public static float[] DecompressPatch(int[] patches, TerrainPatch.Header header, TerrainPatch.GroupHeader group)
{
float[] block = new float[group.PatchSize * group.PatchSize];
float[] output = new float[group.PatchSize * group.PatchSize];
int prequant = (header.QuantWBits >> 4) + 2;
int quantize = 1 << prequant;
float ooq = 1.0f / (float)quantize;
float mult = ooq * (float)header.Range;
float addval = mult * (float)(1 << (prequant - 1)) + header.DCOffset;
if (group.PatchSize == 16)
{
for (int n = 0; n < 16 * 16; n++)
{
block[n] = patches[CopyMatrix16[n]] * DequantizeTable16[n];
}
float[] ftemp = new float[16 * 16];
for (int o = 0; o < 16; o++)
{
IDCTColumn16(block, ftemp, o);
}
for (int o = 0; o < 16; o++)
{
IDCTLine16(ftemp, block, o);
}
}
else
{
for (int n = 0; n < 32 * 32; n++)
{
block[n] = patches[CopyMatrix32[n]] * DequantizeTable32[n];
}
Logger.Log("Implement IDCTPatchLarge", Helpers.LogLevel.Error);
}
for (int j = 0; j < block.Length; j++)
{
output[j] = block[j] * mult + addval;
}
return(output);
}
public static void CreatePatch(BitPack output, float[] patchData, int x, int y)
{
if (patchData.Length != 16 * 16)
{
throw new ArgumentException("Patch data must be a 16x16 array");
}
TerrainPatch.Header header = PrescanPatch(patchData);
header.QuantWBits = 136;
header.PatchIDs = (y & 0x1F);
header.PatchIDs += (x << 5);
// NOTE: No idea what prequant and postquant should be or what they do
int[] patch = CompressPatch(patchData, header, 10);
int wbits = EncodePatchHeader(output, header, patch);
EncodePatch(output, patch, 0, wbits);
}
public static void DecodePatch(int[] patches, BitPack bitpack, TerrainPatch.Header header, int size)
{
for (int n = 0; n < size * size; n++)
{
// ?
var 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;
}
}
}
/// <summary>
/// Add a patch of terrain to a BitPacker
/// </summary>
/// <param name="output">BitPacker to write the patch to</param>
/// <param name="heightmap">Heightmap of the simulator, must be a 256 *
/// 256 float array</param>
/// <param name="x">X offset of the patch to create, valid values are
/// from 0 to 15</param>
/// <param name="y">Y offset of the patch to create, valid values are
/// from 0 to 15</param>
public static void CreatePatchFromHeightmap(BitPack output, float[] heightmap, int x, int y)
{
if (heightmap.Length != 256 * 256)
{
throw new ArgumentException("Heightmap data must be 256x256");
}
if (x < 0 || x > 15 || y < 0 || y > 15)
{
throw new ArgumentException("X and Y patch offsets must be from 0 to 15");
}
TerrainPatch.Header header = PrescanPatch(heightmap, x, y);
header.QuantWBits = 136;
header.PatchIDs = (y & 0x1F);
header.PatchIDs += (x << 5);
// NOTE: No idea what prequant and postquant should be or what they do
int[] patch = CompressPatch(heightmap, x, y, header, 10);
int wbits = EncodePatchHeader(output, header, patch);
EncodePatch(output, patch, 0, wbits);
}
private static int[] CompressPatch(float[,] patchData, TerrainPatch.Header header, int prequant)
{
float[] block = new float[16 * 16];
int wordsize = prequant;
float oozrange = 1.0f / (float)header.Range;
float range = (float)(1 << prequant);
float premult = oozrange * range;
float sub = (float)(1 << (prequant - 1)) + header.DCOffset * premult;
header.QuantWBits = wordsize - 2;
header.QuantWBits |= (prequant - 2) << 4;
int k = 0;
for (int j = 0; j < 16; j++)
{
for (int i = 0; i < 16; i++)
{
block[k++] = patchData[j, i] * premult - sub;
}
}
float[] ftemp = new float[16 * 16];
int[] itemp = new int[16 * 16];
for (int o = 0; o < 16; o++)
{
DCTLine16(block, ftemp, o);
}
for (int o = 0; o < 16; o++)
{
DCTColumn16(ftemp, itemp, o);
}
return(itemp);
}
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;
}
// Scan the height info we're returning and return a patch packet header for this patch.
private static TerrainPatch.Header PrescanPatch(TerrainData terrData, int patchX, int patchY)
{
TerrainPatch.Header header = new TerrainPatch.Header();
float zmax = -99999999.0f;
float zmin = 99999999.0f;
for (int j = patchY*Constants.TerrainPatchSize; j < (patchY + 1)*Constants.TerrainPatchSize; j++)
{
for (int i = patchX*Constants.TerrainPatchSize; i < (patchX + 1)*Constants.TerrainPatchSize; i++)
{
float val = terrData[i, j];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
}
header.DCOffset = zmin;
header.Range = (int)((zmax - zmin) + 1.0f);
return header;
}
private static TerrainPatch.Header PrescanPatch(float[] patch)
{
TerrainPatch.Header header = new TerrainPatch.Header();
float zmax = -99999999.0f;
float zmin = 99999999.0f;
for (int i = 0; i < Constants.TerrainPatchSize*Constants.TerrainPatchSize; i++)
{
float val = patch[i];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
header.DCOffset = zmin;
header.Range = (int) ((zmax - zmin) + 1.0f);
return header;
}
private static TerrainPatch.Header PrescanPatch(float[] heightmap, int patchX, int patchY, int RegionSizeX,
int RegionSizeY)
{
TerrainPatch.Header header = new TerrainPatch.Header();
float zmax = -32767;
float zmin = 32767;
for (int j = patchY * 16; j < (patchY + 1) * 16; j++)
{
for (int i = patchX * 16; i < (patchX + 1) * 16; i++)
{
float val = heightmap[j * RegionSizeX + i];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
}
header.DCOffset = (zmin);
header.Range = (int)(((zmax - zmin)) + 1.0f);
return header;
}
private static TerrainPatch.Header PrescanPatch(float[] heightmap, int patchX, int patchY)
{
TerrainPatch.Header header = new TerrainPatch.Header();
float zmax = -99999999.0f;
float zmin = 99999999.0f;
for (int j = patchY * 16; j < (patchY + 1) * 16; j++)
{
for (int i = patchX * 16; i < (patchX + 1) * 16; i++)
{
float val = heightmap[j * 256 + i];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
}
header.DCOffset = zmin;
header.Range = (int)((zmax - zmin) + 1.0f);
return header;
}
private static TerrainPatch.Header PrescanPatch(float[,] patch)
{
TerrainPatch.Header header = new TerrainPatch.Header();
float zmax = -99999999.0f;
float zmin = 99999999.0f;
for (int j = 0; j < 16; j++)
{
for (int i = 0; i < 16; i++)
{
float val = patch[j, i];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
}
header.DCOffset = zmin;
header.Range = (int)((zmax - zmin) + 1.0f);
return header;
}
private static TerrainPatch.Header PrescanPatch(short[] heightmap, int patchX, int patchY, int RegionSizeX,
int RegionSizeY)
{
TerrainPatch.Header header = new TerrainPatch.Header();
short zmax = -32767;
short zmin = 32767;
const float iscale = 1.0f/Constants.TerrainCompression;
for (int j = patchY*16; j < (patchY + 1)*16; j++)
{
for (int i = patchX*16; i < (patchX + 1)*16; i++)
{
short val = heightmap[j*RegionSizeX + i];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
}
header.DCOffset = (zmin)*iscale;
header.Range = (int) (((zmax - zmin))*iscale + 1.0f);
return header;
}
// Scan the height info we're returning and return a patch packet header for this patch.
private static TerrainPatch.Header PrescanPatch(TerrainData terrData, int patchX, int patchY, out float frange)
{
TerrainPatch.Header header = new TerrainPatch.Header();
float zmax = float.MinValue;
float zmin = float.MaxValue;
int startx = patchX * Constants.TerrainPatchSize;
int starty = patchY * Constants.TerrainPatchSize;
for (int j = starty; j < starty + Constants.TerrainPatchSize; j++)
{
for (int i = startx; i < startx + Constants.TerrainPatchSize; i++)
{
float val = terrData[i, j];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
}
header.DCOffset = zmin;
frange = ((zmax - zmin) + 1.0f);
header.Range = (int)frange;
return header;
}
private void DecompressLand(Simulator simulator, BitPack bitpack, TerrainPatch.GroupHeader group)
{
int x;
int y;
int[] patches = new int[32 * 32];
int count = 0;
while (true)
{
TerrainPatch.Header header = TerrainCompressor.DecodePatchHeader(bitpack);
if (header.QuantWBits == TerrainCompressor.END_OF_PATCHES)
{
break;
}
x = header.X;
y = header.Y;
if (x >= TerrainCompressor.PATCHES_PER_EDGE || y >= TerrainCompressor.PATCHES_PER_EDGE)
{
Logger.Log(String.Format(
"Invalid LayerData land packet, x={0}, y={1}, dc_offset={2}, range={3}, quant_wbits={4}, patchids={5}, count={6}",
x, y, header.DCOffset, header.Range, header.QuantWBits, header.PatchIDs, count),
Helpers.LogLevel.Warning, Client);
return;
}
// Decode this patch
TerrainCompressor.DecodePatch(patches, bitpack, header, group.PatchSize);
// Decompress this patch
float[] heightmap = TerrainCompressor.DecompressPatch(patches, header, group);
count++;
if (OnLandPatch != null)
{
try { OnLandPatch(simulator, x, y, group.PatchSize, heightmap); }
catch (Exception e) { Logger.Log(e.Message, Helpers.LogLevel.Error, Client, e); }
}
if (Client.Settings.STORE_LAND_PATCHES)
{
lock (SimPatches)
{
if (!SimPatches.ContainsKey(simulator.Handle))
{
SimPatches.Add(simulator.Handle, new TerrainPatch[16 * 16]);
}
TerrainPatch patch = new TerrainPatch();
patch.Data = heightmap;
patch.X = x;
patch.Y = y;
SimPatches[simulator.Handle][y * 16 + x] = patch;
}
}
}
}
private static TerrainPatch.Header PrescanPatch(float[] heightmap, int patchX, int patchY, int RegionSizeX, int RegionSizeY)
{
TerrainPatch.Header header = new TerrainPatch.Header();
float zmax = -99999999.0f;
float zmin = 99999999.0f;
// int sqrt = (int)Math.Sqrt(heightmap.Length);
for (int j = patchY * Constants.TerrainPatchSize; j < ((patchY >= (RegionSizeY / Constants.TerrainPatchSize) ? (RegionSizeY - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchY) + 1) * Constants.TerrainPatchSize; j++)
{
for (int i = patchX * Constants.TerrainPatchSize; i < ((patchX >= (RegionSizeX / Constants.TerrainPatchSize) ? (RegionSizeX - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchX) + 1) * Constants.TerrainPatchSize; i++)
{
float val = heightmap[j * RegionSizeX + i];
if (val > zmax) zmax = val;
if (val < zmin) zmin = val;
}
}
header.DCOffset = zmin;
header.Range = (int)((zmax - zmin) + 1.0f);
return header;
}