Method writeMask

nes/ppu.go:257–266

$2001: PPUMASK

(value byte)

// $2001: PPUMASK
func (ppu *PPU) writeMask(value byte) {
	ppu.flagGrayscale = (value >> 0) & 1
	ppu.flagShowLeftBackground = (value >> 1) & 1
	ppu.flagShowLeftSprites = (value >> 2) & 1
	ppu.flagShowBackground = (value >> 3) & 1
	ppu.flagShowSprites = (value >> 4) & 1
	ppu.flagRedTint = (value >> 5) & 1
	ppu.flagGreenTint = (value >> 6) & 1
	ppu.flagBlueTint = (value >> 7) & 1
}

// $2002: PPUSTATUS
func (ppu *PPU) readStatus() byte {