Emulator graphics are blurry, even when running at the native resolution of your display.
RetroArch has hardware bilinear filtering enabled.
From a booted RetroPie:
- Select RetroPie in the game system selector menu.
- Select RetroArch
- Select Settings
- Select Video
- Set HW Bilinear Filtering to “OFF“
- Go back to the main RetroArch menu.
- Select Configuration
- Set Save Configuration on Exit to “OFF“
- Select Quit RetroArch