Скачать или смотреть OpenGL for Dos (FreeDos) first tests..

Here's a two-file solution if you need OpenGL with Watcom C under DOS.
https://github.com/kosmonautdnb/WatcomGL. Simply include gl.h and link glimpl.cpp to your project.

If you need a code environment/text editor under DOS, check here:
https://github.com/kosmonautdnb/VCode

Have a good day!

(you may download https://rufus.ie to create a bootable usb stick with freedos on it. Watcom C 11 is also freely downloadable.)

This video was not rendered in real time; however, it would be just as fast at 320 x 200 pixels.
Note that a USB flash drive has a limited number of read/write cycles. Use real USB hard drives with FAT32 if possible. Or simply use a RAM disk when programming/compiling.