Function gvr_sys::gvr_buffer_viewport_set_source_layer

pub unsafe extern "C" fn gvr_buffer_viewport_set_source_layer(
    viewport: *mut gvr_buffer_viewport, 
    layer_index: i32
)

Sets the layer in a multiview buffer from which the viewport should sample.

@param layer_index The layer in the array texture that distortion samples from. Must be non-negative. Defaults to 0.