pub const SCREEN_WIDTH: usize = 256;Expand description
Visible width of one rendered scanline in normal (non-hires) resolution, in pixels.
This is also the per-pixel-clock compositing width: one PPU pixel clock produces one
above/below layer-pixel pair regardless of resolution — only the DAC output stage doubles
for hi-res (docs/ppu.md §Hi-res (Modes 5/6) color-math precision).