1 files changed, 84 insertions, 0 deletions
diff --git a/alc/mixer/mixer_sse2.cpp b/alc/mixer/mixer_sse2.cpp
new file mode 100644
index 00000000..b5d00106
--- /dev/null
+++ b/alc/mixer/mixer_sse2.cpp
@@ -0,0 +1,84 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2014 by Timothy Arceri <[email protected]>.
+ * 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 <xmmintrin.h>
+#include <emmintrin.h>
+
+#include "alu.h"
+#include "defs.h"
+
+
+template<>
+const ALfloat *Resample_<LerpTag,SSE2Tag>(const InterpState*, const ALfloat *RESTRICT src,
+    ALsizei frac, ALint increment, ALfloat *RESTRICT dst, ALsizei dstlen)
+{
+    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);
+    ASSUME(dstlen >= 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])};
+
+    const ALsizei todo{dstlen & ~3};
+    for(ALsizei i{0};i < todo;i += 4)
+    {
+        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[i], out);
+
+        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);
+
+    for(ALsizei i{todo};i < dstlen;++i)
+    {
+        dst[i] = lerp(src[pos], src[pos+1], frac * (1.0f/FRACTIONONE));
+
+        frac += increment;
+        pos  += frac>>FRACTIONBITS;
+        frac &= FRACTIONMASK;
+    }
+    return dst;
+}