问题
I have been playing around with SDL 2.0 but after searching I haven't found anything online about how to support retina macs. When creating a window using the following code.
gWindow = SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED, 500, 500, SDL_WINDOW_SHOWN);
It creates a window that has an actual size of 1000 * 1000. This isn't really an issue because it's how apps are supposed to work using a hidpi screen. However, when loading images I can't seem to find a way to load images that are 2x as big for retina screens and my images always look blurry.
回答1:
Current versions of SDL2 have support for retina.
To create a retina window, pass a flag SDL_WINDOW_ALLOW_HIGHDPI into SDL_CreateWindow().
After a resize event, you can check the actual buffer resolution with the API call SDL_GL_GetDrawableSize().
回答2:
Right now, SDL doesn't support retina displays on Macs (or High-DPI displays on Windows machines).
There is discussion about how best to add these features, and a few prototype patches on SDL's bug tracker, here: https://bugzilla.libsdl.org/show_bug.cgi?id=1934
Presumably we'll see official retina support in a future release of SDL2. Or if you're willing to compile your own SDL libraries, those patches work for me.
来源：https://stackoverflow.com/questions/18544881/sdl-2-0-retina-mac