Trait ExtShaderViewportIndexLayerExtension
vulkanalia::vk
pub trait ExtShaderViewportIndexLayerExtension: DeviceV1_0 { }
https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_EXT_shader_viewport_index_layer.html
impl ExtShaderViewportIndexLayerExtension for Device