/*
	protocol.h

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.

	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 2
	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.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
// protocol.h -- communications protocols

#ifndef __qw_protocol_h
#define __qw_protocol_h

#include "QF/mathlib.h"

#include "gamedefs.h"

#define	PROTOCOL_VERSION	28

#define QW_CHECK_HASH 0x5157

// =========================================

#define	PORT_CLIENT	"27001"
#define	PORT_MASTER	27000
#define	PORT_SERVER	27500

// =========================================

// out of band message id bytes

// M = master, S = server, C = client, A = any
// the second character will always be \n if the message isn't a single
// byte long (?? not true anymore?)

#define	S2C_CHALLENGE		'c'
#define	S2C_CONNECTION		'j'
#define	A2A_PING			'k'	// respond with an A2A_ACK
#define	A2A_ACK				'l'	// general acknowledgement without info
#define	A2A_NACK			'm'	// [+ comment] general failure
#define A2A_ECHO			'e' // for echoing
#define	A2C_PRINT			'n'	// print a message on client

#define	S2M_HEARTBEAT		'a'	// + serverinfo + userlist + fraglist
#define	A2C_CLIENT_COMMAND	'B'	// + command line
#define	S2M_SHUTDOWN		'C'

#define M2C_MASTER_REPLY	'd'	// + \n + qw server port list

//==================
// note that there are some defs.qc that mirror to these numbers
// also related to svc_strings[] in cl_parse
//==================

// server to client ===========================================================

#define	svc_bad				0
#define	svc_nop				1
#define	svc_disconnect		2
#define	svc_updatestat		3	// [byte] [byte]
#define	svc_setview			5	// [short] entity number
#define	svc_sound			6	// <see code>
#define	svc_print			8	// [byte] id [string] null terminated string
#define	svc_stufftext		9	// [string] stuffed into client's console buffer
								// the string should be \n terminated
#define	svc_setangle		10	// [angle3] set the view angle to this absolute value
#define svc_serverdata		11	// [long] protocol ...
#define	svc_lightstyle		12	// [byte] [string]
#define	svc_updatefrags		14	// [byte] [short]
#define	svc_stopsound		16	// <see code>
#define svc_damage			19
#define	svc_spawnstatic		20
#define	svc_spawnbaseline	22
#define	svc_temp_entity		23	// variable
#define	svc_setpause		24	// [byte] on / off
#define	svc_centerprint		26	// [string] to put in center of the screen
#define	svc_killedmonster	27
#define	svc_foundsecret		28
#define	svc_spawnstaticsound	29	// [coord3] [byte] samp [byte] vol [byte] aten
#define	svc_intermission	30		// [vec3_t] origin [vec3_t] angle
#define	svc_finale			31		// [string] text
#define svc_cdtrack			32		// [byte] track
#define svc_sellscreen		33
#define	svc_smallkick		34		// set client punchangle to 2
#define	svc_bigkick			35		// set client punchangle to 4
#define	svc_updateping		36		// [byte] [short]
#define	svc_updateentertime	37		// [byte] [float]
#define	svc_updatestatlong	38		// [byte] [long]
#define	svc_muzzleflash		39		// [short] entity
#define	svc_updateuserinfo	40		// [byte] slot [long] uid [string] userinfo
#define	svc_download		41		// [short] size [size bytes]
#define	svc_playerinfo		42		// variable
#define	svc_nails			43		// [byte] num [48 bits] xyzpy 12 12 12 4 8
#define	svc_chokecount		44		// [byte] packets choked
#define	svc_modellist		45		// [strings]
#define	svc_soundlist		46		// [strings]
#define	svc_packetentities	47		// [...]
#define	svc_deltapacketentities	48		// [...]
#define svc_maxspeed		49		// maxspeed change, for prediction
#define svc_entgravity		50		// gravity change, for prediction
#define svc_setinfo			51		// setinfo on a client
#define svc_serverinfo		52		// serverinfo
#define svc_updatepl		53		// [byte] [byte]
#define svc_nails2          54      // FIXME: from qwex. for interpolation, stores edict num

#define DL_NOFILE		-1
#define DL_RENAME		-2
#define DL_HTTP			-3

// client to server ===========================================================

#define	clc_bad			0
#define	clc_nop 		1
//define	clc_doublemove	2
#define	clc_move		3		// [usercmd_t]
#define	clc_stringcmd	4		// [string] message
#define	clc_delta		5		// [byte] sequence number, requests delta compression of message
#define clc_tmove		6		// teleport request, spectator only
#define clc_upload		7		// teleport request, spectator only

// qtv ========================================================================

#define qtv_bad			0
#define qtv_nop			1
#define qtv_stringcmd	2		// [string] message
#define qtv_delta		3		// [byte] sequence number, requests delta
								// compression of message
#define qtv_packet		4		// [short] len/type encoding followed by len
								// bytes of packet data
#define qtv_disconnect	5

#define qtv_p_signon	0x0000
#define qtv_p_print		0x1000
#define qtv_p_reliable	0x2000	// data would have been sent reliably
#define qtv_p_unreliable 0x3000	// data would have been sent unreliably

// demo recording

#define dem_cmd         0
#define dem_read        1
#define dem_set         2
#define dem_multiple    3
#define dem_single      4
#define dem_stats       5
#define dem_all         6

#define DF_ORIGIN   1
#define DF_ANGLES   (1<<3)
#define DF_EFFECTS  (1<<6)
#define DF_SKINNUM  (1<<7)
#define DF_DEAD     (1<<8)
#define DF_GIB      (1<<9)
#define DF_WEAPONFRAME (1<<10)
#define DF_MODEL    (1<<11)

// ==============================================

// playerinfo flags from server
// playerinfo always sends: playernum, flags, origin[] and framenumber

#define	PF_MSEC			(1<<0)
#define	PF_COMMAND		(1<<1)
#define	PF_VELOCITY1	(1<<2)
#define	PF_VELOCITY2	(1<<3)
#define	PF_VELOCITY3	(1<<4)
#define	PF_MODEL		(1<<5)
#define	PF_SKINNUM		(1<<6)
#define	PF_EFFECTS		(1<<7)
#define	PF_WEAPONFRAME	(1<<8)		// sent for only view player
#define	PF_DEAD			(1<<9)		// don't block movement any more
#define	PF_GIB			(1<<10)		// offset the view height differently
#define	PF_NOGRAV		(1<<11)		// don't apply gravity for prediction

#define PF_QF			(1<<12)		// QF QSG extension bits for players

#define PF_ALPHA		(1<<0)
#define PF_SCALE		(1<<1)
#define PF_EFFECTS2		(1<<2)
#define PF_GLOWSIZE		(1<<3)
#define PF_GLOWCOLOR	(1<<4)
#define PF_COLORMOD		(1<<5)
#define PF_FRAME2		(1<<6)

// ==============================================

// if the high bit of the client to server byte is set, the low bits are
// client move cmd bits
// msec is always sent, the others are optional
#define	CM_ANGLE1 	(1<<0)
#define	CM_ANGLE3 	(1<<1)
#define	CM_FORWARD	(1<<2)
#define	CM_SIDE		(1<<3)
#define	CM_UP		(1<<4)
#define	CM_BUTTONS	(1<<5)
#define	CM_IMPULSE	(1<<6)
#define	CM_ANGLE2 	(1<<7)

// ==============================================

// the first 16 bits of a packetentities update holds 9 bits
// of entity number and 7 bits of flags
#define	U_ORIGIN1	(1<<9)
#define	U_ORIGIN2	(1<<10)
#define	U_ORIGIN3	(1<<11)
#define	U_ANGLE2	(1<<12)
#define	U_FRAME		(1<<13)
#define	U_REMOVE	(1<<14)		// REMOVE this entity, don't add it
#define	U_MOREBITS	(1<<15)

// if MOREBITS is set, these additional flags are read in next
#define	U_ANGLE1	(1<<0)
#define	U_ANGLE3	(1<<1)
#define	U_MODEL		(1<<2)
#define	U_COLORMAP	(1<<3)
#define	U_SKIN		(1<<4)
#define	U_EFFECTS	(1<<5)
#define	U_SOLID		(1<<6)		// the entity should be solid for prediction

// QSG Protocol Extensions (Version 2) ========================================
// Network definitions for the engine

#define U_EXTEND1	(1<<7)

// LordHavoc: would be U_DELTA here (as in DarkPlaces), but in QW everything is delta compressed...
#define U_ALPHA		(1<<17) // 1 byte, 0.0-1.0 = 0-255 (Unsent if 1)
#define U_SCALE		(1<<18) // 1 byte, scale / 16 positive, (Unsent if 1)
#define U_EFFECTS2	(1<<19) // 1 byte, .effects & 0xFF00
#define U_GLOWSIZE	(1<<20) // 1 byte, float/8.0, signed. Unsent if 1
#define U_GLOWCOLOR	(1<<21) // 1 byte, palette index, default, 254.
#define U_COLORMOD	(1<<22) // 1 byte, rrrgggbb. Model tinting
#define U_EXTEND2	(1<<23) // Another byte to follow

#define U_GLOWTRAIL	(1<<24) // Leave U_GLOW* trail
#define U_VIEWMODEL	(1<<25) // Attach model to view (relative). Owner only
#define U_FRAME2	(1<<26) // 1 byte .frame & 0xFF00 (second byte)
#define U_UNUSED27	(1<<27) // future expansion
#define U_UNUSED28	(1<<28) // future expansion
#define U_UNUSED29	(1<<29) // future expansion
#define U_UNUSED30	(1<<30) // future expansion
#define U_EXTEND3	(1<<31) // another byte to follow, future expansion

// ============================================================================

// a sound with no channel is a local-only sound
// the sound field has bits 0-2: channel, 3-12: entity
#define	SND_VOLUME		(1<<15)		// a byte
#define	SND_ATTENUATION	(1<<14)		// a byte
#define DEFAULT_SOUND_PACKET_VOLUME 255
#define DEFAULT_SOUND_PACKET_ATTENUATION 1.0

// svc_print messages have an id, so messages can be filtered
#define	PRINT_LOW			0
#define	PRINT_MEDIUM		1
#define	PRINT_HIGH			2
#define	PRINT_CHAT			3	// also go to chat buffer


// temp entity events =========================================================

#define	TE_SPIKE			0
#define	TE_SUPERSPIKE		1
#define	TE_GUNSHOT			2
#define	TE_EXPLOSION		3
#define	TE_TAREXPLOSION		4
#define	TE_LIGHTNING1		5
#define	TE_LIGHTNING2		6
#define	TE_WIZSPIKE			7
#define	TE_KNIGHTSPIKE		8
#define	TE_LIGHTNING3		9
#define	TE_LAVASPLASH		10
#define	TE_TELEPORT			11
#define	TE_BLOOD			12
#define	TE_LIGHTNINGBLOOD	13
#define TE_EXPLOSION2       16
#define TE_BEAM             17			// PGM 01/21/97

#define	DEFAULT_VIEWHEIGHT	22

// ELEMENTS COMMUNICATED ACROSS THE NET =======================================

#define	MAX_CLIENTS		MAX_PLAYERS

#define	UPDATE_BACKUP	64	// copies of entity_state_t to keep buffered
							// must be power of two
#define	UPDATE_MASK		(UPDATE_BACKUP-1)

#include "client/entities.h"	// for entity_state_t

#define	MAX_PACKET_ENTITIES			64	// doesn't count nails
#define	MAX_DEMO_PACKET_ENTITIES	196	// doesn't count nails
typedef struct {
	int         num_entities;
	int         ent_nums[MAX_DEMO_PACKET_ENTITIES];
	entity_state_t *entities;
} packet_entities_t;

typedef struct usercmd_s {
	byte        msec;
	byte        padding[3];	// make sure non-aligning compilers get it right
	vec3_t      angles;
	short       forwardmove, sidemove, upmove;
	byte        buttons;
	byte        impulse;
} usercmd_t;

typedef struct plent_state_s {
	entity_state_t es;
	usercmd_t   cmd;
	byte        msec;
} plent_state_t;

typedef struct {
	int		    num_players;
	plent_state_t *players;
} packet_players_t;

#endif//__qw_protocol_h
