/// <summary>
/// Gets a static instance of SurfaceGeometry.
/// </summary>
public static SurfaceGeometry GetInstance(GraphicsDevice graphics, int patchSegmentCount, SurfaceTopology topology)
{
SurfaceGeometry result = null;
WeakReference <SurfaceGeometry> value;
if (resourceDictionary.TryGetValue(new SurfaceGeometryKey(graphics, patchSegmentCount, topology), out value))
{
if (value.TryGetTarget(out result))
{
return(result);
}
resourceDictionary.Remove(new SurfaceGeometryKey(graphics, patchSegmentCount, topology));
}
result = new SurfaceGeometry(graphics, patchSegmentCount, topology);
value = new WeakReference <SurfaceGeometry>(result);
resourceDictionary.Add(new SurfaceGeometryKey(graphics, patchSegmentCount, topology), value);
return(result);
}
/// <summary>
/// This method is called either when the surface is batch initialized using ISupportInitialize interface
/// or when a property has modified that needs the surface to be re-initialized.
/// </summary>
private void OnInitialized()
{
var removedPatches = patches;
if (heightmap == null)
{
localBounds = new BoundingBox();
patchCountX = patchCountZ = 0;
segmentCountX = segmentCountZ = 0;
patches = null;
if (removed != null && removedPatches != null)
{
foreach (var patch in removedPatches)
{
removed(patch);
}
}
return;
}
if (patchSegmentCount < 2 || patchSegmentCount % 2 != 0 ||
heightmap.Width % patchSegmentCount != 0 ||
heightmap.Height % patchSegmentCount != 0)
{
throw new ArgumentOutOfRangeException(
"patchSegmentCount must be a even number, " +
"segmentCountX/segmentCountY must be a multiple of patchSegmentCount.");
}
// Create patches
var newPatchCountX = heightmap.Width / patchSegmentCount;
var newPatchCountZ = heightmap.Height / patchSegmentCount;
// Invalid patches when patch count has changed
if (newPatchCountX != patchCountX || newPatchCountZ != patchCountZ)
{
patches = null;
if (removed != null && removedPatches != null)
{
foreach (var patch in removedPatches)
{
removed(patch);
}
}
}
patchCountX = newPatchCountX;
patchCountZ = newPatchCountZ;
// Store these values in case they change
segmentCountX = heightmap.Width;
segmentCountZ = heightmap.Height;
step = heightmap.Step;
size = new Vector3(heightmap.Width * step, 0, heightmap.Height * step);
// Initialize geometry
Geometry = SurfaceGeometry.GetInstance(GraphicsDevice, patchSegmentCount, topology);
if (lodEnabled)
{
Geometry.EnableLevelOfDetail();
}
// Convert vertex type
if (vertexType == null || vertexType == typeof(VertexPositionNormalTexture))
{
ConvertVertexType <VertexPositionNormalTexture>(PopulateVertex);
}
else if (vertexType == typeof(VertexPositionColor))
{
ConvertVertexType <VertexPositionColor>(PopulateVertex);
}
else if (vertexType == typeof(VertexPositionTexture))
{
ConvertVertexType <VertexPositionTexture>(PopulateVertex);
}
else if (vertexType == typeof(VertexPositionNormal))
{
ConvertVertexType <VertexPositionNormal>(PopulateVertex);
}
else if (vertexType == typeof(VertexPositionNormalDualTexture))
{
ConvertVertexType <VertexPositionNormalDualTexture>(PopulateVertex);
}
else if (vertexType == typeof(VertexPositionNormalTangentBinormalTexture))
{
ConvertVertexType <VertexPositionNormalTangentBinormalTexture>(PopulateVertex);
}
else if (vertexType == typeof(VertexPositionColorNormalTexture))
{
ConvertVertexType <VertexPositionColorNormalTexture>(PopulateVertex);
}
else
{
throw new NotSupportedException("Vertex type not supported. Try using Surface.ConvertVertexType<T> instead.");
}
}
