hedgewars/uSound.pas
author unc0rr
Sun, 27 Jul 2008 22:09:40 +0000
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child 1137 58cd4277382e
permissions -rw-r--r--
Add an option to engine for turning music off
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2005, 2007 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 *)
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unit uSound;
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interface
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uses SDLh, uConsts;
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{$INCLUDE options.inc}
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procedure InitSound;
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procedure ReleaseSound;
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procedure SoundLoad;
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procedure PlaySound(snd: TSound; infinite: boolean);
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procedure PlayMusic;
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procedure StopSound(snd: TSound);
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function  ChangeVolume(voldelta: LongInt): LongInt;
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var MusicFN: shortstring = '';
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implementation
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uses uMisc, uConsole;
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const chanTPU = 12;
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var Mus: PMixMusic = nil;
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    Volume: LongInt;
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procedure InitSound;
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begin
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if not isSoundEnabled then exit;
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WriteToConsole('Init sound...');
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isSoundEnabled:= SDL_Init(SDL_INIT_AUDIO) >= 0;
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if isSoundEnabled then
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   isSoundEnabled:= Mix_OpenAudio(22050, $8010, 2, 512) = 0;
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if isSoundEnabled then WriteLnToConsole(msgOK)
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                  else WriteLnToConsole(msgFailed);
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Mix_AllocateChannels(Succ(chanTPU));
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if isMusicEnabled then Mix_VolumeMusic(64);
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Volume:= cInitVolume;
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if Volume < 0 then Volume:= 0;
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Volume:= Mix_Volume(-1, Volume)
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end;
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procedure ReleaseSound;
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var i: TSound;
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begin
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for i:= Low(TSound) to High(TSound) do
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	Mix_FreeChunk(Soundz[i].id);
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Mix_FreeMusic(Mus);
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Mix_CloseAudio
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end;
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procedure SoundLoad;
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var i: TSound;
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    s: shortstring;
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begin
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if not isSoundEnabled then exit;
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for i:= Low(TSound) to High(TSound) do
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    begin
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    s:= Pathz[Soundz[i].Path] + '/' + Soundz[i].FileName;
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    WriteToConsole(msgLoading + s + ' ');
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    Soundz[i].id:= Mix_LoadWAV_RW(SDL_RWFromFile(Str2PChar(s), 'rb'), 1);
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    TryDo(Soundz[i].id <> nil, msgFailed, true);
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    WriteLnToConsole(msgOK);
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    end;
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end;
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procedure PlaySound(snd: TSound; infinite: boolean);
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var loops: LongInt;
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begin
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if not isSoundEnabled then exit;
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if infinite then loops:= -1 else loops:= 0;
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Soundz[snd].lastChan:= Mix_PlayChannelTimed(-1, Soundz[snd].id, loops, -1)
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end;
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procedure StopSound(snd: TSound);
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begin
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if not isSoundEnabled then exit;
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if Mix_Playing(Soundz[snd].lastChan) <> 0 then
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   Mix_HaltChannel(Soundz[snd].lastChan)
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end;
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procedure PlayMusic;
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var s: string;
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begin
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if (not isSoundEnabled)
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	or (MusicFN = '')
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	or (not isMusicEnabled)then exit;
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s:= PathPrefix + '/Music/' + MusicFN;
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WriteToConsole(msgLoading + s + ' ');
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Mus:= Mix_LoadMUS(Str2PChar(s));
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TryDo(Mus <> nil, msgFailed, false);
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WriteLnToConsole(msgOK);
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Mix_PlayMusic(Mus, -1)
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end;
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function ChangeVolume(voldelta: LongInt): LongInt;
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begin
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if not isSoundEnabled then
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   exit(0);
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inc(Volume, voldelta);
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if Volume < 0 then Volume:= 0;
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Mix_Volume(-1, Volume);
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Volume:= Mix_Volume(-1, -1);
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if isMusicEnabled then Mix_VolumeMusic(Volume * 5 div 8);
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ChangeVolume:= Volume * 100 div MIX_MAX_VOLUME
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end;
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end.