setVertexAmplificationCount:viewMappings:

Declaration

- (void) setVertexAmplificationCount:(NSUInteger) count viewMappings:(const MTLVertexAmplificationViewMapping *) viewMappings;

Parameters

• count:

  The number of outputs to create. The maximum value is 2.

• viewMappings:

  Array of Mtlvertexamplificationviewmapping instances. Each instance 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.