cg_weapons.c

quakeIII源码这个不用我多说吧

==============
*/
static void CG_CalculateWeaponPosition( vec3_t origin, vec3_t angles ) {
	float	scale;
	int		delta;
	float	fracsin;

	VectorCopy( cg.refdef.vieworg, origin );
	VectorCopy( cg.refdefViewAngles, angles );

	// on odd legs, invert some angles
	if ( cg.bobcycle & 1 ) {
		scale = -cg.xyspeed;
	} else {
		scale = cg.xyspeed;
	}

	// gun angles from bobbing
	angles[ROLL] += scale * cg.bobfracsin * 0.005;
	angles[YAW] += scale * cg.bobfracsin * 0.01;
	angles[PITCH] += cg.xyspeed * cg.bobfracsin * 0.005;

	// drop the weapon when landing
	delta = cg.time - cg.landTime;
	if ( delta < LAND_DEFLECT_TIME ) {
		origin[2] += cg.landChange*0.25 * delta / LAND_DEFLECT_TIME;
	} else if ( delta < LAND_DEFLECT_TIME + LAND_RETURN_TIME ) {
		origin[2] += cg.landChange*0.25 * 
			(LAND_DEFLECT_TIME + LAND_RETURN_TIME - delta) / LAND_RETURN_TIME;
	}

#if 0
	// drop the weapon when stair climbing
	delta = cg.time - cg.stepTime;
	if ( delta < STEP_TIME/2 ) {
		origin[2] -= cg.stepChange*0.25 * delta / (STEP_TIME/2);
	} else if ( delta < STEP_TIME ) {
		origin[2] -= cg.stepChange*0.25 * (STEP_TIME - delta) / (STEP_TIME/2);
	}
#endif

	// idle drift
	scale = cg.xyspeed + 40;
	fracsin = sin( cg.time * 0.001 );
	angles[ROLL] += scale * fracsin * 0.01;
	angles[YAW] += scale * fracsin * 0.01;
	angles[PITCH] += scale * fracsin * 0.01;
}


/*
===============
CG_LightningBolt

Origin will be the exact tag point, which is slightly
different than the muzzle point used for determining hits.
The cent should be the non-predicted cent if it is from the player,
so the endpoint will reflect the simulated strike (lagging the predicted
angle)
===============
*/
static void CG_LightningBolt( centity_t *cent, vec3_t origin ) {
	trace_t  trace;
	refEntity_t  beam;
	vec3_t   forward;
	vec3_t   muzzlePoint, endPoint;

	if (cent->currentState.weapon != WP_LIGHTNING) {
		return;
	}

	memset( &beam, 0, sizeof( beam ) );

	// CPMA  "true" lightning
	if ((cent->currentState.number == cg.predictedPlayerState.clientNum) && (cg_trueLightning.value != 0)) {
		vec3_t angle;
		int i;

		for (i = 0; i < 3; i++) {
			float a = cent->lerpAngles[i] - cg.refdefViewAngles[i];
			if (a > 180) {
				a -= 360;
			}
			if (a < -180) {
				a += 360;
			}

			angle[i] = cg.refdefViewAngles[i] + a * (1.0 - cg_trueLightning.value);
			if (angle[i] < 0) {
				angle[i] += 360;
			}
			if (angle[i] > 360) {
				angle[i] -= 360;
			}
		}

		AngleVectors(angle, forward, NULL, NULL );
		VectorCopy(cent->lerpOrigin, muzzlePoint );
//		VectorCopy(cg.refdef.vieworg, muzzlePoint );
	} else {
		// !CPMA
		AngleVectors( cent->lerpAngles, forward, NULL, NULL );
		VectorCopy(cent->lerpOrigin, muzzlePoint );
	}

	// FIXME: crouch
	muzzlePoint[2] += DEFAULT_VIEWHEIGHT;

	VectorMA( muzzlePoint, 14, forward, muzzlePoint );

	// project forward by the lightning range
	VectorMA( muzzlePoint, LIGHTNING_RANGE, forward, endPoint );

	// see if it hit a wall
	CG_Trace( &trace, muzzlePoint, vec3_origin, vec3_origin, endPoint, 
		cent->currentState.number, MASK_SHOT );

	// this is the endpoint
	VectorCopy( trace.endpos, beam.oldorigin );

	// use the provided origin, even though it may be slightly
	// different than the muzzle origin
	VectorCopy( origin, beam.origin );

	beam.reType = RT_LIGHTNING;
	beam.customShader = cgs.media.lightningShader;
	trap_R_AddRefEntityToScene( &beam );

	// add the impact flare if it hit something
	if ( trace.fraction < 1.0 ) {
		vec3_t	angles;
		vec3_t	dir;

		VectorSubtract( beam.oldorigin, beam.origin, dir );
		VectorNormalize( dir );

		memset( &beam, 0, sizeof( beam ) );
		beam.hModel = cgs.media.lightningExplosionModel;

		VectorMA( trace.endpos, -16, dir, beam.origin );

		// make a random orientation
		angles[0] = rand() % 360;
		angles[1] = rand() % 360;
		angles[2] = rand() % 360;
		AnglesToAxis( angles, beam.axis );
		trap_R_AddRefEntityToScene( &beam );
	}
}
/*

static void CG_LightningBolt( centity_t *cent, vec3_t origin ) {
	trace_t		trace;
	refEntity_t		beam;
	vec3_t			forward;
	vec3_t			muzzlePoint, endPoint;

	if ( cent->currentState.weapon != WP_LIGHTNING ) {
		return;
	}

	memset( &beam, 0, sizeof( beam ) );

	// find muzzle point for this frame
	VectorCopy( cent->lerpOrigin, muzzlePoint );
	AngleVectors( cent->lerpAngles, forward, NULL, NULL );

	// FIXME: crouch
	muzzlePoint[2] += DEFAULT_VIEWHEIGHT;

	VectorMA( muzzlePoint, 14, forward, muzzlePoint );

	// project forward by the lightning range
	VectorMA( muzzlePoint, LIGHTNING_RANGE, forward, endPoint );

	// see if it hit a wall
	CG_Trace( &trace, muzzlePoint, vec3_origin, vec3_origin, endPoint, 
		cent->currentState.number, MASK_SHOT );

	// this is the endpoint
	VectorCopy( trace.endpos, beam.oldorigin );

	// use the provided origin, even though it may be slightly
	// different than the muzzle origin
	VectorCopy( origin, beam.origin );

	beam.reType = RT_LIGHTNING;
	beam.customShader = cgs.media.lightningShader;
	trap_R_AddRefEntityToScene( &beam );

	// add the impact flare if it hit something
	if ( trace.fraction < 1.0 ) {
		vec3_t	angles;
		vec3_t	dir;

		VectorSubtract( beam.oldorigin, beam.origin, dir );
		VectorNormalize( dir );

		memset( &beam, 0, sizeof( beam ) );
		beam.hModel = cgs.media.lightningExplosionModel;

		VectorMA( trace.endpos, -16, dir, beam.origin );

		// make a random orientation
		angles[0] = rand() % 360;
		angles[1] = rand() % 360;
		angles[2] = rand() % 360;
		AnglesToAxis( angles, beam.axis );
		trap_R_AddRefEntityToScene( &beam );
	}
}
*/

/*
===============
CG_SpawnRailTrail

Origin will be the exact tag point, which is slightly
different than the muzzle point used for determining hits.
===============
*/
static void CG_SpawnRailTrail( centity_t *cent, vec3_t origin ) {
	clientInfo_t	*ci;

	if ( cent->currentState.weapon != WP_RAILGUN ) {
		return;
	}
	if ( !cent->pe.railgunFlash ) {
		return;
	}
	cent->pe.railgunFlash = qtrue;
	ci = &cgs.clientinfo[ cent->currentState.clientNum ];
	CG_RailTrail( ci, origin, cent->pe.railgunImpact );
}


/*
======================
CG_MachinegunSpinAngle
======================
*/
#define		SPIN_SPEED	0.9
#define		COAST_TIME	1000
static float	CG_MachinegunSpinAngle( centity_t *cent ) {
	int		delta;
	float	angle;
	float	speed;

	delta = cg.time - cent->pe.barrelTime;
	if ( cent->pe.barrelSpinning ) {
		angle = cent->pe.barrelAngle + delta * SPIN_SPEED;
	} else {
		if ( delta > COAST_TIME ) {
			delta = COAST_TIME;
		}

		speed = 0.5 * ( SPIN_SPEED + (float)( COAST_TIME - delta ) / COAST_TIME );
		angle = cent->pe.barrelAngle + delta * speed;
	}

	if ( cent->pe.barrelSpinning == !(cent->currentState.eFlags & EF_FIRING) ) {
		cent->pe.barrelTime = cg.time;
		cent->pe.barrelAngle = AngleMod( angle );
		cent->pe.barrelSpinning = !!(cent->currentState.eFlags & EF_FIRING);
#ifdef MISSIONPACK
		if ( cent->currentState.weapon == WP_CHAINGUN && !cent->pe.barrelSpinning ) {
			trap_S_StartSound( NULL, cent->currentState.number, CHAN_WEAPON, trap_S_RegisterSound( "sound/weapons/vulcan/wvulwind.wav", qfalse ) );
		}
#endif
	}

	return angle;
}


/*
========================
CG_AddWeaponWithPowerups
========================
*/
static void CG_AddWeaponWithPowerups( refEntity_t *gun, int powerups ) {
	// add powerup effects
	if ( powerups & ( 1 << PW_INVIS ) ) {
		gun->customShader = cgs.media.invisShader;
		trap_R_AddRefEntityToScene( gun );
	} else {
		trap_R_AddRefEntityToScene( gun );

		if ( powerups & ( 1 << PW_BATTLESUIT ) ) {
			gun->customShader = cgs.media.battleWeaponShader;
			trap_R_AddRefEntityToScene( gun );
		}
		if ( powerups & ( 1 << PW_QUAD ) ) {
			gun->customShader = cgs.media.quadWeaponShader;
			trap_R_AddRefEntityToScene( gun );
		}
	}
}


/*
=============
CG_AddPlayerWeapon

Used for both the view weapon (ps is valid) and the world modelother character models (ps is NULL)
The main player will have this called for BOTH cases, so effects like light and
sound should only be done on the world model case.
=============
*/
void CG_AddPlayerWeapon( refEntity_t *parent, playerState_t *ps, centity_t *cent, int team ) {
	refEntity_t	gun;
	refEntity_t	barrel;
	refEntity_t	flash;
	vec3_t		angles;
	weapon_t	weaponNum;
	weaponInfo_t	*weapon;
	centity_t	*nonPredictedCent;
//	int	col;

	weaponNum = cent->currentState.weapon;

	CG_RegisterWeapon( weaponNum );
	weapon = &cg_weapons[weaponNum];

	// add the weapon
	memset( &gun, 0, sizeof( gun ) );
	VectorCopy( parent->lightingOrigin, gun.lightingOrigin );
	gun.shadowPlane = parent->shadowPlane;
	gun.renderfx = parent->renderfx;

	// set custom shading for railgun refire rate
	if ( ps ) {
		if ( cg.predictedPlayerState.weapon == WP_RAILGUN 
			&& cg.predictedPlayerState.weaponstate == WEAPON_FIRING ) {
			float	f;

			f = (float)cg.predictedPlayerState.weaponTime / 1500;
			gun.shaderRGBA[1] = 0;
			gun.shaderRGBA[0] = 
			gun.shaderRGBA[2] = 255 * ( 1.0 - f );
		} else {
			gun.shaderRGBA[0] = 255;
			gun.shaderRGBA[1] = 255;
			gun.shaderRGBA[2] = 255;
			gun.shaderRGBA[3] = 255;
		}
	}

	gun.hModel = weapon->weaponModel;
	if (!gun.hModel) {
		return;
	}

	if ( !ps ) {
		// add weapon ready sound
		cent->pe.lightningFiring = qfalse;
		if ( ( cent->currentState.eFlags & EF_FIRING ) && weapon->firingSound ) {
			// lightning gun and guantlet make a different sound when fire is held down
			trap_S_AddLoopingSound( cent->currentState.number, cent->lerpOrigin, vec3_origin, weapon->firingSound );
			cent->pe.lightningFiring = qtrue;
		} else if ( weapon->readySound ) {
			trap_S_AddLoopingSound( cent->currentState.number, cent->lerpOrigin, vec3_origin, weapon->readySound );
		}
	}

	CG_PositionEntityOnTag( &gun, parent, parent->hModel, "tag_weapon");

	CG_AddWeaponWithPowerups( &gun, cent->currentState.powerups );

	// add the spinning barrel
	if ( weapon->barrelModel ) {
		memset( &barrel, 0, sizeof( barrel ) );
		VectorCopy( parent->lightingOrigin, barrel.lightingOrigin );
		barrel.shadowPlane = parent->shadowPlane;
		barrel.renderfx = parent->renderfx;

		barrel.hModel = weapon->barrelModel;
		angles[YAW] = 0;
		angles[PITCH] = 0;
		angles[ROLL] = CG_MachinegunSpinAngle( cent );
		AnglesToAxis( angles, barrel.axis );

		CG_PositionRotatedEntityOnTag( &barrel, &gun, weapon->weaponModel, "tag_barrel" );

		CG_AddWeaponWithPowerups( &barrel, cent->currentState.powerups );
	}

	// make sure we aren't looking at cg.predictedPlayerEntity for LG
	nonPredictedCent = &cg_entities[cent->currentState.clientNum];

	// if the index of the nonPredictedCent is not the same as the clientNum
	// then this is a fake player (like on teh single player podiums), so
	// go ahead and use the cent
	if( ( nonPredictedCent - cg_entities ) != cent->currentState.clientNum ) {
		nonPredictedCent = cent;
	}

	// add the flash
	if ( ( weaponNum == WP_LIGHTNING || weaponNum == WP_GAUNTLET || weaponNum == WP_GRAPPLING_HOOK )
		&& ( nonPredictedCent->currentState.eFlags & EF_FIRING ) ) 
	{
		// continuous flash
	} else {
		// impulse flash
		if ( cg.time - cent->muzzleFlashTime > MUZZLE_FLASH_TIME && !cent->pe.railgunFlash ) {
			return;
		}
	}

	memset( &flash, 0, sizeof( flash ) );
	VectorCopy( parent->lightingOrigin, flash.lightingOrigin );
	flash.shadowPlane = parent->shadowPlane;
	flash.renderfx = parent->renderfx;

	flash.hModel = weapon->flashModel;
	if (!flash.hModel) {
		return;
	}
	angles[YAW] = 0;
	angles[PITCH] = 0;
	angles[ROLL] = crandom() * 10;
	AnglesToAxis( angles, flash.axis );

	// colorize the railgun blast
	if ( weaponNum == WP_RAILGUN ) {
		clientInfo_t	*ci;

		ci = &cgs.clientinfo[ cent->currentState.clientNum ];
		flash.shaderRGBA[0] = 255 * ci->color1[0];
		flash.shaderRGBA[1] = 255 * ci->color1[1];
		flash.shaderRGBA[2] = 255 * ci->color1[2];
	}

	CG_PositionRotatedEntityOnTag( &flash, &gun, weapon->weaponModel, "tag_flash");
	trap_R_AddRefEntityToScene( &flash );

	if ( ps || cg.renderingThirdPerson ||
		cent->currentState.number != cg.predictedPlayerState.clientNum ) {
		// add lightning bolt
		CG_LightningBolt( nonPredictedCent, flash.origin );

		// add rail trail
		CG_SpawnRailTrail( cent, flash.origin );

		if ( weapon->flashDlightColor[0] || weapon->flashDlightColor[1] || weapon->flashDlightColor[2] ) {
			trap_R_AddLightToScene( flash.origin, 300 + (rand()&31), weapon->flashDlightColor[0],
				weapon->flashDlightColor[1], weapon->flashDlightColor[2] );
		}
	}
}

/*
==============
CG_AddViewWeapon

Add the weapon, and flash for the player's view