public ClusterFit(ColourSet colours, SquishFlags flags)
: base(colours, flags)
{
// set the iteration count
m_iterationCount = ((m_flags & SquishFlags.kColourIterativeClusterFit) != 0) ? kMaxIterations : 1;
// initialise the best error
m_besterror = Vector4.one * float.MaxValue;
// initialise the metric
bool perceptual = ((m_flags & SquishFlags.kColourMetricPerceptual) != 0);
if (perceptual)
{
m_metric = new Vector4(0.2126f, 0.7152f, 0.0722f, 0.0f);
}
else
{
m_metric = Vector4.one;
}
// cache some values
int count = m_colours.GetCount();
Vector3[] values = m_colours.GetPoints();
// get the covariance matrix
Sym3x3 covariance = math.ComputeWeightedCovariance(count, values, m_colours.GetWeights());
// compute the principle component
m_principle = math.ComputePrincipleComponent(covariance);
}
public RangeFit( ColourSet colours, SquishFlags flags )
: base(colours, flags)
{
// initialise the metric
bool perceptual = ( ( m_flags & SquishFlags.kColourMetricPerceptual ) != 0 );
if( perceptual )
m_metric = new Vector3( 0.2126f, 0.7152f, 0.0722f );
else
m_metric = Vector3.one;
// initialise the best error
m_besterror = float.MaxValue;
// cache some values
int count = m_colours.GetCount();
Vector3[] values = m_colours.GetPoints();
float[] weights = m_colours.GetWeights();
// get the covariance matrix
Sym3x3 covariance = math.ComputeWeightedCovariance( count, values, weights );
// compute the principle component
Vector3 principle = math.ComputePrincipleComponent( covariance );
// get the min and max range as the codebook endpoints
Vector3 start = Vector3.zero;
Vector3 end = Vector3.zero;
if( count > 0 )
{
float min, max;
// compute the range
start = end = values[0];
min = max = Vector3.Dot( values[0], principle );
for( int i = 1; i < count; ++i )
{
float val = Vector3.Dot( values[i], principle );
if( val < min )
{
start = values[i];
min = val;
}
else if( val > max )
{
end = values[i];
max = val;
}
}
}
// clamp the output to [0, 1]
start = Vector3.Min( Vector3.one,Vector3.Max( Vector3.zero, start ) );
end = Vector3.Min( Vector3.one, Vector3.Max( Vector3.zero, end ) );
// clamp to the grid and save
Vector3 half = Vector3.one*( 0.5f );
m_start = Vector3.Scale(math.Truncate( Vector3.Scale(grid,start) + half ),gridrcp);
m_end = Vector3.Scale(math.Truncate( Vector3.Scale(grid,end) + half ),gridrcp);
}
static unsafe void CompressMasked(byte[] rgba, int mask, byte *pBlock, SquishFlags flags)
{
// fix any bad flags
flags = FixFlags(flags);
// get the block locations
byte *colourBlock = pBlock;
byte *alphaBock = pBlock;
if ((flags & (SquishFlags.kDxt3 | SquishFlags.kDxt5)) != 0)
{
colourBlock = pBlock + 8;
}
// create the minimal point set
ColourSet colours = new ColourSet(rgba, mask, flags);
// check the compression type and compress colour
if (colours.GetCount() == 1)
{
// always do a single colour fit
SingleColourFit fit = new SingleColourFit(colours, flags);
fit.Compress(colourBlock);
}
else if ((flags & SquishFlags.kColourRangeFit) != 0 || colours.GetCount() == 0)
{
// do a range fit
RangeFit fit = new RangeFit(colours, flags);
fit.Compress(colourBlock);
}
else
{
// default to a cluster fit (could be iterative or not)
ClusterFit fit = new ClusterFit(colours, flags);
fit.Compress(colourBlock);
}
// compress alpha separately if necessary
if ((flags & SquishFlags.kDxt3) != 0)
{
alpha.CompressAlphaDxt3(rgba, mask, alphaBock);
}
else if ((flags & SquishFlags.kDxt5) != 0)
{
alpha.CompressAlphaDxt5(rgba, mask, alphaBock);
}
}
public ColourFit(ColourSet colours, SquishFlags flags)
{
m_colours = colours;
m_flags = flags;
}
public SingleColourFit( ColourSet colours, SquishFlags flags )
: base(colours, flags)
{
// grab the single colour
Vector3[] values = m_colours.GetPoints();
m_colour[0] = ( byte )FloatToInt( 255.0f*values[0].x, 255 );
m_colour[1] = ( byte )FloatToInt( 255.0f*values[0].y, 255 );
m_colour[2] = ( byte )FloatToInt( 255.0f*values[0].z, 255 );
// initialise the best error
m_besterror = int.MaxValue;
}
public RangeFit(ColourSet colours, SquishFlags flags)
: base(colours, flags)
{
// initialise the metric
bool perceptual = ((m_flags & SquishFlags.kColourMetricPerceptual) != 0);
if (perceptual)
{
m_metric = new Vector3(0.2126f, 0.7152f, 0.0722f);
}
else
{
m_metric = Vector3.one;
}
// initialise the best error
m_besterror = float.MaxValue;
// cache some values
int count = m_colours.GetCount();
Vector3[] values = m_colours.GetPoints();
float[] weights = m_colours.GetWeights();
// get the covariance matrix
Sym3x3 covariance = math.ComputeWeightedCovariance(count, values, weights);
// compute the principle component
Vector3 principle = math.ComputePrincipleComponent(covariance);
// get the min and max range as the codebook endpoints
Vector3 start = Vector3.zero;
Vector3 end = Vector3.zero;
if (count > 0)
{
float min, max;
// compute the range
start = end = values[0];
min = max = Vector3.Dot(values[0], principle);
for (int i = 1; i < count; ++i)
{
float val = Vector3.Dot(values[i], principle);
if (val < min)
{
start = values[i];
min = val;
}
else if (val > max)
{
end = values[i];
max = val;
}
}
}
// clamp the output to [0, 1]
start = Vector3.Min(Vector3.one, Vector3.Max(Vector3.zero, start));
end = Vector3.Min(Vector3.one, Vector3.Max(Vector3.zero, end));
// clamp to the grid and save
Vector3 half = Vector3.one * (0.5f);
m_start = Vector3.Scale(math.Truncate(Vector3.Scale(grid, start) + half), gridrcp);
m_end = Vector3.Scale(math.Truncate(Vector3.Scale(grid, end) + half), gridrcp);
}
static unsafe void CompressMasked(byte[] rgba, int mask, byte* pBlock, SquishFlags flags)
{
// fix any bad flags
flags = FixFlags(flags);
// get the block locations
byte* colourBlock = pBlock;
byte* alphaBock = pBlock;
if ((flags & (SquishFlags.kDxt3 | SquishFlags.kDxt5)) != 0)
colourBlock = pBlock + 8;
// create the minimal point set
ColourSet colours = new ColourSet(rgba, mask, flags);
// check the compression type and compress colour
if (colours.GetCount() == 1)
{
// always do a single colour fit
SingleColourFit fit = new SingleColourFit(colours, flags);
fit.Compress(colourBlock);
}
else if ((flags & SquishFlags.kColourRangeFit) != 0 || colours.GetCount() == 0)
{
// do a range fit
RangeFit fit = new RangeFit(colours, flags);
fit.Compress(colourBlock);
}
else
{
// default to a cluster fit (could be iterative or not)
ClusterFit fit = new ClusterFit(colours, flags);
fit.Compress(colourBlock);
}
// compress alpha separately if necessary
if ((flags & SquishFlags.kDxt3) != 0)
{
alpha.CompressAlphaDxt3(rgba, mask, alphaBock);
}
else if ((flags & SquishFlags.kDxt5) != 0)
{
alpha.CompressAlphaDxt5(rgba, mask, alphaBock);
}
}
public ColourFit(ColourSet colours, SquishFlags flags)
{
m_colours = colours;
m_flags = flags;
}
