505 lines
11 KiB
C
505 lines
11 KiB
C
// vis.c
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#include "bsplib.h"
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int numportals;
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int portalclusters;
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char inbase[32];
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char outbase[32];
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visportal_t *portals;
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leaf_t *leafs;
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int c_portaltest, c_portalpass, c_portalcheck;
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byte *uncompressedvis;
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byte *vismap, *vismap_p, *vismap_end; // past visfile
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int originalvismapsize;
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int leafbytes; // (portalclusters+63)>>3
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int leaflongs;
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int portalbytes, portallongs;
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bool fastvis;
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int testlevel = 2;
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int totalvis;
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int totalphs;
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visportal_t *sorted_portals[MAX_MAP_PORTALS*2];
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//=============================================================================
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void PlaneFromWinding (viswinding_t *w, visplane_t *plane)
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{
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vec3_t v1, v2;
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// calc plane
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VectorSubtract (w->points[2], w->points[1], v1);
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VectorSubtract (w->points[0], w->points[1], v2);
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CrossProduct (v2, v1, plane->normal);
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VectorNormalize (plane->normal);
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plane->dist = DotProduct (w->points[0], plane->normal);
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}
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/*
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==================
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NewVisWinding
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==================
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*/
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viswinding_t *NewVisWinding (int points)
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{
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viswinding_t *w;
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int size;
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if (points > MAX_POINTS_ON_WINDING)
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Sys_Error ("NewVisWinding: %i points", points);
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size = (int)((viswinding_t *)0)->points[points];
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w = Malloc (size);
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return w;
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}
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static void pw(viswinding_t *w)
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{
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int i;
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for (i=0 ; i<w->numpoints ; i++)
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Msg("(%5.1f, %5.1f, %5.1f)\n",w->points[i][0], w->points[i][1],w->points[i][2]);
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}
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static void prl(leaf_t *l)
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{
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int i;
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visportal_t *p;
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visplane_t pl;
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for (i=0 ; i<l->numportals ; i++)
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{
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p = l->portals[i];
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pl = p->plane;
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Msg ("portal %4i to leaf %4i : %7.1f : (%4.1f, %4.1f, %4.1f)\n",(int)(p-portals),p->leaf,pl.dist, pl.normal[0], pl.normal[1], pl.normal[2]);
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}
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}
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//=============================================================================
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/*
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=============
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SortPortals
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Sorts the portals from the least complex, so the later ones can reuse
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the earlier information.
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=============
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*/
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int PComp (const void *a, const void *b)
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{
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if ( (*(visportal_t **)a)->nummightsee == (*(visportal_t **)b)->nummightsee)
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return 0;
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if ( (*(visportal_t **)a)->nummightsee < (*(visportal_t **)b)->nummightsee)
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return -1;
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return 1;
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}
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void SortPortals (void)
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{
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int i;
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for (i=0 ; i<numportals*2 ; i++)
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sorted_portals[i] = &portals[i];
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qsort (sorted_portals, numportals*2, sizeof(sorted_portals[0]), PComp);
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}
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/*
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==============
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LeafVectorFromPortalVector
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==============
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*/
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int LeafVectorFromPortalVector (byte *portalbits, byte *leafbits)
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{
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int i;
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visportal_t *p;
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int c_leafs;
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memset (leafbits, 0, leafbytes);
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for (i=0 ; i<numportals*2 ; i++)
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{
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if (portalbits[i>>3] & (1<<(i&7)) )
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{
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p = portals+i;
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leafbits[p->leaf>>3] |= (1<<(p->leaf&7));
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}
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}
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c_leafs = CountBits (leafbits, portalclusters);
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return c_leafs;
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}
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/*
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===============
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ClusterMerge
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Merges the portal visibility for a leaf
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===============
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*/
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void ClusterMerge (int leafnum)
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{
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leaf_t *leaf;
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byte portalvector[MAX_PORTALS/8];
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byte uncompressed[MAX_MAP_LEAFS/8];
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byte compressed[MAX_MAP_LEAFS/8];
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int i, j;
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int numvis;
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byte *dest;
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visportal_t *p;
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int pnum;
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// OR together all the portalvis bits
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memset (portalvector, 0, portalbytes);
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leaf = &leafs[leafnum];
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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->status != stat_done)
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Sys_Error ("portal not done");
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for(j = 0; j < portallongs; j++)
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((long *)portalvector)[j] |= ((long *)p->portalvis)[j];
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pnum = p - portals;
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portalvector[pnum>>3] |= 1<<(pnum&7);
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}
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// convert portal bits to leaf bits
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numvis = LeafVectorFromPortalVector(portalvector, uncompressed);
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if (uncompressed[leafnum>>3] & (1<<(leafnum&7)))
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MsgDev( D_WARN, "Leaf portals saw into leaf\n");
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uncompressed[leafnum>>3] |= (1<<(leafnum&7));
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numvis++; // count the leaf itself
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// save uncompressed for PHS calculation
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Mem_Copy(uncompressedvis + leafnum*leafbytes, uncompressed, leafbytes);
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// compress the bit string
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totalvis += numvis;
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i = CompressVis (uncompressed, compressed);
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dest = vismap_p;
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vismap_p += i;
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if (vismap_p > vismap_end)
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Sys_Error ("Vismap expansion overflow");
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dvis->bitofs[leafnum][DVIS_PVS] = dest - vismap;
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Mem_Copy(dest, compressed, i);
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}
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/*
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==================
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CalcPortalVis
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==================
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*/
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void CalcPortalVis (void)
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{
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int i;
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// fastvis just uses mightsee for a very loose bound
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if(fastvis)
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{
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for (i = 0; i < numportals * 2; i++)
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{
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portals[i].portalvis = portals[i].portalflood;
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portals[i].status = stat_done;
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}
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return;
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}
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RunThreadsOnIndividual (numportals*2, true, PortalFlow);
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}
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/*
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==================
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CalcVis
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==================
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*/
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void CalcVis (void)
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{
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int i;
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Msg ("Building PVS...\n");
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RunThreadsOnIndividual (numportals*2, true, BasePortalVis);
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SortPortals ();
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CalcPortalVis ();
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//
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// assemble the leaf vis lists by oring and compressing the portal lists
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//
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for (i=0 ; i<portalclusters ; i++)
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ClusterMerge (i);
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Msg ("Average clusters visible: %i\n", totalvis / portalclusters);
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}
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void SetPortalSphere (visportal_t *p)
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{
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int i;
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vec3_t total, dist;
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viswinding_t *w;
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float r, bestr;
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w = p->winding;
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VectorCopy (vec3_origin, total);
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for (i=0 ; i<w->numpoints ; i++)
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{
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VectorAdd (total, w->points[i], total);
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}
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for (i=0 ; i<3 ; i++)
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total[i] /= w->numpoints;
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bestr = 0;
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for (i=0 ; i<w->numpoints ; i++)
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{
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VectorSubtract (w->points[i], total, dist);
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r = VectorLength (dist);
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if (r > bestr)
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bestr = r;
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}
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VectorCopy (total, p->origin);
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p->radius = bestr;
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}
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/*
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============
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LoadPortals
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============
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*/
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void LoadPortals (void)
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{
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int i, j;
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bool load;
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visportal_t *p;
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leaf_t *l;
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char magic[80];
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char path[MAX_SYSPATH];
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int numpoints;
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viswinding_t *w;
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int leafnums[2];
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visplane_t plane;
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sprintf (path, "maps/%s.prt", gs_filename );
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load = Com_LoadScript( path, NULL, 0 );
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if (!load) Sys_Error ("LoadPortals: couldn't read %s\n", path);
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Msg ("reading %s\n", path);
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strcpy(magic, Com_GetToken( true ));
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portalclusters = atoi(Com_GetToken( true ));
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numportals = atoi(Com_GetToken( true ));
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if (!portalclusters && !numportals) Sys_Error ("LoadPortals: failed to read header");
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if (strcmp(magic, PORTALFILE)) Sys_Error ("LoadPortals: not a portal file");
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Msg ("%4i portalclusters\n", portalclusters);
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Msg ("%4i numportals\n", numportals);
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// these counts should take advantage of 64 bit systems automatically
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leafbytes = ((portalclusters+63)&~63)>>3;
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leaflongs = leafbytes/sizeof(long);
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portalbytes = ((numportals*2+63)&~63)>>3;
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portallongs = portalbytes/sizeof(long);
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// each file portal is split into two memory portals
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portals = Malloc(2 * numportals * sizeof(visportal_t));
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leafs = Malloc(portalclusters*sizeof(leaf_t));
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originalvismapsize = portalclusters*leafbytes;
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uncompressedvis = Malloc(originalvismapsize);
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vismap = vismap_p = dvisdata;
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dvis->numclusters = portalclusters;
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vismap_p = (byte *)&dvis->bitofs[portalclusters];
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vismap_end = vismap + MAX_MAP_VISIBILITY;
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for (i = 0, p = portals; i < numportals; i++)
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{
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numpoints = atoi(Com_GetToken( true )); //newline
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leafnums[0] = atoi(Com_GetToken( false ));
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leafnums[1] = atoi(Com_GetToken( false ));
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//Msg("%d %d %d ", numpoints, leafnums[0], leafnums[1] );
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if (numpoints > MAX_POINTS_ON_WINDING)
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Sys_Error ("LoadPortals: portal %i has too many points", i);
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if ((unsigned)leafnums[0] > portalclusters || (unsigned)leafnums[1] > portalclusters)
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Sys_Error ("LoadPortals: reading portal %i", i);
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w = p->winding = NewVisWinding(numpoints);
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w->original = true;
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w->numpoints = numpoints;
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for (j = 0; j < numpoints; j++)
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{
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double v[3];
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int k;
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// scanf into double, then assign to vec_t
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// so we don't care what size vec_t is
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Com_GetToken( false ); //get '(' symbol
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if(!Com_MatchToken( "(" )) Sys_Error ("LoadPortals: not found ( reading portal %i", i);
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v[0] = atof(Com_GetToken( false ));
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v[1] = atof(Com_GetToken( false ));
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v[2] = atof(Com_GetToken( false ));
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//Msg("( %g %g %g )", v[0], v[1], v[2] );
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Com_GetToken( false );
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if(!Com_MatchToken( ")" )) Sys_Error ("LoadPortals: not found ) reading portal %i", i);
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for (k = 0; k < 3; k++) w->points[j][k] = v[k];
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}
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// calc plane
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PlaneFromWinding (w, &plane);
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// create forward portal
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l = &leafs[leafnums[0]];
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if (l->numportals == MAX_PORTALS_ON_LEAF) Sys_Error ("Leaf with too many portals");
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l->portals[l->numportals] = p;
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l->numportals++;
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p->winding = w;
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VectorSubtract (vec3_origin, plane.normal, p->plane.normal);
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p->plane.dist = -plane.dist;
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p->leaf = leafnums[1];
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SetPortalSphere (p);
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p++;
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// create backwards portal
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l = &leafs[leafnums[1]];
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if (l->numportals == MAX_PORTALS_ON_LEAF) Sys_Error ("Leaf with too many portals");
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l->portals[l->numportals] = p;
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l->numportals++;
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p->winding = NewVisWinding(w->numpoints);
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p->winding->numpoints = w->numpoints;
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for (j=0 ; j<w->numpoints ; j++)
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{
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VectorCopy (w->points[w->numpoints-1-j], p->winding->points[j]);
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}
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p->plane = plane;
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p->leaf = leafnums[0];
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SetPortalSphere (p);
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p++;
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}
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}
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void ClusterPHS( int clusternum )
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{
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int j, k, l, index;
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int bitbyte;
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long *dest, *src;
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byte *scan;
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byte uncompressed[MAX_MAP_LEAFS/8];
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byte compressed[MAX_MAP_LEAFS/8];
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scan = uncompressedvis + clusternum * leafbytes;
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Mem_Copy (uncompressed, scan, leafbytes);
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for (j = 0; j < leafbytes; j++)
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{
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bitbyte = scan[j];
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if (!bitbyte) continue;
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for (k = 0; k < 8; k++)
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{
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if (! (bitbyte & (1<<k))) continue;
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// OR this pvs row into the phs
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index = ((j<<3)+k);
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if (index >= portalclusters)
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Sys_Error ("Bad bit in PVS"); // pad bits should be 0
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src = (long *)(uncompressedvis + index*leafbytes);
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dest = (long *)uncompressed;
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for (l = 0; l < leaflongs; l++) ((long *)uncompressed)[l] |= src[l];
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}
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}
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for (j = 0; j < portalclusters; j++)
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if (uncompressed[j>>3] & (1<<(j&7)) )
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totalphs++;
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// compress the bit string
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j = CompressVis (uncompressed, compressed);
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dest = (long *)vismap_p;
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vismap_p += j;
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if (vismap_p > vismap_end)
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Sys_Error ("Vismap expansion overflow");
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dvis->bitofs[clusternum][DVIS_PHS] = (byte *)dest-vismap;
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Mem_Copy (dest, compressed, j);
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}
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/*
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================
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CalcPHS
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Calculate the PHS (Potentially Hearable Set)
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by ORing together all the PVS visible from a leaf
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================
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*/
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void CalcPHS (void)
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{
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Msg ("Building PHS...\n");
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RunThreadsOnIndividual (portalclusters, true, ClusterPHS);
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Msg("Average clusters hearable: %i\n", totalphs/portalclusters);
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}
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/*
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===========
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main
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===========
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*/
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void WvisMain ( bool option )
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{
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fastvis = !option;
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if(!LoadBSPFile())
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{
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// map not exist, create it
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WbspMain( false );
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LoadBSPFile();
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}
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if (numnodes == 0 || numfaces == 0) Sys_Error ("Empty map");
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Msg ("---- Visibility ---- [%s]\n", fastvis ? "fast" : "full" );
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LoadPortals ();
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CalcVis ();
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CalcPHS ();
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visdatasize = vismap_p - dvisdata;
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Msg ("visdatasize:%i compressed from %i\n", visdatasize, originalvismapsize*2);
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WriteBSPFile();
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}
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