John Carmack has left id Software, the company he co-founded in 1991.

Carmack served as technical director at id Software, which developed popular game franchises such as Wolfenstein 3D, Doom and Quake, before he resigned on Friday. He will now pour all of his energy into his full-time gig as chief technical officer at Ocular VR, the company working on a head-mounted virtual reality display called Oculus Rift.

Tim Willits, studio director at id Software, issued the following statement on Carmack's departure:"John Carmack, who has become interested in focusing on things other than game development at id, has resigned from the studio. As colleagues of John for many years, we wish him well."

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Oculus VR announced earlier this year that Carmack would become CTO, but Carmack said he would continue his work at id Software as a Quake and Doom developer. His recent departure from id Software marks the second big loss for the company in 2013, as Todd Hollenshead, president and former CEO, also left in the summer after a 17-year tenure.

"I wanted to remain a technical adviser for Id, but it just didn't work out," tweeted Carmack on Twitter. "Probably for the best, as the divided focus was challenging."

In his statement, Willits confirmed that Carmack's resignation would not affect any current projects at the company, which means development should continue without further interruption on Doom 4, the upcoming multi-platform instalment of the Doom series.