g_weapon.c

quakeIII源码这个不用我多说吧

/*
===========================================================================
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 Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
//
// g_weapon.c 
// perform the server side effects of a weapon firing

#include "g_local.h"

static	float	s_quadFactor;
static	vec3_t	forward, right, up;
static	vec3_t	muzzle;

#define NUM_NAILSHOTS 15

/*
================
G_BounceProjectile
================
*/
void G_BounceProjectile( vec3_t start, vec3_t impact, vec3_t dir, vec3_t endout ) {
	vec3_t v, newv;
	float dot;

	VectorSubtract( impact, start, v );
	dot = DotProduct( v, dir );
	VectorMA( v, -2*dot, dir, newv );

	VectorNormalize(newv);
	VectorMA(impact, 8192, newv, endout);
}


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

GAUNTLET

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

void Weapon_Gauntlet( gentity_t *ent ) {

}

/*
===============
CheckGauntletAttack
===============
*/
qboolean CheckGauntletAttack( gentity_t *ent ) {
	trace_t		tr;
	vec3_t		end;
	gentity_t	*tent;
	gentity_t	*traceEnt;
	int			damage;

	// set aiming directions
	AngleVectors (ent->client->ps.viewangles, forward, right, up);

	CalcMuzzlePoint ( ent, forward, right, up, muzzle );

	VectorMA (muzzle, 32, forward, end);

	trap_Trace (&tr, muzzle, NULL, NULL, end, ent->s.number, MASK_SHOT);
	if ( tr.surfaceFlags & SURF_NOIMPACT ) {
		return qfalse;
	}

	traceEnt = &g_entities[ tr.entityNum ];

	// send blood impact
	if ( traceEnt->takedamage && traceEnt->client ) {
		tent = G_TempEntity( tr.endpos, EV_MISSILE_HIT );
		tent->s.otherEntityNum = traceEnt->s.number;
		tent->s.eventParm = DirToByte( tr.plane.normal );
		tent->s.weapon = ent->s.weapon;
	}

	if ( !traceEnt->takedamage) {
		return qfalse;
	}

	if (ent->client->ps.powerups[PW_QUAD] ) {
		G_AddEvent( ent, EV_POWERUP_QUAD, 0 );
		s_quadFactor = g_quadfactor.value;
	} else {
		s_quadFactor = 1;
	}
#ifdef MISSIONPACK
	if( ent->client->persistantPowerup && ent->client->persistantPowerup->item && ent->client->persistantPowerup->item->giTag == PW_DOUBLER ) {
		s_quadFactor *= 2;
	}
#endif

	damage = 50 * s_quadFactor;
	G_Damage( traceEnt, ent, ent, forward, tr.endpos,
		damage, 0, MOD_GAUNTLET );

	return qtrue;
}


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

MACHINEGUN

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

/*
======================
SnapVectorTowards

Round a vector to integers for more efficient network
transmission, but make sure that it rounds towards a given point
rather than blindly truncating.  This prevents it from truncating 
into a wall.
======================
*/
void SnapVectorTowards( vec3_t v, vec3_t to ) {
	int		i;

	for ( i = 0 ; i < 3 ; i++ ) {
		if ( to[i] <= v[i] ) {
			v[i] = (int)v[i];
		} else {
			v[i] = (int)v[i] + 1;
		}
	}
}

#ifdef MISSIONPACK
#define CHAINGUN_SPREAD		600
#endif
#define MACHINEGUN_SPREAD	200
#define	MACHINEGUN_DAMAGE	7
#define	MACHINEGUN_TEAM_DAMAGE	5		// wimpier MG in teamplay

void Bullet_Fire (gentity_t *ent, float spread, int damage ) {
	trace_t		tr;
	vec3_t		end;
#ifdef MISSIONPACK
	vec3_t		impactpoint, bouncedir;
#endif
	float		r;
	float		u;
	gentity_t	*tent;
	gentity_t	*traceEnt;
	int			i, passent;

	damage *= s_quadFactor;

	r = random() * M_PI * 2.0f;
	u = sin(r) * crandom() * spread * 16;
	r = cos(r) * crandom() * spread * 16;
	VectorMA (muzzle, 8192*16, forward, end);
	VectorMA (end, r, right, end);
	VectorMA (end, u, up, end);

	passent = ent->s.number;
	for (i = 0; i < 10; i++) {

		trap_Trace (&tr, muzzle, NULL, NULL, end, passent, MASK_SHOT);
		if ( tr.surfaceFlags & SURF_NOIMPACT ) {
			return;
		}

		traceEnt = &g_entities[ tr.entityNum ];

		// snap the endpos to integers, but nudged towards the line
		SnapVectorTowards( tr.endpos, muzzle );

		// send bullet impact
		if ( traceEnt->takedamage && traceEnt->client ) {
			tent = G_TempEntity( tr.endpos, EV_BULLET_HIT_FLESH );
			tent->s.eventParm = traceEnt->s.number;
			if( LogAccuracyHit( traceEnt, ent ) ) {
				ent->client->accuracy_hits++;
			}
		} else {
			tent = G_TempEntity( tr.endpos, EV_BULLET_HIT_WALL );
			tent->s.eventParm = DirToByte( tr.plane.normal );
		}
		tent->s.otherEntityNum = ent->s.number;

		if ( traceEnt->takedamage) {
#ifdef MISSIONPACK
			if ( traceEnt->client && traceEnt->client->invulnerabilityTime > level.time ) {
				if (G_InvulnerabilityEffect( traceEnt, forward, tr.endpos, impactpoint, bouncedir )) {
					G_BounceProjectile( muzzle, impactpoint, bouncedir, end );
					VectorCopy( impactpoint, muzzle );
					// the player can hit him/herself with the bounced rail
					passent = ENTITYNUM_NONE;
				}
				else {
					VectorCopy( tr.endpos, muzzle );
					passent = traceEnt->s.number;
				}
				continue;
			}
			else {
#endif
				G_Damage( traceEnt, ent, ent, forward, tr.endpos,
					damage, 0, MOD_MACHINEGUN);
#ifdef MISSIONPACK
			}
#endif
		}
		break;
	}
}


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

BFG

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

void BFG_Fire ( gentity_t *ent ) {
	gentity_t	*m;

	m = fire_bfg (ent, muzzle, forward);
	m->damage *= s_quadFactor;
	m->splashDamage *= s_quadFactor;

//	VectorAdd( m->s.pos.trDelta, ent->client->ps.velocity, m->s.pos.trDelta );	// "real" physics
}


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

SHOTGUN

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

// DEFAULT_SHOTGUN_SPREAD and DEFAULT_SHOTGUN_COUNT	are in bg_public.h, because
// client predicts same spreads
#define	DEFAULT_SHOTGUN_DAMAGE	10

qboolean ShotgunPellet( vec3_t start, vec3_t end, gentity_t *ent ) {
	trace_t		tr;
	int			damage, i, passent;
	gentity_t	*traceEnt;
#ifdef MISSIONPACK
	vec3_t		impactpoint, bouncedir;
#endif
	vec3_t		tr_start, tr_end;

	passent = ent->s.number;
	VectorCopy( start, tr_start );
	VectorCopy( end, tr_end );
	for (i = 0; i < 10; i++) {
		trap_Trace (&tr, tr_start, NULL, NULL, tr_end, passent, MASK_SHOT);
		traceEnt = &g_entities[ tr.entityNum ];

		// send bullet impact
		if (  tr.surfaceFlags & SURF_NOIMPACT ) {
			return qfalse;
		}

		if ( traceEnt->takedamage) {
			damage = DEFAULT_SHOTGUN_DAMAGE * s_quadFactor;
#ifdef MISSIONPACK
			if ( traceEnt->client && traceEnt->client->invulnerabilityTime > level.time ) {
				if (G_InvulnerabilityEffect( traceEnt, forward, tr.endpos, impactpoint, bouncedir )) {
					G_BounceProjectile( tr_start, impactpoint, bouncedir, tr_end );
					VectorCopy( impactpoint, tr_start );
					// the player can hit him/herself with the bounced rail
					passent = ENTITYNUM_NONE;
				}
				else {
					VectorCopy( tr.endpos, tr_start );
					passent = traceEnt->s.number;
				}
				continue;
			}
			else {
				G_Damage( traceEnt, ent, ent, forward, tr.endpos,
					damage, 0, MOD_SHOTGUN);
				if( LogAccuracyHit( traceEnt, ent ) ) {
					return qtrue;
				}
			}
#else
			G_Damage( traceEnt, ent, ent, forward, tr.endpos,	damage, 0, MOD_SHOTGUN);
				if( LogAccuracyHit( traceEnt, ent ) ) {
					return qtrue;
				}
#endif
		}
		return qfalse;
	}
	return qfalse;
}

// this should match CG_ShotgunPattern
void ShotgunPattern( vec3_t origin, vec3_t origin2, int seed, gentity_t *ent ) {
	int			i;
	float		r, u;
	vec3_t		end;
	vec3_t		forward, right, up;
	int			oldScore;
	qboolean	hitClient = qfalse;

	// derive the right and up vectors from the forward vector, because
	// the client won't have any other information
	VectorNormalize2( origin2, forward );
	PerpendicularVector( right, forward );
	CrossProduct( forward, right, up );

	oldScore = ent->client->ps.persistant[PERS_SCORE];

	// generate the "random" spread pattern
	for ( i = 0 ; i < DEFAULT_SHOTGUN_COUNT ; i++ ) {
		r = Q_crandom( &seed ) * DEFAULT_SHOTGUN_SPREAD * 16;
		u = Q_crandom( &seed ) * DEFAULT_SHOTGUN_SPREAD * 16;
		VectorMA( origin, 8192 * 16, forward, end);
		VectorMA (end, r, right, end);
		VectorMA (end, u, up, end);
		if( ShotgunPellet( origin, end, ent ) && !hitClient ) {
			hitClient = qtrue;
			ent->client->accuracy_hits++;
		}
	}
}


void weapon_supershotgun_fire (gentity_t *ent) {
	gentity_t		*tent;

	// send shotgun blast
	tent = G_TempEntity( muzzle, EV_SHOTGUN );
	VectorScale( forward, 4096, tent->s.origin2 );
	SnapVector( tent->s.origin2 );
	tent->s.eventParm = rand() & 255;		// seed for spread pattern
	tent->s.otherEntityNum = ent->s.number;

	ShotgunPattern( tent->s.pos.trBase, tent->s.origin2, tent->s.eventParm, ent );
}


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

GRENADE LAUNCHER

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

void weapon_grenadelauncher_fire (gentity_t *ent) {
	gentity_t	*m;

	// extra vertical velocity
	forward[2] += 0.2f;
	VectorNormalize( forward );

	m = fire_grenade (ent, muzzle, forward);
	m->damage *= s_quadFactor;
	m->splashDamage *= s_quadFactor;

//	VectorAdd( m->s.pos.trDelta, ent->client->ps.velocity, m->s.pos.trDelta );	// "real" physics
}

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

ROCKET

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

void Weapon_RocketLauncher_Fire (gentity_t *ent) {
	gentity_t	*m;

	m = fire_rocket (ent, muzzle, forward);
	m->damage *= s_quadFactor;
	m->splashDamage *= s_quadFactor;

//	VectorAdd( m->s.pos.trDelta, ent->client->ps.velocity, m->s.pos.trDelta );	// "real" physics
}


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

PLASMA GUN

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

void Weapon_Plasmagun_Fire (gentity_t *ent) {
	gentity_t	*m;

	m = fire_plasma (ent, muzzle, forward);
	m->damage *= s_quadFactor;
	m->splashDamage *= s_quadFactor;

//	VectorAdd( m->s.pos.trDelta, ent->client->ps.velocity, m->s.pos.trDelta );	// "real" physics
}

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

RAILGUN

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


/*
=================
weapon_railgun_fire
=================
*/
#define	MAX_RAIL_HITS	4
void weapon_railgun_fire (gentity_t *ent) {
	vec3_t		end;
#ifdef MISSIONPACK
	vec3_t impactpoint, bouncedir;
#endif
	trace_t		trace;
	gentity_t	*tent;
	gentity_t	*traceEnt;
	int			damage;
	int			i;
	int			hits;
	int			unlinked;
	int			passent;
	gentity_t	*unlinkedEntities[MAX_RAIL_HITS];

	damage = 100 * s_quadFactor;

	VectorMA (muzzle, 8192, forward, end);

	// trace only against the solids, so the railgun will go through people
	unlinked = 0;
	hits = 0;
	passent = ent->s.number;
	do {
		trap_Trace (&trace, muzzle, NULL, NULL, end, passent, MASK_SHOT );
		if ( trace.entityNum >= ENTITYNUM_MAX_NORMAL ) {
			break;
		}
		traceEnt = &g_entities[ trace.entityNum ];
		if ( traceEnt->takedamage ) {
#ifdef MISSIONPACK
			if ( traceEnt->client && traceEnt->client->invulnerabilityTime > level.time ) {
				if ( G_InvulnerabilityEffect( traceEnt, forward, trace.endpos, impactpoint, bouncedir ) ) {
					G_BounceProjectile( muzzle, impactpoint, bouncedir, end );
					// snap the endpos to integers to save net bandwidth, but nudged towards the line
					SnapVectorTowards( trace.endpos, muzzle );
					// send railgun beam effect
					tent = G_TempEntity( trace.endpos, EV_RAILTRAIL );
					// set player number for custom colors on the railtrail
					tent->s.clientNum = ent->s.clientNum;
					VectorCopy( muzzle, tent->s.origin2 );
					// move origin a bit to come closer to the drawn gun muzzle
					VectorMA( tent->s.origin2, 4, right, tent->s.origin2 );
					VectorMA( tent->s.origin2, -1, up, tent->s.origin2 );
					tent->s.eventParm = 255;	// don't make the explosion at the end
					//
					VectorCopy( impactpoint, muzzle );
					// the player can hit him/herself with the bounced rail
					passent = ENTITYNUM_NONE;
				}
			}
			else {
				if( LogAccuracyHit( traceEnt, ent ) ) {
					hits++;
				}
				G_Damage (traceEnt, ent, ent, forward, trace.endpos, damage, 0, MOD_RAILGUN);
			}
#else
				if( LogAccuracyHit( traceEnt, ent ) ) {
					hits++;
				}
				G_Damage (traceEnt, ent, ent, forward, trace.endpos, damage, 0, MOD_RAILGUN);
#endif
		}
		if ( trace.contents & CONTENTS_SOLID ) {
			break;		// we hit something solid enough to stop the beam
		}
		// unlink this entity, so the next trace will go past it
		trap_UnlinkEntity( traceEnt );
		unlinkedEntities[unlinked] = traceEnt;
		unlinked++;
	} while ( unlinked < MAX_RAIL_HITS );

	// link back in any entities we unlinked
	for ( i = 0 ; i < unlinked ; i++ ) {
		trap_LinkEntity( unlinkedEntities[i] );
	}

	// the final trace endpos will be the terminal point of the rail trail

	// snap the endpos to integers to save net bandwidth, but nudged towards the line
	SnapVectorTowards( trace.endpos, muzzle );

	// send railgun beam effect
	tent = G_TempEntity( trace.endpos, EV_RAILTRAIL );

	// set player number for custom colors on the railtrail
	tent->s.clientNum = ent->s.clientNum;

	VectorCopy( muzzle, tent->s.origin2 );
	// move origin a bit to come closer to the drawn gun muzzle
	VectorMA( tent->s.origin2, 4, right, tent->s.origin2 );
	VectorMA( tent->s.origin2, -1, up, tent->s.origin2 );

	// no explosion at end if SURF_NOIMPACT, but still make the trail
	if ( trace.surfaceFlags & SURF_NOIMPACT ) {
		tent->s.eventParm = 255;	// don't make the explosion at the end
	} else {
		tent->s.eventParm = DirToByte( trace.plane.normal );
	}
	tent->s.clientNum = ent->s.clientNum;

	// give the shooter a reward sound if they have made two railgun hits in a row
	if ( hits == 0 ) {
		// complete miss
		ent->client->accurateCount = 0;
	} else {
		// check for "impressive" reward sound
		ent->client->accurateCount += hits;
		if ( ent->client->accurateCount >= 2 ) {
			ent->client->accurateCount -= 2;
			ent->client->ps.persistant[PERS_IMPRESSIVE_COUNT]++;
			// add the sprite over the player's head
			ent->client->ps.eFlags &= ~(EF_AWARD_IMPRESSIVE | EF_AWARD_EXCELLENT | EF_AWARD_GAUNTLET | EF_AWARD_ASSIST | EF_AWARD_DEFEND | EF_AWARD_CAP );
			ent->client->ps.eFlags |= EF_AWARD_IMPRESSIVE;
			ent->client->rewardTime = level.time + REWARD_SPRITE_TIME;
		}
		ent->client->accuracy_hits++;
	}

}


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

GRAPPLING HOOK

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

void Weapon_GrapplingHook_Fire (gentity_t *ent)
{