xash3d-fwgs/engine/common/common.h

/*
common.h - definitions common between client and server
Copyright (C) 2007 Uncle Mike

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, either version 3 of the License, or
(at your option) any later version.

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.
*/

#ifndef COMMON_H
#define COMMON_H

#ifdef __cplusplus
extern "C" {
#endif

/*
===================================================================================================================================
Legend:

INTERNAL RESOURCE			- function contain hardcoded path to resource that engine required (optional in most cases)
OBSOLETE, UNUSED			- this function no longer used and leaved here for keep binary compatibility
TODO				- some functionality not impemented but planned
FIXME				- code doesn't working properly in some rare cases
HACKHACK				- unexpected behavior on some input params (or something like)
BUGBUG				- code doesn't working properly in most cases!
TESTTEST				- this code may be unstable and needs to be more tested
g-cont:				- notes from engine author
XASH SPECIFIC			- sort of hack that works only in Xash3D not in GoldSrc
===================================================================================================================================
*/

#include "port.h"

#include "backends.h"
#include "defaults.h"

#include <stdio.h>
#include <stdlib.h> // rand, adbs
#include <stdarg.h> // va

#ifndef _WIN32
#include <stddef.h> // size_t

#ifdef __i386__
#define EXPORT __attribute__ ((visibility ("default"),force_align_arg_pointer))
#else
#define EXPORT __attribute__ ((visibility ("default")))
#endif
#else
#include <sys/types.h> // off_t

#define EXPORT		__declspec( dllexport )
#endif

// configuration

//
// check if selected backend not allowed
//
#if XASH_TIMER == TIMER_NULL
	#error "Please select timer backend"
#endif

#ifndef XASH_DEDICATED
	#if XASH_VIDEO == VIDEO_NULL
		#error "Please select video backend"
	#endif
#endif

#ifndef XASH_SDL

#if XASH_TIMER == TIMER_SDL || XASH_VIDEO == VIDEO_SDL || XASH_SOUND == SOUND_SDL || XASH_INPUT == INPUT_SDL
#error "SDL backends without XASH_SDL not allowed"
#endif

#endif

#define HACKS_RELATED_HLMODS		// some HL-mods works differently under Xash and can't be fixed without some hacks at least at current time

#define MAX_STRING		256	// generic string
#define MAX_INFO_STRING	256	// infostrings are transmitted across network
#define MAX_SERVERINFO_STRING	512	// server handles too many settings. expand to 1024?
#define MAX_LOCALINFO_STRING	32768	// localinfo used on server and not sended to the clients
#define MAX_SYSPATH		1024	// system filepath
#define MAX_PRINT_MSG	8192	// how many symbols can handle single call of Msg or MsgDev
#define MAX_TOKEN		2048	// parse token length
#define MAX_MODS		512	// environment games that engine can keep visible
#define MAX_USERMSG_LENGTH	2048	// don't modify it's relies on a client-side definitions

#define BIT( n )		( 1 << ( n ))
#define GAMMA		( 2.2 )		// Valve Software gamma
#define INVGAMMA		( 1.0 / 2.2 )	// back to 1.0
#define TEXGAMMA		( 0.9 )		// compensate dim textures
#define SetBits( iBitVector, bits )	((iBitVector) = (iBitVector) | (bits))
#define ClearBits( iBitVector, bits )	((iBitVector) = (iBitVector) & ~(bits))
#define FBitSet( iBitVector, bit )	((iBitVector) & (bit))

#ifndef __cplusplus
#define NULL		((void *)0)
#endif

// color strings
#define IsColorString( p )	( p && *( p ) == '^' && *(( p ) + 1) && *(( p ) + 1) >= '0' && *(( p ) + 1 ) <= '9' )
#define ColorIndex( c )	((( c ) - '0' ) & 7 )

#if defined __i386__ &&  defined __GNUC__
#define GAME_EXPORT __attribute__((force_align_arg_pointer))
#else
#define GAME_EXPORT
#endif

typedef unsigned long	dword;
typedef unsigned int	uint;
typedef char		string[MAX_STRING];
typedef struct file_s	file_t;		// normal file
typedef struct wfile_s	wfile_t;		// wad file
typedef struct stream_s	stream_t;		// sound stream for background music playing

typedef void (*setpair_t)( const char *key, const char *value, void *buffer, void *numpairs );

typedef struct
{
	int	numfilenames;
	char	**filenames;
	char	*filenamesbuffer;
} search_t;

enum
{
	DEV_NONE = 0,
	DEV_NORMAL,
	DEV_EXTENDED
};

enum
{
	D_INFO = 1,	// "-dev 1", shows various system messages
	D_WARN,		// "-dev 2", shows not critical system warnings
	D_ERROR,		// "-dev 3", shows critical warnings 
	D_REPORT,		// "-dev 4", special case for game reports
	D_NOTE		// "-dev 5", show system notifications for engine developers
};

typedef enum
{	
	HOST_NORMAL,	// listen server, singleplayer
	HOST_DEDICATED,
} instance_t;

#ifdef XASH_DEDICATED
#define Host_IsDedicated() ( true )
#else
#define Host_IsDedicated() ( host.type == HOST_DEDICATED )
#endif

#include "system.h"
#include "com_model.h"
#include "com_strings.h"
#include "crtlib.h"
#include "cvar.h"
#include "con_nprint.h"

#define XASH_VERSION	0.99f		// engine current version

// PERFORMANCE INFO
#define MIN_FPS         	20.0		// host minimum fps value for maxfps.
#define MAX_FPS         	200.0		// upper limit for maxfps.
#define HOST_FPS		72.0		// multiplayer games typical fps

#define MAX_FRAMETIME	0.25
#define MIN_FRAMETIME	0.0001
#define GAME_FPS		20.0

#define MAX_CMD_TOKENS	80		// cmd tokens
#define MAX_ENTNUMBER	99999		// for server and client parsing
#define MAX_HEARTBEAT	-99999		// connection time
#define QCHAR_WIDTH		16		// font width

#define CIN_MAIN		0
#define CIN_LOGO		1

// config strings are a general means of communication from
// the server to all connected clients.
// each config string can be at most CS_SIZE characters.
#define MAX_QPATH		64	// max length of a game pathname
#define MAX_OSPATH		260	// max length of a filesystem pathname
#define CS_SIZE		64	// size of one config string
#define CS_TIME		16	// size of time string

#define MAX_DECALS		512	// touching TE_DECAL messages, etc
#define MAX_STATIC_ENTITIES	3096	// static entities that moved on the client when level is spawn

// filesystem flags
#define FS_STATIC_PATH	1	// FS_ClearSearchPath will be ignore this path
#define FS_NOWRITE_PATH	2	// default behavior - last added gamedir set as writedir. This flag disables it
#define FS_GAMEDIR_PATH	4	// just a marker for gamedir path
#define FS_CUSTOM_PATH  8   // custom directory

#define GI		SI.GameInfo
#define FS_Gamedir()	SI.GameInfo->gamedir
#define FS_Title()		SI.GameInfo->title
#define GameState		(&host.game)

#define FORCE_DRAW_VERSION_TIME 5.0f // draw version for 5 seconds

#ifdef _DEBUG
void DBG_AssertFunction( qboolean fExpr, const char* szExpr, const char* szFile, int szLine, const char* szMessage );
#define Assert( f )		DBG_AssertFunction( f, #f, __FILE__, __LINE__, NULL )
#else
#define Assert( f )
#endif

extern convar_t	*gl_vsync;
extern convar_t	*scr_loading;
extern convar_t	*scr_download;
extern convar_t	*cmd_scripting;
extern convar_t	*sv_maxclients;
extern convar_t	*cl_allow_levelshots;
extern convar_t	*vid_displayfrequency;
extern convar_t	host_developer;
extern convar_t	*host_limitlocal;
extern convar_t	*host_framerate;
extern convar_t	*host_maxfps;

/*
==============================================================

HOST INTERFACE

==============================================================
*/
/*
========================================================================

GAMEINFO stuff

internal shared gameinfo structure (readonly for engine parts)
========================================================================
*/
typedef struct gameinfo_s
{
	// filesystem info
	char		gamefolder[MAX_QPATH];	// used for change game '-game x'
	char		basedir[MAX_QPATH];	// base game directory (like 'id1' for Quake or 'valve' for Half-Life)
	char		gamedir[MAX_QPATH];	// game directory (can be match with basedir, used as game dir and as write path)
	char		falldir[MAX_QPATH];	// used as second basedir 
	char		startmap[MAX_QPATH];// map to start singleplayer game
	char		trainmap[MAX_QPATH];// map to start hazard course (if specified)
	char		title[64];	// Game Main Title
	float		version;		// game version (optional)

	// .dll pathes
	char		dll_path[MAX_QPATH];	// e.g. "bin" or "cl_dlls"
	char		game_dll[MAX_QPATH];	// custom path for game.dll

	// .ico path
	char		iconpath[MAX_QPATH];	// "game.ico" by default

	// about mod info
	string		game_url;		// link to a developer's site
	string		update_url;	// link to updates page
	char		type[MAX_QPATH];	// single, toolkit, multiplayer etc
	char		date[MAX_QPATH];
	size_t		size;

	int		gamemode;
	qboolean		secure;		// prevent to console acess
	qboolean		nomodels;		// don't let player to choose model (use player.mdl always)

	char		sp_entity[32];	// e.g. info_player_start
	char		mp_entity[32];	// e.g. info_player_deathmatch

	char		ambientsound[NUM_AMBIENTS][MAX_QPATH];	// quake ambient sounds

	int		max_edicts;	// min edicts is 600, max edicts is 4096
	int		max_tents;	// min temp ents is 300, max is 2048
	int		max_beams;	// min beams is 64, max beams is 512
	int		max_particles;	// min particles is 4096, max particles is 32768

	char		game_dll_linux[64];	// custom path for game.dll
	char		game_dll_osx[64];	// custom path for game.dll
	char		client_lib[64];	// custom name of client library
} gameinfo_t;

typedef enum
{
	GAME_NORMAL,
	GAME_SINGLEPLAYER_ONLY,
	GAME_MULTIPLAYER_ONLY
} gametype_t;

typedef struct sysinfo_s
{
	string		exeName;		// exe.filename
	string		rcName;		// .rc script name
	string		basedirName;	// name of base directory
	gameinfo_t	*GameInfo;	// current GameInfo
	gameinfo_t	*games[MAX_MODS];	// environment games (founded at each engine start)
	int		numgames;
} sysinfo_t;

typedef enum
{
	HOST_INIT = 0,	// initalize operations
	HOST_FRAME,	// host running
	HOST_SHUTDOWN,	// shutdown operations	
	HOST_ERR_FATAL,	// sys error
	HOST_SLEEP,	// sleeped by different reason, e.g. minimize window
	HOST_NOFOCUS,	// same as HOST_FRAME, but disable mouse
	HOST_CRASHED	// an exception handler called
} host_status_t;

typedef enum 
{
	STATE_RUNFRAME = 0,
	STATE_LOAD_LEVEL,
	STATE_LOAD_GAME,
	STATE_CHANGELEVEL,
	STATE_GAME_SHUTDOWN,
} host_state_t;

typedef struct
{
	host_state_t	curstate;
	host_state_t	nextstate;
	char		levelName[MAX_QPATH];
	char		landmarkName[MAX_QPATH];
	qboolean		backgroundMap;
	qboolean		loadGame;
	qboolean		newGame;		// unload the server.dll before start a new map
} game_status_t;

typedef enum
{
	key_console = 0,
	key_game,
	key_menu,
	key_message
} keydest_t;

// MD5 Hash
typedef struct
{
	uint	buf[4];
	uint	bits[2];
	byte	in[64];
} MD5Context_t;

typedef enum
{
	RD_NONE = 0,
	RD_CLIENT,
	RD_PACKET
} rdtype_t;

#include "net_ws.h"

typedef struct host_redirect_s
{
	rdtype_t		target;
	char		*buffer;
	int		buffersize;
	netadr_t		address;
	void		(*flush)( netadr_t adr, rdtype_t target, char *buffer );
} host_redirect_t;

typedef struct
{
	char		name[MAX_QPATH];
	short		entnum;
	vec3_t		origin;
	float		volume;
	float		attenuation;
	qboolean		looping;
	byte		channel;
	byte		pitch;
	byte		wordIndex;	// current playing word in sentence
	double		samplePos;
	double		forcedEnd;
} soundlist_t;

typedef struct
{
	char		model[MAX_QPATH];	// curstate.modelindex = SV_ModelIndex
	vec3_t		tentOffset;	// if attached, client origin + tentOffset = tent origin.
	short		clientIndex;
	float		fadeSpeed;
	float		bounceFactor;
	byte		hitSound;
	qboolean		high_priority;
	float		x, y, z;
	int		flags;
	float		time;

	// base state
	vec3_t		velocity;		// baseline.origin
	vec3_t		avelocity;	// baseline.angles
	int		fadeamount;	// baseline.renderamt
	float		sparklife;	// baseline.framerate
	float		thinkTime;	// baseline.scale

	// current state
	vec3_t		origin;		// entity.origin
	vec3_t		angles;		// entity.angles
	float		renderamt;	// curstate.renderamt
	color24		rendercolor;	// curstate.rendercolor
	int		rendermode;	// curstate.rendermode
	int		renderfx;		// curstate.renderfx
	float		framerate;	// curstate.framerate
	float		frame;		// curstate.frame
	byte		body;		// curstate.body
	byte		skin;		// curstate.skin
	float		scale;		// curstate.scale
} tentlist_t;

typedef struct host_parm_s
{
	HINSTANCE			hInst;

	host_status_t	status;		// global host state
	game_status_t	game;		// game manager
	uint		type;		// running at
	jmp_buf		abortframe;	// abort current frame
	dword		errorframe;	// to prevent multiple host error
	byte		*mempool;		// static mempool for misc allocations
	string		finalmsg;		// server shutdown final message
	string		downloadfile;	// filename to be downloading
	int		downloadcount;	// how many files remain to downloading
	host_redirect_t	rd;		// remote console

	// command line parms
	int		argc;
	const char	**argv;

	double		realtime;		// host.curtime
	double		frametime;	// time between engine frames
	double		realframetime;	// for some system events, e.g. console animations

	uint		framecount;	// global framecount

	// list of unique decal indexes
	char		draw_decals[MAX_DECALS][MAX_QPATH];

	vec3_t		player_mins[MAX_MAP_HULLS];	// 4 hulls allowed
	vec3_t		player_maxs[MAX_MAP_HULLS];	// 4 hulls allowed

	void*			hWnd;		// main window
	qboolean		allow_console;	// allow console in dev-mode or multiplayer game
	qboolean		allow_console_init;	// initial value to allow the console
	qboolean		key_overstrike;	// key overstrike mode
	qboolean		stuffcmds_pending;	// should execute stuff commands
	qboolean		allow_cheats;	// this host will allow cheating
	qboolean		con_showalways;	// show console always (developer and dedicated)
	qboolean		com_handlecolon;	// allow COM_ParseFile to handle colon as single char
	qboolean		com_ignorebracket;	// allow COM_ParseFile to ignore () as single char
	qboolean		change_game;	// initialize when game is changed
	qboolean		mouse_visible;	// vgui override cursor control
	qboolean		shutdown_issued;	// engine is shutting down
	qboolean		force_draw_version;	// used when fraps is loaded
	float			force_draw_version_time;
	qboolean		write_to_clipboard;	// put image to clipboard instead of disk
	qboolean		apply_game_config;	// when true apply only to game cvars and ignore all other commands
	qboolean		config_executed;	// a bit who indicated was config.cfg already executed e.g. from valve.rc
	int		sv_cvars_restored;	// count of restored server cvars
	qboolean		crashed;		// set to true if crashed
	qboolean		daemonized;
	qboolean		enabledll;
	qboolean		textmode;

	// some settings were changed and needs to global update
	qboolean		userinfo_changed;
	qboolean		movevars_changed;
	qboolean		renderinfo_changed;

	char		rootdir[256];	// member root directory
	char		gamefolder[MAX_QPATH];	// it's a default gamefolder	
	byte		*imagepool;	// imagelib mempool
	byte		*soundpool;	// soundlib mempool

	uint		features;		// custom features that enables by mod-maker request

	// for IN_MouseMove() easy access
	int		window_center_x;
	int		window_center_y;

	struct decallist_s	*decalList;	// used for keep decals, when renderer is restarted or changed
	int		numdecals;

} host_parm_t;

extern host_parm_t	host;
extern sysinfo_t	SI;

//
// filesystem.c
//
void FS_Init( void );
void FS_Path( void );
void FS_Rescan( void );
void FS_Shutdown( void );
void FS_ClearSearchPath( void );
void FS_AllowDirectPaths( qboolean enable );
void FS_AddGameDirectory( const char *dir, int flags );
void FS_AddGameHierarchy( const char *dir, int flags );
void FS_LoadGameInfo( const char *rootfolder );
void COM_FileBase( const char *in, char *out );
const char *COM_FileExtension( const char *in );
void COM_DefaultExtension( char *path, const char *extension );
void COM_ReplaceExtension( char *path, const char *extension );
void COM_ExtractFilePath( const char *path, char *dest );
const char *FS_GetDiskPath( const char *name, qboolean gamedironly );
const char *COM_FileWithoutPath( const char *in );
byte *W_LoadLump( wfile_t *wad, const char *lumpname, size_t *lumpsizeptr, const char type );
void W_Close( wfile_t *wad );
byte *FS_LoadFile( const char *path, long *filesizeptr, qboolean gamedironly );
byte *FS_LoadDirectFile( const char *path, long *filesizeptr );
qboolean FS_WriteFile( const char *filename, const void *data, long len );
qboolean COM_ParseVector( char **pfile, float *v, size_t size );
void COM_NormalizeAngles( vec3_t angles );
int COM_FileSize( const char *filename );
void COM_FixSlashes( char *pname );
void COM_FreeFile( void *buffer );
int COM_CheckString( const char *string );
int COM_CompareFileTime( const char *filename1, const char *filename2, int *iCompare );
search_t *FS_Search( const char *pattern, int caseinsensitive, int gamedironly );
file_t *FS_Open( const char *filepath, const char *mode, qboolean gamedironly );
long FS_Write( file_t *file, const void *data, size_t datasize );
long FS_Read( file_t *file, void *buffer, size_t buffersize );
int FS_VPrintf( file_t *file, const char *format, va_list ap );
int FS_Seek( file_t *file, long offset, int whence );
int FS_Gets( file_t *file, byte *string, size_t bufsize );
int FS_Printf( file_t *file, const char *format, ... );
long FS_FileSize( const char *filename, qboolean gamedironly );
long FS_FileTime( const char *filename, qboolean gamedironly );
int FS_Print( file_t *file, const char *msg );
qboolean FS_Rename( const char *oldname, const char *newname );
qboolean FS_FileExists( const char *filename, qboolean gamedironly );
qboolean FS_SysFileExists( const char *path, qboolean casesensitive );
qboolean FS_FileCopy( file_t *pOutput, file_t *pInput, int fileSize );
qboolean FS_Delete( const char *path );
int FS_UnGetc( file_t *file, byte c );
void COM_StripExtension( char *path );
long FS_Tell( file_t *file );
qboolean FS_Eof( file_t *file );
int FS_Close( file_t *file );
int FS_Getc( file_t *file );
long FS_FileLength( file_t *f );

/*
========================================================================

internal image format

typically expanded to rgba buffer
NOTE: number at end of pixelformat name it's a total bitscount e.g. PF_RGB_24 == PF_RGB_888
========================================================================
*/
#define ImageRAW( type )	(type == PF_RGBA_32 || type == PF_BGRA_32 || type == PF_RGB_24 || type == PF_BGR_24)
#define ImageDXT( type )	(type == PF_DXT1 || type == PF_DXT3 || type == PF_DXT5)

typedef enum
{
	PF_UNKNOWN = 0,
	PF_INDEXED_24,	// inflated palette (768 bytes)
	PF_INDEXED_32,	// deflated palette (1024 bytes)
	PF_RGBA_32,	// normal rgba buffer
	PF_BGRA_32,	// big endian RGBA (MacOS)
	PF_RGB_24,	// uncompressed dds or another 24-bit image 
	PF_BGR_24,	// big-endian RGB (MacOS)
	PF_DXT1,		// s3tc DXT1 format
	PF_DXT3,		// s3tc DXT3 format
	PF_DXT5,		// s3tc DXT5 format
	PF_TOTALCOUNT,	// must be last
} pixformat_t;

typedef struct bpc_desc_s
{
	int	format;	// pixelformat
	char	name[16];	// used for debug
	uint	glFormat;	// RGBA format
	int	bpp;	// channels (e.g. rgb = 3, rgba = 4)
} bpc_desc_t;

// imagelib global settings
typedef enum
{
	IL_USE_LERPING	= BIT(0),	// lerping images during resample
	IL_KEEP_8BIT	= BIT(1),	// don't expand paletted images
	IL_ALLOW_OVERWRITE	= BIT(2),	// allow to overwrite stored images
	IL_DONTFLIP_TGA	= BIT(3),	// Steam background completely ignore tga attribute 0x20 (stupid lammers!)
	IL_DDS_HARDWARE	= BIT(4),	// DXT compression is support
	IL_LOAD_DECAL	= BIT(5),	// special mode for load gradient decals
	IL_OVERVIEW	= BIT(6),	// overview required some unque operations
} ilFlags_t;

// goes into rgbdata_t->encode
#define DXT_ENCODE_DEFAULT		0	// don't use custom encoders
#define DXT_ENCODE_COLOR_YCoCg	0x1A01	// make sure that value dosn't collide with anything
#define DXT_ENCODE_ALPHA_1BIT		0x1A02	// normal 1-bit alpha
#define DXT_ENCODE_ALPHA_8BIT		0x1A03	// normal 8-bit alpha
#define DXT_ENCODE_ALPHA_SDF		0x1A04	// signed distance field
#define DXT_ENCODE_NORMAL_AG_ORTHO	0x1A05	// orthographic projection
#define DXT_ENCODE_NORMAL_AG_STEREO	0x1A06	// stereographic projection
#define DXT_ENCODE_NORMAL_AG_PARABOLOID	0x1A07	// paraboloid projection
#define DXT_ENCODE_NORMAL_AG_QUARTIC	0x1A08	// newton method
#define DXT_ENCODE_NORMAL_AG_AZIMUTHAL	0x1A09	// Lambert Azimuthal Equal-Area

// rgbdata output flags
typedef enum
{
	// rgbdata->flags
	IMAGE_CUBEMAP	= BIT(0),		// it's 6-sides cubemap buffer
	IMAGE_HAS_ALPHA	= BIT(1),		// image contain alpha-channel
	IMAGE_HAS_COLOR	= BIT(2),		// image contain RGB-channel
	IMAGE_COLORINDEX	= BIT(3),		// all colors in palette is gradients of last color (decals)
	IMAGE_HAS_LUMA	= BIT(4),		// image has luma pixels (q1-style maps)
	IMAGE_SKYBOX	= BIT(5),		// only used by FS_SaveImage - for write right suffixes
	IMAGE_QUAKESKY	= BIT(6),		// it's a quake sky double layered clouds (so keep it as 8 bit)
	IMAGE_DDS_FORMAT	= BIT(7),		// a hint for GL loader
	IMAGE_MULTILAYER	= BIT(8),		// to differentiate from 3D texture
	IMAGE_ONEBIT_ALPHA	= BIT(9),		// binary alpha
	IMAGE_QUAKEPAL	= BIT(10),	// image has quake1 palette

	// Image_Process manipulation flags
	IMAGE_FLIP_X	= BIT(16),	// flip the image by width
	IMAGE_FLIP_Y	= BIT(17),	// flip the image by height
	IMAGE_ROT_90	= BIT(18),	// flip from upper left corner to down right corner
	IMAGE_ROT180	= IMAGE_FLIP_X|IMAGE_FLIP_Y,
	IMAGE_ROT270	= IMAGE_FLIP_X|IMAGE_FLIP_Y|IMAGE_ROT_90,	
// reserved
	IMAGE_RESAMPLE	= BIT(20),	// resample image to specified dims
// reserved
// reserved
	IMAGE_FORCE_RGBA	= BIT(23),	// force image to RGBA buffer
	IMAGE_MAKE_LUMA	= BIT(24),	// create luma texture from indexed
	IMAGE_QUANTIZE	= BIT(25),	// make indexed image from 24 or 32- bit image
	IMAGE_LIGHTGAMMA	= BIT(26),	// apply gamma for image
	IMAGE_REMAP	= BIT(27),	// interpret width and height as top and bottom color
} imgFlags_t;

// ordering is important!
typedef enum
{
	BLUR_FILTER = 0,
	BLUR_FILTER2,
	EDGE_FILTER,
	EMBOSS_FILTER,
	NUM_FILTERS,
} pixfilter_t;

typedef struct rgbdata_s
{
	word	width;		// image width
	word	height;		// image height
	word	depth;		// image depth
	uint	type;		// compression type
	uint	flags;		// misc image flags
	word	encode;		// DXT may have custom encoder, that will be decoded in GLSL-side
	byte	numMips;		// mipmap count
	byte	*palette;		// palette if present
	byte	*buffer;		// image buffer
	rgba_t	fogParams;	// some water textures in hl1 has info about fog color and alpha
	size_t	size;		// for bounds checking
} rgbdata_t;

// imgfilter processing flags
typedef enum
{
	FILTER_GRAYSCALE	= BIT(0),
} flFlags_t;

typedef struct imgfilter_s
{
	int	filter;		// pixfilter_t
	float	factor;		// filter factor value
	float	bias;		// filter bias value
	flFlags_t	flags;		// filter additional flags
	uint	blendFunc;	// blending mode
} imgfilter_t;

//
// imagelib
//
void Image_Init( void );
void Image_Shutdown( void );
void Image_AddCmdFlags( uint flags );
rgbdata_t *FS_LoadImage( const char *filename, const byte *buffer, size_t size );
qboolean FS_SaveImage( const char *filename, rgbdata_t *pix );
rgbdata_t *FS_CopyImage( rgbdata_t *in );
void FS_FreeImage( rgbdata_t *pack );
extern const bpc_desc_t PFDesc[];	// image get pixelformat
qboolean Image_Process( rgbdata_t **pix, int width, int height, uint flags, imgfilter_t *filter );
void Image_PaletteHueReplace( byte *palSrc, int newHue, int start, int end, int pal_size );
void Image_PaletteTranslate( byte *palSrc, int top, int bottom, int pal_size );
void Image_SetForceFlags( uint flags );	// set image force flags on loading
size_t Image_DXTGetLinearSize( int type, int width, int height, int depth );
void Image_ClearForceFlags( void );

/*
========================================================================

internal sound format

typically expanded to wav buffer
========================================================================
*/
typedef enum
{
	WF_UNKNOWN = 0,
	WF_PCMDATA,
	WF_MPGDATA,
	WF_TOTALCOUNT,	// must be last
} sndformat_t;

// soundlib global settings
typedef enum
{
	SL_USE_LERPING	= BIT(0),		// lerping sounds during resample
	SL_KEEP_8BIT	= BIT(1),		// don't expand 8bit sounds automatically up to 16 bit
	SL_ALLOW_OVERWRITE	= BIT(2),		// allow to overwrite stored sounds
} slFlags_t;

// wavdata output flags
typedef enum
{
	// wavdata->flags
	SOUND_LOOPED	= BIT( 0 ),	// this is looped sound (contain cue markers)
	SOUND_STREAM	= BIT( 1 ),	// this is a streaminfo, not a real sound

	// Sound_Process manipulation flags
	SOUND_RESAMPLE	= BIT(12),	// resample sound to specified rate
	SOUND_CONVERT16BIT	= BIT(13),	// change sound resolution from 8 bit to 16
} sndFlags_t;

typedef struct
{
	word	rate;		// num samples per second (e.g. 11025 - 11 khz)
	byte	width;		// resolution - bum bits divided by 8 (8 bit is 1, 16 bit is 2)
	byte	channels;		// num channels (1 - mono, 2 - stereo)
	int	loopStart;	// offset at this point sound will be looping while playing more than only once
	int	samples;		// total samplecount in wav
	uint	type;		// compression type
	uint	flags;		// misc sound flags
	byte	*buffer;		// sound buffer
	size_t	size;		// for bounds checking
} wavdata_t;

//
// soundlib
//
void Sound_Init( void );
void Sound_Shutdown( void );
wavdata_t *FS_LoadSound( const char *filename, const byte *buffer, size_t size );
void FS_FreeSound( wavdata_t *pack );
stream_t *FS_OpenStream( const char *filename );
wavdata_t *FS_StreamInfo( stream_t *stream );
long FS_ReadStream( stream_t *stream, int bytes, void *buffer );
long FS_SetStreamPos( stream_t *stream, long newpos );
long FS_GetStreamPos( stream_t *stream );
void FS_FreeStream( stream_t *stream );
qboolean Sound_Process( wavdata_t **wav, int rate, int width, uint flags );

//
// build.c
//
int Q_buildnum( void );

//
// host.c
//
void EXPORT Host_Shutdown( void );
int Host_CompareFileTime( long ft1, long ft2 );
void Host_NewInstance( const char *name, const char *finalmsg );
void Host_EndGame( qboolean abort, const char *message, ... );
void Host_AbortCurrentFrame( void );
void Host_WriteServerConfig( const char *name );
void Host_WriteOpenGLConfig( void );
void Host_WriteVideoConfig( void );
void Host_WriteConfig( void );
qboolean Host_IsLocalGame( void );
qboolean Host_IsLocalClient( void );
void Host_ShutdownServer( void );
void Host_Error( const char *error, ... );
void Host_PrintEngineFeatures( void );
void Host_Frame( float time );
void Host_InitDecals( void );
void Host_Credits( void );

//
// host_state.c
//
void COM_InitHostState( void );
void COM_NewGame( char const *pMapName );
void COM_LoadLevel( char const *pMapName, qboolean background );
void COM_LoadGame( char const *pSaveFileName );
void COM_ChangeLevel( char const *pNewLevel, char const *pLandmarkName, qboolean background );
void COM_Frame( float time );

/*
==============================================================

CLIENT / SERVER SYSTEMS

==============================================================
*/
void CL_Init( void );
void CL_Shutdown( void );
void Host_ClientBegin( void );
void Host_ClientFrame( void );
qboolean CL_Active( void );

void SV_Init( void );
void SV_Shutdown( const char *finalmsg );
void Host_ServerFrame( void );
qboolean SV_Active( void );

/*
==============================================================

	SHARED ENGFUNCS

==============================================================
*/
void pfnCvar_RegisterServerVariable( cvar_t *variable );
void pfnCvar_RegisterEngineVariable( cvar_t *variable );
cvar_t *pfnCvar_RegisterClientVariable( const char *szName, const char *szValue, int flags );
cvar_t *pfnCvar_RegisterGameUIVariable( const char *szName, const char *szValue, int flags );
char *COM_MemFgets( byte *pMemFile, int fileSize, int *filePos, char *pBuffer, int bufferSize );
void COM_HexConvert( const char *pszInput, int nInputLength, byte *pOutput );
int COM_SaveFile( const char *filename, const void *data, long len );
byte* COM_LoadFileForMe( const char *filename, int *pLength );
qboolean COM_IsSafeFileToDownload( const char *filename );
cvar_t *pfnCVarGetPointer( const char *szVarName );
int pfnDrawConsoleString( int x, int y, char *string );
void pfnDrawSetTextColor( float r, float g, float b );
void pfnDrawConsoleStringLen( const char *pText, int *length, int *height );
void *Cache_Check( byte *mempool, struct cache_user_s *c );
void COM_TrimSpace( const char *source, char *dest );
edict_t* pfnPEntityOfEntIndex( int iEntIndex );
void pfnGetModelBounds( model_t *mod, float *mins, float *maxs );
void pfnCVarDirectSet( cvar_t *var, const char *szValue );
int COM_CheckParm( char *parm, char **ppnext );
void pfnGetGameDir( char *szGetGameDir );
int pfnDecalIndex( const char *m );
int pfnGetModelType( model_t *mod );
int pfnIsMapValid( char *filename );
void Con_Reportf( char *szFmt, ... );
void Con_DPrintf( char *fmt, ... );
void Con_Printf( char *szFmt, ... );
int pfnNumberOfEntities( void );
int pfnIsInGame( void );
float pfnTime( void );

/*
==============================================================

	MISC COMMON FUNCTIONS

==============================================================
*/
#define Z_Malloc( size )		Mem_Alloc( host.mempool, size )
#define Z_Realloc( ptr, size )	Mem_Realloc( host.mempool, ptr, size )
#define Z_Free( ptr )		if( ptr != NULL ) Mem_Free( ptr )

//
// crclib.c
//
void CRC32_Init( dword *pulCRC );
byte CRC32_BlockSequence( byte *base, int length, int sequence );
void CRC32_ProcessBuffer( dword *pulCRC, const void *pBuffer, int nBuffer );
void CRC32_ProcessByte( dword *pulCRC, byte ch );
dword CRC32_Final( dword pulCRC );
qboolean CRC32_File( dword *crcvalue, const char *filename );
qboolean CRC32_MapFile( dword *crcvalue, const char *filename, qboolean multiplayer );
void MD5Init( MD5Context_t *ctx );
void MD5Update( MD5Context_t *ctx, const byte *buf, uint len );
void MD5Final( byte digest[16], MD5Context_t *ctx );
qboolean MD5_HashFile( byte digest[16], const char *pszFileName, uint seed[4] );
uint COM_HashKey( const char *string, uint hashSize );
char *MD5_Print( byte hash[16] );

//
// custom.c
//
void COM_ClearCustomizationList( customization_t *pHead, qboolean bCleanDecals );
qboolean COM_CreateCustomization( customization_t *pHead, resource_t *pRes, int playernum, int flags, customization_t **pCust, int *nLumps );
int COM_SizeofResourceList( resource_t *pList, resourceinfo_t *ri );

//
// cfgscript.c
//
int CSCR_LoadDefaultCVars( const char *scriptfilename );
int CSCR_WriteGameCVars( file_t *cfg, const char *scriptfilename );

//
// hpak.c
//
void HPAK_Init( void );
qboolean HPAK_GetDataPointer( const char *filename, struct resource_s *pRes, byte **buffer, int *size );
qboolean HPAK_ResourceForHash( const char *filename, byte *hash, struct resource_s *pRes );
void HPAK_AddLump( qboolean queue, const char *filename, struct resource_s *pRes, byte *data, file_t *f );
void HPAK_RemoveLump( const char *name, resource_t *resource );
void HPAK_CheckIntegrity( const char *filename );
void HPAK_CheckSize( const char *filename );
void HPAK_FlushHostQueue( void );

//
// keys.c
//
qboolean Key_IsDown( int keynum );
const char *Key_IsBind( int keynum );
void Key_Event( int key, qboolean down );
void Key_Init( void );
void Key_WriteBindings( file_t *f );
const char *Key_GetBinding( int keynum );
void Key_SetBinding( int keynum, const char *binding );
void Key_ClearStates( void );
const char *Key_KeynumToString( int keynum );
int Key_StringToKeynum( const char *str );
int Key_GetKey( const char *binding );
void Key_EnumCmds_f( void );
void Key_SetKeyDest( int key_dest );
void Key_EnableTextInput( qboolean enable, qboolean force );

#include "avi/avi.h"

// shared calls
typedef struct sv_client_s sv_client_t;
typedef struct sizebuf_s sizebuf_t;
typedef struct physent_s physent_t;
qboolean CL_IsInGame( void );
qboolean CL_IsInMenu( void );
qboolean CL_IsInConsole( void );
qboolean CL_IsThirdPerson( void );
qboolean CL_IsIntermission( void );
qboolean CL_Initialized( void );
char *CL_Userinfo( void );
void CL_CharEvent( int key );
qboolean CL_DisableVisibility( void );
int CL_PointContents( const vec3_t point );
char *COM_ParseFile( char *data, char *token );
byte *COM_LoadFile( const char *filename, int usehunk, int *pLength );
qboolean CL_GetDemoComment( const char *demoname, char *comment );
void COM_AddAppDirectoryToSearchPath( const char *pszBaseDir, const char *appName );
int COM_ExpandFilename( const char *fileName, char *nameOutBuffer, int nameOutBufferSize );
struct pmtrace_s *PM_TraceLine( float *start, float *end, int flags, int usehull, int ignore_pe );
void SV_StartSound( edict_t *ent, int chan, const char *sample, float vol, float attn, int flags, int pitch );
void SV_StartMusic( const char *curtrack, const char *looptrack, long position );
void SV_CreateDecal( sizebuf_t *msg, const float *origin, int decalIndex, int entityIndex, int modelIndex, int flags, float scale );
void Log_Printf( const char *fmt, ... );
struct sizebuf_s *SV_GetReliableDatagram( void );
void SV_BroadcastCommand( const char *fmt, ... );
qboolean SV_RestoreCustomDecal( struct decallist_s *entry, edict_t *pEdict, qboolean adjacent );
void SV_BroadcastPrintf( sv_client_t *ignore, char *fmt, ... );
int R_CreateDecalList( struct decallist_s *pList );
void R_DecalRemoveAll( int texture );
void R_ClearAllDecals( void );
void R_ClearStaticEntities( void );
qboolean S_StreamGetCurrentState( char *currentTrack, char *loopTrack, int *position );
struct cl_entity_s *CL_GetEntityByIndex( int index );
struct player_info_s *CL_GetPlayerInfo( int playerIndex );
void CL_ServerCommand( qboolean reliable, char *fmt, ... );
void CL_HudMessage( const char *pMessage );
const char *CL_MsgInfo( int cmd );
void SV_DrawDebugTriangles( void );
void SV_DrawOrthoTriangles( void );
double CL_GetDemoFramerate( void );
qboolean UI_CreditsActive( void );
void CL_ExtraUpdate( void );
int CL_GetMaxClients( void );
int SV_GetMaxClients( void );
qboolean CL_IsRecordDemo( void );
qboolean CL_IsTimeDemo( void );
qboolean CL_IsPlaybackDemo( void );
qboolean CL_IsBackgroundDemo( void );
qboolean CL_IsBackgroundMap( void );
qboolean SV_Initialized( void );
qboolean CL_LoadProgs( const char *name );
qboolean SV_GetSaveComment( const char *savename, char *comment );
qboolean SV_NewGame( const char *mapName, qboolean loadGame );
void SV_ClipPMoveToEntity( physent_t *pe, const vec3_t start, vec3_t mins, vec3_t maxs, const vec3_t end, struct pmtrace_s *tr );
void CL_ClipPMoveToEntity( physent_t *pe, const vec3_t start, vec3_t mins, vec3_t maxs, const vec3_t end, struct pmtrace_s *tr );
void CL_Particle( const vec3_t origin, int color, float life, int zpos, int zvel ); // debug thing
void SV_SysError( const char *error_string );
void SV_ShutdownGame( void );
void SV_ExecLoadLevel( void );
void SV_ExecLoadGame( void );
void SV_ExecChangeLevel( void );
void SV_InitGameProgs( void );
void SV_FreeGameProgs( void );
void CL_WriteMessageHistory( void );
void CL_SendCmd( void );
void CL_Disconnect( void );
void CL_ClearEdicts( void );
void CL_Crashed( void );
qboolean CL_NextDemo( void );
char *SV_Serverinfo( void );
void CL_Drop( void );
void Con_Init( void );
void SCR_Init( void );
void SCR_UpdateScreen( void );
void SCR_BeginLoadingPlaque( qboolean is_background );
void SCR_CheckStartupVids( void );
long SCR_GetAudioChunk( char *rawdata, long length );
wavdata_t *SCR_GetMovieInfo( void );
void SCR_Shutdown( void );
void Con_Print( const char *txt );
void Con_NPrintf( int idx, char *fmt, ... );
void Con_NXPrintf( con_nprint_t *info, char *fmt, ... );
void UI_NPrintf( int idx, char *fmt, ... );
void UI_NXPrintf( con_nprint_t *info, char *fmt, ... );
char *Info_ValueForKey( const char *s, const char *key );
void Info_RemovePrefixedKeys( char *start, char prefix );
qboolean Info_RemoveKey( char *s, const char *key );
qboolean Info_SetValueForKey( char *s, const char *key, const char *value, int maxsize );
qboolean Info_SetValueForStarKey( char *s, const char *key, const char *value, int maxsize );
qboolean Info_IsValid( const char *s );
void Info_WriteVars( file_t *f );
void Info_Print( const char *s );
void Cmd_WriteVariables( file_t *f );
qboolean Cmd_CheckMapsList( qboolean fRefresh );
qboolean Cmd_AutocompleteName( const char *source, char *buffer, size_t bufsize );
void Cmd_AutoComplete( char *complete_string );
void COM_SetRandomSeed( long lSeed );
long COM_RandomLong( long lMin, long lMax );
float COM_RandomFloat( float fMin, float fMax );
qboolean LZSS_IsCompressed( const byte *source );
uint LZSS_GetActualSize( const byte *source );
byte *LZSS_Compress( byte *pInput, int inputLength, uint *pOutputSize );
uint LZSS_Decompress( const byte *pInput, byte *pOutput );
const byte *GL_TextureData( unsigned int texnum );
void GL_FreeImage( const char *name );
void VID_InitDefaultResolution( void );
void UI_SetActiveMenu( qboolean fActive );
void Cmd_Null_f( void );

// soundlib shared exports
qboolean S_Init( void );
void S_Shutdown( void );
void S_Activate( qboolean active );
void S_StopSound( int entnum, int channel, const char *soundname );
int S_GetCurrentStaticSounds( soundlist_t *pout, int size );
void S_StopBackgroundTrack( void );
void S_StopAllSounds( qboolean ambient );

// gamma routines
void BuildGammaTable( float gamma, float brightness );
byte LightToTexGamma( byte b );
byte TextureToGamma( byte b );

//
// identification.c
//
void ID_Init( void );
const char *ID_GetMD5( void );
void GAME_EXPORT ID_SetCustomClientID( const char *id );

#ifdef __cplusplus
}
#endif
#endif//COMMON_H