mirror of
https://github.com/alliedmodders/hl2sdk.git
synced 2024-12-22 17:47:38 +08:00
1470 lines
29 KiB
C++
1470 lines
29 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#include "vbsp.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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// if a brush just barely pokes onto the other side,
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// let it slide by without chopping
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#define PLANESIDE_EPSILON 0.001
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//0.1
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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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/*
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================
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DrawBrushList
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================
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*/
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void DrawBrushList (bspbrush_t *brush, node_t *node)
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{
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int i;
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side_t *s;
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GLS_BeginScene ();
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for ( ; brush ; brush=brush->next)
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{
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for (i=0 ; i<brush->numsides ; i++)
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{
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s = &brush->sides[i];
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if (!s->winding)
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continue;
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if (s->texinfo == TEXINFO_NODE)
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GLS_Winding (s->winding, 1);
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else if (!s->visible)
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GLS_Winding (s->winding, 2);
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else
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GLS_Winding (s->winding, 0);
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}
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}
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GLS_EndScene ();
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}
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/*
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================
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WriteBrushList
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================
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*/
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void WriteBrushList (char *name, bspbrush_t *brush, qboolean onlyvis)
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{
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int i;
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side_t *s;
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qprintf ("writing %s\n", name);
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FileHandle_t f = g_pFileSystem->Open(name, "w");
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for ( ; brush ; brush=brush->next)
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{
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for (i=0 ; i<brush->numsides ; i++)
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{
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s = &brush->sides[i];
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if (!s->winding)
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continue;
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if (onlyvis && !s->visible)
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continue;
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OutputWinding (brush->sides[i].winding, f);
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}
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}
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g_pFileSystem->Close (f);
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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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Vector PointInsideBrush( bspbrush_t *brush )
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{
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Vector insidePoint = vec3_origin;
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bool bInside = false;
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for ( int k = 0; k < 4 && !bInside; k++ )
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{
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bInside = true;
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for (int i = 0; i < brush->numsides; i++)
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{
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side_t *side = &brush->sides[i];
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plane_t *plane = &g_MainMap->mapplanes[side->planenum];
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float d = DotProduct( plane->normal, insidePoint ) - plane->dist;
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if ( d < 0 )
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{
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bInside = false;
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insidePoint -= d * plane->normal;
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}
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}
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}
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return insidePoint;
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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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// translate the CSG problem to improve precision
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Vector insidePoint = PointInsideBrush( brush );
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Vector offset = -insidePoint;
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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 = &g_MainMap->mapplanes[side->planenum];
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w = BaseWindingForPlane (plane->normal, plane->dist + DotProduct(plane->normal, offset));
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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 = &g_MainMap->mapplanes[brush->sides[j].planenum^1];
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ChopWindingInPlace (&w, plane->normal, plane->dist + DotProduct(plane->normal, offset), 0); //CLIP_EPSILON);
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}
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TranslateWinding( w, -offset );
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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 (Vector& mins, Vector& maxs)
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{
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bspbrush_t *b;
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int i;
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Vector normal;
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vec_t dist;
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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 = g_MainMap->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 = g_MainMap->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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Vector 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 = &g_MainMap->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 = (tree_t*)malloc(sizeof(*tree));
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memset (tree, 0, 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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static int s_NodeCount = 0;
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node_t *node;
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node = (node_t*)malloc(sizeof(*node));
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memset (node, 0, sizeof(*node));
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node->id = s_NodeCount;
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node->diskId = -1;
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s_NodeCount++;
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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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static int s_BrushId = 0;
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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 = (bspbrush_t*)malloc(c);
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memset (bb, 0, c);
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bb->id = s_BrushId++;
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if (numthreads == 1)
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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 (numthreads == 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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PointInLeaf
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==================
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*/
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node_t *PointInLeaf (node_t *node, Vector& point)
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{
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vec_t d;
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plane_t *plane;
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while (node->planenum != PLANENUM_LEAF)
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{
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plane = &g_MainMap->mapplanes[node->planenum];
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if (plane->type < 3)
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{
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d = point[plane->type] - plane->dist;
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}
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else
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{
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d = DotProduct (point, plane->normal) - plane->dist;
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}
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if (d >= 0)
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node = node->children[0];
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else
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node = node->children[1];
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}
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return node;
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}
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//========================================================
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/*
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==============
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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 BrushBspBoxOnPlaneSide (const Vector& mins, const Vector& maxs, dplane_t *plane)
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{
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int side;
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int i;
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Vector 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+PLANESIDE_EPSILON)
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side |= PSIDE_FRONT;
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if (mins[plane->type] < plane->dist-PLANESIDE_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 >= PLANESIDE_EPSILON)
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side = PSIDE_FRONT;
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if (dist2 < PLANESIDE_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)
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Error ("bad planenum");
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if (num == planenum)
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return PSIDE_BACK|PSIDE_FACING;
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if (num == (planenum ^ 1) )
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return PSIDE_FRONT|PSIDE_FACING;
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}
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// box on plane side
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plane = &g_MainMap->mapplanes[planenum];
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s = BrushBspBoxOnPlaneSide (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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============
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TestBrushToPlanenum
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============
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*/
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int TestBrushToPlanenum (bspbrush_t *brush, int planenum,
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int *numsplits, qboolean *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)
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Error ("bad planenum");
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if (num == planenum)
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return PSIDE_BACK|PSIDE_FACING;
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if (num == (planenum ^ 1) )
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return PSIDE_FRONT|PSIDE_FACING;
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}
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// box on plane side
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plane = &g_MainMap->mapplanes[planenum];
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s = BrushBspBoxOnPlaneSide (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) // PLANESIDE_EPSILON)
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front = 1;
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if (d < -0.1) // PLANESIDE_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)
|
|
*hintsplit = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( (d_front > 0.0 && d_front < 1.0)
|
|
|| (d_back < 0.0 && d_back > -1.0) )
|
|
(*epsilonbrush)++;
|
|
|
|
#if 0
|
|
if (*numsplits == 0)
|
|
{ // didn't really need to be split
|
|
if (front)
|
|
s = PSIDE_FRONT;
|
|
else if (back)
|
|
s = PSIDE_BACK;
|
|
else
|
|
s = 0;
|
|
}
|
|
#endif
|
|
|
|
return s;
|
|
}
|
|
|
|
//========================================================
|
|
|
|
/*
|
|
================
|
|
WindingIsTiny
|
|
|
|
Returns true if the winding would be crunched out of
|
|
existance by the vertex snapping.
|
|
================
|
|
*/
|
|
#define EDGE_LENGTH 0.2
|
|
qboolean WindingIsTiny (winding_t *w)
|
|
{
|
|
int i, j;
|
|
vec_t len;
|
|
Vector delta;
|
|
int edges;
|
|
|
|
edges = 0;
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
j = i == w->numpoints - 1 ? 0 : i+1;
|
|
VectorSubtract (w->p[j], w->p[i], delta);
|
|
len = VectorLength (delta);
|
|
if (len > EDGE_LENGTH)
|
|
{
|
|
if (++edges == 3)
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// UNDONE: JAY: This should be a slightly better heuristic - it builds an OBB
|
|
// around the winding and tests planar dimensions. NOTE: This can fail when a
|
|
// winding normal cannot be constructed (or is degenerate), but that is probably
|
|
// desired in this case.
|
|
// UNDONE: Test & use this instead.
|
|
#if 0
|
|
qboolean WindingIsTiny2 (winding_t *w)
|
|
{
|
|
int i, j;
|
|
vec_t len;
|
|
Vector delta;
|
|
int edges;
|
|
|
|
vec_t maxLen = 0;
|
|
Vector maxEdge = vec3_origin;
|
|
|
|
edges = 0;
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
j = i == w->numpoints - 1 ? 0 : i+1;
|
|
VectorSubtract (w->p[j], w->p[i], delta);
|
|
len = VectorLength (delta);
|
|
if (len > maxLen)
|
|
{
|
|
maxEdge = delta;
|
|
maxLen = len;
|
|
}
|
|
}
|
|
Vector normal;
|
|
vec_t dist;
|
|
WindingPlane (w, normal, &dist); // normal can come back vec3_origin in some cases
|
|
VectorNormalize(maxEdge);
|
|
Vector cross = CrossProduct(normal, maxEdge);
|
|
VectorNormalize(cross);
|
|
Vector mins, maxs;
|
|
ClearBounds( mins, maxs );
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
Vector point;
|
|
point.x = DotProduct( w->p[i], maxEdge );
|
|
point.y = DotProduct( w->p[i], cross );
|
|
point.z = DotProduct( w->p[i], normal );
|
|
AddPointToBounds( point, mins, maxs );
|
|
}
|
|
|
|
// check to see if the size in the plane is too small in either dimension
|
|
Vector size = maxs - mins;
|
|
for ( i = 0; i < 2; i++ )
|
|
{
|
|
if ( size[i] < EDGE_LENGTH )
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
================
|
|
WindingIsHuge
|
|
|
|
Returns true if the winding still has one of the points
|
|
from basewinding for plane
|
|
================
|
|
*/
|
|
qboolean WindingIsHuge (winding_t *w)
|
|
{
|
|
int i, j;
|
|
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
for (j=0 ; j<3 ; j++)
|
|
if (w->p[i][j] < MIN_COORD_INTEGER || w->p[i][j] > MAX_COORD_INTEGER)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
//============================================================
|
|
|
|
/*
|
|
================
|
|
Leafnode
|
|
================
|
|
*/
|
|
void LeafNode (node_t *node, bspbrush_t *brushes)
|
|
{
|
|
bspbrush_t *b;
|
|
int i;
|
|
|
|
node->planenum = PLANENUM_LEAF;
|
|
node->contents = 0;
|
|
|
|
for (b=brushes ; b ; b=b->next)
|
|
{
|
|
// if the brush is solid and all of its sides are on nodes,
|
|
// it eats everything
|
|
if (b->original->contents & CONTENTS_SOLID)
|
|
{
|
|
for (i=0 ; i<b->numsides ; i++)
|
|
if (b->sides[i].texinfo != TEXINFO_NODE)
|
|
break;
|
|
if (i == b->numsides)
|
|
{
|
|
node->contents = CONTENTS_SOLID;
|
|
break;
|
|
}
|
|
}
|
|
node->contents |= b->original->contents;
|
|
}
|
|
|
|
node->brushlist = brushes;
|
|
}
|
|
|
|
|
|
void RemoveAreaPortalBrushes_R( node_t *node )
|
|
{
|
|
if( node->planenum == PLANENUM_LEAF )
|
|
{
|
|
// Remove any CONTENTS_AREAPORTAL brushes we added. We don't want them in the engine
|
|
// at runtime but we do want their flags in the leaves.
|
|
bspbrush_t **pPrev = &node->brushlist;
|
|
for( bspbrush_t *b=node->brushlist; b; b=b->next )
|
|
{
|
|
if( b->original->contents == CONTENTS_AREAPORTAL )
|
|
{
|
|
*pPrev = b->next;
|
|
}
|
|
else
|
|
{
|
|
pPrev = &b->next;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
RemoveAreaPortalBrushes_R( node->children[0] );
|
|
RemoveAreaPortalBrushes_R( node->children[1] );
|
|
}
|
|
}
|
|
|
|
|
|
//============================================================
|
|
|
|
void CheckPlaneAgainstParents (int pnum, node_t *node)
|
|
{
|
|
node_t *p;
|
|
|
|
for (p=node->parent ; p ; p=p->parent)
|
|
{
|
|
if (p->planenum == pnum)
|
|
Error ("Tried parent");
|
|
}
|
|
}
|
|
|
|
qboolean CheckPlaneAgainstVolume (int pnum, node_t *node)
|
|
{
|
|
bspbrush_t *front, *back;
|
|
qboolean good;
|
|
|
|
SplitBrush (node->volume, pnum, &front, &back);
|
|
|
|
good = (front && back);
|
|
|
|
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;
|
|
qboolean hintsplit = false;
|
|
|
|
bestside = NULL;
|
|
bestvalue = -99999;
|
|
bestsplits = 0;
|
|
|
|
// the search order goes: visible-structural, nonvisible-structural
|
|
// If any valid plane is available in a pass, no further
|
|
// passes will be tried.
|
|
numpasses = 2;
|
|
for (pass = 0 ; pass < numpasses ; pass++)
|
|
{
|
|
for (brush = brushes ; brush ; brush=brush->next)
|
|
{
|
|
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<1) )
|
|
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) )
|
|
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 (g_MainMap->mapplanes[pnum].type < 3)
|
|
value+=5; // axial is better
|
|
value -= epsilonbrush*1000; // avoid!
|
|
|
|
// trans should split last
|
|
if ( side->surf & SURF_TRANS )
|
|
{
|
|
value -= 500;
|
|
}
|
|
|
|
// never split a hint side except with another hint
|
|
if (hintsplit && !(side->surf & SURF_HINT) )
|
|
value = -9999999;
|
|
|
|
// water should split first
|
|
if (side->contents & (CONTENTS_WATER | CONTENTS_SLIME))
|
|
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 > 0)
|
|
{
|
|
if (numthreads == 1)
|
|
c_nonvis++;
|
|
}
|
|
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 = &g_MainMap->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) // PLANESIDE_EPSILON)
|
|
{ // only on back
|
|
*back = CopyBrush (brush);
|
|
return;
|
|
}
|
|
if (d_back > -0.1) // PLANESIDE_EPSILON)
|
|
{ // only on front
|
|
*front = CopyBrush (brush);
|
|
return;
|
|
}
|
|
|
|
|
|
// Move the CSG problem so that offset is at the origin
|
|
// This gives us much better floating point precision in the clipping operations
|
|
Vector offset = -0.5f * (brush->mins + brush->maxs);
|
|
// create a new winding from the split plane
|
|
|
|
w = BaseWindingForPlane (plane->normal, plane->dist + DotProduct(plane->normal,offset));
|
|
for (i=0 ; i<brush->numsides && w ; i++)
|
|
{
|
|
plane2 = &g_MainMap->mapplanes[brush->sides[i].planenum ^ 1];
|
|
ChopWindingInPlace (&w, plane2->normal, plane2->dist+DotProduct(plane2->normal,offset), 0); // PLANESIDE_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))
|
|
{
|
|
qprintf ("WARNING: huge winding\n");
|
|
}
|
|
|
|
TranslateWinding( w, -offset );
|
|
midwinding = w;
|
|
|
|
//
|
|
//
|
|
// split it for real
|
|
//
|
|
//
|
|
|
|
//
|
|
// allocate two new brushes referencing the original
|
|
//
|
|
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++ )
|
|
{
|
|
// get the current side
|
|
s = &brush->sides[i];
|
|
|
|
// get the sides winding
|
|
w = s->winding;
|
|
if( !w )
|
|
continue;
|
|
|
|
// clip the winding
|
|
ClipWindingEpsilon_Offset( w, plane->normal, plane->dist, 0 /*PLANESIDE_EPSILON*/, &cw[0], &cw[1], offset );
|
|
|
|
for( j = 0; j < 2; j++ )
|
|
{
|
|
// does winding exist?
|
|
if( !cw[j] )
|
|
continue;
|
|
#if 0
|
|
if (WindingIsTiny (cw[j]))
|
|
{
|
|
FreeWinding (cw[j]);
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
//
|
|
// create a clipped "side" with the new winding
|
|
//
|
|
cs = &b[j]->sides[b[j]->numsides];
|
|
b[j]->numsides++;
|
|
*cs = *s;
|
|
cs->winding = cw[j];
|
|
cs->tested = false;
|
|
// save the original side information
|
|
//cs->original = s->original;
|
|
}
|
|
}
|
|
|
|
|
|
// 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] < MIN_COORD_INTEGER || b[i]->maxs[j] > MAX_COORD_INTEGER)
|
|
{
|
|
qprintf ("bogus brush after clip\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (b[i]->numsides < 3 || j < 3)
|
|
{
|
|
FreeBrush (b[i]);
|
|
b[i] = NULL;
|
|
}
|
|
}
|
|
|
|
if ( !(b[0] && b[1]) )
|
|
{
|
|
if (!b[0] && !b[1])
|
|
qprintf ("split removed brush\n");
|
|
else
|
|
qprintf ("split not on both sides\n");
|
|
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;
|
|
|
|
// initialize the displacement map index
|
|
cs->pMapDisp = NULL;
|
|
|
|
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;
|
|
// qprintf ("tiny volume after clip\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
*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;
|
|
side_t *side;
|
|
int sides;
|
|
int i;
|
|
|
|
*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;
|
|
int i;
|
|
bspbrush_t *children[2];
|
|
|
|
if (numthreads == 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 = -1;
|
|
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, Vector& mins, Vector& maxs)
|
|
{
|
|
node_t *node;
|
|
bspbrush_t *b;
|
|
int c_faces, c_nonvisfaces;
|
|
int c_brushes;
|
|
tree_t *tree;
|
|
int i;
|
|
vec_t volume;
|
|
|
|
qprintf ("--- BrushBSP ---\n");
|
|
|
|
tree = AllocTree ();
|
|
|
|
c_faces = 0;
|
|
c_nonvisfaces = 0;
|
|
c_brushes = 0;
|
|
for (b=brushlist ; b ; b=b->next)
|
|
{
|
|
c_brushes++;
|
|
|
|
volume = BrushVolume (b);
|
|
if (volume < microvolume)
|
|
{
|
|
Warning("Brush %i: WARNING, microbrush\n", b->original->id);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
qprintf ("%5i brushes\n", c_brushes);
|
|
qprintf ("%5i visible faces\n", c_faces);
|
|
qprintf ("%5i nonvisible faces\n", c_nonvisfaces);
|
|
|
|
c_nodes = 0;
|
|
c_nonvis = 0;
|
|
node = AllocNode ();
|
|
|
|
node->volume = BrushFromBounds (mins, maxs);
|
|
|
|
tree->headnode = node;
|
|
|
|
node = BuildTree_r (node, brushlist);
|
|
qprintf ("%5i visible nodes\n", c_nodes/2 - c_nonvis);
|
|
qprintf ("%5i nonvis nodes\n", c_nonvis);
|
|
qprintf ("%5i leafs\n", (c_nodes+1)/2);
|
|
#if 0
|
|
{ // debug code
|
|
static node_t *tnode;
|
|
Vector p;
|
|
|
|
p[0] = -1469;
|
|
p[1] = -118;
|
|
p[2] = 119;
|
|
tnode = PointInLeaf (tree->headnode, p);
|
|
Msg("contents: %i\n", tnode->contents);
|
|
p[0] = 0;
|
|
}
|
|
#endif
|
|
return tree;
|
|
}
|
|
|