Initial commit of Command & Conquer Generals and Command & Conquer Generals Zero Hour source code.
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Generals/Code/GameEngine/Include/Common/QuickTrig.h
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158
Generals/Code/GameEngine/Include/Common/QuickTrig.h
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/*
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** Command & Conquer Generals(tm)
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** Copyright 2025 Electronic Arts Inc.
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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 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 General Public License for more details.
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**
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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, see <http://www.gnu.org/licenses/>.
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*/
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////////////////////////////////////////////////////////////////////////////////
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// //
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// (c) 2001-2003 Electronic Arts Inc. //
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// //
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////////////////////////////////////////////////////////////////////////////////
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// FILE: QuickTrig.h ////////////////////////////////////////////////////////////////////////////////
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// Author: Mark Lorenzen (adapted by srj)
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// Desc: fast trig
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef __QUICKTRIG_H_
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#define __QUICKTRIG_H_
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// INCLUDES ///////////////////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------------
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extern Real TheQuickSinTable[];
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extern Real TheQuickTanTable[];
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// yes, Real. No, really.
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extern Real TheQuickSinTableCount;
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extern Real TheQuickTanTableCount;
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//-----------------------------------------------------------------------------
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#define QUARTER_CIRCLE (PI/2)
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//-----------------------------------------------------------------------------
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// quick magnitude estimation, without the square root
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// NOTE, this is a very rough estimate, and may be off by 10% or more, so
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// use it only when you don't need accuracy
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//-----------------------------------------------------------------------------
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inline Real QMag(Real x, Real y, Real z)
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{
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Real sTempV;
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Real sMaxV = fabs(x);
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Real sMedV = fabs(y);
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Real sMinV = fabs(z);
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if (sMaxV < sMedV)
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{
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sTempV = sMaxV;
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sMaxV = sMedV;
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sMedV = sTempV;
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}
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if (sMaxV < sMinV)
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{
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sTempV = sMaxV;
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sMaxV = sMinV;
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sMinV = sTempV;
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}
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sMedV += sMinV;
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sMaxV += (sMedV*0.25f);
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return sMaxV;
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}
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//-----------------------------------------------------------------------------
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// table based trig functions
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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inline Real QSin(Real a)
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{
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register Real angle = a;
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register long sgn = 1;
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if (angle < 0) // DO POSITIVE MATH AND PRESERVE SIGN
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{
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sgn = -1;
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angle = -angle;
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}
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while ( angle > (PI)) // MODULATE ANGLE INTO RANGE OF PI
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{
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angle -= PI;
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sgn = -sgn;
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}
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if (angle > PI/2)
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{
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angle = PI - angle; // FLIP
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}
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register int index = REAL_TO_INT((angle/QUARTER_CIRCLE) * TheQuickTanTableCount);
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register Real x = TheQuickSinTable[index];
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return x * sgn;
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/*
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Real remainder = node - index;
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Real next = TheQuickSinTable[index + 1];
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Real range = next - x;
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Real scalar = remainder / SIN_TABLE_BRACKET;
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Real finetune = scalar * range;
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x += finetune;
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*/
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}
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//-----------------------------------------------------------------------------
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inline Real QCos(Real angle)
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{
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return QSin((QUARTER_CIRCLE) - angle);
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}
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//-----------------------------------------------------------------------------
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inline Real QTan(Real angle)
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{
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return TheQuickTanTable[REAL_TO_INT(angle * TheQuickSinTableCount)];
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}
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//-----------------------------------------------------------------------------
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inline Real QCsc(Real angle)
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{
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return 1.0f / QSin(angle);
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}
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//-----------------------------------------------------------------------------
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inline Real QSec(Real angle)
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{
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return 1.0f / QCos(angle);
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}
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//-----------------------------------------------------------------------------
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inline Real QCot(Real angle)
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{
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return 1.0f / QTan(angle);
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}
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#endif
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