From 3271a9610056132d5b57eefb94daf3a2580b676b Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Thu, 15 Oct 2020 20:40:35 +0200
Subject: [PATCH] VST3: allow to debug TUID support

---
 libs/ardour/vst3_host.cc   | 13 +++++++++++++
 libs/ardour/vst3_plugin.cc | 14 ++++++++++++++
 libs/fst/wscript           |  1 +
 3 files changed, 28 insertions(+)

diff --git a/libs/ardour/vst3_host.cc b/libs/ardour/vst3_host.cc
index d779d066e0..65fc73284b 100644
--- a/libs/ardour/vst3_host.cc
+++ b/libs/ardour/vst3_host.cc
@@ -26,6 +26,11 @@
 
 #include "ardour/vst3_host.h"
 
+#ifndef VST3_SCANNER_APP
+#include "pbd/compose.h"
+#include "ardour/debug.h"
+#endif
+
 using namespace Steinberg;
 
 DEF_CLASS_IID (FUnknown)
@@ -384,6 +389,14 @@ HostApplication::queryInterface (const char* _iid, void** obj)
 		return kResultOk;
 	}
 
+#ifndef VST3_SCANNER_APP
+	if (DEBUG_ENABLED(PBD::DEBUG::VST3Config)) {
+		char fuid[33];
+		FUID::fromTUID (_iid).toString (fuid);
+		DEBUG_TRACE (PBD::DEBUG::VST3Config, string_compose ("HostApplication::queryInterface not supported: %1\n", fuid));
+	}
+#endif
+
 	*obj = nullptr;
 	return kResultFalse;
 }
diff --git a/libs/ardour/vst3_plugin.cc b/libs/ardour/vst3_plugin.cc
index 6c6d7357f1..e65adf4c38 100644
--- a/libs/ardour/vst3_plugin.cc
+++ b/libs/ardour/vst3_plugin.cc
@@ -987,6 +987,14 @@ VST3PI::VST3PI (boost::shared_ptr<ARDOUR::VST3PluginModule> m, std::string uniqu
 		throw failed_constructor ();
 	}
 
+#ifndef NDEBUG
+	if (DEBUG_ENABLED(DEBUG::VST3Config)) {
+		char fuid[33];
+		_fuid.toString (fuid);
+		DEBUG_TRACE (DEBUG::VST3Config, string_compose ("VST3PI create instance %1\n", fuid));
+	}
+#endif
+
 	if (factory->createInstance (_fuid.toTUID (), Vst::IComponent::iid, (void**)&_component) != kResultTrue) {
 		throw failed_constructor ();
 	}
@@ -1286,6 +1294,12 @@ VST3PI::queryInterface (const TUID _iid, void** obj)
 	}
 #endif
 
+	if (DEBUG_ENABLED(DEBUG::VST3Config)) {
+		char fuid[33];
+		FUID::fromTUID (_iid).toString (fuid);
+		DEBUG_TRACE (DEBUG::VST3Config, string_compose ("VST3PI::queryInterface not supported: %1\n", fuid));
+	}
+
 	*obj = nullptr;
 	return kNoInterface;
 }
diff --git a/libs/fst/wscript b/libs/fst/wscript
index b1bec98e51..693fc1d8cd 100644
--- a/libs/fst/wscript
+++ b/libs/fst/wscript
@@ -45,6 +45,7 @@ def build(bld):
         obj.target    = 'ardour-vst3-scanner'
         obj.includes  = [ '../pbd/', '../ardour/', '../vst3/', '..' ]
         obj.defines   = [
+            'VST3_SCANNER_APP',
             'VERSIONSTRING="' + str(bld.env['VERSION']) + '"',
             'PACKAGE="' + I18N_PACKAGE + str(bld.env['MAJOR']) + '"',
             'LIBARDOUR="' + bld.env['lwrcase_dirname'] + '"',