/// <summary>
/// Encode a block of signed values.
/// </summary>
/// <returns></returns>
public BC4SBlock EncodeSigned()
{
//load the input and scan for the boundary condition
ClampAndFindRange(-1F, 1F);
bool hasEndPoint = minValue == -1F || maxValue == 1F;
//find a span across the space
float r0, r1;
SpanValues(out r0, out r1, hasEndPoint, true);
//roundtrip it through integer format
var ret = new BC4SBlock();
ret.R0 = Helpers.FloatToSNorm(r0);
ret.R1 = Helpers.FloatToSNorm(r1);
ret.GetPalette(interpValues);
ret.PackedValue |= FindClosest();
return(ret);
}
/// <summary>
/// Encode a block of signed values.
/// </summary>
/// <returns></returns>
public BC4SBlock EncodeSigned()
{
//load the input and scan for the boundary condition
ClampAndFindRange( -1F, 1F );
bool hasEndPoint = minValue == -1F || maxValue == 1F;
//find a span across the space
float r0, r1;
SpanValues( out r0, out r1, hasEndPoint, true );
//roundtrip it through integer format
var ret = new BC4SBlock();
ret.R0 = Helpers.FloatToSNorm( r0 );
ret.R1 = Helpers.FloatToSNorm( r1 );
ret.GetPalette( interpValues );
ret.PackedValue |= FindClosest();
return ret;
}