Enum Lod 

pub enum Lod {
    Implicit,
    Bias(f32),
    Level(f32),
    Gradients([[f32; 2]; 2]),
    GradientsBias([[f32; 2]; 2], f32),
}

How a sample request picks its level of detail.

Variants

Implicit

The implicit level (sample), whose footprint a scalar evaluation leaves to the sampler.

Bias(f32)

The implicit level plus a bias the program states (sample_b, as given: the sampler clamps it to D3D’s -16..15.99).

Level(f32)

A level the program states (sample_l).

Gradients([[f32; 2]; 2])

The UV’s screen derivatives: those the program states (sample_d), or a quad’s own for an implicit-LOD sample (d/dx, then d/dy).

GradientsBias([[f32; 2]; 2], f32)

A quad’s own UV derivatives plus the bias the program states (sample_b in a quad).

Trait Implementations

impl Clone for Lod

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 Lod

impl Debug for Lod

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

Formats the value using the given formatter.

impl From<ImageLod> for Lod

fn from(lod: ImageLod) -> Self

A 2D sample’s level of detail as the image request states it (its gradients’ u and v).

impl From<Lod> for ImageLod

fn from(lod: Lod) -> Self

A 2D sample’s level of detail as an image request states it (its gradients’ third lane 0).

impl PartialEq for Lod

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Lod