/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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 2 of the License,
or (at your option) any later version.

Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
//

// cg_public.h -- engine calls and types exposed to the cgame module
// A user mod should never modify this file

#include "../qcommon/tr_types.h"


#define	MAX_ENTITIES_IN_SNAPSHOT	256

// snapshots are a view of the server at a given time

// Snapshots are generated at regular time intervals by the server,
// but they may not be sent if a client's rate level is exceeded,
// and they may be dropped by the network.
typedef struct {
	int				snapFlags;			// SNAPFLAG_RATE_DELAYED, etc
	int				ping;

	int				serverTime;		// server time the message is valid for (in msec)

	byte			areamask[MAX_MAP_AREA_BYTES];		// portalarea visibility bits

	playerState_t	ps;						// complete information about the current player at this time

	int				numEntities;			// all of the entities that need to be presented
	entityState_t	entities[MAX_ENTITIES_IN_SNAPSHOT];	// at the time of this snapshot

	int				numServerCommands;		// text based server commands to execute when this
	int				serverCommandSequence;	// snapshot becomes current
} snapshot_t;


// allow a lot of command backups for very fast systems
// multiple commands may be combined into a single packet, so this
// needs to be larger than PACKET_BACKUP
#define	CMD_BACKUP		64
#define	CMD_MASK		(CMD_BACKUP - 1)


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

functions imported from the main executable

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

#define	CGAME_IMPORT_API_VERSION	4

typedef enum {
	CG_PRINT,
	CG_ERROR,
	CG_MILLISECONDS,
	CG_CVAR_REGISTER,
	CG_CVAR_UPDATE,
	CG_CVAR_SET,
	CG_CVAR_VARIABLESTRINGBUFFER,
	CG_ARGC,
	CG_ARGV,
	CG_ARGS,
	CG_FS_FOPENFILE,
	CG_FS_READ,
	CG_FS_WRITE,
	CG_FS_FCLOSEFILE,
	CG_SENDCONSOLECOMMAND,
	CG_ADDCOMMAND,
	CG_SENDCLIENTCOMMAND,
	CG_UPDATESCREEN,
	CG_CM_LOADMAP,
	CG_CM_NUMINLINEMODELS,
	CG_CM_INLINEMODEL,
	CG_CM_LOADMODEL,
	CG_CM_TEMPBOXMODEL,
	CG_CM_POINTCONTENTS,
	CG_CM_TRANSFORMEDPOINTCONTENTS,
	CG_CM_BOXTRACE,
	CG_CM_TRANSFORMEDBOXTRACE,
	CG_CM_MARKFRAGMENTS,
	CG_S_STARTSOUND,
	CG_S_STARTLOCALSOUND,
	CG_S_CLEARLOOPINGSOUNDS,
	CG_S_ADDLOOPINGSOUND,
	CG_S_UPDATEENTITYPOSITION,
	CG_S_RESPATIALIZE,
	CG_S_REGISTERSOUND,
	CG_S_STARTBACKGROUNDTRACK,
	CG_R_LOADWORLDMAP,
	CG_R_REGISTERMODEL,
	CG_R_REGISTERSKIN,
	CG_R_REGISTERSHADER,
	CG_R_CLEARSCENE,
	CG_R_ADDREFENTITYTOSCENE,
	CG_R_ADDPOLYTOSCENE,
	DO_NOT_WANT_CG_R_ADDDEFECTIVELIGHTTOSCENE,
	CG_R_RENDERSCENE,
	CG_R_SETCOLOR,
	CG_R_DRAWSTRETCHPIC,
	CG_R_MODELBOUNDS,
	CG_R_LERPTAG,
	CG_GETGLCONFIG,
	CG_GETGAMESTATE,
	CG_GETCURRENTSNAPSHOTNUMBER,
	CG_GETSNAPSHOT,
	CG_GETSERVERCOMMAND,
	CG_GETCURRENTCMDNUMBER,
	CG_GETUSERCMD,
	CG_SETUSERCMDVALUE,
	CG_R_REGISTERSHADERNOMIP,
	CG_MEMORY_REMAINING,
	CG_R_REGISTERFONT,
	CG_KEY_ISDOWN,
	CG_KEY_GETCATCHER,
	CG_KEY_SETCATCHER,
	CG_KEY_GETKEY,
	DO_NOT_WANT_CG_PC_ADD_GLOBAL_DEFINE,
	DO_NOT_WANT_CG_PC_LOAD_SOURCE,
	DO_NOT_WANT_CG_PC_FREE_SOURCE,
	DO_NOT_WANT_CG_PC_READ_TOKEN,
	DO_NOT_WANT_CG_PC_SOURCE_FILE_AND_LINE,
	CG_S_STOPBACKGROUNDTRACK,
	CG_REAL_TIME,
	DO_NOT_WANT_CG_SNAPVECTOR,
	CG_REMOVECOMMAND,
	CG_R_LIGHTFORPOINT,
	CG_CIN_PLAYCINEMATIC,
	CG_CIN_STOPCINEMATIC,
	CG_CIN_RUNCINEMATIC,
	CG_CIN_DRAWCINEMATIC,
	CG_CIN_SETEXTENTS,
	DO_NOT_WANT_CG_R_REMAP_SHADER,
	DO_NOT_WANT_CG_S_ADDREALLOOPINGSOUND,
	DO_NOT_WANT_CG_S_STOPLOOPINGSOUND,

	CG_CM_TEMPCAPSULEMODEL,
	CG_CM_CAPSULETRACE,
	CG_CM_TRANSFORMEDCAPSULETRACE,
	CG_R_ADDLIGHTTOSCENE,
	CG_GET_ENTITY_TOKEN,
	CG_R_ADDPOLYSTOSCENE,
	CG_R_INPVS,
	// 1.32
	CG_FS_SEEK,


	CG_MEMSET = 100,
	CG_MEMCPY,
	CG_STRNCPY,
	CG_SIN,
	CG_COS,
	CG_ATAN2,
	CG_SQRT,
	CG_FLOOR,
	CG_CEIL,
	DO_NOT_WANT_CG_TESTPRINTINT,
	DO_NOT_WANT_CG_TESTPRINTFLOAT,
	CG_ACOS,

	// engine extensions
	// the mod should _never_ use these symbols
	CG_EXT_GETVALUE = 700,
	CG_EXT_LOCATEINTEROPDATA,
	CG_EXT_R_ADDREFENTITYTOSCENE2,
	CG_EXT_R_FORCEFIXEDDLIGHTS,
	CG_EXT_SETINPUTFORWARDING,
	CG_EXT_CVAR_SETRANGE,
	CG_EXT_CVAR_SETHELP,
	CG_EXT_CMD_SETHELP,
	CG_EXT_MATCHALERTEVENT,
	CG_EXT_ERROR2
} cgameImport_t;


//
// system traps
// These functions are how the cgame communicates with the main game system
//

// print message on the local console
void		trap_Print( const char *fmt );

// abort the game
void		trap_Error( const char *fmt );

// milliseconds should only be used for performance tuning, never
// for anything game related.  Get time from the CG_DrawActiveFrame parameter
int			trap_Milliseconds( void );

int			trap_RealTime( qtime_t* qtime );

// console variable interaction
void		trap_Cvar_Register( vmCvar_t *vmCvar, const char *varName, const char *defaultValue, int flags );
void		trap_Cvar_Update( vmCvar_t *vmCvar );
void		trap_Cvar_Set( const char *var_name, const char *value );
void		trap_Cvar_VariableStringBuffer( const char *var_name, char *buffer, int bufsize );

// ServerCommand and ConsoleCommand parameter access
int			trap_Argc( void );
void		trap_Argv( int n, char *buffer, int bufferLength );
void		trap_Args( char *buffer, int bufferLength );

// filesystem access
// returns length of file
int			trap_FS_FOpenFile( const char *qpath, fileHandle_t *f, fsMode_t mode );
void		trap_FS_Read( void *buffer, int len, fileHandle_t f );
void		trap_FS_Write( const void *buffer, int len, fileHandle_t f );
void		trap_FS_FCloseFile( fileHandle_t f );
int			trap_FS_Seek( fileHandle_t f, long offset, fsOrigin_t origin );

// add commands to the local console as if they were typed in
// for map changing, etc.  The command is not executed immediately,
// but will be executed in order the next time console commands
// are processed
void		trap_SendConsoleCommand( const char *text );

// register a command name so the console can perform command completion.
// FIXME: replace this with a normal console command "defineCommand"?
void		trap_AddCommand( const char *cmdName );
void		trap_RemoveCommand( const char *cmdName );

// send a string to the server over the network
void		trap_SendClientCommand( const char *s );

// force a screen update, only used during gamestate load
void		trap_UpdateScreen( void );

// model collision
void		trap_CM_LoadMap( const char *mapname );
int			trap_CM_NumInlineModels( void );
clipHandle_t trap_CM_InlineModel( int index );		// 0 = world, 1+ = bmodels
clipHandle_t trap_CM_TempBoxModel( const vec3_t mins, const vec3_t maxs );
int			trap_CM_PointContents( const vec3_t p, clipHandle_t model );
int			trap_CM_TransformedPointContents( const vec3_t p, clipHandle_t model, const vec3_t origin, const vec3_t angles );
void		trap_CM_BoxTrace( trace_t *results, const vec3_t start, const vec3_t end,
					  const vec3_t mins, const vec3_t maxs,
					  clipHandle_t model, int brushmask );
void		trap_CM_TransformedBoxTrace( trace_t *results, const vec3_t start, const vec3_t end,
					  const vec3_t mins, const vec3_t maxs,
					  clipHandle_t model, int brushmask,
					  const vec3_t origin, const vec3_t angles );

// Returns the projection of a polygon onto the solid brushes in the world
int			trap_CM_MarkFragments( int numPoints, const vec3_t *points, 
			const vec3_t projection,
			int maxPoints, vec3_t pointBuffer,
			int maxFragments, markFragment_t *fragmentBuffer );


// normal sounds will have their volume dynamically changed as their entity
// moves and the listener moves
void		trap_S_StartSound( const vec3_t origin, int entityNum, int entchannel, sfxHandle_t sfx );
void		trap_S_StopLoopingSound( int entnum );

// a local sound is always played full volume
void		trap_S_StartLocalSound( sfxHandle_t sfx, int channelNum );
void		trap_S_UpdateEntityPosition( int entityNum, const vec3_t origin );

// respatialize recalculates the volumes of sound as they should be heard by the
// given entityNum and position
void		trap_S_Respatialize( int entityNum, const vec3_t origin, vec3_t axis[3], int inwater );
void		trap_S_StartBackgroundTrack( const char *intro, const char *loop );	// empty name stops music
void		trap_S_StopBackgroundTrack( void );

// we can't fix the signatures of shitty traps without losing idq3 compatibility
// but we can at least stop them from "poisoning" mod code
// make it impossible for mods to accidentally call them
#if !defined(Q3_VM)
sfxHandle_t	shit_S_RegisterSound( const char* sample, qboolean ignored );
void		shit_S_ClearLoopingSounds( qboolean ignored );
void		shit_S_AddLoopingSound( int entityNum, const vec3_t origin, const vec3_t ignored, sfxHandle_t sfx );
#endif
#define		trap_S_RegisterSound( x ) shit_S_RegisterSound( x, qfalse )
#define		trap_S_ClearLoopingSounds() shit_S_ClearLoopingSounds( qfalse )
#define		trap_S_AddLoopingSound( n, o, s ) shit_S_AddLoopingSound( n, o, vec3_origin, s )


void		trap_R_LoadWorldMap( const char *mapname );

// all media should be registered during level startup to prevent
// hitches during gameplay
qhandle_t	trap_R_RegisterModel( const char *name );			// returns rgb axis if not found
qhandle_t	trap_R_RegisterSkin( const char *name );			// returns all white if not found
qhandle_t	trap_R_RegisterShader( const char *name );			// returns all white if not found
qhandle_t	trap_R_RegisterShaderNoMip( const char *name );			// returns all white if not found

// a scene is built up by calls to R_ClearScene and the various R_Add functions.
// Nothing is drawn until R_RenderScene is called.
void		trap_R_ClearScene( void );
void		trap_R_AddRefEntityToScene( const refEntity_t *re );

// polys are intended for simple wall marks, not really for doing
// significant construction
void		trap_R_AddPolyToScene( qhandle_t hShader, int numVerts, const polyVert_t *verts );
void		trap_R_AddPolysToScene( qhandle_t hShader, int numVerts, const polyVert_t *verts, int numPolys );
void		trap_R_AddLightToScene( const vec3_t org, float radius, float r, float g, float b );
int			trap_R_LightForPoint( vec3_t point, vec3_t ambientLight, vec3_t directedLight, vec3_t lightDir );
void		trap_R_RenderScene( const refdef_t *fd );
void		trap_R_SetColor( const float *rgba );	// NULL = 1,1,1,1
void		trap_R_DrawStretchPic( float x, float y, float w, float h,
				float s1, float t1, float s2, float t2, qhandle_t hShader );
void		trap_R_ModelBounds( clipHandle_t model, vec3_t mins, vec3_t maxs );
int			trap_R_LerpTag( orientation_t *tag, clipHandle_t mod, int startFrame, int endFrame,
				float frac, const char *tagName );

// The glconfig_t will not change during the life of a cgame.
// If it needs to change, the entire cgame will be restarted, because
// all the qhandle_t are then invalid.
void		trap_GetGlconfig( glconfig_t *glconfig );

// the gamestate should be grabbed at startup, and whenever a
// configstring changes
void		trap_GetGameState( gameState_t *gamestate );

// cgame will poll each frame to see if a newer snapshot has arrived
// that it is interested in.  The time is returned seperately so that
// snapshot latency can be calculated.
void		trap_GetCurrentSnapshotNumber( int *snapshotNumber, int *serverTime );

// a snapshot get can fail if the snapshot (or the entities it holds) is so
// old that it has fallen out of the client system queue
qboolean	trap_GetSnapshot( int snapshotNumber, snapshot_t *snapshot );

// retrieve a text command from the server stream
// the current snapshot will hold the number of the most recent command
// qfalse can be returned if the client system handled the command
// argc() / argv() can be used to examine the parameters of the command
qboolean	trap_GetServerCommand( int serverCommandNumber );

// returns the most recent command number that can be passed to GetUserCmd
// this will always be at least one higher than the number in the current
// snapshot, and it may be quite a few higher if it is a fast computer on
// a lagged connection
int			trap_GetCurrentCmdNumber( void );

qboolean	trap_GetUserCmd( int cmdNumber, usercmd_t *ucmd );

// used for the weapon select and zoom
void		trap_SetUserCmdValue( int stateValue, float sensitivityScale );

int			trap_MemoryRemaining( void );
qboolean	trap_R_RegisterFont( const char* fontName, int pointSize, fontInfo_t* font );
qboolean	trap_Key_IsDown( int keynum );
int			trap_Key_GetCatcher( void );
void		trap_Key_SetCatcher( int catcher );
int			trap_Key_GetKey( const char *binding );


int trap_CIN_PlayCinematic( const char *arg0, int xpos, int ypos, int width, int height, int bits);
e_status trap_CIN_StopCinematic(int handle);
e_status trap_CIN_RunCinematic (int handle);
void trap_CIN_DrawCinematic (int handle);
void trap_CIN_SetExtents (int handle, int x, int y, int w, int h);

qboolean trap_R_inPVS( const vec3_t p1, const vec3_t p2 );


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

functions exported to the main executable

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

typedef enum {
	CG_INIT,
//	void CG_Init( int serverMessageNum, int serverCommandSequence, int clientNum )
	// called when the level loads or when the renderer is restarted
	// all media should be registered at this time
	// cgame will display loading status by calling SCR_Update, which
	// will call CG_DrawInformation during the loading process
	// reliableCommandSequence will be 0 on fresh loads, but higher for
	// demos, tourney restarts, or vid_restarts

	CG_SHUTDOWN,
//	void (*CG_Shutdown)( void );
	// oportunity to flush and close any open files

	CG_CONSOLE_COMMAND,
//	qboolean (*CG_ConsoleCommand)( void );
	// a console command has been issued locally that is not recognized by the
	// main game system.
	// use Cmd_Argc() / Cmd_Argv() to read the command, return qfalse if the
	// command is not known to the game

	CG_DRAW_ACTIVE_FRAME,
//	void (*CG_DrawActiveFrame)( int serverTime, stereoFrame_t stereoView, qboolean demoPlayback );
	// Generates and draws a game scene and status information at the given time.
	// If demoPlayback is set, local movement prediction will not be enabled

	CG_CROSSHAIR_PLAYER,
//	int (*CG_CrosshairPlayer)( void );

	CG_LAST_ATTACKER,
//	int (*CG_LastAttacker)( void );

	CG_KEY_EVENT,
//	void	(*CG_KeyEvent)( int key, qboolean down );

	CG_MOUSE_EVENT,
//	void	(*CG_MouseEvent)( int dx, int dy );
	CG_EVENT_HANDLING
//	void (*CG_EventHandling)(int type);
} cgameExport_t;