Import code from previous AssetBuilder version

thirdparty/libsquish/simd_sse.h

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+/* -----------------------------------------------------------------------------
+
+    Copyright (c) 2006 Simon Brown                          si@sjbrown.co.uk
+
+    Permission is hereby granted, free of charge, to any person obtaining
+    a copy of this software and associated documentation files (the
+    "Software"), to deal in the Software without restriction, including
+    without limitation the rights to use, copy, modify, merge, publish,
+    distribute, sublicense, and/or sell copies of the Software, and to
+    permit persons to whom the Software is furnished to do so, subject to
+    the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+   -------------------------------------------------------------------------- */
+
+#ifndef SQUISH_SIMD_SSE_H
+#define SQUISH_SIMD_SSE_H
+
+#include <xmmintrin.h>
+#if ( SQUISH_USE_SSE > 1 )
+#include <emmintrin.h>
+#endif
+
+#define SQUISH_SSE_SPLAT( a )                                        \
+    ( ( a ) | ( ( a ) << 2 ) | ( ( a ) << 4 ) | ( ( a ) << 6 ) )
+
+#define SQUISH_SSE_SHUF( x, y, z, w )                                \
+    ( ( x ) | ( ( y ) << 2 ) | ( ( z ) << 4 ) | ( ( w ) << 6 ) )
+
+namespace squish {
+
+#define VEC4_CONST( X ) Vec4( X )
+
+class Vec4
+{
+public:
+    typedef Vec4 const& Arg;
+
+    Vec4() {}
+
+    explicit Vec4( __m128 v ) : m_v( v ) {}
+
+    Vec4( Vec4 const& arg ) : m_v( arg.m_v ) {}
+
+    Vec4& operator=( Vec4 const& arg )
+    {
+        m_v = arg.m_v;
+        return *this;
+    }
+
+    explicit Vec4( float s ) : m_v( _mm_set1_ps( s ) ) {}
+
+    Vec4( float x, float y, float z, float w ) : m_v( _mm_setr_ps( x, y, z, w ) ) {}
+
+    Vec3 GetVec3() const
+    {
+#ifdef __GNUC__
+        __attribute__ ((__aligned__ (16))) float c[4];
+#else
+        __declspec(align(16)) float c[4];
+#endif
+        _mm_store_ps( c, m_v );
+        return Vec3( c[0], c[1], c[2] );
+    }
+
+    Vec4 SplatX() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 0 ) ) ); }
+    Vec4 SplatY() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 1 ) ) ); }
+    Vec4 SplatZ() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 2 ) ) ); }
+    Vec4 SplatW() const { return Vec4( _mm_shuffle_ps( m_v, m_v, SQUISH_SSE_SPLAT( 3 ) ) ); }
+
+    Vec4& operator+=( Arg v )
+    {
+        m_v = _mm_add_ps( m_v, v.m_v );
+        return *this;
+    }
+
+    Vec4& operator-=( Arg v )
+    {
+        m_v = _mm_sub_ps( m_v, v.m_v );
+        return *this;
+    }
+
+    Vec4& operator*=( Arg v )
+    {
+        m_v = _mm_mul_ps( m_v, v.m_v );
+        return *this;
+    }
+
+    friend Vec4 operator+( Vec4::Arg left, Vec4::Arg right  )
+    {
+        return Vec4( _mm_add_ps( left.m_v, right.m_v ) );
+    }
+
+    friend Vec4 operator-( Vec4::Arg left, Vec4::Arg right  )
+    {
+        return Vec4( _mm_sub_ps( left.m_v, right.m_v ) );
+    }
+
+    friend Vec4 operator*( Vec4::Arg left, Vec4::Arg right  )
+    {
+        return Vec4( _mm_mul_ps( left.m_v, right.m_v ) );
+    }
+
+    //! Returns a*b + c
+    friend Vec4 MultiplyAdd( Vec4::Arg a, Vec4::Arg b, Vec4::Arg c )
+    {
+        return Vec4( _mm_add_ps( _mm_mul_ps( a.m_v, b.m_v ), c.m_v ) );
+    }
+
+    //! Returns -( a*b - c )
+    friend Vec4 NegativeMultiplySubtract( Vec4::Arg a, Vec4::Arg b, Vec4::Arg c )
+    {
+        return Vec4( _mm_sub_ps( c.m_v, _mm_mul_ps( a.m_v, b.m_v ) ) );
+    }
+
+    friend Vec4 Reciprocal( Vec4::Arg v )
+    {
+        // get the reciprocal estimate
+        __m128 estimate = _mm_rcp_ps( v.m_v );
+
+        // one round of Newton-Rhaphson refinement
+        __m128 diff = _mm_sub_ps( _mm_set1_ps( 1.0f ), _mm_mul_ps( estimate, v.m_v ) );
+        return Vec4( _mm_add_ps( _mm_mul_ps( diff, estimate ), estimate ) );
+    }
+
+    friend Vec4 Min( Vec4::Arg left, Vec4::Arg right )
+    {
+        return Vec4( _mm_min_ps( left.m_v, right.m_v ) );
+    }
+
+    friend Vec4 Max( Vec4::Arg left, Vec4::Arg right )
+    {
+        return Vec4( _mm_max_ps( left.m_v, right.m_v ) );
+    }
+
+    friend Vec4 Truncate( Vec4::Arg v )
+    {
+#if ( SQUISH_USE_SSE == 1 )
+        // convert to ints
+        __m128 input = v.m_v;
+        __m64 lo = _mm_cvttps_pi32( input );
+        __m64 hi = _mm_cvttps_pi32( _mm_movehl_ps( input, input ) );
+
+        // convert to floats
+        __m128 part = _mm_movelh_ps( input, _mm_cvtpi32_ps( input, hi ) );
+        __m128 truncated = _mm_cvtpi32_ps( part, lo );
+
+        // clear out the MMX multimedia state to allow FP calls later
+        _mm_empty();
+        return Vec4( truncated );
+#else
+        // use SSE2 instructions
+        return Vec4( _mm_cvtepi32_ps( _mm_cvttps_epi32( v.m_v ) ) );
+#endif
+    }
+
+    friend bool CompareAnyLessThan( Vec4::Arg left, Vec4::Arg right )
+    {
+        __m128 bits = _mm_cmplt_ps( left.m_v, right.m_v );
+        int value = _mm_movemask_ps( bits );
+        return value != 0;
+    }
+
+private:
+    __m128 m_v;
+};
+
+} // namespace squish
+
+#endif // ndef SQUISH_SIMD_SSE_H