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- /*
- Copyright (C) 1996-1997 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.
-
- */
- #include "quakedef.h"
-
- static hull_t box_hull;
- static dclipnode_t box_clipnodes[6];
- static mplane_t box_planes[6];
-
- extern vec3_t player_mins;
- extern vec3_t player_maxs;
-
- /*
- ===================
- PM_InitBoxHull
-
- Set up the planes and clipnodes so that the six floats of a bounding box
- can just be stored out and get a proper hull_t structure.
- ===================
- */
- void PM_InitBoxHull (void)
- {
- int i;
- int side;
-
- box_hull.clipnodes = box_clipnodes;
- box_hull.planes = box_planes;
- box_hull.firstclipnode = 0;
- box_hull.lastclipnode = 5;
-
- for (i=0 ; i<6 ; i++)
- {
- box_clipnodes[i].planenum = i;
-
- side = i&1;
-
- box_clipnodes[i].children[side] = CONTENTS_EMPTY;
- if (i != 5)
- box_clipnodes[i].children[side^1] = i + 1;
- else
- box_clipnodes[i].children[side^1] = CONTENTS_SOLID;
-
- box_planes[i].type = i>>1;
- box_planes[i].normal[i>>1] = 1;
- }
-
- }
-
-
- /*
- ===================
- PM_HullForBox
-
- To keep everything totally uniform, bounding boxes are turned into small
- BSP trees instead of being compared directly.
- ===================
- */
- hull_t *PM_HullForBox (vec3_t mins, vec3_t maxs)
- {
- box_planes[0].dist = maxs[0];
- box_planes[1].dist = mins[0];
- box_planes[2].dist = maxs[1];
- box_planes[3].dist = mins[1];
- box_planes[4].dist = maxs[2];
- box_planes[5].dist = mins[2];
-
- return &box_hull;
- }
-
-
- /*
- ==================
- PM_HullPointContents
-
- ==================
- */
- int PM_HullPointContents (hull_t *hull, int num, vec3_t p)
- {
- float d;
- dclipnode_t *node;
- mplane_t *plane;
-
- while (num >= 0)
- {
- if (num < hull->firstclipnode || num > hull->lastclipnode)
- Sys_Error ("PM_HullPointContents: bad node number");
-
- node = hull->clipnodes + num;
- plane = hull->planes + node->planenum;
-
- if (plane->type < 3)
- d = p[plane->type] - plane->dist;
- else
- d = DotProduct (plane->normal, p) - plane->dist;
- if (d < 0)
- num = node->children[1];
- else
- num = node->children[0];
- }
-
- return num;
- }
-
- /*
- ==================
- PM_PointContents
-
- ==================
- */
- int PM_PointContents (vec3_t p)
- {
- float d;
- dclipnode_t *node;
- mplane_t *plane;
- hull_t *hull;
- int num;
-
- hull = &pmove.physents[0].model->hulls[0];
-
- num = hull->firstclipnode;
-
- while (num >= 0)
- {
- if (num < hull->firstclipnode || num > hull->lastclipnode)
- Sys_Error ("PM_HullPointContents: bad node number");
-
- node = hull->clipnodes + num;
- plane = hull->planes + node->planenum;
-
- if (plane->type < 3)
- d = p[plane->type] - plane->dist;
- else
- d = DotProduct (plane->normal, p) - plane->dist;
- if (d < 0)
- num = node->children[1];
- else
- num = node->children[0];
- }
-
- return num;
- }
-
- /*
- ===============================================================================
-
- LINE TESTING IN HULLS
-
- ===============================================================================
- */
-
- // 1/32 epsilon to keep floating point happy
- #define DIST_EPSILON (0.03125)
-
- /*
- ==================
- PM_RecursiveHullCheck
-
- ==================
- */
- qboolean PM_RecursiveHullCheck (hull_t *hull, int num, float p1f, float p2f, vec3_t p1, vec3_t p2, pmtrace_t *trace)
- {
- dclipnode_t *node;
- mplane_t *plane;
- float t1, t2;
- float frac;
- int i;
- vec3_t mid;
- int side;
- float midf;
-
- // check for empty
- if (num < 0)
- {
- if (num != CONTENTS_SOLID)
- {
- trace->allsolid = false;
- if (num == CONTENTS_EMPTY)
- trace->inopen = true;
- else
- trace->inwater = true;
- }
- else
- trace->startsolid = true;
- return true; // empty
- }
-
- if (num < hull->firstclipnode || num > hull->lastclipnode)
- Sys_Error ("PM_RecursiveHullCheck: bad node number");
-
- //
- // find the point distances
- //
- node = hull->clipnodes + num;
- plane = hull->planes + node->planenum;
-
- if (plane->type < 3)
- {
- t1 = p1[plane->type] - plane->dist;
- t2 = p2[plane->type] - plane->dist;
- }
- else
- {
- t1 = DotProduct (plane->normal, p1) - plane->dist;
- t2 = DotProduct (plane->normal, p2) - plane->dist;
- }
-
- #if 1
- if (t1 >= 0 && t2 >= 0)
- return PM_RecursiveHullCheck (hull, node->children[0], p1f, p2f, p1, p2, trace);
- if (t1 < 0 && t2 < 0)
- return PM_RecursiveHullCheck (hull, node->children[1], p1f, p2f, p1, p2, trace);
- #else
- if ( (t1 >= DIST_EPSILON && t2 >= DIST_EPSILON) || (t2 > t1 && t1 >= 0) )
- return PM_RecursiveHullCheck (hull, node->children[0], p1f, p2f, p1, p2, trace);
- if ( (t1 <= -DIST_EPSILON && t2 <= -DIST_EPSILON) || (t2 < t1 && t1 <= 0) )
- return PM_RecursiveHullCheck (hull, node->children[1], p1f, p2f, p1, p2, trace);
- #endif
-
- // put the crosspoint DIST_EPSILON pixels on the near side
- if (t1 < 0)
- frac = (t1 + DIST_EPSILON)/(t1-t2);
- else
- frac = (t1 - DIST_EPSILON)/(t1-t2);
- if (frac < 0)
- frac = 0;
- if (frac > 1)
- frac = 1;
-
- midf = p1f + (p2f - p1f)*frac;
- for (i=0 ; i<3 ; i++)
- mid[i] = p1[i] + frac*(p2[i] - p1[i]);
-
- side = (t1 < 0);
-
- // move up to the node
- if (!PM_RecursiveHullCheck (hull, node->children[side], p1f, midf, p1, mid, trace) )
- return false;
-
- #ifdef PARANOID
- if (PM_HullPointContents (pm_hullmodel, mid, node->children[side])
- == CONTENTS_SOLID)
- {
- Con_Printf ("mid PointInHullSolid\n");
- return false;
- }
- #endif
-
- if (PM_HullPointContents (hull, node->children[side^1], mid)
- != CONTENTS_SOLID)
- // go past the node
- return PM_RecursiveHullCheck (hull, node->children[side^1], midf, p2f, mid, p2, trace);
-
- if (trace->allsolid)
- return false; // never got out of the solid area
-
- //==================
- // the other side of the node is solid, this is the impact point
- //==================
- if (!side)
- {
- VectorCopy (plane->normal, trace->plane.normal);
- trace->plane.dist = plane->dist;
- }
- else
- {
- VectorSubtract (vec3_origin, plane->normal, trace->plane.normal);
- trace->plane.dist = -plane->dist;
- }
-
- while (PM_HullPointContents (hull, hull->firstclipnode, mid)
- == CONTENTS_SOLID)
- { // shouldn't really happen, but does occasionally
- frac -= 0.1;
- if (frac < 0)
- {
- trace->fraction = midf;
- VectorCopy (mid, trace->endpos);
- Con_DPrintf ("backup past 0\n");
- return false;
- }
- midf = p1f + (p2f - p1f)*frac;
- for (i=0 ; i<3 ; i++)
- mid[i] = p1[i] + frac*(p2[i] - p1[i]);
- }
-
- trace->fraction = midf;
- VectorCopy (mid, trace->endpos);
-
- return false;
- }
-
-
- /*
- ================
- PM_TestPlayerPosition
-
- Returns false if the given player position is not valid (in solid)
- ================
- */
- qboolean PM_TestPlayerPosition (vec3_t pos)
- {
- int i;
- physent_t *pe;
- vec3_t mins, maxs, test;
- hull_t *hull;
-
- for (i=0 ; i< pmove.numphysent ; i++)
- {
- pe = &pmove.physents[i];
- // get the clipping hull
- if (pe->model)
- hull = &pmove.physents[i].model->hulls[1];
- else
- {
- VectorSubtract (pe->mins, player_maxs, mins);
- VectorSubtract (pe->maxs, player_mins, maxs);
- hull = PM_HullForBox (mins, maxs);
- }
-
- VectorSubtract (pos, pe->origin, test);
-
- if (PM_HullPointContents (hull, hull->firstclipnode, test) == CONTENTS_SOLID)
- return false;
- }
-
- return true;
- }
-
- /*
- ================
- PM_PlayerMove
- ================
- */
- pmtrace_t PM_PlayerMove (vec3_t start, vec3_t end)
- {
- pmtrace_t trace, total;
- vec3_t offset;
- vec3_t start_l, end_l;
- hull_t *hull;
- int i;
- physent_t *pe;
- vec3_t mins, maxs;
-
- // fill in a default trace
- memset (&total, 0, sizeof(pmtrace_t));
- total.fraction = 1;
- total.ent = -1;
- VectorCopy (end, total.endpos);
-
- for (i=0 ; i< pmove.numphysent ; i++)
- {
- pe = &pmove.physents[i];
- // get the clipping hull
- if (pe->model)
- hull = &pmove.physents[i].model->hulls[1];
- else
- {
- VectorSubtract (pe->mins, player_maxs, mins);
- VectorSubtract (pe->maxs, player_mins, maxs);
- hull = PM_HullForBox (mins, maxs);
- }
-
- // PM_HullForEntity (ent, mins, maxs, offset);
- VectorCopy (pe->origin, offset);
-
- VectorSubtract (start, offset, start_l);
- VectorSubtract (end, offset, end_l);
-
- // fill in a default trace
- memset (&trace, 0, sizeof(pmtrace_t));
- trace.fraction = 1;
- trace.allsolid = true;
- // trace.startsolid = true;
- VectorCopy (end, trace.endpos);
-
- // trace a line through the apropriate clipping hull
- PM_RecursiveHullCheck (hull, hull->firstclipnode, 0, 1, start_l, end_l, &trace);
-
- if (trace.allsolid)
- trace.startsolid = true;
- if (trace.startsolid)
- trace.fraction = 0;
-
- // did we clip the move?
- if (trace.fraction < total.fraction)
- {
- // fix trace up by the offset
- VectorAdd (trace.endpos, offset, trace.endpos);
- total = trace;
- total.ent = i;
- }
-
- }
-
- return total;
- }
-
-
-