Schematics: Remove referenced schematics from Decorations on clear

src/mg_biome.h

@@ -61,7 +61,7 @@ class BiomeManager : public ObjDefManager {
 	static const char *OBJECT_TITLE;
 
 	BiomeManager(IGameDef *gamedef);
-	~BiomeManager();
+	virtual ~BiomeManager();
 
 	const char *getObjectTitle() const
 	{
@@ -73,7 +73,7 @@ class BiomeManager : public ObjDefManager {
 		return new Biome;
 	}
 
-	void clear();
+	virtual void clear();
 
 	void calcBiomes(s16 sx, s16 sy, float *heat_map, float *humidity_map,
 		s16 *height_map, u8 *biomeid_map);

src/mg_decoration.cpp

@@ -61,16 +61,6 @@ size_t DecorationManager::placeAllDecos(Mapgen *mg, u32 blockseed,
 }
 
 
-void DecorationManager::clear()
-{
-	for (size_t i = 0; i < m_objects.size(); i++) {
-		Decoration *deco = (Decoration *)m_objects[i];
-		delete deco;
-	}
-	m_objects.clear();
-}
-
-
 ///////////////////////////////////////////////////////////////////////////////
 
 
@@ -320,8 +310,20 @@ int DecoSimple::getHeight()
 ///////////////////////////////////////////////////////////////////////////////
 
 
+DecoSchematic::DecoSchematic() :
+	Decoration::Decoration()
+{
+	schematic = NULL;
+}
+
+
 size_t DecoSchematic::generate(MMVManip *vm, PseudoRandom *pr, v3s16 p)
 {
+	// Schematic could have been unloaded but not the decoration
+	// In this case generate() does nothing (but doesn't *fail*)
+	if (schematic == NULL)
+		return 0;
+
 	if (flags & DECO_PLACE_CENTER_X)
 		p.X -= (schematic->size.X + 1) / 2;
 	if (flags & DECO_PLACE_CENTER_Y)

src/mg_decoration.h

@@ -61,7 +61,16 @@ struct CutoffData {
 
 class Decoration : public ObjDef, public NodeResolver {
 public:
-	INodeDefManager *ndef;
+	Decoration();
+	virtual ~Decoration();
+
+	virtual void resolveNodeNames();
+
+	size_t placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
+	//size_t placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
+
+	virtual size_t generate(MMVManip *vm, PseudoRandom *pr, v3s16 p) = 0;
+	virtual int getHeight() = 0;
 
 	u32 flags;
 	int mapseed;
@@ -75,42 +84,32 @@ class Decoration : public ObjDef, public NodeResolver {
 	std::set<u8> biomes;
 	//std::list<CutoffData> cutoffs;
 	//JMutex cutoff_mutex;
-
-	Decoration();
-	virtual ~Decoration();
-
-	virtual void resolveNodeNames();
-
-	size_t placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
-	//size_t placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
-
-	virtual size_t generate(MMVManip *vm, PseudoRandom *pr, v3s16 p) = 0;
-	virtual int getHeight() = 0;
 };
 
 class DecoSimple : public Decoration {
 public:
+	virtual size_t generate(MMVManip *vm, PseudoRandom *pr, v3s16 p);
+	bool canPlaceDecoration(MMVManip *vm, v3s16 p);
+	virtual int getHeight();
+
+	virtual void resolveNodeNames();
+
 	std::vector<content_t> c_decos;
 	std::vector<content_t> c_spawnby;
 	s16 deco_height;
 	s16 deco_height_max;
 	s16 nspawnby;
-
-	virtual void resolveNodeNames();
-
-	bool canPlaceDecoration(MMVManip *vm, v3s16 p);
-	virtual size_t generate(MMVManip *vm, PseudoRandom *pr, v3s16 p);
-	virtual int getHeight();
 };
 
 class DecoSchematic : public Decoration {
 public:
-	Rotation rotation;
-	Schematic *schematic;
-	std::string filename;
+	DecoSchematic();
 
 	virtual size_t generate(MMVManip *vm, PseudoRandom *pr, v3s16 p);
 	virtual int getHeight();
+
+	Rotation rotation;
+	Schematic *schematic;
 };
 
 
@@ -124,7 +123,7 @@ class DecoLSystem : public Decoration {
 class DecorationManager : public ObjDefManager {
 public:
 	DecorationManager(IGameDef *gamedef);
-	~DecorationManager() {}
+	virtual ~DecorationManager() {}
 
 	const char *getObjectTitle() const
 	{
@@ -145,8 +144,6 @@ class DecorationManager : public ObjDefManager {
 		}
 	}
 
-	void clear();
-
 	size_t placeAllDecos(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
 };
 

src/mg_ore.h

@@ -115,7 +115,7 @@ class OreVein : public Ore {
 class OreManager : public ObjDefManager {
 public:
 	OreManager(IGameDef *gamedef);
-	~OreManager() {}
+	virtual ~OreManager() {}
 
 	const char *getObjectTitle() const
 	{

src/mg_schematic.cpp

@@ -19,7 +19,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include <fstream>
 #include "mg_schematic.h"
+#include "gamedef.h"
 #include "mapgen.h"
+#include "emerge.h"
 #include "map.h"
 #include "mapblock.h"
 #include "log.h"
@@ -34,6 +36,28 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 SchematicManager::SchematicManager(IGameDef *gamedef) :
 	ObjDefManager(gamedef, OBJDEF_SCHEMATIC)
 {
+	m_gamedef = gamedef;
+}
+
+
+void SchematicManager::clear()
+{
+	EmergeManager *emerge = m_gamedef->getEmergeManager();
+
+	// Remove all dangling references in Decorations
+	DecorationManager *decomgr = emerge->decomgr;
+	for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
+		Decoration *deco = (Decoration *)decomgr->getRaw(i);
+
+		try {
+			DecoSchematic *dschem = dynamic_cast<DecoSchematic *>(deco);
+			if (dschem)
+				dschem->schematic = NULL;
+		} catch(std::bad_cast) {
+		}
+	}
+
+	ObjDefManager::clear();
 }
 
 

src/mg_schematic.h

@@ -29,6 +29,7 @@ class Mapgen;
 class MMVManip;
 class PseudoRandom;
 class NodeResolver;
+class IGameDef;
 
 /*
 	Minetest Schematic File Format
@@ -121,7 +122,9 @@ class Schematic : public ObjDef, public NodeResolver {
 class SchematicManager : public ObjDefManager {
 public:
 	SchematicManager(IGameDef *gamedef);
-	~SchematicManager() {}
+	virtual ~SchematicManager() {}
+
+	virtual void clear();
 
 	const char *getObjectTitle() const
 	{
@@ -132,6 +135,9 @@ class SchematicManager : public ObjDefManager {
 	{
 		return new Schematic;
 	}
+
+private:
+	IGameDef *m_gamedef;
 };
 
 void build_nnlist_and_update_ids(MapNode *nodes, u32 nodecount,