void glBindTransformFeedback(GLenum target, GLuint id);
In the initial state, a default transform feedback object is bound and treated as a transform feedback object with a name of zero. If the name zero is subsequently bound, the default transform feedback object is again bound to the GL state.
While a transform feedback buffer object is bound, GL operations on the target to which it is bound affect the bound transform feedback object, and queries of the target to which a transform feedback object is bound return state from the bound object. When buffer objects are bound for transform feedback, they are attached to the currently bound transform feedback object. Buffer objects are used for trans- form feedback only if they are attached to the currently bound transform feedback object.
GL_INVALID_OPERATION is generated if the transform feedback operation is active on the currently bound transform feedback object, and that operation is not paused.
GL_INVALID_OPERATION is generated if id is not zero or the name of a transform feedback object returned from a previous call to glGenTransformFeedbacks(), or if such a name has been deleted by glDeleteTransformFeedbacks().
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