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vhlt/hlbsp/solidbsp.cpp
Vluzacn d32b4b6da1 Vluzacn's ZHLT v34
2016-09-21 00:07:53 +03:00

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61 KiB
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//#pragma warning(disable: 4018) // '<' : signed/unsigned mismatch
#include "bsp5.h"
// FaceSide
// ChooseMidPlaneFromList
// ChoosePlaneFromList
// SelectPartition
// CalcSurfaceInfo
// DivideSurface
// SplitNodeSurfaces
// RankForContents
// ContentsForRank
// FreeLeafSurfs
// LinkLeafFaces
// MakeNodePortal
// SplitNodePortals
// CalcNodeBounds
// CopyFacesToNode
// BuildBspTree_r
// SolidBSP
// Each node or leaf will have a set of portals that completely enclose
// the volume of the node and pass into an adjacent node.
#ifdef HLBSP_FAST_SELECTPARTITION
#include <vector>
#endif
int g_maxnode_size = DEFAULT_MAXNODE_SIZE;
static bool g_reportProgress = false;
static int g_numProcessed = 0;
static int g_numReported = 0;
static void ResetStatus(bool report_progress)
{
g_reportProgress = report_progress;
g_numProcessed = g_numReported = 0;
}
static void UpdateStatus(void)
{
if(g_reportProgress)
{
++g_numProcessed;
if((g_numProcessed / 500) > g_numReported)
{
g_numReported = (g_numProcessed / 500);
Log("%d...",g_numProcessed);
}
}
}
// =====================================================================================
// FaceSide
// For BSP hueristic
// =====================================================================================
static int FaceSide(face_t* in, const dplane_t* const split
#ifdef HLBSP_AVOIDEPSILONSPLIT
, double *epsilonsplit = NULL
#endif
)
{
#ifdef HLBSP_AVOIDEPSILONSPLIT
const vec_t epsilonmin = 0.002, epsilonmax = 0.2;
vec_t d_front, d_back;
#else
int frontcount, backcount;
#endif
vec_t dot;
int i;
vec_t* p;
#ifdef HLBSP_AVOIDEPSILONSPLIT
d_front = d_back = 0;
#else
frontcount = backcount = 0;
#endif
// axial planes are fast
if (split->type <= last_axial)
{
vec_t splitGtEp = split->dist + ON_EPSILON; // Invariant moved out of loop
vec_t splitLtEp = split->dist - ON_EPSILON; // Invariant moved out of loop
for (i = 0, p = in->pts[0] + split->type; i < in->numpoints; i++, p += 3)
{
#ifdef HLBSP_AVOIDEPSILONSPLIT
dot = *p - split->dist;
if (dot > d_front)
d_front = dot;
if (dot < d_back)
d_back = dot;
#else
if (*p > splitGtEp)
{
if (backcount)
{
return SIDE_ON;
}
frontcount = 1;
}
else if (*p < splitLtEp)
{
if (frontcount)
{
return SIDE_ON;
}
backcount = 1;
}
#endif
}
}
else
{
// sloping planes take longer
for (i = 0, p = in->pts[0]; i < in->numpoints; i++, p += 3)
{
dot = DotProduct(p, split->normal);
dot -= split->dist;
#ifdef HLBSP_AVOIDEPSILONSPLIT
if (dot > d_front)
d_front = dot;
if (dot < d_back)
d_back = dot;
#else
if (dot > ON_EPSILON)
{
if (backcount)
{
return SIDE_ON;
}
frontcount = 1;
}
else if (dot < -ON_EPSILON)
{
if (frontcount)
{
return SIDE_ON;
}
backcount = 1;
}
#endif
}
}
#ifdef HLBSP_AVOIDEPSILONSPLIT
if (d_front <= ON_EPSILON)
{
if (d_front > epsilonmin || d_back > -epsilonmax)
{
if (epsilonsplit)
(*epsilonsplit)++;
}
return SIDE_BACK;
}
if (d_back >= -ON_EPSILON)
{
if (d_back < -epsilonmin || d_front < epsilonmax)
{
if (epsilonsplit)
(*epsilonsplit)++;
}
return SIDE_FRONT;
}
if (d_front < epsilonmax || d_back > -epsilonmax)
{
if (epsilonsplit)
(*epsilonsplit)++;
}
return SIDE_ON;
#else
if (!frontcount)
{
return SIDE_BACK;
}
if (!backcount)
{
return SIDE_FRONT;
}
return SIDE_ON;
#endif
}
#ifdef HLBSP_FAST_SELECTPARTITION
// organize all surfaces into a tree structure to accelerate intersection test
// can reduce more than 90% compile time for very complicated maps
typedef struct surfacetreenode_s
{
int size; // can be zero, which invalidates mins and maxs
#ifdef HLCSG_HLBSP_SOLIDHINT
int size_discardable;
#endif
vec3_t mins;
vec3_t maxs;
bool isleaf;
// node
surfacetreenode_s *children[2];
std::vector< face_t * > *nodefaces;
#ifdef HLCSG_HLBSP_SOLIDHINT
int nodefaces_discardablesize;
#endif
// leaf
std::vector< face_t * > *leaffaces;
}
surfacetreenode_t;
typedef struct
{
bool dontbuild;
vec_t epsilon; // if a face is not epsilon far from the splitting plane, put it in result.middle
surfacetreenode_t *headnode;
struct
{
int frontsize;
int backsize;
std::vector< face_t * > *middle; // may contains coplanar faces and discardable(SOLIDHINT) faces
}
result; // "public"
}
surfacetree_t;
void BuildSurfaceTree_r (surfacetree_t *tree, surfacetreenode_t *node)
{
node->size = node->leaffaces->size ();
#ifdef HLCSG_HLBSP_SOLIDHINT
node->size_discardable = 0;
#endif
if (node->size == 0)
{
node->isleaf = true;
return;
}
VectorFill (node->mins, BOGUS_RANGE);
VectorFill (node->maxs, -BOGUS_RANGE);
for (std::vector< face_t * >::iterator i = node->leaffaces->begin (); i != node->leaffaces->end (); ++i)
{
face_t *f = *i;
for (int x = 0; x < f->numpoints; x++)
{
VectorCompareMinimum (node->mins, f->pts[x], node->mins);
VectorCompareMaximum (node->maxs, f->pts[x], node->maxs);
}
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->facestyle == face_discardable)
{
node->size_discardable++;
}
#endif
}
int bestaxis = -1;
{
vec_t bestdelta = 0;
for (int k = 0; k < 3; k++)
{
if (node->maxs[k] - node->mins[k] > bestdelta + ON_EPSILON)
{
bestaxis = k;
bestdelta = node->maxs[k] - node->mins[k];
}
}
}
if (node->size <= 5 || tree->dontbuild == true || bestaxis == -1)
{
node->isleaf = true;
return;
}
node->isleaf = false;
vec_t dist, dist1, dist2;
dist = (node->mins[bestaxis] + node->maxs[bestaxis]) / 2;
dist1 = (3 * node->mins[bestaxis] + node->maxs[bestaxis]) / 4;
dist2 = (node->mins[bestaxis] + 3 * node->maxs[bestaxis]) / 4;
// Each child node is at most 3/4 the size of the parent node.
// Most faces should be passed to a child node, faces left in the parent node are the ones whose dimensions are large enough to be comparable to the dimension of the parent node.
node->nodefaces = new std::vector< face_t * >;
#ifdef HLCSG_HLBSP_SOLIDHINT
node->nodefaces_discardablesize = 0;
#endif
node->children[0] = (surfacetreenode_t *)malloc (sizeof (surfacetreenode_t));
node->children[0]->leaffaces = new std::vector< face_t * >;
node->children[1] = (surfacetreenode_t *)malloc (sizeof (surfacetreenode_t));
node->children[1]->leaffaces = new std::vector< face_t * >;
for (std::vector< face_t * >::iterator i = node->leaffaces->begin (); i != node->leaffaces->end (); ++i)
{
face_t *f = *i;
vec_t low = BOGUS_RANGE;
vec_t high = -BOGUS_RANGE;
for (int x = 0; x < f->numpoints; x++)
{
low = qmin (low, f->pts[x][bestaxis]);
high = qmax (high, f->pts[x][bestaxis]);
}
if (low < dist1 + ON_EPSILON && high > dist2 - ON_EPSILON)
{
node->nodefaces->push_back (f);
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->facestyle == face_discardable)
{
node->nodefaces_discardablesize++;
}
#endif
}
else if (low >= dist1 && high <= dist2)
{
if ((low + high) / 2 > dist)
{
node->children[0]->leaffaces->push_back (f);
}
else
{
node->children[1]->leaffaces->push_back (f);
}
}
else if (low >= dist1)
{
node->children[0]->leaffaces->push_back (f);
}
else if (high <= dist2)
{
node->children[1]->leaffaces->push_back (f);
}
}
if (node->children[0]->leaffaces->size () == node->leaffaces->size () || node->children[1]->leaffaces->size () == node->leaffaces->size ())
{
Warning ("BuildSurfaceTree_r: didn't split node with bound (%f,%f,%f)-(%f,%f,%f)", node->mins[0], node->mins[1], node->mins[2], node->maxs[0], node->maxs[1], node->maxs[2]);
delete node->children[0]->leaffaces;
delete node->children[1]->leaffaces;
free (node->children[0]);
free (node->children[1]);
delete node->nodefaces;
node->isleaf = true;
return;
}
delete node->leaffaces;
BuildSurfaceTree_r (tree, node->children[0]);
BuildSurfaceTree_r (tree, node->children[1]);
}
surfacetree_t *BuildSurfaceTree (surface_t *surfaces, vec_t epsilon)
{
surfacetree_t *tree;
tree = (surfacetree_t *)malloc (sizeof (surfacetree_t));
tree->epsilon = epsilon;
tree->result.middle = new std::vector< face_t * >;
tree->headnode = (surfacetreenode_t *)malloc (sizeof (surfacetreenode_t));
tree->headnode->leaffaces = new std::vector< face_t * >;
{
surface_t *p2;
face_t *f;
for (p2 = surfaces; p2; p2 = p2->next)
{
if (p2->onnode)
{
continue;
}
for (f = p2->faces; f; f = f->next)
{
tree->headnode->leaffaces->push_back (f);
}
}
}
tree->dontbuild = tree->headnode->leaffaces->size () < 20;
BuildSurfaceTree_r (tree, tree->headnode);
if (tree->dontbuild)
{
*tree->result.middle = *tree->headnode->leaffaces;
tree->result.backsize = 0;
tree->result.frontsize = 0;
}
return tree;
}
void TestSurfaceTree_r (surfacetree_t *tree, const surfacetreenode_t *node, const dplane_t *split)
{
if (node->size == 0)
{
return;
}
vec_t low, high;
low = high = -split->dist;
for (int k = 0; k < 3; k++)
{
if (split->normal[k] >= 0)
{
high += split->normal[k] * node->maxs[k];
low += split->normal[k] * node->mins[k];
}
else
{
high += split->normal[k] * node->mins[k];
low += split->normal[k] * node->maxs[k];
}
}
if (low > tree->epsilon)
{
tree->result.frontsize += node->size;
#ifdef HLCSG_HLBSP_SOLIDHINT
tree->result.frontsize -= node->size_discardable;
#endif
return;
}
if (high < -tree->epsilon)
{
tree->result.backsize += node->size;
#ifdef HLCSG_HLBSP_SOLIDHINT
tree->result.backsize -= node->size_discardable;
#endif
return;
}
if (node->isleaf)
{
for (std::vector< face_t * >::iterator i = node->leaffaces->begin (); i != node->leaffaces->end (); ++i)
{
tree->result.middle->push_back (*i);
}
}
else
{
for (std::vector< face_t * >::iterator i = node->nodefaces->begin (); i != node->nodefaces->end (); ++i)
{
tree->result.middle->push_back (*i);
}
TestSurfaceTree_r (tree, node->children[0], split);
TestSurfaceTree_r (tree, node->children[1], split);
}
}
void TestSurfaceTree (surfacetree_t *tree, const dplane_t *split)
{
if (tree->dontbuild)
{
return;
}
tree->result.middle->clear ();
tree->result.backsize = 0;
tree->result.frontsize = 0;
TestSurfaceTree_r (tree, tree->headnode, split);
}
void DeleteSurfaceTree_r (surfacetreenode_t *node)
{
if (node->isleaf)
{
delete node->leaffaces;
}
else
{
DeleteSurfaceTree_r (node->children[0]);
free (node->children[0]);
DeleteSurfaceTree_r (node->children[1]);
free (node->children[1]);
delete node->nodefaces;
}
}
void DeleteSurfaceTree (surfacetree_t *tree)
{
DeleteSurfaceTree_r (tree->headnode);
free (tree->headnode);
delete tree->result.middle;
free (tree);
}
#endif
// =====================================================================================
// ChooseMidPlaneFromList
// When there are a huge number of planes, just choose one closest
// to the middle.
// =====================================================================================
static surface_t* ChooseMidPlaneFromList(surface_t* surfaces, const vec3_t mins, const vec3_t maxs
#ifdef ZHLT_DETAILBRUSH
, int detaillevel
#endif
)
{
int j, l;
surface_t* p;
surface_t* bestsurface;
vec_t bestvalue;
vec_t value;
vec_t dist;
dplane_t* plane;
#ifdef HLBSP_CHOOSEMIDPLANE
surfacetree_t* surfacetree;
std::vector< face_t * >::iterator it;
face_t* f;
surfacetree = BuildSurfaceTree (surfaces, ON_EPSILON);
#endif
//
// pick the plane that splits the least
//
#ifdef HLBSP_CHOOSEMIDPLANE
bestvalue = 9e30;
#else
#ifdef ZHLT_LARGERANGE
bestvalue = 6.0f * BOGUS_RANGE * BOGUS_RANGE;
#else
bestvalue = 6 * 8192 * 8192;
#endif
#endif
bestsurface = NULL;
for (p = surfaces; p; p = p->next)
{
if (p->onnode)
{
continue;
}
#ifdef ZHLT_DETAILBRUSH
if (p->detaillevel != detaillevel)
{
continue;
}
#endif
plane = &g_dplanes[p->planenum];
// check for axis aligned surfaces
l = plane->type;
if (l > last_axial)
{
continue;
}
//
// calculate the split metric along axis l, smaller values are better
//
value = 0;
dist = plane->dist * plane->normal[l];
#ifdef HLBSP_MAXNODESIZE_SKYBOX
if (maxs[l] - dist < ON_EPSILON || dist - mins[l] < ON_EPSILON)
continue;
#endif
#ifdef HLBSP_ChooseMidPlane_FIX
if (maxs[l] - dist < g_maxnode_size/2.0 - ON_EPSILON || dist - mins[l] < g_maxnode_size/2.0 - ON_EPSILON)
continue;
#endif
#ifdef HLBSP_CHOOSEMIDPLANE
double crosscount = 0;
double frontcount = 0;
double backcount = 0;
double coplanarcount = 0;
TestSurfaceTree (surfacetree, plane);
frontcount += surfacetree->result.frontsize;
backcount += surfacetree->result.backsize;
for (it = surfacetree->result.middle->begin (); it != surfacetree->result.middle->end (); ++it)
{
f = *it;
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->facestyle == face_discardable)
{
continue;
}
#endif
if (f->planenum == p->planenum || f->planenum == (p->planenum ^ 1))
{
coplanarcount++;
continue;
}
switch (FaceSide (f, plane))
{
case SIDE_FRONT:
frontcount++;
break;
case SIDE_BACK:
backcount++;
break;
case SIDE_ON:
crosscount++;
break;
}
}
double frontsize = frontcount + 0.5 * coplanarcount + 0.5 * crosscount;
double frontfrac = (maxs[l] - dist) / (maxs[l] - mins[l]);
double backsize = backcount + 0.5 * coplanarcount + 0.5 * crosscount;
double backfrac = (dist - mins[l]) / (maxs[l] - mins[l]);
value = crosscount + 0.1 * (frontsize * (log (frontfrac) / log (2.0)) + backsize * (log (backfrac) / log (2.0)));
// the first part is how the split will increase the number of faces
// the second part is how the split will increase the average depth of the bsp tree
#else
for (j = 0; j < 3; j++)
{
if (j == l)
{
value += (maxs[l] - dist) * (maxs[l] - dist);
value += (dist - mins[l]) * (dist - mins[l]);
}
else
{
value += 2 * (maxs[j] - mins[j]) * (maxs[j] - mins[j]);
}
}
#endif
if (value > bestvalue)
{
continue;
}
//
// currently the best!
//
bestvalue = value;
bestsurface = p;
}
#ifdef HLBSP_CHOOSEMIDPLANE
DeleteSurfaceTree (surfacetree);
#endif
if (!bestsurface)
{
#ifdef HLBSP_ChooseMidPlane_FIX
return NULL;
#else
for (p = surfaces; p; p = p->next)
{
if (!p->onnode)
{
#ifdef ZHLT_DETAILBRUSH
if (p->detaillevel != detaillevel)
{
continue;
}
#endif
return p; // first valid surface
}
}
Error("ChooseMidPlaneFromList: no valid planes");
#endif
}
return bestsurface;
}
// =====================================================================================
// ChoosePlaneFromList
// Choose the plane that splits the least faces
// =====================================================================================
#ifdef HLBSP_ChoosePlane_VL
static surface_t* ChoosePlaneFromList(surface_t* surfaces, const vec3_t mins, const vec3_t maxs
#ifdef ZHLT_DETAILBRUSH
// mins and maxs are invalid when detaillevel > 0
, int detaillevel
#endif
)
{
surface_t* p;
surface_t* p2;
surface_t* bestsurface;
vec_t bestvalue;
vec_t value;
dplane_t* plane;
face_t* f;
#ifdef HLBSP_FAST_SELECTPARTITION
double planecount;
double totalsplit;
double avesplit;
double (*tmpvalue)[2];
surfacetree_t* surfacetree;
std::vector< face_t * >::iterator it;
planecount = 0;
totalsplit = 0;
tmpvalue = (double (*)[2])malloc (g_numplanes * sizeof (double [2]));
surfacetree = BuildSurfaceTree (surfaces, ON_EPSILON);
#endif
#ifndef HLBSP_FAST_SELECTPARTITION
double avesplit;
double planecount;
{
planecount = 0;
double totalsplit = 0;
for (p = surfaces; p; p = p->next)
{
if (p->onnode)
{
continue;
}
#ifdef ZHLT_DETAILBRUSH
if (p->detaillevel != detaillevel)
{
continue;
}
#endif
planecount++;
plane = &g_dplanes[p->planenum];
for (p2 = surfaces; p2; p2 = p2->next)
{
if (p2->onnode || p2 == p)
{
continue;
}
for (f = p2->faces; f; f = f->next)
{
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->facestyle == face_discardable)
{
continue;
}
#endif
if (FaceSide (f, plane) == SIDE_ON)
{
totalsplit++;
}
}
}
}
avesplit = (double)totalsplit / (double)planecount;
}
#endif
//
// pick the plane that splits the least
//
bestvalue = 9e30;
bestsurface = NULL;
for (p = surfaces; p; p = p->next)
{
if (p->onnode)
{
continue;
}
#ifdef ZHLT_DETAILBRUSH
if (p->detaillevel != detaillevel)
{
continue;
}
#endif
#ifdef HLBSP_FAST_SELECTPARTITION
planecount++;
#endif
double crosscount = 0; // use double here because we need to perform "crosscount++"
double frontcount = 0;
double backcount = 0;
double coplanarcount = 0;
#ifdef HLBSP_AVOIDEPSILONSPLIT
double epsilonsplit = 0;
#endif
plane = &g_dplanes[p->planenum];
for (f = p->faces; f; f = f->next)
{
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->facestyle == face_discardable)
{
continue;
}
#endif
coplanarcount++;
}
#ifdef HLBSP_FAST_SELECTPARTITION
TestSurfaceTree (surfacetree, plane);
{
frontcount += surfacetree->result.frontsize;
backcount += surfacetree->result.backsize;
for (it = surfacetree->result.middle->begin (); it != surfacetree->result.middle->end (); ++it)
{
f = *it;
if (f->planenum == p->planenum || f->planenum == (p->planenum ^ 1))
{
continue;
}
#else
for (p2 = surfaces; p2; p2 = p2->next)
{
if (p2->onnode || p2 == p)
{
continue;
}
for (f = p2->faces; f; f = f->next)
{
#endif
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->facestyle == face_discardable)
{
#ifdef HLBSP_AVOIDEPSILONSPLIT
FaceSide (f, plane, &epsilonsplit);
#endif
continue;
}
#endif
switch (FaceSide(f, plane
#ifdef HLBSP_AVOIDEPSILONSPLIT
, &epsilonsplit
#endif
))
{
case SIDE_FRONT:
frontcount++;
break;
case SIDE_BACK:
backcount++;
break;
case SIDE_ON:
#ifdef HLBSP_FAST_SELECTPARTITION
totalsplit++;
#endif
crosscount++;
break;
}
}
}
value = crosscount - sqrt (coplanarcount); // Not optimized. --vluzacn
#ifdef HLCSG_HLBSP_SOLIDHINT
if (coplanarcount == 0)
{
crosscount += 1;
}
#endif
#ifdef HLBSP_BALANCE
// This is the most efficient code among what I have ever tested:
// (1) BSP file is small, despite possibility of slowing down vis and rad (but still faster than the original non BSP balancing method).
// (2) Factors need not adjust across various maps.
double frac = (coplanarcount / 2 + crosscount / 2 + frontcount) / (coplanarcount + frontcount + backcount + crosscount);
double ent = (0.0001 < frac && frac < 0.9999)? (- frac * log (frac) / log (2.0) - (1 - frac) * log (1 - frac) / log (2.0)): 0.0; // the formula tends to 0 when frac=0,1
#ifdef HLBSP_FAST_SELECTPARTITION
tmpvalue[p->planenum][1] = crosscount * (1 - ent);
#else
value += crosscount * avesplit * (1 - ent);
#endif
#endif
#ifdef HLBSP_AVOIDEPSILONSPLIT
value += epsilonsplit * 10000;
#endif
#ifdef HLBSP_FAST_SELECTPARTITION
tmpvalue[p->planenum][0] = value;
#else
if (value < bestvalue)
{
//
// currently the best!
//
bestvalue = value;
bestsurface = p;
}
#endif
}
#ifdef HLBSP_FAST_SELECTPARTITION
avesplit = totalsplit / planecount;
for (p = surfaces; p; p = p->next)
{
if (p->onnode)
{
continue;
}
#ifdef ZHLT_DETAILBRUSH
if (p->detaillevel != detaillevel)
{
continue;
}
#endif
value = tmpvalue[p->planenum][0] + avesplit * tmpvalue[p->planenum][1];
if (value < bestvalue)
{
bestvalue = value;
bestsurface = p;
}
}
#endif
if (!bestsurface)
Error("ChoosePlaneFromList: no valid planes");
#ifdef HLBSP_FAST_SELECTPARTITION
free (tmpvalue);
DeleteSurfaceTree (surfacetree);
#endif
return bestsurface;
}
#else
static surface_t* ChoosePlaneFromList(surface_t* surfaces, const vec3_t mins, const vec3_t maxs
#ifdef ZHLT_DETAILBRUSH
// mins and maxs are invalid when detaillevel > 0
, int detaillevel
#endif
)
{
int j;
int k;
int l;
surface_t* p;
surface_t* p2;
surface_t* bestsurface;
vec_t bestvalue;
vec_t bestdistribution;
vec_t value;
vec_t dist;
dplane_t* plane;
face_t* f;
//
// pick the plane that splits the least
//
#define UNDESIREABLE_HINT_FACTOR 10000
#define WORST_VALUE 100000000
bestvalue = WORST_VALUE;
bestsurface = NULL;
bestdistribution = 9e30;
for (p = surfaces; p; p = p->next)
{
if (p->onnode)
{
continue;
}
#ifdef ZHLT_DETAILBRUSH
if (p->detaillevel != detaillevel)
{
continue;
}
#endif
#ifdef ZHLT_DETAIL
if (g_bDetailBrushes)
{
// AJM: cycle though all faces, and make sure none of them are detail
// if any of them are, this surface isnt to cause a bsp split
for (face_t* f = p->faces; f; f = f->next)
{
if (f->contents == CONTENTS_DETAIL)
{
//Log("ChoosePlaneFromList::got a detial surface, skipping...\n");
continue; // wrong. --vluzacn
}
}
}
#endif
plane = &g_dplanes[p->planenum];
k = 0;
for (p2 = surfaces; p2; p2 = p2->next)
{
if (p2 == p)
{
continue;
}
if (p2->onnode)
{
continue;
}
for (f = p2->faces; f; f = f->next)
{
// Give this face (a hint brush fragment) a large 'undesireable' value, only split when we have to)
if (f->facestyle == face_hint)
{
k += UNDESIREABLE_HINT_FACTOR;
hlassert(k < WORST_VALUE);
if (k >= WORST_VALUE)
{
Warning("::ChoosePlaneFromList() surface fragmentation undesireability exceeded WORST_VALUE");
k = WORST_VALUE - 1;
}
}
if (FaceSide(f, plane) == SIDE_ON)
{
k++;
if (k >= bestvalue)
{
break;
}
}
}
if (k > bestvalue)
{
break;
}
}
if (k > bestvalue)
{
continue;
}
// if equal numbers, axial planes win, then decide on spatial subdivision
if (k < bestvalue || (k == bestvalue && (plane->type <= last_axial)))
{
// check for axis aligned surfaces
l = plane->type;
if (l <= last_axial)
{ // axial aligned
//
// calculate the split metric along axis l
//
value = 0;
for (j = 0; j < 3; j++)
{
if (j == l)
{
dist = plane->dist * plane->normal[l];
value += (maxs[l] - dist) * (maxs[l] - dist);
value += (dist - mins[l]) * (dist - mins[l]);
}
else
{
value += 2 * (maxs[j] - mins[j]) * (maxs[j] - mins[j]);
}
}
if (value > bestdistribution && k == bestvalue)
{
continue;
}
bestdistribution = value;
}
//
// currently the best!
//
bestvalue = k;
bestsurface = p;
}
}
return bestsurface;
}
#endif
// =====================================================================================
// SelectPartition
// Selects a surface from a linked list of surfaces to split the group on
// returns NULL if the surface list can not be divided any more (a leaf)
// =====================================================================================
#ifdef ZHLT_DETAILBRUSH
int CalcSplitDetaillevel (const node_t *node)
{
int bestdetaillevel = -1;
surface_t *s;
face_t *f;
for (s = node->surfaces; s; s = s->next)
{
if (s->onnode)
{
continue;
}
#ifdef HLCSG_HLBSP_SOLIDHINT
for (f = s->faces; f; f = f->next)
{
if (f->facestyle == face_discardable)
{
continue;
}
if (bestdetaillevel == -1 || f->detaillevel < bestdetaillevel)
{
bestdetaillevel = f->detaillevel;
}
}
#else
if (bestdetaillevel == -1 || s->detaillevel < bestdetaillevel)
{
bestdetaillevel = s->detaillevel;
}
#endif
}
return bestdetaillevel;
}
#endif
static surface_t* SelectPartition(surface_t* surfaces, const node_t* const node, const bool usemidsplit
#ifdef ZHLT_DETAILBRUSH
, int splitdetaillevel
#endif
#ifdef HLBSP_MAXNODESIZE_SKYBOX
, vec3_t validmins, vec3_t validmaxs
#endif
)
{
#ifdef ZHLT_DETAILBRUSH
if (splitdetaillevel == -1)
{
return NULL;
}
// now we MUST choose a surface of this detail level
#else
int i;
surface_t* p;
surface_t* bestsurface;
//
// count surface choices
//
i = 0;
bestsurface = NULL;
for (p = surfaces; p; p = p->next)
{
if (!p->onnode)
{
#ifdef ZHLT_DETAIL
if (g_bDetailBrushes)
{
// AJM: cycle though all faces, and make sure none of them are detail
// if any of them are, this surface isnt to cause a bsp split
for (face_t* f = p->faces; f; f = f->next)
{
if (f->contents == CONTENTS_DETAIL)
{
//Log("SelectPartition::got a detial surface, skipping...\n");
continue;
}
}
}
#endif
#ifdef HLCSG_HLBSP_SOLIDHINT
face_t *f;
for (f = p->faces; f; f = f->next)
{
#ifdef ZHLT_DETAILBRUSH
if (f->detaillevel != splitdetaillevel)
{
continue;
}
#endif
if (f->facestyle != face_discardable)
{
break;
}
}
if (!f)
{
continue; // this surface is discardable
// if all surfaces are discardable, this will become a leaf node
}
#endif
#ifdef ZHLT_DETAILBRUSH
if (p->detaillevel != splitdetaillevel)
{
continue;
}
#endif
i++;
bestsurface = p;
}
}
if (i == 0)
{
return NULL; // this is a leafnode
}
#ifndef HLCSG_HLBSP_SOLIDHINT // although there is only one undiscardable surface, maybe discardable surfaces should split first.
if (i == 1)
{
return bestsurface; // this is a final split
}
#endif
#endif
#ifdef HLBSP_ChooseMidPlane_FIX
if (usemidsplit)
{
surface_t *s = ChooseMidPlaneFromList(surfaces,
#ifdef HLBSP_MAXNODESIZE_SKYBOX
validmins, validmaxs
#else
node->mins, node->maxs
#endif
#ifdef ZHLT_DETAILBRUSH
, splitdetaillevel
#endif
);
if (s != NULL)
return s;
}
return ChoosePlaneFromList(surfaces, node->mins, node->maxs
#ifdef ZHLT_DETAILBRUSH
, splitdetaillevel
#endif
);
#else
if (usemidsplit)
{
// do fast way for clipping hull
return ChooseMidPlaneFromList(surfaces,
#ifdef HLBSP_MAXNODESIZE_SKYBOX
validmins, validmaxs
#else
node->mins, node->maxs
#endif
#ifdef ZHLT_DETAILBRUSH
, splitdetaillevel
#endif
);
}
else
{
// do slow way to save poly splits for drawing hull
return ChoosePlaneFromList(surfaces, node->mins, node->maxs
#ifdef ZHLT_DETAILBRUSH
, splitdetaillevel
#endif
);
}
#endif
}
// =====================================================================================
// CalcSurfaceInfo
// Calculates the bounding box
// =====================================================================================
static void CalcSurfaceInfo(surface_t* surf)
{
int i;
int j;
face_t* f;
hlassume(surf->faces != NULL, assume_ValidPointer); // "CalcSurfaceInfo() surface without a face"
//
// calculate a bounding box
//
for (i = 0; i < 3; i++)
{
surf->mins[i] = 99999;
surf->maxs[i] = -99999;
}
#ifdef ZHLT_DETAILBRUSH
surf->detaillevel = -1;
#endif
for (f = surf->faces; f; f = f->next)
{
if (f->contents >= 0)
{
Error("Bad contents");
}
for (i = 0; i < f->numpoints; i++)
{
for (j = 0; j < 3; j++)
{
if (f->pts[i][j] < surf->mins[j])
{
surf->mins[j] = f->pts[i][j];
}
if (f->pts[i][j] > surf->maxs[j])
{
surf->maxs[j] = f->pts[i][j];
}
}
}
#ifdef ZHLT_DETAILBRUSH
if (surf->detaillevel == -1 || f->detaillevel < surf->detaillevel)
{
surf->detaillevel = f->detaillevel;
}
#endif
}
}
#ifdef ZHLT_DETAILBRUSH
#ifdef HLCSG_HLBSP_SOLIDHINT
void FixDetaillevelForDiscardable (node_t *node, int detaillevel)
{
// when we move on to the next detaillevel, some discardable faces of previous detail level remain not on node (because they are discardable). remove them now
surface_t *s, **psnext;
face_t *f, **pfnext;
for (psnext = &node->surfaces; s = *psnext, s != NULL; )
{
if (s->onnode)
{
psnext = &s->next;
continue;
}
hlassume (s->faces, assume_ValidPointer);
for (pfnext = &s->faces; f = *pfnext, f != NULL; )
{
if (detaillevel == -1 || f->detaillevel < detaillevel)
{
*pfnext = f->next;
FreeFace (f);
}
else
{
pfnext = &f->next;
}
}
if (!s->faces)
{
*psnext = s->next;
FreeSurface (s);
}
else
{
psnext = &s->next;
CalcSurfaceInfo (s);
hlassume (!(detaillevel == -1 || s->detaillevel < detaillevel), assume_first);
}
}
}
#endif
#endif
// =====================================================================================
// DivideSurface
// =====================================================================================
static void DivideSurface(surface_t* in, const dplane_t* const split, surface_t** front, surface_t** back)
{
face_t* facet;
face_t* next;
face_t* frontlist;
face_t* backlist;
face_t* frontfrag;
face_t* backfrag;
surface_t* news;
dplane_t* inplane;
inplane = &g_dplanes[in->planenum];
// parallel case is easy
if (inplane->normal[0] == split->normal[0]
&& inplane->normal[1] == split->normal[1]
&& inplane->normal[2] == split->normal[2])
{
if (inplane->dist > split->dist)
{
*front = in;
*back = NULL;
}
else if (inplane->dist < split->dist)
{
*front = NULL;
*back = in;
}
else
{ // split the surface into front and back
frontlist = NULL;
backlist = NULL;
for (facet = in->faces; facet; facet = next)
{
next = facet->next;
if (facet->planenum & 1)
{
facet->next = backlist;
backlist = facet;
}
else
{
facet->next = frontlist;
frontlist = facet;
}
}
goto makesurfs;
}
return;
}
// do a real split. may still end up entirely on one side
// OPTIMIZE: use bounding box for fast test
frontlist = NULL;
backlist = NULL;
for (facet = in->faces; facet; facet = next)
{
next = facet->next;
SplitFace(facet, split, &frontfrag, &backfrag);
if (frontfrag)
{
frontfrag->next = frontlist;
frontlist = frontfrag;
}
if (backfrag)
{
backfrag->next = backlist;
backlist = backfrag;
}
}
// if nothing actually got split, just move the in plane
makesurfs:
#ifdef HLBSP_REMOVECOLINEARPOINTS
if (frontlist == NULL && backlist == NULL)
{
*front = NULL;
*back = NULL;
return;
}
#endif
if (frontlist == NULL)
{
*front = NULL;
*back = in;
in->faces = backlist;
return;
}
if (backlist == NULL)
{
*front = in;
*back = NULL;
in->faces = frontlist;
return;
}
// stuff got split, so allocate one new surface and reuse in
news = AllocSurface();
*news = *in;
news->faces = backlist;
*back = news;
in->faces = frontlist;
*front = in;
// recalc bboxes and flags
CalcSurfaceInfo(news);
CalcSurfaceInfo(in);
}
// =====================================================================================
// SplitNodeSurfaces
// =====================================================================================
static void SplitNodeSurfaces(surface_t* surfaces, const node_t* const node)
{
surface_t* p;
surface_t* next;
surface_t* frontlist;
surface_t* backlist;
surface_t* frontfrag;
surface_t* backfrag;
dplane_t* splitplane;
splitplane = &g_dplanes[node->planenum];
frontlist = NULL;
backlist = NULL;
for (p = surfaces; p; p = next)
{
next = p->next;
DivideSurface(p, splitplane, &frontfrag, &backfrag);
if (frontfrag)
{
if (!frontfrag->faces)
{
Error("surface with no faces");
}
frontfrag->next = frontlist;
frontlist = frontfrag;
}
if (backfrag)
{
if (!backfrag->faces)
{
Error("surface with no faces");
}
backfrag->next = backlist;
backlist = backfrag;
}
}
node->children[0]->surfaces = frontlist;
node->children[1]->surfaces = backlist;
}
#ifdef ZHLT_DETAILBRUSH
static void SplitNodeBrushes (brush_t *brushes, const node_t *node)
{
brush_t *frontlist, *frontfrag;
brush_t *backlist, *backfrag;
brush_t *b, *next;
const dplane_t *splitplane;
frontlist = NULL;
backlist = NULL;
splitplane = &g_dplanes[node->planenum];
for (b = brushes; b; b = next)
{
next = b->next;
SplitBrush (b, splitplane, &frontfrag, &backfrag);
if (frontfrag)
{
frontfrag->next = frontlist;
frontlist = frontfrag;
}
if (backfrag)
{
backfrag->next = backlist;
backlist = backfrag;
}
}
node->children[0]->detailbrushes = frontlist;
node->children[1]->detailbrushes = backlist;
}
#endif
// =====================================================================================
// RankForContents
// =====================================================================================
static int RankForContents(const int contents)
{
//Log("SolidBSP::RankForContents - contents type is %i ",contents);
switch (contents)
{
#ifdef ZHLT_NULLTEX // AJM
#ifndef HLCSG_HLBSP_CONTENTSNULL_FIX
case CONTENTS_NULL:
//Log("(null)\n");
//return 13;
return -2;
#endif
#endif
case CONTENTS_EMPTY:
//Log("(empty)\n");
return 0;
case CONTENTS_WATER:
//Log("(water)\n");
return 1;
case CONTENTS_TRANSLUCENT:
//Log("(traslucent)\n");
return 2;
case CONTENTS_CURRENT_0:
//Log("(current_0)\n");
return 3;
case CONTENTS_CURRENT_90:
//Log("(current_90)\n");
return 4;
case CONTENTS_CURRENT_180:
//Log("(current_180)\n");
return 5;
case CONTENTS_CURRENT_270:
//Log("(current_270)\n");
return 6;
case CONTENTS_CURRENT_UP:
//Log("(current_up)\n");
return 7;
case CONTENTS_CURRENT_DOWN:
//Log("(current_down)\n");
return 8;
case CONTENTS_SLIME:
//Log("(slime)\n");
return 9;
case CONTENTS_LAVA:
//Log("(lava)\n");
return 10;
case CONTENTS_SKY:
//Log("(sky)\n");
return 11;
case CONTENTS_SOLID:
//Log("(solid)\n");
return 12;
#ifdef ZHLT_DETAIL
case CONTENTS_DETAIL:
return 13;
//Log("(detail)\n");
#endif
default:
hlassert(false);
Error("RankForContents: bad contents %i", contents);
}
return -1;
}
// =====================================================================================
// ContentsForRank
// =====================================================================================
static int ContentsForRank(const int rank)
{
switch (rank)
{
#ifdef ZHLT_NULLTEX // AJM
#ifndef HLCSG_HLBSP_CONTENTSNULL_FIX
case -2:
return CONTENTS_NULL; // has at leat one face with null
#endif
#endif
case -1:
#ifdef HLCSG_HLBSP_ALLOWEMPTYENTITY
return CONTENTS_EMPTY;
#else
return CONTENTS_SOLID; // no faces at all
#endif
case 0:
return CONTENTS_EMPTY;
case 1:
return CONTENTS_WATER;
case 2:
return CONTENTS_TRANSLUCENT;
case 3:
return CONTENTS_CURRENT_0;
case 4:
return CONTENTS_CURRENT_90;
case 5:
return CONTENTS_CURRENT_180;
case 6:
return CONTENTS_CURRENT_270;
case 7:
return CONTENTS_CURRENT_UP;
case 8:
return CONTENTS_CURRENT_DOWN;
case 9:
return CONTENTS_SLIME;
case 10:
return CONTENTS_LAVA;
case 11:
return CONTENTS_SKY;
case 12:
return CONTENTS_SOLID;
#ifdef ZHLT_DETAIL // AJM
case 13:
return CONTENTS_DETAIL;
#endif
default:
hlassert(false);
Error("ContentsForRank: bad rank %i", rank);
}
return -1;
}
// =====================================================================================
// FreeLeafSurfs
// =====================================================================================
static void FreeLeafSurfs(node_t* leaf)
{
surface_t* surf;
surface_t* snext;
face_t* f;
face_t* fnext;
for (surf = leaf->surfaces; surf; surf = snext)
{
snext = surf->next;
for (f = surf->faces; f; f = fnext)
{
fnext = f->next;
FreeFace(f);
}
FreeSurface(surf);
}
leaf->surfaces = NULL;
}
#ifdef ZHLT_DETAILBRUSH
static void FreeLeafBrushes (node_t *leaf)
{
brush_t *b, *next;
for (b = leaf->detailbrushes; b; b = next)
{
next = b->next;
FreeBrush (b);
}
leaf->detailbrushes = NULL;
}
#endif
// =====================================================================================
// LinkLeafFaces
// Determines the contents of the leaf and creates the final list of original faces
// that have some fragment inside this leaf
// =====================================================================================
#ifdef HLBSP_MAX_LEAF_FACES
#define MAX_LEAF_FACES 16384
#else
#define MAX_LEAF_FACES 1024
#endif
#ifdef HLBSP_WARNMIXEDCONTENTS
const char* ContentsToString(int contents)
{
switch (contents)
{
case CONTENTS_EMPTY:
return "EMPTY";
case CONTENTS_SOLID:
return "SOLID";
case CONTENTS_WATER:
return "WATER";
case CONTENTS_SLIME:
return "SLIME";
case CONTENTS_LAVA:
return "LAVA";
case CONTENTS_SKY:
return "SKY";
case CONTENTS_CURRENT_0:
return "CURRENT_0";
case CONTENTS_CURRENT_90:
return "CURRENT_90";
case CONTENTS_CURRENT_180:
return "CURRENT_180";
case CONTENTS_CURRENT_270:
return "CURRENT_270";
case CONTENTS_CURRENT_UP:
return "CURRENT_UP";
case CONTENTS_CURRENT_DOWN:
return "CURRENT_DOWN";
case CONTENTS_TRANSLUCENT:
return "TRANSLUCENT";
default:
return "UNKNOWN";
}
}
#endif
static void LinkLeafFaces(surface_t* planelist, node_t* leafnode)
{
face_t* f;
surface_t* surf;
int rank, r;
#ifndef ZHLT_DETAILBRUSH
int nummarkfaces;
face_t* markfaces[MAX_LEAF_FACES];
leafnode->faces = NULL;
leafnode->planenum = -1;
#endif
rank = -1;
for (surf = planelist; surf; surf = surf->next)
{
#ifdef ZHLT_DETAILBRUSH
if (!surf->onnode)
{
continue;
}
#endif
for (f = surf->faces; f; f = f->next)
{
if ((f->contents == CONTENTS_HINT))
{
f->contents = CONTENTS_EMPTY;
}
#ifdef ZHLT_DETAILBRUSH
if (f->detaillevel)
{
continue;
}
#endif
r = RankForContents(f->contents);
if (r > rank)
{
rank = r;
}
}
}
#ifdef HLBSP_WARNMIXEDCONTENTS
for (surf = planelist; surf; surf = surf->next)
{
#ifdef ZHLT_DETAILBRUSH
if (!surf->onnode)
{
continue;
}
#endif
for (f = surf->faces; f; f = f->next)
{
#ifdef ZHLT_DETAILBRUSH
if (f->detaillevel)
{
continue;
}
#endif
r = RankForContents(f->contents);
if (r != rank)
break;
}
if (f)
break;
}
if (surf)
{
entity_t *ent = EntityForModel (g_nummodels - 1);
if (g_nummodels - 1 != 0 && ent == &g_entities[0])
{
ent = NULL;
}
Warning ("Ambiguous leafnode content ( %s and %s ) at (%.0f,%.0f,%.0f)-(%.0f,%.0f,%.0f) in hull %d of model %d (entity: classname \"%s\", origin \"%s\", targetname \"%s\")",
ContentsToString (ContentsForRank(r)), ContentsToString (ContentsForRank(rank)),
leafnode->mins[0], leafnode->mins[1], leafnode->mins[2], leafnode->maxs[0], leafnode->maxs[1], leafnode->maxs[2],
g_hullnum, g_nummodels - 1,
(ent? ValueForKey (ent, "classname"): "unknown"),
(ent? ValueForKey (ent, "origin"): "unknown"),
(ent? ValueForKey (ent, "targetname"): "unknown"));
for (surface_t *surf2 = planelist; surf2; surf2 = surf2->next)
{
for (face_t *f2 = surf2->faces; f2; f2 = f2->next)
{
Developer (DEVELOPER_LEVEL_SPAM, "content = %d plane = %d normal = (%g,%g,%g)\n", f2->contents, f2->planenum,
g_dplanes[f2->planenum].normal[0], g_dplanes[f2->planenum].normal[1], g_dplanes[f2->planenum].normal[2]);
for (int i = 0; i < f2->numpoints; i++)
{
Developer (DEVELOPER_LEVEL_SPAM, "(%g,%g,%g)\n", f2->pts[i][0], f2->pts[i][1], f2->pts[i][2]);
}
}
}
}
#endif
leafnode->contents = ContentsForRank(rank);
#ifndef ZHLT_DETAILBRUSH
if (leafnode->contents != CONTENTS_SOLID)
{
nummarkfaces = 0;
for (surf = leafnode->surfaces; surf; surf = surf->next)
{
for (f = surf->faces; f; f = f->next)
{
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->original == NULL)
{
continue;
}
#endif
hlassume(nummarkfaces < MAX_LEAF_FACES, assume_MAX_LEAF_FACES);
markfaces[nummarkfaces++] = f->original;
}
}
markfaces[nummarkfaces] = NULL; // end marker
nummarkfaces++;
leafnode->markfaces = (face_t**)malloc(nummarkfaces * sizeof(*leafnode->markfaces));
memcpy(leafnode->markfaces, markfaces, nummarkfaces * sizeof(*leafnode->markfaces));
}
FreeLeafSurfs(leafnode);
leafnode->surfaces = NULL;
#endif
}
#ifdef ZHLT_DETAILBRUSH
static void MakeLeaf (node_t *leafnode)
{
int nummarkfaces;
face_t *markfaces[MAX_LEAF_FACES + 1];
surface_t *surf;
face_t *f;
leafnode->planenum = -1;
leafnode->iscontentsdetail = leafnode->detailbrushes != NULL;
FreeLeafBrushes (leafnode);
leafnode->detailbrushes = NULL;
#ifdef HLBSP_DETAILBRUSH_CULL
if (leafnode->boundsbrush)
{
FreeBrush (leafnode->boundsbrush);
}
leafnode->boundsbrush = NULL;
#endif
if (!(leafnode->isportalleaf && leafnode->contents == CONTENTS_SOLID))
{
nummarkfaces = 0;
for (surf = leafnode->surfaces; surf; surf = surf->next)
{
if (!surf->onnode)
{
continue;
}
#ifdef HLCSG_HLBSP_SOLIDHINT
if (!surf->onnode)
{
continue;
}
#endif
for (f = surf->faces; f; f = f->next)
{
if (f->original == NULL)
{ // because it is not on node or its content is solid
continue;
}
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->original == NULL)
{
continue;
}
#endif
hlassume(nummarkfaces < MAX_LEAF_FACES, assume_MAX_LEAF_FACES);
markfaces[nummarkfaces++] = f->original;
}
}
markfaces[nummarkfaces] = NULL; // end marker
nummarkfaces++;
leafnode->markfaces = (face_t**)malloc(nummarkfaces * sizeof(*leafnode->markfaces));
memcpy(leafnode->markfaces, markfaces, nummarkfaces * sizeof(*leafnode->markfaces));
}
FreeLeafSurfs(leafnode);
leafnode->surfaces = NULL;
}
#endif
// =====================================================================================
// MakeNodePortal
// Create the new portal by taking the full plane winding for the cutting plane and
// clipping it by all of the planes from the other portals.
// Each portal tracks the node that created it, so unused nodes can be removed later.
// =====================================================================================
static void MakeNodePortal(node_t* node)
{
portal_t* new_portal;
portal_t* p;
dplane_t* plane;
dplane_t clipplane;
Winding * w;
int side = 0;
plane = &g_dplanes[node->planenum];
w = new Winding(*plane);
new_portal = AllocPortal();
new_portal->plane = *plane;
new_portal->onnode = node;
for (p = node->portals; p; p = p->next[side])
{
clipplane = p->plane;
if (p->nodes[0] == node)
{
side = 0;
}
else if (p->nodes[1] == node)
{
clipplane.dist = -clipplane.dist;
VectorSubtract(vec3_origin, clipplane.normal, clipplane.normal);
side = 1;
}
else
{
Error("MakeNodePortal: mislinked portal");
}
w->Clip(clipplane, true);
#ifdef ZHLT_WINDING_RemoveColinearPoints_VL
if (w->m_NumPoints == 0)
#else
if (!w)
#endif
{
#ifdef ZHLT_WINDING_RemoveColinearPoints_VL
Developer (DEVELOPER_LEVEL_WARNING,
#else
Warning(
#endif
"MakeNodePortal:new portal was clipped away from node@(%.0f,%.0f,%.0f)-(%.0f,%.0f,%.0f)",
node->mins[0], node->mins[1], node->mins[2], node->maxs[0], node->maxs[1], node->maxs[2]);
FreePortal(new_portal);
return;
}
}
new_portal->winding = w;
AddPortalToNodes(new_portal, node->children[0], node->children[1]);
}
// =====================================================================================
// SplitNodePortals
// Move or split the portals that bound node so that the node's children have portals instead of node.
// =====================================================================================
static void SplitNodePortals(node_t *node)
{
portal_t* p;
portal_t* next_portal;
portal_t* new_portal;
node_t* f;
node_t* b;
node_t* other_node;
int side = 0;
dplane_t* plane;
Winding* frontwinding;
Winding* backwinding;
plane = &g_dplanes[node->planenum];
f = node->children[0];
b = node->children[1];
for (p = node->portals; p; p = next_portal)
{
if (p->nodes[0] == node)
{
side = 0;
}
else if (p->nodes[1] == node)
{
side = 1;
}
else
{
Error("SplitNodePortals: mislinked portal");
}
next_portal = p->next[side];
other_node = p->nodes[!side];
RemovePortalFromNode(p, p->nodes[0]);
RemovePortalFromNode(p, p->nodes[1]);
// cut the portal into two portals, one on each side of the cut plane
p->winding->Divide(*plane, &frontwinding, &backwinding);
#ifdef ZHLT_WINDING_RemoveColinearPoints_VL
if (!frontwinding && !backwinding)
{
continue;
}
#endif
if (!frontwinding)
{
if (side == 0)
{
AddPortalToNodes(p, b, other_node);
}
else
{
AddPortalToNodes(p, other_node, b);
}
continue;
}
if (!backwinding)
{
if (side == 0)
{
AddPortalToNodes(p, f, other_node);
}
else
{
AddPortalToNodes(p, other_node, f);
}
continue;
}
// the winding is split
new_portal = AllocPortal();
*new_portal = *p;
new_portal->winding = backwinding;
delete p->winding;
p->winding = frontwinding;
if (side == 0)
{
AddPortalToNodes(p, f, other_node);
AddPortalToNodes(new_portal, b, other_node);
}
else
{
AddPortalToNodes(p, other_node, f);
AddPortalToNodes(new_portal, other_node, b);
}
}
node->portals = NULL;
}
// =====================================================================================
// CalcNodeBounds
// Determines the boundaries of a node by minmaxing all the portal points, whcih
// completely enclose the node.
// Returns true if the node should be midsplit.(very large)
// =====================================================================================
static bool CalcNodeBounds(node_t* node
#ifdef HLBSP_MAXNODESIZE_SKYBOX
, vec3_t validmins, vec3_t validmaxs
#endif
)
{
int i;
int j;
vec_t v;
portal_t* p;
portal_t* next_portal;
int side = 0;
#ifdef ZHLT_DETAILBRUSH
if (node->isdetail)
{
return false;
}
#endif
#ifdef ZHLT_LARGERANGE
node->mins[0] = node->mins[1] = node->mins[2] = BOGUS_RANGE;
node->maxs[0] = node->maxs[1] = node->maxs[2] = -BOGUS_RANGE;
#else
node->mins[0] = node->mins[1] = node->mins[2] = 9999;
node->maxs[0] = node->maxs[1] = node->maxs[2] = -9999;
#endif
for (p = node->portals; p; p = next_portal)
{
if (p->nodes[0] == node)
{
side = 0;
}
else if (p->nodes[1] == node)
{
side = 1;
}
else
{
Error("CalcNodeBounds: mislinked portal");
}
next_portal = p->next[side];
for (i = 0; i < p->winding->m_NumPoints; i++)
{
for (j = 0; j < 3; j++)
{
v = p->winding->m_Points[i][j];
if (v < node->mins[j])
{
node->mins[j] = v;
}
if (v > node->maxs[j])
{
node->maxs[j] = v;
}
}
}
}
#ifdef ZHLT_DETAILBRUSH
if (node->isportalleaf)
{
return false;
}
#endif
#ifdef HLBSP_MAXNODESIZE_SKYBOX
for (i = 0; i < 3; i++)
{
validmins[i] = qmax (node->mins[i], -(ENGINE_ENTITY_RANGE + g_maxnode_size));
validmaxs[i] = qmin (node->maxs[i], ENGINE_ENTITY_RANGE + g_maxnode_size);
}
for (i = 0; i < 3; i++)
{
if (validmaxs[i] - validmins[i] <= ON_EPSILON)
{
return false;
}
}
for (i = 0; i < 3; i++)
{
if (validmaxs[i] - validmins[i] > g_maxnode_size + ON_EPSILON)
{
return true;
}
}
#else
for (i = 0; i < 3; i++)
{
if (node->maxs[i] - node->mins[i] > g_maxnode_size)
{
return true;
}
}
#endif
return false;
}
// =====================================================================================
// CopyFacesToNode
// Do a final merge attempt, then subdivide the faces to surface cache size if needed.
// These are final faces that will be drawable in the game.
// Copies of these faces are further chopped up into the leafs, but they will reference these originals.
// =====================================================================================
static void CopyFacesToNode(node_t* node, surface_t* surf)
{
face_t** prevptr;
face_t* f;
face_t* newf;
// merge as much as possible
MergePlaneFaces(surf);
// subdivide large faces
prevptr = &surf->faces;
while (1)
{
f = *prevptr;
if (!f)
{
break;
}
SubdivideFace(f, prevptr);
f = *prevptr;
prevptr = &f->next;
}
// copy the faces to the node, and consider them the originals
node->surfaces = NULL;
node->faces = NULL;
for (f = surf->faces; f; f = f->next)
{
#ifdef HLCSG_HLBSP_SOLIDHINT
if (f->facestyle == face_discardable)
{
continue;
}
#endif
if (f->contents != CONTENTS_SOLID)
{
newf = AllocFace();
*newf = *f;
f->original = newf;
newf->next = node->faces;
node->faces = newf;
}
}
}
// =====================================================================================
// BuildBspTree_r
// =====================================================================================
static void BuildBspTree_r(node_t* node)
{
surface_t* split;
bool midsplit;
surface_t* allsurfs;
#ifdef HLBSP_MAXNODESIZE_SKYBOX
vec3_t validmins, validmaxs;
#endif
midsplit = CalcNodeBounds(node
#ifdef HLBSP_MAXNODESIZE_SKYBOX
, validmins, validmaxs
#endif
);
#ifdef HLBSP_DETAILBRUSH_CULL
if (node->boundsbrush)
{
CalcBrushBounds (node->boundsbrush, node->loosemins, node->loosemaxs);
}
else
{
VectorFill (node->loosemins, BOGUS_RANGE);
VectorFill (node->loosemaxs, -BOGUS_RANGE);
}
#endif
#ifdef ZHLT_DETAILBRUSH
int splitdetaillevel = CalcSplitDetaillevel (node);
#ifdef HLCSG_HLBSP_SOLIDHINT
FixDetaillevelForDiscardable (node, splitdetaillevel);
#endif
#endif
split = SelectPartition(node->surfaces, node, midsplit
#ifdef ZHLT_DETAILBRUSH
, splitdetaillevel
#endif
#ifdef HLBSP_MAXNODESIZE_SKYBOX
, validmins, validmaxs
#endif
);
#ifdef ZHLT_DETAILBRUSH
if (!node->isdetail && (!split || split->detaillevel > 0))
{
node->isportalleaf = true;
LinkLeafFaces (node->surfaces, node); // set contents
if (node->contents == CONTENTS_SOLID)
{
split = NULL;
}
}
else
{
node->isportalleaf = false;
}
#endif
if (!split)
{ // this is a leaf node
#ifdef ZHLT_DETAILBRUSH
MakeLeaf (node);
#else
node->planenum = PLANENUM_LEAF;
LinkLeafFaces(node->surfaces, node);
#endif
return;
}
// these are final polygons
split->onnode = node; // can't use again
allsurfs = node->surfaces;
node->planenum = split->planenum;
node->faces = NULL;
CopyFacesToNode(node, split);
node->children[0] = AllocNode();
node->children[1] = AllocNode();
#ifdef ZHLT_DETAILBRUSH
node->children[0]->isdetail = split->detaillevel > 0;
node->children[1]->isdetail = split->detaillevel > 0;
#endif
// split all the polysurfaces into front and back lists
SplitNodeSurfaces(allsurfs, node);
#ifdef ZHLT_DETAILBRUSH
SplitNodeBrushes (node->detailbrushes, node);
#ifdef HLBSP_DETAILBRUSH_CULL
if (node->boundsbrush)
{
for (int k = 0; k < 2; k++)
{
dplane_t p;
brush_t *copy, *front, *back;
if (k == 0)
{ // front child
VectorCopy (g_dplanes[split->planenum].normal, p.normal);
p.dist = g_dplanes[split->planenum].dist - BOUNDS_EXPANSION;
}
else
{ // back child
VecSubtractVector (0, g_dplanes[split->planenum].normal, p.normal);
p.dist = -g_dplanes[split->planenum].dist - BOUNDS_EXPANSION;
}
copy = NewBrushFromBrush (node->boundsbrush);
SplitBrush (copy, &p, &front, &back);
if (back)
{
FreeBrush (back);
}
if (!front)
{
Warning ("BuildBspTree_r: bounds was clipped away at (%f,%f,%f)-(%f,%f,%f).", node->loosemins[0], node->loosemins[1], node->loosemins[2], node->loosemaxs[0], node->loosemaxs[1], node->loosemaxs[2]);
}
node->children[k]->boundsbrush = front;
}
FreeBrush (node->boundsbrush);
}
node->boundsbrush = NULL;
#endif
#endif
#ifdef ZHLT_DETAILBRUSH
if (!split->detaillevel)
{
MakeNodePortal (node);
SplitNodePortals (node);
}
#else
// create the portal that seperates the two children
MakeNodePortal(node);
// carve the portals on the boundaries of the node
SplitNodePortals(node);
#endif
// recursively do the children
BuildBspTree_r(node->children[0]);
BuildBspTree_r(node->children[1]);
UpdateStatus();
}
// =====================================================================================
// SolidBSP
// Takes a chain of surfaces plus a split type, and returns a bsp tree with faces
// off the nodes.
// The original surface chain will be completely freed.
// =====================================================================================
node_t* SolidBSP(const surfchain_t* const surfhead,
#ifdef ZHLT_DETAILBRUSH
brush_t *detailbrushes,
#endif
bool report_progress)
{
node_t* headnode;
ResetStatus(report_progress);
double start_time = I_FloatTime();
if(report_progress)
{
Log("SolidBSP [hull %d] ",g_hullnum);
}
else
{
Verbose("----- SolidBSP -----\n");
}
headnode = AllocNode();
headnode->surfaces = surfhead->surfaces;
#ifdef ZHLT_DETAILBRUSH
headnode->detailbrushes = detailbrushes;
headnode->isdetail = false;
#ifdef HLBSP_DETAILBRUSH_CULL
vec3_t brushmins, brushmaxs;
VectorAddVec (surfhead->mins, -SIDESPACE, brushmins);
VectorAddVec (surfhead->maxs, SIDESPACE, brushmaxs);
headnode->boundsbrush = BrushFromBox (brushmins, brushmaxs);
#endif
#endif
#ifndef HLCSG_HLBSP_ALLOWEMPTYENTITY
if (!surfhead->surfaces)
{
// nothing at all to build
#ifdef ZHLT_DETAILBRUSH
headnode->isportalleaf = true;
headnode->iscontentsdetail = (headnode->detailbrushes != NULL);
FreeLeafBrushes (headnode->detailbrushes);
#endif
headnode->planenum = -1;
headnode->contents = CONTENTS_EMPTY;
return headnode;
}
#endif
// generate six portals that enclose the entire world
MakeHeadnodePortals(headnode, surfhead->mins, surfhead->maxs);
// recursively partition everything
BuildBspTree_r(headnode);
double end_time = I_FloatTime();
if(report_progress)
{
Log("%d (%.2f seconds)\n",++g_numProcessed,(end_time - start_time));
}
return headnode;
}
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