mirror of
https://github.com/ZDoom/raze-gles.git
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325 lines
9.4 KiB
C++
325 lines
9.4 KiB
C++
/*
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** sectorgeometry.cpp
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**
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** caches the triangle meshes used for rendering sector planes.
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**
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**---------------------------------------------------------------------------
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** Copyright 2021 Christoph Oelckers
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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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**
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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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*/
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#include "sectorgeometry.h"
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#include "build.h"
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#include "gamefuncs.h"
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#include "texturemanager.h"
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#include "earcut.hpp"
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SectorGeometry sectorGeometry;
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//==========================================================================
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//
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// CalcPlane fixme - this should be stored in the sector, not be recalculated each frame.
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//
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//==========================================================================
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static FVector3 CalcNormal(sectortype* sector, int plane)
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{
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FVector3 pt[3];
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auto wal = &wall[sector->wallptr];
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auto wal2 = &wall[wal->point2];
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pt[0] = { (float)WallStartX(wal), (float)WallStartY(wal), 0 };
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pt[1] = { (float)WallEndX(wal), (float)WallEndY(wal), 0 };
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PlanesAtPoint(sector, wal->x, wal->y, plane ? &pt[0].Z : nullptr, plane? nullptr : &pt[0].Z);
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PlanesAtPoint(sector, wal2->x, wal2->y, plane ? &pt[1].Z : nullptr, plane ? nullptr : &pt[1].Z);
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if (pt[0].X == pt[1].X)
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{
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if (pt[0].Y == pt[1].Y) return { 0.f, 0.f, plane ? -1.f : 1.f };
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pt[2].X = pt[0].X + 4;
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pt[2].Y = pt[0].Y;
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}
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else
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{
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pt[2].X = pt[0].X;
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pt[2].Y = pt[0].Y + 4;
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}
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PlanesAtPoint(sector, pt[2].X * 16, pt[2].Y * 16, plane ? &pt[2].Z : nullptr, plane ? nullptr : &pt[2].Z);
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auto normal = (pt[2] - pt[0]) ^ (pt[1] - pt[0]);
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if ((pt[2].Z < 0 && !plane) || (pt[2].Z > 0 && plane)) return -pt[2];
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return pt[2];
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}
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//==========================================================================
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//
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// The math used here to calculate texture positioning was derived from
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// Polymer but required several fixes for correctness.
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//
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//==========================================================================
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class UVCalculator
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{
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sectortype* sect;
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int myplane;
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int stat;
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float z1;
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int ix1;
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int iy1;
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int ix2;
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int iy2;
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float sinalign, cosalign;
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FGameTexture* tex;
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float xpanning, ypanning;
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float xscaled, yscaled;
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public:
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// Moved in from pragmas.h
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UVCalculator(sectortype* sec, int plane, FGameTexture* tx)
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{
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float xpan, ypan;
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sect = sec;
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tex = tx;
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myplane = plane;
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auto firstwall = &wall[sec->wallptr];
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ix1 = firstwall->x;
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iy1 = firstwall->y;
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ix2 = wall[firstwall->point2].x;
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iy2 = wall[firstwall->point2].y;
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if (plane == 0)
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{
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stat = sec->floorstat;
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xpan = sec->floorxpan_;
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ypan = sec->floorypan_;
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PlanesAtPoint(sec, ix1, iy1, nullptr, &z1);
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}
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else
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{
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stat = sec->ceilingstat;
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xpan = sec->ceilingxpan_;
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ypan = sec->ceilingypan_;
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PlanesAtPoint(sec, ix1, iy1, &z1, nullptr);
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}
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DVector2 dv = { double(ix2 - ix1), -double(iy2 - iy1) };
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auto vang = dv.Angle() - 90.;
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cosalign = vang.Cos();
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sinalign = vang.Sin();
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int pow2width = 1 << sizeToBits(tx->GetTexelWidth());
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if (pow2width < tx->GetTexelWidth()) pow2width *= 2;
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int pow2height = 1 << sizeToBits(tx->GetTexelHeight());
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if (pow2height < tx->GetTexelHeight()) pow2height *= 2;
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xpanning = pow2width * xpan / (256.f * tx->GetTexelWidth());
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ypanning = pow2height * ypan / (256.f * tx->GetTexelHeight());
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float scalefactor = (stat & CSTAT_SECTOR_TEXHALF) ? 8.0f : 16.0f;
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if ((stat & (CSTAT_SECTOR_SLOPE | CSTAT_SECTOR_ALIGN)) == (CSTAT_SECTOR_ALIGN))
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{
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// This is necessary to adjust for some imprecisions in the math.
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// To calculate the inverse Build performs an integer division with significant loss of precision
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// that can cause the texture to be shifted by multiple pixels.
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// The code below calculates the amount of this deviation so that it can be added back to the formula.
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int len = ksqrt(uhypsq(ix2 - ix1, iy2 - iy1));
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if (len != 0)
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{
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int i = 1048576 / len;
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scalefactor *= 1048576.f / (i * len);
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}
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}
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xscaled = scalefactor * tx->GetTexelWidth();
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yscaled = scalefactor * tx->GetTexelHeight();
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}
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FVector2 GetUV(int x, int y, float z)
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{
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float tv, tu;
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if (stat & CSTAT_SECTOR_ALIGN)
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{
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float dx = (float)(x - ix1);
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float dy = (float)(y - iy1);
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tu = -(dx * sinalign + dy * cosalign);
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tv = (dx * cosalign - dy * sinalign);
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if (stat & CSTAT_SECTOR_SLOPE)
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{
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float dz = (z - z1) * 16;
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float newtv = sqrt(tv * tv + dz * dz);
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tv = tv < 0 ? -newtv : newtv;
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}
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}
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else
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{
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tu = x;
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tv = -y;
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}
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if (stat & CSTAT_SECTOR_SWAPXY)
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std::swap(tu, tv);
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if (stat & CSTAT_SECTOR_XFLIP) tu = -tu;
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if (stat & CSTAT_SECTOR_YFLIP) tv = -tv;
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return { tu / xscaled + xpanning, tv / yscaled + ypanning };
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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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void SectorGeometry::MakeVertices(unsigned int secnum, int plane)
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{
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auto sec = §or[secnum];
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int numvertices = sec->wallnum;
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TArray<FVector3> points(numvertices, true);
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using Point = std::pair<float, float>;
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std::vector<std::vector<Point>> polygon;
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std::vector<Point>* curPoly;
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polygon.resize(1);
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curPoly = &polygon.back();
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for (int i = 0; i < numvertices; i++)
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{
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auto wal = &wall[sec->wallptr + i];
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float X = WallStartX(wal);
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float Y = WallStartY(wal);
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curPoly->push_back(std::make_pair(X, Y));
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if (wal->point2 != sec->wallptr+i+1 && i < numvertices - 1)
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{
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polygon.resize(polygon.size() + 1);
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curPoly = &polygon.back();
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}
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}
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// Now make sure that the outer boundary is the first polygon by picking a point that's as much to the outside as possible.
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int outer = 0;
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float minx = FLT_MAX;
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float miny = FLT_MAX;
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for (size_t a = 0; a < polygon.size(); a++)
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{
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for (auto& pt : polygon[a])
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{
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if (pt.first < minx || (pt.first == minx && pt.second < miny))
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{
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minx = pt.first;
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miny = pt.second;
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outer = a;
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}
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}
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}
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if (outer != 0) std::swap(polygon[0], polygon[outer]);
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auto indices = mapbox::earcut(polygon);
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int p = 0;
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for (size_t a = 0; a < polygon.size(); a++)
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{
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for (auto& pt : polygon[a])
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{
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float planez;
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PlanesAtPoint(sec, (pt.first * 16), (pt.second * -16), plane ? &planez : nullptr, !plane ? &planez : nullptr);
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FVector3 point = { pt.first, pt.second, planez };
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points[p++] = point;
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}
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}
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auto& entry = data[secnum].planes[plane];
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entry.vertices.Resize(indices.size());
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entry.texcoords.Resize(indices.size());
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entry.normal = CalcNormal(sec, plane);
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auto texture = tileGetTexture(plane ? sec->ceilingpicnum : sec->floorpicnum);
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UVCalculator uvcalc(sec, plane, texture);
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for(unsigned i = 0; i < entry.vertices.Size(); i++)
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{
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auto& pt = points[indices[i]];
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entry.vertices[i] = pt;
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entry.texcoords[i] = uvcalc.GetUV(int(pt.X * 16), int(pt.Y * -16), pt.Z);
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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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void SectorGeometry::ValidateSector(unsigned int secnum, int plane)
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{
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auto sec = §or[secnum];
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auto compare = &data[secnum].compare;
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if (plane == 0)
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{
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if (sec->floorheinum == compare->floorheinum &&
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sec->floorpicnum == compare->floorpicnum &&
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((sec->floorstat ^ compare->floorstat) & (CSTAT_SECTOR_ALIGN | CSTAT_SECTOR_YFLIP | CSTAT_SECTOR_XFLIP | CSTAT_SECTOR_TEXHALF | CSTAT_SECTOR_SWAPXY)) == 0 &&
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sec->floorxpan_ == compare->floorxpan_ &&
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sec->floorypan_ == compare->floorypan_ &&
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sec->floorz == compare->floorz &&
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!(sec->dirty & 1) && data[secnum].planes[plane].vertices.Size() ) return;
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sec->dirty &= ~1;
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}
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else
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{
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if (sec->ceilingheinum == compare->ceilingheinum &&
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sec->ceilingpicnum == compare->ceilingpicnum &&
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((sec->ceilingstat ^ compare->ceilingstat) & (CSTAT_SECTOR_ALIGN | CSTAT_SECTOR_YFLIP | CSTAT_SECTOR_XFLIP | CSTAT_SECTOR_TEXHALF | CSTAT_SECTOR_SWAPXY)) == 0 &&
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sec->ceilingxpan_ == compare->ceilingxpan_ &&
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sec->ceilingypan_ == compare->ceilingypan_ &&
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sec->ceilingz == compare->ceilingz &&
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!(sec->dirty & 2) && data[secnum].planes[plane].vertices.Size()) return;
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sec->dirty &= ~2;
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}
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*compare = *sec;
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MakeVertices(secnum, plane);
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}
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