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79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
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#include "build.h"
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#include "pragmas.h"
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#include "common_game.h"
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//-------------------------------------------------------------------------
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/*
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Copyright (C) 2010-2019 EDuke32 developers and contributors
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Copyright (C) 2019 Nuke.YKT
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This file is part of NBlood.
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NBlood is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License version 2
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as published by the Free Software Foundation.
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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.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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//-------------------------------------------------------------------------
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#include "resource.h"
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#include "trig.h"
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int costable[2048];
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int OctantTable[8] = { 5, 6, 2, 1, 4, 7, 3, 0 };
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int GetOctant(int x, int y)
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{
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int vc = klabs(x)-klabs(y);
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return OctantTable[7-(x<0)-(y<0)*2-(vc<0)*4];
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}
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void RotateVector(int *dx, int *dy, int nAngle)
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{
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int ox = *dx;
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int oy = *dy;
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*dx = dmulscale30r(ox, Cos(nAngle), -oy, Sin(nAngle));
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*dy = dmulscale30r(ox, Sin(nAngle), oy, Cos(nAngle));
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}
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void RotatePoint(int *x, int *y, int nAngle, int ox, int oy)
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{
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int dx = *x-ox;
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int dy = *y-oy;
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*x = ox+dmulscale30r(dx, Cos(nAngle), -dy, Sin(nAngle));
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*y = oy+dmulscale30r(dx, Sin(nAngle), dy, Cos(nAngle));
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}
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void trigInit(Resource &Res)
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{
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DICTNODE *pTable = Res.Lookup("cosine","dat");
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if (!pTable)
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ThrowError("Cosine table not found");
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if (pTable->size != 2048)
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ThrowError("Cosine table incorrect size");
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memcpy(costable, Res.Load(pTable), pTable->size);
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#if B_BIG_ENDIAN == 1
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for (int i = 0; i < 512; i++)
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{
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costable[i] = B_LITTLE32(costable[i]);
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}
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#endif
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costable[512] = 0;
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for (int i = 513; i <= 1024; i++)
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{
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costable[i] = -costable[1024-i];
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}
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for (int i = 1025; i < 2048; i++)
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{
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costable[i] = costable[2048 - i];
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}
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}
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