Option to convert internal geometry into meshes

### The feature, motivation and pitch

In order to use alternative renderer it would be nice to have the option to convert internal geometry into meshes. Right now it looks like the geometry is created in the `render_context.c`. Like `makePlane` instead of generating opengl calls it would be great if there were an option to convert that into a mesh and then the alternative renderer just need to render the meshes and not "reimplement" the opengl calls into vulkan/metal or some other render api.

### Alternatives

_No response_

### Additional context

_No response_