From b65f18a56e0ef7b4e9be10e7c94c48357cc3a68d Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 1 Nov 2021 09:14:02 -0600
Subject: [PATCH] triggerbox: basics of scene triggering

---
 libs/ardour/ardour/triggerbox.h |  7 +++++++
 libs/ardour/triggerbox.cc       | 29 +++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/libs/ardour/ardour/triggerbox.h b/libs/ardour/ardour/triggerbox.h
index 072ca87528..9bbbc75d58 100644
--- a/libs/ardour/ardour/triggerbox.h
+++ b/libs/ardour/ardour/triggerbox.h
@@ -381,6 +381,11 @@ class LIBARDOUR_API TriggerBox : public Processor
 	static int first_midi_note() { return _first_midi_note; }
 	static void set_first_midi_note (int n);
 
+	static void maybe_find_scene_bang ();
+	static void clear_scene_bang ();
+	static void scene_bang (uint32_t scene_number);
+	static void scene_unbang (uint32_t scene_number);
+
   private:
 	static Temporal::BBT_Offset _assumed_trigger_duration;
 
@@ -421,6 +426,8 @@ class LIBARDOUR_API TriggerBox : public Processor
 	static const uint64_t default_triggers_per_box;
 	static int _first_midi_note;
 	static TriggerMidiMapMode _midi_map_mode;
+	static std::atomic<int32_t> _pending_scene;
+	static std::atomic<int32_t> _active_scene;
 };
 
 namespace Properties {
diff --git a/libs/ardour/triggerbox.cc b/libs/ardour/triggerbox.cc
index bf604224ab..ba95c4e6e2 100644
--- a/libs/ardour/triggerbox.cc
+++ b/libs/ardour/triggerbox.cc
@@ -1322,6 +1322,8 @@ Temporal::BBT_Offset TriggerBox::_assumed_trigger_duration (4, 0, 0);
 //TriggerBox::TriggerMidiMapMode TriggerBox::_midi_map_mode (TriggerBox::AbletonPush);
 TriggerBox::TriggerMidiMapMode TriggerBox::_midi_map_mode (TriggerBox::SequentialNote);
 int TriggerBox::_first_midi_note = 60;
+std::atomic<int32_t> TriggerBox::_pending_scene (-1);
+std::atomic<int32_t> TriggerBox::_active_scene (-1);
 
 TriggerBox::TriggerBox (Session& s, DataType dt)
 	: Processor (s, _("TriggerBox"), Temporal::BeatTime)
@@ -1352,6 +1354,33 @@ TriggerBox::TriggerBox (Session& s, DataType dt)
 	Config->ParameterChanged.connect_same_thread (*this, boost::bind (&TriggerBox::parameter_changed, this, _1));
 }
 
+void
+TriggerBox::scene_bang (uint32_t n)
+{
+	_pending_scene = n;
+}
+
+void
+TriggerBox::scene_unbang (uint32_t n)
+{
+}
+
+void
+TriggerBox::maybe_find_scene_bang ()
+{
+	uint32_t pending = _pending_scene.exchange (-1);
+
+	if (pending >= 0) {
+		_active_scene = pending;
+	}
+}
+
+void
+TriggerBox::clear_scene_bang ()
+{
+	(void) _active_scene.exchange (-1);
+}
+
 void
 TriggerBox::clear_implicit ()
 {