mirror of
https://github.com/ZDoom/raze-gles.git
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f7dd0ec4a2
As it turned out, the triangulator only works fine for regular polygons, but creates incomplete meshes for sectors with multiple sections or some degenerate areas, which are quite common with swinging doors. The node builder is more costly and creates wall splits, of course, but it does not create broken output for degenerate sectors so it's a good fallback.
440 lines
12 KiB
C++
440 lines
12 KiB
C++
/*
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** nodebuild_extract.cpp
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**
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** Converts the nodes, segs, and subsectors from the node builder's
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** internal format to the format used by the rest of the game.
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**
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**---------------------------------------------------------------------------
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** Copyright 2002-2006 Randy Heit
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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** 4. When not used as part of ZDoom or a ZDoom derivative, this code will be
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** covered by the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or (at
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** your option) any later version.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include <string.h>
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#include <float.h>
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#include "nodebuild.h"
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#if 0
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#define D(x) x
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#define DD 1
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#else
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#define D(x) do{}while(0)
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#undef DD
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#endif
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void FNodeBuilder::Extract (FLevelLocals &theLevel)
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{
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int i;
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auto &outVerts = theLevel.vertexes;
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int vertCount = Vertices.Size ();
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outVerts.Alloc(vertCount);
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for (i = 0; i < vertCount; ++i)
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{
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outVerts[i].set(Vertices[i].x, Vertices[i].y);
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}
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auto &outSubs = theLevel.subsectors;
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auto subCount = Subsectors.Size();
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outSubs.Alloc(subCount);
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memset(&outSubs[0], 0, subCount * sizeof(subsector_t));
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auto &outNodes = theLevel.nodes;
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auto nodeCount = Nodes.Size ();
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outNodes.Alloc(nodeCount);
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memcpy (&outNodes[0], &Nodes[0], nodeCount*sizeof(node_t));
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for (unsigned i = 0; i < nodeCount; ++i)
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{
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D(Printf(PRINT_LOG, "Node %d: Splitter[%08x,%08x] [%08x,%08x]\n", i,
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outNodes[i].x, outNodes[i].y, outNodes[i].dx, outNodes[i].dy));
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// Go backwards because on 64-bit systems, both of the intchildren are
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// inside the first in-game child.
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for (int j = 1; j >= 0; --j)
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{
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if (outNodes[i].intchildren[j] & 0x80000000)
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{
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D(Printf(PRINT_LOG, " subsector %d\n", outNodes[i].intchildren[j] & 0x7FFFFFFF));
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outNodes[i].children[j] = (uint8_t *)(&outSubs[(outNodes[i].intchildren[j] & 0x7fffffff)]) + 1;
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}
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else
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{
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D(Printf(PRINT_LOG, " node %d\n", outNodes[i].intchildren[j]));
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outNodes[i].children[j] = &outNodes[outNodes[i].intchildren[j]];
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}
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}
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for (int j = 0; j < 2; ++j)
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{
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for (int k = 0; k < 4; ++k)
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{
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outNodes[i].bbox[j][k] = FIXED2FLOAT(outNodes[i].nb_bbox[j][k]);
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}
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}
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}
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auto &outSegs = theLevel.segs;
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if (GLNodes)
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{
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TArray<glseg_t> segs (Segs.Size()*5/4);
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for (unsigned i = 0; i < subCount; ++i)
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{
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uint32_t numsegs = CloseSubsector (segs, i, &outVerts[0]);
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outSubs[i].numlines = numsegs;
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outSubs[i].firstline = (seg_t *)(size_t)(segs.Size() - numsegs);
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}
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auto segCount = segs.Size ();
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outSegs.Alloc(segCount);
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for (unsigned i = 0; i < segCount; ++i)
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{
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outSegs[i] = *(seg_t *)&segs[i];
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if (segs[i].Partner != UINT_MAX)
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{
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const uint32_t storedseg = Segs[segs[i].Partner].storedseg;
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outSegs[i].PartnerSeg = UINT_MAX == storedseg ? nullptr : &outSegs[storedseg];
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}
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else
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{
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outSegs[i].PartnerSeg = nullptr;
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}
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}
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}
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else
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{
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memcpy (&outSubs[0], &Subsectors[0], subCount*sizeof(subsector_t));
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auto segCount = Segs.Size ();
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outSegs.Alloc(segCount);
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for (unsigned i = 0; i < segCount; ++i)
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{
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const FPrivSeg *org = &Segs[SegList[i].SegNum];
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seg_t *out = &outSegs[i];
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D(Printf(PRINT_LOG, "Seg %d: v1(%d) -> v2(%d)\n", i, org->v1, org->v2));
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out->v1 = &outVerts[org->v1];
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out->v2 = &outVerts[org->v2];
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out->backsector = org->backsector;
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out->frontsector = org->frontsector;
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out->linedef = Level.Lines + org->linedef;
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out->sidedef = Level.Sides + org->sidedef;
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out->PartnerSeg = nullptr;
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}
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}
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for (unsigned i = 0; i < subCount; ++i)
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{
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outSubs[i].firstline = &outSegs[(size_t)outSubs[i].firstline];
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}
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D(Printf("%i segs, %i nodes, %i subsectors\n", segCount, nodeCount, subCount));
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for (i = 0; i < Level.NumLines; ++i)
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{
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Level.Lines[i].v1 = &outVerts[(size_t)Level.Lines[i].v1];
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Level.Lines[i].v2 = &outVerts[(size_t)Level.Lines[i].v2];
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}
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}
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int FNodeBuilder::CloseSubsector (TArray<glseg_t> &segs, int subsector, vertex_t *outVerts)
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{
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FPrivSeg *seg, *prev;
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angle_t prevAngle;
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double accumx, accumy;
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fixed_t midx, midy;
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int firstVert;
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uint32_t first, max, count, i, j;
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bool diffplanes;
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int firstplane;
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first = (uint32_t)(size_t)Subsectors[subsector].firstline;
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max = first + Subsectors[subsector].numlines;
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count = 0;
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accumx = accumy = 0.0;
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diffplanes = false;
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firstplane = Segs[SegList[first].SegNum].planenum;
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// Calculate the midpoint of the subsector and also check for degenerate subsectors.
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// A subsector is degenerate if it exists in only one dimension, which can be
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// detected when all the segs lie in the same plane. This can happen if you have
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// outward-facing lines in the void that don't point toward any sector. (Some of the
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// polyobjects in Hexen are constructed like this.)
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for (i = first; i < max; ++i)
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{
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seg = &Segs[SegList[i].SegNum];
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accumx += double(Vertices[seg->v1].x) + double(Vertices[seg->v2].x);
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accumy += double(Vertices[seg->v1].y) + double(Vertices[seg->v2].y);
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if (firstplane != seg->planenum)
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{
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diffplanes = true;
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}
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}
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midx = fixed_t(accumx / (max - first) / 2);
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midy = fixed_t(accumy / (max - first) / 2);
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seg = &Segs[SegList[first].SegNum];
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prevAngle = PointToAngle (Vertices[seg->v1].x - midx, Vertices[seg->v1].y - midy);
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seg->storedseg = PushGLSeg (segs, seg, outVerts);
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count = 1;
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prev = seg;
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firstVert = seg->v1;
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#ifdef DD
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Printf(PRINT_LOG, "--%d--\n", subsector);
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for (j = first; j < max; ++j)
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{
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seg = &Segs[SegList[j].SegNum];
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angle_t ang = PointToAngle (Vertices[seg->v1].x - midx, Vertices[seg->v1].y - midy);
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Printf(PRINT_LOG, "%d%c %5d(%5d,%5d)->%5d(%5d,%5d) - %3.5f %d,%d [%08x,%08x]-[%08x,%08x]\n", j,
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seg->linedef == -1 ? '+' : ':',
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seg->v1, Vertices[seg->v1].x>>16, Vertices[seg->v1].y>>16,
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seg->v2, Vertices[seg->v2].x>>16, Vertices[seg->v2].y>>16,
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double(ang/2)*180/(1<<30),
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seg->planenum, seg->planefront,
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Vertices[seg->v1].x, Vertices[seg->v1].y,
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Vertices[seg->v2].x, Vertices[seg->v2].y);
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}
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#endif
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if (diffplanes)
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{ // A well-behaved subsector. Output the segs sorted by the angle formed by connecting
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// the subsector's center to their first vertex.
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D(Printf(PRINT_LOG, "Well behaved subsector\n"));
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for (i = first + 1; i < max; ++i)
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{
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angle_t bestdiff = ANGLE_MAX;
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FPrivSeg *bestseg = NULL;
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uint32_t bestj = UINT_MAX;
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j = first;
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do
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{
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seg = &Segs[SegList[j].SegNum];
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angle_t ang = PointToAngle (Vertices[seg->v1].x - midx, Vertices[seg->v1].y - midy);
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angle_t diff = prevAngle - ang;
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if (seg->v1 == prev->v2)
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{
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bestdiff = diff;
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bestseg = seg;
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bestj = j;
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break;
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}
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if (diff < bestdiff && diff > 0)
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{
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bestdiff = diff;
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bestseg = seg;
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bestj = j;
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}
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}
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while (++j < max);
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// Is a NULL bestseg actually okay?
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if (bestseg != NULL)
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{
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seg = bestseg;
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}
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if (prev->v2 != seg->v1)
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{
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// Add a new miniseg to connect the two segs
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PushConnectingGLSeg (subsector, segs, &outVerts[prev->v2], &outVerts[seg->v1]);
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count++;
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}
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#ifdef DD
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Printf(PRINT_LOG, "+%d\n", bestj);
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#endif
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prevAngle -= bestdiff;
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seg->storedseg = PushGLSeg (segs, seg, outVerts);
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count++;
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prev = seg;
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if (seg->v2 == firstVert)
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{
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prev = seg;
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break;
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}
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}
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#ifdef DD
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Printf(PRINT_LOG, "\n");
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#endif
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}
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else
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{ // A degenerate subsector. These are handled in three stages:
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// Stage 1. Proceed in the same direction as the start seg until we
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// hit the seg furthest from it.
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// Stage 2. Reverse direction and proceed until we hit the seg
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// furthest from the start seg.
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// Stage 3. Reverse direction again and insert segs until we get
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// to the start seg.
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// A dot product serves to determine distance from the start seg.
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D(Printf(PRINT_LOG, "degenerate subsector\n"));
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// Stage 1. Go forward.
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count += OutputDegenerateSubsector (segs, subsector, true, 0, prev, outVerts);
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// Stage 2. Go backward.
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count += OutputDegenerateSubsector (segs, subsector, false, DBL_MAX, prev, outVerts);
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// Stage 3. Go forward again.
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count += OutputDegenerateSubsector (segs, subsector, true, -DBL_MAX, prev, outVerts);
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}
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if (prev->v2 != firstVert)
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{
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PushConnectingGLSeg (subsector, segs, &outVerts[prev->v2], &outVerts[firstVert]);
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count++;
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}
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#ifdef DD
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Printf(PRINT_LOG, "Output GL subsector %d:\n", subsector);
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for (i = segs.Size() - count; i < (int)segs.Size(); ++i)
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{
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Printf(PRINT_LOG, " Seg %5d%c(%5d,%5d)-(%5d,%5d) [%08x,%08x]-[%08x,%08x]\n", i,
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segs[i].linedef == NULL ? '+' : ' ',
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segs[i].v1->fixX()>>16,
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segs[i].v1->fixY()>>16,
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segs[i].v2->fixX()>>16,
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segs[i].v2->fixY()>>16,
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segs[i].v1->fixX(),
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segs[i].v1->fixY(),
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segs[i].v2->fixX(),
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segs[i].v2->fixY());
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}
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#endif
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return count;
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}
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int FNodeBuilder::OutputDegenerateSubsector (TArray<glseg_t> &segs, int subsector, bool bForward, double lastdot, FPrivSeg *&prev, vertex_t *outVerts)
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{
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static const double bestinit[2] = { -DBL_MAX, DBL_MAX };
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FPrivSeg *seg;
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int i, j, first, max, count;
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double dot, x1, y1, dx, dy, dx2, dy2;
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bool wantside;
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first = (uint32_t)(size_t)Subsectors[subsector].firstline;
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max = first + Subsectors[subsector].numlines;
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count = 0;
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seg = &Segs[SegList[first].SegNum];
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x1 = Vertices[seg->v1].x;
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y1 = Vertices[seg->v1].y;
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dx = Vertices[seg->v2].x - x1;
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dy = Vertices[seg->v2].y - y1;
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wantside = seg->planefront ^ !bForward;
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for (i = first + 1; i < max; ++i)
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{
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double bestdot = bestinit[bForward];
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FPrivSeg *bestseg = NULL;
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for (j = first + 1; j < max; ++j)
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{
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seg = &Segs[SegList[j].SegNum];
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if (seg->planefront != wantside)
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{
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continue;
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}
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dx2 = Vertices[seg->v1].x - x1;
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dy2 = Vertices[seg->v1].y - y1;
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dot = dx*dx2 + dy*dy2;
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if (bForward)
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{
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if (dot < bestdot && dot > lastdot)
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{
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bestdot = dot;
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bestseg = seg;
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}
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}
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else
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{
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if (dot > bestdot && dot < lastdot)
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{
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bestdot = dot;
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bestseg = seg;
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}
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}
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}
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if (bestseg != NULL)
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{
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if (prev->v2 != bestseg->v1)
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{
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PushConnectingGLSeg (subsector, segs, &outVerts[prev->v2], &outVerts[bestseg->v1]);
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count++;
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}
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seg->storedseg = PushGLSeg (segs, bestseg, outVerts);
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count++;
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prev = bestseg;
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lastdot = bestdot;
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}
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}
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return count;
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}
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uint32_t FNodeBuilder::PushGLSeg (TArray<glseg_t> &segs, const FPrivSeg *seg, vertex_t *outVerts)
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{
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glseg_t newseg;
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newseg.v1 = outVerts + seg->v1;
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newseg.v2 = outVerts + seg->v2;
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newseg.backsector = seg->backsector;
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newseg.frontsector = seg->frontsector;
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if (seg->linedef != -1)
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{
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newseg.linedef = Level.Lines + seg->linedef;
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newseg.sidedef = Level.Sides + seg->sidedef;
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}
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else
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{
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newseg.linedef = NULL;
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newseg.sidedef = NULL;
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}
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newseg.Partner = seg->partner;
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return (uint32_t)segs.Push (newseg);
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}
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void FNodeBuilder::PushConnectingGLSeg (int subsector, TArray<glseg_t> &segs, vertex_t *v1, vertex_t *v2)
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{
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glseg_t newseg;
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newseg.v1 = v1;
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newseg.v2 = v2;
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newseg.backsector = NULL;
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newseg.frontsector = NULL;
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newseg.linedef = NULL;
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newseg.sidedef = NULL;
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newseg.Partner = UINT_MAX;
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segs.Push (newseg);
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}
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