/// <summary>
/// Update the instancing vertex buffer
/// </summary>
private DynamicVertexBuffer UpdateInstanceVB(MeshInstanceGroup instanceGroup)
{
// Copy transform data to InstanceData structure
for (int i = 0; i < instanceGroup.totalVisible; i++)
{
instanceGroup.tempTransforms[i] = instanceGroup.visibleInstances[i].Transform;
}
// Update vertex buffer
if (instanceGroup.totalVisible > 0)
{
instanceGroup.instanceVB.SetData(instanceGroup.tempTransforms, 0,
instanceGroup.totalVisible, SetDataOptions.None);
}
return(instanceGroup.instanceVB);
}
/// <summary>
/// Resize mesh vertex buffer and/or get the bone matrices
/// </summary>
public void BuildMeshData(GraphicsDevice graphicsDevice, MeshInstanceGroup instanceGroup)
{
int totalInstances = instanceGroup.instances.Count;
#if XNA
graphicsDevice.SetVertexBuffers(null);
#elif MONOGAME
graphicsDevice.SetVertexBuffer(null);
#endif
/// Resize the vertex buffer for instances if needed
if (instanceGroup.instanceVB == null ||
totalInstances > instanceGroup.instanceVB.VertexCount)
{
instanceGroup.instanceVB = CreateInstanceVB(graphicsDevice, instanceGroup.instances);
}
else
{
UpdateInstanceVB(instanceGroup);
}
}