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https://github.com/UberGames/ioef.git
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1657 lines
35 KiB
C
1657 lines
35 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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 Foobar; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "vis.h"
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/*
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each portal will have a list of all possible to see from first portal
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if (!thread->portalmightsee[portalnum])
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portal mightsee
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for p2 = all other portals in leaf
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get sperating planes
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for all portals that might be seen by p2
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mark as unseen if not present in seperating plane
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flood fill a new mightsee
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save as passagemightsee
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void CalcMightSee (leaf_t *leaf,
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*/
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int CountBits (byte *bits, int numbits)
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{
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int i;
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int c;
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c = 0;
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for (i=0 ; i<numbits ; i++)
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if (bits[i>>3] & (1<<(i&7)) )
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c++;
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return c;
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}
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int c_fullskip;
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int c_portalskip, c_leafskip;
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int c_vistest, c_mighttest;
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int c_chop, c_nochop;
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int active;
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void CheckStack (leaf_t *leaf, threaddata_t *thread)
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{
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pstack_t *p, *p2;
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for (p=thread->pstack_head.next ; p ; p=p->next)
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{
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// _printf ("=");
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if (p->leaf == leaf)
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Error ("CheckStack: leaf recursion");
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for (p2=thread->pstack_head.next ; p2 != p ; p2=p2->next)
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if (p2->leaf == p->leaf)
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Error ("CheckStack: late leaf recursion");
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}
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// _printf ("\n");
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}
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winding_t *AllocStackWinding (pstack_t *stack)
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{
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int i;
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for (i=0 ; i<3 ; i++)
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{
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if (stack->freewindings[i])
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{
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stack->freewindings[i] = 0;
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return &stack->windings[i];
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}
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}
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Error ("AllocStackWinding: failed");
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return NULL;
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}
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void FreeStackWinding (winding_t *w, pstack_t *stack)
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{
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int i;
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i = w - stack->windings;
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if (i<0 || i>2)
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return; // not from local
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if (stack->freewindings[i])
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Error ("FreeStackWinding: allready free");
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stack->freewindings[i] = 1;
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}
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/*
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==============
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VisChopWinding
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==============
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*/
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winding_t *VisChopWinding (winding_t *in, pstack_t *stack, plane_t *split)
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{
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vec_t dists[128];
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int sides[128];
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int counts[3];
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vec_t dot;
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int i, j;
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vec_t *p1, *p2;
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vec3_t mid;
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winding_t *neww;
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counts[0] = counts[1] = counts[2] = 0;
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// determine sides for each point
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for (i=0 ; i<in->numpoints ; i++)
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{
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dot = DotProduct (in->points[i], split->normal);
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dot -= split->dist;
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dists[i] = dot;
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if (dot > ON_EPSILON)
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sides[i] = SIDE_FRONT;
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else if (dot < -ON_EPSILON)
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sides[i] = SIDE_BACK;
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else
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{
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sides[i] = SIDE_ON;
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}
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counts[sides[i]]++;
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}
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if (!counts[1])
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return in; // completely on front side
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if (!counts[0])
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{
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FreeStackWinding (in, stack);
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return NULL;
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}
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sides[i] = sides[0];
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dists[i] = dists[0];
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neww = AllocStackWinding (stack);
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neww->numpoints = 0;
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for (i=0 ; i<in->numpoints ; i++)
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{
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p1 = in->points[i];
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if (neww->numpoints == MAX_POINTS_ON_FIXED_WINDING)
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{
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FreeStackWinding (neww, stack);
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return in; // can't chop -- fall back to original
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}
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if (sides[i] == SIDE_ON)
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{
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VectorCopy (p1, neww->points[neww->numpoints]);
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neww->numpoints++;
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continue;
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}
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if (sides[i] == SIDE_FRONT)
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{
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VectorCopy (p1, neww->points[neww->numpoints]);
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neww->numpoints++;
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}
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if (sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
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continue;
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if (neww->numpoints == MAX_POINTS_ON_FIXED_WINDING)
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{
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FreeStackWinding (neww, stack);
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return in; // can't chop -- fall back to original
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}
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// generate a split point
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p2 = in->points[(i+1)%in->numpoints];
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dot = dists[i] / (dists[i]-dists[i+1]);
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for (j=0 ; j<3 ; j++)
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{ // avoid round off error when possible
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if (split->normal[j] == 1)
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mid[j] = split->dist;
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else if (split->normal[j] == -1)
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mid[j] = -split->dist;
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else
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mid[j] = p1[j] + dot*(p2[j]-p1[j]);
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}
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VectorCopy (mid, neww->points[neww->numpoints]);
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neww->numpoints++;
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}
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// free the original winding
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FreeStackWinding (in, stack);
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return neww;
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}
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/*
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==============
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ClipToSeperators
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Source, pass, and target are an ordering of portals.
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Generates seperating planes canidates by taking two points from source and one
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point from pass, and clips target by them.
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If target is totally clipped away, that portal can not be seen through.
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Normal clip keeps target on the same side as pass, which is correct if the
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order goes source, pass, target. If the order goes pass, source, target then
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flipclip should be set.
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==============
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*/
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winding_t *ClipToSeperators (winding_t *source, winding_t *pass, winding_t *target, qboolean flipclip, pstack_t *stack)
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{
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int i, j, k, l;
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plane_t plane;
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vec3_t v1, v2;
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float d;
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vec_t length;
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int counts[3];
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qboolean fliptest;
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// check all combinations
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for (i=0 ; i<source->numpoints ; i++)
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{
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l = (i+1)%source->numpoints;
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VectorSubtract (source->points[l] , source->points[i], v1);
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// find a vertex of pass that makes a plane that puts all of the
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// vertexes of pass on the front side and all of the vertexes of
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// source on the back side
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for (j=0 ; j<pass->numpoints ; j++)
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{
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VectorSubtract (pass->points[j], source->points[i], v2);
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plane.normal[0] = v1[1]*v2[2] - v1[2]*v2[1];
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plane.normal[1] = v1[2]*v2[0] - v1[0]*v2[2];
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plane.normal[2] = v1[0]*v2[1] - v1[1]*v2[0];
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// if points don't make a valid plane, skip it
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length = plane.normal[0] * plane.normal[0]
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+ plane.normal[1] * plane.normal[1]
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+ plane.normal[2] * plane.normal[2];
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if (length < ON_EPSILON)
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continue;
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length = 1/sqrt(length);
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plane.normal[0] *= length;
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plane.normal[1] *= length;
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plane.normal[2] *= length;
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plane.dist = DotProduct (pass->points[j], plane.normal);
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//
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// find out which side of the generated seperating plane has the
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// source portal
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//
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#if 1
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fliptest = qfalse;
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for (k=0 ; k<source->numpoints ; k++)
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{
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if (k == i || k == l)
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continue;
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d = DotProduct (source->points[k], plane.normal) - plane.dist;
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if (d < -ON_EPSILON)
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{ // source is on the negative side, so we want all
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// pass and target on the positive side
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fliptest = qfalse;
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break;
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}
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else if (d > ON_EPSILON)
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{ // source is on the positive side, so we want all
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// pass and target on the negative side
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fliptest = qtrue;
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break;
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}
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}
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if (k == source->numpoints)
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continue; // planar with source portal
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#else
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fliptest = flipclip;
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#endif
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//
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// flip the normal if the source portal is backwards
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//
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if (fliptest)
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{
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VectorSubtract (vec3_origin, plane.normal, plane.normal);
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plane.dist = -plane.dist;
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}
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#if 1
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//
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// if all of the pass portal points are now on the positive side,
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// this is the seperating plane
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//
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counts[0] = counts[1] = counts[2] = 0;
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for (k=0 ; k<pass->numpoints ; k++)
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{
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if (k==j)
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continue;
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d = DotProduct (pass->points[k], plane.normal) - plane.dist;
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if (d < -ON_EPSILON)
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break;
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else if (d > ON_EPSILON)
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counts[0]++;
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else
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counts[2]++;
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}
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if (k != pass->numpoints)
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continue; // points on negative side, not a seperating plane
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if (!counts[0])
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continue; // planar with seperating plane
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#else
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k = (j+1)%pass->numpoints;
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d = DotProduct (pass->points[k], plane.normal) - plane.dist;
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if (d < -ON_EPSILON)
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continue;
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k = (j+pass->numpoints-1)%pass->numpoints;
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d = DotProduct (pass->points[k], plane.normal) - plane.dist;
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if (d < -ON_EPSILON)
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continue;
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#endif
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//
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// flip the normal if we want the back side
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//
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if (flipclip)
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{
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VectorSubtract (vec3_origin, plane.normal, plane.normal);
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plane.dist = -plane.dist;
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}
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#ifdef SEPERATORCACHE
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stack->seperators[flipclip][stack->numseperators[flipclip]] = plane;
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if (++stack->numseperators[flipclip] >= MAX_SEPERATORS)
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Error("MAX_SEPERATORS");
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#endif
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//MrE: fast check first
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d = DotProduct (stack->portal->origin, plane.normal) - plane.dist;
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//if completely at the back of the seperator plane
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if (d < -stack->portal->radius)
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return NULL;
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//if completely on the front of the seperator plane
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if (d > stack->portal->radius)
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break;
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//
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// clip target by the seperating plane
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//
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target = VisChopWinding (target, stack, &plane);
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if (!target)
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return NULL; // target is not visible
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break; // optimization by Antony Suter
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}
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}
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return target;
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}
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/*
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==================
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RecursiveLeafFlow
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Flood fill through the leafs
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If src_portal is NULL, this is the originating leaf
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==================
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*/
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void RecursiveLeafFlow (int leafnum, threaddata_t *thread, pstack_t *prevstack)
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{
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pstack_t stack;
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vportal_t *p;
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plane_t backplane;
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leaf_t *leaf;
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int i, j, n;
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long *test, *might, *prevmight, *vis, more;
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int pnum;
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thread->c_chains++;
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leaf = &leafs[leafnum];
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// CheckStack (leaf, thread);
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prevstack->next = &stack;
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stack.next = NULL;
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stack.leaf = leaf;
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stack.portal = NULL;
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stack.depth = prevstack->depth + 1;
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#ifdef SEPERATORCACHE
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stack.numseperators[0] = 0;
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stack.numseperators[1] = 0;
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#endif
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might = (long *)stack.mightsee;
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vis = (long *)thread->base->portalvis;
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// check all portals for flowing into other leafs
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for (i = 0; i < leaf->numportals; i++)
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{
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p = leaf->portals[i];
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if (p->removed)
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continue;
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pnum = p - portals;
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/* MrE: portal trace debug code
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{
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int portaltrace[] = {13, 16, 17, 37};
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pstack_t *s;
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s = &thread->pstack_head;
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for (j = 0; s->next && j < sizeof(portaltrace)/sizeof(int) - 1; j++, s = s->next)
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{
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if (s->portal->num != portaltrace[j])
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break;
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}
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if (j >= sizeof(portaltrace)/sizeof(int) - 1)
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{
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if (p->num == portaltrace[j])
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n = 0; //traced through all the portals
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}
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}
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*/
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if ( ! (prevstack->mightsee[pnum >> 3] & (1<<(pnum&7)) ) )
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{
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continue; // can't possibly see it
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}
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// if the portal can't see anything we haven't allready seen, skip it
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if (p->status == stat_done)
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{
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test = (long *)p->portalvis;
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}
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else
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{
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test = (long *)p->portalflood;
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}
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more = 0;
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prevmight = (long *)prevstack->mightsee;
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for (j=0 ; j<portallongs ; j++)
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{
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might[j] = prevmight[j] & test[j];
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more |= (might[j] & ~vis[j]);
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}
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if (!more &&
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(thread->base->portalvis[pnum>>3] & (1<<(pnum&7))) )
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{ // can't see anything new
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continue;
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}
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// get plane of portal, point normal into the neighbor leaf
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stack.portalplane = p->plane;
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VectorSubtract (vec3_origin, p->plane.normal, backplane.normal);
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backplane.dist = -p->plane.dist;
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// c_portalcheck++;
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stack.portal = p;
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stack.next = NULL;
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stack.freewindings[0] = 1;
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stack.freewindings[1] = 1;
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stack.freewindings[2] = 1;
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#if 1
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{
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float d;
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d = DotProduct (p->origin, thread->pstack_head.portalplane.normal);
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d -= thread->pstack_head.portalplane.dist;
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if (d < -p->radius)
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{
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continue;
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}
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else if (d > p->radius)
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{
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stack.pass = p->winding;
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}
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else
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{
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stack.pass = VisChopWinding (p->winding, &stack, &thread->pstack_head.portalplane);
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if (!stack.pass)
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continue;
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}
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}
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#else
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stack.pass = VisChopWinding (p->winding, &stack, &thread->pstack_head.portalplane);
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if (!stack.pass)
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continue;
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#endif
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#if 1
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{
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float d;
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d = DotProduct (thread->base->origin, p->plane.normal);
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d -= p->plane.dist;
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//MrE: vis-bug fix
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//if (d > p->radius)
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if (d > thread->base->radius)
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{
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continue;
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}
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//MrE: vis-bug fix
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//if (d < -p->radius)
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else if (d < -thread->base->radius)
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{
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stack.source = prevstack->source;
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}
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else
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{
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stack.source = VisChopWinding (prevstack->source, &stack, &backplane);
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//FIXME: shouldn't we create a new source origin and radius for fast checks?
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if (!stack.source)
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continue;
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}
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}
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#else
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stack.source = VisChopWinding (prevstack->source, &stack, &backplane);
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if (!stack.source)
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continue;
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#endif
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if (!prevstack->pass)
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{ // the second leaf can only be blocked if coplanar
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// mark the portal as visible
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thread->base->portalvis[pnum>>3] |= (1<<(pnum&7));
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|
RecursiveLeafFlow (p->leaf, thread, &stack);
|
|
continue;
|
|
}
|
|
|
|
#ifdef SEPERATORCACHE
|
|
if (stack.numseperators[0])
|
|
{
|
|
for (n = 0; n < stack.numseperators[0]; n++)
|
|
{
|
|
stack.pass = VisChopWinding (stack.pass, &stack, &stack.seperators[0][n]);
|
|
if (!stack.pass)
|
|
break; // target is not visible
|
|
}
|
|
if (n < stack.numseperators[0])
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
stack.pass = ClipToSeperators (prevstack->source, prevstack->pass, stack.pass, qfalse, &stack);
|
|
}
|
|
#else
|
|
stack.pass = ClipToSeperators (stack.source, prevstack->pass, stack.pass, qfalse, &stack);
|
|
#endif
|
|
if (!stack.pass)
|
|
continue;
|
|
|
|
#ifdef SEPERATORCACHE
|
|
if (stack.numseperators[1])
|
|
{
|
|
for (n = 0; n < stack.numseperators[1]; n++)
|
|
{
|
|
stack.pass = VisChopWinding (stack.pass, &stack, &stack.seperators[1][n]);
|
|
if (!stack.pass)
|
|
break; // target is not visible
|
|
}
|
|
}
|
|
else
|
|
{
|
|
stack.pass = ClipToSeperators (prevstack->pass, prevstack->source, stack.pass, qtrue, &stack);
|
|
}
|
|
#else
|
|
stack.pass = ClipToSeperators (prevstack->pass, stack.source, stack.pass, qtrue, &stack);
|
|
#endif
|
|
if (!stack.pass)
|
|
continue;
|
|
|
|
// mark the portal as visible
|
|
thread->base->portalvis[pnum>>3] |= (1<<(pnum&7));
|
|
|
|
// flow through it for real
|
|
RecursiveLeafFlow (p->leaf, thread, &stack);
|
|
//
|
|
stack.next = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
===============
|
|
PortalFlow
|
|
|
|
generates the portalvis bit vector
|
|
===============
|
|
*/
|
|
void PortalFlow (int portalnum)
|
|
{
|
|
threaddata_t data;
|
|
int i;
|
|
vportal_t *p;
|
|
int c_might, c_can;
|
|
|
|
#ifdef MREDEBUG
|
|
_printf("\r%6d", portalnum);
|
|
#endif
|
|
|
|
p = sorted_portals[portalnum];
|
|
|
|
if (p->removed)
|
|
{
|
|
p->status = stat_done;
|
|
return;
|
|
}
|
|
|
|
p->status = stat_working;
|
|
|
|
c_might = CountBits (p->portalflood, numportals*2);
|
|
|
|
memset (&data, 0, sizeof(data));
|
|
data.base = p;
|
|
|
|
data.pstack_head.portal = p;
|
|
data.pstack_head.source = p->winding;
|
|
data.pstack_head.portalplane = p->plane;
|
|
data.pstack_head.depth = 0;
|
|
for (i=0 ; i<portallongs ; i++)
|
|
((long *)data.pstack_head.mightsee)[i] = ((long *)p->portalflood)[i];
|
|
|
|
RecursiveLeafFlow (p->leaf, &data, &data.pstack_head);
|
|
|
|
p->status = stat_done;
|
|
|
|
c_can = CountBits (p->portalvis, numportals*2);
|
|
|
|
qprintf ("portal:%4i mightsee:%4i cansee:%4i (%i chains)\n",
|
|
(int)(p - portals), c_might, c_can, data.c_chains);
|
|
}
|
|
|
|
/*
|
|
==================
|
|
RecursivePassageFlow
|
|
==================
|
|
*/
|
|
void RecursivePassageFlow (vportal_t *portal, threaddata_t *thread, pstack_t *prevstack)
|
|
{
|
|
pstack_t stack;
|
|
vportal_t *p;
|
|
leaf_t *leaf;
|
|
passage_t *passage, *nextpassage;
|
|
int i, j;
|
|
long *might, *vis, *prevmight, *cansee, *portalvis, more;
|
|
int pnum;
|
|
|
|
leaf = &leafs[portal->leaf];
|
|
|
|
prevstack->next = &stack;
|
|
|
|
stack.next = NULL;
|
|
stack.depth = prevstack->depth + 1;
|
|
|
|
vis = (long *)thread->base->portalvis;
|
|
|
|
passage = portal->passages;
|
|
nextpassage = passage;
|
|
// check all portals for flowing into other leafs
|
|
for (i = 0; i < leaf->numportals; i++, passage = nextpassage)
|
|
{
|
|
p = leaf->portals[i];
|
|
if ( p->removed ) {
|
|
continue;
|
|
}
|
|
nextpassage = passage->next;
|
|
pnum = p - portals;
|
|
|
|
if ( ! (prevstack->mightsee[pnum >> 3] & (1<<(pnum&7)) ) ) {
|
|
continue; // can't possibly see it
|
|
}
|
|
|
|
// mark the portal as visible
|
|
thread->base->portalvis[pnum>>3] |= (1<<(pnum&7));
|
|
|
|
prevmight = (long *)prevstack->mightsee;
|
|
cansee = (long *)passage->cansee;
|
|
might = (long *)stack.mightsee;
|
|
memcpy(might, prevmight, portalbytes);
|
|
if (p->status == stat_done)
|
|
portalvis = (long *) p->portalvis;
|
|
else
|
|
portalvis = (long *) p->portalflood;
|
|
more = 0;
|
|
for (j = 0; j < portallongs; j++)
|
|
{
|
|
if (*might)
|
|
{
|
|
*might &= *cansee++ & *portalvis++;
|
|
more |= (*might & ~vis[j]);
|
|
}
|
|
else
|
|
{
|
|
cansee++;
|
|
portalvis++;
|
|
}
|
|
might++;
|
|
}
|
|
|
|
if ( !more ) {
|
|
// can't see anything new
|
|
continue;
|
|
}
|
|
|
|
// flow through it for real
|
|
RecursivePassageFlow(p, thread, &stack);
|
|
|
|
stack.next = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
===============
|
|
PassageFlow
|
|
===============
|
|
*/
|
|
void PassageFlow (int portalnum)
|
|
{
|
|
threaddata_t data;
|
|
int i;
|
|
vportal_t *p;
|
|
// int c_might, c_can;
|
|
|
|
#ifdef MREDEBUG
|
|
_printf("\r%6d", portalnum);
|
|
#endif
|
|
|
|
p = sorted_portals[portalnum];
|
|
|
|
if (p->removed)
|
|
{
|
|
p->status = stat_done;
|
|
return;
|
|
}
|
|
|
|
p->status = stat_working;
|
|
|
|
// c_might = CountBits (p->portalflood, numportals*2);
|
|
|
|
memset (&data, 0, sizeof(data));
|
|
data.base = p;
|
|
|
|
data.pstack_head.portal = p;
|
|
data.pstack_head.source = p->winding;
|
|
data.pstack_head.portalplane = p->plane;
|
|
data.pstack_head.depth = 0;
|
|
for (i=0 ; i<portallongs ; i++)
|
|
((long *)data.pstack_head.mightsee)[i] = ((long *)p->portalflood)[i];
|
|
|
|
RecursivePassageFlow (p, &data, &data.pstack_head);
|
|
|
|
p->status = stat_done;
|
|
|
|
/*
|
|
c_can = CountBits (p->portalvis, numportals*2);
|
|
|
|
qprintf ("portal:%4i mightsee:%4i cansee:%4i (%i chains)\n",
|
|
(int)(p - portals), c_might, c_can, data.c_chains);
|
|
*/
|
|
}
|
|
|
|
/*
|
|
==================
|
|
RecursivePassagePortalFlow
|
|
==================
|
|
*/
|
|
void RecursivePassagePortalFlow (vportal_t *portal, threaddata_t *thread, pstack_t *prevstack)
|
|
{
|
|
pstack_t stack;
|
|
vportal_t *p;
|
|
leaf_t *leaf;
|
|
plane_t backplane;
|
|
passage_t *passage, *nextpassage;
|
|
int i, j, n;
|
|
long *might, *vis, *prevmight, *cansee, *portalvis, more;
|
|
int pnum;
|
|
|
|
// thread->c_chains++;
|
|
|
|
leaf = &leafs[portal->leaf];
|
|
// CheckStack (leaf, thread);
|
|
|
|
prevstack->next = &stack;
|
|
|
|
stack.next = NULL;
|
|
stack.leaf = leaf;
|
|
stack.portal = NULL;
|
|
stack.depth = prevstack->depth + 1;
|
|
|
|
#ifdef SEPERATORCACHE
|
|
stack.numseperators[0] = 0;
|
|
stack.numseperators[1] = 0;
|
|
#endif
|
|
|
|
vis = (long *)thread->base->portalvis;
|
|
|
|
passage = portal->passages;
|
|
nextpassage = passage;
|
|
// check all portals for flowing into other leafs
|
|
for (i = 0; i < leaf->numportals; i++, passage = nextpassage)
|
|
{
|
|
p = leaf->portals[i];
|
|
if (p->removed)
|
|
continue;
|
|
nextpassage = passage->next;
|
|
pnum = p - portals;
|
|
|
|
if ( ! (prevstack->mightsee[pnum >> 3] & (1<<(pnum&7)) ) )
|
|
continue; // can't possibly see it
|
|
|
|
prevmight = (long *)prevstack->mightsee;
|
|
cansee = (long *)passage->cansee;
|
|
might = (long *)stack.mightsee;
|
|
memcpy(might, prevmight, portalbytes);
|
|
if (p->status == stat_done)
|
|
portalvis = (long *) p->portalvis;
|
|
else
|
|
portalvis = (long *) p->portalflood;
|
|
more = 0;
|
|
for (j = 0; j < portallongs; j++)
|
|
{
|
|
if (*might)
|
|
{
|
|
*might &= *cansee++ & *portalvis++;
|
|
more |= (*might & ~vis[j]);
|
|
}
|
|
else
|
|
{
|
|
cansee++;
|
|
portalvis++;
|
|
}
|
|
might++;
|
|
}
|
|
|
|
if (!more && (thread->base->portalvis[pnum>>3] & (1<<(pnum&7))) )
|
|
{ // can't see anything new
|
|
continue;
|
|
}
|
|
|
|
// get plane of portal, point normal into the neighbor leaf
|
|
stack.portalplane = p->plane;
|
|
VectorSubtract (vec3_origin, p->plane.normal, backplane.normal);
|
|
backplane.dist = -p->plane.dist;
|
|
|
|
// c_portalcheck++;
|
|
|
|
stack.portal = p;
|
|
stack.next = NULL;
|
|
stack.freewindings[0] = 1;
|
|
stack.freewindings[1] = 1;
|
|
stack.freewindings[2] = 1;
|
|
|
|
#if 1
|
|
{
|
|
float d;
|
|
|
|
d = DotProduct (p->origin, thread->pstack_head.portalplane.normal);
|
|
d -= thread->pstack_head.portalplane.dist;
|
|
if (d < -p->radius)
|
|
{
|
|
continue;
|
|
}
|
|
else if (d > p->radius)
|
|
{
|
|
stack.pass = p->winding;
|
|
}
|
|
else
|
|
{
|
|
stack.pass = VisChopWinding (p->winding, &stack, &thread->pstack_head.portalplane);
|
|
if (!stack.pass)
|
|
continue;
|
|
}
|
|
}
|
|
#else
|
|
stack.pass = VisChopWinding (p->winding, &stack, &thread->pstack_head.portalplane);
|
|
if (!stack.pass)
|
|
continue;
|
|
#endif
|
|
|
|
|
|
#if 1
|
|
{
|
|
float d;
|
|
|
|
d = DotProduct (thread->base->origin, p->plane.normal);
|
|
d -= p->plane.dist;
|
|
//MrE: vis-bug fix
|
|
//if (d > p->radius)
|
|
if (d > thread->base->radius)
|
|
{
|
|
continue;
|
|
}
|
|
//MrE: vis-bug fix
|
|
//if (d < -p->radius)
|
|
else if (d < -thread->base->radius)
|
|
{
|
|
stack.source = prevstack->source;
|
|
}
|
|
else
|
|
{
|
|
stack.source = VisChopWinding (prevstack->source, &stack, &backplane);
|
|
//FIXME: shouldn't we create a new source origin and radius for fast checks?
|
|
if (!stack.source)
|
|
continue;
|
|
}
|
|
}
|
|
#else
|
|
stack.source = VisChopWinding (prevstack->source, &stack, &backplane);
|
|
if (!stack.source)
|
|
continue;
|
|
#endif
|
|
|
|
if (!prevstack->pass)
|
|
{ // the second leaf can only be blocked if coplanar
|
|
|
|
// mark the portal as visible
|
|
thread->base->portalvis[pnum>>3] |= (1<<(pnum&7));
|
|
|
|
RecursivePassagePortalFlow (p, thread, &stack);
|
|
continue;
|
|
}
|
|
|
|
#ifdef SEPERATORCACHE
|
|
if (stack.numseperators[0])
|
|
{
|
|
for (n = 0; n < stack.numseperators[0]; n++)
|
|
{
|
|
stack.pass = VisChopWinding (stack.pass, &stack, &stack.seperators[0][n]);
|
|
if (!stack.pass)
|
|
break; // target is not visible
|
|
}
|
|
if (n < stack.numseperators[0])
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
stack.pass = ClipToSeperators (prevstack->source, prevstack->pass, stack.pass, qfalse, &stack);
|
|
}
|
|
#else
|
|
stack.pass = ClipToSeperators (stack.source, prevstack->pass, stack.pass, qfalse, &stack);
|
|
#endif
|
|
if (!stack.pass)
|
|
continue;
|
|
|
|
#ifdef SEPERATORCACHE
|
|
if (stack.numseperators[1])
|
|
{
|
|
for (n = 0; n < stack.numseperators[1]; n++)
|
|
{
|
|
stack.pass = VisChopWinding (stack.pass, &stack, &stack.seperators[1][n]);
|
|
if (!stack.pass)
|
|
break; // target is not visible
|
|
}
|
|
}
|
|
else
|
|
{
|
|
stack.pass = ClipToSeperators (prevstack->pass, prevstack->source, stack.pass, qtrue, &stack);
|
|
}
|
|
#else
|
|
stack.pass = ClipToSeperators (prevstack->pass, stack.source, stack.pass, qtrue, &stack);
|
|
#endif
|
|
if (!stack.pass)
|
|
continue;
|
|
|
|
// mark the portal as visible
|
|
thread->base->portalvis[pnum>>3] |= (1<<(pnum&7));
|
|
|
|
// flow through it for real
|
|
RecursivePassagePortalFlow(p, thread, &stack);
|
|
//
|
|
stack.next = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
===============
|
|
PassagePortalFlow
|
|
===============
|
|
*/
|
|
void PassagePortalFlow (int portalnum)
|
|
{
|
|
threaddata_t data;
|
|
int i;
|
|
vportal_t *p;
|
|
// int c_might, c_can;
|
|
|
|
#ifdef MREDEBUG
|
|
_printf("\r%6d", portalnum);
|
|
#endif
|
|
|
|
p = sorted_portals[portalnum];
|
|
|
|
if (p->removed)
|
|
{
|
|
p->status = stat_done;
|
|
return;
|
|
}
|
|
|
|
p->status = stat_working;
|
|
|
|
// c_might = CountBits (p->portalflood, numportals*2);
|
|
|
|
memset (&data, 0, sizeof(data));
|
|
data.base = p;
|
|
|
|
data.pstack_head.portal = p;
|
|
data.pstack_head.source = p->winding;
|
|
data.pstack_head.portalplane = p->plane;
|
|
data.pstack_head.depth = 0;
|
|
for (i=0 ; i<portallongs ; i++)
|
|
((long *)data.pstack_head.mightsee)[i] = ((long *)p->portalflood)[i];
|
|
|
|
RecursivePassagePortalFlow (p, &data, &data.pstack_head);
|
|
|
|
p->status = stat_done;
|
|
|
|
/*
|
|
c_can = CountBits (p->portalvis, numportals*2);
|
|
|
|
qprintf ("portal:%4i mightsee:%4i cansee:%4i (%i chains)\n",
|
|
(int)(p - portals), c_might, c_can, data.c_chains);
|
|
*/
|
|
}
|
|
|
|
winding_t *PassageChopWinding (winding_t *in, winding_t *out, plane_t *split)
|
|
{
|
|
vec_t dists[128];
|
|
int sides[128];
|
|
int counts[3];
|
|
vec_t dot;
|
|
int i, j;
|
|
vec_t *p1, *p2;
|
|
vec3_t mid;
|
|
winding_t *neww;
|
|
|
|
counts[0] = counts[1] = counts[2] = 0;
|
|
|
|
// determine sides for each point
|
|
for (i=0 ; i<in->numpoints ; i++)
|
|
{
|
|
dot = DotProduct (in->points[i], split->normal);
|
|
dot -= split->dist;
|
|
dists[i] = dot;
|
|
if (dot > ON_EPSILON)
|
|
sides[i] = SIDE_FRONT;
|
|
else if (dot < -ON_EPSILON)
|
|
sides[i] = SIDE_BACK;
|
|
else
|
|
{
|
|
sides[i] = SIDE_ON;
|
|
}
|
|
counts[sides[i]]++;
|
|
}
|
|
|
|
if (!counts[1])
|
|
return in; // completely on front side
|
|
|
|
if (!counts[0])
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
sides[i] = sides[0];
|
|
dists[i] = dists[0];
|
|
|
|
neww = out;
|
|
|
|
neww->numpoints = 0;
|
|
|
|
for (i=0 ; i<in->numpoints ; i++)
|
|
{
|
|
p1 = in->points[i];
|
|
|
|
if (neww->numpoints == MAX_POINTS_ON_FIXED_WINDING)
|
|
{
|
|
return in; // can't chop -- fall back to original
|
|
}
|
|
|
|
if (sides[i] == SIDE_ON)
|
|
{
|
|
VectorCopy (p1, neww->points[neww->numpoints]);
|
|
neww->numpoints++;
|
|
continue;
|
|
}
|
|
|
|
if (sides[i] == SIDE_FRONT)
|
|
{
|
|
VectorCopy (p1, neww->points[neww->numpoints]);
|
|
neww->numpoints++;
|
|
}
|
|
|
|
if (sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
|
|
continue;
|
|
|
|
if (neww->numpoints == MAX_POINTS_ON_FIXED_WINDING)
|
|
{
|
|
return in; // can't chop -- fall back to original
|
|
}
|
|
|
|
// generate a split point
|
|
p2 = in->points[(i+1)%in->numpoints];
|
|
|
|
dot = dists[i] / (dists[i]-dists[i+1]);
|
|
for (j=0 ; j<3 ; j++)
|
|
{ // avoid round off error when possible
|
|
if (split->normal[j] == 1)
|
|
mid[j] = split->dist;
|
|
else if (split->normal[j] == -1)
|
|
mid[j] = -split->dist;
|
|
else
|
|
mid[j] = p1[j] + dot*(p2[j]-p1[j]);
|
|
}
|
|
|
|
VectorCopy (mid, neww->points[neww->numpoints]);
|
|
neww->numpoints++;
|
|
}
|
|
|
|
return neww;
|
|
}
|
|
|
|
/*
|
|
===============
|
|
AddSeperators
|
|
===============
|
|
*/
|
|
int AddSeperators (winding_t *source, winding_t *pass, qboolean flipclip, plane_t *seperators, int maxseperators)
|
|
{
|
|
int i, j, k, l;
|
|
plane_t plane;
|
|
vec3_t v1, v2;
|
|
float d;
|
|
vec_t length;
|
|
int counts[3], numseperators;
|
|
qboolean fliptest;
|
|
|
|
numseperators = 0;
|
|
// check all combinations
|
|
for (i=0 ; i<source->numpoints ; i++)
|
|
{
|
|
l = (i+1)%source->numpoints;
|
|
VectorSubtract (source->points[l] , source->points[i], v1);
|
|
|
|
// find a vertex of pass that makes a plane that puts all of the
|
|
// vertexes of pass on the front side and all of the vertexes of
|
|
// source on the back side
|
|
for (j=0 ; j<pass->numpoints ; j++)
|
|
{
|
|
VectorSubtract (pass->points[j], source->points[i], v2);
|
|
|
|
plane.normal[0] = v1[1]*v2[2] - v1[2]*v2[1];
|
|
plane.normal[1] = v1[2]*v2[0] - v1[0]*v2[2];
|
|
plane.normal[2] = v1[0]*v2[1] - v1[1]*v2[0];
|
|
|
|
// if points don't make a valid plane, skip it
|
|
|
|
length = plane.normal[0] * plane.normal[0]
|
|
+ plane.normal[1] * plane.normal[1]
|
|
+ plane.normal[2] * plane.normal[2];
|
|
|
|
if (length < ON_EPSILON)
|
|
continue;
|
|
|
|
length = 1/sqrt(length);
|
|
|
|
plane.normal[0] *= length;
|
|
plane.normal[1] *= length;
|
|
plane.normal[2] *= length;
|
|
|
|
plane.dist = DotProduct (pass->points[j], plane.normal);
|
|
|
|
//
|
|
// find out which side of the generated seperating plane has the
|
|
// source portal
|
|
//
|
|
#if 1
|
|
fliptest = qfalse;
|
|
for (k=0 ; k<source->numpoints ; k++)
|
|
{
|
|
if (k == i || k == l)
|
|
continue;
|
|
d = DotProduct (source->points[k], plane.normal) - plane.dist;
|
|
if (d < -ON_EPSILON)
|
|
{ // source is on the negative side, so we want all
|
|
// pass and target on the positive side
|
|
fliptest = qfalse;
|
|
break;
|
|
}
|
|
else if (d > ON_EPSILON)
|
|
{ // source is on the positive side, so we want all
|
|
// pass and target on the negative side
|
|
fliptest = qtrue;
|
|
break;
|
|
}
|
|
}
|
|
if (k == source->numpoints)
|
|
continue; // planar with source portal
|
|
#else
|
|
fliptest = flipclip;
|
|
#endif
|
|
//
|
|
// flip the normal if the source portal is backwards
|
|
//
|
|
if (fliptest)
|
|
{
|
|
VectorSubtract (vec3_origin, plane.normal, plane.normal);
|
|
plane.dist = -plane.dist;
|
|
}
|
|
#if 1
|
|
//
|
|
// if all of the pass portal points are now on the positive side,
|
|
// this is the seperating plane
|
|
//
|
|
counts[0] = counts[1] = counts[2] = 0;
|
|
for (k=0 ; k<pass->numpoints ; k++)
|
|
{
|
|
if (k==j)
|
|
continue;
|
|
d = DotProduct (pass->points[k], plane.normal) - plane.dist;
|
|
if (d < -ON_EPSILON)
|
|
break;
|
|
else if (d > ON_EPSILON)
|
|
counts[0]++;
|
|
else
|
|
counts[2]++;
|
|
}
|
|
if (k != pass->numpoints)
|
|
continue; // points on negative side, not a seperating plane
|
|
|
|
if (!counts[0])
|
|
continue; // planar with seperating plane
|
|
#else
|
|
k = (j+1)%pass->numpoints;
|
|
d = DotProduct (pass->points[k], plane.normal) - plane.dist;
|
|
if (d < -ON_EPSILON)
|
|
continue;
|
|
k = (j+pass->numpoints-1)%pass->numpoints;
|
|
d = DotProduct (pass->points[k], plane.normal) - plane.dist;
|
|
if (d < -ON_EPSILON)
|
|
continue;
|
|
#endif
|
|
//
|
|
// flip the normal if we want the back side
|
|
//
|
|
if (flipclip)
|
|
{
|
|
VectorSubtract (vec3_origin, plane.normal, plane.normal);
|
|
plane.dist = -plane.dist;
|
|
}
|
|
|
|
if (numseperators >= maxseperators)
|
|
Error("max seperators");
|
|
seperators[numseperators] = plane;
|
|
numseperators++;
|
|
break;
|
|
}
|
|
}
|
|
return numseperators;
|
|
}
|
|
|
|
/*
|
|
===============
|
|
CreatePassages
|
|
|
|
MrE: create passages from one portal to all the portals in the leaf the portal leads to
|
|
every passage has a cansee bit string with all the portals that can be
|
|
seen through the passage
|
|
===============
|
|
*/
|
|
void CreatePassages(int portalnum)
|
|
{
|
|
int i, j, k, n, numseperators, numsee;
|
|
float d;
|
|
vportal_t *portal, *p, *target;
|
|
leaf_t *leaf;
|
|
passage_t *passage, *lastpassage;
|
|
plane_t seperators[MAX_SEPERATORS*2];
|
|
winding_t *w;
|
|
winding_t in, out, *res;
|
|
|
|
#ifdef MREDEBUG
|
|
_printf("\r%6d", portalnum);
|
|
#endif
|
|
|
|
portal = sorted_portals[portalnum];
|
|
|
|
if (portal->removed)
|
|
{
|
|
portal->status = stat_done;
|
|
return;
|
|
}
|
|
|
|
lastpassage = NULL;
|
|
leaf = &leafs[portal->leaf];
|
|
for (i = 0; i < leaf->numportals; i++)
|
|
{
|
|
target = leaf->portals[i];
|
|
if (target->removed)
|
|
continue;
|
|
|
|
passage = (passage_t *) malloc(sizeof(passage_t) + portalbytes);
|
|
memset(passage, 0, sizeof(passage_t) + portalbytes);
|
|
numseperators = AddSeperators(portal->winding, target->winding, qfalse, seperators, MAX_SEPERATORS*2);
|
|
numseperators += AddSeperators(target->winding, portal->winding, qtrue, &seperators[numseperators], MAX_SEPERATORS*2-numseperators);
|
|
|
|
passage->next = NULL;
|
|
if (lastpassage)
|
|
lastpassage->next = passage;
|
|
else
|
|
portal->passages = passage;
|
|
lastpassage = passage;
|
|
|
|
numsee = 0;
|
|
//create the passage->cansee
|
|
for (j = 0; j < numportals * 2; j++)
|
|
{
|
|
p = &portals[j];
|
|
if (p->removed)
|
|
continue;
|
|
if ( ! (target->portalflood[j >> 3] & (1<<(j&7)) ) )
|
|
continue;
|
|
if ( ! (portal->portalflood[j >> 3] & (1<<(j&7)) ) )
|
|
continue;
|
|
for (k = 0; k < numseperators; k++)
|
|
{
|
|
//
|
|
d = DotProduct (p->origin, seperators[k].normal) - seperators[k].dist;
|
|
//if completely at the back of the seperator plane
|
|
if (d < -p->radius + ON_EPSILON)
|
|
break;
|
|
w = p->winding;
|
|
for (n = 0; n < w->numpoints; n++)
|
|
{
|
|
d = DotProduct (w->points[n], seperators[k].normal) - seperators[k].dist;
|
|
//if at the front of the seperator
|
|
if (d > ON_EPSILON)
|
|
break;
|
|
}
|
|
//if no points are at the front of the seperator
|
|
if (n >= w->numpoints)
|
|
break;
|
|
}
|
|
if (k < numseperators)
|
|
continue;
|
|
memcpy(&in, p->winding, sizeof(winding_t));
|
|
for (k = 0; k < numseperators; k++)
|
|
{
|
|
res = PassageChopWinding(&in, &out, &seperators[k]);
|
|
if (res == &out)
|
|
memcpy(&in, &out, sizeof(winding_t));
|
|
if (res == NULL)
|
|
break;
|
|
}
|
|
if (k < numseperators)
|
|
continue;
|
|
passage->cansee[j >> 3] |= (1<<(j&7));
|
|
numsee++;
|
|
}
|
|
}
|
|
}
|
|
|
|
void PassageMemory(void)
|
|
{
|
|
int i, j, totalmem, totalportals;
|
|
vportal_t *portal, *target;
|
|
leaf_t *leaf;
|
|
|
|
totalmem = 0;
|
|
totalportals = 0;
|
|
for (i = 0; i < numportals; i++)
|
|
{
|
|
portal = sorted_portals[i];
|
|
if (portal->removed)
|
|
continue;
|
|
leaf = &leafs[portal->leaf];
|
|
for (j = 0; j < leaf->numportals; j++)
|
|
{
|
|
target = leaf->portals[j];
|
|
if (target->removed)
|
|
continue;
|
|
totalmem += sizeof(passage_t) + portalbytes;
|
|
totalportals++;
|
|
}
|
|
}
|
|
_printf("%7i average number of passages per leaf\n", totalportals / numportals);
|
|
_printf("%7i MB required passage memory\n", totalmem >> 10 >> 10);
|
|
}
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
This is a rough first-order aproximation that is used to trivially reject some
|
|
of the final calculations.
|
|
|
|
|
|
Calculates portalfront and portalflood bit vectors
|
|
|
|
thinking about:
|
|
|
|
typedef struct passage_s
|
|
{
|
|
struct passage_s *next;
|
|
struct portal_s *to;
|
|
stryct sep_s *seperators;
|
|
byte *mightsee;
|
|
} passage_t;
|
|
|
|
typedef struct portal_s
|
|
{
|
|
struct passage_s *passages;
|
|
int leaf; // leaf portal faces into
|
|
} portal_s;
|
|
|
|
leaf = portal->leaf
|
|
clear
|
|
for all portals
|
|
|
|
|
|
calc portal visibility
|
|
clear bit vector
|
|
for all passages
|
|
passage visibility
|
|
|
|
|
|
for a portal to be visible to a passage, it must be on the front of
|
|
all seperating planes, and both portals must be behind the new portal
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
int c_flood, c_vis;
|
|
|
|
|
|
/*
|
|
==================
|
|
SimpleFlood
|
|
|
|
==================
|
|
*/
|
|
void SimpleFlood (vportal_t *srcportal, int leafnum)
|
|
{
|
|
int i;
|
|
leaf_t *leaf;
|
|
vportal_t *p;
|
|
int pnum;
|
|
|
|
leaf = &leafs[leafnum];
|
|
|
|
for (i=0 ; i<leaf->numportals ; i++)
|
|
{
|
|
p = leaf->portals[i];
|
|
if (p->removed)
|
|
continue;
|
|
pnum = p - portals;
|
|
if ( ! (srcportal->portalfront[pnum>>3] & (1<<(pnum&7)) ) )
|
|
continue;
|
|
|
|
if (srcportal->portalflood[pnum>>3] & (1<<(pnum&7)) )
|
|
continue;
|
|
|
|
srcportal->portalflood[pnum>>3] |= (1<<(pnum&7));
|
|
|
|
SimpleFlood (srcportal, p->leaf);
|
|
}
|
|
}
|
|
|
|
/*
|
|
==============
|
|
BasePortalVis
|
|
==============
|
|
*/
|
|
void BasePortalVis (int portalnum)
|
|
{
|
|
int j, k;
|
|
vportal_t *tp, *p;
|
|
float d;
|
|
winding_t *w;
|
|
|
|
p = portals+portalnum;
|
|
|
|
if (p->removed)
|
|
return;
|
|
|
|
p->portalfront = malloc (portalbytes);
|
|
memset (p->portalfront, 0, portalbytes);
|
|
|
|
p->portalflood = malloc (portalbytes);
|
|
memset (p->portalflood, 0, portalbytes);
|
|
|
|
p->portalvis = malloc (portalbytes);
|
|
memset (p->portalvis, 0, portalbytes);
|
|
|
|
for (j=0, tp = portals ; j<numportals*2 ; j++, tp++)
|
|
{
|
|
if (j == portalnum)
|
|
continue;
|
|
if (tp->removed)
|
|
continue;
|
|
/*
|
|
if (farplanedist >= 0)
|
|
{
|
|
vec3_t dir;
|
|
VectorSubtract(p->origin, tp->origin, dir);
|
|
if (VectorLength(dir) > farplanedist - p->radius - tp->radius)
|
|
continue;
|
|
}
|
|
*/
|
|
w = tp->winding;
|
|
for (k=0 ; k<w->numpoints ; k++)
|
|
{
|
|
d = DotProduct (w->points[k], p->plane.normal)
|
|
- p->plane.dist;
|
|
if (d > ON_EPSILON)
|
|
break;
|
|
}
|
|
if (k == w->numpoints)
|
|
continue; // no points on front
|
|
|
|
w = p->winding;
|
|
for (k=0 ; k<w->numpoints ; k++)
|
|
{
|
|
d = DotProduct (w->points[k], tp->plane.normal)
|
|
- tp->plane.dist;
|
|
if (d < -ON_EPSILON)
|
|
break;
|
|
}
|
|
if (k == w->numpoints)
|
|
continue; // no points on front
|
|
|
|
p->portalfront[j>>3] |= (1<<(j&7));
|
|
}
|
|
|
|
SimpleFlood (p, p->leaf);
|
|
|
|
p->nummightsee = CountBits (p->portalflood, numportals*2);
|
|
// _printf ("portal %i: %i mightsee\n", portalnum, p->nummightsee);
|
|
c_flood += p->nummightsee;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
This is a second order aproximation
|
|
|
|
Calculates portalvis bit vector
|
|
|
|
WAAAAAAY too slow.
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
/*
|
|
==================
|
|
RecursiveLeafBitFlow
|
|
|
|
==================
|
|
*/
|
|
void RecursiveLeafBitFlow (int leafnum, byte *mightsee, byte *cansee)
|
|
{
|
|
vportal_t *p;
|
|
leaf_t *leaf;
|
|
int i, j;
|
|
long more;
|
|
int pnum;
|
|
byte newmight[MAX_PORTALS/8];
|
|
|
|
leaf = &leafs[leafnum];
|
|
|
|
// check all portals for flowing into other leafs
|
|
for (i=0 ; i<leaf->numportals ; i++)
|
|
{
|
|
p = leaf->portals[i];
|
|
if (p->removed)
|
|
continue;
|
|
pnum = p - portals;
|
|
|
|
// if some previous portal can't see it, skip
|
|
if (! (mightsee[pnum>>3] & (1<<(pnum&7)) ) )
|
|
continue;
|
|
|
|
// if this portal can see some portals we mightsee, recurse
|
|
more = 0;
|
|
for (j=0 ; j<portallongs ; j++)
|
|
{
|
|
((long *)newmight)[j] = ((long *)mightsee)[j]
|
|
& ((long *)p->portalflood)[j];
|
|
more |= ((long *)newmight)[j] & ~((long *)cansee)[j];
|
|
}
|
|
|
|
if (!more)
|
|
continue; // can't see anything new
|
|
|
|
cansee[pnum>>3] |= (1<<(pnum&7));
|
|
|
|
RecursiveLeafBitFlow (p->leaf, newmight, cansee);
|
|
}
|
|
}
|
|
|
|
/*
|
|
==============
|
|
BetterPortalVis
|
|
==============
|
|
*/
|
|
void BetterPortalVis (int portalnum)
|
|
{
|
|
vportal_t *p;
|
|
|
|
p = portals+portalnum;
|
|
|
|
if (p->removed)
|
|
return;
|
|
|
|
RecursiveLeafBitFlow (p->leaf, p->portalflood, p->portalvis);
|
|
|
|
// build leaf vis information
|
|
p->nummightsee = CountBits (p->portalvis, numportals*2);
|
|
c_vis += p->nummightsee;
|
|
}
|
|
|
|
|