GL_REGAL_log
https://github.com/p3/regal/tree/master/doc/extensions
GL_REGAL_log
	GL_LOG_ERROR_REGAL 0x9319
	GL_LOG_WARNING_REGAL 0x931A
	GL_LOG_INFO_REGAL 0x931B
	GL_LOG_APP_REGAL 0x931C
	GL_LOG_DRIVER_REGAL 0x931D
	GL_LOG_INTERNAL_REGAL 0x931E
	GL_LOG_DEBUG_REGAL 0x931F
	GL_LOG_STATUS_REGAL 0x9320
	GL_LOG_HTTP_REGAL 0x9321
	void glLogMessageCallbackREGAL (GLLOGPROCREGAL callback)
	typedef void (APIENTRY *GLLOGPROCREGAL)(GLenum stream, GLsizei length, const GLchar *message, GLvoid *context)