private static int EncodePatchHeader(BitPack output, TerrainPatch.Header header, int[] patch, int RegionSizeX,
int RegionSizeY, int wbits)
{
// better check
if (wbits > 17)
{
wbits = 16;
}
else if (wbits < 3)
{
wbits = 3;
}
header.QuantWBits &= 0xf0;
header.QuantWBits |= (wbits - 2);
output.PackBits(header.QuantWBits, 8);
output.PackFloat(header.DCOffset);
output.PackBits(header.Range, 16);
if (RegionSizeX > Constants.RegionSize || RegionSizeY > Constants.RegionSize)
{
output.PackBits(header.PatchIDs, 32);
}
else
{
output.PackBits(header.PatchIDs, 10);
}
return(wbits);
}
public void BitPacking()
{
byte[] packedBytes = new byte[12];
BitPack bitpacker = new BitPack(packedBytes, 0);
bitpacker.PackBits(0x0ABBCCDD, 32);
bitpacker.PackBits(25, 5);
bitpacker.PackFloat(123.321f);
bitpacker.PackBits(1000, 16);
bitpacker = new BitPack(packedBytes, 0);
int b = bitpacker.UnpackBits(32);
Assert.IsTrue(b == 0x0ABBCCDD, "Unpacked " + b + " instead of 2864434397");
b = bitpacker.UnpackBits(5);
Assert.IsTrue(b == 25, "Unpacked " + b + " instead of 25");
float f = bitpacker.UnpackFloat();
Assert.IsTrue(f == 123.321f, "Unpacked " + f + " instead of 123.321");
b = bitpacker.UnpackBits(16);
Assert.IsTrue(b == 1000, "Unpacked " + b + " instead of 1000");
}
private static int EncodePatchHeader(BitPack output, TerrainPatch.Header header, int[] patch, int RegionSizeX,
int RegionSizeY, int wbits)
{
/*
* int temp;
* int wbits = (header.QuantWBits & 0x0f) + 2;
* uint maxWbits = (uint)wbits + 5;
* uint minWbits = ((uint)wbits >> 1);
* int wbitsMaxValue;
*/
// goal is to determ minimum number of bits to use so all data fits
/*
* wbits = (int)minWbits;
* wbitsMaxValue = (1 << wbits);
*
* for (int i = 0; i < patch.Length; i++)
* {
* temp = patch[i];
* if (temp != 0)
* {
* // Get the absolute value
* if (temp < 0) temp *= -1;
*
* no coments..
*
* for (int j = (int)maxWbits; j > (int)minWbits; j--)
* {
* if ((temp & (1 << j)) != 0)
* {
* if (j > wbits) wbits = j;
* break;
* }
* }
*
* while (temp > wbitsMaxValue)
* {
* wbits++;
* if (wbits == maxWbits)
* goto Done;
* wbitsMaxValue = 1 << wbits;
* }
* }
* }
*
* Done:
*
* // wbits += 1;
*/
// better check
if (wbits > 17)
{
wbits = 16;
}
else if (wbits < 3)
{
wbits = 3;
}
header.QuantWBits &= 0xf0;
header.QuantWBits |= (wbits - 2);
output.PackBits(header.QuantWBits, 8);
output.PackFloat(header.DCOffset);
output.PackBits(header.Range, 16);
if (RegionSizeX > Constants.RegionSize || RegionSizeY > Constants.RegionSize)
{
output.PackBits(header.PatchIDs, 32);
}
else
{
output.PackBits(header.PatchIDs, 10);
}
return(wbits);
}
