Having trouble porting basic GLFW C++ example to D

[Matt Jones via Digitalmars-d-learn]

I've been trying to port a basic GLFW C++ example to D. The C++ 
version shows the textures correctly. But the D version shows 
nothing. The code is almost identical. Does anyone know why the D 
version does not work?

https://github.com/workhorsy/d_glfw