public void setUseRetinaFrameBuffer(boolean useRetinaFrameBuffer) {
        putBoolean("UseRetinaFrameBuffer", useRetinaFrameBuffer);
    }
Specifies whether to use full resolution framebuffers on Retina displays. This is ignored on other platforms.

@param useRetinaFrameBuffer whether to use full resolution framebuffers on Retina displays.
jme3-core/src/main/java/com/jme3/system/AppSettings.java