83 lines
2.9 KiB
C
83 lines
2.9 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 "mixer_defs.h"
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const ALfloat *Resample_lerp32_SSE2(const BsincState* UNUSED(state), const ALfloat *restrict src,
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ALuint frac, ALuint increment, ALfloat *restrict dst,
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ALuint numsamples)
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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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union { alignas(16) ALuint i[4]; float f[4]; } pos_;
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union { alignas(16) ALuint i[4]; float f[4]; } frac_;
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__m128i frac4, pos4;
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ALuint pos;
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ALuint i;
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InitiatePositionArrays(frac, increment, frac_.i, pos_.i, 4);
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frac4 = _mm_castps_si128(_mm_load_ps(frac_.f));
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pos4 = _mm_castps_si128(_mm_load_ps(pos_.f));
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for(i = 0;numsamples-i > 3;i += 4)
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{
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const __m128 val1 = _mm_setr_ps(src[pos_.i[0]], src[pos_.i[1]], src[pos_.i[2]], src[pos_.i[3]]);
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const __m128 val2 = _mm_setr_ps(src[pos_.i[0]+1], src[pos_.i[1]+1], src[pos_.i[2]+1], src[pos_.i[3]+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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_mm_store_ps(pos_.f, _mm_castsi128_ps(pos4));
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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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pos = pos_.i[0];
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frac = _mm_cvtsi128_si32(frac4);
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for(;i < numsamples;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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