[racket] Modern OpenGL support in racket

Hi.
>From racket docs i've found that sgl doesn't provide this opengl functionality:

Vertex arrays (GL 1.5, Section 2.8)
Buffer objects (GL 1.5, Section 2.9)
glGetPointerv (GL 1.5, Section 6.1.11)
Buffer object queries (GL 1.5, Section 6.1.13)
Polygon tessellation (GLU 1.3, Section 5)

Are there specific reasons this stuff is not implemented? (Perhaps
some subtle implementation hardships)

Or it's not implemented because there was no need in this stuff so far?




-- 
With best regards,
Dmitry