Init (fake) juce events if using custom plugin entries (for LMMS)

source/backend/engine/CarlaEngineNative.cpp

@@ -38,6 +38,14 @@
 
 #include "juce_audio_basics.h"
 
+#if defined(CARLA_OS_MAC) || defined(CARLA_OS_WIN)
+# include "juce_gui_basics.h"
+#else
+namespace juce {
+# include "juce_events/messages/juce_Initialisation.h"
+} // namespace juce
+#endif
+
 using juce::File;
 using juce::FloatVectorOperations;
 using juce::MemoryOutputStream;
@@ -46,6 +54,9 @@ using juce::String;
 using juce::XmlDocument;
 using juce::XmlElement;
 
+static bool gNeedsJuceHandling = false;
+static int  gJuceReferenceCounter = 0;
+
 CARLA_BACKEND_START_NAMESPACE
 
 // -----------------------------------------------------------------------
@@ -561,6 +572,11 @@ public:
     {
         carla_debug("CarlaEngineNative::CarlaEngineNative()");
 
+        CARLA_SAFE_ASSERT_INT(gJuceReferenceCounter >= 0, gJuceReferenceCounter);
+
+        if (gNeedsJuceHandling && ++gJuceReferenceCounter == 1)
+            juce::initialiseJuce_GUI();
+
         carla_zeroChar(fTmpBuf, STR_MAX+1);
 
         // set-up engine
@@ -610,6 +626,9 @@ public:
 
         pData->graph.destroy();
 
+        if (gNeedsJuceHandling && --gJuceReferenceCounter == 0)
+            juce::shutdownJuce_GUI();
+
         carla_debug("CarlaEngineNative::~CarlaEngineNative() - END");
     }
 
@@ -1583,6 +1602,9 @@ CARLA_EXPORT
 const NativePluginDescriptor* carla_get_native_rack_plugin();
 const NativePluginDescriptor* carla_get_native_rack_plugin()
 {
+    // if this is called then we're running as special plugin
+    gNeedsJuceHandling = true;
+
     CARLA_BACKEND_USE_NAMESPACE;
     return &carlaRackDesc;
 }
@@ -1591,6 +1613,9 @@ CARLA_EXPORT
 const NativePluginDescriptor* carla_get_native_patchbay_plugin();
 const NativePluginDescriptor* carla_get_native_patchbay_plugin()
 {
+    // if this is called then we're running as special plugin
+    gNeedsJuceHandling = true;
+
     CARLA_BACKEND_USE_NAMESPACE;
     return &carlaPatchbayDesc;
 }