mathlib_extra.h

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/*
Copyright (C) 2002-2025 UFO: Alien Invasion.
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
See the GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
 
#pragma once
 
#include "ufotypes.h"
#include "mathlib.h"

#ifndef DENORM
#define DENORM 0.0000000001
#endif
#ifndef DENORM_INV
#define DENORM_INV (1.0 - (DENORM))
#endif

#ifndef ChkDNorm
#define ChkDNorm(fpVal) ((fpVal) == 0.0 ? (DENORM) : (fpVal) )
#endif

#ifndef ChkDNorm_Inv
#define ChkDNorm_Inv(fpVal) ( ((fpVal) == 1.0) ? (DENORM_INV) : (fpVal) )
#endif

 
/* Basic curves */
double FpCurveUp(double fpVal, double mEffect);
double FpCurveDn(double fpVal, double mEffect);
 
/* "RS" = "Rapid Start", curve has a different, skewed shape */
double FpCurveUpRs(double fpVal, double mEffect);
double FpCurveDnRs(double fpVal, double mEffect);

/* "cntPnt" = center point, function curves "fpVal" TOWARD "cntPnt" */
double FpCurve1D_u_in(double fpVal, double mEffect, double cntPnt);
/* "cntPnt" = center point, function curves "fpVal" AWAY FROM "cntPnt" */
double FpCurve1D_u_out(double fpVal, double mEffect, double cntPnt);

 
/* Function curves "fpVal" AWAY FROM 0.0, toward 1.0f or -1.0f */
double FpCurve1D_s_out(double fpVal, double mEffect);

float FpUcurve_f(const float inpVal, const float hard);
double FpUcurve_d(const double inpVal, const double hard);
 
float FpUcurveSc_f(const float inpVal, const float hard, const float scale);
double FpUcurveSc_d(const double inpVal, const double hard, const double scale);