GLUconsumerFriend Class Reference

Inheritance diagram for GLUconsumerFriend:

List of all members.

Friends
void	sphere_revolve_cb (void *data, const GLUvec4 *position, const GLUvec4 *normal, const GLUvec4 *tangent, const GLUvec4 *uv)
void	sphere_begin_cb (void *data, GLenum mode)
void	sphere_index_cb (void *data, unsigned index)
void	sphere_end_cb (void *data)

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Detailed Description

GLUsphereProducer decorator to implement call-backs

To generate the sphere data, the GLUsphereProducer class interfaces with various C functions that use a call-back mechanism. These call-backs are analogous the emit_vertex, emit_begin, emit_index, and emit_end methods that GLUsphereProducer subclasses will provide.

However, these methods are all protected. As a result the non-class call-back functions cannot call these methods unless they are friend functions. It is undesireable to expose the implementation detail in the application-facing header file. This can be worked around by creating a dummy subclass of GLUsphereProducer that only contains the friend function declarations. Pointers to GLUsphereProducer objects can be cast to pointers to GLUsphereFriend objects without side-effect.

This is arguably a mis-use of the "decorator" pattern, but it is the most efficient way to do this.

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The documentation for this class was generated from the following file:

• src/sphere.cpp