graphnode.h

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/*
 * Copyright (C) 2010-2011 David Robillard <d@drobilla.net>
 * Copyright (C) 2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2015-2022 Robin Gareus <robin@gareus.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <atomic>
#include <list>
#include <map>
#include <memory>
#include <set>
 
#include "pbd/rcu.h"
 
#include "ardour/libardour_visibility.h"
 
namespace ARDOUR
{
class Graph;
class GraphNode;
struct GraphChain;
 
typedef std::shared_ptr<GraphNode> node_ptr_t;
typedef std::set<node_ptr_t>         node_set_t;
typedef std::list<node_ptr_t>        node_list_t;
 
class LIBARDOUR_API ProcessNode
{
public:
        virtual ~ProcessNode() {}
        virtual void prep (GraphChain const*) = 0;
        virtual void run (GraphChain const*) = 0;
};
 
class LIBARDOUR_API GraphActivision
{
public:
        GraphActivision ();
        virtual ~GraphActivision () {}
 
        typedef std::map<GraphChain const*, node_set_t> ActivationMap;
        typedef std::map<GraphChain const*, int>        RefCntMap;
 
        node_set_t const& activation_set (GraphChain const* const g) const;
        int               init_refcount (GraphChain const* const g) const;
        void              flush_graph_activision_rcu ();
 
protected:
        friend struct GraphChain;
 
        SerializedRCUManager<ActivationMap> _activation_set;
        SerializedRCUManager<RefCntMap> _init_refcount;
};
 
class LIBARDOUR_API GraphNode : public ProcessNode, public GraphActivision
{
public:
        GraphNode (std::shared_ptr<Graph> Graph);
 
        /* API used by Graph */
        void prep (GraphChain const*);
        void run (GraphChain const*);
 
        /* API used to sort Nodes and create GraphChain */
        virtual std::string graph_node_name () const = 0;
 
        virtual bool direct_feeds_according_to_reality (std::shared_ptr<GraphNode>, bool* via_send_only = 0) = 0;
 
protected:
        void trigger ();
        virtual void process () = 0;
 
        std::shared_ptr<Graph> _graph;
 
private:
        void finish (GraphChain const*);
 
        std::atomic<int> _refcount;
};
 
} // namespace ARDOUR