1169 lines
23 KiB
C
1169 lines
23 KiB
C
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#include "bsplib.h"
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#include "const.h"
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int c_nodes;
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int c_nonvis;
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int c_active_brushes;
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vec_t microvolume = 0.5f;
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#define PSIDE_FRONT 1
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#define PSIDE_BACK 2
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#define PSIDE_BOTH (PSIDE_FRONT|PSIDE_BACK)
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#define PSIDE_FACING 4
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void FindBrushInTree( node_t *node, int brushnum )
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{
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bspbrush_t *b;
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if( node->planenum == PLANENUM_LEAF )
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{
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for( b = node->brushlist; b; b = b->next )
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if( b->original->brushnum == brushnum )
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Msg ("here\n");
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return;
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}
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FindBrushInTree (node->children[0], brushnum);
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FindBrushInTree (node->children[1], brushnum);
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}
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//==================================================
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static void pw(winding_t *w)
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{
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int i;
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for (i=0 ; i<w->numpoints ; i++)
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Msg ("(%5.1f, %5.1f, %5.1f)\n",w->p[i][0], w->p[i][1],w->p[i][2]);
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}
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void PrintBrush (bspbrush_t *brush)
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{
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int i;
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Msg ("brush: %p\n", brush);
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for (i=0;i<brush->numsides ; i++)
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{
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pw(brush->sides[i].winding);
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Msg ("\n");
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}
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}
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/*
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==================
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BoundBrush
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Sets the mins/maxs based on the windings
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==================
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*/
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void BoundBrush (bspbrush_t *brush)
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{
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int i, j;
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winding_t *w;
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ClearBounds (brush->mins, brush->maxs);
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for (i=0 ; i<brush->numsides ; i++)
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{
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w = brush->sides[i].winding;
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if (!w)
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continue;
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for (j=0 ; j<w->numpoints ; j++)
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AddPointToBounds (w->p[j], brush->mins, brush->maxs);
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}
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}
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/*
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==================
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CreateBrushWindings
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==================
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*/
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void CreateBrushWindings (bspbrush_t *brush)
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{
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int i, j;
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winding_t *w;
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side_t *side;
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plane_t *plane;
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for (i=0 ; i<brush->numsides ; i++)
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{
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side = &brush->sides[i];
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plane = &mapplanes[side->planenum];
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w = BaseWindingForPlane (plane->normal, plane->dist);
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for (j=0 ; j<brush->numsides && w; j++)
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{
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if (i == j)
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continue;
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if (brush->sides[j].bevel)
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continue;
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plane = &mapplanes[brush->sides[j].planenum^1];
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ChopWindingInPlace (&w, plane->normal, plane->dist, 0); //CLIP_EPSILON);
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}
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side->winding = w;
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}
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BoundBrush (brush);
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}
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/*
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==================
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BrushFromBounds
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Creates a new axial brush
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==================
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*/
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bspbrush_t *BrushFromBounds( vec3_t mins, vec3_t maxs )
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{
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bspbrush_t *b;
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vec3_t normal;
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float dist;
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int i;
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b = AllocBrush( 6 );
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b->numsides = 6;
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for( i = 0; i < 3; i++ )
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{
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VectorClear( normal );
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normal[i] = 1;
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dist = maxs[i];
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b->sides[i].planenum = FindFloatPlane( normal, dist );
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normal[i] = -1;
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dist = -mins[i];
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b->sides[3+i].planenum = FindFloatPlane( normal, dist );
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}
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CreateBrushWindings( b );
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return b;
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}
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/*
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==================
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BrushVolume
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==================
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*/
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vec_t BrushVolume (bspbrush_t *brush)
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{
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int i;
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winding_t *w;
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vec3_t corner;
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vec_t d, area, volume;
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plane_t *plane;
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if (!brush)
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return 0;
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// grab the first valid point as the corner
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w = NULL;
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for (i=0 ; i<brush->numsides ; i++)
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{
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w = brush->sides[i].winding;
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if (w)
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break;
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}
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if (!w)
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return 0;
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VectorCopy (w->p[0], corner);
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// make tetrahedrons to all other faces
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volume = 0;
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for ( ; i<brush->numsides ; i++)
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{
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w = brush->sides[i].winding;
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if (!w)
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continue;
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plane = &mapplanes[brush->sides[i].planenum];
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d = -(DotProduct (corner, plane->normal) - plane->dist);
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area = WindingArea (w);
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volume += d*area;
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}
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volume /= 3;
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return volume;
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}
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/*
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================
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CountBrushList
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================
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*/
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int CountBrushList (bspbrush_t *brushes)
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{
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int c;
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c = 0;
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for ( ; brushes ; brushes = brushes->next)
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c++;
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return c;
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}
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/*
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================
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AllocTree
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================
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*/
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tree_t *AllocTree (void)
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{
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tree_t *tree;
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tree = Malloc(sizeof(*tree));
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ClearBounds (tree->mins, tree->maxs);
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return tree;
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}
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/*
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================
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AllocNode
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================
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*/
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node_t *AllocNode (void)
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{
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node_t *node;
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node = Malloc(sizeof(*node));
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return node;
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}
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/*
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================
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AllocBrush
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================
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*/
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bspbrush_t *AllocBrush (int numsides)
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{
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bspbrush_t *bb;
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int c;
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c = (int)&(((bspbrush_t *)0)->sides[numsides]);
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bb = malloc(c);
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memset (bb, 0, c);
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if (GetNumThreads() == 1) c_active_brushes++;
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return bb;
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}
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/*
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================
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FreeBrush
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================
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*/
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void FreeBrush (bspbrush_t *brushes)
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{
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int i;
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for (i=0 ; i<brushes->numsides ; i++)
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if (brushes->sides[i].winding)
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FreeWinding(brushes->sides[i].winding);
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free(brushes);
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if (GetNumThreads() == 1)
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c_active_brushes--;
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}
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/*
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================
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FreeBrushList
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================
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*/
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void FreeBrushList (bspbrush_t *brushes)
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{
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bspbrush_t *next;
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for ( ; brushes ; brushes = next)
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{
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next = brushes->next;
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FreeBrush (brushes);
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}
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}
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/*
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==================
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CopyBrush
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Duplicates the brush, the sides, and the windings
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==================
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*/
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bspbrush_t *CopyBrush (bspbrush_t *brush)
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{
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bspbrush_t *newbrush;
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int size;
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int i;
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size = (int)&(((bspbrush_t *)0)->sides[brush->numsides]);
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newbrush = AllocBrush (brush->numsides);
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memcpy (newbrush, brush, size);
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for (i=0 ; i<brush->numsides ; i++)
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{
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if (brush->sides[i].winding)
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newbrush->sides[i].winding = CopyWinding (brush->sides[i].winding);
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}
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return newbrush;
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}
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//========================================================
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/*
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==============
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Q_BoxOnPlaneSide
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Returns PSIDE_FRONT, PSIDE_BACK, or PSIDE_BOTH
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==============
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*/
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int Q_BoxOnPlaneSide (vec3_t mins, vec3_t maxs, plane_t *plane)
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{
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int side;
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int i;
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vec3_t corners[2];
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vec_t dist1, dist2;
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// axial planes are easy
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if (plane->type < 3)
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{
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side = 0;
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if (maxs[plane->type] > plane->dist+EQUAL_EPSILON)
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side |= PSIDE_FRONT;
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if (mins[plane->type] < plane->dist-EQUAL_EPSILON)
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side |= PSIDE_BACK;
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return side;
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}
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// create the proper leading and trailing verts for the box
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for (i=0 ; i<3 ; i++)
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{
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if (plane->normal[i] < 0)
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{
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corners[0][i] = mins[i];
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corners[1][i] = maxs[i];
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}
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else
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{
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corners[1][i] = mins[i];
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corners[0][i] = maxs[i];
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}
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}
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dist1 = DotProduct (plane->normal, corners[0]) - plane->dist;
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dist2 = DotProduct (plane->normal, corners[1]) - plane->dist;
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side = 0;
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if (dist1 >= EQUAL_EPSILON)
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side = PSIDE_FRONT;
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if (dist2 < EQUAL_EPSILON)
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side |= PSIDE_BACK;
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return side;
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}
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/*
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============
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QuickTestBrushToPlanenum
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============
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*/
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int QuickTestBrushToPlanenum (bspbrush_t *brush, int planenum, int *numsplits)
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{
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int i, num;
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plane_t *plane;
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int s;
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*numsplits = 0;
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// if the brush actually uses the planenum,
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// we can tell the side for sure
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for (i = 0; i < brush->numsides; i++)
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{
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num = brush->sides[i].planenum;
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if (num >= 0x10000) Sys_Error("bad planenum");
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if (num == planenum) return PSIDE_BACK|PSIDE_FACING;
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if (num == (planenum ^ 1) ) return PSIDE_FRONT|PSIDE_FACING;
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}
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// box on plane side
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plane = &mapplanes[planenum];
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s = Q_BoxOnPlaneSide (brush->mins, brush->maxs, plane);
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// if both sides, count the visible faces split
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if (s == PSIDE_BOTH)
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{
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*numsplits += 3;
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}
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return s;
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}
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/*
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============
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TestBrushToPlanenum
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============
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*/
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int TestBrushToPlanenum (bspbrush_t *brush, int planenum, int *numsplits, bool *hintsplit, int *epsilonbrush)
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{
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int i, j, num;
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plane_t *plane;
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int s;
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winding_t *w;
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vec_t d, d_front, d_back;
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int front, back;
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*numsplits = 0;
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*hintsplit = false;
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// if the brush actually uses the planenum,
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// we can tell the side for sure
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for (i=0 ; i<brush->numsides ; i++)
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{
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num = brush->sides[i].planenum;
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if (num >= 0x10000) Sys_Error("bad planenum");
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if (num == planenum) return PSIDE_BACK|PSIDE_FACING;
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if (num == (planenum ^ 1) ) return PSIDE_FRONT|PSIDE_FACING;
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}
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// box on plane side
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plane = &mapplanes[planenum];
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s = Q_BoxOnPlaneSide (brush->mins, brush->maxs, plane);
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if (s != PSIDE_BOTH)
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return s;
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// if both sides, count the visible faces split
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d_front = d_back = 0;
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for (i=0 ; i<brush->numsides ; i++)
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{
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if (brush->sides[i].texinfo == TEXINFO_NODE)
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continue; // on node, don't worry about splits
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if (!brush->sides[i].visible)
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continue; // we don't care about non-visible
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w = brush->sides[i].winding;
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if (!w)
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continue;
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front = back = 0;
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for (j=0 ; j<w->numpoints; j++)
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{
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d = DotProduct (w->p[j], plane->normal) - plane->dist;
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if (d > d_front)
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d_front = d;
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if (d < d_back)
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d_back = d;
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if (d > 0.1) // EQUAL_EPSILON)
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front = 1;
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if (d < -0.1) // EQUAL_EPSILON)
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back = 1;
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}
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if (front && back)
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{
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if ( !(brush->sides[i].surf & SURF_SKIP) )
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{
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(*numsplits)++;
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if (brush->sides[i].surf & SURF_HINT)
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*hintsplit = true;
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}
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}
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}
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if ( (d_front > 0.0 && d_front < 1.0)
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|| (d_back < 0.0 && d_back > -1.0) )
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(*epsilonbrush)++;
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#if 0
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if (*numsplits == 0)
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{ // didn't really need to be split
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if (front)
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s = PSIDE_FRONT;
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else if (back)
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s = PSIDE_BACK;
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else
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s = 0;
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}
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#endif
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return s;
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}
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//========================================================
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/*
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================
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WindingIsTiny
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Returns true if the winding would be crunched out of
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existance by the vertex snapping.
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================
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*/
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#define EDGE_LENGTH 0.2
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bool WindingIsTiny (winding_t *w)
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{
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#if 0
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if (WindingArea (w) < 1)
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return true;
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return false;
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#else
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int i, j;
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vec_t len;
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vec3_t delta;
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int edges;
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edges = 0;
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for (i=0 ; i<w->numpoints ; i++)
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{
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j = i == w->numpoints - 1 ? 0 : i+1;
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VectorSubtract (w->p[j], w->p[i], delta);
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len = VectorLength (delta);
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if (len > EDGE_LENGTH)
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{
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if (++edges == 3)
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return false;
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}
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}
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return true;
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#endif
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}
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|
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/*
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================
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WindingIsHuge
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Returns true if the winding still has one of the points
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from basewinding for plane
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================
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*/
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bool WindingIsHuge (winding_t *w)
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{
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int i, j;
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for (i=0 ; i<w->numpoints ; i++)
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{
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for (j=0 ; j<3 ; j++)
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if (w->p[i][j] < -BOGUS_RANGE || w->p[i][j] > BOGUS_RANGE)
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return true;
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}
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return false;
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}
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|
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//============================================================
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|
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/*
|
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================
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Leafnode
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================
|
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*/
|
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void LeafNode( node_t *node, bspbrush_t *brushes )
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{
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bspbrush_t *b;
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int i;
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node->planenum = PLANENUM_LEAF;
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node->contents = 0;
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for (b=brushes ; b ; b=b->next)
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{
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// if the brush is solid and all of its sides are on nodes,
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// it eats everything
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if (b->original->contents & CONTENTS_SOLID)
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{
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for (i=0 ; i<b->numsides ; i++)
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if (b->sides[i].texinfo != TEXINFO_NODE)
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break;
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if (i == b->numsides )
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{
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node->contents = CONTENTS_SOLID;
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break;
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}
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}
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node->contents |= b->original->contents;
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}
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node->brushlist = brushes;
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}
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|
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//============================================================
|
|
|
|
void CheckPlaneAgainstParents (int pnum, node_t *node)
|
|
{
|
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node_t *p;
|
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|
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for (p = node->parent; p; p = p->parent)
|
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{
|
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if (p->planenum == pnum)
|
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Sys_Error("Tried parent");
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}
|
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}
|
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|
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bool CheckPlaneAgainstVolume (int pnum, node_t *node)
|
|
{
|
|
bspbrush_t *front, *back;
|
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bool good;
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|
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SplitBrush (node->volume, pnum, &front, &back);
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|
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good = (front && back);
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|
|
if (front) FreeBrush (front);
|
|
if (back) FreeBrush (back);
|
|
|
|
return good;
|
|
}
|
|
|
|
/*
|
|
================
|
|
SelectSplitSide
|
|
|
|
Using a hueristic, choses one of the sides out of the brushlist
|
|
to partition the brushes with.
|
|
Returns NULL if there are no valid planes to split with..
|
|
================
|
|
*/
|
|
side_t *SelectSplitSide (bspbrush_t *brushes, node_t *node)
|
|
{
|
|
int value, bestvalue;
|
|
bspbrush_t *brush, *test;
|
|
side_t *side, *bestside;
|
|
int i, j, pass, numpasses;
|
|
int pnum;
|
|
int s;
|
|
int front, back, both, facing, splits;
|
|
int bsplits;
|
|
int bestsplits;
|
|
int epsilonbrush;
|
|
bool hintsplit;
|
|
|
|
bestside = NULL;
|
|
bestvalue = -99999;
|
|
bestsplits = 0;
|
|
|
|
// the search order goes: visible-structural, visible-detail,
|
|
// nonvisible-structural, nonvisible-detail.
|
|
// If any valid plane is available in a pass, no further
|
|
// passes will be tried.
|
|
numpasses = 4;
|
|
for (pass = 0 ; pass < numpasses ; pass++)
|
|
{
|
|
for (brush = brushes ; brush ; brush=brush->next)
|
|
{
|
|
if ( (pass & 1) && !(brush->original->contents & CONTENTS_DETAIL) )
|
|
continue;
|
|
if ( !(pass & 1) && (brush->original->contents & CONTENTS_DETAIL) )
|
|
continue;
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
{
|
|
side = brush->sides + i;
|
|
if (side->bevel)
|
|
continue; // never use a bevel as a spliter
|
|
if (!side->winding)
|
|
continue; // nothing visible, so it can't split
|
|
if (side->texinfo == TEXINFO_NODE)
|
|
continue; // allready a node splitter
|
|
if (side->tested)
|
|
continue; // we allready have metrics for this plane
|
|
if (side->surf & SURF_SKIP)
|
|
continue; // skip surfaces are never chosen
|
|
if ( side->visible ^ (pass<2) )
|
|
continue; // only check visible faces on first pass
|
|
|
|
pnum = side->planenum;
|
|
pnum &= ~1; // allways use positive facing plane
|
|
|
|
CheckPlaneAgainstParents (pnum, node);
|
|
|
|
if (!CheckPlaneAgainstVolume (pnum, node))
|
|
continue; // would produce a tiny volume
|
|
|
|
front = 0;
|
|
back = 0;
|
|
both = 0;
|
|
facing = 0;
|
|
splits = 0;
|
|
epsilonbrush = 0;
|
|
|
|
for (test = brushes ; test ; test=test->next)
|
|
{
|
|
s = TestBrushToPlanenum (test, pnum, &bsplits, &hintsplit, &epsilonbrush);
|
|
|
|
splits += bsplits;
|
|
if (bsplits && (s&PSIDE_FACING) )
|
|
Sys_Error("PSIDE_FACING with splits");
|
|
|
|
test->testside = s;
|
|
// if the brush shares this face, don't bother
|
|
// testing that facenum as a splitter again
|
|
if (s & PSIDE_FACING)
|
|
{
|
|
facing++;
|
|
for (j=0 ; j<test->numsides ; j++)
|
|
{
|
|
if ( (test->sides[j].planenum&~1) == pnum)
|
|
test->sides[j].tested = true;
|
|
}
|
|
}
|
|
if (s & PSIDE_FRONT)
|
|
front++;
|
|
if (s & PSIDE_BACK)
|
|
back++;
|
|
if (s == PSIDE_BOTH)
|
|
both++;
|
|
}
|
|
|
|
// give a value estimate for using this plane
|
|
|
|
value = 5*facing - 5*splits - abs(front-back);
|
|
// value = -5*splits;
|
|
// value = 5*facing - 5*splits;
|
|
if (mapplanes[pnum].type < 3)
|
|
value+=5; // axial is better
|
|
value -= epsilonbrush*1000; // avoid!
|
|
|
|
// never split a hint side except with another hint
|
|
if (hintsplit && !(side->surf & SURF_HINT) )
|
|
value = -9999999;
|
|
|
|
// save off the side test so we don't need
|
|
// to recalculate it when we actually seperate
|
|
// the brushes
|
|
if (value > bestvalue)
|
|
{
|
|
bestvalue = value;
|
|
bestside = side;
|
|
bestsplits = splits;
|
|
for (test = brushes ; test ; test=test->next)
|
|
test->side = test->testside;
|
|
}
|
|
}
|
|
}
|
|
|
|
// if we found a good plane, don't bother trying any
|
|
// other passes
|
|
if (bestside)
|
|
{
|
|
if (pass > 1)
|
|
{
|
|
if (GetNumThreads() == 1)
|
|
c_nonvis++;
|
|
}
|
|
if (pass > 0)
|
|
node->detail_seperator = true; // not needed for vis
|
|
break;
|
|
}
|
|
}
|
|
|
|
//
|
|
// clear all the tested flags we set
|
|
//
|
|
for (brush = brushes ; brush ; brush=brush->next)
|
|
{
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
brush->sides[i].tested = false;
|
|
}
|
|
|
|
return bestside;
|
|
}
|
|
|
|
|
|
/*
|
|
==================
|
|
BrushMostlyOnSide
|
|
|
|
==================
|
|
*/
|
|
int BrushMostlyOnSide (bspbrush_t *brush, plane_t *plane)
|
|
{
|
|
int i, j;
|
|
winding_t *w;
|
|
vec_t d, max;
|
|
int side;
|
|
|
|
max = 0;
|
|
side = PSIDE_FRONT;
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
{
|
|
w = brush->sides[i].winding;
|
|
if (!w)
|
|
continue;
|
|
for (j=0 ; j<w->numpoints ; j++)
|
|
{
|
|
d = DotProduct (w->p[j], plane->normal) - plane->dist;
|
|
if (d > max)
|
|
{
|
|
max = d;
|
|
side = PSIDE_FRONT;
|
|
}
|
|
if (-d > max)
|
|
{
|
|
max = -d;
|
|
side = PSIDE_BACK;
|
|
}
|
|
}
|
|
}
|
|
return side;
|
|
}
|
|
|
|
/*
|
|
================
|
|
SplitBrush
|
|
|
|
Generates two new brushes, leaving the original
|
|
unchanged
|
|
================
|
|
*/
|
|
void SplitBrush( bspbrush_t *brush, int planenum, bspbrush_t **front, bspbrush_t **back )
|
|
{
|
|
bspbrush_t *b[2];
|
|
int i, j;
|
|
winding_t *w, *cw[2], *midwinding;
|
|
plane_t *plane, *plane2;
|
|
side_t *s, *cs;
|
|
float d, d_front, d_back;
|
|
|
|
*front = *back = NULL;
|
|
plane = &mapplanes[planenum];
|
|
|
|
// check all points
|
|
d_front = d_back = 0;
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
{
|
|
w = brush->sides[i].winding;
|
|
if (!w)
|
|
continue;
|
|
for (j=0 ; j<w->numpoints ; j++)
|
|
{
|
|
d = DotProduct (w->p[j], plane->normal) - plane->dist;
|
|
if (d > 0 && d > d_front)
|
|
d_front = d;
|
|
if (d < 0 && d < d_back)
|
|
d_back = d;
|
|
}
|
|
}
|
|
if (d_front < 0.1) // EQUAL_EPSILON)
|
|
{ // only on back
|
|
*back = CopyBrush (brush);
|
|
return;
|
|
}
|
|
if (d_back > -0.1) // EQUAL_EPSILON)
|
|
{ // only on front
|
|
*front = CopyBrush (brush);
|
|
return;
|
|
}
|
|
|
|
// create a new winding from the split plane
|
|
|
|
w = BaseWindingForPlane (plane->normal, plane->dist);
|
|
for (i=0 ; i<brush->numsides && w ; i++)
|
|
{
|
|
plane2 = &mapplanes[brush->sides[i].planenum ^ 1];
|
|
ChopWindingInPlace (&w, plane2->normal, plane2->dist, 0); // EQUAL_EPSILON);
|
|
}
|
|
|
|
if (!w || WindingIsTiny (w) )
|
|
{ // the brush isn't really split
|
|
int side;
|
|
|
|
side = BrushMostlyOnSide (brush, plane);
|
|
if (side == PSIDE_FRONT)
|
|
*front = CopyBrush (brush);
|
|
if (side == PSIDE_BACK)
|
|
*back = CopyBrush (brush);
|
|
return;
|
|
}
|
|
|
|
if (WindingIsHuge (w)) Msg("WARNING: huge winding\n");
|
|
|
|
midwinding = w;
|
|
|
|
// split it for real
|
|
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
b[i] = AllocBrush (brush->numsides+1);
|
|
b[i]->original = brush->original;
|
|
}
|
|
|
|
// split all the current windings
|
|
|
|
for (i=0 ; i<brush->numsides ; i++)
|
|
{
|
|
s = &brush->sides[i];
|
|
w = s->winding;
|
|
if (!w)
|
|
continue;
|
|
ClipWindingEpsilon (w, plane->normal, plane->dist,
|
|
0 /*EQUAL_EPSILON*/, &cw[0], &cw[1]);
|
|
for (j=0 ; j<2 ; j++)
|
|
{
|
|
if (!cw[j])
|
|
continue;
|
|
#if 0
|
|
if (WindingIsTiny (cw[j]))
|
|
{
|
|
FreeWinding (cw[j]);
|
|
continue;
|
|
}
|
|
#endif
|
|
cs = &b[j]->sides[b[j]->numsides];
|
|
b[j]->numsides++;
|
|
*cs = *s;
|
|
// cs->planenum = s->planenum;
|
|
// cs->texinfo = s->texinfo;
|
|
// cs->visible = s->visible;
|
|
// cs->original = s->original;
|
|
cs->winding = cw[j];
|
|
cs->tested = false;
|
|
}
|
|
}
|
|
|
|
|
|
// see if we have valid polygons on both sides
|
|
|
|
for( i = 0; i < 2; i++)
|
|
{
|
|
BoundBrush (b[i]);
|
|
for (j=0 ; j<3 ; j++)
|
|
{
|
|
if (b[i]->mins[j] < -131072 || b[i]->maxs[j] > 131072)
|
|
break;
|
|
}
|
|
|
|
if (b[i]->numsides < 3 || j < 3)
|
|
{
|
|
FreeBrush (b[i]);
|
|
b[i] = NULL;
|
|
}
|
|
}
|
|
|
|
if ( !(b[0] && b[1]) )
|
|
{
|
|
if (b[0])
|
|
{
|
|
FreeBrush (b[0]);
|
|
*front = CopyBrush (brush);
|
|
}
|
|
if (b[1])
|
|
{
|
|
FreeBrush (b[1]);
|
|
*back = CopyBrush (brush);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// add the midwinding to both sides
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
cs = &b[i]->sides[b[i]->numsides];
|
|
b[i]->numsides++;
|
|
|
|
cs->planenum = planenum^i^1;
|
|
cs->texinfo = TEXINFO_NODE;
|
|
cs->visible = false;
|
|
cs->tested = false;
|
|
if (i==0)
|
|
cs->winding = CopyWinding (midwinding);
|
|
else
|
|
cs->winding = midwinding;
|
|
}
|
|
|
|
{
|
|
vec_t v1;
|
|
int i;
|
|
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
v1 = BrushVolume (b[i]);
|
|
if (v1 < 1.0)
|
|
{
|
|
FreeBrush (b[i]);
|
|
b[i] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
*front = b[0];
|
|
*back = b[1];
|
|
}
|
|
|
|
/*
|
|
================
|
|
SplitBrushList
|
|
================
|
|
*/
|
|
void SplitBrushList( bspbrush_t *brushes, node_t *node, bspbrush_t **front, bspbrush_t **back )
|
|
{
|
|
bspbrush_t *brush, *newbrush, *newbrush2;
|
|
int i, sides;
|
|
side_t *side;
|
|
|
|
*front = *back = NULL;
|
|
|
|
for( brush = brushes; brush; brush = brush->next )
|
|
{
|
|
sides = brush->side;
|
|
|
|
if( sides == PSIDE_BOTH )
|
|
{
|
|
// split into two brushes
|
|
SplitBrush( brush, node->planenum, &newbrush, &newbrush2 );
|
|
if( newbrush )
|
|
{
|
|
newbrush->next = *front;
|
|
*front = newbrush;
|
|
}
|
|
if( newbrush2 )
|
|
{
|
|
newbrush2->next = *back;
|
|
*back = newbrush2;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
newbrush = CopyBrush( brush );
|
|
|
|
// if the planenum is actualy a part of the brush
|
|
// find the plane and flag it as used so it won't be tried
|
|
// as a splitter again
|
|
if( sides & PSIDE_FACING )
|
|
{
|
|
for( i = 0; i < newbrush->numsides; i++ )
|
|
{
|
|
side = newbrush->sides + i;
|
|
if((side->planenum& ~1) == node->planenum )
|
|
side->texinfo = TEXINFO_NODE;
|
|
}
|
|
}
|
|
|
|
|
|
if( sides & PSIDE_FRONT )
|
|
{
|
|
newbrush->next = *front;
|
|
*front = newbrush;
|
|
continue;
|
|
}
|
|
if( sides & PSIDE_BACK )
|
|
{
|
|
newbrush->next = *back;
|
|
*back = newbrush;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
================
|
|
BuildTree_r
|
|
================
|
|
*/
|
|
node_t *BuildTree_r (node_t *node, bspbrush_t *brushes)
|
|
{
|
|
node_t *newnode;
|
|
side_t *bestside;
|
|
bspbrush_t *children[2];
|
|
int i;
|
|
|
|
if( GetNumThreads() == 1 )
|
|
c_nodes++;
|
|
|
|
// find the best plane to use as a splitter
|
|
bestside = SelectSplitSide( brushes, node );
|
|
if( !bestside )
|
|
{
|
|
// leaf node
|
|
node->side = NULL;
|
|
node->planenum = PLANENUM_LEAF;
|
|
LeafNode( node, brushes );
|
|
return node;
|
|
}
|
|
|
|
// this is a splitplane node
|
|
node->side = bestside;
|
|
node->planenum = bestside->planenum & ~1; // always use front facing
|
|
|
|
SplitBrushList( brushes, node, &children[0], &children[1] );
|
|
FreeBrushList( brushes );
|
|
|
|
// allocate children before recursing
|
|
for( i = 0; i < 2; i++ )
|
|
{
|
|
newnode = AllocNode();
|
|
newnode->parent = node;
|
|
node->children[i] = newnode;
|
|
}
|
|
|
|
SplitBrush( node->volume, node->planenum, &node->children[0]->volume, &node->children[1]->volume );
|
|
|
|
// recursively process children
|
|
for( i = 0; i < 2; i++ )
|
|
{
|
|
node->children[i] = BuildTree_r( node->children[i], children[i] );
|
|
}
|
|
|
|
return node;
|
|
}
|
|
|
|
//===========================================================
|
|
|
|
/*
|
|
=================
|
|
BrushBSP
|
|
|
|
The incoming list will be freed before exiting
|
|
=================
|
|
*/
|
|
tree_t *BrushBSP (bspbrush_t *brushlist, vec3_t mins, vec3_t maxs)
|
|
{
|
|
bspbrush_t *b;
|
|
node_t *node;
|
|
tree_t *tree;
|
|
float volume;
|
|
int i, c_faces, c_nonvisfaces, c_brushes;
|
|
|
|
tree = AllocTree();
|
|
|
|
c_faces = c_nonvisfaces = c_brushes = 0;
|
|
|
|
for( b = brushlist; b; b = b->next )
|
|
{
|
|
c_brushes++;
|
|
|
|
volume = BrushVolume( b );
|
|
if( volume < microvolume )
|
|
{
|
|
MsgDev( D_WARN, "entity %i, brush %i: microbrush\n", b->original->entitynum, b->original->brushnum );
|
|
}
|
|
|
|
for( i = 0; i < b->numsides; i++ )
|
|
{
|
|
if( b->sides[i].bevel )
|
|
continue;
|
|
if( !b->sides[i].winding )
|
|
continue;
|
|
if( b->sides[i].texinfo == TEXINFO_NODE )
|
|
continue;
|
|
if( b->sides[i].visible )
|
|
c_faces++;
|
|
else c_nonvisfaces++;
|
|
}
|
|
AddPointToBounds( b->mins, tree->mins, tree->maxs );
|
|
AddPointToBounds( b->maxs, tree->mins, tree->maxs );
|
|
}
|
|
|
|
c_nodes = 0;
|
|
c_nonvis = 0;
|
|
node = AllocNode();
|
|
node->volume = BrushFromBounds( mins, maxs );
|
|
|
|
tree->headnode = node;
|
|
|
|
node = BuildTree_r( node, brushlist );
|
|
return tree;
|
|
} |