public BC2ABlock Encode()
{
//clamp the values into range
for( int i = 0; i < 16; i++ )
{
var v = values[i];
if( v < 0 ) values[i] = 0;
else if( v > 1 ) values[i] = 1;
}
//encode, optionally dithering as we go
bool dither = Dither;
BC2ABlock ret = new BC2ABlock();
if( dither )
{
if( error == null )
error = new float[16];
else
Array.Clear( error, 0, 16 );
}
for( int i = 0; i < values.Length; i++ )
{
float v = values[i];
if( dither )
v += error[i];
int u = (int)(v * 15F + 0.5F);
ret.PackedValue|= (ulong)u << (i * 4);
if( dither )
{
float d = v - u * (1F / 15F);
if( (i & 3) != 3 )
error[i + 1] += d * (7F / 16F);
if( i < 12 )
{
if( (i & 3) != 0 )
error[i + 3] += d * (3F / 16F);
error[i + 4] += d * (5F / 16F);
if( (i & 3) != 3 )
error[i + 5] += d * (1F / 16F);
}
}
}
return ret;
}
public BC2ABlock Encode()
{
//clamp the values into range
for (int i = 0; i < 16; i++)
{
var v = values[i];
if (v < 0)
{
values[i] = 0;
}
else if (v > 1)
{
values[i] = 1;
}
}
//encode, optionally dithering as we go
bool dither = Dither;
BC2ABlock ret = new BC2ABlock();
if (dither)
{
if (error == null)
{
error = new float[16];
}
else
{
Array.Clear(error, 0, 16);
}
}
for (int i = 0; i < values.Length; i++)
{
float v = values[i];
if (dither)
{
v += error[i];
}
int u = (int)(v * 15F + 0.5F);
ret.PackedValue |= (ulong)u << (i * 4);
if (dither)
{
float d = v - u * (1F / 15F);
if ((i & 3) != 3)
{
error[i + 1] += d * (7F / 16F);
}
if (i < 12)
{
if ((i & 3) != 0)
{
error[i + 3] += d * (3F / 16F);
}
error[i + 4] += d * (5F / 16F);
if ((i & 3) != 3)
{
error[i + 5] += d * (1F / 16F);
}
}
}
}
return(ret);
}
