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506 lines
14 KiB
C++
506 lines
14 KiB
C++
//
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//---------------------------------------------------------------------------
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//
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// Copyright(C) 2005-2016 Christoph Oelckers
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// All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see http://www.gnu.org/licenses/
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//
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//--------------------------------------------------------------------------
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//
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#include "doomtype.h"
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#include "p_local.h"
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#include "p_lnspec.h"
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#include "c_dispatch.h"
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#include "a_sharedglobal.h"
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#include "g_levellocals.h"
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#include "r_utility.h"
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//==========================================================================
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//
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// Helper types for portal grouping
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//
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//==========================================================================
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struct FPortalID
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{
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DVector2 mDisplacement;
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// for the hash code
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operator intptr_t() const { return (FLOAT2FIXED(mDisplacement.X) >> 8) + (FLOAT2FIXED(mDisplacement.Y) << 8); }
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bool operator != (const FPortalID &other) const
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{
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return mDisplacement != other.mDisplacement;
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}
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};
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struct FPortalSector
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{
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sector_t *mSub;
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int mPlane;
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};
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typedef TArray<FPortalSector> FPortalSectors;
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typedef TMap<FPortalID, FPortalSectors> FPortalMap;
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//==========================================================================
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//
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// this is left as fixed_t because the nodes also are, it makes no sense
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// to convert this without converting the nodes as well.
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//
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//==========================================================================
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struct FCoverageVertex
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{
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fixed_t x, y;
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bool operator !=(FCoverageVertex &other)
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{
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return x != other.x || y != other.y;
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}
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};
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struct FCoverageLine
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{
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FCoverageVertex v[2];
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};
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struct FCoverageBuilder
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{
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subsector_t *target;
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TArray<int> collect;
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FCoverageVertex center;
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//==========================================================================
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//
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//
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//
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//==========================================================================
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FCoverageBuilder(subsector_t *sub)
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{
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target = sub;
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}
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//==========================================================================
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//
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// GetIntersection
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//
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// adapted from P_InterceptVector
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//
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//==========================================================================
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bool GetIntersection(FCoverageVertex *v1, FCoverageVertex *v2, node_t *bsp, FCoverageVertex *v)
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{
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double frac;
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double num;
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double den;
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double v2x = (double)v1->x;
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double v2y = (double)v1->y;
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double v2dx = (double)(v2->x - v1->x);
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double v2dy = (double)(v2->y - v1->y);
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double v1x = (double)bsp->x;
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double v1y = (double)bsp->y;
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double v1dx = (double)bsp->dx;
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double v1dy = (double)bsp->dy;
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den = v1dy*v2dx - v1dx*v2dy;
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if (den == 0)
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return false; // parallel
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num = (v1x - v2x)*v1dy + (v2y - v1y)*v1dx;
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frac = num / den;
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if (frac < 0. || frac > 1.) return false;
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v->x = xs_RoundToInt(v2x + frac * v2dx);
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v->y = xs_RoundToInt(v2y + frac * v2dy);
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return true;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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double PartitionDistance(FCoverageVertex *vt, node_t *node)
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{
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return fabs(double(-node->dy) * (vt->x - node->x) + double(node->dx) * (vt->y - node->y)) / (node->len * 65536.);
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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int PointOnSide(FCoverageVertex *vt, node_t *node)
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{
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return R_PointOnSide(vt->x, vt->y, node);
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}
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//==========================================================================
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//
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// adapted from polyobject splitter
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//
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//==========================================================================
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void CollectNode(void *node, TArray<FCoverageVertex> &shape)
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{
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static TArray<FCoverageLine> lists[2];
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const double COVERAGE_EPSILON = 6.; // same epsilon as the node builder
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if (!((size_t)node & 1)) // Keep going until found a subsector
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{
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node_t *bsp = (node_t *)node;
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int centerside = R_PointOnSide(center.x, center.y, bsp);
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lists[0].Clear();
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lists[1].Clear();
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for(unsigned i=0;i<shape.Size(); i++)
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{
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FCoverageVertex *v1 = &shape[i];
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FCoverageVertex *v2 = &shape[(i+1) % shape.Size()];
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FCoverageLine vl = {{*v1, *v2}};
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double dist_v1 = PartitionDistance(v1, bsp);
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double dist_v2 = PartitionDistance(v2, bsp);
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if(dist_v1 <= COVERAGE_EPSILON)
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{
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if (dist_v2 <= COVERAGE_EPSILON)
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{
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lists[centerside].Push(vl);
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}
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else
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{
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int side = PointOnSide(v2, bsp);
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lists[side].Push(vl);
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}
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}
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else if (dist_v2 <= COVERAGE_EPSILON)
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{
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int side = PointOnSide(v1, bsp);
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lists[side].Push(vl);
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}
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else
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{
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int side1 = PointOnSide(v1, bsp);
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int side2 = PointOnSide(v2, bsp);
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if(side1 != side2)
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{
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// if the partition line crosses this seg, we must split it.
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FCoverageVertex vert;
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if (GetIntersection(v1, v2, bsp, &vert))
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{
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lists[0].Push(vl);
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lists[1].Push(vl);
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lists[side1].Last().v[1] = vert;
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lists[side2].Last().v[0] = vert;
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}
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else
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{
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// should never happen
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lists[side1].Push(vl);
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}
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}
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else
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{
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// both points on the same side.
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lists[side1].Push(vl);
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}
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}
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}
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if (lists[1].Size() == 0)
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{
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CollectNode(bsp->children[0], shape);
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}
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else if (lists[0].Size() == 0)
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{
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CollectNode(bsp->children[1], shape);
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}
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else
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{
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// copy the static arrays into local ones
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TArray<FCoverageVertex> locallists[2];
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for(int l=0;l<2;l++)
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{
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for (unsigned i=0;i<lists[l].Size(); i++)
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{
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locallists[l].Push(lists[l][i].v[0]);
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unsigned i1= (i+1)%lists[l].Size();
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if (lists[l][i1].v[0] != lists[l][i].v[1])
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{
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locallists[l].Push(lists[l][i].v[1]);
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}
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}
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}
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CollectNode(bsp->children[0], locallists[0]);
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CollectNode(bsp->children[1], locallists[1]);
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}
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}
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else
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{
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// we reached a subsector so we can link the node with this subsector
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subsector_t *sub = (subsector_t *)((uint8_t *)node - 1);
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collect.Push(int(sub->Index()));
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}
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}
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};
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//==========================================================================
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//
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// Calculate portal coverage for a single subsector
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// This data is used by the clipper to free up the ranges covered by a portal.
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//
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// This also gets called by the render hack code because ZDoom was really lax
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// with its stacked sector things and allowed partial tagging of affected sectors
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// Any such sector will only be found during rendering and must create its
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// coverage info then.
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//
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//==========================================================================
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void BuildPortalCoverage(FPortalCoverage *coverage, subsector_t *subsector, const DVector2 &displacement)
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{
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TArray<FCoverageVertex> shape;
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double centerx=0, centery=0;
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shape.Resize(subsector->numlines);
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for(unsigned i=0; i<subsector->numlines; i++)
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{
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centerx += (shape[i].x = FLOAT2FIXED(subsector->firstline[i].v1->fX() + displacement.X));
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centery += (shape[i].y = FLOAT2FIXED(subsector->firstline[i].v1->fY() + displacement.Y));
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}
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FCoverageBuilder build(subsector);
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build.center.x = xs_CRoundToInt(centerx / subsector->numlines);
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build.center.y = xs_CRoundToInt(centery / subsector->numlines);
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build.CollectNode(level.HeadNode(), shape);
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coverage->subsectors = new uint32_t[build.collect.Size()];
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coverage->sscount = build.collect.Size();
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memcpy(coverage->subsectors, &build.collect[0], build.collect.Size() * sizeof(uint32_t));
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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static void CollectPortalSectors(FPortalMap &collection)
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{
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for (auto &sec : level.sectors)
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{
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for (int j = 0; j < 2; j++)
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{
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int ptype = sec.GetPortalType(j);
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if (ptype== PORTS_STACKEDSECTORTHING || ptype == PORTS_PORTAL || ptype == PORTS_LINKEDPORTAL) // only offset-displacing portal types
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{
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FPortalID id = { sec.GetPortalDisplacement(j) };
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FPortalSectors &sss = collection[id];
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FPortalSector ss = { &sec, j };
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sss.Push(ss);
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}
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}
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}
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}
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//==========================================================================
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//
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// group sector portals by displacement
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// The renderer can handle such a group in one go to avoid multiple
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// BSP traversals
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//
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//==========================================================================
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static void GroupSectorPortals()
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{
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FPortalMap collection;
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CollectPortalSectors(collection);
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level.portalGroups.Clear();
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FPortalMap::Iterator it(collection);
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FPortalMap::Pair *pair;
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int c = 0;
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int planeflags = 0;
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while (it.NextPair(pair))
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{
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for (unsigned i = 0; i < pair->Value.Size(); i++)
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{
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if (pair->Value[i].mPlane == sector_t::floor) planeflags |= 1;
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else if (pair->Value[i].mPlane == sector_t::ceiling) planeflags |= 2;
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}
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for (int i = 1; i <= 2; i <<= 1)
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{
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// add separate portals for floor and ceiling.
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if (planeflags & i)
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{
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FSectorPortalGroup *portal = new FSectorPortalGroup;
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portal->mDisplacement = pair->Key.mDisplacement;
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portal->plane = (i == 1 ? sector_t::floor : sector_t::ceiling); /**/
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portal->glportal = NULL;
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level.portalGroups.Push(portal);
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for (unsigned j = 0; j < pair->Value.Size(); j++)
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{
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sector_t *sec = pair->Value[j].mSub;
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int plane = pair->Value[j].mPlane;
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if (portal->plane == plane)
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{
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for (int k = 0; k < sec->subsectorcount; k++)
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{
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subsector_t *sub = sec->subsectors[k];
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BuildPortalCoverage(&sub->portalcoverage[plane], sub, pair->Key.mDisplacement);
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}
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sec->portals[plane] = portal;
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}
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}
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}
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}
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}
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}
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//==========================================================================
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//
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// Group the line portals
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// Each group must be a continuous set of colinear linedefs with no gaps
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//
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//==========================================================================
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static void GroupLinePortals()
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{
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level.linePortalSpans.Clear();
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TArray<int> tempindex;
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tempindex.Reserve(level.linePortals.Size());
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memset(&tempindex[0], -1, level.linePortals.Size() * sizeof(int));
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for (unsigned i = 0; i < level.linePortals.Size(); i++)
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{
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auto port = level.linePortals[i];
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bool gotsome;
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if (tempindex[i] == -1)
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{
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tempindex[i] = level.linePortalSpans.Size();
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line_t *pSrcLine = level.linePortals[i].mOrigin;
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line_t *pLine = level.linePortals[i].mDestination;
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FLinePortalSpan &glport = level.linePortalSpans[level.linePortalSpans.Reserve(1)];
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glport.lines.Push(&level.linePortals[i]);
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// We cannot do this grouping for non-linked portals because they can be changed at run time.
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if (level.linePortals[i].mType == PORTT_LINKED && pLine != nullptr)
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{
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glport.v1 = pLine->v1;
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glport.v2 = pLine->v2;
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do
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{
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// now collect all other colinear lines connected to this one. We run this loop as long as it still finds a match
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gotsome = false;
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for (unsigned j = 0; j < level.linePortals.Size(); j++)
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{
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if (tempindex[j] == -1)
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{
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line_t *pSrcLine2 = level.linePortals[j].mOrigin;
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line_t *pLine2 = level.linePortals[j].mDestination;
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// angular precision is intentionally reduced to 32 bit BAM to account for precision problems (otherwise many not perfectly horizontal or vertical portals aren't found here.)
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unsigned srcang = pSrcLine->Delta().Angle().BAMs();
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unsigned dstang = pLine->Delta().Angle().BAMs();
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if ((pSrcLine->v2 == pSrcLine2->v1 && pLine->v1 == pLine2->v2) ||
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(pSrcLine->v1 == pSrcLine2->v2 && pLine->v2 == pLine2->v1))
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{
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// The line connects, now check the translation
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unsigned srcang2 = pSrcLine2->Delta().Angle().BAMs();
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unsigned dstang2 = pLine2->Delta().Angle().BAMs();
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if (srcang == srcang2 && dstang == dstang2)
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{
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// The lines connect and both source and destination are colinear, so this is a match
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gotsome = true;
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tempindex[j] = tempindex[i];
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if (pLine->v1 == pLine2->v2) glport.v1 = pLine2->v1;
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else glport.v2 = pLine2->v2;
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glport.lines.Push(&level.linePortals[j]);
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}
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}
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}
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}
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} while (gotsome);
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}
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}
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}
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// Final assignment can only be done when all allocations are finished. Otherwise the array may be moved.
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for (unsigned i = 0; i < level.linePortals.Size(); i++)
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{
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level.linePortals[i].mGroup = &level.linePortalSpans[tempindex[i]];
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}
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}
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void InitPortalGroups()
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{
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if (level.nodes.Size() == 0) return;
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GroupSectorPortals();
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GroupLinePortals();
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}
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CCMD(dumpportals)
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{
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for(unsigned i=0;i<level.portalGroups.Size(); i++)
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{
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auto p = level.portalGroups[i];
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double xdisp = p->mDisplacement.X;
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double ydisp = p->mDisplacement.Y;
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Printf(PRINT_LOG, "Portal #%d, %s, displacement = (%f,%f)\n", i, p->plane==0? "floor":"ceiling",
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xdisp, ydisp);
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Printf(PRINT_LOG, "Coverage:\n");
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for(auto &sub : level.subsectors)
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{
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auto port = sub.render_sector->GetPortalGroup(p->plane);
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if (port == p)
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{
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Printf(PRINT_LOG, "\tSubsector %d (%d):\n\t\t", sub.Index(), sub.render_sector->sectornum);
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for(unsigned k = 0;k< sub.numlines; k++)
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{
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Printf(PRINT_LOG, "(%.3f,%.3f), ", sub.firstline[k].v1->fX() + xdisp, sub.firstline[k].v1->fY() + ydisp);
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}
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Printf(PRINT_LOG, "\n\t\tCovered by subsectors:\n");
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FPortalCoverage *cov = &sub.portalcoverage[p->plane];
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for(int l = 0;l< cov->sscount; l++)
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{
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subsector_t *csub = &level.subsectors[cov->subsectors[l]];
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Printf(PRINT_LOG, "\t\t\t%5d (%4d): ", cov->subsectors[l], csub->render_sector->sectornum);
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for(unsigned m = 0;m< csub->numlines; m++)
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{
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Printf(PRINT_LOG, "(%.3f,%.3f), ", csub->firstline[m].v1->fX(), csub->firstline[m].v1->fY());
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}
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Printf(PRINT_LOG, "\n");
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}
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}
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}
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}
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}
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