/// <summary>
/// Removes a display object from the batch.
/// </summary>
/// <param name="displayObject">Display object to remove.</param>
/// <param name="drawer">Instanced model drawer doing the removal.</param>
public unsafe void Remove(ModelDisplayObject displayObject, InstancedModelDrawer drawer)
{
//Copy the end of the list over the top of the part back (after the display object)
var vertexCopySource = displayObject.BatchInformation.BaseVertexBufferIndex + displayObject.BatchInformation.VertexCount;
var vertexCopyTarget = displayObject.BatchInformation.BaseVertexBufferIndex;
var vertexCopyLength = vertexCount - vertexCopySource;
Array.Copy(vertices, vertexCopySource, vertices, vertexCopyTarget, vertexCopyLength);
Array.Copy(instancedVertices, vertexCopySource, instancedVertices, vertexCopyTarget, vertexCopyLength);
vertexCount -= displayObject.BatchInformation.VertexCount;
//Copy the first part back (before the display object)
var indexCopySource = displayObject.BatchInformation.BaseIndexBufferIndex + displayObject.BatchInformation.IndexCount;
var indexCopyTarget = displayObject.BatchInformation.BaseIndexBufferIndex;
var indexCopyLength = indexCount - indexCopySource;
Array.Copy(indices, indexCopySource, indices, indexCopyTarget, indexCopyLength);
indexCount -= displayObject.BatchInformation.IndexCount;
//The index buffer's data is now wrong. We deleted a bunch of vertices.
//So go through the index buffer starting at the point of deletion and decrease the values appropriately.
for (int i = displayObject.BatchInformation.BaseIndexBufferIndex; i < indexCount; i++)
{
indices[i] -= (ushort)displayObject.BatchInformation.VertexCount;
}
//Like with the index buffer, go through the buffer starting at the point of deletion and decrease the instance index values.
for (int i = displayObject.BatchInformation.BaseVertexBufferIndex; i < vertexCount; i++)
{
instancedVertices[i].InstanceIndex--;
}
displayObjects.Remove(displayObject);
//Move the subsequent display objects list indices and base vertices/indices.
for (int i = displayObject.BatchInformation.BatchListIndex; i < DisplayObjects.Count; i++)
{
DisplayObjects[i].BatchInformation.BatchListIndex--;
DisplayObjects[i].BatchInformation.BaseVertexBufferIndex -= displayObject.BatchInformation.VertexCount;
DisplayObjects[i].BatchInformation.BaseIndexBufferIndex -= displayObject.BatchInformation.IndexCount;
}
// Tell ModelDisplayObject that it got removed (batch, indices).
var batchListIndex = displayObject.BatchInformation.BatchListIndex;
displayObject.ClearBatchReferences();
if (displayObjects.Count > 0 && batchListIndex < displayObjects.Count)
{
vertexBuffer.SetData(sizeof(VertexPositionNormalTexture) * vertexCopyTarget, vertices, vertexCopyTarget, vertexCopyLength, sizeof(VertexPositionNormalTexture));
instancedBuffer.SetData(sizeof(InstancedVertex) * vertexCopyTarget, instancedVertices, vertexCopyTarget, vertexCopyLength, sizeof(InstancedVertex));
indexBuffer.SetData(sizeof(ushort) * indexCopyTarget, indices, indexCopyTarget, indexCopyLength);
}
}
/// <summary>
/// Adds a display object to the batch.
/// </summary>
/// <param name="displayObject">Display object to add.</param>
/// <param name="drawer">Drawer of the batch.</param>
public unsafe bool Add(ModelDisplayObject displayObject, InstancedModelDrawer drawer)
{
//In theory, don't need to test for duplicate entries since batch.Add
//should only be called through a InstancedModelDrawer's add (which checks beforehand).
if (displayObjects.Count == MaximumObjectsPerBatch ||
((indexCount / 3 + displayObject.GetTriangleCountEstimate()) > MaximumPrimitiveCountPerBatch &&
displayObjects.Count > 0))
{
return(false);
}
displayObjects.Add(displayObject);
int instanceIndex = displayObjects.Count - 1;
var textureIndex = displayObject.TextureIndex;
//OUegheogh, this could just directly write into the batch's vertex/index cache rather than going through a list and recopy.
displayObject.GetVertexData(vertexList, indexList, this, (ushort)vertexCount, indexCount, instanceIndex);
vertexList.CopyTo(vertices, vertexCount);
indexList.CopyTo(indices, indexCount);
var newIndexCount = indexCount + indexList.Count;
var newVertexCount = vertexCount + vertexList.Count;
for (int i = vertexCount; i < newVertexCount; i++)
{
instancedVertices[i] = new InstancedVertex {
InstanceIndex = instanceIndex, TextureIndex = textureIndex
}
}
;
vertexBuffer.SetData(sizeof(VertexPositionNormalTexture) * vertexCount, vertices, vertexCount, vertexList.Count, sizeof(VertexPositionNormalTexture));
instancedBuffer.SetData(sizeof(InstancedVertex) * vertexCount, instancedVertices, vertexCount, vertexList.Count, sizeof(InstancedVertex));
indexBuffer.SetData(sizeof(ushort) * indexCount, indices, indexCount, indexList.Count);
vertexCount = newVertexCount;
indexCount = newIndexCount;
vertexList.Clear();
indexList.Clear();
return(true);
}
