refacto: RenderingEngine::get_scene_manager() is now not callable from singleton

This permits to make evidence that we have some bad object passing on various code parts. I fixed majority of them to reduce the scope of passed objects

Unfortunately, for some edge cases i should have to expose ISceneManager from client, this should be fixed in the future when our POO will be cleaner client side (we have a mix of rendering and processing in majority of the client objects, it works but it's not clean)

src/client/client.cpp

@@ -1475,6 +1475,11 @@ bool Client::updateWieldedItem()
 	return true;
 }
 
+irr::scene::ISceneManager* Client::getSceneManager()
+{
+	return m_rendering_engine->get_scene_manager();
+}
+
 Inventory* Client::getInventory(const InventoryLocation &loc)
 {
 	switch(loc.type){

src/client/client.h

@@ -355,6 +355,7 @@ public:
 	void setCamera(Camera* camera) { m_camera = camera; }
 
 	Camera* getCamera () { return m_camera; }
+	irr::scene::ISceneManager *getSceneManager();
 
 	bool shouldShowMinimap() const;
 

src/client/clientenvironment.cpp

@@ -352,7 +352,7 @@ u16 ClientEnvironment::addActiveObject(ClientActiveObject *object)
 	if (!m_ao_manager.registerObject(object))
 		return 0;
 
-	object->addToScene(m_texturesource, RenderingEngine::get_scene_manager());
+	object->addToScene(m_texturesource, m_client->getSceneManager());
 
 	// Update lighting immediately
 	object->updateLight(getDayNightRatio());

src/client/content_mapblock.cpp

@@ -60,18 +60,16 @@ static constexpr u16 quad_indices[] = {0, 1, 2, 2, 3, 0};
 
 const std::string MapblockMeshGenerator::raillike_groupname = "connect_to_raillike";
 
-MapblockMeshGenerator::MapblockMeshGenerator(MeshMakeData *input, MeshCollector *output)
+MapblockMeshGenerator::MapblockMeshGenerator(MeshMakeData *input, MeshCollector *output,
+	irr::scene::IMeshManipulator *mm):
+	data(input),
+	collector(output),
+	nodedef(data->m_client->ndef()),
+	meshmanip(mm),
+	blockpos_nodes(data->m_blockpos * MAP_BLOCKSIZE)
 {
-	data      = input;
-	collector = output;
-
-	nodedef   = data->m_client->ndef();
-	meshmanip = RenderingEngine::get_scene_manager()->getMeshManipulator();
-
 	enable_mesh_cache = g_settings->getBool("enable_mesh_cache") &&
 		!data->m_smooth_lighting; // Mesh cache is not supported with smooth lighting
-
-	blockpos_nodes = data->m_blockpos * MAP_BLOCKSIZE;
 }
 
 void MapblockMeshGenerator::useTile(int index, u8 set_flags, u8 reset_flags, bool special)

src/client/content_mapblock.h

@@ -172,7 +172,8 @@ public:
 	void drawNode();
 
 public:
-	MapblockMeshGenerator(MeshMakeData *input, MeshCollector *output);
+	MapblockMeshGenerator(MeshMakeData *input, MeshCollector *output,
+			irr::scene::IMeshManipulator *mm);
 	void generate();
 	void renderSingle(content_t node, u8 param2 = 0x00);
 };

src/client/mapblock_mesh.cpp

@@ -1072,8 +1072,8 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data, v3s16 camera_offset):
 	*/
 
 	{
-		MapblockMeshGenerator generator(data, &collector);
+		MapblockMeshGenerator(data, &collector,
-		generator.generate();
+			data->m_client->getSceneManager()->getMeshManipulator()).generate();
 	}
 
 	/*

src/client/particles.cpp

@@ -64,8 +64,8 @@ Particle::Particle(
 	v2f texsize,
 	video::SColor color
 ):
-	scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
+	scene::ISceneNode(((Client *)gamedef)->getSceneManager()->getRootSceneNode(),
-		RenderingEngine::get_scene_manager())
+		((Client *)gamedef)->getSceneManager())
 {
 	// Misc
 	m_gamedef = gamedef;

src/client/renderingengine.h

@@ -79,10 +79,9 @@ public:
 		return s_singleton->m_device->getVideoDriver();
 	}
 
-	static scene::ISceneManager *get_scene_manager()
+	scene::ISceneManager *get_scene_manager()
 	{
-		sanity_check(s_singleton && s_singleton->m_device);
+		return m_device->getSceneManager();
-		return s_singleton->m_device->getSceneManager();
 	}
 
 	static irr::IrrlichtDevice *get_raw_device()

src/client/wieldmesh.cpp

@@ -307,7 +307,8 @@ static scene::SMesh *createSpecialNodeMesh(Client *client, MapNode n,
 	MeshMakeData mesh_make_data(client, false);
 	MeshCollector collector;
 	mesh_make_data.setSmoothLighting(false);
-	MapblockMeshGenerator gen(&mesh_make_data, &collector);
+	MapblockMeshGenerator gen(&mesh_make_data, &collector,
+		client->getSceneManager()->getMeshManipulator());
 
 	if (n.getParam2()) {
 		// keep it

src/gui/guiFormSpecMenu.cpp

@@ -2794,7 +2794,7 @@ void GUIFormSpecMenu::parseModel(parserData *data, const std::string &element)
 
 	core::rect<s32> rect(pos, pos + geom);
 
-	GUIScene *e = new GUIScene(Environment, RenderingEngine::get_scene_manager(),
+	GUIScene *e = new GUIScene(Environment, m_client->getSceneManager(),
 			data->current_parent, rect, spec.fid);
 
 	auto meshnode = e->setMesh(mesh);

src/nodedef.cpp

@@ -1446,8 +1446,8 @@ void NodeDefManager::updateTextures(IGameDef *gamedef,
 	Client *client = (Client *)gamedef;
 	ITextureSource *tsrc = client->tsrc();
 	IShaderSource *shdsrc = client->getShaderSource();
-	scene::IMeshManipulator *meshmanip =
+	auto smgr = client->getSceneManager();
-		RenderingEngine::get_scene_manager()->getMeshManipulator();
+	scene::IMeshManipulator *meshmanip = smgr->getMeshManipulator();
 	TextureSettings tsettings;
 	tsettings.readSettings();