static private DepthSlice MakeBaseDepthSlice(Heightmap heightmap)
{
RawDepthData rawDepthData = GetRawDepthData(heightmap, 0, heightmap.StartX - 1, heightmap.Width + 2); // <- Guarantuee missing ranges on each end (for extrapolation)
if (rawDepthData.IsBlank)
{
return(DepthSlice.CreateBlank(heightmap.StartX, heightmap.StartZ));
}
// Fill in missing data and do extrapolation:
rawDepthData.RepairMissingRanges();
int dataStart = rawDepthData.missingDataRanges[0].index + rawDepthData.missingDataRanges[0].count;
int dataEnd = rawDepthData.missingDataRanges[rawDepthData.missingDataRanges.Count - 1].index;
// Bring extrapolations into the legitimate data range:
if (rawDepthData.depthFront[dataStart - 1] == rawDepthData.depthBack[dataStart - 1])
{
dataStart--;
}
if (rawDepthData.depthFront[dataEnd] == rawDepthData.depthBack[dataEnd])
{
dataEnd++;
}
return(PackDepthSlice(ref rawDepthData, dataStart, dataEnd));
}
static DepthSlice MakeNonBaseDepthSlice(Heightmap heightmap, int yOffset, DepthSlice previousSlice)
{
Debug.Assert(yOffset != 0);
Debug.Assert(previousSlice != null);
RawDepthData rawDepthData = GetRawDepthData(heightmap, yOffset, previousSlice.xOffset, previousSlice.Width);
if (rawDepthData.IsBlank)
{
return(DepthSlice.CreateBlank(previousSlice.xOffset, previousSlice.zOffset));
}
DepthSlice depthSlice = PackDepthSlice(ref rawDepthData, 0, previousSlice.Width);
// Pull up missing data from previous layers:
foreach (var missingRange in rawDepthData.missingDataRanges)
{
for (int j = 0; j < missingRange.count; j++)
{
int i = j + missingRange.index;
var belowBounds = previousSlice.depths[i];
if (belowBounds.front == belowBounds.back && missingRange.count == 1) // <- Indicates the lower layer is an extrapolation (keep it that way)
{
depthSlice.depths[i] = belowBounds;
}
else // Lower bounds is a surface, encode an "above" bounds
{
depthSlice.depths[i] = new FrontBack {
back = belowBounds.back, front = (byte)System.Math.Min(byte.MaxValue, (int)belowBounds.back + 1)
}
};
}
}
return(depthSlice);
}
#endregion
}
