pixelated bitmap grunge gradient texture. black dither pattern wallpaper. abstract glitchy pattern. 8 bit video game

game background halftone dither bit gradient 8 pattern bitmap arcade vector art retro texture dot effect geometric square shape graphic gradation mosaic abstract fade horizontal white computer play wallpaper speckle grid spread vintage old dithering screentone digital halfton bw overlay comic semitone duotone bg video pixel noise grunge circle