native res factor when fbemu disabled

[ghost]

would it be possible to add support for a native resolution factor scale when framebuffer emulation is disabled? currently native res factors are only supported when fbemu is enabled, i wonder could similar logic be used when fbemu is disabled

[gonetz]

Calculation of color buffer size (that is the native resolution) is a part of framebuffer emulation. The plugin can't use native resolution factor scale without knowing that size.