private unsafe byte ComputeMapBlend(Vector2 coords, int face, ref MapBlendCache cache, MyCubemapData<byte> map)
{
coords = coords * map.Resolution - .5f;
Vector2I isample = new Vector2I(coords);
if (cache.HashCode != m_hashCode || cache.Face != face || cache.Cell != isample)
{
byte tl, tr, bl, br;
cache.HashCode = m_hashCode;
cache.Cell = isample;
cache.Face = (byte)face;
// Biome
if (m_materialMap != null)
{
map.GetValue(isample.X, isample.Y, out tl);
map.GetValue(isample.X + 1, isample.Y, out tr);
map.GetValue(isample.X, isample.Y + 1, out bl);
map.GetValue(isample.X + 1, isample.Y + 1, out br);
byte* ss = stackalloc byte[4];
ss[0] = tl;
ss[1] = tr;
ss[2] = bl;
ss[3] = br;
if (tl == tr && bl == br && bl == tl)
{
fixed (ushort* smpls = cache.Data)
{
smpls[0] = (ushort)((tl << 8) | 0xF);
smpls[1] = 0;
smpls[2] = 0;
smpls[3] = 0;
}
}
else
{
fixed (ushort* smpls = cache.Data)
{
Sort4(ss);
ComputeTilePattern(tl, tr, bl, br, ss, smpls);
}
}
}
}
byte value;
fixed (ushort* smpls = cache.Data)
{
coords -= Vector2.Floor(coords);
if (coords.X == 1) coords.X = .99999f;
if (coords.Y == 1) coords.Y = .99999f;
SampleTile(smpls, ref coords, out value);
}
return value;
}
