static void FindClosestUNORM(ref BC4_UNORM pBC, float[] theTexelsU)
{
UInt32 NUM_PIXELS_PER_BLOCK = 16;
float[] rGradient = new float[8];
for (UInt32 i = 0; i < 8; ++i)
{
rGradient[i] = pBC.DecodeFromIndex(i);
}
for (UInt32 i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
{
UInt32 uBestIndex = 0;
float fBestDelta = 100000;
for (UInt32 uIndex = 0; uIndex < 8; uIndex++)
{
float fCurrentDelta = Math.Abs(rGradient[uIndex] - theTexelsU[i]);
if (fCurrentDelta < fBestDelta)
{
uBestIndex = uIndex;
fBestDelta = fCurrentDelta;
}
}
pBC.SetIndex((int)i, (int)uBestIndex);
}
}
public static void D3DXEncodeBC4U(ref UInt64 resultantBlock, float[] refData, List <float> theTexelsU)
{
var pBC4 = new BC4_UNORM();
FindEndPointsBC4U(theTexelsU, theTexelsU.Count, ref pBC4.red_0, ref pBC4.red_1);
FindClosestUNORM(ref pBC4, refData);
resultantBlock = pBC4.data;
}
public static void D3DXDecodeBC4U(ref float[] pColor, UInt64 pBC)
{
UInt32 NUM_PIXELS_PER_BLOCK = 16;
var pBC4 = new BC4_UNORM();
pBC4.data = pBC;
for (int i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
{
pColor[i] = pBC4.R(i);
}
}
public static void D3DXDecodeBC4U(ref float[] pColor, ulong pBC)
{
uint NUM_PIXELS_PER_BLOCK = 16;
var pBC4 = new BC4_UNORM
{
Data = pBC
};
for (var i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
{
pColor[i] = pBC4.R(i);
}
}
