updateVertices(at:_:)
Updates a vertex buffer synchronously on the CPU. The buffer is only valid for the lifetime of the callback.
Declaration
final func updateVertices<R, E>(at index: Int, _ body: @_lifetime(0: copy 0) (inout MutableRawSpan) throws(E) -> R) throws(E) -> R where E : Error, R : ~CopyableParameters
- index:
The vertex buffer index to update.
- body:
A closure that receives a mutable span over the buffer’s bytes for in-place modification.