84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2014 by Timothy Arceri <t_arceri@yahoo.com.au>.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <xmmintrin.h>
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#include <emmintrin.h>
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#include "alu.h"
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#include "defs.h"
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template<>
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const float *Resample_<LerpTag,SSE2Tag>(const InterpState*, const float *RESTRICT src, ALuint frac,
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ALuint increment, const al::span<float> dst)
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{
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const __m128i increment4{_mm_set1_epi32(static_cast<int>(increment*4))};
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const __m128 fracOne4{_mm_set1_ps(1.0f/FRACTIONONE)};
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const __m128i fracMask4{_mm_set1_epi32(FRACTIONMASK)};
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alignas(16) ALuint pos_[4], frac_[4];
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InitPosArrays(frac, increment, frac_, pos_, 4);
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__m128i frac4{_mm_setr_epi32(static_cast<int>(frac_[0]), static_cast<int>(frac_[1]),
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static_cast<int>(frac_[2]), static_cast<int>(frac_[3]))};
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__m128i pos4{_mm_setr_epi32(static_cast<int>(pos_[0]), static_cast<int>(pos_[1]),
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static_cast<int>(pos_[2]), static_cast<int>(pos_[3]))};
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auto dst_iter = dst.begin();
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const auto aligned_end = (dst.size()&~3u) + dst_iter;
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while(dst_iter != aligned_end)
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{
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const int pos0{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(0, 0, 0, 0)))};
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const int pos1{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(1, 1, 1, 1)))};
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const int pos2{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(2, 2, 2, 2)))};
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const int pos3{_mm_cvtsi128_si32(_mm_shuffle_epi32(pos4, _MM_SHUFFLE(3, 3, 3, 3)))};
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const __m128 val1{_mm_setr_ps(src[pos0 ], src[pos1 ], src[pos2 ], src[pos3 ])};
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const __m128 val2{_mm_setr_ps(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
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/* val1 + (val2-val1)*mu */
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const __m128 r0{_mm_sub_ps(val2, val1)};
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const __m128 mu{_mm_mul_ps(_mm_cvtepi32_ps(frac4), fracOne4)};
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const __m128 out{_mm_add_ps(val1, _mm_mul_ps(mu, r0))};
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_mm_store_ps(dst_iter, out);
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dst_iter += 4;
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frac4 = _mm_add_epi32(frac4, increment4);
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pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, FRACTIONBITS));
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frac4 = _mm_and_si128(frac4, fracMask4);
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}
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if(dst_iter != dst.end())
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{
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src += static_cast<ALuint>(_mm_cvtsi128_si32(pos4));
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frac = static_cast<ALuint>(_mm_cvtsi128_si32(frac4));
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do {
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*(dst_iter++) = lerp(src[0], src[1], static_cast<float>(frac) * (1.0f/FRACTIONONE));
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frac += increment;
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src += frac>>FRACTIONBITS;
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frac &= FRACTIONMASK;
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} while(dst_iter != dst.end());
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}
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return dst.data();
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}
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