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-rw-r--r--src/engine/octa.cpp1880
1 files changed, 1880 insertions, 0 deletions
diff --git a/src/engine/octa.cpp b/src/engine/octa.cpp
new file mode 100644
index 0000000..e4f0901
--- /dev/null
+++ b/src/engine/octa.cpp
@@ -0,0 +1,1880 @@
+// core world management routines
+
+#include "engine.h"
+
+cube *worldroot = newcubes(F_SOLID);
+int allocnodes = 0;
+
+cubeext *growcubeext(cubeext *old, int maxverts)
+{
+ cubeext *ext = (cubeext *)new uchar[sizeof(cubeext) + maxverts*sizeof(vertinfo)];
+ if(old)
+ {
+ ext->va = old->va;
+ ext->ents = old->ents;
+ ext->tjoints = old->tjoints;
+ }
+ else
+ {
+ ext->va = NULL;
+ ext->ents = NULL;
+ ext->tjoints = -1;
+ }
+ ext->maxverts = maxverts;
+ return ext;
+}
+
+void setcubeext(cube &c, cubeext *ext)
+{
+ cubeext *old = c.ext;
+ if(old == ext) return;
+ c.ext = ext;
+ if(old) delete[] (uchar *)old;
+}
+
+cubeext *newcubeext(cube &c, int maxverts, bool init)
+{
+ if(c.ext && c.ext->maxverts >= maxverts) return c.ext;
+ cubeext *ext = growcubeext(c.ext, maxverts);
+ if(init)
+ {
+ if(c.ext)
+ {
+ memcpy(ext->surfaces, c.ext->surfaces, sizeof(ext->surfaces));
+ memcpy(ext->verts(), c.ext->verts(), c.ext->maxverts*sizeof(vertinfo));
+ }
+ else memset(ext->surfaces, 0, sizeof(ext->surfaces));
+ }
+ setcubeext(c, ext);
+ return ext;
+}
+
+cube *newcubes(uint face, int mat)
+{
+ cube *c = new cube[8];
+ loopi(8)
+ {
+ c->children = NULL;
+ c->ext = NULL;
+ c->visible = 0;
+ c->merged = 0;
+ setfaces(*c, face);
+ loopl(6) c->texture[l] = DEFAULT_GEOM;
+ c->material = mat;
+ c++;
+ }
+ allocnodes++;
+ return c-8;
+}
+
+int familysize(const cube &c)
+{
+ int size = 1;
+ if(c.children) loopi(8) size += familysize(c.children[i]);
+ return size;
+}
+
+void freeocta(cube *c)
+{
+ if(!c) return;
+ loopi(8) discardchildren(c[i]);
+ delete[] c;
+ allocnodes--;
+}
+
+void freecubeext(cube &c)
+{
+ if(c.ext)
+ {
+ delete[] (uchar *)c.ext;
+ c.ext = NULL;
+ }
+}
+
+void discardchildren(cube &c, bool fixtex, int depth)
+{
+ c.material = MAT_AIR;
+ c.visible = 0;
+ c.merged = 0;
+ if(c.ext)
+ {
+ if(c.ext->va) destroyva(c.ext->va);
+ c.ext->va = NULL;
+ c.ext->tjoints = -1;
+ freeoctaentities(c);
+ freecubeext(c);
+ }
+ if(c.children)
+ {
+ uint filled = F_EMPTY;
+ loopi(8)
+ {
+ discardchildren(c.children[i], fixtex, depth+1);
+ filled |= c.children[i].faces[0];
+ }
+ if(fixtex)
+ {
+ loopi(6) c.texture[i] = getmippedtexture(c, i);
+ if(depth > 0 && filled != F_EMPTY) c.faces[0] = F_SOLID;
+ }
+ DELETEA(c.children);
+ allocnodes--;
+ }
+}
+
+void getcubevector(cube &c, int d, int x, int y, int z, ivec &p)
+{
+ ivec v(d, x, y, z);
+
+ loopi(3)
+ p[i] = edgeget(cubeedge(c, i, v[R[i]], v[C[i]]), v[D[i]]);
+}
+
+void setcubevector(cube &c, int d, int x, int y, int z, const ivec &p)
+{
+ ivec v(d, x, y, z);
+
+ loopi(3)
+ edgeset(cubeedge(c, i, v[R[i]], v[C[i]]), v[D[i]], p[i]);
+}
+
+static inline void getcubevector(cube &c, int i, ivec &p)
+{
+ p.x = edgeget(cubeedge(c, 0, (i>>R[0])&1, (i>>C[0])&1), (i>>D[0])&1);
+ p.y = edgeget(cubeedge(c, 1, (i>>R[1])&1, (i>>C[1])&1), (i>>D[1])&1);
+ p.z = edgeget(cubeedge(c, 2, (i>>R[2])&1, (i>>C[2])&1), (i>>D[2])&1);
+}
+
+static inline void setcubevector(cube &c, int i, const ivec &p)
+{
+ edgeset(cubeedge(c, 0, (i>>R[0])&1, (i>>C[0])&1), (i>>D[0])&1, p.x);
+ edgeset(cubeedge(c, 1, (i>>R[1])&1, (i>>C[1])&1), (i>>D[1])&1, p.y);
+ edgeset(cubeedge(c, 2, (i>>R[2])&1, (i>>C[2])&1), (i>>D[2])&1, p.z);
+}
+
+void optiface(uchar *p, cube &c)
+{
+ uint f = *(uint *)p;
+ if(((f>>4)&0x0F0F0F0FU) == (f&0x0F0F0F0FU)) emptyfaces(c);
+}
+
+void printcube()
+{
+ cube &c = lookupcube(lu); // assume this is cube being pointed at
+ conoutf(CON_DEBUG, "= %p = (%d, %d, %d) @ %d", (void *)&c, lu.x, lu.y, lu.z, lusize);
+ conoutf(CON_DEBUG, " x %.8x", c.faces[0]);
+ conoutf(CON_DEBUG, " y %.8x", c.faces[1]);
+ conoutf(CON_DEBUG, " z %.8x", c.faces[2]);
+}
+
+COMMAND(printcube, "");
+
+bool isvalidcube(const cube &c)
+{
+ clipplanes p;
+ genclipplanes(c, ivec(0, 0, 0), 256, p);
+ loopi(8) // test that cube is convex
+ {
+ vec v = p.v[i];
+ loopj(p.size) if(p.p[j].dist(v)>1e-3f) return false;
+ }
+ return true;
+}
+
+void validatec(cube *c, int size)
+{
+ loopi(8)
+ {
+ if(c[i].children)
+ {
+ if(size<=1)
+ {
+ solidfaces(c[i]);
+ discardchildren(c[i], true);
+ }
+ else validatec(c[i].children, size>>1);
+ }
+ else if(size > 0x1000)
+ {
+ subdividecube(c[i], true, false);
+ validatec(c[i].children, size>>1);
+ }
+ else
+ {
+ loopj(3)
+ {
+ uint f = c[i].faces[j], e0 = f&0x0F0F0F0FU, e1 = (f>>4)&0x0F0F0F0FU;
+ if(e0 == e1 || ((e1+0x07070707U)|(e1-e0))&0xF0F0F0F0U)
+ {
+ emptyfaces(c[i]);
+ break;
+ }
+ }
+ }
+ }
+}
+
+ivec lu;
+int lusize;
+cube &lookupcube(const ivec &to, int tsize, ivec &ro, int &rsize)
+{
+ int tx = clamp(to.x, 0, worldsize-1),
+ ty = clamp(to.y, 0, worldsize-1),
+ tz = clamp(to.z, 0, worldsize-1);
+ int scale = worldscale-1, csize = abs(tsize);
+ cube *c = &worldroot[octastep(tx, ty, tz, scale)];
+ if(!(csize>>scale)) do
+ {
+ if(!c->children)
+ {
+ if(tsize > 0) do
+ {
+ subdividecube(*c);
+ scale--;
+ c = &c->children[octastep(tx, ty, tz, scale)];
+ } while(!(csize>>scale));
+ break;
+ }
+ scale--;
+ c = &c->children[octastep(tx, ty, tz, scale)];
+ } while(!(csize>>scale));
+ ro = ivec(tx, ty, tz).mask(~0U<<scale);
+ rsize = 1<<scale;
+ return *c;
+}
+
+int lookupmaterial(const vec &v)
+{
+ ivec o(v);
+ if(!insideworld(o)) return MAT_AIR;
+ int scale = worldscale-1;
+ cube *c = &worldroot[octastep(o.x, o.y, o.z, scale)];
+ while(c->children)
+ {
+ scale--;
+ c = &c->children[octastep(o.x, o.y, o.z, scale)];
+ }
+ return c->material;
+}
+
+const cube *neighbourstack[32];
+int neighbourdepth = -1;
+
+const cube &neighbourcube(const cube &c, int orient, const ivec &co, int size, ivec &ro, int &rsize)
+{
+ ivec n = co;
+ int dim = dimension(orient);
+ uint diff = n[dim];
+ if(dimcoord(orient)) n[dim] += size; else n[dim] -= size;
+ diff ^= n[dim];
+ if(diff >= uint(worldsize)) { ro = n; rsize = size; return c; }
+ int scale = worldscale;
+ const cube *nc = worldroot;
+ if(neighbourdepth >= 0)
+ {
+ scale -= neighbourdepth + 1;
+ diff >>= scale;
+ do { scale++; diff >>= 1; } while(diff);
+ nc = neighbourstack[worldscale - scale];
+ }
+ scale--;
+ nc = &nc[octastep(n.x, n.y, n.z, scale)];
+ if(!(size>>scale) && nc->children) do
+ {
+ scale--;
+ nc = &nc->children[octastep(n.x, n.y, n.z, scale)];
+ } while(!(size>>scale) && nc->children);
+ ro = n.mask(~0U<<scale);
+ rsize = 1<<scale;
+ return *nc;
+}
+
+////////// (re)mip //////////
+
+int getmippedtexture(const cube &p, int orient)
+{
+ cube *c = p.children;
+ int d = dimension(orient), dc = dimcoord(orient), texs[4] = { -1, -1, -1, -1 }, numtexs = 0;
+ loop(x, 2) loop(y, 2)
+ {
+ int n = octaindex(d, x, y, dc);
+ if(isempty(c[n]))
+ {
+ n = oppositeocta(d, n);
+ if(isempty(c[n]))
+ continue;
+ }
+ int tex = c[n].texture[orient];
+ if(tex > DEFAULT_SKY) loopi(numtexs) if(texs[i] == tex) return tex;
+ texs[numtexs++] = tex;
+ }
+ loopirev(numtexs) if(!i || texs[i] > DEFAULT_SKY) return texs[i];
+ return DEFAULT_GEOM;
+}
+
+void forcemip(cube &c, bool fixtex)
+{
+ cube *ch = c.children;
+ emptyfaces(c);
+
+ loopi(8) loopj(8)
+ {
+ int n = i^(j==3 ? 4 : (j==4 ? 3 : j));
+ if(!isempty(ch[n])) // breadth first search for cube near vert
+ {
+ ivec v;
+ getcubevector(ch[n], i, v);
+ // adjust vert to parent size
+ setcubevector(c, i, ivec(n, v, 8).shr(1));
+ break;
+ }
+ }
+
+ if(fixtex) loopj(6)
+ c.texture[j] = getmippedtexture(c, j);
+}
+
+static int midedge(const ivec &a, const ivec &b, int xd, int yd, bool &perfect)
+{
+ int ax = a[xd], ay = a[yd], bx = b[xd], by = b[yd];
+ if(ay==by) return ay;
+ if(ax==bx) { perfect = false; return ay; }
+ bool crossx = (ax<8 && bx>8) || (ax>8 && bx<8);
+ bool crossy = (ay<8 && by>8) || (ay>8 && by<8);
+ if(crossy && !crossx) { midedge(a,b,yd,xd,perfect); return 8; } // to test perfection
+ if(ax<=8 && bx<=8) return ax>bx ? ay : by;
+ if(ax>=8 && bx>=8) return ax<bx ? ay : by;
+ int risex = (by-ay)*(8-ax)*256;
+ int s = risex/(bx-ax);
+ int y = s/256 + ay;
+ if(((abs(s)&0xFF)!=0) || // ie: rounding error
+ (crossy && y!=8) ||
+ (y<0 || y>16)) perfect = false;
+ return crossy ? 8 : min(max(y, 0), 16);
+}
+
+static inline bool crosscenter(const ivec &a, const ivec &b, int xd, int yd)
+{
+ int ax = a[xd], ay = a[yd], bx = b[xd], by = b[yd];
+ return (((ax <= 8 && bx <= 8) || (ax >= 8 && bx >= 8)) &&
+ ((ay <= 8 && by <= 8) || (ay >= 8 && by >= 8))) ||
+ (ax + bx == 16 && ay + by == 16);
+}
+
+bool subdividecube(cube &c, bool fullcheck, bool brighten)
+{
+ if(c.children) return true;
+ if(c.ext) memset(c.ext->surfaces, 0, sizeof(c.ext->surfaces));
+ if(isempty(c) || isentirelysolid(c))
+ {
+ c.children = newcubes(isempty(c) ? F_EMPTY : F_SOLID, c.material);
+ loopi(8)
+ {
+ loopl(6) c.children[i].texture[l] = c.texture[l];
+ if(brighten && !isempty(c)) brightencube(c.children[i]);
+ }
+ return true;
+ }
+ cube *ch = c.children = newcubes(F_SOLID, c.material);
+ bool perfect = true;
+ ivec v[8];
+ loopi(8)
+ {
+ getcubevector(c, i, v[i]);
+ v[i].mul(2);
+ }
+
+ loopj(6)
+ {
+ int d = dimension(j), z = dimcoord(j);
+ const ivec &v00 = v[octaindex(d, 0, 0, z)],
+ &v10 = v[octaindex(d, 1, 0, z)],
+ &v01 = v[octaindex(d, 0, 1, z)],
+ &v11 = v[octaindex(d, 1, 1, z)];
+ int e[3][3];
+ // corners
+ e[0][0] = v00[d];
+ e[0][2] = v01[d];
+ e[2][0] = v10[d];
+ e[2][2] = v11[d];
+ // edges
+ e[0][1] = midedge(v00, v01, C[d], d, perfect);
+ e[1][0] = midedge(v00, v10, R[d], d, perfect);
+ e[1][2] = midedge(v11, v01, R[d], d, perfect);
+ e[2][1] = midedge(v11, v10, C[d], d, perfect);
+ // center
+ bool p1 = perfect, p2 = perfect;
+ int c1 = midedge(v00, v11, R[d], d, p1);
+ int c2 = midedge(v01, v10, R[d], d, p2);
+ if(z ? c1 > c2 : c1 < c2)
+ {
+ e[1][1] = c1;
+ perfect = p1 && (c1 == c2 || crosscenter(v00, v11, C[d], R[d]));
+ }
+ else
+ {
+ e[1][1] = c2;
+ perfect = p2 && (c1 == c2 || crosscenter(v01, v10, C[d], R[d]));
+ }
+
+ loopi(8)
+ {
+ ch[i].texture[j] = c.texture[j];
+ int rd = (i>>R[d])&1, cd = (i>>C[d])&1, dd = (i>>D[d])&1;
+ edgeset(cubeedge(ch[i], d, 0, 0), z, clamp(e[rd][cd] - dd*8, 0, 8));
+ edgeset(cubeedge(ch[i], d, 1, 0), z, clamp(e[1+rd][cd] - dd*8, 0, 8));
+ edgeset(cubeedge(ch[i], d, 0, 1), z, clamp(e[rd][1+cd] - dd*8, 0, 8));
+ edgeset(cubeedge(ch[i], d, 1, 1), z, clamp(e[1+rd][1+cd] - dd*8, 0, 8));
+ }
+ }
+
+ validatec(ch);
+ if(fullcheck) loopi(8) if(!isvalidcube(ch[i])) // not so good...
+ {
+ emptyfaces(ch[i]);
+ perfect=false;
+ }
+ if(brighten) loopi(8) if(!isempty(ch[i])) brightencube(ch[i]);
+ return perfect;
+}
+
+bool crushededge(uchar e, int dc) { return dc ? e==0 : e==0x88; }
+
+int visibleorient(const cube &c, int orient)
+{
+ loopi(2)
+ {
+ int a = faceedgesidx[orient][i*2 + 0];
+ int b = faceedgesidx[orient][i*2 + 1];
+ loopj(2)
+ {
+ if(crushededge(c.edges[a],j) &&
+ crushededge(c.edges[b],j) &&
+ touchingface(c, orient)) return ((a>>2)<<1) + j;
+ }
+ }
+ return orient;
+}
+
+VAR(mipvis, 0, 0, 1);
+
+static int remipprogress = 0, remiptotal = 0;
+
+bool remip(cube &c, const ivec &co, int size)
+{
+ cube *ch = c.children;
+ if(!ch)
+ {
+ if(size<<1 <= 0x1000) return true;
+ subdividecube(c);
+ ch = c.children;
+ }
+ else if((remipprogress++&0xFFF)==1) renderprogress(float(remipprogress)/remiptotal, "remipping...");
+
+ bool perfect = true;
+ loopi(8)
+ {
+ ivec o(i, co, size);
+ if(!remip(ch[i], o, size>>1)) perfect = false;
+ }
+
+ solidfaces(c); // so texmip is more consistent
+ loopj(6)
+ c.texture[j] = getmippedtexture(c, j); // parents get child texs regardless
+
+ if(!perfect) return false;
+ if(size<<1 > 0x1000) return false;
+
+ ushort mat = MAT_AIR;
+ loopi(8)
+ {
+ mat = ch[i].material;
+ if((mat&MATF_CLIP) == MAT_NOCLIP || mat&MAT_ALPHA)
+ {
+ if(i > 0) return false;
+ while(++i < 8) if(ch[i].material != mat) return false;
+ break;
+ }
+ else if(!isentirelysolid(ch[i]))
+ {
+ while(++i < 8)
+ {
+ int omat = ch[i].material;
+ if(isentirelysolid(ch[i]) ? (omat&MATF_CLIP) == MAT_NOCLIP || omat&MAT_ALPHA : mat != omat) return false;
+ }
+ break;
+ }
+ }
+
+ cube n = c;
+ n.ext = NULL;
+ forcemip(n);
+ n.children = NULL;
+ if(!subdividecube(n, false, false))
+ { freeocta(n.children); return false; }
+
+ cube *nh = n.children;
+ uchar vis[6] = {0, 0, 0, 0, 0, 0};
+ loopi(8)
+ {
+ if(ch[i].faces[0] != nh[i].faces[0] ||
+ ch[i].faces[1] != nh[i].faces[1] ||
+ ch[i].faces[2] != nh[i].faces[2])
+ { freeocta(nh); return false; }
+
+ if(isempty(ch[i]) && isempty(nh[i])) continue;
+
+ ivec o(i, co, size);
+ loop(orient, 6)
+ if(visibleface(ch[i], orient, o, size, MAT_AIR, (mat&MAT_ALPHA)^MAT_ALPHA, MAT_ALPHA))
+ {
+ if(ch[i].texture[orient] != n.texture[orient]) { freeocta(nh); return false; }
+ vis[orient] |= 1<<i;
+ }
+ }
+ if(mipvis) loop(orient, 6)
+ {
+ int mask = 0;
+ loop(x, 2) loop(y, 2) mask |= 1<<octaindex(dimension(orient), x, y, dimcoord(orient));
+ if(vis[orient]&mask && (vis[orient]&mask)!=mask) { freeocta(nh); return false; }
+ }
+
+ freeocta(nh);
+ discardchildren(c);
+ loopi(3) c.faces[i] = n.faces[i];
+ c.material = mat;
+ loopi(6) if(vis[i]) c.visible |= 1<<i;
+ if(c.visible) c.visible |= 0x40;
+ brightencube(c);
+ return true;
+}
+
+void mpremip(bool local)
+{
+ extern selinfo sel;
+ if(local) game::edittrigger(sel, EDIT_REMIP);
+ remipprogress = 1;
+ remiptotal = allocnodes;
+ loopi(8)
+ {
+ ivec o(i, ivec(0, 0, 0), worldsize>>1);
+ remip(worldroot[i], o, worldsize>>2);
+ }
+ calcmerges();
+ if(!local) allchanged();
+}
+
+void remip_()
+{
+ mpremip(true);
+ allchanged();
+}
+
+COMMANDN(remip, remip_, "");
+
+static inline int edgeval(cube &c, const ivec &p, int dim, int coord)
+{
+ return edgeget(cubeedge(c, dim, p[R[dim]]>>3, p[C[dim]]>>3), coord);
+}
+
+void genvertp(cube &c, ivec &p1, ivec &p2, ivec &p3, plane &pl, bool solid = false)
+{
+ int dim = 0;
+ if(p1.y==p2.y && p2.y==p3.y) dim = 1;
+ else if(p1.z==p2.z && p2.z==p3.z) dim = 2;
+
+ int coord = p1[dim];
+ ivec v1(p1), v2(p2), v3(p3);
+ v1[dim] = solid ? coord*8 : edgeval(c, p1, dim, coord);
+ v2[dim] = solid ? coord*8 : edgeval(c, p2, dim, coord);
+ v3[dim] = solid ? coord*8 : edgeval(c, p3, dim, coord);
+
+ pl.toplane(vec(v1), vec(v2), vec(v3));
+}
+
+static bool threeplaneintersect(plane &pl1, plane &pl2, plane &pl3, vec &dest)
+{
+ vec &t1 = dest, t2, t3, t4;
+ t1.cross(pl1, pl2); t4 = t1; t1.mul(pl3.offset);
+ t2.cross(pl3, pl1); t2.mul(pl2.offset);
+ t3.cross(pl2, pl3); t3.mul(pl1.offset);
+ t1.add(t2);
+ t1.add(t3);
+ t1.mul(-1);
+ float d = t4.dot(pl3);
+ if(d==0) return false;
+ t1.div(d);
+ return true;
+}
+
+static void genedgespanvert(ivec &p, cube &c, vec &v)
+{
+ ivec p1(8-p.x, p.y, p.z);
+ ivec p2(p.x, 8-p.y, p.z);
+ ivec p3(p.x, p.y, 8-p.z);
+
+ plane plane1, plane2, plane3;
+ genvertp(c, p, p1, p2, plane1);
+ genvertp(c, p, p2, p3, plane2);
+ genvertp(c, p, p3, p1, plane3);
+ if(plane1==plane2) genvertp(c, p, p1, p2, plane1, true);
+ if(plane1==plane3) genvertp(c, p, p1, p2, plane1, true);
+ if(plane2==plane3) genvertp(c, p, p2, p3, plane2, true);
+
+ ASSERT(threeplaneintersect(plane1, plane2, plane3, v));
+ //ASSERT(v.x>=0 && v.x<=8);
+ //ASSERT(v.y>=0 && v.y<=8);
+ //ASSERT(v.z>=0 && v.z<=8);
+ v.x = max(0.0f, min(8.0f, v.x));
+ v.y = max(0.0f, min(8.0f, v.y));
+ v.z = max(0.0f, min(8.0f, v.z));
+}
+
+void edgespan2vectorcube(cube &c)
+{
+ if(isentirelysolid(c) || isempty(c)) return;
+ cube o = c;
+ loop(x, 2) loop(y, 2) loop(z, 2)
+ {
+ ivec p(8*x, 8*y, 8*z);
+ vec v;
+ genedgespanvert(p, o, v);
+
+ edgeset(cubeedge(c, 0, y, z), x, int(v.x+0.49f));
+ edgeset(cubeedge(c, 1, z, x), y, int(v.y+0.49f));
+ edgeset(cubeedge(c, 2, x, y), z, int(v.z+0.49f));
+ }
+}
+
+const ivec cubecoords[8] = // verts of bounding cube
+{
+#define GENCUBEVERT(n, x, y, z) ivec(x, y, z),
+ GENCUBEVERTS(0, 8, 0, 8, 0, 8)
+#undef GENCUBEVERT
+};
+
+template<class T>
+static inline void gencubevert(const cube &c, int i, T &v)
+{
+ switch(i)
+ {
+ default:
+#define GENCUBEVERT(n, x, y, z) \
+ case n: \
+ v = T(edgeget(cubeedge(c, 0, y, z), x), \
+ edgeget(cubeedge(c, 1, z, x), y), \
+ edgeget(cubeedge(c, 2, x, y), z)); \
+ break;
+ GENCUBEVERTS(0, 1, 0, 1, 0, 1)
+#undef GENCUBEVERT
+ }
+}
+
+void genfaceverts(const cube &c, int orient, ivec v[4])
+{
+ switch(orient)
+ {
+ default:
+#define GENFACEORIENT(o, v0, v1, v2, v3) \
+ case o: v0 v1 v2 v3 break;
+#define GENFACEVERT(o, n, x,y,z, xv,yv,zv) \
+ v[n] = ivec(edgeget(cubeedge(c, 0, y, z), x), \
+ edgeget(cubeedge(c, 1, z, x), y), \
+ edgeget(cubeedge(c, 2, x, y), z));
+ GENFACEVERTS(0, 1, 0, 1, 0, 1, , , , , , )
+ #undef GENFACEORIENT
+ #undef GENFACEVERT
+ }
+}
+
+const ivec facecoords[6][4] =
+{
+#define GENFACEORIENT(o, v0, v1, v2, v3) \
+ { v0, v1, v2, v3 },
+#define GENFACEVERT(o, n, x,y,z, xv,yv,zv) \
+ ivec(x,y,z)
+ GENFACEVERTS(0, 8, 0, 8, 0, 8, , , , , , )
+#undef GENFACEORIENT
+#undef GENFACEVERT
+};
+
+const uchar fv[6][4] = // indexes for cubecoords, per each vert of a face orientation
+{
+ { 2, 1, 6, 5 },
+ { 3, 4, 7, 0 },
+ { 4, 5, 6, 7 },
+ { 1, 2, 3, 0 },
+ { 6, 1, 0, 7 },
+ { 5, 4, 3, 2 },
+};
+
+const uchar fvmasks[64] = // mask of verts used given a mask of visible face orientations
+{
+ 0x00, 0x66, 0x99, 0xFF, 0xF0, 0xF6, 0xF9, 0xFF,
+ 0x0F, 0x6F, 0x9F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xC3, 0xE7, 0xDB, 0xFF, 0xF3, 0xF7, 0xFB, 0xFF,
+ 0xCF, 0xEF, 0xDF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0x3C, 0x7E, 0xBD, 0xFF, 0xFC, 0xFE, 0xFD, 0xFF,
+ 0x3F, 0x7F, 0xBF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+};
+
+const uchar faceedgesidx[6][4] = // ordered edges surrounding each orient
+{//0..1 = row edges, 2..3 = column edges
+ { 4, 5, 8, 10 },
+ { 6, 7, 9, 11 },
+ { 8, 9, 0, 2 },
+ { 10, 11, 1, 3 },
+ { 0, 1, 4, 6 },
+ { 2, 3, 5, 7 },
+};
+
+bool flataxisface(const cube &c, int orient)
+{
+ uint face = c.faces[dimension(orient)];
+ if(dimcoord(orient)) face >>= 4;
+ return (face&0x0F0F0F0F) == 0x01010101*(face&0x0F);
+}
+
+bool collideface(const cube &c, int orient)
+{
+ if(flataxisface(c, orient))
+ {
+ uchar r1 = c.edges[faceedgesidx[orient][0]], r2 = c.edges[faceedgesidx[orient][1]];
+ if(uchar((r1>>4)|(r2&0xF0)) == uchar((r1&0x0F)|(r2<<4))) return false;
+ uchar c1 = c.edges[faceedgesidx[orient][2]], c2 = c.edges[faceedgesidx[orient][3]];
+ if(uchar((c1>>4)|(c2&0xF0)) == uchar((c1&0x0F)|(c2<<4))) return false;
+ }
+ return true;
+}
+
+bool touchingface(const cube &c, int orient)
+{
+ uint face = c.faces[dimension(orient)];
+ return dimcoord(orient) ? (face&0xF0F0F0F0)==0x80808080 : (face&0x0F0F0F0F)==0;
+}
+
+bool notouchingface(const cube &c, int orient)
+{
+ uint face = c.faces[dimension(orient)];
+ return dimcoord(orient) ? (face&0x80808080)==0 : ((0x88888888-face)&0x08080808) == 0;
+}
+
+int faceconvexity(const ivec v[4])
+{
+ ivec n;
+ n.cross(ivec(v[1]).sub(v[0]), ivec(v[2]).sub(v[0]));
+ return ivec(v[0]).sub(v[3]).dot(n);
+ // 1 if convex, -1 if concave, 0 if flat
+}
+
+int faceconvexity(const vertinfo *verts, int numverts, int size)
+{
+ if(numverts < 4) return 0;
+ ivec v0 = verts[0].getxyz(),
+ e1 = verts[1].getxyz().sub(v0),
+ e2 = verts[2].getxyz().sub(v0),
+ n;
+ if(size >= (8<<5))
+ {
+ if(size >= (8<<10)) n.cross(e1.shr(10), e2.shr(10));
+ else n.cross(e1, e2).shr(10);
+ }
+ else n.cross(e1, e2);
+ return verts[3].getxyz().sub(v0).dot(n);
+}
+
+int faceconvexity(const ivec v[4], int &vis)
+{
+ ivec e1, e2, e3, n;
+ n.cross((e1 = v[1]).sub(v[0]), (e2 = v[2]).sub(v[0]));
+ int convex = (e3 = v[0]).sub(v[3]).dot(n);
+ if(!convex)
+ {
+ if(ivec().cross(e3, e2).iszero()) { if(!n.iszero()) vis = 1; }
+ else if(n.iszero()) { vis = 2; }
+ return 0;
+ }
+ return convex;
+}
+
+int faceconvexity(const cube &c, int orient)
+{
+ if(flataxisface(c, orient)) return 0;
+ ivec v[4];
+ genfaceverts(c, orient, v);
+ return faceconvexity(v);
+}
+
+int faceorder(const cube &c, int orient) // gets above 'fv' so that each face is convex
+{
+ return faceconvexity(c, orient)<0 ? 1 : 0;
+}
+
+static inline void faceedges(const cube &c, int orient, uchar edges[4])
+{
+ loopk(4) edges[k] = c.edges[faceedgesidx[orient][k]];
+}
+
+uint faceedges(const cube &c, int orient)
+{
+ union { uchar edges[4]; uint face; } u;
+ faceedges(c, orient, u.edges);
+ return u.face;
+}
+
+static inline int genfacevecs(const cube &cu, int orient, const ivec &pos, int size, bool solid, ivec2 *fvecs, const ivec *v = NULL)
+{
+ int i = 0;
+ if(solid)
+ {
+ switch(orient)
+ {
+ #define GENFACEORIENT(orient, v0, v1, v2, v3) \
+ case orient: \
+ { \
+ if(dimcoord(orient)) { v0 v1 v2 v3 } else { v3 v2 v1 v0 } \
+ break; \
+ }
+ #define GENFACEVERT(orient, vert, xv,yv,zv, x,y,z) \
+ { ivec2 &f = fvecs[i]; x ((xv)<<3); y ((yv)<<3); z ((zv)<<3); i++; }
+ GENFACEVERTS(pos.x, pos.x+size, pos.y, pos.y+size, pos.z, pos.z+size, f.x = , f.x = , f.y = , f.y = , (void), (void))
+ #undef GENFACEVERT
+ }
+ return 4;
+ }
+ ivec buf[4];
+ if(!v) { genfaceverts(cu, orient, buf); v = buf; }
+ ivec2 prev(INT_MAX, INT_MAX);
+ switch(orient)
+ {
+ #define GENFACEVERT(orient, vert, sx,sy,sz, dx,dy,dz) \
+ { \
+ const ivec &e = v[vert]; \
+ ivec ef; \
+ ef.dx = e.sx; ef.dy = e.sy; ef.dz = e.sz; \
+ if(ef.z == dimcoord(orient)*8) \
+ { \
+ ivec2 &f = fvecs[i]; \
+ ivec pf; \
+ pf.dx = pos.sx; pf.dy = pos.sy; pf.dz = pos.sz; \
+ f = ivec2(ef.x*size + (pf.x<<3), ef.y*size + (pf.y<<3)); \
+ if(f != prev) { prev = f; i++; } \
+ } \
+ }
+ GENFACEVERTS(x, x, y, y, z, z, x, x, y, y, z, z)
+ #undef GENFACEORIENT
+ #undef GENFACEVERT
+ }
+ if(fvecs[0] == prev) i--;
+ return i;
+}
+
+static inline int clipfacevecy(const ivec2 &o, const ivec2 &dir, int cx, int cy, int size, ivec2 &r)
+{
+ if(dir.x >= 0)
+ {
+ if(cx <= o.x || cx >= o.x+dir.x) return 0;
+ }
+ else if(cx <= o.x+dir.x || cx >= o.x) return 0;
+
+ int t = (o.y-cy) + (cx-o.x)*dir.y/dir.x;
+ if(t <= 0 || t >= size) return 0;
+
+ r.x = cx;
+ r.y = cy + t;
+ return 1;
+}
+
+static inline int clipfacevecx(const ivec2 &o, const ivec2 &dir, int cx, int cy, int size, ivec2 &r)
+{
+ if(dir.y >= 0)
+ {
+ if(cy <= o.y || cy >= o.y+dir.y) return 0;
+ }
+ else if(cy <= o.y+dir.y || cy >= o.y) return 0;
+
+ int t = (o.x-cx) + (cy-o.y)*dir.x/dir.y;
+ if(t <= 0 || t >= size) return 0;
+
+ r.x = cx + t;
+ r.y = cy;
+ return 1;
+}
+
+static inline int clipfacevec(const ivec2 &o, const ivec2 &dir, int cx, int cy, int size, ivec2 *rvecs)
+{
+ int r = 0;
+
+ if(o.x >= cx && o.x <= cx+size &&
+ o.y >= cy && o.y <= cy+size &&
+ ((o.x != cx && o.x != cx+size) || (o.y != cy && o.y != cy+size)))
+ {
+ rvecs[0].x = o.x;
+ rvecs[0].y = o.y;
+ r++;
+ }
+
+ r += clipfacevecx(o, dir, cx, cy, size, rvecs[r]);
+ r += clipfacevecx(o, dir, cx, cy+size, size, rvecs[r]);
+ r += clipfacevecy(o, dir, cx, cy, size, rvecs[r]);
+ r += clipfacevecy(o, dir, cx+size, cy, size, rvecs[r]);
+
+ ASSERT(r <= 2);
+ return r;
+}
+
+static inline bool insideface(const ivec2 *p, int nump, const ivec2 *o, int numo)
+{
+ int bounds = 0;
+ ivec2 prev = o[numo-1];
+ loopi(numo)
+ {
+ const ivec2 &cur = o[i];
+ ivec2 dir(cur.x-prev.x, cur.y-prev.y);
+ int offset = dir.x*prev.y - dir.y*prev.x;
+ loopj(nump) if(dir.x*p[j].y - dir.y*p[j].x > offset) return false;
+ bounds++;
+ prev = cur;
+ }
+ return bounds>=3;
+}
+
+static inline int clipfacevecs(const ivec2 *o, int numo, int cx, int cy, int size, ivec2 *rvecs)
+{
+ cx <<= 3;
+ cy <<= 3;
+ size <<= 3;
+
+ int r = 0;
+ ivec2 prev = o[numo-1];
+ loopi(numo)
+ {
+ const ivec2 &cur = o[i];
+ r += clipfacevec(prev, ivec2(cur.x-prev.x, cur.y-prev.y), cx, cy, size, &rvecs[r]);
+ prev = cur;
+ }
+ ivec2 corner[4] = {ivec2(cx, cy), ivec2(cx+size, cy), ivec2(cx+size, cy+size), ivec2(cx, cy+size)};
+ loopi(4) if(insideface(&corner[i], 1, o, numo)) rvecs[r++] = corner[i];
+ ASSERT(r <= 8);
+ return r;
+}
+
+bool collapsedface(const cube &c, int orient)
+{
+ int e0 = c.edges[faceedgesidx[orient][0]], e1 = c.edges[faceedgesidx[orient][1]],
+ e2 = c.edges[faceedgesidx[orient][2]], e3 = c.edges[faceedgesidx[orient][3]],
+ face = dimension(orient)*4,
+ f0 = c.edges[face+0], f1 = c.edges[face+1],
+ f2 = c.edges[face+2], f3 = c.edges[face+3];
+ if(dimcoord(orient)) { f0 >>= 4; f1 >>= 4; f2 >>= 4; f3 >>= 4; }
+ else { f0 &= 0xF; f1 &= 0xF; f2 &= 0xF; f3 &= 0xF; }
+ ivec v0(e0&0xF, e2&0xF, f0),
+ v1(e0>>4, e3&0xF, f1),
+ v2(e1>>4, e3>>4, f3),
+ v3(e1&0xF, e2>>4, f2);
+ return ivec().cross(v1.sub(v0), v2.sub(v0)).iszero() &&
+ ivec().cross(v2, v3.sub(v0)).iszero();
+}
+
+static inline bool occludesface(const cube &c, int orient, const ivec &o, int size, const ivec &vo, int vsize, ushort vmat, ushort nmat, ushort matmask, const ivec2 *vf, int numv)
+{
+ int dim = dimension(orient);
+ if(!c.children)
+ {
+ if(nmat != MAT_AIR && (c.material&matmask) == nmat)
+ {
+ ivec2 nf[8];
+ return clipfacevecs(vf, numv, o[C[dim]], o[R[dim]], size, nf) < 3;
+ }
+ if(isentirelysolid(c)) return true;
+ if(vmat != MAT_AIR && ((c.material&matmask) == vmat || (isliquid(vmat) && isclipped(c.material&MATF_VOLUME)))) return true;
+ if(touchingface(c, orient) && faceedges(c, orient) == F_SOLID) return true;
+ ivec2 cf[8];
+ int numc = clipfacevecs(vf, numv, o[C[dim]], o[R[dim]], size, cf);
+ if(numc < 3) return true;
+ if(isempty(c) || notouchingface(c, orient)) return false;
+ ivec2 of[4];
+ int numo = genfacevecs(c, orient, o, size, false, of);
+ return numo >= 3 && insideface(cf, numc, of, numo);
+ }
+
+ size >>= 1;
+ int coord = dimcoord(orient);
+ loopi(8) if(octacoord(dim, i) == coord)
+ {
+ if(!occludesface(c.children[i], orient, ivec(i, o, size), size, vo, vsize, vmat, nmat, matmask, vf, numv)) return false;
+ }
+
+ return true;
+}
+
+bool visibleface(const cube &c, int orient, const ivec &co, int size, ushort mat, ushort nmat, ushort matmask)
+{
+ if(mat != MAT_AIR)
+ {
+ if(faceedges(c, orient)==F_SOLID && touchingface(c, orient)) return false;
+ }
+ else
+ {
+ if(collapsedface(c, orient)) return false;
+ if(!touchingface(c, orient)) return true;
+ }
+
+ ivec no;
+ int nsize;
+ const cube &o = neighbourcube(c, orient, co, size, no, nsize);
+ if(&o==&c) return false;
+
+ int opp = opposite(orient);
+ if(nsize > size || (nsize == size && !o.children))
+ {
+ if(nmat != MAT_AIR && (o.material&matmask) == nmat) return true;
+ if(isentirelysolid(o)) return false;
+ if(mat != MAT_AIR && ((o.material&matmask) == mat || (isliquid(mat) && (o.material&MATF_VOLUME) == MAT_GLASS))) return false;
+ if(isempty(o) || notouchingface(o, opp)) return true;
+ if(touchingface(o, opp) && faceedges(o, opp) == F_SOLID) return false;
+
+ ivec vo = ivec(co).mask(0xFFF);
+ no.mask(0xFFF);
+ ivec2 cf[4], of[4];
+ int numc = genfacevecs(c, orient, vo, size, mat != MAT_AIR, cf),
+ numo = genfacevecs(o, opp, no, nsize, false, of);
+ return numo < 3 || !insideface(cf, numc, of, numo);
+ }
+
+
+ ivec vo = ivec(co).mask(0xFFF);
+ no.mask(0xFFF);
+ ivec2 cf[4];
+ int numc = genfacevecs(c, orient, vo, size, mat != MAT_AIR, cf);
+ return !occludesface(o, opp, no, nsize, vo, size, mat, nmat, matmask, cf, numc);
+}
+
+int classifyface(const cube &c, int orient, const ivec &co, int size)
+{
+ if(collapsedface(c, orient)) return 0;
+ int vismask = (c.material&MATF_CLIP) == MAT_NOCLIP ? 1 : 3;
+ if(!touchingface(c, orient)) return vismask;
+
+ ivec no;
+ int nsize;
+ const cube &o = neighbourcube(c, orient, co, size, no, nsize);
+ if(&o==&c) return 0;
+
+ int vis = 0, opp = opposite(orient);
+ if(nsize > size || (nsize == size && !o.children))
+ {
+ if((~c.material & o.material) & MAT_ALPHA) vis |= 1;
+ if((o.material&MATF_CLIP) == MAT_NOCLIP) vis |= vismask&2;
+ if(vis == vismask || isentirelysolid(o)) return vis;
+ if(isempty(o) || notouchingface(o, opp)) return vismask;
+ if(touchingface(o, opp) && faceedges(o, opp) == F_SOLID) return vis;
+
+ ivec vo = ivec(co).mask(0xFFF);
+ no.mask(0xFFF);
+ ivec2 cf[4], of[4];
+ int numc = genfacevecs(c, orient, vo, size, false, cf),
+ numo = genfacevecs(o, opp, no, nsize, false, of);
+ if(numo < 3 || !insideface(cf, numc, of, numo)) return vismask;
+ return vis;
+ }
+
+ ivec vo = ivec(co).mask(0xFFF);
+ no.mask(0xFFF);
+ ivec2 cf[4];
+ int numc = genfacevecs(c, orient, vo, size, false, cf);
+ if(!occludesface(o, opp, no, nsize, vo, size, MAT_AIR, (c.material&MAT_ALPHA)^MAT_ALPHA, MAT_ALPHA, cf, numc)) vis |= 1;
+ if(vismask&2 && !occludesface(o, opp, no, nsize, vo, size, MAT_AIR, MAT_NOCLIP, MATF_CLIP, cf, numc)) vis |= 2;
+ return vis;
+}
+
+// more expensive version that checks both triangles of a face independently
+int visibletris(const cube &c, int orient, const ivec &co, int size, ushort nmat, ushort matmask)
+{
+ int vis = 3, touching = 0xF;
+ ivec v[4], e1, e2, e3, n;
+ genfaceverts(c, orient, v);
+ n.cross((e1 = v[1]).sub(v[0]), (e2 = v[2]).sub(v[0]));
+ int convex = (e3 = v[0]).sub(v[3]).dot(n);
+ if(!convex)
+ {
+ if(ivec().cross(e3, e2).iszero() || v[1] == v[3]) { if(n.iszero()) return 0; vis = 1; touching = 0xF&~(1<<3); }
+ else if(n.iszero()) { vis = 2; touching = 0xF&~(1<<1); }
+ }
+
+ int dim = dimension(orient), coord = dimcoord(orient);
+ if(v[0][dim] != coord*8) touching &= ~(1<<0);
+ if(v[1][dim] != coord*8) touching &= ~(1<<1);
+ if(v[2][dim] != coord*8) touching &= ~(1<<2);
+ if(v[3][dim] != coord*8) touching &= ~(1<<3);
+ static const int notouchmasks[2][16] = // mask of triangles not touching
+ { // order 0: flat or convex
+ // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+ { 3, 3, 3, 3, 3, 3, 3, 2, 3, 3, 3, 3, 3, 1, 3, 0 },
+ // order 1: concave
+ { 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 2, 0 },
+ };
+ int order = convex < 0 ? 1 : 0, notouch = notouchmasks[order][touching];
+ if((vis&notouch)==vis) return vis;
+
+ ivec no;
+ int nsize;
+ const cube &o = neighbourcube(c, orient, co, size, no, nsize);
+ if(&o==&c) return 0;
+
+ if((c.material&matmask) == nmat) nmat = MAT_AIR;
+
+ ivec vo = ivec(co).mask(0xFFF);
+ no.mask(0xFFF);
+ ivec2 cf[4], of[4];
+ int opp = opposite(orient), numo = 0, numc;
+ if(nsize > size || (nsize == size && !o.children))
+ {
+ if(isempty(o) || notouchingface(o, opp)) return vis;
+ if(nmat != MAT_AIR && (o.material&matmask) == nmat) return vis;
+ if(isentirelysolid(o) || (touchingface(o, opp) && faceedges(o, opp) == F_SOLID)) return vis&notouch;
+
+ numc = genfacevecs(c, orient, vo, size, false, cf, v);
+ numo = genfacevecs(o, opp, no, nsize, false, of);
+ if(numo < 3) return vis;
+ if(insideface(cf, numc, of, numo)) return vis&notouch;
+ }
+ else
+ {
+ numc = genfacevecs(c, orient, vo, size, false, cf, v);
+ if(occludesface(o, opp, no, nsize, vo, size, MAT_AIR, nmat, matmask, cf, numc)) return vis&notouch;
+ }
+ if(vis != 3 || notouch) return vis;
+
+ static const int triverts[2][2][2][3] =
+ { // order
+ { // coord
+ { { 1, 2, 3 }, { 0, 1, 3 } }, // verts
+ { { 0, 1, 2 }, { 0, 2, 3 } }
+ },
+ { // coord
+ { { 0, 1, 2 }, { 3, 0, 2 } }, // verts
+ { { 1, 2, 3 }, { 1, 3, 0 } }
+ }
+ };
+
+ do
+ {
+ loopi(2)
+ {
+ const int *verts = triverts[order][coord][i];
+ ivec2 tf[3] = { cf[verts[0]], cf[verts[1]], cf[verts[2]] };
+ if(numo > 0) { if(!insideface(tf, 3, of, numo)) continue; }
+ else if(!occludesface(o, opp, no, nsize, vo, size, MAT_AIR, nmat, matmask, tf, 3)) continue;
+ return vis & ~(1<<i);
+ }
+ vis |= 4;
+ } while(++order <= 1);
+
+ return 3;
+}
+
+void calcvert(const cube &c, const ivec &co, int size, ivec &v, int i, bool solid)
+{
+ if(solid) v = cubecoords[i]; else gencubevert(c, i, v);
+ // avoid overflow
+ if(size>=8) v.mul(size/8);
+ else v.div(8/size);
+ v.add(ivec(co).shl(3));
+}
+
+void calcvert(const cube &c, const ivec &co, int size, vec &v, int i, bool solid)
+{
+ if(solid) v = vec(cubecoords[i]); else gencubevert(c, i, v);
+ v.mul(size/8.0f).add(vec(co));
+}
+
+int genclipplane(const cube &c, int orient, vec *v, plane *clip)
+{
+ int planes = 0, convex = faceconvexity(c, orient), order = convex < 0 ? 1 : 0;
+ const vec &v0 = v[fv[orient][order]], &v1 = v[fv[orient][order+1]], &v2 = v[fv[orient][order+2]], &v3 = v[fv[orient][(order+3)&3]];
+ if(v0==v2) return 0;
+ if(v0!=v1 && v1!=v2) clip[planes++].toplane(v0, v1, v2);
+ if(v0!=v3 && v2!=v3 && (!planes || convex)) clip[planes++].toplane(v0, v2, v3);
+ return planes;
+}
+
+void genclipplanes(const cube &c, const ivec &co, int size, clipplanes &p, bool collide)
+{
+ // generate tight bounding box
+ calcvert(c, co, size, p.v[0], 0);
+ vec mx = p.v[0], mn = p.v[0];
+ for(int i = 1; i < 8; i++)
+ {
+ calcvert(c, co, size, p.v[i], i);
+ mx.max(p.v[i]);
+ mn.min(p.v[i]);
+ }
+
+ p.r = mx.sub(mn).mul(0.5f);
+ p.o = mn.add(p.r);
+
+ p.size = 0;
+ p.visible = 0;
+ if(collide || (c.visible&0xC0) == 0x40)
+ {
+ loopi(6) if(c.visible&(1<<i))
+ {
+ int vis;
+ if(flataxisface(c, i)) p.visible |= 1<<i;
+ else if((vis = visibletris(c, i, co, size, MAT_NOCLIP, MATF_CLIP)))
+ {
+ int convex = faceconvexity(c, i), order = vis&4 || convex < 0 ? 1 : 0;
+ const vec &v0 = p.v[fv[i][order]], &v1 = p.v[fv[i][order+1]], &v2 = p.v[fv[i][order+2]], &v3 = p.v[fv[i][(order+3)&3]];
+ if(vis&1) { p.side[p.size] = i; p.p[p.size++].toplane(v0, v1, v2); }
+ if(vis&2 && (!(vis&1) || convex)) { p.side[p.size] = i; p.p[p.size++].toplane(v0, v2, v3); }
+ }
+ }
+ }
+ else if(c.visible&0x80)
+ {
+ int vis;
+ loopi(6) if((vis = visibletris(c, i, co, size)))
+ {
+ if(flataxisface(c, i)) p.visible |= 1<<i;
+ else
+ {
+ int convex = faceconvexity(c, i), order = vis&4 || convex < 0 ? 1 : 0;
+ const vec &v0 = p.v[fv[i][order]], &v1 = p.v[fv[i][order+1]], &v2 = p.v[fv[i][order+2]], &v3 = p.v[fv[i][(order+3)&3]];
+ if(vis&1) { p.side[p.size] = i; p.p[p.size++].toplane(v0, v1, v2); }
+ if(vis&2 && (!(vis&1) || convex)) { p.side[p.size] = i; p.p[p.size++].toplane(v0, v2, v3); }
+ }
+ }
+ }
+}
+
+static inline bool mergefacecmp(const facebounds &x, const facebounds &y)
+{
+ if(x.v2 < y.v2) return true;
+ if(x.v2 > y.v2) return false;
+ if(x.u1 < y.u1) return true;
+ if(x.u1 > y.u1) return false;
+ return false;
+}
+
+static int mergefacev(int orient, facebounds *m, int sz, facebounds &n)
+{
+ for(int i = sz-1; i >= 0; --i)
+ {
+ if(m[i].v2 < n.v1) break;
+ if(m[i].v2 == n.v1 && m[i].u1 == n.u1 && m[i].u2 == n.u2)
+ {
+ n.v1 = m[i].v1;
+ memmove(&m[i], &m[i+1], (sz - (i+1)) * sizeof(facebounds));
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int mergefaceu(int orient, facebounds &m, facebounds &n)
+{
+ if(m.v1 == n.v1 && m.v2 == n.v2 && m.u2 == n.u1)
+ {
+ n.u1 = m.u1;
+ return 1;
+ }
+ return 0;
+}
+
+static int mergeface(int orient, facebounds *m, int sz, facebounds &n)
+{
+ for(bool merged = false; sz; merged = true)
+ {
+ int vmerged = mergefacev(orient, m, sz, n);
+ sz -= vmerged;
+ if(!vmerged && merged) break;
+ if(!sz) break;
+ int umerged = mergefaceu(orient, m[sz-1], n);
+ sz -= umerged;
+ if(!umerged) break;
+ }
+ m[sz++] = n;
+ return sz;
+}
+
+int mergefaces(int orient, facebounds *m, int sz)
+{
+ quicksort(m, sz, mergefacecmp);
+
+ int nsz = 0;
+ loopi(sz) nsz = mergeface(orient, m, nsz, m[i]);
+ return nsz;
+}
+
+struct cfkey
+{
+ uchar orient;
+ ushort material, tex;
+ ivec n;
+ int offset;
+};
+
+static inline bool htcmp(const cfkey &x, const cfkey &y)
+{
+ return x.orient == y.orient && x.tex == y.tex && x.n == y.n && x.offset == y.offset && x.material==y.material;
+}
+
+static inline uint hthash(const cfkey &k)
+{
+ return hthash(k.n)^k.offset^k.tex^k.orient^k.material;
+}
+
+void mincubeface(const cube &cu, int orient, const ivec &o, int size, const facebounds &orig, facebounds &cf, ushort nmat, ushort matmask)
+{
+ int dim = dimension(orient);
+ if(cu.children)
+ {
+ size >>= 1;
+ int coord = dimcoord(orient);
+ loopi(8) if(octacoord(dim, i) == coord)
+ mincubeface(cu.children[i], orient, ivec(i, o, size), size, orig, cf, nmat, matmask);
+ return;
+ }
+ int c = C[dim], r = R[dim];
+ ushort uco = (o[c]&0xFFF)<<3, vco = (o[r]&0xFFF)<<3;
+ ushort uc1 = uco, vc1 = vco, uc2 = ushort(size<<3)+uco, vc2 = ushort(size<<3)+vco;
+ uc1 = max(uc1, orig.u1);
+ uc2 = min(uc2, orig.u2);
+ vc1 = max(vc1, orig.v1);
+ vc2 = min(vc2, orig.v2);
+ if(!isempty(cu) && touchingface(cu, orient) && !(nmat!=MAT_AIR && (cu.material&matmask)==nmat))
+ {
+ uchar r1 = cu.edges[faceedgesidx[orient][0]], r2 = cu.edges[faceedgesidx[orient][1]],
+ c1 = cu.edges[faceedgesidx[orient][2]], c2 = cu.edges[faceedgesidx[orient][3]];
+ ushort u1 = max(c1&0xF, c2&0xF)*size+uco, u2 = min(c1>>4, c2>>4)*size+uco,
+ v1 = max(r1&0xF, r2&0xF)*size+vco, v2 = min(r1>>4, r2>>4)*size+vco;
+ u1 = max(u1, orig.u1);
+ u2 = min(u2, orig.u2);
+ v1 = max(v1, orig.v1);
+ v2 = min(v2, orig.v2);
+ if(v2-v1==vc2-vc1)
+ {
+ if(u2-u1==uc2-uc1) return;
+ if(u1==uc1) uc1 = u2;
+ if(u2==uc2) uc2 = u1;
+ }
+ else if(u2-u1==uc2-uc1)
+ {
+ if(v1==vc1) vc1 = v2;
+ if(v2==vc2) vc2 = v1;
+ }
+ }
+ if(uc1==uc2 || vc1==vc2) return;
+ cf.u1 = min(cf.u1, uc1);
+ cf.u2 = max(cf.u2, uc2);
+ cf.v1 = min(cf.v1, vc1);
+ cf.v2 = max(cf.v2, vc2);
+}
+
+bool mincubeface(const cube &cu, int orient, const ivec &co, int size, facebounds &orig)
+{
+ ivec no;
+ int nsize;
+ const cube &nc = neighbourcube(cu, orient, co, size, no, nsize);
+ facebounds mincf;
+ mincf.u1 = orig.u2;
+ mincf.u2 = orig.u1;
+ mincf.v1 = orig.v2;
+ mincf.v2 = orig.v1;
+ mincubeface(nc, opposite(orient), no, nsize, orig, mincf, cu.material&MAT_ALPHA ? MAT_AIR : MAT_ALPHA, MAT_ALPHA);
+ bool smaller = false;
+ if(mincf.u1 > orig.u1) { orig.u1 = mincf.u1; smaller = true; }
+ if(mincf.u2 < orig.u2) { orig.u2 = mincf.u2; smaller = true; }
+ if(mincf.v1 > orig.v1) { orig.v1 = mincf.v1; smaller = true; }
+ if(mincf.v2 < orig.v2) { orig.v2 = mincf.v2; smaller = true; }
+ return smaller;
+}
+
+VAR(maxmerge, 0, 6, 12);
+VAR(minface, 0, 4, 12);
+
+struct pvert
+{
+ ushort x, y;
+
+ pvert() {}
+ pvert(ushort x, ushort y) : x(x), y(y) {}
+
+ bool operator==(const pvert &o) const { return x == o.x && y == o.y; }
+ bool operator!=(const pvert &o) const { return x != o.x || y != o.y; }
+};
+
+struct pedge
+{
+ pvert from, to;
+
+ pedge() {}
+ pedge(const pvert &from, const pvert &to) : from(from), to(to) {}
+
+ bool operator==(const pedge &o) const { return from == o.from && to == o.to; }
+ bool operator!=(const pedge &o) const { return from != o.from || to != o.to; }
+};
+
+static inline uint hthash(const pedge &x) { return uint(x.from.x)^(uint(x.from.y)<<8); }
+static inline bool htcmp(const pedge &x, const pedge &y) { return x == y; }
+
+struct poly
+{
+ cube *c;
+ int numverts;
+ bool merged;
+ pvert verts[MAXFACEVERTS];
+};
+
+bool clippoly(poly &p, const facebounds &b)
+{
+ pvert verts1[MAXFACEVERTS+4], verts2[MAXFACEVERTS+4];
+ int numverts1 = 0, numverts2 = 0, px = p.verts[p.numverts-1].x, py = p.verts[p.numverts-1].y;
+ loopi(p.numverts)
+ {
+ int x = p.verts[i].x, y = p.verts[i].y;
+ if(x < b.u1)
+ {
+ if(px > b.u2) verts1[numverts1++] = pvert(b.u2, y + ((y - py)*(b.u2 - x))/(x - px));
+ if(px > b.u1) verts1[numverts1++] = pvert(b.u1, y + ((y - py)*(b.u1 - x))/(x - px));
+ }
+ else if(x > b.u2)
+ {
+ if(px < b.u1) verts1[numverts1++] = pvert(b.u1, y + ((y - py)*(b.u1 - x))/(x - px));
+ if(px < b.u2) verts1[numverts1++] = pvert(b.u2, y + ((y - py)*(b.u2 - x))/(x - px));
+ }
+ else
+ {
+ if(px < b.u1)
+ {
+ if(x > b.u1) verts1[numverts1++] = pvert(b.u1, y + ((y - py)*(b.u1 - x))/(x - px));
+ }
+ else if(px > b.u2 && x < b.u2) verts1[numverts1++] = pvert(b.u2, y + ((y - py)*(b.u2 - x))/(x - px));
+ verts1[numverts1++] = pvert(x, y);
+ }
+ px = x;
+ py = y;
+ }
+ if(numverts1 < 3) return false;
+ px = verts1[numverts1-1].x;
+ py = verts1[numverts1-1].y;
+ loopi(numverts1)
+ {
+ int x = verts1[i].x, y = verts1[i].y;
+ if(y < b.v1)
+ {
+ if(py > b.v2) verts2[numverts2++] = pvert(x + ((x - px)*(b.v2 - y))/(y - py), b.v2);
+ if(py > b.v1) verts2[numverts2++] = pvert(x + ((x - px)*(b.v1 - y))/(y - py), b.v1);
+ }
+ else if(y > b.v2)
+ {
+ if(py < b.v1) verts2[numverts2++] = pvert(x + ((x - px)*(b.v1 - y))/(y - py), b.v1);
+ if(py < b.v2) verts2[numverts2++] = pvert(x + ((x - px)*(b.v2 - y))/(y - py), b.v2);
+ }
+ else
+ {
+ if(py < b.v1)
+ {
+ if(y > b.v1) verts2[numverts2++] = pvert(x + ((x - px)*(b.v1 - y))/(y - py), b.v1);
+ }
+ else if(py > b.v2 && y < b.v2) verts2[numverts2++] = pvert(x + ((x - px)*(b.v2 - y))/(y - py), b.v2);
+ verts2[numverts2++] = pvert(x, y);
+ }
+ px = x;
+ py = y;
+ }
+ if(numverts2 < 3) return false;
+ if(numverts2 > MAXFACEVERTS) return false;
+ memcpy(p.verts, verts2, numverts2*sizeof(pvert));
+ p.numverts = numverts2;
+ return true;
+}
+
+bool genpoly(cube &cu, int orient, const ivec &o, int size, int vis, ivec &n, int &offset, poly &p)
+{
+ int dim = dimension(orient), coord = dimcoord(orient);
+ ivec v[4];
+ genfaceverts(cu, orient, v);
+ if(flataxisface(cu, orient))
+ {
+ n = ivec(0, 0, 0);
+ n[dim] = coord ? 1 : -1;
+ }
+ else
+ {
+ if(faceconvexity(v)) return false;
+ n.cross(ivec(v[1]).sub(v[0]), ivec(v[2]).sub(v[0]));
+ if(n.iszero()) n.cross(ivec(v[2]).sub(v[0]), ivec(v[3]).sub(v[0]));
+ reduceslope(n);
+ }
+
+ ivec po = ivec(o).mask(0xFFF).shl(3);
+ loopk(4) v[k].mul(size).add(po);
+ offset = -n.dot(v[3]);
+
+ int r = R[dim], c = C[dim], order = vis&4 ? 1 : 0;
+ p.numverts = 0;
+ if(coord)
+ {
+ const ivec &v0 = v[order]; p.verts[p.numverts++] = pvert(v0[c], v0[r]);
+ if(vis&1) { const ivec &v1 = v[order+1]; p.verts[p.numverts++] = pvert(v1[c], v1[r]); }
+ const ivec &v2 = v[order+2]; p.verts[p.numverts++] = pvert(v2[c], v2[r]);
+ if(vis&2) { const ivec &v3 = v[(order+3)&3]; p.verts[p.numverts++] = pvert(v3[c], v3[r]); }
+ }
+ else
+ {
+ if(vis&2) { const ivec &v3 = v[(order+3)&3]; p.verts[p.numverts++] = pvert(v3[c], v3[r]); }
+ const ivec &v2 = v[order+2]; p.verts[p.numverts++] = pvert(v2[c], v2[r]);
+ if(vis&1) { const ivec &v1 = v[order+1]; p.verts[p.numverts++] = pvert(v1[c], v1[r]); }
+ const ivec &v0 = v[order]; p.verts[p.numverts++] = pvert(v0[c], v0[r]);
+ }
+
+ if(faceedges(cu, orient)!=F_SOLID)
+ {
+ int px = int(p.verts[p.numverts-2].x) - int(p.verts[p.numverts-3].x), py = int(p.verts[p.numverts-2].y) - int(p.verts[p.numverts-3].y),
+ cx = int(p.verts[p.numverts-1].x) - int(p.verts[p.numverts-2].x), cy = int(p.verts[p.numverts-1].y) - int(p.verts[p.numverts-2].y),
+ dir = px*cy - py*cx;
+ if(dir > 0) return false;
+ if(!dir) { if(p.numverts < 4) return false; p.verts[p.numverts-2] = p.verts[p.numverts-1]; p.numverts--; }
+ px = cx; py = cy;
+ cx = int(p.verts[0].x) - int(p.verts[p.numverts-1].x); cy = int(p.verts[0].y) - int(p.verts[p.numverts-1].y);
+ dir = px*cy - py*cx;
+ if(dir > 0) return false;
+ if(!dir) { if(p.numverts < 4) return false; p.numverts--; }
+ px = cx; py = cy;
+ cx = int(p.verts[1].x) - int(p.verts[0].x); cy = int(p.verts[1].y) - int(p.verts[0].y);
+ dir = px*cy - py*cx;
+ if(dir > 0) return false;
+ if(!dir) { if(p.numverts < 4) return false; p.verts[0] = p.verts[p.numverts-1]; p.numverts--; }
+ px = cx; py = cy;
+ cx = int(p.verts[2].x) - int(p.verts[1].x); cy = int(p.verts[2].y) - int(p.verts[1].y);
+ dir = px*cy - py*cx;
+ if(dir > 0) return false;
+ if(!dir) { if(p.numverts < 4) return false; p.verts[1] = p.verts[2]; p.verts[2] = p.verts[3]; p.numverts--; }
+ }
+
+ p.c = &cu;
+ p.merged = false;
+
+ if(minface && size >= 1<<minface && touchingface(cu, orient))
+ {
+ facebounds b;
+ b.u1 = b.u2 = p.verts[0].x;
+ b.v1 = b.v2 = p.verts[0].y;
+ for(int i = 1; i < p.numverts; i++)
+ {
+ const pvert &v = p.verts[i];
+ b.u1 = min(b.u1, v.x);
+ b.u2 = max(b.u2, v.x);
+ b.v1 = min(b.v1, v.y);
+ b.v2 = max(b.v2, v.y);
+ }
+ if(mincubeface(cu, orient, o, size, b) && clippoly(p, b))
+ p.merged = true;
+ }
+
+ return true;
+}
+
+struct plink : pedge
+{
+ int polys[2];
+
+ plink() { clear(); }
+ plink(const pedge &p) : pedge(p) { clear(); }
+
+ void clear() { polys[0] = polys[1] = -1; }
+};
+
+bool mergepolys(int orient, hashset<plink> &links, vector<plink *> &queue, int owner, poly &p, poly &q, const pedge &e)
+{
+ int pe = -1, qe = -1;
+ loopi(p.numverts) if(p.verts[i] == e.from) { pe = i; break; }
+ loopi(q.numverts) if(q.verts[i] == e.to) { qe = i; break; }
+ if(pe < 0 || qe < 0) return false;
+ if(p.verts[(pe+1)%p.numverts] != e.to || q.verts[(qe+1)%q.numverts] != e.from) return false;
+ /*
+ * c----d
+ * | |
+ * F----T
+ * | P |
+ * b----a
+ */
+ pvert verts[2*MAXFACEVERTS];
+ int numverts = 0, index = pe+2; // starts at A = T+1, ends at F = T+p.numverts
+ loopi(p.numverts-1)
+ {
+ if(index >= p.numverts) index -= p.numverts;
+ verts[numverts++] = p.verts[index++];
+ }
+ index = qe+2; // starts at C = T+2 = F+1, ends at T = T+q.numverts
+ int px = int(verts[numverts-1].x) - int(verts[numverts-2].x), py = int(verts[numverts-1].y) - int(verts[numverts-2].y);
+ loopi(q.numverts-1)
+ {
+ if(index >= q.numverts) index -= q.numverts;
+ pvert &src = q.verts[index++];
+ int cx = int(src.x) - int(verts[numverts-1].x), cy = int(src.y) - int(verts[numverts-1].y),
+ dir = px*cy - py*cx;
+ if(dir > 0) return false;
+ if(!dir) numverts--;
+ verts[numverts++] = src;
+ px = cx;
+ py = cy;
+ }
+ int cx = int(verts[0].x) - int(verts[numverts-1].x), cy = int(verts[0].y) - int(verts[numverts-1].y),
+ dir = px*cy - py*cx;
+ if(dir > 0) return false;
+ if(!dir) numverts--;
+
+ if(numverts > MAXFACEVERTS) return false;
+
+ q.merged = true;
+ q.numverts = 0;
+
+ p.merged = true;
+ p.numverts = numverts;
+ memcpy(p.verts, verts, numverts*sizeof(pvert));
+
+ int prev = p.numverts-1;
+ loopj(p.numverts)
+ {
+ pedge e(p.verts[prev], p.verts[j]);
+ int order = e.from.x > e.to.x || (e.from.x == e.to.x && e.from.y > e.to.y) ? 1 : 0;
+ if(order) swap(e.from, e.to);
+ plink &l = links.access(e, e);
+ bool shouldqueue = l.polys[order] < 0 && l.polys[order^1] >= 0;
+ l.polys[order] = owner;
+ if(shouldqueue) queue.add(&l);
+ prev = j;
+ }
+
+ return true;
+}
+
+void addmerge(cube &cu, int orient, const ivec &co, const ivec &n, int offset, poly &p)
+{
+ cu.merged |= 1<<orient;
+ if(!p.numverts)
+ {
+ if(cu.ext) cu.ext->surfaces[orient] = ambientsurface;
+ return;
+ }
+ surfaceinfo surf = brightsurface;
+ vertinfo verts[MAXFACEVERTS];
+ surf.numverts |= p.numverts;
+ int dim = dimension(orient), coord = dimcoord(orient), c = C[dim], r = R[dim];
+ loopk(p.numverts)
+ {
+ pvert &src = p.verts[coord ? k : p.numverts-1-k];
+ vertinfo &dst = verts[k];
+ ivec v;
+ v[c] = src.x;
+ v[r] = src.y;
+ v[dim] = -(offset + n[c]*src.x + n[r]*src.y)/n[dim];
+ dst.set(v);
+ }
+ if(cu.ext)
+ {
+ const surfaceinfo &oldsurf = cu.ext->surfaces[orient];
+ int numverts = oldsurf.numverts&MAXFACEVERTS;
+ if(numverts == p.numverts)
+ {
+ ivec v0 = verts[0].getxyz();
+ const vertinfo *oldverts = cu.ext->verts() + oldsurf.verts;
+ loopj(numverts) if(v0 == oldverts[j].getxyz())
+ {
+ for(int k = 1; k < numverts; k++)
+ {
+ if(++j >= numverts) j = 0;
+ if(verts[k].getxyz() != oldverts[j].getxyz()) goto nomatch;
+ }
+ return;
+ }
+ nomatch:;
+ }
+ }
+ setsurface(cu, orient, surf, verts, p.numverts);
+}
+
+static inline void clearmerge(cube &c, int orient)
+{
+ if(c.merged&(1<<orient))
+ {
+ c.merged &= ~(1<<orient);
+ if(c.ext) c.ext->surfaces[orient] = brightsurface;
+ }
+}
+
+void addmerges(int orient, const ivec &co, const ivec &n, int offset, vector<poly> &polys)
+{
+ loopv(polys)
+ {
+ poly &p = polys[i];
+ if(p.merged) addmerge(*p.c, orient, co, n, offset, p);
+ else clearmerge(*p.c, orient);
+ }
+}
+
+void mergepolys(int orient, const ivec &co, const ivec &n, int offset, vector<poly> &polys)
+{
+ if(polys.length() <= 1) { addmerges(orient, co, n, offset, polys); return; }
+ hashset<plink> links(polys.length() <= 32 ? 128 : 1024);
+ vector<plink *> queue;
+ loopv(polys)
+ {
+ poly &p = polys[i];
+ int prev = p.numverts-1;
+ loopj(p.numverts)
+ {
+ pedge e(p.verts[prev], p.verts[j]);
+ int order = e.from.x > e.to.x || (e.from.x == e.to.x && e.from.y > e.to.y) ? 1 : 0;
+ if(order) swap(e.from, e.to);
+ plink &l = links.access(e, e);
+ l.polys[order] = i;
+ if(l.polys[0] >= 0 && l.polys[1] >= 0) queue.add(&l);
+ prev = j;
+ }
+ }
+ vector<plink *> nextqueue;
+ while(queue.length())
+ {
+ loopv(queue)
+ {
+ plink &l = *queue[i];
+ if(l.polys[0] >= 0 && l.polys[1] >= 0)
+ mergepolys(orient, links, nextqueue, l.polys[0], polys[l.polys[0]], polys[l.polys[1]], l);
+ }
+ queue.setsize(0);
+ queue.move(nextqueue);
+ }
+ addmerges(orient, co, n, offset, polys);
+}
+
+static int genmergeprogress = 0;
+
+struct cfpolys
+{
+ vector<poly> polys;
+};
+
+static hashtable<cfkey, cfpolys> cpolys;
+
+void genmerges(cube *c = worldroot, const ivec &o = ivec(0, 0, 0), int size = worldsize>>1)
+{
+ if((genmergeprogress++&0xFFF)==0) renderprogress(float(genmergeprogress)/allocnodes, "merging faces...");
+ neighbourstack[++neighbourdepth] = c;
+ loopi(8)
+ {
+ ivec co(i, o, size);
+ int vis;
+ if(c[i].children) genmerges(c[i].children, co, size>>1);
+ else if(!isempty(c[i])) loopj(6) if((vis = visibletris(c[i], j, co, size)))
+ {
+ cfkey k;
+ poly p;
+ if(size < 1<<maxmerge && c != worldroot)
+ {
+ if(genpoly(c[i], j, co, size, vis, k.n, k.offset, p))
+ {
+ k.orient = j;
+ k.tex = c[i].texture[j];
+ k.material = c[i].material&MAT_ALPHA;
+ cpolys[k].polys.add(p);
+ continue;
+ }
+ }
+ else if(minface && size >= 1<<minface && touchingface(c[i], j))
+ {
+ if(genpoly(c[i], j, co, size, vis, k.n, k.offset, p) && p.merged)
+ {
+ addmerge(c[i], j, co, k.n, k.offset, p);
+ continue;
+ }
+ }
+ clearmerge(c[i], j);
+ }
+ if((size == 1<<maxmerge || c == worldroot) && cpolys.numelems)
+ {
+ enumeratekt(cpolys, cfkey, key, cfpolys, val,
+ {
+ mergepolys(key.orient, co, key.n, key.offset, val.polys);
+ });
+ cpolys.clear();
+ }
+ }
+ --neighbourdepth;
+}
+
+int calcmergedsize(int orient, const ivec &co, int size, const vertinfo *verts, int numverts)
+{
+ ushort x1 = verts[0].x, y1 = verts[0].y, z1 = verts[0].z,
+ x2 = x1, y2 = y1, z2 = z1;
+ for(int i = 1; i < numverts; i++)
+ {
+ const vertinfo &v = verts[i];
+ x1 = min(x1, v.x);
+ x2 = max(x2, v.x);
+ y1 = min(y1, v.y);
+ y2 = max(y2, v.y);
+ z1 = min(z1, v.z);
+ z2 = max(z2, v.z);
+ }
+ int bits = 0;
+ while(1<<bits < size) ++bits;
+ bits += 3;
+ ivec mo(co);
+ mo.mask(0xFFF);
+ mo.shl(3);
+ while(bits<15)
+ {
+ mo.mask(~((1<<bits)-1));
+ if(mo.x <= x1 && mo.x + (1<<bits) >= x2 &&
+ mo.y <= y1 && mo.y + (1<<bits) >= y2 &&
+ mo.z <= z1 && mo.z + (1<<bits) >= z2)
+ break;
+ bits++;
+ }
+ return bits-3;
+}
+
+static void invalidatemerges(cube &c)
+{
+ if(c.merged)
+ {
+ brightencube(c);
+ c.merged = 0;
+ }
+ if(c.ext)
+ {
+ if(c.ext->va)
+ {
+ if(!(c.ext->va->hasmerges&(MERGE_PART | MERGE_ORIGIN))) return;
+ destroyva(c.ext->va);
+ c.ext->va = NULL;
+ }
+ if(c.ext->tjoints >= 0) c.ext->tjoints = -1;
+ }
+ if(c.children) loopi(8) invalidatemerges(c.children[i]);
+}
+
+static int invalidatedmerges = 0;
+
+void invalidatemerges(cube &c, const ivec &co, int size, bool msg)
+{
+ if(msg && invalidatedmerges!=totalmillis)
+ {
+ renderprogress(0, "invalidating merged surfaces...");
+ invalidatedmerges = totalmillis;
+ }
+ invalidatemerges(c);
+}
+
+void calcmerges()
+{
+ genmergeprogress = 0;
+ genmerges();
+}
+
generated by cgit v1.2.3 (git 2.46.0) at 2026-02-21 09:31:26 +0000