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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: 13 дек. 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_INTERPOLATION_LINEAR_H_
#define PRIVATE_DSP_ARCH_GENERIC_INTERPOLATION_LINEAR_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 lin_inter_set(float *dst, int32_t x0, float y0, int32_t x1, float y1, int32_t x, uint32_t n)
{
float dy = (y1 - y0) / float(x1 - x0);
x -= x0;
for (size_t i=0; i<n; ++i, ++x)
dst[i] = (x * dy + y0);
}
void lin_inter_mul2(float *dst, int32_t x0, float y0, int32_t x1, float y1, int32_t x, uint32_t n)
{
float dy = (y1 - y0) / float(x1 - x0);
x -= x0;
for (size_t i=0; i<n; ++i, ++x)
dst[i] *= (x * dy + y0);
}
void lin_inter_mul3(float *dst, const float *src, int32_t x0, float y0, int32_t x1, float y1, int32_t x, uint32_t n)
{
float dy = (y1 - y0) / float(x1 - x0);
x -= x0;
for (size_t i=0; i<n; ++i, ++x)
dst[i] = src[i] * (x * dy + y0);
}
void lin_inter_fmadd2(float *dst, const float *src, int32_t x0, float y0, int32_t x1, float y1, int32_t x, uint32_t n)
{
float dy = (y1 - y0) / float(x1 - x0);
x -= x0;
for (size_t i=0; i<n; ++i, ++x)
dst[i] += src[i]*(x * dy + y0);
}
void lin_inter_frmadd2(float *dst, const float *src, int32_t x0, float y0, int32_t x1, float y1, int32_t x, uint32_t n)
{
float dy = (y1 - y0) / float(x1 - x0);
x -= x0;
for (size_t i=0; i<n; ++i, ++x)
dst[i] = dst[i]*(x * dy + y0) + src[i];
}
void lin_inter_fmadd3(float *dst, const float *src1, const float *src2, int32_t x0, float y0, int32_t x1, float y1, int32_t x, uint32_t n)
{
float dy = (y1 - y0) / float(x1 - x0);
x -= x0;
for (size_t i=0; i<n; ++i, ++x)
dst[i] = src1[i]*(x * dy + y0) + src2[i];
}
}
}
#endif /* PRIVATE_DSP_ARCH_GENERIC_INTERPOLATION_LINEAR_H_ */
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