“We looked at a variety of methods to get our games onto the Mac and in the end decided to go with native versions rather than emulation,” said John Cook, Director of Steam Development. “The inclusion of WebKit into Steam, and of OpenGL into Source gives us a lot of flexibility in how we move these technologies forward. We are treating the Mac as a tier-1 platform so all of our future games will release simultaneously on Windows, Mac, and the Xbox 360.
Valve to Deliver Steam & Steam on the Mac
Thanks to John Gruber of Daring Fireball for the link to the Wired story that includes a great quote from Dan Connors of Telltale Games:
“We have games that run on the Mac and we have games that run on Steam, so our goal is to be there,” Connors said. “We think they’re going to do a great job with getting the Steam client over there and we want to continue to be a part of it.”
I imagine a lot of other game developers are going to be saying the same thing.

![Based on the teaser images, it seems likely that all of these titles will also make their way to the Mac. This leads us to believe that Valve has ported their Source game engine over to the Mac, which would allow any future games based on this engine to be easily launched for the Mac. Alternative [sic], Valve could be using Transgaming/Cider for the translation.
The Significance of Steam and Valve’s Games for Mac - Mac Rumors
This is a big deal for gaming on the Mac. If Valve has indeed ported or rewritten their Source game engine for the Mac, it’s an even bigger deal. Not only would Mac users have access to a great game distribution platform, but game developers would also have access to a game engine that could easily target Windows, Xbox 360, PlayStation 3 and OS X. It would make the case for developing Source-based games for the Mac a no-duh proposition.
Plus, I don’t see how Valve could justify this hype if all they’re doing is using Cider to act as a graphics translation layer. That’s nothing new, and anyway, who would want to base an entire business venture on another company’s inelegant graphics translation product? I hope Valve sees it the same way.
Update 3/8/2010: They do.](http://30.media.tumblr.com/tumblr_kyru6lrq1y1qzxralo1_500.jpg)