882 lines
18 KiB
C++
882 lines
18 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#include "vis.h"
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#include "vmpi.h"
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int g_TraceClusterStart = -1;
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int g_TraceClusterStop = -1;
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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 ( CheckBit( bits, i ) )
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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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extern bool g_bVMPIEarlyExit;
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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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// Msg ("=");
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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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// Msg ("\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 ("Out of memory. 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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ChopWinding
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==============
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*/
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#ifdef _WIN32
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#pragma warning (disable:4701)
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#endif
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winding_t *ChopWinding (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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Vector 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_VIS_EPSILON)
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sides[i] = SIDE_FRONT;
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else if (dot < -ON_VIS_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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Vector& 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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Vector& 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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#ifdef _WIN32
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#pragma warning (default:4701)
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#endif
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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, bool 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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Vector 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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bool 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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// fing 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_VIS_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 = false;
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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_VIS_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 = false;
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break;
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}
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else if (d > ON_VIS_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 = true;
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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_VIS_EPSILON)
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break;
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else if (d > ON_VIS_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_VIS_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_VIS_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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//
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// clip target by the seperating plane
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//
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target = ChopWinding (target, stack, &plane);
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if (!target)
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return NULL; // target is not visible
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// JAY: End the loop, no need to find additional separators on this edge ?
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// j = pass->numpoints;
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}
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}
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return target;
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}
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class CPortalTrace
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{
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public:
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CUtlVector<Vector> m_list;
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CThreadFastMutex m_mutex;
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} g_PortalTrace;
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void WindingCenter (winding_t *w, Vector ¢er)
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{
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int i;
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float scale;
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VectorCopy (vec3_origin, center);
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for (i=0 ; i<w->numpoints ; i++)
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VectorAdd (w->points[i], center, center);
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scale = 1.0/w->numpoints;
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VectorScale (center, scale, center);
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}
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Vector ClusterCenter( int cluster )
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{
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Vector mins, maxs;
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ClearBounds(mins, maxs);
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int count = leafs[cluster].portals.Count();
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for ( int i = 0; i < count; i++ )
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{
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winding_t *w = leafs[cluster].portals[i]->winding;
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for ( int j = 0; j < w->numpoints; j++ )
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{
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AddPointToBounds( w->points[j], mins, maxs );
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}
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}
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return (mins + maxs) * 0.5f;
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}
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void DumpPortalTrace( pstack_t *pStack )
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{
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AUTO_LOCK(g_PortalTrace.m_mutex);
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if ( g_PortalTrace.m_list.Count() )
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return;
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Warning("Dumped cluster trace!!!\n");
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Vector mid;
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mid = ClusterCenter( g_TraceClusterStart );
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g_PortalTrace.m_list.AddToTail(mid);
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for ( ; pStack != NULL; pStack = pStack->next )
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{
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winding_t *w = pStack->pass ? pStack->pass : pStack->portal->winding;
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WindingCenter (w, mid);
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g_PortalTrace.m_list.AddToTail(mid);
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for ( int i = 0; i < w->numpoints; i++ )
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{
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g_PortalTrace.m_list.AddToTail(w->points[i]);
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g_PortalTrace.m_list.AddToTail(mid);
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}
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for ( int i = 0; i < w->numpoints; i++ )
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{
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g_PortalTrace.m_list.AddToTail(w->points[i]);
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}
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g_PortalTrace.m_list.AddToTail(w->points[0]);
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g_PortalTrace.m_list.AddToTail(mid);
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}
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mid = ClusterCenter( g_TraceClusterStop );
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g_PortalTrace.m_list.AddToTail(mid);
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}
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void WritePortalTrace( const char *source )
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{
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Vector mid;
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FILE *linefile;
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char filename[1024];
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if ( !g_PortalTrace.m_list.Count() )
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{
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Warning("No trace generated from %d to %d\n", g_TraceClusterStart, g_TraceClusterStop );
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return;
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}
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sprintf (filename, "%s.lin", source);
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linefile = fopen (filename, "w");
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if (!linefile)
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Error ("Couldn't open %s\n", filename);
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for ( int i = 0; i < g_PortalTrace.m_list.Count(); i++ )
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{
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Vector p = g_PortalTrace.m_list[i];
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fprintf (linefile, "%f %f %f\n", p[0], p[1], p[2]);
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}
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fclose (linefile);
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Warning("Wrote %s!!!\n", filename);
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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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portal_t *p;
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plane_t backplane;
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leaf_t *leaf;
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int i, j;
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long *test, *might, *vis, more;
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int pnum;
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// Early-out if we're a VMPI worker that's told to exit. If we don't do this here, then the
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// worker might spin its wheels for a while on an expensive work unit and not be available to the pool.
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// This is pretty common in vis.
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if ( g_bVMPIEarlyExit )
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return;
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if ( leafnum == g_TraceClusterStop )
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{
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DumpPortalTrace(&thread->pstack_head);
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return;
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}
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thread->c_chains++;
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leaf = &leafs[leafnum];
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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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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->portals.Count() ; i++)
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{
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p = leaf->portals[i];
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pnum = p - portals;
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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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for (j=0 ; j<portallongs ; j++)
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{
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might[j] = ((long *)prevstack->mightsee)[j] & test[j];
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more |= (might[j] & ~vis[j]);
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}
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if ( !more && CheckBit( thread->base->portalvis, pnum ) )
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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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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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float 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)
|
|
{
|
|
continue;
|
|
}
|
|
else if (d > p->radius)
|
|
{
|
|
stack.pass = p->winding;
|
|
}
|
|
else
|
|
{
|
|
stack.pass = ChopWinding (p->winding, &stack, &thread->pstack_head.portalplane);
|
|
if (!stack.pass)
|
|
continue;
|
|
}
|
|
|
|
|
|
d = DotProduct (thread->base->origin, p->plane.normal);
|
|
d -= p->plane.dist;
|
|
if (d > thread->base->radius)
|
|
{
|
|
continue;
|
|
}
|
|
else if (d < -thread->base->radius)
|
|
{
|
|
stack.source = prevstack->source;
|
|
}
|
|
else
|
|
{
|
|
stack.source = ChopWinding (prevstack->source, &stack, &backplane);
|
|
if (!stack.source)
|
|
continue;
|
|
}
|
|
|
|
|
|
if (!prevstack->pass)
|
|
{ // the second leaf can only be blocked if coplanar
|
|
|
|
// mark the portal as visible
|
|
SetBit( thread->base->portalvis, pnum );
|
|
|
|
RecursiveLeafFlow (p->leaf, thread, &stack);
|
|
continue;
|
|
}
|
|
|
|
stack.pass = ClipToSeperators (stack.source, prevstack->pass, stack.pass, false, &stack);
|
|
if (!stack.pass)
|
|
continue;
|
|
|
|
stack.pass = ClipToSeperators (prevstack->pass, stack.source, stack.pass, true, &stack);
|
|
if (!stack.pass)
|
|
continue;
|
|
|
|
// mark the portal as visible
|
|
SetBit( thread->base->portalvis, pnum );
|
|
|
|
// flow through it for real
|
|
RecursiveLeafFlow (p->leaf, thread, &stack);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
===============
|
|
PortalFlow
|
|
|
|
generates the portalvis bit vector
|
|
===============
|
|
*/
|
|
void PortalFlow (int iThread, int portalnum)
|
|
{
|
|
threaddata_t data;
|
|
int i;
|
|
portal_t *p;
|
|
int c_might, c_can;
|
|
|
|
p = sorted_portals[portalnum];
|
|
p->status = stat_working;
|
|
|
|
c_might = CountBits (p->portalflood, g_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;
|
|
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, g_numportals*2);
|
|
|
|
qprintf ("portal:%4i mightsee:%4i cansee:%4i (%i chains)\n",
|
|
(int)(p - portals), c_might, c_can, data.c_chains);
|
|
}
|
|
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
This is a rough first-order aproximation that is used to trivially reject some
|
|
of the final calculations.
|
|
|
|
|
|
Calculates portalfront and portalflood bit vectors
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
int c_flood, c_vis;
|
|
|
|
/*
|
|
==================
|
|
SimpleFlood
|
|
|
|
==================
|
|
*/
|
|
void SimpleFlood (portal_t *srcportal, int leafnum)
|
|
{
|
|
int i;
|
|
leaf_t *leaf;
|
|
portal_t *p;
|
|
int pnum;
|
|
|
|
leaf = &leafs[leafnum];
|
|
|
|
for (i=0 ; i<leaf->portals.Count(); i++)
|
|
{
|
|
p = leaf->portals[i];
|
|
pnum = p - portals;
|
|
if ( !CheckBit( srcportal->portalfront, pnum ) )
|
|
continue;
|
|
|
|
if ( CheckBit( srcportal->portalflood, pnum ) )
|
|
continue;
|
|
|
|
SetBit( srcportal->portalflood, pnum );
|
|
|
|
SimpleFlood (srcportal, p->leaf);
|
|
}
|
|
}
|
|
|
|
/*
|
|
==============
|
|
BasePortalVis
|
|
==============
|
|
*/
|
|
void BasePortalVis (int iThread, int portalnum)
|
|
{
|
|
int j, k;
|
|
portal_t *tp, *p;
|
|
float d;
|
|
winding_t *w;
|
|
Vector segment;
|
|
double dist2, minDist2;
|
|
|
|
// get the portal
|
|
p = portals+portalnum;
|
|
|
|
//
|
|
// allocate memory for bitwise vis solutions for this portal
|
|
//
|
|
p->portalfront = (byte*)malloc (portalbytes);
|
|
memset (p->portalfront, 0, portalbytes);
|
|
|
|
p->portalflood = (byte*)malloc (portalbytes);
|
|
memset (p->portalflood, 0, portalbytes);
|
|
|
|
p->portalvis = (byte*)malloc (portalbytes);
|
|
memset (p->portalvis, 0, portalbytes);
|
|
|
|
//
|
|
// test the given portal against all of the portals in the map
|
|
//
|
|
for (j=0, tp = portals ; j<g_numportals*2 ; j++, tp++)
|
|
{
|
|
// don't test against itself
|
|
if (j == portalnum)
|
|
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_VIS_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_VIS_EPSILON)
|
|
break;
|
|
}
|
|
if (k == w->numpoints)
|
|
continue; // no points on front
|
|
|
|
//
|
|
// if using radius visibility -- check to see if any portal points lie inside of the
|
|
// radius given
|
|
//
|
|
if( g_bUseRadius )
|
|
{
|
|
w = tp->winding;
|
|
minDist2 = 1024000000.0; // 32000^2
|
|
for( k = 0; k < w->numpoints; k++ )
|
|
{
|
|
VectorSubtract( w->points[k], p->origin, segment );
|
|
dist2 = ( segment[0] * segment[0] ) + ( segment[1] * segment[1] ) + ( segment[2] * segment[2] );
|
|
if( dist2 < minDist2 )
|
|
{
|
|
minDist2 = dist2;
|
|
}
|
|
}
|
|
|
|
if( minDist2 > g_VisRadius )
|
|
continue;
|
|
}
|
|
|
|
// add current portal to given portal's list of visible portals
|
|
SetBit( p->portalfront, j );
|
|
}
|
|
|
|
SimpleFlood (p, p->leaf);
|
|
|
|
p->nummightsee = CountBits (p->portalflood, g_numportals*2);
|
|
// Msg ("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)
|
|
{
|
|
portal_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->portals.Count(); i++)
|
|
{
|
|
p = leaf->portals[i];
|
|
pnum = p - portals;
|
|
|
|
// if some previous portal can't see it, skip
|
|
if ( !CheckBit( mightsee, pnum ) )
|
|
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
|
|
|
|
SetBit( cansee, pnum );
|
|
|
|
RecursiveLeafBitFlow (p->leaf, newmight, cansee);
|
|
}
|
|
}
|
|
|
|
/*
|
|
==============
|
|
BetterPortalVis
|
|
==============
|
|
*/
|
|
void BetterPortalVis (int portalnum)
|
|
{
|
|
portal_t *p;
|
|
|
|
p = portals+portalnum;
|
|
|
|
RecursiveLeafBitFlow (p->leaf, p->portalflood, p->portalvis);
|
|
|
|
// build leaf vis information
|
|
p->nummightsee = CountBits (p->portalvis, g_numportals*2);
|
|
c_vis += p->nummightsee;
|
|
}
|
|
|
|
|