(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2005, 2007 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

 *)

unit uSound;

interface

uses SDLh, uConsts;

{$INCLUDE options.inc}

procedure InitSound;

procedure ReleaseSound;

procedure SoundLoad;

procedure PlaySound(snd: TSound; infinite: boolean);

procedure PlayMusic;

procedure StopSound(snd: TSound);

function  ChangeVolume(voldelta: LongInt): LongInt;

procedure InitPlaylistChunk(seed: LongWord);

implementation

uses uMisc, uConsole;

{$INCLUDE playlist.inc}

const chanTPU = 12;

var Mus: PMixMusic = nil;

    CurrMusic: Longword = 0;

    Volume: LongInt;

procedure InitSound;

begin

if not isSoundEnabled then exit;

WriteToConsole('Init sound...');

isSoundEnabled:= SDL_Init(SDL_INIT_AUDIO) >= 0;

if isSoundEnabled then

   isSoundEnabled:= Mix_OpenAudio(22050, $8010, 2, 512) = 0;

if isSoundEnabled then WriteLnToConsole(msgOK)

                  else WriteLnToConsole(msgFailed);

Mix_AllocateChannels(Succ(chanTPU));

Mix_VolumeMusic(48);

Volume:= cInitVolume;

if Volume < 0 then Volume:= 0;

Volume:= Mix_Volume(-1, Volume)

end;

procedure ReleaseSound;

var i: TSound;

begin

for i:= Low(TSound) to High(TSound) do

    Mix_FreeChunk(Soundz[i].id);

Mix_FreeMusic(Mus);

Mix_CloseAudio

end;

procedure SoundLoad;

var i: TSound;

    s: shortstring;

begin

if not isSoundEnabled then exit;

for i:= Low(TSound) to High(TSound) do

    begin

    s:= Pathz[Soundz[i].Path] + '/' + Soundz[i].FileName;

    WriteToConsole(msgLoading + s + ' ');

    Soundz[i].id:= Mix_LoadWAV_RW(SDL_RWFromFile(Str2PChar(s), 'rb'), 1);

    TryDo(Soundz[i].id <> nil, msgFailed, true);

    WriteLnToConsole(msgOK);

    end;

end;

procedure PlaySound(snd: TSound; infinite: boolean);

var loops: LongInt;

begin

if not isSoundEnabled then exit;

if infinite then loops:= -1 else loops:= 0;

Soundz[snd].lastChan:= Mix_PlayChannelTimed(-1, Soundz[snd].id, loops, -1)

end;

procedure StopSound(snd: TSound);

begin

if not isSoundEnabled then exit;

if Mix_Playing(Soundz[snd].lastChan) <> 0 then

   Mix_HaltChannel(Soundz[snd].lastChan)

end;

procedure PlayMusic;

var s: string;

begin

{$IFDEF HAVE_MUSIC}

if not isSoundEnabled then exit;

if Mix_PlayingMusic() <> 0 then exit;

Mix_FreeMusic(Mus);

CurrMusic:= playlistchain[CurrMusic];

s:= PathPrefix + '/Music/' + playlist[CurrMusic];

WriteToConsole(msgLoading + s + ' ');

Mus:= Mix_LoadMUS(Str2PChar(s));

TryDo(Mus <> nil, msgFailed, false);

WriteLnToConsole(msgOK);

Mix_PlayMusic(Mus, 1)

{$ENDIF}

end;

function ChangeVolume(voldelta: LongInt): LongInt;

begin

if not isSoundEnabled then

   exit(0);

inc(Volume, voldelta);

if Volume < 0 then Volume:= 0;

Mix_Volume(-1, Volume);

Volume:= Mix_Volume(-1, -1);

Mix_VolumeMusic(Volume * 3 div 8);

ChangeVolume:= Volume * 100 div MIX_MAX_VOLUME

end;

procedure InitPlaylistChunk(seed: LongWord);

var i, t, nt: Longword;

begin

{$IFDEF HAVE_MUSIC}

for i:= 0 to Pred(cPlayListLength) do

    playlistchain[i]:= 0;

t:= 0;

for i:= 0 to cPlayListLength - 2 do

    begin

    repeat

      seed:= seed * 1664525 + 1013904223;

      nt:= seed mod cPlayListLength;

    until (t <> nt) and (playlistchain[nt] = 0);

    playlistchain[t]:= nt;

    t:= nt;

    end

{$ENDIF}

end;

end.