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Desktop resolution... Linux? Mac?

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Hello all, I am looking for the Linux and Mac OS X equivalents (or some other function) which will return the user's current desktop resolution, similar to the Windows GetSystemMetrics(SM_CnSCREEN); do such functions exist? (I've done some googling, however this has not proved fruitful. My application uses SDL for the media layer, however SDL does not have such a feature.)

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On MacOS X:

// CGDirectDisplay API (via ApplicationServices framework)
CGRect screenSize = CGDisplayBounds(kCGDirectMainDisplay); // kCGDirectMainDisplay provided for convenience
// screenSize.size.width/height to access dimensions

Or if you're using Cocoa:

[[NSScreen mainScreen] frame].size.width
[[NSScreen mainScreen] frame].size.height

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