There are quite a few video game movies in the works, from Assassin's Creed to Mass Effect, and even Angry Birds. But if you were hoping for a movie adaptation of Half-Life or Left 4 Dead any time soon, don't hold your breath.
Valve has rebuffed Hollywood a few times for not understanding the passion behind the games and being able to translate that passion in the ideas presented, Valve chief Gabe Newell said in talking to on The Nerdist podcast (via Polygon). "There really were people who came to us with proposals of: ‘Okay, it's Half-Life 1, and there are horses, and it's a cavalry charge, and it's high-tech carbon armor on the horses,'" Newell added. "And we were like, ‘What the f*** are you talking about? Have you even played this?'"
Newell said Source Filmmaker was a response to these poor pitches, allowing gamers to be able to show their passion is their own movies. He also said that Valve is using the tool itself to create a 15-minute Team Fortress 2 project down the road.