Struct LitVertexChannels 

pub struct LitVertexChannels {
    pub position: PositionStreamChannels,
    pub secondary: SecondaryFlags,
}

The per-vertex channels the built-in shader variant reads.

These are not part of LitOptions: they are a property of the geometry rather than of anything a caller picks, so a pipeline reads them off the vertex buffers its draws are recorded with — every draw of a mesh carries the channels that mesh’s buffers hold, so there is nothing to specialize on and nothing for a caller to get wrong. A family resolves them into LitVariant::channels.

The two halves are crate::mesh’s own channel types, so the attributes a pipeline declares and the bytes a packed mesh writes come from one description and cannot drift apart.

Fields

position: PositionStreamChannels

The position stream: whether it carries a position at all — and in which encoding — plus the joint pair that rides along with it.

A stream with no position leaves the geometry a single point at the instance origin, which is what point, particle and impostor draws want: the per-instance data alone places the vertex.

secondary: SecondaryFlags

The secondary stream’s channels: a UV in either encoding, a vertex color, a normal, or any combination.

Implementations

impl LitVertexChannels

pub const fn empty() -> Self

The channels of a layout that carries none: no position, no joints, and an empty secondary stream.

A variant built from this reads no per-vertex attribute at all — the geometry is a single point at the instance origin — which is what point, particle and impostor draws want. The instance record is unconditional, so a VertexInput struct always has members.

pub fn for_vertex_buffer(slot: u32, layout: &VertexBufferLayoutDesc) -> Self

The channels one vertex-buffer slot carries.

A channel is identified by its shader location, which is stable across variants. Only the built-in pipeline’s own slots are read — PRIMARY_SLOT and SECONDARY_SLOT — so any other slot, the per-instance one included, contributes nothing.

pub fn for_vertex_layout(layout: &[(u32, VertexBufferLayoutDesc)]) -> Self

The channels a whole vertex layout carries: the union of Self::for_vertex_buffer over layout’s slots.

Trait Implementations

impl Clone for LitVertexChannels

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for LitVertexChannels

impl Debug for LitVertexChannels

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for LitVertexChannels

impl Hash for LitVertexChannels

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for LitVertexChannels

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for LitVertexChannels