Not sure if OpenSCAD is what you're looking for. From their about page:
OpenSCAD is software for creating solid 3D CAD models. It is free software and available for Linux/UNIX, Windows and Mac OS X. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the ...
Although the documentation has disappeared, it's still possible to develop and run code that does OpenGL/OpenCL. In fact, I'm writing OpenGL on a Mac as we speak. If performance isn't an issue, run a Linux variant in a VM. Performance in Parallels tracks pretty closely to running on the host OS.
Well, it does not look as if this question were to be answered properly any soon, so I will just leave here my best effort to answer it.
As far as I have seen, I have two promising possibilities for 3D/OpenGL and multimedia support that are cross-platform (including mobile) and full-featured:
Since my needs are rather low-level, I think I ...