[SDL] [OT] Minimum resolution

[Ryan C. Gordon]

> Additionally, those rules do not apply to text (as text, even on 640x480) can 
> get very small and still be readable, and they do not apply to simple UI 
> widgets (such as window controls, or scroll bars, or radio buttons or 
> checkboxes, or mouse cursors, or anything like that) because they can get 
> extremely small and still be totally useful

I've found text doesn't scale UP well. You might find it best to use 
something like FreeType to render the text as a series of polygons so 
they look crisp at any resolution...if you do them as textured quads, 
they start looking bad very quickly (try Quake 3 at 1920x1200 and look 
at the text at the start of a round, for example).

--ryan.