From 9746a6362526605560da40533032a9299e9bf3f9 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 6 Oct 2020 23:33:28 +0200
Subject: [PATCH] VST3: implement ChannelContext::IInfoListener

---
 libs/ardour/ardour/vst3_plugin.h |  5 +++
 libs/ardour/vst3_host.cc         |  3 ++
 libs/ardour/vst3_plugin.cc       | 71 ++++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+)

diff --git a/libs/ardour/ardour/vst3_plugin.h b/libs/ardour/ardour/vst3_plugin.h
index 8215a55ae1..364950076b 100644
--- a/libs/ardour/ardour/vst3_plugin.h
+++ b/libs/ardour/ardour/vst3_plugin.h
@@ -181,6 +181,11 @@ private:
 	bool midi_controller (int32_t, int16_t, Vst::CtrlNumber, Vst::ParamID &id);
 	bool live_midi_cc (int32_t, int16_t, Vst::CtrlNumber);
 
+	void setup_info_listener ();
+	void stripable_property_changed (PBD::PropertyChange const&);
+
+	PBD::ScopedConnectionList _strip_connections;
+
 	boost::shared_ptr<ARDOUR::VST3PluginModule> _module;
 
 	std::vector <Vst::IConnectionPoint*> _connections;
diff --git a/libs/ardour/vst3_host.cc b/libs/ardour/vst3_host.cc
index 507e22a6f1..31f93cbe46 100644
--- a/libs/ardour/vst3_host.cc
+++ b/libs/ardour/vst3_host.cc
@@ -58,6 +58,7 @@ DEF_CLASS_IID (Vst::IProgramListData)
 DEF_CLASS_IID (Vst::IStreamAttributes)
 DEF_CLASS_IID (Vst::IUnitData)
 DEF_CLASS_IID (Vst::IUnitInfo)
+DEF_CLASS_IID (Vst::ChannelContext::IInfoListener)
 
 #if SMTG_OS_LINUX
 DEF_CLASS_IID (Linux::IRunLoop);
@@ -315,7 +316,9 @@ PlugInterfaceSupport::PlugInterfaceSupport ()
 	addPlugInterfaceSupported (INoteExpressionController::iid);
 
 	//---VST 3.6.5--------------------------------
+#endif
 	addPlugInterfaceSupported (ChannelContext::IInfoListener::iid);
+#if 0
 	addPlugInterfaceSupported (IPrefetchableSupport::iid);
 	addPlugInterfaceSupported (IAutomationState::iid);
 
diff --git a/libs/ardour/vst3_plugin.cc b/libs/ardour/vst3_plugin.cc
index d1d5ba8378..8f27340ff1 100644
--- a/libs/ardour/vst3_plugin.cc
+++ b/libs/ardour/vst3_plugin.cc
@@ -35,6 +35,7 @@
 #include "ardour/audio_buffer.h"
 #include "ardour/audioengine.h"
 #include "ardour/session.h"
+#include "ardour/stripable.h"
 #include "ardour/tempo.h"
 #include "ardour/utils.h"
 #include "ardour/vst3_module.h"
@@ -1462,6 +1463,11 @@ void
 VST3PI::set_owner (SessionObject* o)
 {
 	_owner = o;
+	if (!o) {
+		_strip_connections.drop_connections ();
+		return;
+	}
+	setup_info_listener ();
 }
 
 int32
@@ -2254,6 +2260,71 @@ VST3PI::save_state (RAMStream& stream)
 	return entries.size () > 0;
 }
 
+/* ****************************************************************************/
+
+void
+VST3PI::stripable_property_changed (PBD::PropertyChange const&)
+{
+	FUnknownPtr<Vst::ChannelContext::IInfoListener> il (_controller);
+	Stripable* s = dynamic_cast<Stripable*> (_owner);
+	assert (il && s);
+
+	IPtr<HostAttributeList> al (new HostAttributeList ());
+
+	Vst::String128 tmp;
+	utf8_to_tchar (tmp, _owner->name(), 128);
+	al->setInt (Vst::ChannelContext::kChannelNameLengthKey, _owner->name().size());
+	al->setString (Vst::ChannelContext::kChannelNameKey, tmp);
+
+	utf8_to_tchar (tmp, _owner->id().to_s(), 128);
+	al->setInt (Vst::ChannelContext::kChannelNameLengthKey, _owner->id().to_s().size());
+	al->setString (Vst::ChannelContext::kChannelUIDKey, tmp);
+
+	std::string ns;
+	int order_key;
+	if (s->is_master ()) {
+		ns = _("Master");
+		order_key = 2;
+	} else if (s->is_monitor ()) {
+		ns = _("Monitor");
+		order_key = 3;
+	} else {
+		ns = _("Track");
+		order_key = 1;
+	}
+
+	al->setInt (Vst::ChannelContext::kChannelIndexNamespaceOrderKey, order_key);
+	al->setInt (Vst::ChannelContext::kChannelIndexKey, 1 + s->presentation_info ().order());
+
+	utf8_to_tchar (tmp, ns, 128);
+	al->setInt (Vst::ChannelContext::kChannelIndexNamespaceLengthKey, ns.size());
+	al->setString (Vst::ChannelContext::kChannelIndexNamespaceKey, tmp);
+
+	uint32_t rgba = s->presentation_info ().color();
+	Vst::ChannelContext::ColorSpec argb = ((rgba >> 8) & 0xffffff) | ((rgba & 0xff) << 24);
+	al->setInt (Vst::ChannelContext::kChannelColorKey, argb);
+
+	al->setInt (Vst::ChannelContext::kChannelPluginLocationKey, Vst::ChannelContext::kPreVolumeFader); // XXX
+
+	il->setChannelContextInfos (al);
+}
+
+void
+VST3PI::setup_info_listener ()
+{
+	FUnknownPtr<Vst::ChannelContext::IInfoListener> il (_controller);
+	if (!il) {
+		return;
+	}
+	Stripable* s = dynamic_cast<Stripable*> (_owner);
+
+	s->PropertyChanged.connect_same_thread (_strip_connections, boost::bind (&VST3PI::stripable_property_changed, this, _1));
+	s->presentation_info().PropertyChanged.connect_same_thread (_strip_connections, boost::bind (&VST3PI::stripable_property_changed, this, _1));
+
+	/* send initial change */
+	stripable_property_changed (PropertyChange ());
+}
+
 /* ****************************************************************************
  * GUI
  */