Enum Mirroring 

pub enum Mirroring {
    Horizontal,
    Vertical,
    SingleScreenA,
    SingleScreenB,
    FourScreen,
    MapperControlled,
}

Nametable mirroring layout selected by the cartridge wiring.

Per docs/mappers.md §Mirroring, this is initial mirroring for any non-trivial mapper; mappers that expose runtime mirroring control will override this from their internal state.

Variants

Horizontal

Horizontal arrangement (vertical mirroring on the address line).

Vertical

Vertical arrangement (horizontal mirroring on the address line).

SingleScreenA

Both nametables fetch from physical bank A.

SingleScreenB

Both nametables fetch from physical bank B.

FourScreen

Four-screen mode: cartridge supplies extra 2 KiB VRAM.

MapperControlled

Mapper supplies a runtime mirroring table; defer to the mapper.

Implementations

impl Mirroring

pub const fn physical_bank(self, logical_table: u8) -> usize

Resolve a logical nametable index (0..=3, in $2000 / $2400 / $2800 / $2C00 order) to a 2 KiB-VRAM physical bank index (0 or 1) under this mirroring mode. Used by every mapper’s nametable_offset helper to keep the mirroring table in one place.

Trait Implementations

impl Clone for Mirroring

fn clone(&self) -> Mirroring

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Mirroring

impl Debug for Mirroring

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

Formats the value using the given formatter.

impl Eq for Mirroring

impl Hash for Mirroring

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 Mirroring

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Mirroring