(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2011 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 uSound;

(*

 * This unit controls the sounds and music of the game.

 * Doesn't really do anything if isSoundEnabled = false.

 *

 * There are three basic types of sound controls:

 *    Music        - The background music of the game:

 *                   * will only be played if isMusicEnabled = true

 *                   * can be started, changed, paused and resumed

 *    Sound        - Can be started and stopped

 *    Looped Sound - Subtype of sound: plays in a loop using a

 *                   "channel", of which the id is returned on start.

 *                   The channel id can be used to stop a specific sound loop.

 *)

interface

uses SDLh, uConsts, uTypes, sysutils;

var MusicFN: shortstring; // music file name

procedure initModule;

procedure freeModule;

procedure InitSound; // Initiates sound-system if isSoundEnabled.

procedure ReleaseSound; // Releases sound-system and used resources.

procedure SoundLoad; // Preloads some sounds for performance reasons.

// MUSIC

// Obvious music commands for music track specified in MusicFN.

procedure PlayMusic;

procedure PauseMusic;

procedure ResumeMusic;

procedure ChangeMusic; // Replaces music track with current MusicFN and plays it.

// SOUNDS

// Plays the sound snd [from a given voicepack],

// if keepPlaying is given and true,

// then the sound's playback won't be interrupted if asked to play again.

procedure PlaySound(snd: TSound);

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

procedure PlaySound(snd: TSound; voicepack: PVoicepack);

procedure PlaySound(snd: TSound; voicepack: PVoicepack; keepPlaying: boolean);

// Plays sound snd [of voicepack] in a loop, but starts with fadems milliseconds of fade-in.

// Returns sound channel of the looped sound.

function  LoopSound(snd: TSound): LongInt;

function  LoopSound(snd: TSound; fadems: LongInt): LongInt;

function  LoopSound(snd: TSound; voicepack: PVoicepack): LongInt; // WTF?

function  LoopSound(snd: TSound; voicepack: PVoicepack; fadems: LongInt): LongInt;

// Stops the normal/looped sound of the given type/in the given channel

// [with a fade-out effect for fadems milliseconds].

procedure StopSound(snd: TSound);

procedure StopSound(chn: LongInt);

procedure StopSound(chn, fadems: LongInt);

// MISC

// Modifies the sound volume of the game by voldelta and returns the new volume level.

function  ChangeVolume(voldelta: LongInt): LongInt;

// Returns a pointer to the voicepack with the given name.

function  AskForVoicepack(name: shortstring): Pointer;

implementation

uses uVariables, uConsole, uUtils, uCommands, uDebug;

const chanTPU = 32;

var Volume: LongInt;

    lastChan: array [TSound] of LongInt;

    voicepacks: array[0..cMaxTeams] of TVoicepack;

    defVoicepack: PVoicepack;

    Mus: PMixMusic = nil;

function  AskForVoicepack(name: shortstring): Pointer;

var i: Longword;

    locName, path: shortstring;

begin

i:= 0;

    // First, attempt to locate a localised version of the voice

    if cLocale <> 'en' then

        begin

        locName:= name+'_'+cLocale;

        if DirectoryExists(path) then name:= locName

            begin

            path:= Pathz[ptVoices] + '/' + locName;

            if DirectoryExists(path) then name:= locName

            end

        end;

    // If that fails, use the unmodified one

    while (voicepacks[i].name <> name) and (voicepacks[i].name <> '') do

        begin

        inc(i);

        TryDo(i <= cMaxTeams, 'Engine bug: AskForVoicepack i > cMaxTeams', true)

        end;

    voicepacks[i].name:= name;

    AskForVoicepack:= @voicepacks[i]

end;

procedure InitSound;

var i: TSound;

    channels: LongInt;

begin

    if not isSoundEnabled then exit;

    WriteToConsole('Init sound...');

    isSoundEnabled:= SDL_InitSubSystem(SDL_INIT_AUDIO) >= 0;

{$IFDEF IPHONEOS}

    channels:= 1;

{$ELSE}

    channels:= 2;

{$ENDIF}

    if isSoundEnabled then

        isSoundEnabled:= Mix_OpenAudio(44100, $8010, channels, 1024) = 0;

{$IFDEF SDL_MIXER_NEWER}

    WriteToConsole('Init SDL_mixer... ');

    SDLTry(Mix_Init(MIX_INIT_OGG) <> 0, true);

    WriteLnToConsole(msgOK);

{$ENDIF}

    if isSoundEnabled then

        WriteLnToConsole(msgOK)

    else

        WriteLnToConsole(msgFailed);

    Mix_AllocateChannels(Succ(chanTPU));

    if isMusicEnabled then

        Mix_VolumeMusic(50);

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

        lastChan[i]:= -1;

    Volume:= 0;

    ChangeVolume(cInitVolume)

end;

procedure ReleaseSound;

var i: TSound;

    t: Longword;

begin

    for t:= 0 to cMaxTeams do

        if voicepacks[t].name <> '' then

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

                if voicepacks[t].chunks[i] <> nil then

                    Mix_FreeChunk(voicepacks[t].chunks[i]);

    if Mus <> nil then

        Mix_FreeMusic(Mus);

{$IFDEF SDL_MIXER_NEWER}

    // make sure all instances of sdl_mixer are unloaded before continuing

    while Mix_Init(0) <> 0 do

        Mix_Quit();

{$ENDIF}

    Mix_CloseAudio();

end;

procedure SoundLoad;

var i: TSound;

    t: Longword;

    s:shortstring;

begin

    if not isSoundEnabled then exit;

    defVoicepack:= AskForVoicepack('Default');

    for t:= 0 to cMaxTeams do

        if voicepacks[t].name <> '' then

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

                voicepacks[t].chunks[i]:= nil;

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

    begin

        defVoicepack^.chunks[i]:= nil;

        // preload all the big sound files (>32k) that would otherwise lockup the game

        if (i in [sndBeeWater, sndBee, sndCake, sndHellishImpact1, sndHellish, sndHomerun,

                  sndMolotov, sndMortar, sndRideOfTheValkyries, sndYoohoo])

            and (Soundz[i].Path <> ptVoices) and (Soundz[i].FileName <> '') then

        begin

            WriteToConsole(msgLoading + s + ' ');

            defVoicepack^.chunks[i]:= Mix_LoadWAV_RW(SDL_RWFromFile(Str2PChar(s), 'rb'), 1);

            TryDo(defVoicepack^.chunks[i] <> nil, msgFailed, true);

            WriteLnToConsole(msgOK);

        end;

    end;

end;

procedure PlaySound(snd: TSound);

begin

    PlaySound(snd, nil, false);

end;

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

begin

    PlaySound(snd, nil, keepPlaying);

end;

procedure PlaySound(snd: TSound; voicepack: PVoicepack);

begin

    PlaySound(snd, voicepack, false);

end;

procedure PlaySound(snd: TSound; voicepack: PVoicepack; keepPlaying: boolean);

var s:shortstring;

begin

    if (not isSoundEnabled) or fastUntilLag then

        exit;

    if keepPlaying and (lastChan[snd] <> -1) and (Mix_Playing(lastChan[snd]) <> 0) then

        exit;

    if (voicepack <> nil) then

    begin

        if (voicepack^.chunks[snd] = nil) and (Soundz[snd].Path = ptVoices) and (Soundz[snd].FileName <> '') then

        begin

            WriteToConsole(msgLoading + s + ' ');

            voicepack^.chunks[snd]:= Mix_LoadWAV_RW(SDL_RWFromFile(Str2PChar(s), 'rb'), 1);

            if voicepack^.chunks[snd] = nil then

                WriteLnToConsole(msgFailed)

            else

                WriteLnToConsole(msgOK)

        end;

        lastChan[snd]:= Mix_PlayChannelTimed(-1, voicepack^.chunks[snd], 0, -1)

    end

    else

    begin

        if (defVoicepack^.chunks[snd] = nil) and (Soundz[snd].Path <> ptVoices) and (Soundz[snd].FileName <> '') then

        begin

            WriteToConsole(msgLoading + s + ' ');

            defVoicepack^.chunks[snd]:= Mix_LoadWAV_RW(SDL_RWFromFile(Str2PChar(s), 'rb'), 1);

            TryDo(defVoicepack^.chunks[snd] <> nil, msgFailed, true);

            WriteLnToConsole(msgOK);

        end;

        lastChan[snd]:= Mix_PlayChannelTimed(-1, defVoicepack^.chunks[snd], 0, -1)

    end;

end;

function LoopSound(snd: TSound): LongInt;

begin

    LoopSound:= LoopSound(snd, nil)

end;

function LoopSound(snd: TSound; fadems: LongInt): LongInt;

begin

    LoopSound:= LoopSound(snd, nil, fadems)

end;

function LoopSound(snd: TSound; voicepack: PVoicepack): LongInt;

begin

    voicepack:= voicepack;    // avoid compiler hint

    LoopSound:= LoopSound(snd, nil, 0)

end;

function LoopSound(snd: TSound; voicepack: PVoicepack; fadems: LongInt): LongInt;

var s: shortstring;

begin

    if (not isSoundEnabled) or fastUntilLag then

    begin

        LoopSound:= -1;

        exit

    end;

    if (voicepack <> nil) then

    begin

        if (voicepack^.chunks[snd] = nil) and (Soundz[snd].Path = ptVoices) and (Soundz[snd].FileName <> '') then

        begin

            WriteToConsole(msgLoading + s + ' ');

            voicepack^.chunks[snd]:= Mix_LoadWAV_RW(SDL_RWFromFile(Str2PChar(s), 'rb'), 1);

            if voicepack^.chunks[snd] = nil then

                WriteLnToConsole(msgFailed)

            else

                WriteLnToConsole(msgOK)

        end;

        LoopSound:= Mix_PlayChannelTimed(-1, voicepack^.chunks[snd], -1, -1)

    end

    else

    begin

        if (defVoicepack^.chunks[snd] = nil) and (Soundz[snd].Path <> ptVoices) and (Soundz[snd].FileName <> '') then

        begin

            WriteToConsole(msgLoading + s + ' ');

            defVoicepack^.chunks[snd]:= Mix_LoadWAV_RW(SDL_RWFromFile(Str2PChar(s), 'rb'), 1);

            TryDo(defVoicepack^.chunks[snd] <> nil, msgFailed, true);

            WriteLnToConsole(msgOK);

        end;

        if fadems > 0 then

            LoopSound:= Mix_FadeInChannelTimed(-1, defVoicepack^.chunks[snd], -1, fadems, -1)

        else

            LoopSound:= Mix_PlayChannelTimed(-1, defVoicepack^.chunks[snd], -1, -1);

    end;

end;

procedure StopSound(snd: TSound);

begin

    if not isSoundEnabled then exit;

    if (lastChan[snd] <> -1) and (Mix_Playing(lastChan[snd]) <> 0) then

    begin

        Mix_HaltChannel(lastChan[snd]);

        lastChan[snd]:= -1;

    end;

end;

procedure StopSound(chn: LongInt);

begin

    if not isSoundEnabled then exit;

    if (chn <> -1) and (Mix_Playing(chn) <> 0) then

        Mix_HaltChannel(chn);

end;

procedure StopSound(chn, fadems: LongInt);

begin

    if not isSoundEnabled then exit;

    if (chn <> -1) and (Mix_Playing(chn) <> 0) then

        Mix_FadeOutChannel(chn, fadems);

end;

procedure PlayMusic;

var s: shortstring;

begin

    if (not isSoundEnabled) or (MusicFN = '') or (not isMusicEnabled) then

        exit;

    WriteToConsole(msgLoading + s + ' ');

    Mus:= Mix_LoadMUS(Str2PChar(s));

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

    WriteLnToConsole(msgOK);

    SDLTry(Mix_FadeInMusic(Mus, -1, 3000) <> -1, false)

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);

    if isMusicEnabled then Mix_VolumeMusic(Volume * 4 div 8);

    ChangeVolume:= Volume * 100 div MIX_MAX_VOLUME

end;

procedure PauseMusic;

begin

    if (MusicFN = '') or (not isMusicEnabled) then

        exit;

    Mix_PauseMusic(Mus);

end;

procedure ResumeMusic;

begin

    if (MusicFN = '') or (not isMusicEnabled) then

        exit;

    Mix_ResumeMusic(Mus);

end;

procedure ChangeMusic;

begin

    if (MusicFN = '') or (not isMusicEnabled) then

        exit;

    // get rid of current music

    if Mus <> nil then

        Mix_FreeMusic(Mus);

    PlayMusic;

end;

procedure chVoicepack(var s: shortstring);

begin

    if CurrentTeam = nil then OutError(errmsgIncorrectUse + ' "/voicepack"', true);

    if s[1]='"' then Delete(s, 1, 1);

    if s[byte(s[0])]='"' then Delete(s, byte(s[0]), 1);

    CurrentTeam^.voicepack:= AskForVoicepack(s)

end;

procedure initModule;

begin

    RegisterVariable('voicepack', vtCommand, @chVoicepack, false);

    MusicFN:='';

end;

procedure freeModule;

begin

    if isSoundEnabled then

        ReleaseSound();

end;

end.