🛠️🐜 Antkeeper superbuild with dependencies included
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86 lines
3.0 KiB
86 lines
3.0 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 "alu.h"
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#include "defs.h"
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template<>
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const ALfloat *Resample_<LerpTag,SSE4Tag>(const InterpState* UNUSED(state),
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const ALfloat *RESTRICT src, ALsizei frac, ALint increment,
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ALfloat *RESTRICT dst, ALsizei dstlen)
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{
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const __m128i increment4{_mm_set1_epi32(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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ASSUME(frac > 0);
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ASSUME(increment > 0);
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ASSUME(dstlen >= 0);
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alignas(16) ALsizei pos_[4], frac_[4];
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InitiatePositionArrays(frac, increment, frac_, pos_, 4);
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__m128i frac4{_mm_setr_epi32(frac_[0], frac_[1], frac_[2], frac_[3])};
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__m128i pos4{_mm_setr_epi32(pos_[0], pos_[1], pos_[2], pos_[3])};
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const ALsizei todo{dstlen & ~3};
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for(ALsizei i{0};i < todo;i += 4)
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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[i], out);
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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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/* NOTE: These four elements represent the position *after* the last four
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* samples, so the lowest element is the next position to resample.
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*/
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ALsizei pos{_mm_cvtsi128_si32(pos4)};
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frac = _mm_cvtsi128_si32(frac4);
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for(ALsizei i{todo};i < dstlen;++i)
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{
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dst[i] = lerp(src[pos], src[pos+1], frac * (1.0f/FRACTIONONE));
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frac += increment;
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pos += frac>>FRACTIONBITS;
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frac &= FRACTIONMASK;
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}
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return dst;
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}
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