> The reason Apple does not have these kind of issues is that their Retina thing is more recent and thus there are no legacy apps that claim to be DPI aware
Not actually true. Many games are fairly messed up in either windowed, full-screen, or both noises. Usually it's because of a bad middleware toolkit that either enables the Retina backbuffer our not but the OpenGL scaling doesn't match the window scale. Especially prominent in games that use the older, Carbon method of exclusive full screen mode.
Aside: full screen games manage to be even worse on OS X than on Windows. That takes effort. (Games as full screen spaces is a really nice, usable concept, but the performance hit is so nasty nobody wants to support it instead of the invasive and messy Core Video tour.)
Not actually true. Many games are fairly messed up in either windowed, full-screen, or both noises. Usually it's because of a bad middleware toolkit that either enables the Retina backbuffer our not but the OpenGL scaling doesn't match the window scale. Especially prominent in games that use the older, Carbon method of exclusive full screen mode.
Aside: full screen games manage to be even worse on OS X than on Windows. That takes effort. (Games as full screen spaces is a really nice, usable concept, but the performance hit is so nasty nobody wants to support it instead of the invasive and messy Core Video tour.)