Work towards engine/GUI separation.

git-svn-id: http://svn.drobilla.net/lad/trunk/machina@5495 a436a847-0d15-0410-975c-d299462d15a1

13 files changed, 207 insertions, 124 deletions

diff --git a/src/client/ClientModel.cpp b/src/client/ClientModel.cpp
index 17054d4..3a8770f 100644
--- a/src/client/ClientModel.cpp
+++ b/src/client/ClientModel.cpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -31,13 +31,31 @@ ClientModel::find(uint64_t id)
 	}
 }
 
+SPtr<const ClientObject>
+ClientModel::find(uint64_t id) const
+{
+	SPtr<ClientObject> key(new ClientObjectKey(id));
+	Objects::const_iterator  i = _objects.find(key);
+	if (i != _objects.end()) {
+		return *i;
+	} else {
+		return SPtr<ClientObject>();
+	}
+}
+
 void
-ClientModel::new_object(SPtr<ClientObject> object)
+ClientModel::new_object(uint64_t id, const Properties& properties)
 {
-	Objects::iterator i = _objects.find(object);
+	SPtr<ClientObject> key(new ClientObjectKey(id));
+	Objects::iterator i = _objects.find(key);
 	if (i == _objects.end()) {
+		SPtr<ClientObject> object(new ClientObject(id, properties));
 		_objects.insert(object);
 		signal_new_object.emit(object);
+	} else {
+		for (const auto& p : properties) {
+			(*i)->set(p.first, p.second);
+		}
 	}
 }
 
@@ -56,7 +74,7 @@ ClientModel::erase_object(uint64_t id)
 }
 
 void
-ClientModel::property(uint64_t id, URIInt key, const Atom& value)
+ClientModel::set(uint64_t id, URIInt key, const Atom& value)
 {
 	SPtr<ClientObject> object = find(id);
 	if (object) {
@@ -64,5 +82,13 @@ ClientModel::property(uint64_t id, URIInt key, const Atom& value)
 	}
 }
 
+const Atom&
+ClientModel::get(uint64_t id, URIInt key) const
+{
+	static const Atom null_atom;
+	SPtr<const ClientObject> object = find(id);
+	return object ? object->get(key) : null_atom;
+}
+
 }
 }
diff --git a/src/client/ClientModel.hpp b/src/client/ClientModel.hpp
index 6840c11..e65fb93 100644
--- a/src/client/ClientModel.hpp
+++ b/src/client/ClientModel.hpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -21,6 +21,8 @@
 
 #include <sigc++/sigc++.h>
 
+#include "machina/Model.hpp"
+
 #include "ClientObject.hpp"
 
 namespace Raul {
@@ -30,14 +32,18 @@ class Atom;
 namespace machina {
 namespace client {
 
-class ClientModel
+class ClientModel : public Model
 {
 public:
-	void new_object(SPtr<ClientObject> object);
+	void new_object(uint64_t id, const Properties& properties);
+
 	void erase_object(uint64_t id);
-	void property(uint64_t id, URIInt key, const Atom& value);
 
-	SPtr<ClientObject> find(uint64_t id);
+	SPtr<ClientObject>       find(uint64_t id);
+	SPtr<const ClientObject> find(uint64_t id) const;
+
+	void        set(uint64_t id, URIInt key, const Atom& value);
+	const Atom& get(uint64_t id, URIInt key) const;
 
 	sigc::signal< void, SPtr<ClientObject> > signal_new_object;
 	sigc::signal< void, SPtr<ClientObject> > signal_erase_object;
diff --git a/src/client/ClientObject.cpp b/src/client/ClientObject.cpp
index 9481d10..20b50a2 100644
--- a/src/client/ClientObject.cpp
+++ b/src/client/ClientObject.cpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -21,9 +21,10 @@
 namespace machina {
 namespace client {
 
-ClientObject::ClientObject(uint64_t id)
+ClientObject::ClientObject(uint64_t id, const Properties& properties)
 	: _id(id)
 	, _view(NULL)
+	, _properties(properties)
 {}
 
 ClientObject::ClientObject(const ClientObject& copy, uint64_t id)
diff --git a/src/client/ClientObject.hpp b/src/client/ClientObject.hpp
index cf00a2b..6520b11 100644
--- a/src/client/ClientObject.hpp
+++ b/src/client/ClientObject.hpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -30,7 +30,7 @@ namespace client {
 class ClientObject
 {
 public:
-	explicit ClientObject(uint64_t id);
+	explicit ClientObject(uint64_t id, const Properties& properties={});
 	ClientObject(const ClientObject& copy, uint64_t id);
 
 	inline uint64_t id() const { return _id; }
diff --git a/src/engine/Controller.cpp b/src/engine/Controller.cpp
index 8c27503..8f9e1a2 100644
--- a/src/engine/Controller.cpp
+++ b/src/engine/Controller.cpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -14,12 +14,9 @@
   along with Machina.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "client/ClientModel.hpp"
-#include "client/ClientObject.hpp"
 #include "machina/Controller.hpp"
 #include "machina/Engine.hpp"
 #include "machina/Machine.hpp"
-#include "machina/Machine.hpp"
 #include "machina/Updates.hpp"
 
 #include "Edge.hpp"
@@ -27,26 +24,32 @@
 
 namespace machina {
 
-Controller::Controller(SPtr<Engine>         engine,
-                       client::ClientModel& client_model)
+Controller::Controller(SPtr<Engine> engine,
+                       Model&       model)
 	: _engine(engine)
-	, _client_model(client_model)
+	, _model(model)
 	, _updates(new Raul::RingBuffer(4096))
 {
 	_engine->driver()->set_update_sink(_updates);
 }
 
 uint64_t
-Controller::create(const client::ClientObject& properties)
+Controller::create(const Properties& properties)
 {
-	TimeDuration dur(
-		_engine->machine()->time().unit(),
-		properties.get(URIs::instance().machina_duration).get<float>());
+	std::map<URIInt, Atom>::const_iterator d = properties.find(
+		URIs::instance().machina_duration);
+
+	double duration = 0.0;
+	if (d != properties.end()) {
+		duration = d->second.get<float>();
+	} else {
+		std::cerr << "warning: new object has no duration" << std::endl;
+	}
+
+	TimeDuration dur(_engine->machine()->time().unit(), duration);
 	SPtr<Node> node(new Node(dur));
-	SPtr<client::ClientObject> obj(
-		new client::ClientObject(properties, node->id()));
 	_objects.insert(node);
-	_client_model.new_object(obj);
+	_model.new_object(node->id(), properties);
 	_engine->machine()->add_node(node);
 	return node->id();
 }
@@ -54,59 +57,55 @@ Controller::create(const client::ClientObject& properties)
 void
 Controller::announce(SPtr<Machine> machine)
 {
+	if (!machine) {
+		return;
+	}
+
 	Forge& forge = _engine->forge();
 
+	// Announce nodes
 	for (const auto& n : machine->nodes()) {
-		// Find or create a new client object if necessary
-		SPtr<client::ClientObject> obj = _client_model.find(n->id());
-		if (!obj) {
-			obj = SPtr<client::ClientObject>(new client::ClientObject(n->id()));
-			obj->set(URIs::instance().rdf_type,
-			         forge.make_urid(URIs::instance().machina_Node));
-			obj->set(URIs::instance().machina_duration,
-			         forge.make(float(n->duration().to_double())));
-			if (n->is_initial()) {
-				obj->set(URIs::instance().machina_initial, forge.make(true));
-			}
-
-			SPtr<MidiAction> midi_action = dynamic_ptr_cast<MidiAction>(
-				n->enter_action());
-			if (midi_action) {
-				SPtr<client::ClientObject> action = _client_model.find(
-					midi_action->id());
-				if (!action) {
-					action = SPtr<client::ClientObject>(
-						new client::ClientObject(midi_action->id()));
-					action->set(URIs::instance().machina_note_number,
-					            forge.make((int32_t)midi_action->event()[1]));
-					_client_model.new_object(action);
-				}
-				obj->set(URIs::instance().machina_enter_action,
-				         forge.make(int32_t(n->enter_action()->id())));
-			}
+		Properties properties {
+			{ URIs::instance().rdf_type,
+			  forge.make_urid(URIs::instance().machina_Node) },
+			{ URIs::instance().machina_duration,
+			  forge.make(float(n->duration().to_double())) } };
+		if (n->is_initial()) {
+			properties.insert({ URIs::instance().machina_initial,
+			                    forge.make(true) });
 		}
+
+		SPtr<MidiAction> midi_action = dynamic_ptr_cast<MidiAction>(
+			n->enter_action());
+		if (midi_action) {
+			Properties action_properties {
+				{ URIs::instance().machina_note_number,
+				  forge.make((int32_t)midi_action->event()[1]) } };
+
+			_model.new_object(midi_action->id(), action_properties);
+			properties.insert({ URIs::instance().machina_enter_action,
+			                    forge.make(int32_t(n->enter_action()->id())) });
+		}
+
 		_objects.insert(n);
-		_client_model.new_object(obj);
+		_model.new_object(n->id(), properties);
 	}
 
+	// Announce edges
 	for (const auto& n : machine->nodes()) {
 		for (const auto& e : n->edges()) {
-			SPtr<client::ClientObject> eobj = _client_model.find(e->id());
-			if (!eobj) {
-				eobj = SPtr<client::ClientObject>(
-					new client::ClientObject(e->id()));
-				eobj->set(URIs::instance().rdf_type,
-				          forge.make_urid(URIs::instance().machina_Edge));
-				eobj->set(URIs::instance().machina_probability,
-				          forge.make(e->probability()));
-				eobj->set(URIs::instance().machina_tail_id,
-				          forge.make((int32_t)n->id()));
-				eobj->set(URIs::instance().machina_head_id,
-				          forge.make((int32_t)e->head()->id()));
-			}
+			const Properties properties {
+				{ URIs::instance().rdf_type,
+				  forge.make_urid(URIs::instance().machina_Edge) },
+				{ URIs::instance().machina_probability,
+				  forge.make(e->probability()) },
+				{ URIs::instance().machina_tail_id,
+				  forge.make((int32_t)n->id()) },
+				{ URIs::instance().machina_head_id,
+				  forge.make((int32_t)e->head()->id()) } };
 
 			_objects.insert(e);
-			_client_model.new_object(eobj);
+			_model.new_object(e->id(), properties);
 		}
 	}
 }
@@ -142,7 +141,7 @@ Controller::set_property(uint64_t    object_id,
 	SPtr<Stateful> object = find(object_id);
 	if (object) {
 		object->set(key, value);
-		_client_model.property(object_id, key, value);
+		_model.set(object_id, key, value);
 	}
 }
 
@@ -152,20 +151,30 @@ Controller::connect(uint64_t tail_id, uint64_t head_id)
 	SPtr<Node> tail = dynamic_ptr_cast<Node>(find(tail_id));
 	SPtr<Node> head = dynamic_ptr_cast<Node>(find(head_id));
 
+	if (!tail) {
+		std::cerr << "error: tail node " << tail_id << " not found" << std::endl;
+		return 0;
+	} else if (!head) {
+		std::cerr << "error: head node " << head_id << " not found" << std::endl;
+		return 0;
+	}
+
 	SPtr<Edge> edge(new Edge(tail, head));
 	tail->add_edge(edge);
 	_objects.insert(edge);
 
 	Forge& forge = _engine->forge();
 
-	SPtr<client::ClientObject> obj(new client::ClientObject(edge->id()));
-	obj->set(URIs::instance().rdf_type,
-	         forge.make_urid(URIs::instance().machina_Edge));
-	obj->set(URIs::instance().machina_probability, forge.make(1.0f));
-	obj->set(URIs::instance().machina_tail_id, forge.make((int32_t)tail->id()));
-	obj->set(URIs::instance().machina_head_id, forge.make((int32_t)head->id()));
+	const Properties properties = {
+		{ URIs::instance().rdf_type,
+		  forge.make_urid(URIs::instance().machina_Edge) },
+		{ URIs::instance().machina_probability, forge.make(1.0f) },
+		{ URIs::instance().machina_tail_id,
+		  forge.make((int32_t)tail->id()) },
+		{ URIs::instance().machina_head_id,
+		  forge.make((int32_t)head->id()) } };
 
-	_client_model.new_object(obj);
+	_model.new_object(edge->id(), properties);
 
 	return edge->id();
 }
@@ -178,7 +187,7 @@ Controller::disconnect(uint64_t tail_id, uint64_t head_id)
 
 	SPtr<Edge> edge = tail->remove_edge_to(head);
 	if (edge) {
-		_client_model.erase_object(edge->id());
+		_model.erase_object(edge->id());
 	} else {
 		std::cerr << "Edge not found" << std::endl;
 	}
@@ -198,7 +207,7 @@ Controller::erase(uint64_t id)
 		_engine->machine()->remove_node(node);
 	}
 
-	_client_model.erase_object((*i)->id());
+	_model.erase_object((*i)->id());
 	_objects.erase(i);
 }
 
@@ -212,14 +221,7 @@ Controller::process_updates()
 	Atom     value;
 	for (uint32_t i = 0; i < read_space; ) {
 		i += read_set(_updates, &subject, &key, &value);
-		SPtr<client::ClientObject> obj = _client_model.find(subject);
-		if (obj) {
-			obj->set(key, value);
-		} else {
-			SPtr<client::ClientObject> obj(new client::ClientObject(subject));
-			obj->set(key, value);
-			_client_model.new_object(obj);
-		}
+		_model.set(subject, key, value);
 	}
 }
 
diff --git a/src/engine/Engine.cpp b/src/engine/Engine.cpp
index 7eeafa4..969b7cc 100644
--- a/src/engine/Engine.cpp
+++ b/src/engine/Engine.cpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -41,13 +41,15 @@ Engine::new_driver(Forge&             forge,
                    const std::string& name,
                    SPtr<Machine>      machine)
 {
-#ifdef HAVE_JACK
 	if (name == "jack") {
+#ifdef HAVE_JACK
 		JackDriver* driver = new JackDriver(forge, machine);
 		driver->attach("machina");
 		return SPtr<Driver>(driver);
-	}
+#else
+		return SPtr<Driver>();
 #endif
+	}
 	if (name == "smf") {
 		return SPtr<Driver>(new SMFDriver(forge, machine->time().unit()));
 	}
diff --git a/src/engine/Updates.cpp b/src/engine/Updates.cpp
index 3193d41..846bf8d 100644
--- a/src/engine/Updates.cpp
+++ b/src/engine/Updates.cpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -44,7 +44,7 @@ read_set(SPtr<Raul::RingBuffer> buf,
          URIInt*                key,
          Atom*                  value)
 {
-	uint32_t update_type;
+	uint32_t update_type = 0;
 	buf->read(sizeof(update_type), &update_type);
 	if (update_type != UPDATE_SET) {
 		return 0;
@@ -53,7 +53,7 @@ read_set(SPtr<Raul::RingBuffer> buf,
 	buf->read(sizeof(*subject), subject);
 	buf->read(sizeof(*key), key);
 
-	LV2_Atom atom;
+	LV2_Atom atom = { 0, 0 };
 	buf->read(sizeof(LV2_Atom), &atom);
 	*value = Atom(atom.size, atom.type, NULL);
 	buf->read(atom.size, value->get_body());
diff --git a/src/engine/machina/Controller.hpp b/src/engine/machina/Controller.hpp
index e745c9c..833b5b2 100644
--- a/src/engine/machina/Controller.hpp
+++ b/src/engine/machina/Controller.hpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -24,8 +24,9 @@
 #include "raul/RingBuffer.hpp"
 #include "raul/Maid.hpp"
 
-#include "machina/types.hpp"
+#include "machina/Model.hpp"
 #include "machina/URIs.hpp"
+#include "machina/types.hpp"
 
 #include "Stateful.hpp"
 
@@ -37,19 +38,13 @@ namespace machina {
 
 class Engine;
 class Machine;
-class Stateful;
-
-namespace client {
-class ClientModel;
-class ClientObject;
-}
 
 class Controller
 {
 public:
-	Controller(SPtr<Engine> engine, client::ClientModel& client_model);
+	Controller(SPtr<Engine> engine, Model& model);
 
-	uint64_t create(const client::ClientObject& obj);
+	uint64_t create(const Properties& properties);
 	uint64_t connect(uint64_t tail_id, uint64_t head_id);
 
 	void set_property(uint64_t object_id, URIInt key, const Atom& value);
@@ -74,8 +69,8 @@ private:
 	typedef std::set<SPtr<Stateful>, StatefulComparator> Objects;
 	Objects _objects;
 
-	SPtr<Engine>         _engine;
-	client::ClientModel& _client_model;
+	SPtr<Engine> _engine;
+	Model&       _model;
 
 	SPtr<Raul::RingBuffer> _updates;
 };
diff --git a/src/engine/machina/Model.hpp b/src/engine/machina/Model.hpp
new file mode 100644
index 0000000..32a332e
--- /dev/null
+++ b/src/engine/machina/Model.hpp
@@ -0,0 +1,44 @@
+/*
+  This file is part of Machina.
+  Copyright 2014 David Robillard <http://drobilla.net>
+
+  Machina 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 3 of the License, or any later version.
+
+  Machina 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 Machina.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef MACHINA_MODEL_HPP
+#define MACHINA_MODEL_HPP
+
+#include <stdint.h>
+
+#include <map>
+
+#include "machina/Atom.hpp"
+#include "machina/types.hpp"
+
+namespace machina {
+
+class Model
+{
+public:
+	virtual ~Model() {}
+
+	virtual void new_object(uint64_t id, const Properties& properties) = 0;
+
+	virtual void erase_object(uint64_t id) = 0;
+
+	virtual void        set(uint64_t id, URIInt key, const Atom& value) = 0;
+	virtual const Atom& get(uint64_t id, URIInt key) const = 0;
+};
+
+}  // namespace machina
+
+#endif  // MACHINA_MODEL_HPP
diff --git a/src/engine/machina/types.hpp b/src/engine/machina/types.hpp
index fff2601..e9ac7d0 100644
--- a/src/engine/machina/types.hpp
+++ b/src/engine/machina/types.hpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -17,6 +17,7 @@
 #ifndef MACHINA_TYPES_HPP
 #define MACHINA_TYPES_HPP
 
+#include <map>
 #include <memory>
 
 #include "raul/RingBuffer.hpp"
@@ -27,6 +28,9 @@ typedef unsigned char byte;
 
 typedef uint32_t URIInt;
 
+class Atom;
+typedef std::map<URIInt, Atom> Properties;
+
 #if __cplusplus >= 201103L
 template <class T>
 using SPtr = std::shared_ptr<T>;
diff --git a/src/engine/wscript b/src/engine/wscript
index 80f03a4..e1fc1ab 100644
--- a/src/engine/wscript
+++ b/src/engine/wscript
@@ -23,7 +23,7 @@ def build(bld):
             Updates.cpp
             URIs.cpp
     '''
-    if bld.is_defined('HAVE_EUGENE'):
+    if bld.env.HAVE_EUGENE:
         core_source += '''
                 Evolver.cpp
                 Problem.cpp
@@ -35,7 +35,7 @@ def build(bld):
     obj.name     = 'libmachina_engine'
     obj.target   = 'machina_engine'
     core_libs = 'RAUL GLIBMM GTHREAD RAUL SERD SORD JACK LV2'
-    if bld.is_defined('HAVE_EUGENE'):
+    if bld.env.HAVE_EUGENE:
         core_libs += ' EUGENE '
     autowaf.use_lib(bld, obj, core_libs)
 
diff --git a/src/gui/MachinaCanvas.cpp b/src/gui/MachinaCanvas.cpp
index 76c029c..f7292bf 100644
--- a/src/gui/MachinaCanvas.cpp
+++ b/src/gui/MachinaCanvas.cpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -182,14 +182,17 @@ MachinaCanvas::on_erase_object(SPtr<client::ClientObject> object)
 void
 MachinaCanvas::action_create_node(double x, double y)
 {
-	machina::client::ClientObject obj(0);
-	obj.set(URIs::instance().rdf_type,
-	        _app->forge().make_urid(URIs::instance().machina_Node));
-	obj.set(URIs::instance().machina_canvas_x, _app->forge().make((float)x));
-	obj.set(URIs::instance().machina_canvas_y, _app->forge().make((float)y));
-	obj.set(URIs::instance().machina_duration,
-	        _app->forge().make((float)_app->default_length()));
-	_app->controller()->create(obj);
+	const Properties props = {
+		{ URIs::instance().rdf_type,
+		  _app->forge().make_urid(URIs::instance().machina_Node) },
+		{ URIs::instance().machina_canvas_x,
+		  _app->forge().make((float)x) },
+		{ URIs::instance().machina_canvas_y,
+		  _app->forge().make((float)y) },
+		{ URIs::instance().machina_duration,
+		  _app->forge().make((float)_app->default_length()) } };
+
+	_app->controller()->create(props);
 }
 
 void
diff --git a/src/gui/main.cpp b/src/gui/main.cpp
index 407258d..547966f 100644
--- a/src/gui/main.cpp
+++ b/src/gui/main.cpp
@@ -1,6 +1,6 @@
 /*
   This file is part of Machina.
-  Copyright 2007-2013 David Robillard <http://drobilla.net>
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
 
   Machina 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
@@ -80,13 +80,13 @@ main(int argc, char** argv)
 		machine = SPtr<Machine>(new Machine(beats));
 	}
 
-	std::string driver_name = "smf";
-#ifdef HAVE_JACK
-	driver_name = "jack";
-#endif
+	// Create driver
+	SPtr<Driver> driver(Engine::new_driver(forge, "jack", machine));
+	if (!driver) {
+		cerr << "warning: Failed to create Jack driver, using SMF" << endl;
+		driver = SPtr<Driver>(Engine::new_driver(forge, "smf", machine));
+	}
 
-	// Build engine
-	SPtr<Driver> driver(Engine::new_driver(forge, driver_name, machine));
 	SPtr<Engine> engine(new Engine(forge, driver, rdf_world));
 
 	Gtk::Main app(argc, argv);