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https://github.com/ZDoom/gzdoom.git
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531 lines
15 KiB
C++
531 lines
15 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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#include "g_levellocals.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 &level)
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{
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int i;
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auto &outVerts = level.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 = level.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 = level.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 = level.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 != DWORD_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 = DWORD_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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void FNodeBuilder::ExtractMini (FMiniBSP *bsp)
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{
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unsigned int i;
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bsp->bDirty = false;
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bsp->Verts.Resize(Vertices.Size());
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for (i = 0; i < Vertices.Size(); ++i)
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{
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bsp->Verts[i].set(Vertices[i].x, Vertices[i].y);
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}
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bsp->Subsectors.Resize(Subsectors.Size());
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memset(&bsp->Subsectors[0], 0, Subsectors.Size() * sizeof(subsector_t));
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bsp->Nodes.Resize(Nodes.Size());
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memcpy(&bsp->Nodes[0], &Nodes[0], Nodes.Size()*sizeof(node_t));
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for (i = 0; i < Nodes.Size(); ++i)
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{
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D(Printf(PRINT_LOG, "Node %d:\n", i));
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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 (bsp->Nodes[i].intchildren[j] & 0x80000000)
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{
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D(Printf(PRINT_LOG, " subsector %d\n", bsp->Nodes[i].intchildren[j] & 0x7FFFFFFF));
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bsp->Nodes[i].children[j] = (uint8_t *)&bsp->Subsectors[bsp->Nodes[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", bsp->Nodes[i].intchildren[j]));
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bsp->Nodes[i].children[j] = &bsp->Nodes[bsp->Nodes[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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bsp->Nodes[i].bbox[j][k] = FIXED2FLOAT(bsp->Nodes[i].nb_bbox[j][k]);
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}
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}
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}
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if (GLNodes)
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{
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TArray<glseg_t> glsegs;
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for (i = 0; i < Subsectors.Size(); ++i)
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{
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uint32_t numsegs = CloseSubsector (glsegs, i, &bsp->Verts[0]);
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bsp->Subsectors[i].numlines = numsegs;
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bsp->Subsectors[i].firstline = &bsp->Segs[bsp->Segs.Size() - numsegs];
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}
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bsp->Segs.Resize(glsegs.Size());
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for (i = 0; i < glsegs.Size(); ++i)
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{
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bsp->Segs[i] = *(seg_t *)&glsegs[i];
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}
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}
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else
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{
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memcpy(&bsp->Subsectors[0], &Subsectors[0], Subsectors.Size()*sizeof(subsector_t));
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bsp->Segs.Resize(Segs.Size());
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for (i = 0; i < Segs.Size(); ++i)
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{
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const FPrivSeg *org = &Segs[SegList[i].SegNum];
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seg_t *out = &bsp->Segs[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 = &bsp->Verts[org->v1];
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out->v2 = &bsp->Verts[org->v2];
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out->backsector = org->backsector;
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out->frontsector = org->frontsector;
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if (org->sidedef != int(NO_SIDE))
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{
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out->linedef = Level.Lines + org->linedef;
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out->sidedef = Level.Sides + org->sidedef;
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}
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else // part of a miniseg
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{
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out->linedef = NULL;
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out->sidedef = NULL;
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}
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}
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for (i = 0; i < bsp->Subsectors.Size(); ++i)
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{
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bsp->Subsectors[i].firstline = &bsp->Segs[(size_t)bsp->Subsectors[i].firstline];
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}
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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 = DWORD_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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}
|
|
dx2 = Vertices[seg->v1].x - x1;
|
|
dy2 = Vertices[seg->v1].y - y1;
|
|
dot = dx*dx2 + dy*dy2;
|
|
|
|
if (bForward)
|
|
{
|
|
if (dot < bestdot && dot > lastdot)
|
|
{
|
|
bestdot = dot;
|
|
bestseg = seg;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (dot > bestdot && dot < lastdot)
|
|
{
|
|
bestdot = dot;
|
|
bestseg = seg;
|
|
}
|
|
}
|
|
}
|
|
if (bestseg != NULL)
|
|
{
|
|
if (prev->v2 != bestseg->v1)
|
|
{
|
|
PushConnectingGLSeg (subsector, segs, &outVerts[prev->v2], &outVerts[bestseg->v1]);
|
|
count++;
|
|
}
|
|
seg->storedseg = PushGLSeg (segs, bestseg, outVerts);
|
|
count++;
|
|
prev = bestseg;
|
|
lastdot = bestdot;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
uint32_t FNodeBuilder::PushGLSeg (TArray<glseg_t> &segs, const FPrivSeg *seg, vertex_t *outVerts)
|
|
{
|
|
glseg_t newseg;
|
|
|
|
newseg.v1 = outVerts + seg->v1;
|
|
newseg.v2 = outVerts + seg->v2;
|
|
newseg.backsector = seg->backsector;
|
|
newseg.frontsector = seg->frontsector;
|
|
if (seg->linedef != -1)
|
|
{
|
|
newseg.linedef = Level.Lines + seg->linedef;
|
|
newseg.sidedef = Level.Sides + seg->sidedef;
|
|
}
|
|
else
|
|
{
|
|
newseg.linedef = NULL;
|
|
newseg.sidedef = NULL;
|
|
}
|
|
newseg.Partner = seg->partner;
|
|
return (uint32_t)segs.Push (newseg);
|
|
}
|
|
|
|
void FNodeBuilder::PushConnectingGLSeg (int subsector, TArray<glseg_t> &segs, vertex_t *v1, vertex_t *v2)
|
|
{
|
|
glseg_t newseg;
|
|
|
|
newseg.v1 = v1;
|
|
newseg.v2 = v2;
|
|
newseg.backsector = NULL;
|
|
newseg.frontsector = NULL;
|
|
newseg.linedef = NULL;
|
|
newseg.sidedef = NULL;
|
|
newseg.Partner = DWORD_MAX;
|
|
segs.Push (newseg);
|
|
}
|