Error pasted by logo4poop on Sun Oct 11 06:05:59 2020

Error: bad argument type - not a structure of the required type
u32vector

code pasted by logo4poop on Sun Oct 11 06:06:28 2020

(define VBO)
(u32vector-ref (glGenBuffers 1 VBO) 0)

Probably what you want added by Kooda on Sun Oct 11 10:46:57 2020

(define tmp (u32vector 0))
(glGenBuffers 1 tmp)
(define VBO (u32vector-ref tmp 0))

;; using the gl-utils egg:
(define VBO (gen-buffer))