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- /*
- Copyright (C) 1997-2001 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 the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
- // world.c -- world query functions
-
- #include "server.h"
-
- /*
- ===============================================================================
-
- ENTITY AREA CHECKING
-
- FIXME: this use of "area" is different from the bsp file use
- ===============================================================================
- */
-
- // (type *)STRUCT_FROM_LINK(link_t *link, type, member)
- // ent = STRUCT_FROM_LINK(link,entity_t,order)
- // FIXME: remove this mess!
- #define STRUCT_FROM_LINK(l,t,m) ((t *)((byte *)l - (int)&(((t *)0)->m)))
-
- #define EDICT_FROM_AREA(l) STRUCT_FROM_LINK(l,edict_t,area)
-
- typedef struct areanode_s
- {
- int axis; // -1 = leaf node
- float dist;
- struct areanode_s *children[2];
- link_t trigger_edicts;
- link_t solid_edicts;
- } areanode_t;
-
- #define AREA_DEPTH 4
- #define AREA_NODES 32
-
- areanode_t sv_areanodes[AREA_NODES];
- int sv_numareanodes;
-
- float *area_mins, *area_maxs;
- edict_t **area_list;
- int area_count, area_maxcount;
- int area_type;
-
- int SV_HullForEntity (edict_t *ent);
-
-
- // ClearLink is used for new headnodes
- void ClearLink (link_t *l)
- {
- l->prev = l->next = l;
- }
-
- void RemoveLink (link_t *l)
- {
- l->next->prev = l->prev;
- l->prev->next = l->next;
- }
-
- void InsertLinkBefore (link_t *l, link_t *before)
- {
- l->next = before;
- l->prev = before->prev;
- l->prev->next = l;
- l->next->prev = l;
- }
-
- /*
- ===============
- SV_CreateAreaNode
-
- Builds a uniformly subdivided tree for the given world size
- ===============
- */
- areanode_t *SV_CreateAreaNode (int depth, vec3_t mins, vec3_t maxs)
- {
- areanode_t *anode;
- vec3_t size;
- vec3_t mins1, maxs1, mins2, maxs2;
-
- anode = &sv_areanodes[sv_numareanodes];
- sv_numareanodes++;
-
- ClearLink (&anode->trigger_edicts);
- ClearLink (&anode->solid_edicts);
-
- if (depth == AREA_DEPTH)
- {
- anode->axis = -1;
- anode->children[0] = anode->children[1] = NULL;
- return anode;
- }
-
- VectorSubtract (maxs, mins, size);
- if (size[0] > size[1])
- anode->axis = 0;
- else
- anode->axis = 1;
-
- anode->dist = 0.5 * (maxs[anode->axis] + mins[anode->axis]);
- VectorCopy (mins, mins1);
- VectorCopy (mins, mins2);
- VectorCopy (maxs, maxs1);
- VectorCopy (maxs, maxs2);
-
- maxs1[anode->axis] = mins2[anode->axis] = anode->dist;
-
- anode->children[0] = SV_CreateAreaNode (depth+1, mins2, maxs2);
- anode->children[1] = SV_CreateAreaNode (depth+1, mins1, maxs1);
-
- return anode;
- }
-
- /*
- ===============
- SV_ClearWorld
-
- ===============
- */
- void SV_ClearWorld (void)
- {
- memset (sv_areanodes, 0, sizeof(sv_areanodes));
- sv_numareanodes = 0;
- SV_CreateAreaNode (0, sv.models[1]->mins, sv.models[1]->maxs);
- }
-
-
- /*
- ===============
- SV_UnlinkEdict
-
- ===============
- */
- void SV_UnlinkEdict (edict_t *ent)
- {
- if (!ent->area.prev)
- return; // not linked in anywhere
- RemoveLink (&ent->area);
- ent->area.prev = ent->area.next = NULL;
- }
-
-
- /*
- ===============
- SV_LinkEdict
-
- ===============
- */
- #define MAX_TOTAL_ENT_LEAFS 128
- void SV_LinkEdict (edict_t *ent)
- {
- areanode_t *node;
- int leafs[MAX_TOTAL_ENT_LEAFS];
- int clusters[MAX_TOTAL_ENT_LEAFS];
- int num_leafs;
- int i, j, k;
- int area;
- int topnode;
-
- if (ent->area.prev)
- SV_UnlinkEdict (ent); // unlink from old position
-
- if (ent == ge->edicts)
- return; // don't add the world
-
- if (!ent->inuse)
- return;
-
- // set the size
- VectorSubtract (ent->maxs, ent->mins, ent->size);
-
- // encode the size into the entity_state for client prediction
- if (ent->solid == SOLID_BBOX && !(ent->svflags & SVF_DEADMONSTER))
- { // assume that x/y are equal and symetric
- i = ent->maxs[0]/8;
- if (i<1)
- i = 1;
- if (i>31)
- i = 31;
-
- // z is not symetric
- j = (-ent->mins[2])/8;
- if (j<1)
- j = 1;
- if (j>31)
- j = 31;
-
- // and z maxs can be negative...
- k = (ent->maxs[2]+32)/8;
- if (k<1)
- k = 1;
- if (k>63)
- k = 63;
-
- ent->s.solid = (k<<10) | (j<<5) | i;
- }
- else if (ent->solid == SOLID_BSP)
- {
- ent->s.solid = 31; // a solid_bbox will never create this value
- }
- else
- ent->s.solid = 0;
-
- // set the abs box
- if (ent->solid == SOLID_BSP &&
- (ent->s.angles[0] || ent->s.angles[1] || ent->s.angles[2]) )
- { // expand for rotation
- float max, v;
- int i;
-
- max = 0;
- for (i=0 ; i<3 ; i++)
- {
- v =fabs( ent->mins[i]);
- if (v > max)
- max = v;
- v =fabs( ent->maxs[i]);
- if (v > max)
- max = v;
- }
- for (i=0 ; i<3 ; i++)
- {
- ent->absmin[i] = ent->s.origin[i] - max;
- ent->absmax[i] = ent->s.origin[i] + max;
- }
- }
- else
- { // normal
- VectorAdd (ent->s.origin, ent->mins, ent->absmin);
- VectorAdd (ent->s.origin, ent->maxs, ent->absmax);
- }
-
- // because movement is clipped an epsilon away from an actual edge,
- // we must fully check even when bounding boxes don't quite touch
- ent->absmin[0] -= 1;
- ent->absmin[1] -= 1;
- ent->absmin[2] -= 1;
- ent->absmax[0] += 1;
- ent->absmax[1] += 1;
- ent->absmax[2] += 1;
-
- // link to PVS leafs
- ent->num_clusters = 0;
- ent->areanum = 0;
- ent->areanum2 = 0;
-
- //get all leafs, including solids
- num_leafs = CM_BoxLeafnums (ent->absmin, ent->absmax,
- leafs, MAX_TOTAL_ENT_LEAFS, &topnode);
-
- // set areas
- for (i=0 ; i<num_leafs ; i++)
- {
- clusters[i] = CM_LeafCluster (leafs[i]);
- area = CM_LeafArea (leafs[i]);
- if (area)
- { // doors may legally straggle two areas,
- // but nothing should evern need more than that
- if (ent->areanum && ent->areanum != area)
- {
- if (ent->areanum2 && ent->areanum2 != area && sv.state == ss_loading)
- Com_DPrintf ("Object touching 3 areas at %f %f %f\n",
- ent->absmin[0], ent->absmin[1], ent->absmin[2]);
- ent->areanum2 = area;
- }
- else
- ent->areanum = area;
- }
- }
-
- if (num_leafs >= MAX_TOTAL_ENT_LEAFS)
- { // assume we missed some leafs, and mark by headnode
- ent->num_clusters = -1;
- ent->headnode = topnode;
- }
- else
- {
- ent->num_clusters = 0;
- for (i=0 ; i<num_leafs ; i++)
- {
- if (clusters[i] == -1)
- continue; // not a visible leaf
- for (j=0 ; j<i ; j++)
- if (clusters[j] == clusters[i])
- break;
- if (j == i)
- {
- if (ent->num_clusters == MAX_ENT_CLUSTERS)
- { // assume we missed some leafs, and mark by headnode
- ent->num_clusters = -1;
- ent->headnode = topnode;
- break;
- }
-
- ent->clusternums[ent->num_clusters++] = clusters[i];
- }
- }
- }
-
- // if first time, make sure old_origin is valid
- if (!ent->linkcount)
- {
- VectorCopy (ent->s.origin, ent->s.old_origin);
- }
- ent->linkcount++;
-
- if (ent->solid == SOLID_NOT)
- return;
-
- // find the first node that the ent's box crosses
- node = sv_areanodes;
- while (1)
- {
- if (node->axis == -1)
- break;
- if (ent->absmin[node->axis] > node->dist)
- node = node->children[0];
- else if (ent->absmax[node->axis] < node->dist)
- node = node->children[1];
- else
- break; // crosses the node
- }
-
- // link it in
- if (ent->solid == SOLID_TRIGGER)
- InsertLinkBefore (&ent->area, &node->trigger_edicts);
- else
- InsertLinkBefore (&ent->area, &node->solid_edicts);
-
- }
-
-
- /*
- ====================
- SV_AreaEdicts_r
-
- ====================
- */
- void SV_AreaEdicts_r (areanode_t *node)
- {
- link_t *l, *next, *start;
- edict_t *check;
- int count;
-
- count = 0;
-
- // touch linked edicts
- if (area_type == AREA_SOLID)
- start = &node->solid_edicts;
- else
- start = &node->trigger_edicts;
-
- for (l=start->next ; l != start ; l = next)
- {
- next = l->next;
- check = EDICT_FROM_AREA(l);
-
- if (check->solid == SOLID_NOT)
- continue; // deactivated
- if (check->absmin[0] > area_maxs[0]
- || check->absmin[1] > area_maxs[1]
- || check->absmin[2] > area_maxs[2]
- || check->absmax[0] < area_mins[0]
- || check->absmax[1] < area_mins[1]
- || check->absmax[2] < area_mins[2])
- continue; // not touching
-
- if (area_count == area_maxcount)
- {
- Com_Printf ("SV_AreaEdicts: MAXCOUNT\n");
- return;
- }
-
- area_list[area_count] = check;
- area_count++;
- }
-
- if (node->axis == -1)
- return; // terminal node
-
- // recurse down both sides
- if ( area_maxs[node->axis] > node->dist )
- SV_AreaEdicts_r ( node->children[0] );
- if ( area_mins[node->axis] < node->dist )
- SV_AreaEdicts_r ( node->children[1] );
- }
-
- /*
- ================
- SV_AreaEdicts
- ================
- */
- int SV_AreaEdicts (vec3_t mins, vec3_t maxs, edict_t **list,
- int maxcount, int areatype)
- {
- area_mins = mins;
- area_maxs = maxs;
- area_list = list;
- area_count = 0;
- area_maxcount = maxcount;
- area_type = areatype;
-
- SV_AreaEdicts_r (sv_areanodes);
-
- return area_count;
- }
-
-
- //===========================================================================
-
- /*
- =============
- SV_PointContents
- =============
- */
- int SV_PointContents (vec3_t p)
- {
- edict_t *touch[MAX_EDICTS], *hit;
- int i, num;
- int contents, c2;
- int headnode;
- float *angles;
-
- // get base contents from world
- contents = CM_PointContents (p, sv.models[1]->headnode);
-
- // or in contents from all the other entities
- num = SV_AreaEdicts (p, p, touch, MAX_EDICTS, AREA_SOLID);
-
- for (i=0 ; i<num ; i++)
- {
- hit = touch[i];
-
- // might intersect, so do an exact clip
- headnode = SV_HullForEntity (hit);
- angles = hit->s.angles;
- if (hit->solid != SOLID_BSP)
- angles = vec3_origin; // boxes don't rotate
-
- c2 = CM_TransformedPointContents (p, headnode, hit->s.origin, hit->s.angles);
-
- contents |= c2;
- }
-
- return contents;
- }
-
-
-
- typedef struct
- {
- vec3_t boxmins, boxmaxs;// enclose the test object along entire move
- float *mins, *maxs; // size of the moving object
- vec3_t mins2, maxs2; // size when clipping against mosnters
- float *start, *end;
- trace_t trace;
- edict_t *passedict;
- int contentmask;
- } moveclip_t;
-
-
-
- /*
- ================
- SV_HullForEntity
-
- Returns a headnode that can be used for testing or clipping an
- object of mins/maxs size.
- Offset is filled in to contain the adjustment that must be added to the
- testing object's origin to get a point to use with the returned hull.
- ================
- */
- int SV_HullForEntity (edict_t *ent)
- {
- cmodel_t *model;
-
- // decide which clipping hull to use, based on the size
- if (ent->solid == SOLID_BSP)
- { // explicit hulls in the BSP model
- model = sv.models[ ent->s.modelindex ];
-
- if (!model)
- Com_Error (ERR_FATAL, "MOVETYPE_PUSH with a non bsp model");
-
- return model->headnode;
- }
-
- // create a temp hull from bounding box sizes
-
- return CM_HeadnodeForBox (ent->mins, ent->maxs);
- }
-
-
- //===========================================================================
-
- /*
- ====================
- SV_ClipMoveToEntities
-
- ====================
- */
- void SV_ClipMoveToEntities ( moveclip_t *clip )
- {
- int i, num;
- edict_t *touchlist[MAX_EDICTS], *touch;
- trace_t trace;
- int headnode;
- float *angles;
-
- num = SV_AreaEdicts (clip->boxmins, clip->boxmaxs, touchlist
- , MAX_EDICTS, AREA_SOLID);
-
- // be careful, it is possible to have an entity in this
- // list removed before we get to it (killtriggered)
- for (i=0 ; i<num ; i++)
- {
- touch = touchlist[i];
- if (touch->solid == SOLID_NOT)
- continue;
- if (touch == clip->passedict)
- continue;
- if (clip->trace.allsolid)
- return;
- if (clip->passedict)
- {
- if (touch->owner == clip->passedict)
- continue; // don't clip against own missiles
- if (clip->passedict->owner == touch)
- continue; // don't clip against owner
- }
-
- if ( !(clip->contentmask & CONTENTS_DEADMONSTER)
- && (touch->svflags & SVF_DEADMONSTER) )
- continue;
-
- // might intersect, so do an exact clip
- headnode = SV_HullForEntity (touch);
- angles = touch->s.angles;
- if (touch->solid != SOLID_BSP)
- angles = vec3_origin; // boxes don't rotate
-
- if (touch->svflags & SVF_MONSTER)
- trace = CM_TransformedBoxTrace (clip->start, clip->end,
- clip->mins2, clip->maxs2, headnode, clip->contentmask,
- touch->s.origin, angles);
- else
- trace = CM_TransformedBoxTrace (clip->start, clip->end,
- clip->mins, clip->maxs, headnode, clip->contentmask,
- touch->s.origin, angles);
-
- if (trace.allsolid || trace.startsolid ||
- trace.fraction < clip->trace.fraction)
- {
- trace.ent = touch;
- if (clip->trace.startsolid)
- {
- clip->trace = trace;
- clip->trace.startsolid = true;
- }
- else
- clip->trace = trace;
- }
- else if (trace.startsolid)
- clip->trace.startsolid = true;
- }
- }
-
-
- /*
- ==================
- SV_TraceBounds
- ==================
- */
- void SV_TraceBounds (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, vec3_t boxmins, vec3_t boxmaxs)
- {
- #if 0
- // debug to test against everything
- boxmins[0] = boxmins[1] = boxmins[2] = -9999;
- boxmaxs[0] = boxmaxs[1] = boxmaxs[2] = 9999;
- #else
- int i;
-
- for (i=0 ; i<3 ; i++)
- {
- if (end[i] > start[i])
- {
- boxmins[i] = start[i] + mins[i] - 1;
- boxmaxs[i] = end[i] + maxs[i] + 1;
- }
- else
- {
- boxmins[i] = end[i] + mins[i] - 1;
- boxmaxs[i] = start[i] + maxs[i] + 1;
- }
- }
- #endif
- }
-
- /*
- ==================
- SV_Trace
-
- Moves the given mins/maxs volume through the world from start to end.
-
- Passedict and edicts owned by passedict are explicitly not checked.
-
- ==================
- */
- trace_t SV_Trace (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, edict_t *passedict, int contentmask)
- {
- moveclip_t clip;
-
- if (!mins)
- mins = vec3_origin;
- if (!maxs)
- maxs = vec3_origin;
-
- memset ( &clip, 0, sizeof ( moveclip_t ) );
-
- // clip to world
- clip.trace = CM_BoxTrace (start, end, mins, maxs, 0, contentmask);
- clip.trace.ent = ge->edicts;
- if (clip.trace.fraction == 0)
- return clip.trace; // blocked by the world
-
- clip.contentmask = contentmask;
- clip.start = start;
- clip.end = end;
- clip.mins = mins;
- clip.maxs = maxs;
- clip.passedict = passedict;
-
- VectorCopy (mins, clip.mins2);
- VectorCopy (maxs, clip.maxs2);
-
- // create the bounding box of the entire move
- SV_TraceBounds ( start, clip.mins2, clip.maxs2, end, clip.boxmins, clip.boxmaxs );
-
- // clip to other solid entities
- SV_ClipMoveToEntities ( &clip );
-
- return clip.trace;
- }
-
-