From 2e00638761d08ae764bb6a7bd619640850d456ea Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 30 Jan 2024 23:03:12 +0100
Subject: [PATCH] Vapor: add AutomationControl to en/disable surround send

This is in preparation to allow grouping send-enable.
---
 libs/ardour/ardour/surround_send.h | 16 +++++++++-----
 libs/ardour/surround_send.cc       | 34 ++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/libs/ardour/ardour/surround_send.h b/libs/ardour/ardour/surround_send.h
index 9539f109ca..e7746fe35c 100644
--- a/libs/ardour/ardour/surround_send.h
+++ b/libs/ardour/ardour/surround_send.h
@@ -67,6 +67,7 @@ public:
 	BufferSet const& bufs () const { return _mixbufs; }
 
 	std::shared_ptr<SurroundPannable> const& pan_param (size_t chn, timepos_t& s, timepos_t& e) const;
+	std::shared_ptr<AutomationControl> send_enable_control () const { return _send_enable_control; }
 
 protected:
 	int set_state (const XMLNode&, int version);
@@ -78,20 +79,25 @@ private:
 	void   cycle_start (pframes_t);
 	void   add_pannable ();
 
+	void send_enable_changed ();
+	void proc_active_changed ();
+
 	BufferSet _mixbufs;
 	int32_t   _surround_id;
 	timepos_t _cycle_start;
 	timepos_t _cycle_end;
 	gain_t    _current_gain;
 	bool      _has_state;
+	bool      _ignore_enable_change;
 
 	std::vector<std::shared_ptr<SurroundPannable>> _pannable;
 
-	std::shared_ptr<GainControl>      _gain_control;
-	std::shared_ptr<Amp>              _amp;
-	std::shared_ptr<MuteMaster>       _mute_master;
-	std::shared_ptr<DelayLine>        _send_delay;
-	std::shared_ptr<DelayLine>        _thru_delay;
+	std::shared_ptr<AutomationControl> _send_enable_control;
+	std::shared_ptr<GainControl>       _gain_control;
+	std::shared_ptr<Amp>               _amp;
+	std::shared_ptr<MuteMaster>        _mute_master;
+	std::shared_ptr<DelayLine>         _send_delay;
+	std::shared_ptr<DelayLine>         _thru_delay;
 
 	PBD::ScopedConnectionList _change_connections;
 };
diff --git a/libs/ardour/surround_send.cc b/libs/ardour/surround_send.cc
index d3201c01e5..0fa2a2ab88 100644
--- a/libs/ardour/surround_send.cc
+++ b/libs/ardour/surround_send.cc
@@ -17,6 +17,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include "pbd/unwind.h"
+
 #include "ardour/surround_send.h"
 #include "ardour/amp.h"
 #include "ardour/audioengine.h"
@@ -37,6 +39,7 @@ SurroundSend::SurroundSend (Session& s, std::shared_ptr<MuteMaster> mm)
 	, _surround_id (s.next_surround_send_id ())
 	, _current_gain (GAIN_COEFF_ZERO)
 	, _has_state (false)
+	, _ignore_enable_change (false)
 	, _mute_master (mm)
 
 {
@@ -53,11 +56,18 @@ SurroundSend::SurroundSend (Session& s, std::shared_ptr<MuteMaster> mm)
 
 	add_control (_gain_control);
 
+	_send_enable_control = std::shared_ptr<AutomationControl> (new AutomationControl (_session, BusSendEnable, ParameterDescriptor(BusSendEnable)));
+	_send_enable_control->Changed.connect_same_thread (*this, boost::bind (&SurroundSend::send_enable_changed, this));
+	_send_enable_control->clear_flag (PBD::Controllable::RealTime);
+
+	ActiveChanged.connect_same_thread (*this, boost::bind (&SurroundSend::proc_active_changed, this));
+
 	InternalSend::CycleStart.connect_same_thread (*this, boost::bind (&SurroundSend::cycle_start, this, _1));
 }
 
 SurroundSend::~SurroundSend ()
 {
+	_send_enable_control->drop_references ();
 }
 
 std::shared_ptr<SurroundPannable>
@@ -396,6 +406,30 @@ SurroundSend::describe_parameter (Evoral::Parameter param)
 	return Automatable::describe_parameter (param);
 }
 
+void
+SurroundSend::send_enable_changed ()
+{
+	if (_ignore_enable_change) {
+		return;
+	}
+	PBD::Unwinder<bool> uw (_ignore_enable_change, true);
+	if (_send_enable_control->get_value () > 0) {
+		activate ();
+	} else {
+		deactivate ();
+	}
+}
+
+void
+SurroundSend::proc_active_changed ()
+{
+	if (_ignore_enable_change) {
+		return;
+	}
+	PBD::Unwinder<bool> uw (_ignore_enable_change, true);
+	_send_enable_control->set_value (_pending_active ? 1 : 0, PBD::Controllable::UseGroup);
+}
+
 int
 SurroundSend::set_state (const XMLNode& node, int version)
 {