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);
}
}
