Struct OamShadow 

#[repr(align(256))]
pub struct OamShadow {
    pub entries: [OamEntry; 40],
    pub spare: [u8; 96],
}

A page of entries for OamDma to hand over.

The hardware takes only the high byte of the source address, so this is aligned to 256. Anywhere the linker puts a static is a legal source: work RAM runs 0xC000..0xE000 and read-only data sits below 0x8000, both inside the 0x0000..0xE000 the transfer can read.

Alignment rounds the size up from the 160 bytes of entries, and spare is the remainder. A transfer reads the entries only, so those bytes are free for whatever wants to travel with the objects: per-object velocities, animation counters, what a metasprite each belongs to.

Fields

entries: [OamEntry; 40]

What the transfer hands to the hardware.

spare: [u8; 96]

Room the alignment leaves over. The transfer does not read it.

Implementations

impl OamShadow

pub const fn new() -> Self

A page with every object hidden and the spare zeroed.

Trait Implementations

impl Default for OamShadow

fn default() -> Self

Returns the “default value” for a type.