/** * OpenAL cross platform audio library * Copyright (C) 2014 by Timothy Arceri . * 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 #include #include "alu.h" #include "defs.h" template<> const ALfloat *Resample_(const InterpState*, const ALfloat *RESTRICT src, ALsizei frac, ALint increment, const al::span dst) { 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); 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])}; auto dst_iter = dst.begin(); const auto aligned_end = (dst.size()&~3) + dst_iter; while(dst_iter != aligned_end) { 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_iter, out); dst_iter += 4; 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); while(dst_iter != dst.end()) { *(dst_iter++) = lerp(src[pos], src[pos+1], frac * (1.0f/FRACTIONONE)); frac += increment; pos += frac>>FRACTIONBITS; frac &= FRACTIONMASK; } return dst.begin(); }