1 files changed, 1256 insertions, 0 deletions
diff --git a/src/cgame/cg_ents.c b/src/cgame/cg_ents.c
new file mode 100644
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--- /dev/null
+++ b/src/cgame/cg_ents.c
@@ -0,0 +1,1256 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+Copyright (C) 2000-2006 Tim Angus
+
+This file is part of Tremulous.
+
+Tremulous 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.
+
+Tremulous 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 Tremulous; 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_DrawBoxFace
+
+Draws a bounding box face
+======================
+*/
+static void CG_DrawBoxFace( vec3_t a, vec3_t b, vec3_t c, vec3_t d )
+{
+  polyVert_t  verts[ 4 ];
+  vec4_t      color = { 255.0f, 0.0f, 0.0f, 128.0f };
+
+  VectorCopy( d, verts[ 0 ].xyz );
+  verts[ 0 ].st[ 0 ] = 1;
+  verts[ 0 ].st[ 1 ] = 1;
+  Vector4Copy( color, verts[ 0 ].modulate );
+
+  VectorCopy( c, verts[ 1 ].xyz );
+  verts[ 1 ].st[ 0 ] = 1;
+  verts[ 1 ].st[ 1 ] = 0;
+  Vector4Copy( color, verts[ 1 ].modulate );
+
+  VectorCopy( b, verts[ 2 ].xyz );
+  verts[ 2 ].st[ 0 ] = 0;
+  verts[ 2 ].st[ 1 ] = 0;
+  Vector4Copy( color, verts[ 2 ].modulate );
+
+  VectorCopy( a, verts[ 3 ].xyz );
+  verts[ 3 ].st[ 0 ] = 0;
+  verts[ 3 ].st[ 1 ] = 1;
+  Vector4Copy( color, verts[ 3 ].modulate );
+
+  trap_R_AddPolyToScene( cgs.media.outlineShader, 4, verts );
+}
+
+/*
+======================
+CG_DrawBoundingBox
+
+Draws a bounding box
+======================
+*/
+void CG_DrawBoundingBox( vec3_t origin, vec3_t mins, vec3_t maxs )
+{
+  vec3_t  ppp, mpp, mmp, pmp;
+  vec3_t  mmm, pmm, ppm, mpm;
+
+  ppp[ 0 ] = origin[ 0 ] + maxs[ 0 ];
+  ppp[ 1 ] = origin[ 1 ] + maxs[ 1 ];
+  ppp[ 2 ] = origin[ 2 ] + maxs[ 2 ];
+
+  mpp[ 0 ] = origin[ 0 ] + mins[ 0 ];
+  mpp[ 1 ] = origin[ 1 ] + maxs[ 1 ];
+  mpp[ 2 ] = origin[ 2 ] + maxs[ 2 ];
+
+  mmp[ 0 ] = origin[ 0 ] + mins[ 0 ];
+  mmp[ 1 ] = origin[ 1 ] + mins[ 1 ];
+  mmp[ 2 ] = origin[ 2 ] + maxs[ 2 ];
+
+  pmp[ 0 ] = origin[ 0 ] + maxs[ 0 ];
+  pmp[ 1 ] = origin[ 1 ] + mins[ 1 ];
+  pmp[ 2 ] = origin[ 2 ] + maxs[ 2 ];
+
+  ppm[ 0 ] = origin[ 0 ] + maxs[ 0 ];
+  ppm[ 1 ] = origin[ 1 ] + maxs[ 1 ];
+  ppm[ 2 ] = origin[ 2 ] + mins[ 2 ];
+
+  mpm[ 0 ] = origin[ 0 ] + mins[ 0 ];
+  mpm[ 1 ] = origin[ 1 ] + maxs[ 1 ];
+  mpm[ 2 ] = origin[ 2 ] + mins[ 2 ];
+
+  mmm[ 0 ] = origin[ 0 ] + mins[ 0 ];
+  mmm[ 1 ] = origin[ 1 ] + mins[ 1 ];
+  mmm[ 2 ] = origin[ 2 ] + mins[ 2 ];
+
+  pmm[ 0 ] = origin[ 0 ] + maxs[ 0 ];
+  pmm[ 1 ] = origin[ 1 ] + mins[ 1 ];
+  pmm[ 2 ] = origin[ 2 ] + mins[ 2 ];
+
+  //phew!
+
+  CG_DrawBoxFace( ppp, mpp, mmp, pmp );
+  CG_DrawBoxFace( ppp, pmp, pmm, ppm );
+  CG_DrawBoxFace( mpp, ppp, ppm, mpm );
+  CG_DrawBoxFace( mmp, mpp, mpm, mmm );
+  CG_DrawBoxFace( pmp, mmp, mmm, pmm );
+  CG_DrawBoxFace( mmm, mpm, ppm, pmm );
+}
+
+
+/*
+======================
+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 );
+  }
+
+  if( CG_IsTrailSystemValid( &cent->muzzleTS ) )
+  {
+		//FIXME hack to prevent tesla trails reaching too far
+    if( cent->currentState.eType == ET_BUILDABLE )
+    {
+      vec3_t  front, back;
+
+      CG_AttachmentPoint( &cent->muzzleTS->frontAttachment, front );
+      CG_AttachmentPoint( &cent->muzzleTS->backAttachment, back );
+
+      if( Distance( front, back ) > ( TESLAGEN_RANGE * M_ROOT3 ) )
+        CG_DestroyTrailSystem( &cent->muzzleTS );
+    }
+
+    if( cg.time > cent->muzzleTSDeathTime && CG_IsTrailSystemValid( &cent->muzzleTS ) )
+      CG_DestroyTrailSystem( &cent->muzzleTS );
+  }
+}
+
+
+/*
+==================
+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_LaunchMissile
+===============
+*/
+static void CG_LaunchMissile( centity_t *cent )
+{
+  entityState_t       *es;
+  const weaponInfo_t  *wi;
+  particleSystem_t    *ps;
+  trailSystem_t       *ts;
+  weapon_t            weapon;
+  weaponMode_t        weaponMode;
+
+  es = &cent->currentState;
+
+  weapon = es->weapon;
+  if( weapon > WP_NUM_WEAPONS )
+    weapon = WP_NONE;
+
+  wi = &cg_weapons[ weapon ];
+  weaponMode = es->generic1;
+
+  if( wi->wim[ weaponMode ].missileParticleSystem )
+  {
+    ps = CG_SpawnNewParticleSystem( wi->wim[ weaponMode ].missileParticleSystem );
+
+    if( CG_IsParticleSystemValid( &ps ) )
+    {
+      CG_SetAttachmentCent( &ps->attachment, cent );
+      CG_AttachToCent( &ps->attachment );
+    }
+  }
+
+  if( wi->wim[ weaponMode ].missileTrailSystem )
+  {
+    ts = CG_SpawnNewTrailSystem( wi->wim[ weaponMode ].missileTrailSystem );
+
+    if( CG_IsTrailSystemValid( &ts ) )
+    {
+      CG_SetAttachmentCent( &ts->frontAttachment, cent );
+      CG_AttachToCent( &ts->frontAttachment );
+    }
+  }
+}
+
+/*
+===============
+CG_Missile
+===============
+*/
+static void CG_Missile( centity_t *cent )
+{
+  refEntity_t             ent;
+  entityState_t           *es;
+  const weaponInfo_t      *wi;
+  weapon_t                weapon;
+  weaponMode_t            weaponMode;
+  const weaponInfoMode_t  *wim;
+
+  es = &cent->currentState;
+
+  weapon = es->weapon;
+  if( weapon > WP_NUM_WEAPONS )
+    weapon = WP_NONE;
+
+  wi = &cg_weapons[ weapon ];
+  weaponMode = es->generic1;
+
+  wim = &wi->wim[ weaponMode ];
+
+  // calculate the axis
+  VectorCopy( es->angles, cent->lerpAngles );
+
+  // add dynamic light
+  if( wim->missileDlight )
+  {
+    trap_R_AddLightToScene( cent->lerpOrigin, wim->missileDlight,
+      wim->missileDlightColor[ 0 ],
+      wim->missileDlightColor[ 1 ],
+      wim->missileDlightColor[ 2 ] );
+  }
+
+  // add missile sound
+  if( wim->missileSound )
+  {
+    vec3_t  velocity;
+
+    BG_EvaluateTrajectoryDelta( &cent->currentState.pos, cg.time, velocity );
+
+    trap_S_AddLoopingSound( cent->currentState.number, cent->lerpOrigin, velocity, wim->missileSound );
+  }
+
+  // create the render entity
+  memset( &ent, 0, sizeof( ent ) );
+  VectorCopy( cent->lerpOrigin, ent.origin );
+  VectorCopy( cent->lerpOrigin, ent.oldorigin );
+
+  if( wim->usesSpriteMissle )
+  {
+    ent.reType = RT_SPRITE;
+    ent.radius = wim->missileSpriteSize;
+    ent.rotation = 0;
+    ent.customShader = wim->missileSprite;
+    ent.shaderRGBA[ 0 ] = 0xFF;
+    ent.shaderRGBA[ 1 ] = 0xFF;
+    ent.shaderRGBA[ 2 ] = 0xFF;
+    ent.shaderRGBA[ 3 ] = 0xFF;
+  }
+  else
+  {
+    ent.hModel = wim->missileModel;
+    ent.renderfx = wim->missileRenderfx | RF_NOSHADOW;
+
+    // convert direction of travel into axis
+    if( VectorNormalize2( es->pos.trDelta, ent.axis[ 0 ] ) == 0 )
+      ent.axis[ 0 ][ 2 ] = 1;
+
+    // spin as it moves
+    if( es->pos.trType != TR_STATIONARY && wim->missileRotates )
+      RotateAroundDirection( ent.axis, cg.time / 4 );
+    else
+      RotateAroundDirection( ent.axis, es->time );
+
+    if( wim->missileAnimates )
+    {
+      int timeSinceStart = cg.time - es->time;
+
+      if( wim->missileAnimLooping )
+      {
+        ent.frame = wim->missileAnimStartFrame +
+          (int)( ( timeSinceStart / 1000.0f ) * wim->missileAnimFrameRate ) %
+          wim->missileAnimNumFrames;
+      }
+      else
+      {
+        ent.frame = wim->missileAnimStartFrame +
+          (int)( ( timeSinceStart / 1000.0f ) * wim->missileAnimFrameRate );
+
+        if( ent.frame > ( wim->missileAnimStartFrame + wim->missileAnimNumFrames ) )
+          ent.frame = wim->missileAnimStartFrame + wim->missileAnimNumFrames;
+      }
+    }
+  }
+
+  //only refresh if there is something to display
+  if( wim->missileSprite || wim->missileModel )
+    trap_R_AddRefEntityToScene( &ent );
+}
+
+/*
+===============
+CG_Mover
+===============
+*/
+static void CG_Mover( centity_t *cent )
+{
+  refEntity_t     ent;
+  entityState_t   *s1;
+
+  s1 = &cent->currentState;
+
+  // create the render entity
+  memset( &ent, 0, sizeof( ent ) );
+  VectorCopy( cent->lerpOrigin, ent.origin );
+  VectorCopy( cent->lerpOrigin, ent.oldorigin );
+  AnglesToAxis( cent->lerpAngles, ent.axis );
+
+  ent.renderfx = RF_NOSHADOW;
+
+  // flicker between two skins (FIXME?)
+  ent.skinNum = ( cg.time >> 6 ) & 1;
+
+  // get the model, either as a bmodel or a modelindex
+  if( s1->solid == SOLID_BMODEL )
+    ent.hModel = cgs.inlineDrawModel[ s1->modelindex ];
+  else
+    ent.hModel = cgs.gameModels[ s1->modelindex ];
+
+  // add to refresh list
+  trap_R_AddRefEntityToScene( &ent );
+
+  // add the secondary model
+  if( s1->modelindex2 )
+  {
+    ent.skinNum = 0;
+    ent.hModel = cgs.gameModels[ s1->modelindex2 ];
+    trap_R_AddRefEntityToScene( &ent );
+  }
+
+}
+
+/*
+===============
+CG_Beam
+
+Also called as an event
+===============
+*/
+void CG_Beam( centity_t *cent )
+{
+  refEntity_t     ent;
+  entityState_t   *s1;
+
+  s1 = &cent->currentState;
+
+  // create the render entity
+  memset( &ent, 0, sizeof( ent ) );
+  VectorCopy( s1->pos.trBase, ent.origin );
+  VectorCopy( s1->origin2, ent.oldorigin );
+  AxisClear( ent.axis );
+  ent.reType = RT_BEAM;
+
+  ent.renderfx = RF_NOSHADOW;
+
+  // add to refresh list
+  trap_R_AddRefEntityToScene( &ent );
+}
+
+
+/*
+===============
+CG_Portal
+===============
+*/
+static void CG_Portal( centity_t *cent )
+{
+  refEntity_t     ent;
+  entityState_t   *s1;
+
+  s1 = &cent->currentState;
+
+  // create the render entity
+  memset( &ent, 0, sizeof( ent ) );
+  VectorCopy( cent->lerpOrigin, ent.origin );
+  VectorCopy( s1->origin2, ent.oldorigin );
+  ByteToDir( s1->eventParm, ent.axis[ 0 ] );
+  PerpendicularVector( ent.axis[ 1 ], ent.axis[ 0 ] );
+
+  // negating this tends to get the directions like they want
+  // we really should have a camera roll value
+  VectorSubtract( vec3_origin, ent.axis[ 1 ], ent.axis[ 1 ] );
+
+  CrossProduct( ent.axis[ 0 ], ent.axis[ 1 ], ent.axis[ 2 ] );
+  ent.reType = RT_PORTALSURFACE;
+  ent.oldframe = s1->powerups;
+  ent.frame = s1->frame;    // rotation speed
+  ent.skinNum = s1->clientNum / 256.0 * 360;  // roll offset
+
+  // add to refresh list
+  trap_R_AddRefEntityToScene( &ent );
+}
+
+//============================================================================
+
+#define SETBOUNDS(v1,v2,r)  ((v1)[0]=(-r/2),(v1)[1]=(-r/2),(v1)[2]=(-r/2),\
+                             (v2)[0]=(r/2),(v2)[1]=(r/2),(v2)[2]=(r/2))
+#define RADIUSSTEP          0.5f
+
+#define FLARE_OFF       0
+#define FLARE_NOFADE    1
+#define FLARE_TIMEFADE  2
+#define FLARE_REALFADE  3
+
+/*
+=========================
+CG_LightFlare
+=========================
+*/
+static void CG_LightFlare( centity_t *cent )
+{
+  refEntity_t   flare;
+  entityState_t *es;
+  vec3_t        forward, delta;
+  float         len;
+  trace_t       tr;
+  float         maxAngle;
+  vec3_t        mins, maxs, start, end;
+  float         srcRadius, srLocal, ratio = 1.0f;
+  int           entityNum;
+
+  es = &cent->currentState;
+
+  if( cg.renderingThirdPerson )
+    entityNum = MAGIC_TRACE_HACK;
+  else
+    entityNum = cg.predictedPlayerState.clientNum;
+
+  //don't draw light flares
+  if( cg_lightFlare.integer == FLARE_OFF )
+    return;
+
+  //flare is "off"
+  if( es->eFlags & EF_NODRAW )
+    return;
+
+  CG_Trace( &tr, cg.refdef.vieworg, NULL, NULL, es->angles2,
+            entityNum, MASK_SHOT );
+
+  //if there is no los between the view and the flare source
+  //it definately cannot be seen
+  if( tr.fraction < 1.0f || tr.allsolid )
+    return;
+
+  memset( &flare, 0, sizeof( flare ) );
+
+  flare.reType = RT_SPRITE;
+  flare.customShader = cgs.gameShaders[ es->modelindex ];
+  flare.shaderRGBA[ 0 ] = 0xFF;
+  flare.shaderRGBA[ 1 ] = 0xFF;
+  flare.shaderRGBA[ 2 ] = 0xFF;
+  flare.shaderRGBA[ 3 ] = 0xFF;
+
+  //flares always drawn before the rest of the scene
+  flare.renderfx |= RF_DEPTHHACK;
+
+  //bunch of geometry
+  AngleVectors( es->angles, forward, NULL, NULL );
+  VectorCopy( cent->lerpOrigin, flare.origin );
+  VectorSubtract( flare.origin, cg.refdef.vieworg, delta );
+  len = VectorLength( delta );
+  VectorNormalize( delta );
+
+  //flare is too close to camera to be drawn
+  if( len < es->generic1 )
+    return;
+
+  //don't bother for flares behind the view plane
+  if( DotProduct( delta, cg.refdef.viewaxis[ 0 ] ) < 0.0 )
+    return;
+
+  //only recalculate radius and ratio every three frames
+  if( !( cg.clientFrame % 2 ) )
+  {
+    //can only see the flare when in front of it
+    flare.radius = len / es->origin2[ 0 ];
+
+    if( es->origin2[ 2 ] == 0 )
+      srcRadius = srLocal = flare.radius / 2.0f;
+    else
+      srcRadius = srLocal = len / es->origin2[ 2 ];
+
+    maxAngle = es->origin2[ 1 ];
+
+    if( maxAngle > 0.0f )
+    {
+      float radiusMod = 1.0f - ( 180.0f - RAD2DEG(
+            acos( DotProduct( delta, forward ) ) ) ) / maxAngle;
+
+      if( radiusMod < 0.0f )
+        radiusMod = 0.0f;
+
+      flare.radius *= radiusMod;
+    }
+
+    if( flare.radius < 0.0f )
+      flare.radius = 0.0f;
+
+    VectorMA( flare.origin, -flare.radius, delta, end );
+    VectorMA( cg.refdef.vieworg, flare.radius, delta, start );
+
+    if( cg_lightFlare.integer == FLARE_REALFADE )
+    {
+      //"correct" flares
+      CG_BiSphereTrace( &tr, cg.refdef.vieworg, end,
+          1.0f, srcRadius, entityNum, MASK_SHOT );
+
+      if( tr.fraction < 1.0f )
+        ratio = tr.lateralFraction;
+      else
+        ratio = 1.0f;
+    }
+    else if( cg_lightFlare.integer == FLARE_TIMEFADE )
+    {
+      //draw timed flares
+      SETBOUNDS( mins, maxs, srcRadius );
+      CG_Trace( &tr, start, mins, maxs, end,
+                entityNum, MASK_SHOT );
+
+      if( ( tr.fraction < 1.0f || tr.startsolid ) && cent->lfs.status )
+      {
+        cent->lfs.status = qfalse;
+        cent->lfs.lastTime = cg.time;
+      }
+      else if( ( tr.fraction == 1.0f && !tr.startsolid ) && !cent->lfs.status )
+      {
+        cent->lfs.status = qtrue;
+        cent->lfs.lastTime = cg.time;
+      }
+
+      //fade flare up
+      if( cent->lfs.status )
+      {
+        if( cent->lfs.lastTime + es->time > cg.time )
+          ratio = (float)( cg.time - cent->lfs.lastTime ) / es->time;
+      }
+
+      //fade flare down
+      if( !cent->lfs.status )
+      {
+        if( cent->lfs.lastTime + es->time > cg.time )
+        {
+          ratio = (float)( cg.time - cent->lfs.lastTime ) / es->time;
+          ratio = 1.0f - ratio;
+        }
+        else
+          ratio = 0.0f;
+      }
+    }
+    else if( cg_lightFlare.integer == FLARE_NOFADE )
+    {
+      //draw nofade flares
+      SETBOUNDS( mins, maxs, srcRadius );
+      CG_Trace( &tr, start, mins, maxs, end,
+                entityNum, MASK_SHOT );
+
+      //flare source occluded
+      if( ( tr.fraction < 1.0f || tr.startsolid ) )
+        ratio = 0.0f;
+    }
+  }
+  else
+  {
+    ratio        = cent->lfs.lastRatio;
+    flare.radius = cent->lfs.lastRadius;
+  }
+
+  cent->lfs.lastRatio  = ratio;
+  cent->lfs.lastRadius = flare.radius;
+
+  if( ratio < 1.0f )
+  {
+    flare.radius *= ratio;
+    flare.shaderRGBA[ 3 ] = (byte)( (float)flare.shaderRGBA[ 3 ] * ratio );
+  }
+
+  if( flare.radius <= 0.0f )
+    return;
+
+  trap_R_AddRefEntityToScene( &flare );
+}
+
+/*
+=========================
+CG_Lev2ZapChain
+=========================
+*/
+static void CG_Lev2ZapChain( centity_t *cent )
+{
+  int           i;
+  entityState_t *es;
+  centity_t     *source = NULL, *target = NULL;
+
+  es = &cent->currentState;
+
+  for( i = 0; i <= 2; i++ )
+  {
+    switch( i )
+    {
+      case 0:
+        if( es->time <= 0 )
+          continue;
+
+        source = &cg_entities[ es->powerups ];
+        target = &cg_entities[ es->time ];
+        break;
+
+      case 1:
+        if( es->time2 <= 0 )
+          continue;
+
+        source = &cg_entities[ es->time ];
+        target = &cg_entities[ es->time2 ];
+        break;
+
+      case 2:
+        if( es->constantLight <= 0 )
+          continue;
+
+        source = &cg_entities[ es->time2 ];
+        target = &cg_entities[ es->constantLight ];
+        break;
+    }
+
+    if( !CG_IsTrailSystemValid( &cent->level2ZapTS[ i ] ) )
+      cent->level2ZapTS[ i ] = CG_SpawnNewTrailSystem( cgs.media.level2ZapTS );
+
+    if( CG_IsTrailSystemValid( &cent->level2ZapTS[ i ] ) )
+    {
+      CG_SetAttachmentCent( &cent->level2ZapTS[ i ]->frontAttachment, source );
+      CG_SetAttachmentCent( &cent->level2ZapTS[ i ]->backAttachment, target );
+      CG_AttachToCent( &cent->level2ZapTS[ i ]->frontAttachment );
+      CG_AttachToCent( &cent->level2ZapTS[ i ]->backAttachment );
+    }
+  }
+}
+
+/*
+=========================
+CG_AdjustPositionForMover
+
+Also called by client movement prediction code
+=========================
+*/
+void CG_AdjustPositionForMover( const vec3_t in, int moverNum, int fromTime, int toTime, vec3_t out )
+{
+  centity_t *cent;
+  vec3_t    oldOrigin, origin, deltaOrigin;
+  vec3_t    oldAngles, angles, deltaAngles;
+
+  if( moverNum <= 0 || moverNum >= ENTITYNUM_MAX_NORMAL )
+  {
+    VectorCopy( in, out );
+    return;
+  }
+
+  cent = &cg_entities[ moverNum ];
+
+  if( cent->currentState.eType != ET_MOVER )
+  {
+    VectorCopy( in, out );
+    return;
+  }
+
+  BG_EvaluateTrajectory( &cent->currentState.pos, fromTime, oldOrigin );
+  BG_EvaluateTrajectory( &cent->currentState.apos, fromTime, oldAngles );
+
+  BG_EvaluateTrajectory( &cent->currentState.pos, toTime, origin );
+  BG_EvaluateTrajectory( &cent->currentState.apos, toTime, angles );
+
+  VectorSubtract( origin, oldOrigin, deltaOrigin );
+  VectorSubtract( angles, oldAngles, deltaAngles );
+
+  VectorAdd( in, deltaOrigin, out );
+
+  // FIXME: origin change when on a rotating object
+}
+
+
+/*
+=============================
+CG_InterpolateEntityPosition
+=============================
+*/
+static void CG_InterpolateEntityPosition( centity_t *cent )
+{
+  vec3_t    current, next;
+  float     f;
+
+  // it would be an internal error to find an entity that interpolates without
+  // a snapshot ahead of the current one
+  if( cg.nextSnap == NULL )
+    CG_Error( "CG_InterpoateEntityPosition: cg.nextSnap == NULL" );
+
+  f = cg.frameInterpolation;
+
+  // this will linearize a sine or parabolic curve, but it is important
+  // to not extrapolate player positions if more recent data is available
+  BG_EvaluateTrajectory( &cent->currentState.pos, cg.snap->serverTime, current );
+  BG_EvaluateTrajectory( &cent->nextState.pos, cg.nextSnap->serverTime, next );
+
+  cent->lerpOrigin[ 0 ] = current[ 0 ] + f * ( next[ 0 ] - current[ 0 ] );
+  cent->lerpOrigin[ 1 ] = current[ 1 ] + f * ( next[ 1 ] - current[ 1 ] );
+  cent->lerpOrigin[ 2 ] = current[ 2 ] + f * ( next[ 2 ] - current[ 2 ] );
+
+  BG_EvaluateTrajectory( &cent->currentState.apos, cg.snap->serverTime, current );
+  BG_EvaluateTrajectory( &cent->nextState.apos, cg.nextSnap->serverTime, next );
+
+  cent->lerpAngles[ 0 ] = LerpAngle( current[ 0 ], next[ 0 ], f );
+  cent->lerpAngles[ 1 ] = LerpAngle( current[ 1 ], next[ 1 ], f );
+  cent->lerpAngles[ 2 ] = LerpAngle( current[ 2 ], next[ 2 ], f );
+
+}
+
+/*
+===============
+CG_CalcEntityLerpPositions
+
+===============
+*/
+static void CG_CalcEntityLerpPositions( centity_t *cent )
+{
+  // this will be set to how far forward projectiles will be extrapolated
+  int timeshift = 0;
+
+  // if this player does not want to see extrapolated players
+  if( !cg_smoothClients.integer )
+  {
+    // make sure the clients use TR_INTERPOLATE
+    if( cent->currentState.number < MAX_CLIENTS )
+    {
+      cent->currentState.pos.trType = TR_INTERPOLATE;
+      cent->nextState.pos.trType = TR_INTERPOLATE;
+    }
+  }
+
+  if( cent->interpolate && cent->currentState.pos.trType == TR_INTERPOLATE )
+  {
+    CG_InterpolateEntityPosition( cent );
+    return;
+  }
+
+  // first see if we can interpolate between two snaps for
+  // linear extrapolated clients
+  if( cent->interpolate && cent->currentState.pos.trType == TR_LINEAR_STOP &&
+      cent->currentState.number < MAX_CLIENTS )
+  {
+    CG_InterpolateEntityPosition( cent );
+    return;
+  }
+
+  if( cg_projectileNudge.integer > 0 &&
+    cent->currentState.eType == ET_MISSILE &&
+    !( cg.snap->ps.pm_flags & PMF_FOLLOW ) )
+  {
+    timeshift = cg.ping;
+  }
+
+  // just use the current frame and evaluate as best we can
+  BG_EvaluateTrajectory( &cent->currentState.pos,
+    ( cg.time + timeshift ), cent->lerpOrigin );
+  BG_EvaluateTrajectory( &cent->currentState.apos,
+    ( cg.time + timeshift ), cent->lerpAngles );
+
+  if( timeshift )
+  {
+    trace_t tr;
+    vec3_t lastOrigin;
+	
+    BG_EvaluateTrajectory( &cent->currentState.pos, cg.time, lastOrigin );
+	
+    CG_Trace( &tr, lastOrigin, vec3_origin, vec3_origin, cent->lerpOrigin,
+      cent->currentState.number, MASK_SHOT );
+	
+    // don't let the projectile go through the floor
+    if( tr.fraction < 1.0f )
+      VectorLerp( tr.fraction, lastOrigin, cent->lerpOrigin, cent->lerpOrigin );
+  }
+
+  // adjust for riding a mover if it wasn't rolled into the predicted
+  // player state
+  if( cent != &cg.predictedPlayerEntity )
+  {
+    CG_AdjustPositionForMover( cent->lerpOrigin, cent->currentState.groundEntityNum,
+                               cg.snap->serverTime, cg.time, cent->lerpOrigin );
+  }
+}
+
+
+/*
+===============
+CG_CEntityPVSEnter
+
+===============
+*/
+static void CG_CEntityPVSEnter( centity_t *cent )
+{
+  entityState_t *es = &cent->currentState;
+
+  if( cg_debugPVS.integer )
+    CG_Printf( "Entity %d entered PVS\n", cent->currentState.number );
+
+  switch( es->eType )
+  {
+    case ET_MISSILE:
+      CG_LaunchMissile( cent );
+      break;
+  }
+
+  //clear any particle systems from previous uses of this centity_t
+  cent->muzzlePS = NULL;
+  cent->muzzlePsTrigger = qfalse;
+  cent->jetPackPS = NULL;
+  cent->jetPackState = JPS_OFF;
+  cent->buildablePS = NULL;
+  cent->entityPS = NULL;
+  cent->entityPSMissing = qfalse;
+
+  //make sure that the buildable animations are in a consistent state
+  //when a buildable enters the PVS
+  cent->buildableAnim = cent->lerpFrame.animationNumber = BANIM_NONE;
+  cent->oldBuildableAnim = es->legsAnim;
+}
+
+
+/*
+===============
+CG_CEntityPVSLeave
+
+===============
+*/
+static void CG_CEntityPVSLeave( centity_t *cent )
+{
+  int           i;
+  entityState_t *es = &cent->currentState;
+
+  if( cg_debugPVS.integer )
+    CG_Printf( "Entity %d left PVS\n", cent->currentState.number );
+
+  switch( es->eType )
+  {
+    case ET_LEV2_ZAP_CHAIN:
+      for( i = 0; i <= 2; i++ )
+      {
+        if( CG_IsTrailSystemValid( &cent->level2ZapTS[ i ] ) )
+          CG_DestroyTrailSystem( &cent->level2ZapTS[ i ] );
+      }
+      break;
+  }
+}
+
+
+/*
+===============
+CG_AddCEntity
+
+===============
+*/
+static void CG_AddCEntity( centity_t *cent )
+{
+  // event-only entities will have been dealt with already
+  if( cent->currentState.eType >= ET_EVENTS )
+    return;
+
+  // calculate the current origin
+  CG_CalcEntityLerpPositions( cent );
+
+  // add automatic effects
+  CG_EntityEffects( cent );
+
+  switch( cent->currentState.eType )
+  {
+    default:
+      CG_Error( "Bad entity type: %i\n", cent->currentState.eType );
+      break;
+
+    case ET_INVISIBLE:
+    case ET_PUSH_TRIGGER:
+    case ET_TELEPORT_TRIGGER:
+      break;
+
+    case ET_GENERAL:
+      CG_General( cent );
+      break;
+
+    case ET_CORPSE:
+      CG_Corpse( cent );
+      break;
+
+    case ET_PLAYER:
+      CG_Player( cent );
+      break;
+
+    case ET_BUILDABLE:
+      CG_Buildable( cent );
+      break;
+
+    case ET_MISSILE:
+      CG_Missile( cent );
+      break;
+
+    case ET_MOVER:
+      CG_Mover( cent );
+      break;
+
+    case ET_BEAM:
+      CG_Beam( cent );
+      break;
+
+    case ET_PORTAL:
+      CG_Portal( cent );
+      break;
+
+    case ET_SPEAKER:
+      CG_Speaker( cent );
+      break;
+
+    case ET_PARTICLE_SYSTEM:
+      CG_ParticleSystemEntity( cent );
+      break;
+
+    case ET_ANIMMAPOBJ:
+      CG_AnimMapObj( cent );
+      break;
+
+    case ET_MODELDOOR:
+      CG_ModelDoor( cent );
+      break;
+
+    case ET_LIGHTFLARE:
+      CG_LightFlare( cent );
+      break;
+
+    case ET_LEV2_ZAP_CHAIN:
+      CG_Lev2ZapChain( cent );
+      break;
+  }
+}
+
+/*
+===============
+CG_AddPacketEntities
+
+===============
+*/
+void CG_AddPacketEntities( void )
+{
+  int             num;
+  centity_t       *cent;
+  playerState_t   *ps;
+
+  // set cg.frameInterpolation
+  if( cg.nextSnap )
+  {
+    int   delta;
+
+    delta = ( cg.nextSnap->serverTime - cg.snap->serverTime );
+
+    if( delta == 0 )
+      cg.frameInterpolation = 0;
+    else
+      cg.frameInterpolation = (float)( cg.time - cg.snap->serverTime ) / delta;
+  }
+  else
+  {
+    cg.frameInterpolation = 0;  // actually, it should never be used, because
+                  // no entities should be marked as interpolating
+  }
+
+  // the auto-rotating items will all have the same axis
+  cg.autoAngles[ 0 ] = 0;
+  cg.autoAngles[ 1 ] = ( cg.time & 2047 ) * 360 / 2048.0;
+  cg.autoAngles[ 2 ] = 0;
+
+  cg.autoAnglesFast[ 0 ] = 0;
+  cg.autoAnglesFast[ 1 ] = ( cg.time & 1023 ) * 360 / 1024.0f;
+  cg.autoAnglesFast[ 2 ] = 0;
+
+  AnglesToAxis( cg.autoAngles, cg.autoAxis );
+  AnglesToAxis( cg.autoAnglesFast, cg.autoAxisFast );
+
+  // generate and add the entity from the playerstate
+  ps = &cg.predictedPlayerState;
+  BG_PlayerStateToEntityState( ps, &cg.predictedPlayerEntity.currentState, qfalse );
+  cg.predictedPlayerEntity.valid = qtrue;
+  CG_AddCEntity( &cg.predictedPlayerEntity );
+
+  // lerp the non-predicted value for lightning gun origins
+  CG_CalcEntityLerpPositions( &cg_entities[ cg.snap->ps.clientNum ] );
+
+  // scanner
+  CG_UpdateEntityPositions( );
+
+  for( num = 0; num < MAX_GENTITIES; num++ )
+    cg_entities[ num ].valid = qfalse;
+
+  // add each entity sent over by the server
+  for( num = 0; num < cg.snap->numEntities; num++ )
+  {
+    cent = &cg_entities[ cg.snap->entities[ num ].number ];
+    cent->valid = qtrue;
+  }
+
+  for( num = 0; num < MAX_GENTITIES; num++ )
+  {
+    cent = &cg_entities[ num ];
+
+    if( cent->valid && !cent->oldValid )
+      CG_CEntityPVSEnter( cent );
+    else if( !cent->valid && cent->oldValid )
+      CG_CEntityPVSLeave( cent );
+
+    cent->oldValid = cent->valid;
+  }
+
+  // add each entity sent over by the server
+  for( num = 0; num < cg.snap->numEntities; num++ )
+  {
+    cent = &cg_entities[ cg.snap->entities[ num ].number ];
+    CG_AddCEntity( cent );
+  }
+
+  //make an attempt at drawing bounding boxes of selected entity types
+  if( cg_drawBBOX.integer )
+  {
+    for( num = 0; num < cg.snap->numEntities; num++ )
+    {
+      float         x, zd, zu;
+      vec3_t        mins, maxs;
+      entityState_t *es;
+
+      cent = &cg_entities[ cg.snap->entities[ num ].number ];
+      es = &cent->currentState;
+
+      switch( es->eType )
+      {
+        case ET_BUILDABLE:
+        case ET_MISSILE:
+        case ET_CORPSE:
+          x = ( es->solid & 255 );
+          zd = ( ( es->solid >> 8 ) & 255 );
+          zu = ( ( es->solid >> 16 ) & 255 ) - 32;
+
+          mins[ 0 ] = mins[ 1 ] = -x;
+          maxs[ 0 ] = maxs[ 1 ] = x;
+          mins[ 2 ] = -zd;
+          maxs[ 2 ] = zu;
+
+          CG_DrawBoundingBox( cent->lerpOrigin, mins, maxs );
+          break;
+
+        default:
+          break;
+      }
+    }
+  }
+}
+