Allow carla-plugin to have full access to Host API

Signed-off-by: falkTX <falktx@falktx.com>

source/includes/CarlaNativePlugin.h

@@ -1,6 +1,6 @@
 /*
  * Carla Plugin Host
- * Copyright (C) 2011-2019 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2011-2020 Filipe Coelho <falktx@falktx.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -18,8 +18,8 @@
 #ifndef CARLA_NATIVE_PLUGIN_H_INCLUDED
 #define CARLA_NATIVE_PLUGIN_H_INCLUDED
 
-#include "CarlaBackend.h"
 #include "CarlaNative.h"
+#include "CarlaHost.h"
 
 #ifndef CARLA_HOST_H_INCLUDED
 #ifndef CARLA_UTILS_H_INCLUDED
@@ -65,11 +65,25 @@ CARLA_EXPORT const NativePluginDescriptor* carla_get_native_patchbay64_plugin(vo
  */
 CARLA_EXPORT const NativePluginDescriptor* carla_get_native_patchbay_cv_plugin(void);
 
+/*!
+ * Create a CarlaHostHandle suitable for CarlaHost API calls.
+ * Returned value must be freed by the caller when no longer needed.
+ */
+CARLA_EXPORT CarlaHostHandle carla_create_native_plugin_host_handle(const NativePluginDescriptor* desc,
+                                                                    NativePluginHandle handle);
+
+/*!
+ * Free memory created during carla_create_native_plugin_host_handle.
+ */
+CARLA_EXPORT void carla_host_handle_free(CarlaHostHandle handle);
+
 #ifdef __cplusplus
 /*!
  * Get the internal CarlaEngine instance.
+ * @deprecated Please use carla_create_native_plugin_host_handle instead
  */
-CARLA_EXPORT CarlaBackend::CarlaEngine* carla_get_native_plugin_engine(const NativePluginDescriptor* desc, NativePluginHandle handle);
+CARLA_EXPORT CarlaBackend::CarlaEngine* carla_get_native_plugin_engine(const NativePluginDescriptor* desc,
+                                                                       NativePluginHandle handle);
 #endif
 
 #endif /* CARLA_NATIVE_PLUGIN_H_INCLUDED */

source/plugin/carla-native-plugin.cpp

@@ -16,6 +16,7 @@
  */
 
 #include "CarlaNativePlugin.h"
+#include "CarlaHostImpl.hpp"
 
 #include "CarlaEngine.hpp"
 #include "CarlaString.hpp"
@@ -26,6 +27,32 @@ CARLA_BACKEND_USE_NAMESPACE
 
 // --------------------------------------------------------------------------------------------------------------------
 
+CarlaHostHandle carla_create_native_plugin_host_handle(const NativePluginDescriptor* desc, NativePluginHandle handle)
+{
+    CarlaEngine* const engine = carla_get_native_plugin_engine(desc, handle);
+    CARLA_SAFE_ASSERT_RETURN(engine, nullptr);
+
+    CarlaHostHandleImpl* hosthandle;
+
+    try {
+        hosthandle = new CarlaHostHandleImpl();
+    } CARLA_SAFE_EXCEPTION_RETURN("carla_create_native_plugin_host_handle()", nullptr);
+
+    hosthandle->engine = engine;
+    hosthandle->isPlugin = true;
+    return hosthandle;
+}
+
+void carla_host_handle_free(CarlaHostHandle handle)
+{
+    CARLA_SAFE_ASSERT_RETURN(handle != nullptr,);
+    CARLA_SAFE_ASSERT_RETURN(handle->isPlugin,);
+
+    delete (CarlaHostHandleImpl*)handle;
+}
+
+// --------------------------------------------------------------------------------------------------------------------
+
 CarlaEngine* carla_get_native_plugin_engine(const NativePluginDescriptor* desc, NativePluginHandle handle)
 {
     CARLA_SAFE_ASSERT_RETURN(desc != nullptr, nullptr);