[Bug 212762] [11.0] [i915kms] OpenGL: DDS/DXT textures are rendered black, missing libtxn_dxtn-20140604 package

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212762

            Bug ID: 212762
           Summary: [11.0] [i915kms] OpenGL: DDS/DXT textures are rendered
                    black, missing libtxn_dxtn-20140604 package
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: afiskon at devzen.ru

Here is a simple OpenGL project that uses DXT textures:

https://github.com/afiskon/c-opengl-text/

README.md describes how to build it on FreeBSD, it's very simple.

Here is how it should look like:

http://eax.me/files/2016/02/opengl-text.jpg

Here is how it actually looks like now on FreeBSD:

http://afiskon.ru/s/fd/5938d906fa_opengl-regression.png

In other words all DXT textures are rendered black. I had this issue before a
few months ago and installing `libtxn_dxtn-20140604` package fixed it. The
problem is there is no such package or any similar package any longer.

Hardware:

* Fujitsu Lifebook E733
* Intel HD Graphics 4000

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