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I Tried Gaming on Linux...
(youtu.be)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
The issue is one of licensing, not technology. There's all kinds of patents in the space, and using free codecs could still infringe them. DirectX doesn't have the same patent protection. I believe in theory you could make a fully open source Linux native version of DirectX.
For more info from someone who knows more than me, see here.