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Merge optimizations from official squish relese.

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pull/216/head
castano 16 years ago
parent f29d7dd938
commit fd73484bfc
1 changed files with 41 additions and 44 deletions
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85
src/nvtt/squish/weightedclusterfit.cpp
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@ -135,6 +135,8 @@ void WeightedClusterFit::Compress3( void* block )
Vec4 const zero = VEC4_CONST(0.0f);
Vec4 const half(0.5f, 0.5f, 0.5f, 0.25f);
Vec4 const two = VEC4_CONST(2.0);
Vec4 const grid( 31.0f, 63.0f, 31.0f, 0.0f );
Vec4 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f, 0.0f );
// declare variables
Vec4 beststart = VEC4_CONST( 0.0f );
@ -173,24 +175,21 @@ void WeightedClusterFit::Compress3( void* block )
Vec4 a = NegativeMultiplySubtract(betax_sum, alphabeta_sum, alphax_sum*beta2_sum) * factor;
Vec4 b = NegativeMultiplySubtract(alphax_sum, alphabeta_sum, betax_sum*alpha2_sum) * factor;
// clamp the output to [0, 1]
// clamp to the grid
a = Min( one, Max( zero, a ) );
b = Min( one, Max( zero, b ) );
// clamp to the grid
Vec4 const grid( 31.0f, 63.0f, 31.0f, 0.0f );
Vec4 const gridrcp( 0.03227752766457f, 0.01583151765563f, 0.03227752766457f, 0.0f );
a = Truncate( MultiplyAdd( grid, a, half ) ) * gridrcp;
b = Truncate( MultiplyAdd( grid, b, half ) ) * gridrcp;
// compute the error
Vec4 e1 = MultiplyAdd( a, alphax_sum, b*betax_sum );
Vec4 e2 = MultiplyAdd( a*a, alpha2_sum, b*b*beta2_sum );
Vec4 e3 = MultiplyAdd( a*b*alphabeta_sum - e1, two, e2 );
// compute the error (we skip the constant xxsum)
Vec4 e1 = MultiplyAdd( a*a, alpha2_sum, b*b*beta2_sum );
Vec4 e2 = NegativeMultiplySubtract( a, alphax_sum, a*b*alphabeta_sum );
Vec4 e3 = NegativeMultiplySubtract( b, betax_sum, e2 );
Vec4 e4 = MultiplyAdd( two, e3, e1 );
// apply the metric to the error term
Vec4 e4 = e3 * m_metricSqr;
Vec4 error = e4.SplatX() + e4.SplatY() + e4.SplatZ();
Vec4 e5 = e4 * m_metricSqr;
Vec4 error = e5.SplatX() + e5.SplatY() + e5.SplatZ();
// keep the solution if it wins
if( CompareAnyLessThan( error, besterror ) )
@ -250,6 +249,9 @@ void WeightedClusterFit::Compress4( void* block )
Vec4 const two = VEC4_CONST(2.0);
Vec4 const onethird( 1.0f/3.0f, 1.0f/3.0f, 1.0f/3.0f, 1.0f/9.0f );
Vec4 const twothirds( 2.0f/3.0f, 2.0f/3.0f, 2.0f/3.0f, 4.0f/9.0f );
Vec4 const twonineths = VEC4_CONST( 2.0f/9.0f );
Vec4 const grid( 31.0f, 63.0f, 31.0f, 0.0f );
Vec4 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f, 0.0f );
// declare variables
Vec4 beststart = VEC4_CONST( 0.0f );
@ -274,16 +276,16 @@ void WeightedClusterFit::Compress4( void* block )
//Vec3 const alphax_sum = x0 + x1 * (2.0f / 3.0f) + x2 * (1.0f / 3.0f);
//float const alpha2_sum = w0 + w1 * (4.0f/9.0f) + w2 * (1.0f/9.0f);
Vec4 const alphax_sum = x0 + MultiplyAdd(x1, twothirds, x2 * onethird); // alphax_sum, alpha2_sum
Vec4 const alphax_sum = MultiplyAdd(x2, onethird, MultiplyAdd(x1, twothirds, x0)); // alphax_sum, alpha2_sum
Vec4 const alpha2_sum = alphax_sum.SplatW();
//Vec3 const betax_sum = x3 + x2 * (2.0f / 3.0f) + x1 * (1.0f / 3.0f);
//float const beta2_sum = w3 + w2 * (4.0f/9.0f) + w1 * (1.0f/9.0f);
Vec4 const betax_sum = x3 + MultiplyAdd(x2, twothirds, x1 * onethird); // betax_sum, beta2_sum
Vec4 const betax_sum = MultiplyAdd(x2, twothirds, MultiplyAdd(x1, onethird, x3)); // betax_sum, beta2_sum
Vec4 const beta2_sum = betax_sum.SplatW();
//float const alphabeta_sum = w1 * (2.0f/9.0f) + w2 * (2.0f/9.0f);
Vec4 const alphabeta_sum = two * (x1 * onethird + x2 * onethird).SplatW(); // alphabeta_sum
//float const alphabeta_sum = (w1 + w2) * (2.0f/9.0f);
Vec4 const alphabeta_sum = twonineths*( x1 + x2 ).SplatW(); // alphabeta_sum
// float const factor = 1.0f / (alpha2_sum * beta2_sum - alphabeta_sum * alphabeta_sum);
Vec4 const factor = Reciprocal( NegativeMultiplySubtract(alphabeta_sum, alphabeta_sum, alpha2_sum*beta2_sum) );
@ -291,24 +293,21 @@ void WeightedClusterFit::Compress4( void* block )
Vec4 a = NegativeMultiplySubtract(betax_sum, alphabeta_sum, alphax_sum*beta2_sum) * factor;
Vec4 b = NegativeMultiplySubtract(alphax_sum, alphabeta_sum, betax_sum*alpha2_sum) * factor;
// clamp the output to [0, 1]
// clamp to the grid
a = Min( one, Max( zero, a ) );
b = Min( one, Max( zero, b ) );
// clamp to the grid
Vec4 const grid( 31.0f, 63.0f, 31.0f, 0.0f );
Vec4 const gridrcp( 0.03227752766457f, 0.01583151765563f, 0.03227752766457f, 0.0f );
a = Truncate( MultiplyAdd( grid, a, half ) ) * gridrcp;
b = Truncate( MultiplyAdd( grid, b, half ) ) * gridrcp;
// compute the error
Vec4 e1 = MultiplyAdd( a, alphax_sum, b*betax_sum );
Vec4 e2 = MultiplyAdd( a*a, alpha2_sum, b*b*beta2_sum );
Vec4 e3 = MultiplyAdd( a*b*alphabeta_sum - e1, two, e2 );
// compute the error (we skip the constant xxsum)
Vec4 e1 = MultiplyAdd( a*a, alpha2_sum, b*b*beta2_sum );
Vec4 e2 = NegativeMultiplySubtract( a, alphax_sum, a*b*alphabeta_sum );
Vec4 e3 = NegativeMultiplySubtract( b, betax_sum, e2 );
Vec4 e4 = MultiplyAdd( two, e3, e1 );
// apply the metric to the error term
Vec4 e4 = e3 * m_metricSqr;
Vec4 error = e4.SplatX() + e4.SplatY() + e4.SplatZ();
Vec4 e5 = e4 * m_metricSqr;
Vec4 error = e5.SplatX() + e5.SplatY() + e5.SplatZ();
// keep the solution if it wins
if( CompareAnyLessThan( error, besterror ) )
@ -368,6 +367,12 @@ void WeightedClusterFit::Compress4( void* block )
void WeightedClusterFit::Compress3( void* block )
{
Vec3 const one( 1.0f );
Vec3 const zero( 0.0f );
Vec3 const half( 0.5f );
Vec3 const grid( 31.0f, 63.0f, 31.0f );
Vec3 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f );
// declare variables
Vec3 beststart( 0.0f );
Vec3 bestend( 0.0f );
@ -400,16 +405,9 @@ void WeightedClusterFit::Compress3( void* block )
Vec3 a = (alphax_sum*beta2_sum - betax_sum*alphabeta_sum) * factor;
Vec3 b = (betax_sum*alpha2_sum - alphax_sum*alphabeta_sum) * factor;
// clamp the output to [0, 1]
Vec3 const one( 1.0f );
Vec3 const zero( 0.0f );
// clamp to the grid
a = Min( one, Max( zero, a ) );
b = Min( one, Max( zero, b ) );
// clamp to the grid
Vec3 const grid( 31.0f, 63.0f, 31.0f );
Vec3 const gridrcp( 0.03227752766457f, 0.01583151765563f, 0.03227752766457f );
Vec3 const half( 0.5f );
a = Floor( grid*a + half )*gridrcp;
b = Floor( grid*b + half )*gridrcp;
@ -470,6 +468,12 @@ void WeightedClusterFit::Compress3( void* block )
void WeightedClusterFit::Compress4( void* block )
{
Vec3 const one( 1.0f );
Vec3 const zero( 0.0f );
Vec3 const half( 0.5f );
Vec3 const grid( 31.0f, 63.0f, 31.0f );
Vec3 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f );
// declare variables
Vec3 beststart( 0.0f );
Vec3 bestend( 0.0f );
@ -505,16 +509,9 @@ void WeightedClusterFit::Compress4( void* block )
Vec3 a = ( alphax_sum*beta2_sum - betax_sum*alphabeta_sum )*factor;
Vec3 b = ( betax_sum*alpha2_sum - alphax_sum*alphabeta_sum )*factor;
// clamp the output to [0, 1]
Vec3 const one( 1.0f );
Vec3 const zero( 0.0f );
// clamp to the grid
a = Min( one, Max( zero, a ) );
b = Min( one, Max( zero, b ) );
// clamp to the grid
Vec3 const grid( 31.0f, 63.0f, 31.0f );
Vec3 const gridrcp( 0.03227752766457f, 0.01583151765563f, 0.03227752766457f );
Vec3 const half( 0.5f );
a = Floor( grid*a + half )*gridrcp;
b = Floor( grid*b + half )*gridrcp;

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