Enum BandwidthClass 

pub enum BandwidthClass {
    Linear,
    Tiling,
    Compression,
}

What a modifier does to bus traffic.

Best-effort classification by vendor and bit inspection, used only for allocator scoring. Correctness never depends on this being right — the atomic TEST_ONLY commit is the arbiter of what a plane can scan out.

Deliberately not #[non_exhaustive]. It mirrors a closed C++ enum, and consumers switch on it to assign placement bonuses. Leaving it open would force every one of them to write a catch-all arm, which is exactly how a new class would silently inherit some other class’s bonus. Adding a variant should break those consumers so each decides what the new class is worth.

Variants

Linear

Raw bytes, poor DRAM locality.

Tiling

Same byte count, better locality: Broadcom UIF/SAND/T, Arm 16x16 interleaved, NVIDIA block-linear with compression type 0.

Compression

Fewer bytes on the bus, data-dependent: AFBC/AFRC, AMD DCC, Qualcomm UBWC, NVIDIA block-linear with a nonzero compression type.

Trait Implementations

impl Clone for BandwidthClass

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 BandwidthClass

impl Debug for BandwidthClass

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

Formats the value using the given formatter.

impl Eq for BandwidthClass

impl Hash for BandwidthClass

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 Ord for BandwidthClass

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for BandwidthClass

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for BandwidthClass

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for BandwidthClass