OpenGL programming, simple FPS style walking scene (DOS)

In this tool-assisted education video I create a simple FPS style walking and jumping scene for OpenGL, with DJGPP, in DOS. In a 256 colors 320x200 VGA mode. This is my first OpenGL exercise. Apologies about some little mistakes in the program (such as reloading the textures on every frame). I noticed them when this video was already late in production, and it would take several days before the new version would be available if I were to fix them, and I’m itching to get this video out and into making the n