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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-lib
* Created on: 31 мар. 2020 г.
*
* lsp-dsp-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-lib 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_DSP_ARCH_GENERIC_GRAPHICS_INTERPOLATION_H_
#define PRIVATE_DSP_ARCH_GENERIC_GRAPHICS_INTERPOLATION_H_
#ifndef PRIVATE_DSP_ARCH_GENERIC_IMPL
#error "This header should not be included directly"
#endif /* PRIVATE_DSP_ARCH_GENERIC_IMPL */
namespace lsp
{
namespace generic
{
void smooth_cubic_linear(float *dst, float start, float stop, size_t count)
{
float dy = stop - start;
float nx = 1.0f / (count + 1); // Normalizing x
for (size_t i=0; i<count; ++i)
{
float x = i * nx;
*(dst++) = start + dy * x*x * (3.0f - 2.0f * x);
}
}
void smooth_cubic_log(float *dst, float start, float stop, size_t count)
{
float dy = logf(stop/start);
float nx = 1.0f / (count + 1); // Normalizing x
for (size_t i=0; i<count; ++i)
{
float x = i * nx;
*(dst++) = start * expf(dy * x*x * (3.0f - 2.0f * x));
}
}
}
}
#endif /* PRIVATE_DSP_ARCH_GENERIC_GRAPHICS_INTERPOLATION_H_ */
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