public static TerrainPatch.Header DecodePatchHeader(BitPack bitpack)
{
TerrainPatch.Header header = new TerrainPatch.Header {
QuantWBits = bitpack.UnpackBits(8)
};
// Quantized word bits
if (header.QuantWBits == END_OF_PATCHES)
{
return(header);
}
// DC offset
header.DCOffset = bitpack.UnpackFloat();
// Range
header.Range = bitpack.UnpackBits(16);
// Patch IDs (10 bits)
header.PatchIDs = bitpack.UnpackBits(10);
// Word bits
header.WordBits = (uint)((header.QuantWBits & 0x0f) + 2);
return(header);
}
public void BitUnpacking()
{
byte[] data = new byte[] { 0x80, 0x00, 0x0F, 0x50, 0x83, 0x7D };
BitPack bitpacker = new BitPack(data, 0);
int b = bitpacker.UnpackBits(1);
Assert.IsTrue(b == 1, "Unpacked " + b + " instead of 1");
b = bitpacker.UnpackBits(1);
Assert.IsTrue(b == 0, "Unpacked " + b + " instead of 0");
bitpacker = new BitPack(data, 2);
b = bitpacker.UnpackBits(4);
Assert.IsTrue(b == 0, "Unpacked " + b + " instead of 0");
b = bitpacker.UnpackBits(8);
Assert.IsTrue(b == 0xF5, "Unpacked " + b + " instead of 0xF5");
b = bitpacker.UnpackBits(4);
Assert.IsTrue(b == 0, "Unpacked " + b + " instead of 0");
b = bitpacker.UnpackBits(10);
Assert.IsTrue(b == 0x0183, "Unpacked " + b + " instead of 0x0183");
}
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");
}
public static void DecodePatch(int[] patches, BitPack bitpack, TerrainPatch.Header header, int size)
{
int temp;
for (int n = 0; n < size * size; n++)
{
// ?
temp = bitpack.UnpackBits(1);
if (temp != 0)
{
// Value or EOB
temp = bitpack.UnpackBits(1);
if (temp != 0)
{
// Value
temp = bitpack.UnpackBits(1);
if (temp != 0)
{
// Negative
temp = bitpack.UnpackBits((int)header.WordBits);
patches[n] = temp * -1;
}
else
{
// Positive
temp = bitpack.UnpackBits((int)header.WordBits);
patches[n] = temp;
}
}
else
{
// Set the rest to zero
// TODO: This might not be necessary
for (int o = n; o < size * size; o++)
{
patches[o] = 0;
}
break;
}
}
else
{
patches[n] = 0;
}
}
}
private void UpdateParcelOverlay(SceneParcel parcel)
{
BitPack bitmap = new BitPack(parcel.Bitmap, 0);
for (int y = 0; y < 64; y++)
{
for (int x = 0; x < 64; x++)
{
if (bitmap.UnpackBits(1) != 0)
{
m_parcelOverlay[y * 64 + x] = parcel.LocalID;
}
}
}
}
public static int GetParcelArea(SceneParcel parcel, out Vector3 aabbMin, out Vector3 aabbMax)
{
int minX = 64;
int minY = 64;
int maxX = 0;
int maxY = 0;
int area = 0;
System.Diagnostics.Debug.Assert(parcel.Bitmap != null);
System.Diagnostics.Debug.Assert(parcel.Bitmap.Length == 512);
BitPack bitmap = new BitPack(parcel.Bitmap, 0);
for (int y = 0; y < 64; y++)
{
for (int x = 0; x < 64; x++)
{
if (bitmap.UnpackBits(1) != 0)
{
int x4 = x * 4;
int y4 = y * 4;
if (minX > x4)
{
minX = x4;
}
if (minY > y4)
{
minY = y4;
}
if (maxX < x4)
{
maxX = x4;
}
if (maxX < y4)
{
maxY = y4;
}
area += 16;
}
}
}
aabbMin = new Vector3(minX, minY, 0f);
aabbMax = new Vector3(maxX, maxY, 0f);
return(area);
}
public void SplitParcel(SceneParcel parcel, int startX, int endX, int startY, int endY)
{
SceneParcel newParcel = new SceneParcel(parcel);
newParcel.ID = UUID.Random();
newParcel.LocalID = System.Threading.Interlocked.Increment(ref m_currentParcelID);
newParcel.ClaimDate = DateTime.UtcNow;
newParcel.Dwell = 0f;
m_parcels.Add(newParcel.ID, newParcel.LocalID, newParcel);
// Update parcel bitmaps
BitPack origParcelBitmap = new BitPack(parcel.Bitmap, 0);
BitPack parcelBitmap = new BitPack(new byte[512], 0);
BitPack newParcelBitmap = new BitPack(newParcel.Bitmap, 0);
for (int y = 0; y < 64; y++)
{
for (int x = 0; x < 64; x++)
{
bool origParcelBit = (origParcelBitmap.UnpackBits(1) != 0);
if (x >= startX && x <= endX && y >= startY && y <= endY)
{
// Inside the new parcel
parcelBitmap.PackBit(false);
newParcelBitmap.PackBit(true);
m_parcelOverlay[y * 64 + x] = newParcel.LocalID;
}
else
{
// Not inside the new parcel
parcelBitmap.PackBit(origParcelBit);
newParcelBitmap.PackBit(false);
}
}
}
// Update parcel landing info
SceneParcel landingParcel;
if (TryGetParcel(newParcel.LandingLocation, out landingParcel) && landingParcel == parcel)
{
newParcel.Landing = LandingType.None;
newParcel.LandingLocation = Vector3.Zero;
}
else
{
parcel.Landing = LandingType.None;
parcel.LandingLocation = Vector3.Zero;
}
// Update max prim counts
Vector3 aabbMin, aabbMax;
int area = GetParcelArea(parcel, out aabbMin, out aabbMax);
parcel.MaxPrims = (int)Math.Round((float)area * m_primsPerSquareMeter);
area = GetParcelArea(newParcel, out aabbMin, out aabbMax);
newParcel.MaxPrims = (int)Math.Round((float)area * m_primsPerSquareMeter);
Serialize();
}