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40 lines
1.7 KiB
C
40 lines
1.7 KiB
C
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017 Edouard Griffiths, F4EXB //
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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 as version 3 of the License, or //
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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 V3 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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#ifndef SDRBASE_UTIL_STEPFUNCTIONS_H_
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#define SDRBASE_UTIL_STEPFUNCTIONS_H_
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class StepFunctions
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{
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public:
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static float smootherstep(float x)
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{
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if (x == 1.0f) {
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return 1.0f;
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} else if (x == 0.0f) {
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return 0.0f;
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}
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double x3 = x * x * x;
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double x4 = x * x3;
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double x5 = x * x4;
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return (float) (6.0*x5 - 15.0*x4 + 10.0*x3);
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}
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};
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#endif /* SDRBASE_UTIL_STEPFUNCTIONS_H_ */
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