🛠️🐜 Antkeeper superbuild with dependencies included
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94 lines
3.4 KiB
94 lines
3.4 KiB
/**
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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 <smmintrin.h>
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#include "alnumeric.h"
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#include "defs.h"
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struct SSE4Tag;
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struct LerpTag;
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#if defined(__GNUC__) && !defined(__clang__) && !defined(__SSE4_1__)
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#pragma GCC target("sse4.1")
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#endif
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template<>
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float *Resample_<LerpTag,SSE4Tag>(const InterpState*, float *RESTRICT src, uint frac,
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uint 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/MixerFracOne)};
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const __m128i fracMask4{_mm_set1_epi32(MixerFracMask)};
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alignas(16) uint pos_[4], frac_[4];
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InitPosArrays(frac, increment, frac_, pos_);
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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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for(size_t todo{dst.size()>>2};todo;--todo)
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{
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const int pos0{_mm_extract_epi32(pos4, 0)};
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const int pos1{_mm_extract_epi32(pos4, 1)};
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const int pos2{_mm_extract_epi32(pos4, 2)};
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const int pos3{_mm_extract_epi32(pos4, 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, MixerFracBits));
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frac4 = _mm_and_si128(frac4, fracMask4);
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}
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if(size_t todo{dst.size()&3})
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{
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/* NOTE: These four elements represent the position *after* the last
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* four samples, so the lowest element is the next position to
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* resample.
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*/
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src += static_cast<uint>(_mm_cvtsi128_si32(pos4));
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frac = static_cast<uint>(_mm_cvtsi128_si32(frac4));
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do {
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*(dst_iter++) = lerpf(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
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frac += increment;
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src += frac>>MixerFracBits;
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frac &= MixerFracMask;
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} while(--todo);
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}
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return dst.data();
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}
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