+Mapgen::Mapgen()
+{
+ generating = false;
+ id = -1;
+ seed = 0;
+ water_level = 0;
+ flags = 0;
+
+ vm = NULL;
+ ndef = NULL;
+ heightmap = NULL;
+ biomemap = NULL;
+}
+
+
+Mapgen::Mapgen(int mapgenid, MapgenParams *params, EmergeManager *emerge) :
+ gennotify(emerge->gen_notify_on, &emerge->gen_notify_on_deco_ids)
+{
+ generating = false;
+ id = mapgenid;
+ seed = (int)params->seed;
+ water_level = params->water_level;
+ flags = params->flags;
+ csize = v3s16(1, 1, 1) * (params->chunksize * MAP_BLOCKSIZE);
+
+ vm = NULL;
+ ndef = NULL;
+ heightmap = NULL;
+ biomemap = NULL;
+}
+
+
+Mapgen::~Mapgen()
+{
+}
+
+
+u32 Mapgen::getBlockSeed(v3s16 p, int seed)
+{
+ return (u32)seed +
+ p.Z * 38134234 +
+ p.Y * 42123 +
+ p.X * 23;
+}
+
+
+u32 Mapgen::getBlockSeed2(v3s16 p, int seed)
+{
+ return noise3d(p.X, p.Y, p.Z, seed);
+}
+
+
+// Returns Y one under area minimum if not found
+s16 Mapgen::findGroundLevelFull(v2s16 p2d)
+{
+ v3s16 em = vm->m_area.getExtent();
+ s16 y_nodes_max = vm->m_area.MaxEdge.Y;
+ s16 y_nodes_min = vm->m_area.MinEdge.Y;
+ u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
+ s16 y;
+
+ for (y = y_nodes_max; y >= y_nodes_min; y--) {
+ MapNode &n = vm->m_data[i];
+ if (ndef->get(n).walkable)
+ break;
+
+ vm->m_area.add_y(em, i, -1);
+ }
+ return (y >= y_nodes_min) ? y : y_nodes_min - 1;
+}
+
+
+s16 Mapgen::findGroundLevel(v2s16 p2d, s16 ymin, s16 ymax)
+{
+ v3s16 em = vm->m_area.getExtent();
+ u32 i = vm->m_area.index(p2d.X, ymax, p2d.Y);
+ s16 y;
+
+ for (y = ymax; y >= ymin; y--) {
+ MapNode &n = vm->m_data[i];
+ if (ndef->get(n).walkable)
+ break;
+
+ vm->m_area.add_y(em, i, -1);
+ }
+ return y;
+}
+