1 // Copyright 2015 Emilie Gillet. 2 // 3 // Author: Emilie Gillet (emilie.o.gillet@gmail.com) 4 // 5 // Permission is hereby granted, free of charge, to any person obtaining a copy 6 // of this software and associated documentation files (the "Software"), to deal 7 // in the Software without restriction, including without limitation the rights 8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 // copies of the Software, and to permit persons to whom the Software is 10 // furnished to do so, subject to the following conditions: 11 // 12 // The above copyright notice and this permission notice shall be included in 13 // all copies or substantial portions of the Software. 14 // 15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 // THE SOFTWARE. 22 // 23 // See http://creativecommons.org/licenses/MIT/ for more information. 24 // 25 // ----------------------------------------------------------------------------- 26 // 27 // Linear interpolation of parameters in rendering loops. 28 29 #ifndef STMLIB_DSP_PARAMETER_INTERPOLATOR_H_ 30 #define STMLIB_DSP_PARAMETER_INTERPOLATOR_H_ 31 32 #include "stmlib/stmlib.h" 33 34 namespace stmlib { 35 36 class ParameterInterpolator { 37 public: ParameterInterpolator()38 ParameterInterpolator() { } ParameterInterpolator(float * state,float new_value,size_t size)39 ParameterInterpolator(float* state, float new_value, size_t size) { 40 Init(state, new_value, size); 41 } 42 ParameterInterpolator(float * state,float new_value,float step)43 ParameterInterpolator(float* state, float new_value, float step) { 44 state_ = state; 45 value_ = *state; 46 increment_ = (new_value - *state) * step; 47 } 48 ~ParameterInterpolator()49 ~ParameterInterpolator() { 50 *state_ = value_; 51 } 52 Init(float * state,float new_value,size_t size)53 inline void Init(float* state, float new_value, size_t size) { 54 state_ = state; 55 value_ = *state; 56 increment_ = (new_value - *state) / static_cast<float>(size); 57 } 58 Next()59 inline float Next() { 60 value_ += increment_; 61 return value_; 62 } 63 subsample(float t)64 inline float subsample(float t) { 65 return value_ + increment_ * t; 66 } 67 68 private: 69 float* state_; 70 float value_; 71 float increment_; 72 }; 73 74 } // namespace stmlib 75 76 #endif // STMLIB_DSP_PARAMETER_INTERPOLATOR_H_ 77