cg_ents.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
===========================================================================
*/
//
// cg_ents.c -- present snapshot entities, happens every single frame

#include "cg_local.h"


/*
======================
CG_PositionEntityOnTag

Modifies the entities position and axis by the given
tag location
======================
*/
void CG_PositionEntityOnTag( refEntity_t *entity, const refEntity_t *parent, 
							qhandle_t parentModel, char *tagName ) {
	int				i;
	orientation_t	lerped;
	
	// lerp the tag
	trap_R_LerpTag( &lerped, parentModel, parent->oldframe, parent->frame,
		1.0 - parent->backlerp, tagName );

	// FIXME: allow origin offsets along tag?
	VectorCopy( parent->origin, entity->origin );
	for ( i = 0 ; i < 3 ; i++ ) {
		VectorMA( entity->origin, lerped.origin[i], parent->axis[i], entity->origin );
	}

	// had to cast away the const to avoid compiler problems...
	MatrixMultiply( lerped.axis, ((refEntity_t *)parent)->axis, entity->axis );
	entity->backlerp = parent->backlerp;
}


/*
======================
CG_PositionRotatedEntityOnTag

Modifies the entities position and axis by the given
tag location
======================
*/
void CG_PositionRotatedEntityOnTag( refEntity_t *entity, const refEntity_t *parent, 
							qhandle_t parentModel, char *tagName ) {
	int				i;
	orientation_t	lerped;
	vec3_t			tempAxis[3];

//AxisClear( entity->axis );
	// lerp the tag
	trap_R_LerpTag( &lerped, parentModel, parent->oldframe, parent->frame,
		1.0 - parent->backlerp, tagName );

	// FIXME: allow origin offsets along tag?
	VectorCopy( parent->origin, entity->origin );
	for ( i = 0 ; i < 3 ; i++ ) {
		VectorMA( entity->origin, lerped.origin[i], parent->axis[i], entity->origin );
	}

	// had to cast away the const to avoid compiler problems...
	MatrixMultiply( entity->axis, lerped.axis, tempAxis );
	MatrixMultiply( tempAxis, ((refEntity_t *)parent)->axis, entity->axis );
}



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

FUNCTIONS CALLED EACH FRAME

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

/*
======================
CG_SetEntitySoundPosition

Also called by event processing code
======================
*/
void CG_SetEntitySoundPosition( centity_t *cent ) {
	if ( cent->currentState.solid == SOLID_BMODEL ) {
		vec3_t	origin;
		float	*v;

		v = cgs.inlineModelMidpoints[ cent->currentState.modelindex ];
		VectorAdd( cent->lerpOrigin, v, origin );
		trap_S_UpdateEntityPosition( cent->currentState.number, origin );
	} else {
		trap_S_UpdateEntityPosition( cent->currentState.number, cent->lerpOrigin );
	}
}

/*
==================
CG_EntityEffects

Add continuous entity effects, like local entity emission and lighting
==================
*/
static void CG_EntityEffects( centity_t *cent ) {

	// update sound origins
	CG_SetEntitySoundPosition( cent );

	// add loop sound
	if ( cent->currentState.loopSound ) {
		if (cent->currentState.eType != ET_SPEAKER) {
			trap_S_AddLoopingSound( cent->currentState.number, cent->lerpOrigin, vec3_origin, 
				cgs.gameSounds[ cent->currentState.loopSound ] );
		} else {
			trap_S_AddRealLoopingSound( cent->currentState.number, cent->lerpOrigin, vec3_origin, 
				cgs.gameSounds[ cent->currentState.loopSound ] );
		}
	}


	// constant light glow
	if ( cent->currentState.constantLight ) {
		int		cl;
		int		i, r, g, b;

		cl = cent->currentState.constantLight;
		r = cl & 255;
		g = ( cl >> 8 ) & 255;
		b = ( cl >> 16 ) & 255;
		i = ( ( cl >> 24 ) & 255 ) * 4;
		trap_R_AddLightToScene( cent->lerpOrigin, i, r, g, b );
	}

}


/*
==================
CG_General
==================
*/
static void CG_General( centity_t *cent ) {
	refEntity_t			ent;
	entityState_t		*s1;

	s1 = &cent->currentState;

	// if set to invisible, skip
	if (!s1->modelindex) {
		return;
	}

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

	// set frame

	ent.frame = s1->frame;
	ent.oldframe = ent.frame;
	ent.backlerp = 0;

	VectorCopy( cent->lerpOrigin, ent.origin);
	VectorCopy( cent->lerpOrigin, ent.oldorigin);

	ent.hModel = cgs.gameModels[s1->modelindex];

	// player model
	if (s1->number == cg.snap->ps.clientNum) {
		ent.renderfx |= RF_THIRD_PERSON;	// only draw from mirrors
	}

	// convert angles to axis
	AnglesToAxis( cent->lerpAngles, ent.axis );

	// add to refresh list
	trap_R_AddRefEntityToScene (&ent);
}

/*
==================
CG_Speaker

Speaker entities can automatically play sounds
==================
*/
static void CG_Speaker( centity_t *cent ) {
	if ( ! cent->currentState.clientNum ) {	// FIXME: use something other than clientNum...
		return;		// not auto triggering
	}

	if ( cg.time < cent->miscTime ) {
		return;
	}

	trap_S_StartSound (NULL, cent->currentState.number, CHAN_ITEM, cgs.gameSounds[cent->currentState.eventParm] );

	//	ent->s.frame = ent->wait * 10;
	//	ent->s.clientNum = ent->random * 10;
	cent->miscTime = cg.time + cent->currentState.frame * 100 + cent->currentState.clientNum * 100 * crandom();
}

/*
==================
CG_Item
==================
*/
static void CG_Item( centity_t *cent ) {
	refEntity_t		ent;
	entityState_t	*es;
	gitem_t			*item;
	int				msec;
	float			frac;
	float			scale;
	weaponInfo_t	*wi;

	es = &cent->currentState;
	if ( es->modelindex >= bg_numItems ) {
		CG_Error( "Bad item index %i on entity", es->modelindex );
	}

	// if set to invisible, skip
	if ( !es->modelindex || ( es->eFlags & EF_NODRAW ) ) {
		return;
	}

	item = &bg_itemlist[ es->modelindex ];
	if ( cg_simpleItems.integer && item->giType != IT_TEAM ) {
		memset( &ent, 0, sizeof( ent ) );
		ent.reType = RT_SPRITE;
		VectorCopy( cent->lerpOrigin, ent.origin );
		ent.radius = 14;
		ent.customShader = cg_items[es->modelindex].icon;
		ent.shaderRGBA[0] = 255;
		ent.shaderRGBA[1] = 255;
		ent.shaderRGBA[2] = 255;
		ent.shaderRGBA[3] = 255;
		trap_R_AddRefEntityToScene(&ent);
		return;
	}

	// items bob up and down continuously
	scale = 0.005 + cent->currentState.number * 0.00001;
	cent->lerpOrigin[2] += 4 + cos( ( cg.time + 1000 ) *  scale ) * 4;

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

	// autorotate at one of two speeds
	if ( item->giType == IT_HEALTH ) {
		VectorCopy( cg.autoAnglesFast, cent->lerpAngles );
		AxisCopy( cg.autoAxisFast, ent.axis );
	} else {
		VectorCopy( cg.autoAngles, cent->lerpAngles );
		AxisCopy( cg.autoAxis, ent.axis );
	}

	wi = NULL;
	// the weapons have their origin where they attatch to player
	// models, so we need to offset them or they will rotate
	// eccentricly
	if ( item->giType == IT_WEAPON ) {
		wi = &cg_weapons[item->giTag];
		cent->lerpOrigin[0] -= 
			wi->weaponMidpoint[0] * ent.axis[0][0] +
			wi->weaponMidpoint[1] * ent.axis[1][0] +
			wi->weaponMidpoint[2] * ent.axis[2][0];
		cent->lerpOrigin[1] -= 
			wi->weaponMidpoint[0] * ent.axis[0][1] +
			wi->weaponMidpoint[1] * ent.axis[1][1] +
			wi->weaponMidpoint[2] * ent.axis[2][1];
		cent->lerpOrigin[2] -= 
			wi->weaponMidpoint[0] * ent.axis[0][2] +
			wi->weaponMidpoint[1] * ent.axis[1][2] +
			wi->weaponMidpoint[2] * ent.axis[2][2];

		cent->lerpOrigin[2] += 8;	// an extra height boost
	}

	ent.hModel = cg_items[es->modelindex].models[0];

	VectorCopy( cent->lerpOrigin, ent.origin);
	VectorCopy( cent->lerpOrigin, ent.oldorigin);

	ent.nonNormalizedAxes = qfalse;

	// if just respawned, slowly scale up
	msec = cg.time - cent->miscTime;
	if ( msec >= 0 && msec < ITEM_SCALEUP_TIME ) {
		frac = (float)msec / ITEM_SCALEUP_TIME;
		VectorScale( ent.axis[0], frac, ent.axis[0] );
		VectorScale( ent.axis[1], frac, ent.axis[1] );
		VectorScale( ent.axis[2], frac, ent.axis[2] );
		ent.nonNormalizedAxes = qtrue;
	} else {
		frac = 1.0;
	}

	// items without glow textures need to keep a minimum light value
	// so they are always visible
	if ( ( item->giType == IT_WEAPON ) ||
		 ( item->giType == IT_ARMOR ) ) {
		ent.renderfx |= RF_MINLIGHT;
	}

	// increase the size of the weapons when they are presented as items
	if ( item->giType == IT_WEAPON ) {
		VectorScale( ent.axis[0], 1.5, ent.axis[0] );
		VectorScale( ent.axis[1], 1.5, ent.axis[1] );
		VectorScale( ent.axis[2], 1.5, ent.axis[2] );
		ent.nonNormalizedAxes = qtrue;
#ifdef MISSIONPACK
		trap_S_AddLoopingSound( cent->currentState.number, cent->lerpOrigin, vec3_origin, cgs.media.weaponHoverSound );
#endif
	}

#ifdef MISSIONPACK
	if ( item->giType == IT_HOLDABLE && item->giTag == HI_KAMIKAZE ) {
		VectorScale( ent.axis[0], 2, ent.axis[0] );
		VectorScale( ent.axis[1], 2, ent.axis[1] );
		VectorScale( ent.axis[2], 2, ent.axis[2] );
		ent.nonNormalizedAxes = qtrue;
	}
#endif

	// add to refresh list
	trap_R_AddRefEntityToScene(&ent);

#ifdef MISSIONPACK
	if ( item->giType == IT_WEAPON && wi->barrelModel ) {
		refEntity_t	barrel;

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

		barrel.hModel = wi->barrelModel;

		VectorCopy( ent.lightingOrigin, barrel.lightingOrigin );
		barrel.shadowPlane = ent.shadowPlane;
		barrel.renderfx = ent.renderfx;

		CG_PositionRotatedEntityOnTag( &barrel, &ent, wi->weaponModel, "tag_barrel" );

		AxisCopy( ent.axis, barrel.axis );
		barrel.nonNormalizedAxes = ent.nonNormalizedAxes;

		trap_R_AddRefEntityToScene( &barrel );
	}
#endif

	// accompanying rings / spheres for powerups
	if ( !cg_simpleItems.integer ) 
	{
		vec3_t spinAngles;

		VectorClear( spinAngles );

		if ( item->giType == IT_HEALTH || item->giType == IT_POWERUP )
		{
			if ( ( ent.hModel = cg_items[es->modelindex].models[1] ) != 0 )
			{
				if ( item->giType == IT_POWERUP )
				{
					ent.origin[2] += 12;
					spinAngles[1] = ( cg.time & 1023 ) * 360 / -1024.0f;
				}
				AnglesToAxis( spinAngles, ent.axis );
				
				// scale up if respawning
				if ( frac != 1.0 ) {
					VectorScale( ent.axis[0], frac, ent.axis[0] );
					VectorScale( ent.axis[1], frac, ent.axis[1] );
					VectorScale( ent.axis[2], frac, ent.axis[2] );
					ent.nonNormalizedAxes = qtrue;
				}
				trap_R_AddRefEntityToScene( &ent );
			}
		}
	}
}

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

/*
===============
CG_Missile
===============
*/
static void CG_Missile( centity_t *cent ) {
	refEntity_t			ent;
	entityState_t		*s1;
	const weaponInfo_t		*weapon;
//	int	col;

	s1 = &cent->currentState;
	if ( s1->weapon > WP_NUM_WEAPONS ) {
		s1->weapon = 0;
	}
	weapon = &cg_weapons[s1->weapon];

	// calculate the axis
	VectorCopy( s1->angles, cent->lerpAngles);

	// add trails
	if ( weapon->missileTrailFunc ) 
	{
		weapon->missileTrailFunc( cent, weapon );
	}
/*
	if ( cent->currentState.modelindex == TEAM_RED ) {
		col = 1;
	}
	else if ( cent->currentState.modelindex == TEAM_BLUE ) {
		col = 2;
	}
	else {
		col = 0;
	}

	// add dynamic light
	if ( weapon->missileDlight ) {
		trap_R_AddLightToScene(cent->lerpOrigin, weapon->missileDlight, 
			weapon->missileDlightColor[col][0], weapon->missileDlightColor[col][1], weapon->missileDlightColor[col][2] );
	}
*/
	// add dynamic light
	if ( weapon->missileDlight ) {
		trap_R_AddLightToScene(cent->lerpOrigin, weapon->missileDlight, 
			weapon->missileDlightColor[0], weapon->missileDlightColor[1], weapon->missileDlightColor[2] );
	}

	// add missile sound
	if ( weapon->missileSound ) {
		vec3_t	velocity;

		BG_EvaluateTrajectoryDelta( &cent->currentState.pos, cg.time, velocity );

		trap_S_AddLoopingSound( cent->currentState.number, cent->lerpOrigin, velocity, weapon->missileSound );
	}

	// create the render entity
	memset (&ent, 0, sizeof(ent));
	VectorCopy( cent->lerpOrigin, ent.origin);
	VectorCopy( cent->lerpOrigin, ent.oldorigin);

	if ( cent->currentState.weapon == WP_PLASMAGUN ) {
		ent.reType = RT_SPRITE;
		ent.radius = 16;
		ent.rotation = 0;
		ent.customShader = cgs.media.plasmaBallShader;
		trap_R_AddRefEntityToScene( &ent );
		return;
	}

	// flicker between two skins
	ent.skinNum = cg.clientFrame & 1;
	ent.hModel = weapon->missileModel;
	ent.renderfx = weapon->missileRenderfx | RF_NOSHADOW;

#ifdef MISSIONPACK
	if ( cent->currentState.weapon == WP_PROX_LAUNCHER ) {
		if (s1->generic1 == TEAM_BLUE) {
			ent.hModel = cgs.media.blueProxMine;
		}
	}
#endif

	// convert direction of travel into axis
	if ( VectorNormalize2( s1->pos.trDelta, ent.axis[0] ) == 0 ) {
		ent.axis[0][2] = 1;
	}

	// spin as it moves
	if ( s1->pos.trType != TR_STATIONARY ) {
		RotateAroundDirection( ent.axis, cg.time / 4 );
	} else {
#ifdef MISSIONPACK
		if ( s1->weapon == WP_PROX_LAUNCHER ) {
			AnglesToAxis( cent->lerpAngles, ent.axis );
		}
		else
#endif
		{
			RotateAroundDirection( ent.axis, s1->time );
		}
	}

	// add to refresh list, possibly with quad glow
	CG_AddRefEntityWithPowerups( &ent, s1, TEAM_FREE );
}

/*
===============
CG_Grapple

This is called when the grapple is sitting up against the wall
===============
*/
static void CG_Grapple( centity_t *cent ) {
	refEntity_t			ent;
	entityState_t		*s1;
	const weaponInfo_t		*weapon;