Rendering some objects in openGL fails (CUBE)

[JohnCC330]

The attached package compiles well, but the towers, of which there should be one on each corner of the floor, do not render correctly (their height is 0). When changing the size of the window, the other tower appear randomly, probably due to rounding.

I tried this on a 64-bit host, with a 32-bit guest. There is no error message, just the rendering problem.

On the same host, with a 64-bit guest, I get a segmentation fault:

OpenGL Warning: XGetVisualInfo returned 0 visuals for 0x7bd6c0
OpenGL Warning: Retry with 0x8002 returned 0 visuals

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7bbb23e in fgOpenWindow ()
   from /usr/lib/x86_64-linux-gnu/libglut.so.3

Another test: I downloaded a simple demo which uses the older glBegin/glEnd type objects. Here the objects render correctly. So I suspect that the problem could be in the buffer-type interface to openGL.

[JohnCC330]

Package which exhibits the problem.