fix for blockish speckle artifacts in anti-aliasing mode 3
fix for blockish speckle artifacts in anti-aliasing mode 3

UberPOV/UberPOV,UberPOV/UberPOV,UberPOV/UberPOV,UberPOV/UberPOV,UberPOV/UberPOV,UberPOV/UberPOV,UberPOV/UberPOV