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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 "alnumeric.h"
#include "defs.h"
struct SSE2Tag;
struct LerpTag;
#if defined(__GNUC__) && !defined(__clang__) && !defined(__SSE2__)
#pragma GCC target("sse2")
#endif
template<>
void Resample_<LerpTag,SSE2Tag>(const InterpState*, const float *RESTRICT src, uint frac,
const uint increment, const al::span<float> dst)
{
ASSUME(frac < MixerFracOne);
const __m128i increment4{_mm_set1_epi32(static_cast<int>(increment*4))};
const __m128 fracOne4{_mm_set1_ps(1.0f/MixerFracOne)};
const __m128i fracMask4{_mm_set1_epi32(MixerFracMask)};
alignas(16) std::array<uint,4> pos_, frac_;
InitPosArrays(frac, increment, al::span{frac_}, al::span{pos_});
__m128i frac4{_mm_setr_epi32(static_cast<int>(frac_[0]), static_cast<int>(frac_[1]),
static_cast<int>(frac_[2]), static_cast<int>(frac_[3]))};
__m128i pos4{_mm_setr_epi32(static_cast<int>(pos_[0]), static_cast<int>(pos_[1]),
static_cast<int>(pos_[2]), static_cast<int>(pos_[3]))};
auto dst_iter = dst.begin();
for(size_t todo{dst.size()>>2};todo;--todo)
{
const int pos0{_mm_cvtsi128_si32(pos4)};
const int pos1{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 4))};
const int pos2{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 8))};
const int pos3{_mm_cvtsi128_si32(_mm_srli_si128(pos4, 12))};
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, MixerFracBits));
frac4 = _mm_and_si128(frac4, fracMask4);
}
if(size_t todo{dst.size()&3})
{
src += static_cast<uint>(_mm_cvtsi128_si32(pos4));
frac = static_cast<uint>(_mm_cvtsi128_si32(frac4));
do {
*(dst_iter++) = lerpf(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
frac += increment;
src += frac>>MixerFracBits;
frac &= MixerFracMask;
} while(--todo);
}
}
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