_FOCUS = $00000400;        //*< window has mouse focus */
    SDL_WINDOW_FOREIGN = $00000800;            //*< window not created by SDL */
{$ENDIF}

    {* SDL_mixer *}
    MIX_MAX_VOLUME = 128;
    MIX_INIT_FLAC = $00000001;
    MIX_INIT_MOD  = $00000002;
    MIX_INIT_MP3  = $00000004;
    MIX_INIT_OGG  = $00000008;
    
    {* SDL_TTF *}
    TTF_STYLE_NORMAL = 0;
    TTF_STYLE_BOLD   = 1;
    TTF_STYLE_ITALIC = 2;

    {* SDL Joystick *}
    SDL_HAT_CENTERED  = $00;
    SDL_HAT_UP        = $01;
    SDL_HAT_RIGHT     = $02;
    SDL_HAT_DOWN      = $04;
    SDL_HAT_LEFT      = $08;
    SDL_HAT_RIGHTUP   = SDL_HAT_RIGHT or SDL_HAT_UP;
    SDL_HAT_RIGHTDOWN = SDL_HAT_RIGHT or SDL_HAT_DOWN;
    SDL_HAT_LEFTUP    = SDL_HAT_LEFT or SDL_HAT_UP;
    SDL_HAT_LEFTDOWN  = SDL_HAT_LEFT or SDL_HAT_DOWN;

    {* SDL_image *}
    IMG_INIT_JPG = $00000001;
    IMG_INIT_PNG = $00000002;
    IMG_INIT_TIF = $00000004;

/////////////////////////////////////////////////////////////////
///////////////////////  TYPE DEFINITIONS ///////////////////////
/////////////////////////////////////////////////////////////////

type 
    PSDL_Rect = ^TSDL_Rect;
    TSDL_Rect = record
{$IFDEF SDL13}
        x, y, w, h: LongInt;
{$ELSE}
        x, y: SmallInt;
        w, h: Word;
{$ENDIF}
        end;

    TPoint = record
        X: LongInt;
        Y: LongInt;
        end;

    PSDL_PixelFormat = ^TSDL_PixelFormat;
    TSDL_PixelFormat = record
        palette: Pointer;
        BitsPerPixel : Byte;
        BytesPerPixel: Byte;
        Rloss : Byte;
        Gloss : Byte;
        Bloss : Byte;
        Aloss : Byte;
        Rshift: Byte;
        Gshift: Byte;
        Bshift: Byte;
        Ashift: Byte;
        RMask : Longword;
        GMask : Longword;
        BMask : Longword;
        AMask : Longword;
        colorkey: Longword;
        alpha : Byte;
        end;


    PSDL_Surface = ^TSDL_Surface;
    TSDL_Surface = record
        flags : Longword;
        format: PSDL_PixelFormat;
        w, h  : LongInt;
        pitch : Word;
        pixels: Pointer;
        offset: LongInt;
        end;


    PSDL_Color = ^TSDL_Color;
    TSDL_Color = record
        case byte of
            0: (    r: Byte;
                g: Byte;
                b: Byte;
                unused: Byte;
               );
            1: (    value: Longword);
        end;


    PSDL_RWops = ^TSDL_RWops;
    TSeek  = function( context: PSDL_RWops; offset: LongInt; whence: LongInt ): LongInt; cdecl;
    TRead  = function( context: PSDL_RWops; Ptr: Pointer; size: LongInt; maxnum : LongInt ): LongInt;  cdecl;
    TWrite = function( context: PSDL_RWops; Ptr: Pointer; size: LongInt; num: LongInt ): LongInt; cdecl;
    TClose = function( context: PSDL_RWops ): LongInt; cdecl;

    TStdio = record
        autoclose: LongInt;
        fp: pointer;
        end;

    TMem = record
        base: PByte;
        here: PByte;
        stop: PByte;
        end;

    TUnknown = record
        data1: Pointer;
        end;

    TSDL_RWops = record
        seek: TSeek;
        read: TRead;
        write: TWrite;
        close: TClose;
        type_: Longword;
        case Byte of
            0: (stdio: TStdio);
            1: (mem: TMem);
            2: (unknown: TUnknown);
            end;

    TSDL_KeySym = record
        scancode: Byte;
        sym: Longword;
        modifier: Longword;
        unicode: Word;
        end;


{* SDL_Event type definition *}

{$IFDEF SDL13}
    PSDL_Window = pointer;  
    PSDL_Texture = pointer;
    
    TSDL_WindowEvent = record
        type_: LongInt;
        windowID: LongInt;
        event: byte;
        padding1, padding2, padding3: byte;
        data1, data2: LongInt;
        end;

// implement SDL_TextEditingEvent + SDL_TextInputEvent for sdl13
{$ELSE}
    // these two are present in sdl1.3 but only for backward compatibility
    // and in 1.3 type_ is LongInt, not byte
    TSDL_ActiveEvent = record
        type_: byte;
        gain: byte;
        state: byte;
        end;

    TSDL_ResizeEvent = record
        type_: Byte;
        w, h: LongInt;
        end;
{$ENDIF}

    TSDL_MouseMotionEvent = record
        which: byte;
        state: byte;
{$IFDEF SDL13}
        type_: LongInt;
        windowID: LongInt;
        padding1, padding2: byte;
        x, y, z, xrel, yrel : LongInt;
        pressure, pressure_max, pressure_min,
        rotation, tilt, cursor: LongInt; 
{$ELSE}
        type_: byte;
        x, y, xrel, yrel : word;
{$ENDIF}
        end;

    TSDL_KeyboardEvent = record
{$IFDEF SDL13}
        type_: LongInt;
        windowID: LongInt;
        padding1, padding2: byte;
{$ELSE}
        type_: byte;
{$ENDIF}
        which: byte;
        state: byte;
        keysym: TSDL_KeySym;
        end;

    TSDL_MouseButtonEvent = record

{$IFDEF SDL13}
        _type: LongInt;
        windowID: LongInt;
        x, y: LongInt;
        padding1: byte;
{$ELSE}
        _type,
        which,
        button,
        state: byte;
        x, y: word;
{$ENDIF}
        end;

{$IFDEF SDL13}
    TSDL_MouseWheelEvent = record
        type_: LongInt;
        windowID: LongInt;
        which: Byte;
        x, y: LongInt;
        padding1, padding2, padding3: byte;
        end;
        
    // implement SDL_ProximityEvent
{$ENDIF}

    TSDL_JoyAxisEvent = record
        type_: Byte;
        which: Byte;
        axis: Byte;
{$IFDEF SDL13}
        value: LongInt;
{$ELSE}
        value: word;
{$ENDIF}    
        end;
            
    TSDL_JoyBallEvent = record
        which: Byte;
        ball: Byte;
{$IFDEF SDL13}
        type_: LongInt;
        xrel, yrel: LongInt;
{$ELSE}
        type_: Byte;
        xrel, yrel: word;
{$ENDIF}
        end;

    TSDL_JoyHatEvent = record
{$IFDEF SDL13}
        type_: LongInt;
{$ELSE}
        type_: Byte;
{$ENDIF}
        which: Byte;
        hat: Byte;
        value: Byte;
        end;
    
    TSDL_JoyButtonEvent = record
{$IFDEF SDL13}
        type_: LongInt;
{$ELSE}
        type_: Byte;
{$ENDIF}
        which: Byte;
        button: Byte;
        state: Byte;
        end;

    TSDL_QuitEvent = record
{$IFDEF SDL13}
        type_: LongInt;
{$ELSE}
        type_: Byte;
{$ENDIF}
        end;

    PSDL_Event = ^TSDL_Event;
    TSDL_Event = record
        case Byte of
{$IFDEF SDL13}
            SDL_FIRSTEVENT: (type_: byte);
            SDL_QUITEV: (quit: TSDL_QuitEvent);
            SDL_WINDOWEVENT: (active: TSDL_WindowEvent);
            SDL_KEYDOWN,
            SDL_KEYUP: (key: TSDL_KeyboardEvent);
            SDL_TEXTEDITING,
            SDL_TEXTINPUT: (txtin: byte);
            SDL_MOUSEMOTION: (motion: TSDL_MouseMotionEvent);
            SDL_MOUSEBUTTONDOWN,
            SDL_MOUSEBUTTONUP: (button: TSDL_MouseButtonEvent);
            SDL_MOUSEWHEEL: (wheel: TSDL_MouseWheelEvent);
            SDL_JOYAXISMOTION: (jaxis: TSDL_JoyAxisEvent);
            SDL_JOYHATMOTION: (jhat: TSDL_JoyHatEvent);
            SDL_JOYBALLMOTION: (jball: TSDL_JoyBallEvent);
            SDL_JOYBUTTONDOWN,
            SDL_JOYBUTTONUP: (jbutton: TSDL_JoyButtonEvent);
{$ELSE}
            SDL_NOEVENT: (type_: byte);
            SDL_ACTIVEEVENT: (active: TSDL_ActiveEvent);
            SDL_KEYDOWN,
            SDL_KEYUP: (key: TSDL_KeyboardEvent);
            SDL_MOUSEMOTION: (motion: TSDL_MouseMotionEvent);
            SDL_MOUSEBUTTONDOWN,
            SDL_MOUSEBUTTONUP: (button: TSDL_MouseButtonEvent);
            SDL_JOYAXISMOTION: (jaxis: TSDL_JoyAxisEvent);
            SDL_JOYHATMOTION: (jhat: TSDL_JoyHatEvent);
            SDL_JOYBALLMOTION: (jball: TSDL_JoyBallEvent);
            SDL_JOYBUTTONDOWN,
            SDL_JOYBUTTONUP: (jbutton: TSDL_JoyButtonEvent);
            SDL_QUITEV: (quit: TSDL_QuitEvent);
            //SDL_SYSWMEVENT,SDL_EVENT_RESERVEDA,SDL_EVENT_RESERVEDB
            //SDL_VIDEORESIZE: (resize: TSDL_ResizeEvent);
{$ENDIF}
        end;

    PByteArray = ^TByteArray;
    TByteArray = array[0..65535] of Byte;
    PLongWordArray = ^TLongWordArray;
    TLongWordArray = array[0..16383] of LongWord;

    PSDL_Thread = Pointer;
    PSDL_mutex = Pointer;

    TSDL_GLattr = (
        SDL_GL_RED_SIZE,
        SDL_GL_GREEN_SIZE,
        SDL_GL_BLUE_SIZE,
        SDL_GL_ALPHA_SIZE,
        SDL_GL_BUFFER_SIZE,
        SDL_GL_DOUBLEBUFFER,
        SDL_GL_DEPTH_SIZE,
        SDL_GL_STENCIL_SIZE,
        SDL_GL_ACCUM_RED_SIZE,
        SDL_GL_ACCUM_GREEN_SIZE,
        SDL_GL_ACCUM_BLUE_SIZE,
        SDL_GL_ACCUM_ALPHA_SIZE,
        SDL_GL_STEREO,
        SDL_GL_MULTISAMPLEBUFFERS,
        SDL_GL_MULTISAMPLESAMPLES,
        SDL_GL_ACCELERATED_VISUAL,
{$IFDEF SDL13}
        SDL_GL_RETAINED_BACKING,
        SDL_GL_CONTEXT_MAJOR_VERSION,
        SDL_GL_CONTEXT_MINOR_VERSION
{$ELSE}
        SDL_GL_SWAP_CONTROL
{$ENDIF}
        );

{$IFDEF SDL13}
    TSDL_ArrayByteOrder = (  // array component order, low byte -> high byte 
        SDL_ARRAYORDER_NONE,
        SDL_ARRAYORDER_RGB,
        SDL_ARRAYORDER_RGBA,
        SDL_ARRAYORDER_ARGB,
        SDL_ARRAYORDER_BGR,
        SDL_ARRAYORDER_BGRA,
        SDL_ARRAYORDER_ABGR
        );
{$ENDIF}

// Joystick/Controller support
    PSDL_Joystick = ^TSDL_Joystick;
    TSDL_Joystick = record
            end;

    {* SDL_TTF *}
    PTTF_Font = ^TTTF_font;
    TTTF_Font = record
            end;

    {* SDL_mixer *}
    PMixChunk = ^TMixChunk;
    TMixChunk = record
        allocated: Longword;
        abuf     : PByte;
        alen     : Longword;
        volume   : PByte;
        end;
    TMusic = (MUS_CMD, MUS_WAV, MUS_MOD, MUS_MID, MUS_OGG, MUS_MP3);
    TMix_Fading = (MIX_NO_FADING, MIX_FADING_OUT, MIX_FADING_IN);

    TMidiSong = record
               samples : LongInt;
               events  : pointer;
               end;

    TMusicUnion = record
        case Byte of
             0: ( midi : TMidiSong );
             1: ( ogg  : pointer);
             end;

    PMixMusic = ^TMixMusic;
    TMixMusic = record
                 end;

    {* SDL_net *}
    TIPAddress = record
                  host: Longword;
                  port: Word;
                  end;

    PTCPSocket = ^TTCPSocket;
    TTCPSocket = record
                  ready: LongInt;
                  channel: LongInt;
                  remoteAddress: TIPaddress;
                  localAddress: TIPaddress;
                  sflag: LongInt;
                  end;
    PSDLNet_SocketSet = ^TSDLNet_SocketSet;
    TSDLNet_SocketSet = record
                         numsockets,
                         maxsockets: LongInt;
                         sockets: PTCPSocket;
                         end;


/////////////////////////////////////////////////////////////////
/////////////////////  FUNCTION DEFINITIONS /////////////////////
/////////////////////////////////////////////////////////////////


{* SDL *}
function  SDL_Init(flags: Longword): LongInt; cdecl; external SDLLibName;
function  SDL_InitSubSystem(flags: LongWord): LongInt; cdecl; external SDLLibName;
procedure SDL_Quit; cdecl; external SDLLibName;

function  SDL_VideoDriverName(var namebuf; maxlen: LongInt): PChar; cdecl; external SDLLibName;
procedure SDL_EnableUNICODE(enable: LongInt); cdecl; external SDLLibName;

procedure SDL_Delay(msec: Longword); cdecl; external SDLLibName;
function  SDL_GetTicks: Longword; cdecl; external SDLLibName;

function  SDL_MustLock(Surface: PSDL_Surface): Boolean;
function  SDL_LockSurface(Surface: PSDL_Surface): LongInt; cdecl; external SDLLibName;
procedure SDL_UnlockSurface(Surface: PSDL_Surface); cdecl; external SDLLibName;

function  SDL_GetError: PChar; cdecl; external SDLLibName;

function  SDL_SetVideoMode(width, height, bpp: LongInt; flags: Longword): PSDL_Surface; cdecl; external SDLLibName;
function  SDL_CreateRGBSurface(flags: Longword; Width, Height, Depth: LongInt; RMask, GMask, BMask, AMask: Longword): PSDL_Surface; cdecl; external SDLLibName;
function  SDL_CreateRGBSurfaceFrom(pixels: Pointer; width, height, depth, pitch: LongInt; RMask, GMask, BMask, AMask: Longword): PSDL_Surface; cdecl; external SDLLibName;
procedure SDL_FreeSurface(Surface: PSDL_Surface); cdecl; external SDLLibName;
function  SDL_SetColorKey(surface: PSDL_Surface; flag, key: Longword): LongInt; cdecl; external SDLLibName;
function  SDL_SetAlpha(surface: PSDL_Surface; flag, key: Longword): LongInt; cdecl; external SDLLibName;
function  SDL_ConvertSurface(src: PSDL_Surface; fmt: PSDL_PixelFormat; flags: LongInt): PSDL_Surface; cdecl; external SDLLibName;

function  SDL_UpperBlit(src: PSDL_Surface; srcrect: PSDL_Rect; dst: PSDL_Surface; dstrect: PSDL_Rect): LongInt; cdecl; external SDLLibName;
function  SDL_FillRect(dst: PSDL_Surface; dstrect: PSDL_Rect; color: Longword): LongInt; cdecl; external SDLLibName;
procedure SDL_UpdateRect(Screen: PSDL_Surface; x, y: LongInt; w, h: Longword); cdecl; external SDLLibName;
function  SDL_Flip(Screen: PSDL_Surface): LongInt; cdecl; external SDLLibName;

procedure SDL_GetRGB(pixel: Longword; fmt: PSDL_PixelFormat; r, g, b: PByte); cdecl; external SDLLibName;
procedure SDL_GetRGBA(pixel: Longword; fmt: PSDL_PixelFormat; r, g, b, a: PByte); cdecl; external SDLLibName;
function  SDL_MapRGB(format: PSDL_PixelFormat; r, g, b: Byte): Longword; cdecl; external SDLLibName;
function  SDL_MapRGBA(format: PSDL_PixelFormat; r, g, b, a: Byte): Longword; cdecl; external SDLLibName;

function  SDL_DisplayFormat(Surface: PSDL_Surface): PSDL_Surface; cdecl; external SDLLibName;
function  SDL_DisplayFormatAlpha(Surface: PSDL_Surface): PSDL_Surface; cdecl; external SDLLibName;

function  SDL_RWFromFile(filename, mode: PChar): PSDL_RWops; cdecl; external SDLLibName;
function  SDL_SaveBMP_RW(surface: PSDL_Surface; dst: PSDL_RWops; freedst: LongInt): LongInt; cdecl; external SDLLibName;

{$IFDEF SDL13}
function  SDL_CreateWindow(title: PChar; x,y,w,h, flags: LongInt): PSDL_Window; cdecl; external SDLLibName;      
function  SDL_CreateRenderer(window: PSDL_Window; index, flags: LongInt): LongInt; cdecl; external SDLLibName;   
function  SDL_SetRenderDrawColor(r,g,b,a: byte): LongInt; cdecl; external SDLLibName;

function  SDL_RenderFill(rect: PSDL_Rect): LongInt;
function  SDL_RenderFillRect(rect: PSDL_Rect): LongInt; cdecl; external SDLLibName;
function  SDL_RenderClear: LongInt; cdecl; external SDLLibName;
procedure SDL_RenderPresent; cdecl; external SDLLibName;
procedure SDL_VideoQuit; cdecl; external SDLLibName;

function  SDL_SelectMouse(index: LongInt): LongInt; cdecl; external SDLLibName;
function  SDL_GetRelativeMouseState(x, y: PLongInt): Byte; cdecl; external SDLLibName;
function  SDL_GetNumMice: LongInt; cdecl; external SDLLibName;
function  SDL_PixelFormatEnumToMasks(format: TSDL_ArrayByteOrder; bpp: PLongInt; Rmask, Gmask, Bmask, Amask: PLongInt): boolean; cdecl; external SDLLibName;
{$ENDIF}

function  SDL_GetKeyState(numkeys: PLongInt): PByteArray; cdecl; external SDLLibName {$IFDEF SDL13} name 'SDL_GetKeyboardState'{$ENDIF};
function  SDL_GetMouseState(x, y: PLongInt): Byte; cdecl; external SDLLibName;
function  SDL_GetKeyName(key: Longword): PChar; cdecl; external SDLLibName;
procedure SDL_WarpMouse(x, y: Word); cdecl; external SDLLibName;

procedure SDL_PumpEvents; cdecl; external SDLLibName;
function  SDL_PollEvent(event: PSDL_Event): LongInt; cdecl; external SDLLibName;
function  SDL_WaitEvent(event: PSDL_Event): LongInt; cdecl; external SDLLibName;

function  SDL_ShowCursor(toggle: LongInt): LongInt; cdecl; external SDLLibName;

procedure SDL_WM_SetIcon(icon: PSDL_Surface; mask : byte); cdecl; external SDLLibName;
procedure SDL_WM_SetCaption(title: PChar; icon: PChar); cdecl; external SDLLibName;
function  SDL_WM_ToggleFullScreen(surface: PSDL_Surface): LongInt; cdecl; external SDLLibName;

function  SDL_CreateMutex: PSDL_mutex; cdecl; external SDLLibName;
procedure SDL_DestroyMutex(mutex: PSDL_mutex); cdecl; external SDLLibName;
function  SDL_LockMutex(mutex: PSDL_mutex): LongInt; cdecl; external SDLLibName name 'SDL_mutexP';
function  SDL_UnlockMutex(mutex: PSDL_mutex): LongInt; cdecl; external SDLLibName name 'SDL_mutexV';

function  SDL_GL_SetAttribute(attr: TSDL_GLattr; value: LongInt): LongInt; cdecl; external SDLLibName;
procedure SDL_GL_SwapBuffers(); cdecl; external SDLLibName;

function  SDL_NumJoysticks: LongInt; cdecl; external SDLLibName;
function  SDL_JoystickName(idx: LongInt): PChar; cdecl; external SDLLibName;
function  SDL_JoystickOpen(idx: LongInt): PSDL_Joystick; cdecl; external SDLLibName;
function  SDL_JoystickOpened(idx: LongInt): LongInt; cdecl; external SDLLibName;
function  SDL_JoystickIndex(joy: PSDL_Joystick): LongInt; cdecl; external SDLLibName;
function  SDL_JoystickNumAxes(joy: PSDL_Joystick): LongInt; cdecl; external SDLLibName;
function  SDL_JoystickNumBalls(joy: PSDL_Joystick): LongInt; cdecl; external SDLLibName;
function  SDL_JoystickNumHats(joy: PSDL_Joystick): LongInt; cdecl; external SDLLibName;
function  SDL_JoystickNumButtons(joy: PSDL_Joystick): LongInt; cdecl; external SDLLibName;
procedure SDL_JoystickUpdate; cdecl; external SDLLibName;
function  SDL_JoystickEventState(state: LongInt): LongInt; cdecl; external SDLLibName;
function  SDL_JoystickGetAxis(joy: PSDL_Joystick; axis: LongInt): LongInt; cdecl; external SDLLibName;
function  SDL_JoystickGetBall(joy: PSDL_Joystick; ball: LongInt; dx: PInteger; dy: PInteger): Word; cdecl; external SDLLibName;
function  SDL_JoystickGetHat(joy: PSDL_Joystick; hat: LongInt): Byte; cdecl; external SDLLibName;
function  SDL_JoystickGetButton(joy: PSDL_Joystick; button: LongInt): Byte; cdecl; external SDLLibName;
procedure SDL_JoystickClose(joy: PSDL_Joystick); cdecl; external SDLLibName;

function SDL_putenv(const text: PChar): LongInt; cdecl; external SDLLibName;
function SDL_getenv(const text: PChar): PChar; cdecl; external SDLLibName;

(*  SDL_TTF  *)
function  TTF_Init: LongInt; cdecl; external SDL_TTFLibName;
procedure TTF_Quit; cdecl; external SDL_TTFLibName;

function  TTF_SizeUTF8(font: PTTF_Font; const text: PChar; var w, h: LongInt): LongInt; cdecl; external SDL_TTFLibName;

function  TTF_RenderUTF8_Solid(font: PTTF_Font; const text: PChar; fg: TSDL_Color): PSDL_Surface; cdecl; external SDL_TTFLibName;
function  TTF_RenderUTF8_Blended(font: PTTF_Font; const text: PChar; fg: TSDL_Color): PSDL_Surface; cdecl; external SDL_TTFLibName;
function  TTF_RenderUTF8_Shaded(font: PTTF_Font; const text: PChar; fg, bg: TSDL_Color): PSDL_Surface; cdecl; external SDL_TTFLibName;

function  TTF_OpenFont(const filename: PChar; size: LongInt): PTTF_Font; cdecl; external SDL_TTFLibName;
procedure TTF_SetFontStyle(font: PTTF_Font; style: LongInt); cdecl; external SDL_TTFLibName;

(*  SDL_mixer  *)
function  Mix_Init(flags: LongInt): LongInt; cdecl; external SDL_MixerLibName;
procedure Mix_Quit; cdecl; external SDL_MixerLibName;

function  Mix_OpenAudio(frequency: LongInt; format: Word; channels: LongInt; chunksize: LongInt): LongInt; cdecl; external SDL_MixerLibName;
procedure Mix_CloseAudio; cdecl; external SDL_MixerLibName;

function  Mix_Volume(channel: LongInt; volume: LongInt): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_SetDistance(channel: LongInt; distance: Byte): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_VolumeMusic(volume: LongInt): LongInt; cdecl; external SDL_MixerLibName;

function  Mix_AllocateChannels(numchans: LongInt): LongInt; cdecl; external SDL_MixerLibName;
procedure Mix_FreeChunk(chunk: PMixChunk); cdecl; external SDL_MixerLibName;
procedure Mix_FreeMusic(music: PMixMusic); cdecl; external SDL_MixerLibName;

function  Mix_LoadWAV_RW(src: PSDL_RWops; freesrc: LongInt): PMixChunk; cdecl; external SDL_MixerLibName;
function  Mix_LoadMUS(const filename: PChar): PMixMusic; cdecl; external SDL_MixerLibName;

function  Mix_Playing(channel: LongInt): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_PlayingMusic: LongInt; cdecl; external SDL_MixerLibName;
function  Mix_FadeInMusic(music: PMixMusic; loops: LongInt; ms: LongInt): LongInt; cdecl; external SDL_MixerLibName;

function  Mix_PlayChannelTimed(channel: LongInt; chunk: PMixChunk; loops: LongInt; ticks: LongInt): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_PlayMusic(music: PMixMusic; loops: LongInt): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_PausedMusic(music: PMixMusic): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_PauseMusic(music: PMixMusic): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_ResumeMusic(music: PMixMusic): LongInt; cdecl; external SDL_MixerLibName;
function  Mix_HaltChannel(channel: LongInt): LongInt; cdecl; external SDL_MixerLibName;

(*  SDL_image  *)
function  IMG_Init(flags: LongInt): LongInt; cdecl; external SDL_ImageLibName;
procedure IMG_Quit; cdecl; external SDL_ImageLibName;

function  IMG_Load(const _file: PChar): PSDL_Surface; cdecl; external SDL_ImageLibName;
function  IMG_Load_RW(rwop: PSDL_RWops; freesrc: LongInt): PSDL_Surface; cdecl; external SDL_ImageLibName;
function  IMG_LoadPNG_RW(rwop: PSDL_RWops): PSDL_Surface; cdecl; external SDL_ImageLibName;
function  IMG_LoadTyped_RW(rwop: PSDL_RWops; freesrc: LongInt; _type: PChar): PSDL_Surface; cdecl; external SDL_ImageLibName;

(*  SDL_net  *)
function  SDLNet_Init: LongInt; cdecl; external SDL_NetLibName;
procedure SDLNet_Quit; cdecl; external SDL_NetLibName;

function  SDLNet_AllocSocketSet(maxsockets: LongInt): PSDLNet_SocketSet; cdecl; external SDL_NetLibName;
function  SDLNet_ResolveHost(var address: TIPaddress; host: PChar; port: Word): LongInt; cdecl; external SDL_NetLibName;
function  SDLNet_TCP_Accept(server: PTCPsocket): PTCPSocket; cdecl; external SDL_NetLibName;
function  SDLNet_TCP_Open(var ip: TIPaddress): PTCPSocket; cdecl; external SDL_NetLibName;
function  SDLNet_TCP_Send(sock: PTCPsocket; data: Pointer; len: LongInt): LongInt; cdecl; external SDL_NetLibName;
function  SDLNet_TCP_Recv(sock: PTCPsocket; data: Pointer; len: LongInt): LongInt; cdecl; external SDL_NetLibName;
procedure SDLNet_TCP_Close(sock: PTCPsocket); cdecl; external SDL_NetLibName;
procedure SDLNet_FreeSocketSet(_set: PSDLNet_SocketSet); cdecl; external SDL_NetLibName;
function  SDLNet_AddSocket(_set: PSDLNet_SocketSet; sock: PTCPSocket): LongInt; cdecl; external SDL_NetLibName;
function  SDLNet_CheckSockets(_set: PSDLNet_SocketSet; timeout: LongInt): LongInt; cdecl; external SDL_NetLibName;


procedure SDLNet_Write16(value: Word; buf: pointer);
procedure SDLNet_Write32(value: LongWord; buf: pointer);
function  SDLNet_Read16(buf: pointer): Word;
function  SDLNet_Read32(buf: pointer): LongWord;
implementation

function SDL_MustLock(Surface: PSDL_Surface): Boolean;
begin
    SDL_MustLock:= ( surface^.offset <> 0 ) or (( surface^.flags and (SDL_HWSURFACE or SDL_ASYNCBLIT or SDL_RLEACCEL)) <> 0)
end;

procedure SDLNet_Write16(value: Word; buf: pointer);
begin
    PByteArray(buf)^[1]:= value;
    PByteArray(buf)^[0]:= value shr 8
end;

procedure SDLNet_Write32(value: LongWord; buf: pointer);
begin
    PByteArray(buf)^[3]:= value;
    PByteArray(buf)^[2]:= value shr  8;
    PByteArray(buf)^[1]:= value shr 16;
    PByteArray(buf)^[0]:= value shr 24
end;

function SDLNet_Read16(buf: pointer): Word;
begin
    SDLNet_Read16:= PByteArray(buf)^[1] or
                 (PByteArray(buf)^[0] shl 8)
end;

function SDLNet_Read32(buf: pointer): LongWord;
begin
    SDLNet_Read32:=  PByteArray(buf)^[3] or
                  (PByteArray(buf)^[2] shl  8) or
                  (PByteArray(buf)^[1] shl 16) or
                  (PByteArray(buf)^[0] shl 24)
end;

{$IFDEF SDL13}
function SDL_RenderFill(rect: PSDL_Rect): LongInt;
var res: LongInt;
begin
    if (rect <> nil) then res:= SDL_RenderFillRect(rect)
    else res:= SDL_RenderClear();
    exit(res);
end;
{$ENDIF}

end.