Struct NullVideoBus 

pub struct NullVideoBus;

A no-op VideoBus for unit-testing the PPU in isolation (the one-directional graph is what makes per-chip testing possible).

Trait Implementations

impl Debug for NullVideoBus

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

Formats the value using the given formatter.

impl Default for NullVideoBus

fn default() -> NullVideoBus

Returns the “default value” for a type.

impl VideoBus for NullVideoBus

fn cart_read(&mut self, _addr24: u32) -> u8

Cartridge-mediated read for the PPU (Mode 7 extended-bank fetches on coprocessor boards route here; plain boards return open bus). Default 0.

fn notify_scanline(&mut self)

Notify the board that the PPU is starting a new scanline (for scanline-aligned coprocessor / IRQ logic). Default no-op.

fn notify_vblank(&mut self)

Notify the board that the PPU has entered vertical blank. Default no-op.