Source/System/Image/Squish/simd_ve.h

   1 /* -----------------------------------------------------------------------------
   2
   3         Copyright (c) 2006 Simon Brown                          si@sjbrown.co.uk
   4
   5         Permission is hereby granted, free of charge, to any person obtaining
   6         a copy of this software and associated documentation files (the
   7         "Software"), to deal in the Software without restriction, including
   8         without limitation the rights to use, copy, modify, merge, publish,
   9         distribute, sublicense, and/or sell copies of the Software, and to
  10         permit persons to whom the Software is furnished to do so, subject to
  11         the following conditions:
  12
  13         The above copyright notice and this permission notice shall be included
  14         in all copies or substantial portions of the Software.
  15
  16         THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17         OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18         MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  19         IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  20         CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  21         TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  22         SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23
  24    -------------------------------------------------------------------------- */
  25
  26 #ifndef SQUISH_SIMD_VE_H
  27 #define SQUISH_SIMD_VE_H
  28
  29 #include <altivec.h>
  30 #undef bool
  31
  32 namespace osgsquish {
  33
  34 #define VEC4_CONST( X ) Vec4( ( vector float )( X ) )
  35
  36 class Vec4
  37 {
  38 public:
  39         typedef Vec4 Arg;
  40
  41         Vec4() {}
  42
  43         explicit Vec4( vector float v ) : m_v( v ) {}
  44
  45         Vec4( Vec4 const& arg ) : m_v( arg.m_v ) {}
  46
  47         Vec4& operator=( Vec4 const& arg )
  48         {
  49                 m_v = arg.m_v;
  50                 return *this;
  51         }
  52
  53         explicit Vec4( float s )
  54         {
  55                 union { vector float v; float c[4]; } u;
  56                 u.c[0] = s;
  57                 u.c[1] = s;
  58                 u.c[2] = s;
  59                 u.c[3] = s;
  60                 m_v = u.v;
  61         }
  62
  63         Vec4( float x, float y, float z, float w )
  64         {
  65                 union { vector float v; float c[4]; } u;
  66                 u.c[0] = x;
  67                 u.c[1] = y;
  68                 u.c[2] = z;
  69                 u.c[3] = w;
  70                 m_v = u.v;
  71         }
  72
  73         Vec3 GetVec3() const
  74         {
  75                 union { vector float v; float c[4]; } u;
  76                 u.v = m_v;
  77                 return Vec3( u.c[0], u.c[1], u.c[2] );
  78         }
  79
  80         Vec4 SplatX() const { return Vec4( vec_splat( m_v, 0 ) ); }
  81         Vec4 SplatY() const { return Vec4( vec_splat( m_v, 1 ) ); }
  82         Vec4 SplatZ() const { return Vec4( vec_splat( m_v, 2 ) ); }
  83         Vec4 SplatW() const { return Vec4( vec_splat( m_v, 3 ) ); }
  84
  85         Vec4& operator+=( Arg v )
  86         {
  87                 m_v = vec_add( m_v, v.m_v );
  88                 return *this;
  89         }
  90
  91         Vec4& operator-=( Arg v )
  92         {
  93                 m_v = vec_sub( m_v, v.m_v );
  94                 return *this;
  95         }
  96
  97         Vec4& operator*=( Arg v )
  98         {
  99                 m_v = vec_madd( m_v, v.m_v, ( vector float )( -0.0f ) );
 100                 return *this;
 101         }
 102
 103         friend Vec4 operator+( Vec4::Arg left, Vec4::Arg right  )
 104         {
 105                 return Vec4( vec_add( left.m_v, right.m_v ) );
 106         }
 107
 108         friend Vec4 operator-( Vec4::Arg left, Vec4::Arg right  )
 109         {
 110                 return Vec4( vec_sub( left.m_v, right.m_v ) );
 111         }
 112
 113         friend Vec4 operator*( Vec4::Arg left, Vec4::Arg right  )
 114         {
 115                 return Vec4( vec_madd( left.m_v, right.m_v, ( vector float )( -0.0f ) ) );
 116         }
 117
 118         //! Returns a*b + c
 119         friend Vec4 MultiplyAdd( Vec4::Arg a, Vec4::Arg b, Vec4::Arg c )
 120         {
 121                 return Vec4( vec_madd( a.m_v, b.m_v, c.m_v ) );
 122         }
 123
 124         //! Returns -( a*b - c )
 125         friend Vec4 NegativeMultiplySubtract( Vec4::Arg a, Vec4::Arg b, Vec4::Arg c )
 126         {
 127                 return Vec4( vec_nmsub( a.m_v, b.m_v, c.m_v ) );
 128         }
 129
 130         friend Vec4 Reciprocal( Vec4::Arg v )
 131         {
 132                 // get the reciprocal estimate
 133                 vector float estimate = vec_re( v.m_v );
 134
 135                 // one round of Newton-Rhaphson refinement
 136                 vector float diff = vec_nmsub( estimate, v.m_v, ( vector float )( 1.0f ) );
 137                 return Vec4( vec_madd( diff, estimate, estimate ) );
 138         }
 139
 140         friend Vec4 Min( Vec4::Arg left, Vec4::Arg right )
 141         {
 142                 return Vec4( vec_min( left.m_v, right.m_v ) );
 143         }
 144
 145         friend Vec4 Max( Vec4::Arg left, Vec4::Arg right )
 146         {
 147                 return Vec4( vec_max( left.m_v, right.m_v ) );
 148         }
 149
 150         friend Vec4 Truncate( Vec4::Arg v )
 151         {
 152                 return Vec4( vec_trunc( v.m_v ) );
 153         }
 154
 155         friend bool CompareAnyLessThan( Vec4::Arg left, Vec4::Arg right )
 156         {
 157                 return vec_any_lt( left.m_v, right.m_v ) != 0;
 158         }
 159
 160 private:
 161         vector float m_v;
 162 };
 163
 164 } // namespace squish
 165
 166 #endif // ndef SQUISH_SIMD_VE_H