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#ifndef VPYTHON_UTIL_GL_FREE_HPP
#define VPYTHON_UTIL_GL_FREE_HPP
#include <boost/signals.hpp>
#include "thread.hpp"
namespace cvisual {
class gl_free_manager {
public:
// The callback will be called if the OpenGL context(s) are destroyed
template <class T>
void connect( T callback ) { on_shutdown().connect( callback ); }
// The callback will be called the next time OpenGL objects may be freed, and
// will no longer be called on shutdown().
template <class T>
void free( T callback ) { on_next_frame().connect( callback ); on_shutdown().disconnect( callback ); }
// Call with OpenGL context active
void frame();
// Call when the context(s) are destroyed. The gl_free_manager can be reused.
void shutdown();
private:
boost::signal< void() > &on_shutdown();
boost::signal< void() > &on_next_frame();
};
// At present, there is just one of these, because all OpenGL contexts share server
// objects through wglShareLists or equivalent. It is shutdown when all contexts are
// shut down. If this design is changed in the
// future, there will need to be an instance for each context.
extern gl_free_manager on_gl_free;
} // !namespace cvisual
#endif // !defined VPYTHON_UTIL_GL_FREE_HPP
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