/**
 * vim: set ts=4 :
 * =============================================================================
 * SourceMod (C)2004-2008 AlliedModders LLC.  All rights reserved.
 * =============================================================================
 *
 * This file is part of the SourceMod/SourcePawn SDK.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 3.0, as published by the
 * Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, AlliedModders LLC gives you permission to link the
 * code of this program (as well as its derivative works) to "Half-Life 2," the
 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
 * by the Valve Corporation.  You must obey the GNU General Public License in
 * all respects for all other code used.  Additionally, AlliedModders LLC grants
 * this exception to all derivative works.  AlliedModders LLC defines further
 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
 * or <http://www.sourcemod.net/license.php>.
 *
 * Version: $Id$
 */

#if defined _sdktools_sound_included
 #endinput
#endif
#define _sdktools_sound_included

/**
 * Sound should be from the target client.
 */
#define SOUND_FROM_PLAYER       -2

/**
 * Sound should be from the listen server player.
 */
#define SOUND_FROM_LOCAL_PLAYER -1

/**
 * Sound is from the world.
 */
#define SOUND_FROM_WORLD        0

/**
 * Sound channels.
 */
enum
{
	SNDCHAN_REPLACE = -1,       /**< Unknown */
	SNDCHAN_AUTO = 0,           /**< Auto */
	SNDCHAN_WEAPON = 1,         /**< Weapons */
	SNDCHAN_VOICE = 2,          /**< Voices */
	SNDCHAN_ITEM = 3,           /**< Items */
	SNDCHAN_BODY = 4,           /**< Player? */
	SNDCHAN_STREAM = 5,         /**< "Stream channel from the static or dynamic area" */
	SNDCHAN_STATIC = 6,         /**< "Stream channel from the static area" */
	SNDCHAN_VOICE_BASE = 7,     /**< "Channel for network voice data" */
	SNDCHAN_USER_BASE = 135     /**< Anything >= this is allocated to game code */
};

/**
 * Sound flags for the sound emitter system.
 */
enum
{
	SND_NOFLAGS = 0,                                         /** Nothing */
	SND_CHANGEVOL = (1 << 0),                                /** Change sound volume */
	SND_CHANGEPITCH = (1 << 1),                              /** Change sound pitch */
	SND_STOP = (1 << 2),                                     /** Stop the sound */
	SND_SPAWNING = (1 << 3),                                 /** Used in some cases for ambients */
	SND_DELAY = (1 << 4),                                    /** Sound has an initial delay */
	SND_STOPLOOPING = (1 << 5),                              /** Stop looping all sounds on the entity */
	SND_SPEAKER = (1 << 6),                                  /** Being played by a mic through a speaker */
	SND_SHOULDPAUSE = (1 << 7),                              /** Pause if game is paused */
	SND_IGNORE_PHONEMES = (1 << 8),                          /** Prevents flex animation from being driven by this sound */
	SND_IGNORE_NAME = (1 << 9),                              /** Changes all sounds emitted on the entity, regardless of actual name */
	SND_DO_NOT_OVERWRITE_EXISTING_ON_CHANNEL = (1 << 10)     /** If an existing sound is found on the channel, the sound will not play instead of overwriting it */
};

/**
 * Various predefined sound levels in dB.
 */
enum
{
	SNDLEVEL_NONE = 0,          /**< None */
	SNDLEVEL_RUSTLE = 20,       /**< Rustling leaves */
	SNDLEVEL_WHISPER = 25,      /**< Whispering */
	SNDLEVEL_LIBRARY = 30,      /**< In a library */
	SNDLEVEL_FRIDGE = 45,       /**< Refrigerator */
	SNDLEVEL_HOME = 50,         /**< Average home (3.9 attn) */
	SNDLEVEL_CONVO = 60,        /**< Normal conversation (2.0 attn) */
	SNDLEVEL_DRYER = 60,        /**< Clothes dryer */
	SNDLEVEL_DISHWASHER = 65,   /**< Dishwasher/washing machine (1.5 attn) */
	SNDLEVEL_CAR = 70,          /**< Car or vacuum cleaner (1.0 attn) */
	SNDLEVEL_NORMAL = 75,       /**< Normal sound level */
	SNDLEVEL_TRAFFIC = 75,      /**< Busy traffic (0.8 attn) */
	SNDLEVEL_MINIBIKE = 80,     /**< Mini-bike, alarm clock (0.7 attn) */
	SNDLEVEL_SCREAMING = 90,    /**< Screaming child (0.5 attn) */
	SNDLEVEL_TRAIN = 100,       /**< Subway train, pneumatic drill (0.4 attn) */
	SNDLEVEL_HELICOPTER = 105,  /**< Helicopter */
	SNDLEVEL_SNOWMOBILE = 110,  /**< Snow mobile */
	SNDLEVEL_AIRCRAFT = 120,    /**< Auto horn, aircraft */
	SNDLEVEL_RAIDSIREN = 130,   /**< Air raid siren */
	SNDLEVEL_GUNFIRE = 140,     /**< Gunshot, jet engine (0.27 attn) */
	SNDLEVEL_ROCKET = 180       /**< Rocket launching (0.2 attn) */
};

#define SNDVOL_NORMAL       1.0     /**< Normal volume */
#define SNDPITCH_NORMAL     100     /**< Normal pitch */
#define SNDPITCH_LOW        95      /**< A low pitch */
#define SNDPITCH_HIGH       120     /**< A high pitch */
#define SNDATTN_NONE        0.0     /**< No attenuation */
#define SNDATTN_NORMAL      0.8     /**< Normal attenuation */
#define SNDATTN_STATIC      1.25    /**< Static attenuation? */
#define SNDATTN_RICOCHET    1.5     /**< Ricochet effect */
#define SNDATTN_IDLE        2.0     /**< Idle attenuation? */

/**
 * Prefetches a sound.
 *
 * @param name          Sound file name relative to the "sound" folder.
 */
native void PrefetchSound(const char[] name);

/**
 * This function is not known to work, and may crash.  You should
 * not use it.  It is provided for backwards compatibility only.
 *
 * @param name          Sound file name relative to the "sound" folder.
 * @return              Duration in seconds.
 * @deprecated          Does not work, may crash.
 */
#pragma deprecated Does not work, may crash.
native float GetSoundDuration(const char[] name);

/**
 * Emits an ambient sound.
 *
 * @param name          Sound file name relative to the "sound" folder.
 * @param pos           Origin of sound.
 * @param entity        Entity index to associate sound with.
 * @param level         Sound level (from 0 to 255).
 * @param flags         Sound flags.
 * @param vol           Volume (from 0.0 to 1.0).
 * @param pitch         Pitch (from 0 to 255).
 * @param delay         Play delay.
 */
native void EmitAmbientSound(const char[] name,
						const float pos[3],
						int entity = SOUND_FROM_WORLD,
						int level = SNDLEVEL_NORMAL,
						int flags = SND_NOFLAGS,
						float vol = SNDVOL_NORMAL,
						int pitch = SNDPITCH_NORMAL,
						float delay = 0.0);

/**
 * Fades a client's volume level toward silence or a given percentage.
 *
 * @param client        Client index.
 * @param percent       Fade percentage.
 * @param outtime       Fade out time, in seconds.
 * @param holdtime      Hold time, in seconds.
 * @param intime        Fade in time, in seconds.
 * @error               Invalid client index or client not in game.
 */
native void FadeClientVolume(int client, float percent, float outtime, float holdtime, float intime);

/**
 * Stops a sound.
 *
 * @param entity        Entity index.
 * @param channel       Channel number.
 * @param name          Sound file name relative to the "sound" folder.
 */
native void StopSound(int entity, int channel, const char[] name);

/**
 * Emits a sound to a list of clients.
 *
 * @param clients       Array of client indexes.
 * @param numClients    Number of clients in the array.
 * @param sample        Sound file name relative to the "sound" folder.
 * @param entity        Entity to emit from.
 * @param channel       Channel to emit with.
 * @param level         Sound level.
 * @param flags         Sound flags.
 * @param volume        Sound volume.
 * @param pitch         Sound pitch.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @param ...           Optional list of Float[3] arrays to specify additional origins.
 * @error               Invalid client index or client not in game.
 */
native void EmitSound(const int[] clients,
				 int numClients,
				 const char[] sample,
				 int entity = SOUND_FROM_PLAYER,
				 int channel = SNDCHAN_AUTO,
				 int level = SNDLEVEL_NORMAL,
				 int flags = SND_NOFLAGS,
				 float volume = SNDVOL_NORMAL,
				 int pitch = SNDPITCH_NORMAL,
				 int speakerentity = -1,
				 const float origin[3] = NULL_VECTOR,
				 const float dir[3] = NULL_VECTOR,
				 bool updatePos = true,
				 float soundtime = 0.0,
				 any ...);

/**
 * Emits a sound or game sound to a list of clients using the latest version of the engine sound interface.
 * This native is only available in engines that are greater than or equal to Portal 2.
 *
 * @param clients       Array of client indexes.
 * @param numClients    Number of clients in the array.
 * @param soundEntry    Sound entry name.
 * @param sample        Sound file name relative to the "sound" folder.
 * @param entity        Entity to emit from.
 * @param channel       Channel to emit with.
 * @param level         Sound level.
 * @param seed          Sound seed.
 * @param flags         Sound flags.
 * @param volume        Sound volume.
 * @param pitch         Sound pitch.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @param ...           Optional list of Float[3] arrays to specify additional origins.
 * @error               Invalid client index, client not in game, or lack of mod support.
 */
native void EmitSoundEntry(const int[] clients,
				 int numClients,
				 const char[] soundEntry,
				 const char[] sample,
				 int entity = SOUND_FROM_PLAYER,
				 int channel = SNDCHAN_AUTO,
				 int level = SNDLEVEL_NORMAL,
				 int seed = 0,
				 int flags = SND_NOFLAGS,
				 float volume = SNDVOL_NORMAL,
				 int pitch = SNDPITCH_NORMAL,
				 int speakerentity = -1,
				 const float origin[3] = NULL_VECTOR,
				 const float dir[3] = NULL_VECTOR,
				 bool updatePos = true,
				 float soundtime = 0.0,
				 any ...);

/**
 * Emits a sentence to a list of clients.
 *
 * @param clients       Array of client indexes.
 * @param numClients    Number of clients in the array.
 * @param sentence      Sentence index (from PrecacheSentenceFile).
 * @param entity        Entity to emit from.
 * @param channel       Channel to emit with.
 * @param level         Sound level.
 * @param flags         Sound flags.
 * @param volume        Sound volume.
 * @param pitch         Sound pitch.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @param ...           Optional list of Float[3] arrays to specify additional origins.
 * @error               Invalid client index or client not in game.
 */
native void EmitSentence(const int[] clients,
				 int numClients,
				 int sentence,
				 int entity,
				 int channel = SNDCHAN_AUTO,
				 int level = SNDLEVEL_NORMAL,
				 int flags = SND_NOFLAGS,
				 float volume = SNDVOL_NORMAL,
				 int pitch = SNDPITCH_NORMAL,
				 int speakerentity = -1,
				 const float origin[3] = NULL_VECTOR,
				 const float dir[3] = NULL_VECTOR,
				 bool updatePos = true,
				 float soundtime = 0.0,
				 any ...);

/**
 * Calculates gain of sound on given distance with given sound level in decibel
 *
 * @param soundlevel    decibel of sound, like SNDLEVEL_NORMAL or integer value
 * @param distance      distance of sound to calculate, not meter or feet, but Source Engine`s normal Coordinate unit
 * @return              gain of sound. you can multiply this with original sound`s volume to calculate volume on given distance
 */
native float GetDistGainFromSoundLevel(int soundlevel, float distance);

/**
 * Called when an ambient sound is about to be emitted to one or more clients.
 *
 * NOTICE: all parameters can be overwritten to modify the default behavior.
 *
 * @param sample        Sound file name relative to the "sound" folder.
 * @param entity        Entity index associated to the sound.
 * @param volume        Volume (from 0.0 to 1.0).
 * @param level         Sound level (from 0 to 255).
 * @param pitch         Pitch (from 0 to 255).
 * @param pos           Origin of sound.
 * @param flags         Sound flags.
 * @param delay         Play delay.
 * @return              Plugin_Continue to allow the sound to be played, Plugin_Stop to block it,
 *                      Plugin_Changed when any parameter has been modified.
 */
typedef AmbientSHook = function Action (
  char sample[PLATFORM_MAX_PATH],
  int &entity,
  float &volume,
  int &level,
  int &pitch,
  float pos[3],
  int &flags,
  float &delay
);

typeset NormalSHook
{
	// Called when a sound is going to be emitted to one or more clients.
	// NOTICE: all params can be overwritten to modify the default behavior.
	//
	// @param clients       Array of client indexes.
	// @param numClients    Number of clients in the array (modify this value if you add/remove elements from the client array).
	// @param sample        Sound file name relative to the "sound" folder.
	// @param entity        Entity emitting the sound.
	// @param channel       Channel emitting the sound.
	// @param volume        Sound volume.
	// @param level         Sound level.
	// @param pitch         Sound pitch.
	// @param flags         Sound flags.
	// @param soundEntry    Game sound entry name. (Used in engines newer than Portal 2)
	// @param seed          Sound seed. (Used in engines newer than Portal 2)
	// @return              Plugin_Continue to allow the sound to be played, Plugin_Stop to block it,
	//                      Plugin_Changed when any parameter has been modified.
	function Action (int clients[MAXPLAYERS], int &numClients, char sample[PLATFORM_MAX_PATH],
	  int &entity, int &channel, float &volume, int &level, int &pitch, int &flags,
	  char soundEntry[PLATFORM_MAX_PATH], int &seed);

	// Deprecated. Use other prototype.
	function Action (int clients[64], int &numClients, char sample[PLATFORM_MAX_PATH],
	  int &entity, int &channel, float &volume, int &level, int &pitch, int &flags,
	  char soundEntry[PLATFORM_MAX_PATH], int &seed);

	// Deprecated. Use other prototype.
	function Action (int clients[64], int &numClients, char sample[PLATFORM_MAX_PATH],
	  int &entity, int &channel, float &volume, int &level, int &pitch, int &flags);
};

/**
 * Hooks all played ambient sounds.
 *
 * @param hook          Function to use as a hook.
 * @error               Invalid function hook.
 */
native void AddAmbientSoundHook(AmbientSHook hook);

/**
 * Hooks all played normal sounds.
 *
 * @param hook          Function to use as a hook.
 * @error               Invalid function hook.
 */
native void AddNormalSoundHook(NormalSHook hook);

/**
 * Unhooks all played ambient sounds.
 *
 * @param hook          Function used for the hook.
 * @error               Invalid function hook.
 */
native void RemoveAmbientSoundHook(AmbientSHook hook);

/**
 * Unhooks all played normal sounds.
 *
 * @param hook          Function used for the hook.
 * @error               Invalid function hook.
 */
native void RemoveNormalSoundHook(NormalSHook hook);

/**
 * Wrapper to emit sound to one client.
 *
 * @param client        Client index.
 * @param sample        Sound file name relative to the "sound" folder.
 * @param entity        Entity to emit from.
 * @param channel       Channel to emit with.
 * @param level         Sound level.
 * @param flags         Sound flags.
 * @param volume        Sound volume.
 * @param pitch         Sound pitch.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @error               Invalid client index or client not in game.
 */
stock void EmitSoundToClient(int client,
				 const char[] sample,
				 int entity = SOUND_FROM_PLAYER,
				 int channel = SNDCHAN_AUTO,
				 int level = SNDLEVEL_NORMAL,
				 int flags = SND_NOFLAGS,
				 float volume = SNDVOL_NORMAL,
				 int pitch = SNDPITCH_NORMAL,
				 int speakerentity = -1,
				 const float origin[3] = NULL_VECTOR,
				 const float dir[3] = NULL_VECTOR,
				 bool updatePos = true,
				 float soundtime = 0.0)
{
	int clients[1];
	clients[0] = client;
	/* Save some work for SDKTools and remove SOUND_FROM_PLAYER references */
	entity = (entity == SOUND_FROM_PLAYER) ? client : entity;
	EmitSound(clients, 1, sample, entity, channel,
		level, flags, volume, pitch, speakerentity,
		origin, dir, updatePos, soundtime);
}

/**
 * Wrapper to emit sound to all clients.
 *
 * @param sample        Sound file name relative to the "sound" folder.
 * @param entity        Entity to emit from.
 * @param channel       Channel to emit with.
 * @param level         Sound level.
 * @param flags         Sound flags.
 * @param volume        Sound volume.
 * @param pitch         Sound pitch.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @error               Invalid client index.
 */
stock void EmitSoundToAll(const char[] sample,
				 int entity = SOUND_FROM_PLAYER,
				 int channel = SNDCHAN_AUTO,
				 int level = SNDLEVEL_NORMAL,
				 int flags = SND_NOFLAGS,
				 float volume = SNDVOL_NORMAL,
				 int pitch = SNDPITCH_NORMAL,
				 int speakerentity = -1,
				 const float origin[3] = NULL_VECTOR,
				 const float dir[3] = NULL_VECTOR,
				 bool updatePos = true,
				 float soundtime = 0.0)
{
	int[] clients = new int[MaxClients];
	int total = 0;

	for (int i=1; i<=MaxClients; i++)
	{
		if (IsClientInGame(i))
		{
			clients[total++] = i;
		}
	}

	if (total)
	{
		EmitSound(clients, total, sample, entity, channel,
			level, flags, volume, pitch, speakerentity,
			origin, dir, updatePos, soundtime);
	}
}

/**
 * Converts an attenuation value to a sound level.
 * This function is from the HL2SDK.
 *
 * @param attn          Attenuation value.
 * @return              Integer sound level.
 */
stock int ATTN_TO_SNDLEVEL(float attn)
{
	if (attn > 0.0)
	{
		return RoundFloat(50.0 + (20.0 / attn));
	}
	return 0;
}

/**
 * Retrieves the parameters for a game sound.
 *
 * Game sounds are found in a game's scripts/game_sound.txt or other files
 * referenced from it
 *
 * Note that if a game sound has a rndwave section, one of them will be returned
 * at random.
 *
 * @param gameSound     Name of game sound.
 * @param channel       Channel to emit with.
 * @param level         Sound level.
 * @param volume        Sound volume.
 * @param pitch         Sound pitch.
 * @param sample        Sound file name relative to the "sound" folder.
 * @param maxlength     Maximum length of sample string buffer.
 * @param entity        Entity the sound is being emitted from.
 * @return              True if the sound was successfully retrieved, false if it
 *                      was not found
 */
native bool GetGameSoundParams(const char[] gameSound,
				int &channel,
				int &soundLevel,
				float &volume,
				int &pitch,
				char[] sample,
				int maxlength,
				int entity=SOUND_FROM_PLAYER);

/**
 * Emits a game sound to a list of clients.
 *
 * Game sounds are found in a game's scripts/game_sound.txt or other files
 * referenced from it
 *
 * Note that if a game sound has a rndwave section, one of them will be returned
 * at random.
 *
 * @param clients       Array of client indexes.
 * @param numClients    Number of clients in the array.
 * @param gameSound     Name of game sound.
 * @param entity        Entity to emit from.
 * @param flags         Sound flags.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @return              True if the sound was played successfully, false if it failed
 * @error               Invalid client index or client not in game.
 */
stock bool EmitGameSound(const int[] clients,
				int numClients,
				const char[] gameSound,
				int entity = SOUND_FROM_PLAYER,
				int flags = SND_NOFLAGS,
				int speakerentity = -1,
				const float origin[3] = NULL_VECTOR,
				const float dir[3] = NULL_VECTOR,
				bool updatePos = true,
				float soundtime = 0.0)
{
	int channel;
	int level;
	float volume;
	int pitch;
	char sample[PLATFORM_MAX_PATH];

	if (GetGameSoundParams(gameSound, channel, level, volume, pitch, sample, sizeof(sample), entity))
	{
		EmitSound(clients, numClients, sample, entity, channel, level, flags, volume, pitch, speakerentity, origin, dir, updatePos, soundtime);
		return true;
	}

	return false;
}

/**
 * Emits an ambient game sound.
 *
 * Game sounds are found in a game's scripts/game_sound.txt or other files
 * referenced from it
 *
 * Note that if a game sound has a rndwave section, one of them will be returned
 * at random.
 *
 * @param gameSound     Name of game sound.
 * @param pos           Origin of sound.
 * @param entity        Entity index to associate sound with.
 * @param flags         Sound flags.
 * @param delay         Play delay.
 */
stock bool EmitAmbientGameSound(const char[] gameSound,
				const float pos[3],
				int entity = SOUND_FROM_WORLD,
				int flags = SND_NOFLAGS,
				float delay = 0.0)
{
	int channel; // This is never actually used for Ambients, but it's a mandatory field to GetGameSoundParams
	int level;
	float volume;
	int pitch;
	char sample[PLATFORM_MAX_PATH];

	if (GetGameSoundParams(gameSound, channel, level, volume, pitch, sample, sizeof(sample), entity))
	{
		EmitAmbientSound(sample, pos, entity, level, flags, volume, pitch, delay);
		return true;
	}

	return false;
}

/**
 * Wrapper to emit a game sound to one client.
 *
 * Game sounds are found in a game's scripts/game_sound.txt or other files
 * referenced from it
 *
 * Note that if a game sound has a rndwave section, one of them will be returned
 * at random.
 *
 * @param client        Client index.
 * @param gameSound     Name of game sound.
 * @param entity        Entity to emit from.
 * @param flags         Sound flags.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @error               Invalid client index or client not in game.
 */
stock bool EmitGameSoundToClient(int client,
				const char[] gameSound,
				int entity = SOUND_FROM_PLAYER,
				int flags = SND_NOFLAGS,
				int speakerentity = -1,
				const float origin[3] = NULL_VECTOR,
				const float dir[3] = NULL_VECTOR,
				bool updatePos = true,
				float soundtime = 0.0)
{
	int clients[1];
	clients[0] = client;
	/* Save some work for SDKTools and remove SOUND_FROM_PLAYER references */
	entity = (entity == SOUND_FROM_PLAYER) ? client : entity;
	return EmitGameSound(clients, 1, gameSound, entity, flags,
		speakerentity, origin, dir, updatePos, soundtime);
}

/**
 * Wrapper to emit game sound to all clients.
 *
 * Game sounds are found in a game's scripts/game_sound.txt or other files
 * referenced from it
 *
 * Note that if a game sound has a rndwave section, one of them will be returned
 * at random.
 *
 * @param gameSound     Name of game sound.
 * @param entity        Entity to emit from.
 * @param flags         Sound flags.
 * @param speakerentity Unknown.
 * @param origin        Sound origin.
 * @param dir           Sound direction.
 * @param updatePos     Unknown (updates positions?)
 * @param soundtime     Alternate time to play sound for.
 * @error               Invalid client index.
 */
stock bool EmitGameSoundToAll(const char[] gameSound,
				int entity = SOUND_FROM_PLAYER,
				int flags = SND_NOFLAGS,
				int speakerentity = -1,
				const float origin[3] = NULL_VECTOR,
				const float dir[3] = NULL_VECTOR,
				bool updatePos = true,
				float soundtime = 0.0)
{
	int[] clients = new int[MaxClients];
	int total = 0;

	for (int i=1; i<=MaxClients; i++)
	{
		if (IsClientInGame(i))
		{
			clients[total++] = i;
		}
	}

	if (!total)
	{
		return false;
	}

	return EmitGameSound(clients, total, gameSound, entity, flags,
		speakerentity, origin, dir, updatePos, soundtime);
}

/**
 * Precache a game sound.
 *
 * Most games will precache all game sounds on map start, but this is not guaranteed...
 * Team Fortress 2 is known to not pre-cache MvM game mode sounds on non-MvM maps.
 *
 * Due to the above, this native should be called before any calls to GetGameSoundParams,
 * EmitGameSound*, or EmitAmbientGameSound.
 *
 * It should be safe to pass already precached game sounds to this function.
 *
 * Note: It precaches all files for a game sound.
 *
 * @param soundname     Game sound to precache
 * @return              True if the game sound was found, false if sound did not exist
 *                      or had no files
 */
native bool PrecacheScriptSound(const char[] soundname);
