Enum ChannelEncoding 

pub enum ChannelEncoding {
    CompressedPosition,
    UncompressedPosition,
    PlanarPosition,
    CompressedUv,
    UncompressedUv,
    Color,
    CompressedNormal,
    Joints,
    Weights,
}

How one compressed channel is encoded as a vertex attribute.

Variants

CompressedPosition

An AABB-quantized position: Snorm16x4, decoded through MeshMetadata’s bounding box.

UncompressedPosition

A full-precision position: Float32x3.

PlanarPosition

A full-precision planar position: Float32x2. The missing third component reads as zero, which is what geometry that already lies in the target’s plane — a user interface’s, say — would store anyway.

CompressedUv

A range-remapped UV: Snorm16x2, decoded through MeshMetadata::uv_min_and_extents.

UncompressedUv

A full-precision UV: Float32x2.

Color

A vertex color, Unorm8x4, stored as it arrives.

CompressedNormal

A unit normal, octahedral-encoded into two snorm16 lanes.

A normal needs no decode parameters — the encoding is absolute, unlike the per-mesh ranges positions and UVs are quantized against — so a normal never makes its variant read the metadata array. The encoding is also the only one a stream offers: octahedral Snorm16x2 resolves a direction to well under a degree, which three full-precision lanes would not improve on for shading.

Joints

A joint index, Uint16x4. Indices address data structurally rather than interpolating, so they are never normalized.

Weights

A joint weight, Unorm16x4 in [0, 1].

Implementations

impl ChannelEncoding

pub const fn format(self) -> VertexFormat

The vertex format the channel is stored in.

pub const fn size(self) -> u32

Bytes the channel occupies, which is its attribute’s size.

Trait Implementations

impl Clone for ChannelEncoding

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 ChannelEncoding

impl Debug for ChannelEncoding

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

Formats the value using the given formatter.

impl Eq for ChannelEncoding

impl Hash for ChannelEncoding

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 ChannelEncoding

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ChannelEncoding