Source code, broken...

1 files changed, 1315 insertions, 0 deletions

diff --git a/src/engine/pvs.cpp b/src/engine/pvs.cpp
new file mode 100644
index 0000000..0f29bf5
--- /dev/null
+++ b/src/engine/pvs.cpp
@@ -0,0 +1,1315 @@
+#include "engine.h"
+
+enum
+{
+    PVS_HIDE_GEOM = 1<<0,
+    PVS_HIDE_BB   = 1<<1
+};
+
+struct pvsnode
+{
+    bvec edges;
+    uchar flags;
+    uint children;
+};
+
+static vector<pvsnode> origpvsnodes;
+
+static bool mergepvsnodes(pvsnode &p, pvsnode *children)
+{
+    loopi(7) if(children[i].flags!=children[7].flags) return false;
+    bvec bbs[4];
+    loop(x, 2) loop(y, 2)
+    {
+        const bvec &lo = children[octaindex(2, x, y, 0)].edges,
+                   &hi = children[octaindex(2, x, y, 1)].edges;
+        if(lo.x!=0xFF && (lo.x&0x11 || lo.y&0x11 || lo.z&0x11)) return false;
+        if(hi.x!=0xFF && (hi.x&0x11 || hi.y&0x11 || hi.z&0x11)) return false;
+
+#define MERGEBBS(res, coord, row, col) \
+        if(lo.coord==0xFF) \
+        { \
+            if(hi.coord!=0xFF) \
+            { \
+                res.coord = ((hi.coord&~0x11)>>1) + 0x44; \
+                res.row = hi.row; \
+                res.col = hi.col; \
+            } \
+        } \
+        else if(hi.coord==0xFF) \
+        { \
+            res.coord = (lo.coord&0xEE)>>1; \
+            res.row = lo.row; \
+            res.col = lo.col; \
+        } \
+        else if(lo.row!=hi.row || lo.col!=hi.col || (lo.coord&0xF0)!=0x80 || (hi.coord&0xF)!=0) return false; \
+        else \
+        { \
+            res.coord = ((lo.coord&~0xF1)>>1) | (((hi.coord&~0x1F)>>1) + 0x40); \
+            res.row = lo.row; \
+            res.col = lo.col; \
+        }
+
+        bvec &res = bbs[x + 2*y];
+        MERGEBBS(res, z, x, y);
+        res.x = lo.x;
+        res.y = lo.y;
+    }
+    loop(x, 2)
+    {
+        bvec &lo = bbs[x], &hi = bbs[x+2];
+        MERGEBBS(lo, y, x, z);
+    }
+    bvec &lo = bbs[0], &hi = bbs[1];
+    MERGEBBS(p.edges, x, y, z);
+
+    return true;
+}
+
+static void genpvsnodes(cube *c, int parent = 0, const ivec &co = ivec(0, 0, 0), int size = worldsize/2)
+{
+    int index = origpvsnodes.length();
+    loopi(8)
+    {
+        ivec o(i, co, size);
+        pvsnode &n = origpvsnodes.add();
+        n.flags = 0;
+        n.children = 0;
+        if(c[i].children || isempty(c[i]) || c[i].material&MAT_ALPHA) memset(n.edges.v, 0xFF, 3);
+        else loopk(3)
+        {
+            uint face = c[i].faces[k];
+            if(face==F_SOLID) n.edges[k] = 0x80;
+            else
+            {
+                uchar low = max(max(face&0xF, (face>>8)&0xF), max((face>>16)&0xF, (face>>24)&0xF)),
+                      high = min(min((face>>4)&0xF, (face>>12)&0xF), min((face>>20)&0xF, (face>>28)&0xF));
+                if(size<8)
+                {
+                    if(low&((8/size)-1)) { low += 8/size - (low&((8/size)-1)); }
+                    if(high&((8/size)-1)) high &= ~(8/size-1);
+                }
+                if(low >= high) { memset(n.edges.v, 0xFF, 3); break; }
+                n.edges[k] = low | (high<<4);
+            }
+        }
+    }
+    int branches = 0;
+    loopi(8) if(c[i].children)
+    {
+        ivec o(i, co, size);
+        genpvsnodes(c[i].children, index+i, o, size>>1);
+        if(origpvsnodes[index+i].children) branches++;
+    }
+    if(!branches && mergepvsnodes(origpvsnodes[parent], &origpvsnodes[index])) origpvsnodes.setsize(index);
+    else origpvsnodes[parent].children = index;
+}
+
+struct shaftplane
+{
+    float r, c, offset;
+    uchar rnear, cnear, rfar, cfar;
+};
+
+struct shaftbb
+{
+    union
+    {
+        ushort v[6];
+        struct { usvec min, max; };
+    };
+
+    shaftbb() {}
+    shaftbb(const ivec &o, int size)
+    {
+        min.x = o.x;
+        min.y = o.y;
+        min.z = o.z;
+        max.x = o.x + size;
+        max.y = o.y + size;
+        max.z = o.z + size;
+    }
+    shaftbb(const ivec &o, int size, const bvec &edges)
+    {
+        min.x = o.x + (size*(edges.x&0xF))/8;
+        min.y = o.y + (size*(edges.y&0xF))/8;
+        min.z = o.z + (size*(edges.z&0xF))/8;
+        max.x = o.x + (size*(edges.x>>4))/8;
+        max.y = o.y + (size*(edges.y>>4))/8;
+        max.z = o.z + (size*(edges.z>>4))/8;
+    }
+
+    ushort &operator[](int i) { return v[i]; }
+    ushort operator[](int i) const { return v[i]; }
+
+    bool contains(const shaftbb &o) const
+    {
+        return min.x<=o.min.x && min.y<=o.min.y && min.z<=o.min.z &&
+               max.x>=o.max.x && max.y>=o.max.y && max.z>=o.max.z;
+    }
+
+    bool outside(const ivec &o, int size) const
+    {
+        return o.x>=max.x || o.y>=max.y || o.z>=max.z ||
+               o.x+size<=min.x || o.y+size<=min.y || o.z+size<=min.z;
+    }
+
+    bool outside(const shaftbb &o) const
+    {
+        return o.min.x>max.x || o.min.y>max.y || o.min.z>max.z ||
+               o.max.x<min.x || o.max.y<min.y || o.max.z<min.z;
+    }
+
+    bool notinside(const shaftbb &o) const
+    {
+        return o.min.x<min.x || o.min.y<min.y || o.min.z<min.z ||
+               o.max.x>max.x || o.max.y>max.y || o.max.z>max.z;
+    }
+};
+
+struct shaft
+{
+    shaftbb bounds;
+    shaftplane planes[8];
+    int numplanes;
+
+    shaft(const shaftbb &from, const shaftbb &to)
+    {
+        calcshaft(from, to);
+    }
+
+    void calcshaft(const shaftbb &from, const shaftbb &to)
+    {
+        uchar match = 0, color = 0;
+        loopi(3)
+        {
+            if(to.min[i] < from.min[i]) { color |= 1<<i; bounds.min[i] = 0; }
+            else if(to.min[i] > from.min[i]) bounds.min[i] = to.min[i]+1;
+            else { match |= 1<<i; bounds.min[i] = to.min[i]; }
+
+            if(to.max[i] > from.max[i]) { color |= 8<<i; bounds.max[i] = USHRT_MAX; }
+            else if(to.max[i] < from.max[i]) bounds.max[i] = to.max[i]-1;
+            else { match |= 8<<i; bounds.max[i] = to.max[i]; }
+        }
+        numplanes = 0;
+        loopi(5) if(!(match&(1<<i))) for(int j = i+1; j<6; j++) if(!(match&(1<<j)) && i+3!=j && ((color>>i)^(color>>j))&1)
+        {
+            int r = i%3, c = j%3, d = (r+1)%3;
+            if(d==c) d = (c+1)%3;
+            shaftplane &p = planes[numplanes++];
+            p.r = from[j] - to[j];
+            if(i<3 ? p.r >= 0 : p.r < 0)
+            {
+                p.r = -p.r;
+                p.c = from[i] - to[i];
+            }
+            else p.c = to[i] - from[i];
+            p.offset = -(from[i]*p.r + from[j]*p.c);
+            p.rnear = p.r >= 0 ? r : 3+r;
+            p.cnear = p.c >= 0 ? c : 3+c;
+            p.rfar = p.r < 0 ? r : 3+r;
+            p.cfar = p.c < 0 ? c : 3+c;
+        }
+    }
+
+    bool outside(const shaftbb &o) const
+    {
+        if(bounds.outside(o)) return true;
+
+        for(const shaftplane *p = planes; p < &planes[numplanes]; p++)
+        {
+            if(o[p->rnear]*p->r + o[p->cnear]*p->c + p->offset > 0) return true;
+        }
+        return false;
+    }
+
+    bool inside(const shaftbb &o) const
+    {
+        if(bounds.notinside(o)) return false;
+
+        for(const shaftplane *p = planes; p < &planes[numplanes]; p++)
+        {
+            if(o[p->rfar]*p->r + o[p->cfar]*p->c + p->offset > 0) return false;
+        }
+        return true;
+    }
+};
+
+struct pvsdata
+{
+    int offset, len;
+
+    pvsdata() {}
+    pvsdata(int offset, int len) : offset(offset), len(len) {}
+};
+
+static vector<uchar> pvsbuf;
+
+static inline uint hthash(const pvsdata &k)
+{
+    uint h = 5381;
+    loopi(k.len) h = ((h<<5)+h)^pvsbuf[k.offset+i];
+    return h;
+}
+
+static inline bool htcmp(const pvsdata &x, const pvsdata &y)
+{
+    return x.len==y.len && !memcmp(&pvsbuf[x.offset], &pvsbuf[y.offset], x.len);
+}
+
+static SDL_mutex *pvsmutex = NULL;
+static hashtable<pvsdata, int> pvscompress;
+static vector<pvsdata> pvs;
+
+static SDL_mutex *viewcellmutex = NULL;
+struct viewcellrequest
+{
+    int *result;
+    ivec o;
+    int size;
+};
+static vector<viewcellrequest> viewcellrequests;
+
+static bool genpvs_canceled = false;
+static int numviewcells = 0;
+
+VAR(maxpvsblocker, 1, 512, 1<<16);
+VAR(pvsleafsize, 1, 64, 1024);
+
+#define MAXWATERPVS 32
+
+static struct
+{
+    int height;
+    vector<materialsurface *> matsurfs;
+} waterplanes[MAXWATERPVS];
+static vector<materialsurface *> waterfalls;
+uint numwaterplanes = 0;
+
+struct pvsworker
+{
+    pvsworker() : thread(NULL), pvsnodes(new pvsnode[origpvsnodes.length()])
+    {
+    }
+    ~pvsworker()
+    {
+        delete[] pvsnodes;
+    }
+
+    SDL_Thread *thread;
+    pvsnode *pvsnodes;
+
+    shaftbb viewcellbb;
+
+    pvsnode *levels[32];
+    int curlevel;
+    ivec origin;
+
+    void resetlevels()
+    {
+        curlevel = worldscale;
+        levels[curlevel] = &pvsnodes[0];
+        origin = ivec(0, 0, 0);
+    }
+
+    int hasvoxel(const ivec &p, int coord, int dir, int ocoord = 0, int odir = 0, int *omin = NULL)
+    {
+        uint diff = (origin.x^p.x)|(origin.y^p.y)|(origin.z^p.z);
+        if(diff >= uint(worldsize)) return 0;
+        diff >>= curlevel;
+        while(diff)
+        {
+            curlevel++;
+            diff >>= 1;
+        }
+
+        pvsnode *cur = levels[curlevel];
+        while(cur->children && !(cur->flags&PVS_HIDE_BB))
+        {
+            cur = &pvsnodes[cur->children];
+            curlevel--;
+            cur += ((p.z>>(curlevel-2))&4) | ((p.y>>(curlevel-1))&2) | ((p.x>>curlevel)&1);
+            levels[curlevel] = cur;
+        }
+
+        origin = ivec(p.x&(~0U<<curlevel), p.y&(~0U<<curlevel), p.z&(~0U<<curlevel));
+
+        if(cur->flags&PVS_HIDE_BB || cur->edges==bvec(0x80, 0x80, 0x80))
+        {
+            if(omin)
+            {
+                int step = origin[ocoord] + (odir<<curlevel) - p[ocoord] + odir - 1;
+                if(odir ? step < *omin : step > *omin) *omin = step;
+            }
+            return origin[coord] + (dir<<curlevel) - p[coord] + dir - 1;
+        }
+
+        if(cur->edges.x==0xFF) return 0;
+        ivec bbp(p);
+        bbp.sub(origin);
+        ivec bbmin, bbmax;
+        bbmin.x = ((cur->edges.x&0xF)<<curlevel)/8;
+        if(bbp.x < bbmin.x) return 0;
+        bbmax.x = ((cur->edges.x>>4)<<curlevel)/8;
+        if(bbp.x >= bbmax.x) return 0;
+        bbmin.y = ((cur->edges.y&0xF)<<curlevel)/8;
+        if(bbp.y < bbmin.y) return 0;
+        bbmax.y = ((cur->edges.y>>4)<<curlevel)/8;
+        if(bbp.y >= bbmax.y) return 0;
+        bbmin.z = ((cur->edges.z&0xF)<<curlevel)/8;
+        if(bbp.z < bbmin.z) return 0;
+        bbmax.z = ((cur->edges.z>>4)<<curlevel)/8;
+        if(bbp.z >= bbmax.z) return 0;
+
+        if(omin)
+        {
+            int step = (odir ? bbmax[ocoord] : bbmin[ocoord]) - bbp[ocoord] + (odir - 1);
+            if(odir ? step < *omin : step > *omin) *omin = step;
+        }
+        return (dir ? bbmax[coord] : bbmin[coord]) - bbp[coord] + (dir - 1);
+    }
+
+    void hidepvs(pvsnode &p)
+    {
+        if(p.children)
+        {
+            pvsnode *children = &pvsnodes[p.children];
+            loopi(8) hidepvs(children[i]);
+            p.flags |= PVS_HIDE_BB;
+            return;
+        }
+        p.flags |= PVS_HIDE_BB;
+        if(p.edges.x!=0xFF) p.flags |= PVS_HIDE_GEOM;
+    }
+
+    void shaftcullpvs(shaft &s, pvsnode &p, const ivec &co = ivec(0, 0, 0), int size = worldsize)
+    {
+        if(p.flags&PVS_HIDE_BB) return;
+        shaftbb bb(co, size);
+        if(s.outside(bb)) return;
+        if(s.inside(bb)) { hidepvs(p); return; }
+        if(p.children)
+        {
+            pvsnode *children = &pvsnodes[p.children];
+            uchar flags = 0xFF;
+            loopi(8)
+            {
+                ivec o(i, co, size>>1);
+                shaftcullpvs(s, children[i], o, size>>1);
+                flags &= children[i].flags;
+            }
+            if(flags & PVS_HIDE_BB) p.flags |= PVS_HIDE_BB;
+            return;
+        }
+        if(p.edges.x==0xFF) return;
+        shaftbb geom(co, size, p.edges);
+        if(s.inside(geom)) p.flags |= PVS_HIDE_GEOM;
+    }
+
+    queue<shaftbb, 32> prevblockers;
+
+    struct cullorder
+    {
+        int index, dist;
+
+        cullorder() {}
+        cullorder(int index, int dist) : index(index), dist(dist) {}
+    };
+
+    void cullpvs(pvsnode &p, const ivec &co = ivec(0, 0, 0), int size = worldsize)
+    {
+        if(p.flags&(PVS_HIDE_BB | PVS_HIDE_GEOM) || genpvs_canceled) return;
+        if(p.children && !(p.flags&PVS_HIDE_BB))
+        {
+            pvsnode *children = &pvsnodes[p.children];
+            int csize = size>>1;
+            ivec dmin = ivec(co).add(csize>>1).sub(ivec(viewcellbb.min).add(ivec(viewcellbb.max)).shr(1)), dmax = ivec(dmin).add(csize);
+            dmin.mul(dmin);
+            dmax.mul(dmax);
+            ivec diff = ivec(dmax).sub(dmin);
+            cullorder order[8];
+            int dir = 0;
+            if(diff.x < 0) { diff.x = -diff.x; dir |= 1; }
+            if(diff.y < 0) { diff.y = -diff.y; dir |= 2; }
+            if(diff.z < 0) { diff.z = -diff.z; dir |= 4; }
+            order[0] = cullorder(0, 0);
+            order[7] = cullorder(7, diff.x + diff.y + diff.z);
+            order[1] = cullorder(1, diff.x);
+            order[2] = cullorder(2, diff.y);
+            order[3] = cullorder(4, diff.z);
+            if(order[2].dist < order[1].dist) swap(order[1], order[2]);
+            if(order[3].dist < order[2].dist) swap(order[2], order[3]);
+            if(order[2].dist < order[1].dist) swap(order[1], order[2]);
+            cullorder dxy(order[1].index|order[2].index, order[1].dist+order[2].dist),
+                      dxz(order[1].index|order[3].index, order[1].dist+order[3].dist),
+                      dyz(order[2].index|order[3].index, order[2].dist+order[3].dist);
+            int j;
+            for(j = 4; j > 0 && dxy.dist < order[j-1].dist; --j) order[j] = order[j-1];
+            order[j] = dxy;
+            for(j = 5; j > 0 && dxz.dist < order[j-1].dist; --j) order[j] = order[j-1];
+            order[j] = dxz;
+            for(j = 6; j > 0 && dyz.dist < order[j-1].dist; --j) order[j] = order[j-1];
+            order[j] = dyz;
+            loopi(8)
+            {
+                int index = order[i].index^dir;
+                ivec o(index, co, csize);
+                cullpvs(children[index], o, csize);
+            }
+            if(!(p.flags & PVS_HIDE_BB)) return;
+        }
+        bvec edges = p.children ? bvec(0x80, 0x80, 0x80) : p.edges;
+        if(edges.x==0xFF) return;
+        shaftbb geom(co, size, edges);
+        ivec diff = ivec(geom.max).sub(ivec(viewcellbb.min)).abs();
+        cullorder order[3] = { cullorder(0, diff.x), cullorder(1, diff.y), cullorder(2, diff.z) };
+        if(order[1].dist > order[0].dist) swap(order[0], order[1]);
+        if(order[2].dist > order[1].dist) swap(order[1], order[2]);
+        if(order[1].dist > order[0].dist) swap(order[0], order[1]);
+        loopi(6)
+        {
+            int dim = order[i >= 3 ? i-3 : i].index, dc = (i >= 3) != (geom.max[dim] <= viewcellbb.min[dim]) ? 1 : 0, r = R[dim], c = C[dim];
+            int ccenter = geom.min[c];
+            if(geom.min[r]==geom.max[r] || geom.min[c]==geom.max[c]) continue;
+            while(ccenter < geom.max[c])
+            {
+                ivec rmin;
+                rmin[dim] = geom[dim + 3*dc] + (dc ? -1 : 0);
+                rmin[r] = geom.min[r];
+                rmin[c] = ccenter;
+                ivec rmax = rmin;
+                rmax[r] = geom.max[r] - 1;
+                int rcenter = (rmin[r] + rmax[r])/2;
+                resetlevels();
+                for(int minstep = -1, maxstep = 1; (minstep || maxstep) && rmax[r] - rmin[r] < maxpvsblocker;)
+                {
+                    if(minstep) minstep = hasvoxel(rmin, r, 0);
+                    if(maxstep) maxstep = hasvoxel(rmax, r, 1);
+                    rmin[r] += minstep;
+                    rmax[r] += maxstep;
+                }
+                rmin[r] = rcenter + (rmin[r] - rcenter)/2;
+                rmax[r] = rcenter + (rmax[r] - rcenter)/2;
+                if(rmin[r]>=geom.min[r] && rmax[r]<geom.max[r]) { rmin[r] = geom.min[r]; rmax[r] = geom.max[r] - 1; }
+                ivec cmin = rmin, cmax = rmin;
+                if(rmin[r]>=geom.min[r] && rmax[r]<geom.max[r])
+                {
+                    cmin[c] = geom.min[c];
+                    cmax[c] = geom.max[c]-1;
+                }
+                int cminstep = -1, cmaxstep = 1;
+                for(; (cminstep || cmaxstep) && cmax[c] - cmin[c] < maxpvsblocker;)
+                {
+                    if(cminstep)
+                    {
+                        cmin[c] += cminstep; cminstep = INT_MIN;
+                        cmin[r] = rmin[r];
+                        resetlevels();
+                        for(int rstep = 1; rstep && cmin[r] <= rmax[r];)
+                        {
+                            rstep = hasvoxel(cmin, r, 1, c, 0, &cminstep);
+                            cmin[r] += rstep;
+                        }
+                        if(cmin[r] <= rmax[r]) cminstep = 0;
+                    }
+                    if(cmaxstep)
+                    {
+                        cmax[c] += cmaxstep; cmaxstep = INT_MAX;
+                        cmax[r] = rmin[r];
+                        resetlevels();
+                        for(int rstep = 1; rstep && cmax[r] <= rmax[r];)
+                        {
+                            rstep = hasvoxel(cmax, r, 1, c, 1, &cmaxstep);
+                            cmax[r] += rstep;
+                        }
+                        if(cmax[r] <= rmax[r]) cmaxstep = 0;
+                    }
+                }
+                if(!cminstep) cmin[c]++;
+                if(!cmaxstep) cmax[c]--;
+                ivec emin = rmin, emax = rmax;
+                if(cmin[c]>=geom.min[c] && cmax[c]<geom.max[c])
+                {
+                    if(emin[r]>geom.min[r]) emin[r] = geom.min[r];
+                    if(emax[r]<geom.max[r]-1) emax[r] = geom.max[r]-1;
+                }
+                int rminstep = -1, rmaxstep = 1;
+                for(; (rminstep || rmaxstep) && emax[r] - emin[r] < maxpvsblocker;)
+                {
+                    if(rminstep)
+                    {
+                        emin[r] += -1; rminstep = INT_MIN;
+                        emin[c] = cmin[c];
+                        resetlevels();
+                        for(int cstep = 1; cstep && emin[c] <= cmax[c];)
+                        {
+                            cstep = hasvoxel(emin, c, 1, r, 0, &rminstep);
+                            emin[c] += cstep;
+                        }
+                        if(emin[c] <= cmax[c]) rminstep = 0;
+                    }
+                    if(rmaxstep)
+                    {
+                        emax[r] += 1; rmaxstep = INT_MAX;
+                        emax[c] = cmin[c];
+                        resetlevels();
+                        for(int cstep = 1; cstep && emax[c] <= cmax[c];)
+                        {
+                            cstep = hasvoxel(emax, c, 1, r, 1, &rmaxstep);
+                            emax[c] += cstep;
+                        }
+                        if(emax[c] <= cmax[c]) rmaxstep = 0;
+                    }
+                }
+                if(!rminstep) emin[r]++;
+                if(!rmaxstep) emax[r]--;
+                shaftbb bb;
+                bb.min[dim] = rmin[dim];
+                bb.max[dim] = rmin[dim]+1;
+                bb.min[r] = emin[r];
+                bb.max[r] = emax[r]+1;
+                bb.min[c] = cmin[c];
+                bb.max[c] = cmax[c]+1;
+                if(bb.min[dim] >= viewcellbb.max[dim] || bb.max[dim] <= viewcellbb.min[dim])
+                {
+                    int ddir = bb.min[dim] >= viewcellbb.max[dim] ? 1 : -1,
+                        dval = ddir>0 ? USHRT_MAX-1 : 0,
+                        dlimit = maxpvsblocker,
+                        numsides = 0;
+                    loopj(4)
+                    {
+                        ivec dmax;
+                        int odim = j < 2 ? c : r;
+                        if(j&1)
+                        {
+                            if(bb.max[odim] >= viewcellbb.max[odim]) continue;
+                            dmax[odim] = bb.max[odim]-1;
+                        }
+                        else
+                        {
+                            if(bb.min[odim] <= viewcellbb.min[odim]) continue;
+                            dmax[odim] = bb.min[odim];
+                        }
+                        numsides++;
+                        dmax[dim] = bb.min[dim];
+                        int stepdim = j < 2 ? r : c, stepstart = bb.min[stepdim], stepend = bb.max[stepdim];
+                        int dstep = ddir;
+                        for(; dstep && ddir*(dmax[dim] - (int)bb.min[dim]) < dlimit;)
+                        {
+                            dmax[dim] += dstep; dstep = ddir > 0 ? INT_MAX : INT_MIN;
+                            dmax[stepdim] = stepstart;
+                            resetlevels();
+                            for(int step = 1; step && dmax[stepdim] < stepend;)
+                            {
+                                step = hasvoxel(dmax, stepdim, 1, dim, (ddir+1)/2, &dstep);
+                                dmax[stepdim] += step;
+                            }
+                            if(dmax[stepdim] < stepend) dstep = 0;
+                        }
+                        dlimit = min(dlimit, ddir*(dmax[dim] - (int)bb.min[dim]));
+                        if(!dstep) dmax[dim] -= ddir;
+                        if(ddir>0) dval = min(dval, dmax[dim]);
+                        else dval = max(dval, dmax[dim]);
+                    }
+                    if(numsides>0)
+                    {
+                        if(ddir>0) bb.max[dim] = dval+1;
+                        else bb.min[dim] = dval;
+                    }
+                    //printf("(%d,%d,%d) x %d,%d,%d, side %d, ccenter = %d, origin = (%d,%d,%d), size = %d\n", bb.min.x, bb.min.y, bb.min.z, bb.max.x-bb.min.x, bb.max.y-bb.min.y, bb.max.z-bb.min.z, i, ccenter, co.x, co.y, co.z, size);
+                }
+                bool dup = false;
+                loopvj(prevblockers)
+                {
+                    if(prevblockers[j].contains(bb)) { dup = true; break; }
+                }
+                if(!dup)
+                {
+                    shaft s(viewcellbb, bb);
+                    shaftcullpvs(s, pvsnodes[0]);
+                    prevblockers.add(bb);
+                }
+                if(bb.contains(geom)) return;
+                ccenter = cmax[c] + 1;
+            }
+        }
+    }
+
+    bool compresspvs(pvsnode &p, int size, int threshold)
+    {
+        if(!p.children) return true;
+        if(p.flags&PVS_HIDE_BB) { p.children = 0; return true; }
+        pvsnode *children = &pvsnodes[p.children];
+        bool canreduce = true;
+        loopi(8)
+        {
+            if(!compresspvs(children[i], size/2, threshold)) canreduce = false;
+        }
+        if(canreduce)
+        {
+            int hide = children[7].flags&PVS_HIDE_BB;
+            loopi(7) if((children[i].flags&PVS_HIDE_BB)!=hide) canreduce = false;
+            if(canreduce) 
+            {
+                p.flags = (p.flags & ~PVS_HIDE_BB) | hide;
+                p.children = 0;
+                return true;
+            }
+        }
+        if(size <= threshold)
+        {
+            p.children = 0;
+            return true;
+        }
+        return false;
+    }
+    
+    vector<uchar> outbuf;
+
+    bool serializepvs(pvsnode &p, int storage = -1)
+    {
+        if(!p.children)
+        {
+            outbuf.add(0xFF);
+            loopi(8) outbuf.add(p.flags&PVS_HIDE_BB ? 0xFF : 0);
+            return true;
+        }
+        int index = outbuf.length();
+        pvsnode *children = &pvsnodes[p.children];
+        int i = 0;
+        uchar leafvalues = 0;
+        if(storage>=0)
+        {
+            for(; i < 8; i++)
+            {   
+                pvsnode &child = children[i];
+                if(child.flags&PVS_HIDE_BB) leafvalues |= 1<<i;
+                else if(child.children) break;
+            }
+            if(i==8) { outbuf[storage] = leafvalues; return false; }
+            // if offset won't fit, just mark the space as a visible to avoid problems
+            int offset = (index - storage + 8)/9;
+            if(offset>255) { outbuf[storage] = 0; return false; }
+            outbuf[storage] = uchar(offset);
+        }
+        outbuf.add(0);
+        loopj(8) outbuf.add(leafvalues&(1<<j) ? 0xFF : 0);
+        uchar leafmask = (1<<i)-1;
+        for(; i < 8; i++)
+        {
+            pvsnode &child = children[i];
+            if(child.children) { if(!serializepvs(child, index+1+i)) leafmask |= 1<<i; }
+            else { leafmask |= 1<<i; outbuf[index+1+i] = child.flags&PVS_HIDE_BB ? 0xFF : 0; }
+        }
+        outbuf[index] = leafmask;
+        return true;
+    }
+
+    bool materialoccluded(pvsnode &p, const ivec &co, int size, const ivec &bbmin, const ivec &bbmax)
+    {
+        pvsnode *children = &pvsnodes[p.children];
+        loopoctabox(co, size, bbmin, bbmax)
+        {
+            ivec o(i, co, size);
+            if(children[i].flags & PVS_HIDE_BB) continue;
+            if(!children[i].children || !materialoccluded(children[i], o, size/2, bbmin, bbmax)) return false;
+        }
+        return true;
+    }
+
+    bool materialoccluded(vector<materialsurface *> &matsurfs)
+    {
+        if(pvsnodes[0].flags & PVS_HIDE_BB) return true;
+        if(!pvsnodes[0].children) return false;
+        loopv(matsurfs)
+        {
+            materialsurface &m = *matsurfs[i];
+            ivec bbmin(m.o), bbmax(m.o);
+            int dim = dimension(m.orient);
+            bbmin[dim] += dimcoord(m.orient) ? -2 : 2;
+            bbmax[C[dim]] += m.csize;
+            bbmax[R[dim]] += m.rsize;
+            if(!materialoccluded(pvsnodes[0], ivec(0, 0, 0), worldsize/2, bbmin, bbmax)) return false;
+        }
+        return true;
+    }
+
+    int wateroccluded, waterbytes;
+
+    void calcpvs(const ivec &co, int size)
+    {
+        loopk(3)
+        {
+            viewcellbb.min[k] = co[k];
+            viewcellbb.max[k] = co[k]+size;
+        }
+        memcpy(pvsnodes, origpvsnodes.getbuf(), origpvsnodes.length()*sizeof(pvsnode));
+        prevblockers.clear();
+        cullpvs(pvsnodes[0]);
+
+        wateroccluded = 0;
+        loopi(numwaterplanes)
+        {
+            if(waterplanes[i].height < 0)
+            {
+                if(waterfalls.length() && materialoccluded(waterfalls)) wateroccluded |= 1<<i;
+            }
+            else if(waterplanes[i].matsurfs.length() && materialoccluded(waterplanes[i].matsurfs)) wateroccluded |= 1<<i;
+        }
+        waterbytes = 0;
+        loopi(4) if(wateroccluded&(0xFF<<(i*8))) waterbytes = i+1;
+
+        compresspvs(pvsnodes[0], worldsize, pvsleafsize);
+        outbuf.setsize(0);
+        serializepvs(pvsnodes[0]);
+    }
+
+    uchar *testviewcell(const ivec &co, int size, int *waterpvs = NULL, int *len = NULL)
+    {
+        calcpvs(co, size);
+
+        uchar *buf = new uchar[outbuf.length()];
+        memcpy(buf, outbuf.getbuf(), outbuf.length());
+        if(waterpvs) *waterpvs = wateroccluded;
+        if(len) *len = outbuf.length();
+        return buf;
+    }
+
+    int genviewcell(const ivec &co, int size)
+    {
+        calcpvs(co, size);
+
+        if(pvsmutex) SDL_LockMutex(pvsmutex);
+        numviewcells++;
+        pvsdata key(pvsbuf.length(), waterbytes + outbuf.length());
+        loopi(waterbytes) pvsbuf.add((wateroccluded>>(i*8))&0xFF);
+        pvsbuf.put(outbuf.getbuf(), outbuf.length());
+        int *val = pvscompress.access(key);
+        if(val) pvsbuf.setsize(key.offset);
+        else
+        {
+            val = &pvscompress[key];
+            *val = pvs.length();
+            pvs.add(key);
+        }
+        if(pvsmutex) SDL_UnlockMutex(pvsmutex);
+        return *val;
+    }
+
+    static int run(void *data)
+    {
+        pvsworker *w = (pvsworker *)data;
+        SDL_LockMutex(viewcellmutex);
+        while(viewcellrequests.length())
+        {
+            viewcellrequest req = viewcellrequests.pop();
+            SDL_UnlockMutex(viewcellmutex);
+            int result = w->genviewcell(req.o, req.size);
+            SDL_LockMutex(viewcellmutex);
+            *req.result = result;
+        }
+        SDL_UnlockMutex(viewcellmutex);
+        return 0;
+    }
+};
+
+struct viewcellnode
+{
+    uchar leafmask;
+    union viewcellchild
+    {
+        int pvs;
+        viewcellnode *node;
+    } children[8];
+
+    viewcellnode() : leafmask(0xFF)
+    {
+        loopi(8) children[i].pvs = -1;
+    }
+    ~viewcellnode()
+    {
+        loopi(8) if(!(leafmask&(1<<i))) delete children[i].node;
+    }
+};
+
+VARP(pvsthreads, 0, 0, 16);
+static vector<pvsworker *> pvsworkers;
+
+static volatile bool check_genpvs_progress = false;
+
+static Uint32 genpvs_timer(Uint32 interval, void *param)
+{
+    check_genpvs_progress = true;
+    return interval;
+}
+
+static int totalviewcells = 0;
+
+static void show_genpvs_progress(int unique = pvs.length(), int processed = numviewcells)
+{
+    float bar1 = float(processed) / float(totalviewcells>0 ? totalviewcells : 1);
+
+    defformatstring(text1, "%d%% - %d of %d view cells (%d unique)", int(bar1 * 100), processed, totalviewcells, unique);
+
+    renderprogress(bar1, text1);
+
+    if(interceptkey(SDLK_ESCAPE)) genpvs_canceled = true;
+    check_genpvs_progress = false;
+}
+
+static shaftbb pvsbounds;
+
+static void calcpvsbounds()
+{
+    loopk(3) pvsbounds.min[k] = USHRT_MAX;
+    loopk(3) pvsbounds.max[k] = 0;
+    loopv(valist)
+    {
+        vtxarray *va = valist[i];
+        loopk(3)
+        {
+            if(va->geommin[k]>va->geommax[k]) continue;
+            pvsbounds.min[k] = min(pvsbounds.min[k], (ushort)va->geommin[k]);
+            pvsbounds.max[k] = max(pvsbounds.max[k], (ushort)va->geommax[k]);
+        }
+    }
+}
+
+static inline bool isallclip(cube *c)
+{
+    loopi(8)
+    {
+        cube &h = c[i];
+        if(h.children ? !isallclip(h.children) : (!isentirelysolid(h) && (h.material&MATF_CLIP)!=MAT_CLIP))
+            return false;
+    }
+    return true;
+}
+   
+static int countviewcells(cube *c, const ivec &co, int size, int threshold)
+{
+    int count = 0;
+    loopi(8)
+    {
+        ivec o(i, co, size);
+        if(pvsbounds.outside(o, size)) continue;
+        cube &h = c[i];
+        if(h.children)
+        {
+            if(size>threshold)
+            {
+                count += countviewcells(h.children, o, size>>1, threshold);
+                continue;
+            }
+            if(isallclip(h.children)) continue;
+        }
+        else if(isentirelysolid(h) || (h.material&MATF_CLIP)==MAT_CLIP) continue;
+        count++;
+    }
+    return count;
+}
+
+static void genviewcells(viewcellnode &p, cube *c, const ivec &co, int size, int threshold)
+{
+    if(genpvs_canceled) return;
+    loopi(8)
+    {
+        ivec o(i, co, size);
+        if(pvsbounds.outside(o, size)) continue;
+        cube &h = c[i];
+        if(h.children)
+        {
+            if(size>threshold)
+            {
+                p.leafmask &= ~(1<<i);
+                p.children[i].node = new viewcellnode;
+                genviewcells(*p.children[i].node, h.children, o, size>>1, threshold);
+                continue;
+            }
+            if(isallclip(h.children)) continue;
+        }
+        else if(isentirelysolid(h) || (h.material&MATF_CLIP)==MAT_CLIP) continue;
+        if(pvsworkers.length())
+        {
+            if(genpvs_canceled) return;
+            p.children[i].pvs = pvsworkers[0]->genviewcell(o, size);
+            if(check_genpvs_progress) show_genpvs_progress();
+        }
+        else
+        {
+            viewcellrequest &req = viewcellrequests.add();
+            req.result = &p.children[i].pvs;
+            req.o = o;
+            req.size = size;
+        }
+    }
+}
+
+static viewcellnode *viewcells = NULL;
+static int lockedwaterplanes[MAXWATERPVS];
+static uchar *curpvs = NULL, *lockedpvs = NULL;
+static int curwaterpvs = 0, lockedwaterpvs = 0;
+
+static inline pvsdata *lookupviewcell(const vec &p)
+{
+    uint x = uint(floor(p.x)), y = uint(floor(p.y)), z = uint(floor(p.z));
+    if(!viewcells || (x|y|z)>=uint(worldsize)) return NULL;
+    viewcellnode *vc = viewcells;
+    for(int scale = worldscale-1; scale>=0; scale--)
+    {
+        int i = octastep(x, y, z, scale);
+        if(vc->leafmask&(1<<i))
+        {
+            return vc->children[i].pvs>=0 ? &pvs[vc->children[i].pvs] : NULL;
+        }
+        vc = vc->children[i].node;
+    }
+    return NULL;
+}
+
+static void lockpvs_(bool lock)
+{
+    if(lockedpvs) DELETEA(lockedpvs);
+    if(!lock) return;
+    pvsdata *d = lookupviewcell(camera1->o);
+    if(!d) return;
+    int wbytes = d->len%9, len = d->len - wbytes;
+    lockedpvs = new uchar[len];
+    memcpy(lockedpvs, &pvsbuf[d->offset + wbytes], len);
+    lockedwaterpvs = 0;
+    loopi(wbytes) lockedwaterpvs |= pvsbuf[d->offset + i] << (i*8);
+    loopi(MAXWATERPVS) lockedwaterplanes[i] = waterplanes[i].height;
+    conoutf("locked view cell at %.1f, %.1f, %.1f", camera1->o.x, camera1->o.y, camera1->o.z);
+}
+
+VARF(lockpvs, 0, 0, 1, lockpvs_(lockpvs!=0));
+
+VARN(pvs, usepvs, 0, 1, 1);
+VARN(waterpvs, usewaterpvs, 0, 1, 1);
+
+void setviewcell(const vec &p)
+{
+    if(!usepvs) curpvs = NULL;
+    else if(lockedpvs) 
+    {
+        curpvs = lockedpvs;
+        curwaterpvs = lockedwaterpvs;
+    }
+    else
+    {
+        pvsdata *d = lookupviewcell(p);
+        curpvs = d ? &pvsbuf[d->offset] : NULL;
+        curwaterpvs = 0;
+        if(d)
+        {
+            loopi(d->len%9) curwaterpvs |= *curpvs++ << (i*8);
+        }
+    }
+    if(!usepvs || !usewaterpvs) curwaterpvs = 0;
+}
+
+void clearpvs()
+{
+    DELETEP(viewcells);
+    pvs.setsize(0);
+    pvsbuf.setsize(0);
+    curpvs = NULL;
+    numwaterplanes = 0;
+    lockpvs = 0;
+    lockpvs_(false);
+}
+
+COMMAND(clearpvs, "");
+
+static void findwaterplanes()
+{
+    loopi(MAXWATERPVS)
+    {
+        waterplanes[i].height = -1;
+        waterplanes[i].matsurfs.setsize(0);
+    }
+    waterfalls.setsize(0);
+    numwaterplanes = 0;
+    loopv(valist)
+    {
+        vtxarray *va = valist[i];
+        loopj(va->matsurfs)
+        {
+            materialsurface &m = va->matbuf[j];
+            if((m.material&MATF_VOLUME)!=MAT_WATER || m.orient==O_BOTTOM) { j += m.skip; continue; }
+            if(m.orient!=O_TOP)
+            {
+                waterfalls.add(&m);
+                continue;
+            }
+            loopk(numwaterplanes) if(waterplanes[k].height == m.o.z)
+            {
+                waterplanes[k].matsurfs.add(&m);
+                goto nextmatsurf;
+            }
+            if(numwaterplanes < MAXWATERPVS)
+            {
+                waterplanes[numwaterplanes].height = m.o.z;
+                waterplanes[numwaterplanes].matsurfs.add(&m);
+                numwaterplanes++;
+            }
+        nextmatsurf:;
+        }
+    }
+    if(waterfalls.length() > 0 && numwaterplanes < MAXWATERPVS) numwaterplanes++;
+}
+
+void testpvs(int *vcsize)
+{
+    lockpvs_(false);
+
+    uint oldnumwaterplanes = numwaterplanes;
+    int oldwaterplanes[MAXWATERPVS];
+    loopi(numwaterplanes) oldwaterplanes[i] = waterplanes[i].height;
+
+    findwaterplanes();
+
+    pvsnode &root = origpvsnodes.add();
+    memset(root.edges.v, 0xFF, 3);
+    root.flags = 0;
+    root.children = 0;
+    genpvsnodes(worldroot);
+
+    genpvs_canceled = false;
+    check_genpvs_progress = false;
+
+    int size = *vcsize>0 ? *vcsize : 32;
+    for(int mask = 1; mask < size; mask <<= 1) size &= ~mask;
+
+    ivec o = ivec(camera1->o).mask(~(size-1));
+    pvsworker w;
+    int len;
+    lockedpvs = w.testviewcell(o, size, &lockedwaterpvs, &len);
+    loopi(MAXWATERPVS) lockedwaterplanes[i] = waterplanes[i].height;
+    lockpvs = 1;
+    conoutf("generated test view cell of size %d at %.1f, %.1f, %.1f (%d B)", size, camera1->o.x, camera1->o.y, camera1->o.z, len);
+
+    origpvsnodes.setsize(0);
+    numwaterplanes = oldnumwaterplanes;
+    loopi(numwaterplanes) waterplanes[i].height = oldwaterplanes[i];
+}
+
+COMMAND(testpvs, "i");
+
+void genpvs(int *viewcellsize)
+{
+    if(worldsize > 1<<15)
+    {
+        conoutf(CON_ERROR, "map is too large for PVS");
+        return;
+    }
+
+    renderbackground("generating PVS (esc to abort)");
+    genpvs_canceled = false;
+    Uint32 start = SDL_GetTicks();
+
+    renderprogress(0, "finding view cells");
+
+    clearpvs();
+    calcpvsbounds();
+    findwaterplanes();
+
+    pvsnode &root = origpvsnodes.add();
+    memset(root.edges.v, 0xFF, 3);
+    root.flags = 0;
+    root.children = 0;
+    genpvsnodes(worldroot);
+
+    totalviewcells = countviewcells(worldroot, ivec(0, 0, 0), worldsize>>1, *viewcellsize>0 ? *viewcellsize : 32);
+    numviewcells = 0;
+    genpvs_canceled = false;
+    check_genpvs_progress = false;
+    SDL_TimerID timer = 0;
+    int numthreads = pvsthreads > 0 ? pvsthreads : numcpus;
+    if(numthreads<=1) 
+    {
+        pvsworkers.add(new pvsworker);
+        timer = SDL_AddTimer(500, genpvs_timer, NULL);
+    }
+    viewcells = new viewcellnode;
+    genviewcells(*viewcells, worldroot, ivec(0, 0, 0), worldsize>>1, *viewcellsize>0 ? *viewcellsize : 32);
+    if(numthreads<=1)
+    {
+        SDL_RemoveTimer(timer);
+    }
+    else
+    {
+        renderprogress(0, "creating threads");
+        if(!pvsmutex) pvsmutex = SDL_CreateMutex();
+        if(!viewcellmutex) viewcellmutex = SDL_CreateMutex();
+        loopi(numthreads)
+        {
+            pvsworker *w = pvsworkers.add(new pvsworker);
+            w->thread = SDL_CreateThread(pvsworker::run, "pvs worker", w);
+        }
+        show_genpvs_progress(0, 0);
+        while(!genpvs_canceled)
+        {
+            SDL_Delay(500);
+            SDL_LockMutex(viewcellmutex);
+            int unique = pvs.length(), processed = numviewcells, remaining = viewcellrequests.length();
+            SDL_UnlockMutex(viewcellmutex);
+            show_genpvs_progress(unique, processed);
+            if(!remaining) break;
+        }        
+        SDL_LockMutex(viewcellmutex);
+        viewcellrequests.setsize(0);
+        SDL_UnlockMutex(viewcellmutex);
+        loopv(pvsworkers) SDL_WaitThread(pvsworkers[i]->thread, NULL);
+    }
+    pvsworkers.deletecontents();
+
+    origpvsnodes.setsize(0);
+    pvscompress.clear();
+
+    Uint32 end = SDL_GetTicks();
+    if(genpvs_canceled) 
+    {
+        clearpvs();
+        conoutf("genpvs aborted");
+    }
+    else conoutf("generated %d unique view cells totaling %.1f kB and averaging %d B (%.1f seconds)", 
+            pvs.length(), pvsbuf.length()/1024.0f, pvsbuf.length()/max(pvs.length(), 1), (end - start) / 1000.0f);
+}
+
+COMMAND(genpvs, "i");
+
+void pvsstats()
+{
+    conoutf("%d unique view cells totaling %.1f kB and averaging %d B",          
+        pvs.length(), pvsbuf.length()/1024.0f, pvsbuf.length()/max(pvs.length(), 1));
+}
+
+COMMAND(pvsstats, "");
+
+static inline bool pvsoccluded(uchar *buf, const ivec &co, int size, const ivec &bbmin, const ivec &bbmax)
+{
+    uchar leafmask = buf[0];
+    loopoctabox(co, size, bbmin, bbmax)
+    {
+        ivec o(i, co, size);
+        if(leafmask&(1<<i))
+        {
+            uchar leafvalues = buf[1+i];
+            if(!leafvalues || (leafvalues!=0xFF && octaboxoverlap(o, size>>1, bbmin, bbmax)&~leafvalues))
+                return false;
+        }
+        else if(!pvsoccluded(buf+9*buf[1+i], o, size>>1, bbmin, bbmax)) return false;
+    }
+    return true;
+}
+
+static inline bool pvsoccluded(uchar *buf, const ivec &bbmin, const ivec &bbmax)
+{
+    int diff = (bbmin.x^bbmax.x) | (bbmin.y^bbmax.y) | (bbmin.z^bbmax.z);
+    if(diff&~((1<<worldscale)-1)) return false;
+    int scale = worldscale-1;
+    while(!(diff&(1<<scale)))
+    {
+        int i = octastep(bbmin.x, bbmin.y, bbmin.z, scale);
+        scale--;
+        uchar leafmask = buf[0];
+        if(leafmask&(1<<i))
+        {
+            uchar leafvalues = buf[1+i];
+            return leafvalues && (leafvalues==0xFF || !(octaboxoverlap(ivec(bbmin).mask(~((2<<scale)-1)), 1<<scale, bbmin, bbmax)&~leafvalues));
+        }
+        buf += 9*buf[1+i];
+    }
+    return pvsoccluded(buf, ivec(bbmin).mask(~((2<<scale)-1)), 1<<scale, bbmin, bbmax);
+}
+
+bool pvsoccluded(const ivec &bbmin, const ivec &bbmax)
+{
+    return curpvs!=NULL && pvsoccluded(curpvs, bbmin, bbmax);
+}
+
+bool pvsoccludedsphere(const vec &center, float radius)
+{
+    if(curpvs==NULL) return false;
+    ivec bbmin(vec(center).sub(radius)), bbmax(vec(center).add(radius+1));
+    return pvsoccluded(curpvs, bbmin, bbmax);
+}
+
+bool waterpvsoccluded(int height)
+{
+    if(!curwaterpvs) return false;
+    if(lockedpvs)
+    {
+        loopi(MAXWATERPVS) if(lockedwaterplanes[i]==height) return (curwaterpvs&(1<<i))!=0;
+    }
+    else
+    {
+        loopi(numwaterplanes) if(waterplanes[i].height==height) return (curwaterpvs&(1<<i))!=0;
+    }
+    return false;
+}
+
+void saveviewcells(stream *f, viewcellnode &p)
+{
+    f->putchar(p.leafmask);
+    loopi(8)
+    {
+        if(p.leafmask&(1<<i)) f->putlil<int>(p.children[i].pvs);
+        else saveviewcells(f, *p.children[i].node);
+    }
+}
+
+void savepvs(stream *f)
+{
+    uint totallen = pvsbuf.length() | (numwaterplanes>0 ? 0x80000000U : 0);
+    f->putlil<uint>(totallen);
+    if(numwaterplanes>0)
+    {
+        f->putlil<uint>(numwaterplanes);
+        loopi(numwaterplanes)
+        {
+            f->putlil<int>(waterplanes[i].height);
+            if(waterplanes[i].height < 0) break;
+        }
+    }
+    loopv(pvs) f->putlil<ushort>(pvs[i].len);
+    f->write(pvsbuf.getbuf(), pvsbuf.length());
+    saveviewcells(f, *viewcells);
+}
+
+viewcellnode *loadviewcells(stream *f)
+{
+    viewcellnode *p = new viewcellnode;
+    p->leafmask = f->getchar();
+    loopi(8)
+    {
+        if(p->leafmask&(1<<i)) p->children[i].pvs = f->getlil<int>();
+        else p->children[i].node = loadviewcells(f);
+    }
+    return p;
+}
+
+void loadpvs(stream *f, int numpvs)
+{
+    uint totallen = f->getlil<uint>();
+    if(totallen & 0x80000000U)
+    {
+        totallen &= ~0x80000000U;
+        numwaterplanes = f->getlil<uint>();
+        loopi(numwaterplanes) waterplanes[i].height = f->getlil<int>();
+    }
+    int offset = 0;
+    loopi(numpvs)
+    {
+        ushort len = f->getlil<ushort>();
+        pvs.add(pvsdata(offset, len));
+        offset += len;
+    }
+    f->read(pvsbuf.reserve(totallen).buf, totallen);
+    pvsbuf.advance(totallen);
+    viewcells = loadviewcells(f);
+}
+
+int getnumviewcells() { return pvs.length(); }
+