setVertexAmplificationCount(_:)
Sets the vertex amplification count and its view mapping for each amplification ID.
Declaration
func setVertexAmplificationCount(_ viewMappings: [MTLVertexAmplificationViewMapping])Parameters
- viewMappings:
A Swift array of Mtlvertexamplificationviewmapping elements. Each element in the array provides per-output offsets to a specific render target and viewport
Discussion
Each view mapping element describes how to route the corresponding amplification ID to a specific viewport and render target array index by using offsets from the base array index provided by the [[ render_target_array_index ]] and/or [[ viewport_array_index ]] output attributes in the vertex shader. This allows Metal to route each amplified vertex to a different [[ render_target_array_index ]] and [[ viewport_array_index ]], even though you can’t directly amplify these attributes.