Ore: Add Vein ore type

src/mg_ore.cpp

@@ -27,10 +27,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 const char *OreManager::ELEMENT_TITLE = "ore";
 
 FlagDesc flagdesc_ore[] = {
-	{"absheight",            OREFLAG_ABSHEIGHT},
-	{"scatter_noisedensity", OREFLAG_DENSITY},
-	{"claylike_nodeisnt",    OREFLAG_NODEISNT},
-	{NULL,                   0}
+	{"absheight", OREFLAG_ABSHEIGHT},
+	{NULL,        0}
 };
 
 
@@ -217,7 +215,7 @@ void OreBlob::generate(ManualMapVoxelManipulator *vm, int seed, u32 blockseed,
 	int volume = (nmax.X - nmin.X + 1) *
 				 (nmax.Y - nmin.Y + 1) *
 				 (nmax.Z - nmin.Z + 1);
-	int csize     = clust_size;
+	int csize  = clust_size;
 	int nblobs = volume / clust_scarcity;
 
 	if (!noise)
@@ -261,3 +259,55 @@ void OreBlob::generate(ManualMapVoxelManipulator *vm, int seed, u32 blockseed,
 		}
 	}
 }
+
+
+///////////////////////////////////////////////////////////////////////////////
+
+OreVein::~OreVein()
+{
+	delete noise2;
+}
+
+
+void OreVein::generate(ManualMapVoxelManipulator *vm, int seed, u32 blockseed,
+	v3s16 nmin, v3s16 nmax)
+{
+	PseudoRandom pr(blockseed + 520);
+	MapNode n_ore(c_ore, 0, ore_param2);
+
+	if (!noise) {
+		int sx = nmax.X - nmin.X + 1;
+		int sy = nmax.Y - nmin.Y + 1;
+		int sz = nmax.Z - nmin.Z + 1;
+		noise  = new Noise(&np, seed, sx, sy, sz);
+		noise2 = new Noise(&np, seed + 436, sx, sy, sz);
+	}
+	bool noise_generated = false;
+
+	size_t index = 0;
+	for (int z = nmin.Z; z <= nmax.Z; z++)
+	for (int y = nmin.Y; y <= nmax.Y; y++)
+	for (int x = nmin.X; x <= nmax.X; x++, index++) {
+		u32 i = vm->m_area.index(x, y, z);
+		if (!vm->m_area.contains(i))
+			continue;
+		if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+			continue;
+
+		// Same lazy generation optimization as in OreBlob
+		if (!noise_generated) {
+			noise_generated = true;
+			noise->perlinMap3D(nmin.X, nmin.Y, nmin.Z);
+			noise2->perlinMap3D(nmin.X, nmin.Y, nmin.Z);
+		}
+
+		// randval ranges from -1..1
+		float randval   = (float)pr.next() / (PSEUDORANDOM_MAX / 2) - 1.f;
+		float noiseval  = contour(noise->result[index]);
+		float noiseval2 = contour(noise2->result[index]);
+		if (noiseval * noiseval2 + randval * random_factor < nthresh)
+			continue;
+
+		vm->m_data[i] = n_ore;
+	}
+}

src/mg_ore.h

@@ -32,14 +32,6 @@ class ManualMapVoxelManipulator;
 
 // Use absolute value of height to determine ore placement
 #define OREFLAG_ABSHEIGHT 0x01
-
-// Use 3d noise to get density of ore placement, instead of just the position
-#define OREFLAG_DENSITY   0x02 // not yet implemented
-
-// For claylike ore types, place ore if the number of surrounding
-// nodes isn't the specified node
-#define OREFLAG_NODEISNT  0x04 // not yet implemented
-
 #define OREFLAG_USE_NOISE 0x08
 
 #define ORE_RANGE_ACTUAL 1
@@ -50,6 +42,7 @@ enum OreType {
 	ORE_TYPE_SCATTER,
 	ORE_TYPE_SHEET,
 	ORE_TYPE_BLOB,
+	ORE_TYPE_VEIN,
 };
 
 extern FlagDesc flagdesc_ore[];
@@ -105,6 +98,19 @@ public:
 		u32 blockseed, v3s16 nmin, v3s16 nmax);
 };
 
+class OreVein : public Ore {
+public:
+	static const bool NEEDS_NOISE = true;
+
+	float random_factor;
+	Noise *noise2;
+
+	virtual ~OreVein();
+
+	virtual void generate(ManualMapVoxelManipulator *vm, int seed,
+		u32 blockseed, v3s16 nmin, v3s16 nmax);
+};
+
 class OreManager : public GenElementManager {
 public:
 	static const char *ELEMENT_TITLE;
@@ -122,6 +128,8 @@ public:
 			return new OreSheet;
 		case ORE_TYPE_BLOB:
 			return new OreBlob;
+		case ORE_TYPE_VEIN:
+			return new OreVein;
 		default:
 			return NULL;
 		}

src/script/lua_api/l_mapgen.cpp

@@ -68,9 +68,10 @@ struct EnumString ModApiMapgen::es_MapgenObject[] =
 
 struct EnumString ModApiMapgen::es_OreType[] =
 {
-	{ORE_TYPE_SCATTER,  "scatter"},
-	{ORE_TYPE_SHEET,    "sheet"},
-	{ORE_TYPE_BLOB,     "blob"},
+	{ORE_TYPE_SCATTER, "scatter"},
+	{ORE_TYPE_SHEET,   "sheet"},
+	{ORE_TYPE_BLOB,    "blob"},
+	{ORE_TYPE_VEIN,    "vein"},
 	{0, NULL},
 };
 
@@ -680,6 +681,12 @@ int ModApiMapgen::l_register_ore(lua_State *L)
 	}
 	lua_pop(L, 1);
 
+	if (oretype == ORE_TYPE_VEIN) {
+		OreVein *orevein = (OreVein *)ore;
+		orevein->random_factor = getfloatfield_default(L, index,
+			"random_factor", 1.f);
+	}
+
 	u32 id = oremgr->add(ore);
 	if (id == (u32)-1) {
 		delete ore;