mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-12-13 22:21:34 +00:00
659 lines
14 KiB
C
659 lines
14 KiB
C
/*
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Copyright (C) 1997-2001 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// world.c -- world query functions
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#include "server.h"
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/*
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===============================================================================
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ENTITY AREA CHECKING
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FIXME: this use of "area" is different from the bsp file use
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===============================================================================
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*/
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// (type *)STRUCT_FROM_LINK(link_t *link, type, member)
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// ent = STRUCT_FROM_LINK(link,entity_t,order)
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// FIXME: remove this mess!
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#define STRUCT_FROM_LINK(l,t,m) ((t *)((byte *)l - (int)&(((t *)0)->m)))
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#define EDICT_FROM_AREA(l) STRUCT_FROM_LINK(l,edict_t,area)
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typedef struct areanode_s
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{
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int axis; // -1 = leaf node
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float dist;
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struct areanode_s *children[2];
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link_t trigger_edicts;
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link_t solid_edicts;
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} areanode_t;
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#define AREA_DEPTH 4
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#define AREA_NODES 32
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areanode_t sv_areanodes[AREA_NODES];
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int sv_numareanodes;
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float *area_mins, *area_maxs;
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edict_t **area_list;
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int area_count, area_maxcount;
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int area_type;
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int SV_HullForEntity (edict_t *ent);
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// ClearLink is used for new headnodes
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void ClearLink (link_t *l)
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{
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l->prev = l->next = l;
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}
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void RemoveLink (link_t *l)
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{
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l->next->prev = l->prev;
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l->prev->next = l->next;
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}
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void InsertLinkBefore (link_t *l, link_t *before)
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{
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l->next = before;
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l->prev = before->prev;
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l->prev->next = l;
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l->next->prev = l;
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}
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/*
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===============
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SV_CreateAreaNode
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Builds a uniformly subdivided tree for the given world size
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===============
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*/
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areanode_t *SV_CreateAreaNode (int depth, vec3_t mins, vec3_t maxs)
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{
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areanode_t *anode;
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vec3_t size;
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vec3_t mins1, maxs1, mins2, maxs2;
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anode = &sv_areanodes[sv_numareanodes];
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sv_numareanodes++;
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ClearLink (&anode->trigger_edicts);
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ClearLink (&anode->solid_edicts);
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if (depth == AREA_DEPTH)
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{
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anode->axis = -1;
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anode->children[0] = anode->children[1] = NULL;
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return anode;
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}
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VectorSubtract (maxs, mins, size);
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if (size[0] > size[1])
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anode->axis = 0;
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else
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anode->axis = 1;
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anode->dist = 0.5 * (maxs[anode->axis] + mins[anode->axis]);
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VectorCopy (mins, mins1);
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VectorCopy (mins, mins2);
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VectorCopy (maxs, maxs1);
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VectorCopy (maxs, maxs2);
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maxs1[anode->axis] = mins2[anode->axis] = anode->dist;
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anode->children[0] = SV_CreateAreaNode (depth+1, mins2, maxs2);
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anode->children[1] = SV_CreateAreaNode (depth+1, mins1, maxs1);
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return anode;
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}
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/*
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===============
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SV_ClearWorld
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===============
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*/
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void SV_ClearWorld (void)
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{
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memset (sv_areanodes, 0, sizeof(sv_areanodes));
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sv_numareanodes = 0;
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SV_CreateAreaNode (0, sv.models[1]->mins, sv.models[1]->maxs);
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}
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/*
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===============
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SV_UnlinkEdict
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===============
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*/
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void SV_UnlinkEdict (edict_t *ent)
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{
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if (!ent->area.prev)
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return; // not linked in anywhere
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RemoveLink (&ent->area);
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ent->area.prev = ent->area.next = NULL;
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}
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/*
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===============
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SV_LinkEdict
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===============
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*/
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#define MAX_TOTAL_ENT_LEAFS 128
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void SV_LinkEdict (edict_t *ent)
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{
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areanode_t *node;
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int leafs[MAX_TOTAL_ENT_LEAFS];
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int clusters[MAX_TOTAL_ENT_LEAFS];
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int num_leafs;
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int i, j, k;
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int area;
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int topnode;
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if (ent->area.prev)
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SV_UnlinkEdict (ent); // unlink from old position
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if (ent == ge->edicts)
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return; // don't add the world
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if (!ent->inuse)
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return;
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// set the size
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VectorSubtract (ent->maxs, ent->mins, ent->size);
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// encode the size into the entity_state for client prediction
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if (ent->solid == SOLID_BBOX && !(ent->svflags & SVF_DEADMONSTER))
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{ // assume that x/y are equal and symetric
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i = ent->maxs[0]/8;
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if (i<1)
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i = 1;
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if (i>31)
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i = 31;
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// z is not symetric
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j = (-ent->mins[2])/8;
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if (j<1)
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j = 1;
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if (j>31)
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j = 31;
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// and z maxs can be negative...
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k = (ent->maxs[2]+32)/8;
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if (k<1)
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k = 1;
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if (k>63)
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k = 63;
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ent->s.solid = (k<<10) | (j<<5) | i;
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}
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else if (ent->solid == SOLID_BSP)
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{
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ent->s.solid = 31; // a solid_bbox will never create this value
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}
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else
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ent->s.solid = 0;
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// set the abs box
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if (ent->solid == SOLID_BSP &&
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(ent->s.angles[0] || ent->s.angles[1] || ent->s.angles[2]) )
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{ // expand for rotation
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float max, v;
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int i;
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max = 0;
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for (i=0 ; i<3 ; i++)
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{
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v =fabs( ent->mins[i]);
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if (v > max)
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max = v;
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v =fabs( ent->maxs[i]);
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if (v > max)
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max = v;
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}
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for (i=0 ; i<3 ; i++)
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{
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ent->absmin[i] = ent->s.origin[i] - max;
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ent->absmax[i] = ent->s.origin[i] + max;
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}
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}
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else
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{ // normal
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VectorAdd (ent->s.origin, ent->mins, ent->absmin);
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VectorAdd (ent->s.origin, ent->maxs, ent->absmax);
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}
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// because movement is clipped an epsilon away from an actual edge,
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// we must fully check even when bounding boxes don't quite touch
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ent->absmin[0] -= 1;
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ent->absmin[1] -= 1;
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ent->absmin[2] -= 1;
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ent->absmax[0] += 1;
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ent->absmax[1] += 1;
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ent->absmax[2] += 1;
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// link to PVS leafs
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ent->num_clusters = 0;
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ent->areanum = 0;
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ent->areanum2 = 0;
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//get all leafs, including solids
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num_leafs = CM_BoxLeafnums (ent->absmin, ent->absmax,
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leafs, MAX_TOTAL_ENT_LEAFS, &topnode);
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// set areas
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for (i=0 ; i<num_leafs ; i++)
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{
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clusters[i] = CM_LeafCluster (leafs[i]);
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area = CM_LeafArea (leafs[i]);
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if (area)
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{ // doors may legally straggle two areas,
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// but nothing should evern need more than that
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if (ent->areanum && ent->areanum != area)
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{
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if (ent->areanum2 && ent->areanum2 != area && sv.state == ss_loading)
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Com_DPrintf ("Object touching 3 areas at %f %f %f\n",
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ent->absmin[0], ent->absmin[1], ent->absmin[2]);
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ent->areanum2 = area;
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}
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else
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ent->areanum = area;
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}
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}
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if (num_leafs >= MAX_TOTAL_ENT_LEAFS)
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{ // assume we missed some leafs, and mark by headnode
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ent->num_clusters = -1;
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ent->headnode = topnode;
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}
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else
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{
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ent->num_clusters = 0;
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for (i=0 ; i<num_leafs ; i++)
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{
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if (clusters[i] == -1)
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continue; // not a visible leaf
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for (j=0 ; j<i ; j++)
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if (clusters[j] == clusters[i])
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break;
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if (j == i)
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{
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if (ent->num_clusters == MAX_ENT_CLUSTERS)
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{ // assume we missed some leafs, and mark by headnode
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ent->num_clusters = -1;
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ent->headnode = topnode;
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break;
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}
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ent->clusternums[ent->num_clusters++] = clusters[i];
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}
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}
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}
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// if first time, make sure old_origin is valid
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if (!ent->linkcount)
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{
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VectorCopy (ent->s.origin, ent->s.old_origin);
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}
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ent->linkcount++;
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if (ent->solid == SOLID_NOT)
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return;
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// find the first node that the ent's box crosses
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node = sv_areanodes;
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while (1)
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{
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if (node->axis == -1)
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break;
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if (ent->absmin[node->axis] > node->dist)
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node = node->children[0];
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else if (ent->absmax[node->axis] < node->dist)
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node = node->children[1];
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else
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break; // crosses the node
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}
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// link it in
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if (ent->solid == SOLID_TRIGGER)
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InsertLinkBefore (&ent->area, &node->trigger_edicts);
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else
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InsertLinkBefore (&ent->area, &node->solid_edicts);
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}
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/*
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====================
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SV_AreaEdicts_r
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====================
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*/
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void SV_AreaEdicts_r (areanode_t *node)
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{
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link_t *l, *next, *start;
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edict_t *check;
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int count;
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count = 0;
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// touch linked edicts
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if (area_type == AREA_SOLID)
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start = &node->solid_edicts;
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else
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start = &node->trigger_edicts;
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for (l=start->next ; l != start ; l = next)
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{
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next = l->next;
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check = EDICT_FROM_AREA(l);
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if (check->solid == SOLID_NOT)
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continue; // deactivated
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if (check->absmin[0] > area_maxs[0]
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|| check->absmin[1] > area_maxs[1]
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|| check->absmin[2] > area_maxs[2]
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|| check->absmax[0] < area_mins[0]
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|| check->absmax[1] < area_mins[1]
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|| check->absmax[2] < area_mins[2])
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continue; // not touching
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if (area_count == area_maxcount)
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{
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Com_Printf ("SV_AreaEdicts: MAXCOUNT\n");
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return;
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}
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area_list[area_count] = check;
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area_count++;
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}
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if (node->axis == -1)
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return; // terminal node
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// recurse down both sides
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if ( area_maxs[node->axis] > node->dist )
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SV_AreaEdicts_r ( node->children[0] );
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if ( area_mins[node->axis] < node->dist )
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SV_AreaEdicts_r ( node->children[1] );
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}
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/*
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================
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SV_AreaEdicts
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================
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*/
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int SV_AreaEdicts (vec3_t mins, vec3_t maxs, edict_t **list,
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int maxcount, int areatype)
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{
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area_mins = mins;
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area_maxs = maxs;
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area_list = list;
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area_count = 0;
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area_maxcount = maxcount;
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area_type = areatype;
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SV_AreaEdicts_r (sv_areanodes);
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return area_count;
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}
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//===========================================================================
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/*
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=============
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SV_PointContents
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=============
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*/
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int SV_PointContents (vec3_t p)
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{
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edict_t *touch[MAX_EDICTS], *hit;
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int i, num;
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int contents, c2;
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int headnode;
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float *angles;
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// get base contents from world
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contents = CM_PointContents (p, sv.models[1]->headnode);
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// or in contents from all the other entities
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num = SV_AreaEdicts (p, p, touch, MAX_EDICTS, AREA_SOLID);
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for (i=0 ; i<num ; i++)
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{
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hit = touch[i];
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// might intersect, so do an exact clip
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headnode = SV_HullForEntity (hit);
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angles = hit->s.angles;
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if (hit->solid != SOLID_BSP)
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angles = vec3_origin; // boxes don't rotate
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c2 = CM_TransformedPointContents (p, headnode, hit->s.origin, hit->s.angles);
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contents |= c2;
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}
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return contents;
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}
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typedef struct
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{
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vec3_t boxmins, boxmaxs;// enclose the test object along entire move
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float *mins, *maxs; // size of the moving object
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vec3_t mins2, maxs2; // size when clipping against mosnters
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float *start, *end;
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trace_t trace;
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edict_t *passedict;
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int contentmask;
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} moveclip_t;
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/*
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================
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SV_HullForEntity
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Returns a headnode that can be used for testing or clipping an
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object of mins/maxs size.
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Offset is filled in to contain the adjustment that must be added to the
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testing object's origin to get a point to use with the returned hull.
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================
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*/
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int SV_HullForEntity (edict_t *ent)
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{
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cmodel_t *model;
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// decide which clipping hull to use, based on the size
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if (ent->solid == SOLID_BSP)
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{ // explicit hulls in the BSP model
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model = sv.models[ ent->s.modelindex ];
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if (!model)
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Com_Error (ERR_FATAL, "MOVETYPE_PUSH with a non bsp model");
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return model->headnode;
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}
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// create a temp hull from bounding box sizes
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return CM_HeadnodeForBox (ent->mins, ent->maxs);
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}
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//===========================================================================
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/*
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====================
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SV_ClipMoveToEntities
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====================
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*/
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void SV_ClipMoveToEntities ( moveclip_t *clip )
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{
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int i, num;
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edict_t *touchlist[MAX_EDICTS], *touch;
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trace_t trace;
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int headnode;
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float *angles;
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num = SV_AreaEdicts (clip->boxmins, clip->boxmaxs, touchlist
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, MAX_EDICTS, AREA_SOLID);
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// be careful, it is possible to have an entity in this
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// list removed before we get to it (killtriggered)
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for (i=0 ; i<num ; i++)
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{
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touch = touchlist[i];
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if (touch->solid == SOLID_NOT)
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continue;
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if (touch == clip->passedict)
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continue;
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if (clip->trace.allsolid)
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return;
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if (clip->passedict)
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{
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if (touch->owner == clip->passedict)
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continue; // don't clip against own missiles
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if (clip->passedict->owner == touch)
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continue; // don't clip against owner
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}
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if ( !(clip->contentmask & CONTENTS_DEADMONSTER)
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&& (touch->svflags & SVF_DEADMONSTER) )
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continue;
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// might intersect, so do an exact clip
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headnode = SV_HullForEntity (touch);
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angles = touch->s.angles;
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if (touch->solid != SOLID_BSP)
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angles = vec3_origin; // boxes don't rotate
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if (touch->svflags & SVF_MONSTER)
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trace = CM_TransformedBoxTrace (clip->start, clip->end,
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clip->mins2, clip->maxs2, headnode, clip->contentmask,
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touch->s.origin, angles);
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else
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trace = CM_TransformedBoxTrace (clip->start, clip->end,
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clip->mins, clip->maxs, headnode, clip->contentmask,
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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;
|
|
}
|
|
|