Enum ImageLod 

pub enum ImageLod {
    Implicit,
    Bias(f32),
    Level(f32),
    Gradients([[f32; 3]; 2]),
    GradientsBias([[f32; 3]; 2], f32),
}

How a request picks its level of detail. Gradients are three components wide: a 1D or 2D texture leaves the rest 0.

Variants

Implicit

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

Bias(f32)

The implicit level plus a bias the program states.

Level(f32)

A level the program states.

Gradients([[f32; 3]; 2])

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

GradientsBias([[f32; 3]; 2], f32)

A quad’s own derivatives plus the bias the program states.

Trait Implementations

impl Clone for ImageLod

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 ImageLod

impl Debug for ImageLod

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 ImageLod

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ImageLod