mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-06 00:41:17 -05:00
40 lines
1.7 KiB
C
40 lines
1.7 KiB
C
|
///////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// Copyright (C) 2017 Edouard Griffiths, F4EXB //
|
||
|
|
// //
|
||
|
|
// 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 as version 3 of the License, or //
|
||
|
|
// //
|
||
|
|
// 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 V3 for more details. //
|
||
|
|
// //
|
||
|
|
// You should have received a copy of the GNU General Public License //
|
||
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
||
|
|
///////////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
#ifndef SDRBASE_UTIL_STEPFUNCTIONS_H_
|
||
|
|
#define SDRBASE_UTIL_STEPFUNCTIONS_H_
|
||
|
|
|
||
|
|
class StepFunctions
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
static float smootherstep(float x)
|
||
|
|
{
|
||
|
|
if (x == 1.0f) {
|
||
|
|
return 1.0f;
|
||
|
|
} else if (x == 0.0f) {
|
||
|
|
return 0.0f;
|
||
|
|
}
|
||
|
|
|
||
|
|
double x3 = x * x * x;
|
||
|
|
double x4 = x * x3;
|
||
|
|
double x5 = x * x4;
|
||
|
|
|
||
|
|
return (float) (6.0*x5 - 15.0*x4 + 10.0*x3);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* SDRBASE_UTIL_STEPFUNCTIONS_H_ */
|