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/**
* OpenAL cross platform audio library
* Copyright (C) 2014 by Timothy Arceri <t_arceri@yahoo.com.au>.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <xmmintrin.h>
#include <emmintrin.h>
#include <smmintrin.h>
#include "alu.h"
#include "defs.h"
template<>
const ALfloat *Resample_<LerpTag,SSE4Tag>(const InterpState*, const ALfloat *RESTRICT src,
ALuint frac, ALint increment, const al::span<float> dst)
{
const __m128i increment4{_mm_set1_epi32(increment*4)};
const __m128 fracOne4{_mm_set1_ps(1.0f/FRACTIONONE)};
const __m128i fracMask4{_mm_set1_epi32(FRACTIONMASK)};
ASSUME(increment > 0);
alignas(16) ALsizei pos_[4], frac_[4];
InitiatePositionArrays(frac, increment, frac_, pos_, 4);
__m128i frac4{_mm_setr_epi32(frac_[0], frac_[1], frac_[2], frac_[3])};
__m128i pos4{_mm_setr_epi32(pos_[0], pos_[1], pos_[2], pos_[3])};
auto dst_iter = dst.begin();
const auto aligned_end = (dst.size()&~3) + dst_iter;
while(dst_iter != aligned_end)
{
const int pos0{_mm_extract_epi32(pos4, 0)};
const int pos1{_mm_extract_epi32(pos4, 1)};
const int pos2{_mm_extract_epi32(pos4, 2)};
const int pos3{_mm_extract_epi32(pos4, 3)};
const __m128 val1{_mm_setr_ps(src[pos0 ], src[pos1 ], src[pos2 ], src[pos3 ])};
const __m128 val2{_mm_setr_ps(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
/* val1 + (val2-val1)*mu */
const __m128 r0{_mm_sub_ps(val2, val1)};
const __m128 mu{_mm_mul_ps(_mm_cvtepi32_ps(frac4), fracOne4)};
const __m128 out{_mm_add_ps(val1, _mm_mul_ps(mu, r0))};
_mm_store_ps(dst_iter, out);
dst_iter += 4;
frac4 = _mm_add_epi32(frac4, increment4);
pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, FRACTIONBITS));
frac4 = _mm_and_si128(frac4, fracMask4);
}
/* NOTE: These four elements represent the position *after* the last four
* samples, so the lowest element is the next position to resample.
*/
src += static_cast<ALuint>(_mm_cvtsi128_si32(pos4));
frac = _mm_cvtsi128_si32(frac4);
while(dst_iter != dst.end())
{
*(dst_iter++) = lerp(src[0], src[1], frac * (1.0f/FRACTIONONE));
frac += increment;
src += frac>>FRACTIONBITS;
frac &= FRACTIONMASK;
}
return dst.begin();
}
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