Generated names do not initially correspond to an instance of an object. Objects
with generated names are created by binding a generated name to the context.
For example, a buffer object is created by calling the command BindBuffer with a
name returned by GenBuffers, which allocates resources for the buffer object and
its state, and associate the name with that object.
If an object is deleted while it is currently in use by a GL context, its name
is immediately marked as unused, and some......
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