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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 "alu.h"
#include "defs.h"
template<>
const ALfloat *Resample_<LerpTag,SSE2Tag>(const InterpState* UNUSED(state),
const ALfloat *RESTRICT src, ALsizei frac, ALint increment,
ALfloat *RESTRICT dst, ALsizei dstlen)
{
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(frac > 0);
ASSUME(increment > 0);
ASSUME(dstlen >= 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])};
const ALsizei todo{dstlen & ~3};
for(ALsizei i{0};i < todo;i += 4)
{
const int pos0{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(0, 0, 0, 0)))};
const int pos1{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(1, 1, 1, 1)))};
const int pos2{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(2, 2, 2, 2)))};
const int pos3{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(3, 3, 3, 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[i], out);
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.
*/
ALsizei pos{_mm_cvtsi128_si32(pos4)};
frac = _mm_cvtsi128_si32(frac4);
for(ALsizei i{todo};i < dstlen;++i)
{
dst[i] = lerp(src[pos], src[pos+1], frac * (1.0f/FRACTIONONE));
frac += increment;
pos += frac>>FRACTIONBITS;
frac &= FRACTIONMASK;
}
return dst;
}
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