119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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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#ifndef MATH_UTILS_H
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#define MATH_UTILS_H
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#include "common/scummsys.h"
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#ifndef FLT_MIN
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#define FLT_MIN 1E-37f
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#endif
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#ifndef FLT_MAX
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#define FLT_MAX 1E+37f
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#endif
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namespace Math {
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/** A complex number. */
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struct Complex {
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float re, im;
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};
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/* Math::epsilon is a constant with a small value which is used for comparing
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* floating point numbers.
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*
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* The value is based on the previous hard-coded numbers in
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* Line2d.cpp. Smaller numbers could be used unless they are
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* smaller than the float granularity.
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*/
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static const float epsilon = 0.0001f;
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// Round a number towards zero
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// Input and Output type can be different
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template<class InputT, class OutputT>
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inline OutputT trunc(InputT x) {
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return (x > 0) ? floor(x) : ceil(x);
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}
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// Round a number towards zero
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// Input and Output type are the same
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template<class T>
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inline T trunc(T x) {
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return trunc<T,T>(x);
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}
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// Convert radians to degrees
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// Input and Output type can be different
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// Upconvert everything to floats
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template<class InputT, class OutputT>
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inline OutputT rad2deg(InputT rad) {
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return (OutputT)( (float)rad * (float)57.2957795130823); // 180.0/M_PI = 57.2957795130823
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}
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// Handle the case differently when the input type is double
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template<class OutputT>
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inline OutputT rad2deg(double rad) {
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return (OutputT)( rad * 57.2957795130823);
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}
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// Convert radians to degrees
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// Input and Output type are the same
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template<class T>
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inline T rad2deg(T rad) {
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return rad2deg<T,T>(rad);
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}
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// Convert degrees to radians
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// Input and Output type can be different
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// Upconvert everything to floats
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template<class InputT, class OutputT>
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inline OutputT deg2rad(InputT deg) {
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return (OutputT)( (float)deg * (float)0.0174532925199433); // M_PI/180.0 = 0.0174532925199433
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}
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// Handle the case differently when the input type is double
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template<>
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inline double deg2rad<double, double>(double deg) {
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return ( deg * 0.0174532925199433);
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}
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// Convert degrees to radians
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// Input and Output type are the same
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template<class T>
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inline T deg2rad(T deg) {
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return deg2rad<T,T>(deg);
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}
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template<class T>
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inline T hypotenuse(T xv, T yv) {
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return (T)sqrt((double)(xv * xv + yv * yv));
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}
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inline float square(float x) {
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return x * x;
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}
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}
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#endif
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