03/15/2017 (Wed) 17:06:24
I think a big part of the problem is also that some games were made for a proprietary software environment with the latest advances and were then later licensed as free software. These are often big titles and attract well developed communities around them, so when they enter the libre gaming realm a high expectation is put on graphics driver developers to make it play. This advance can then become the standard for other open source projects.
An example of this can be the use of later opengl versions which many intel drivers don't support, which is contrary to the fact that intel chips have the best completely libre offering.