the whole game

src/world/level/levelgen/feature/TreeFeature.h

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+#ifndef NET_MINECRAFT_WORLD_LEVEL_LEVELGEN_FEATURE__TreeFeature_H__
+#define NET_MINECRAFT_WORLD_LEVEL_LEVELGEN_FEATURE__TreeFeature_H__
+
+//package net.minecraft.world.level.levelgen.feature;
+
+#include "Feature.h"
+
+#include "../../../../util/Random.h"
+#include "../../Level.h"
+
+#include "../../tile/TreeTile.h"
+
+class TreeFeature: public Feature
+{
+	typedef Feature super;
+public:
+	TreeFeature(bool doUpdate, int trunkType = TreeTile::NORMAL_TRUNK)
+	:	super(doUpdate),
+		trunkType(trunkType)
+	{
+	}
+
+	bool place(Level* level, Random* random, int x, int y, int z) {
+        int treeHeight = random->nextInt(3) + 4;
+
+        bool free = true;
+        if (y < 1 || y + treeHeight + 1 > Level::DEPTH) return false;
+
+        for (int yy = y; yy <= y + 1 + treeHeight; yy++) {
+            int r = 1;
+            if (yy == y) r = 0;
+            if (yy >= y + 1 + treeHeight - 2) r = 2;
+            for (int xx = x - r; xx <= x + r && free; xx++) {
+                for (int zz = z - r; zz <= z + r && free; zz++) {
+                    if (yy >= 0 && yy < Level::DEPTH) {
+                        int tt = level->getTile(xx, yy, zz);
+                        if (tt != 0 && tt != ((Tile*)Tile::leaves)->id) free = false;
+                    } else {
+                        free = false;
+                    }
+                }
+            }
+        }
+
+        if (!free) return false;
+
+        int belowTile = level->getTile(x, y - 1, z);
+        if ((belowTile != ((Tile*)Tile::grass)->id && belowTile != Tile::dirt->id) || y >= Level::DEPTH - treeHeight - 1) return false;
+
+        placeBlock(level, x, y - 1, z, Tile::dirt->id);
+
+        for (int yy = y - 3 + treeHeight; yy <= y + treeHeight; yy++) {
+            int yo = yy - (y + treeHeight);
+            int offs = 1 - yo / 2;
+            for (int xx = x - offs; xx <= x + offs; xx++) {
+                int xo = xx - (x);
+                for (int zz = z - offs; zz <= z + offs; zz++) {
+                    int zo = zz - (z);
+                    if (std::abs(xo) == offs && std::abs(zo) == offs && (random->nextInt(2) == 0 || yo == 0)) continue;
+                    if (!Tile::solid[level->getTile(xx, yy, zz)]) placeBlock(level, xx, yy, zz, ((Tile*)Tile::leaves)->id);
+                }
+            }
+        }
+        for (int hh = 0; hh < treeHeight; hh++) {
+            int t = level->getTile(x, y + hh, z);
+            if (t == 0 || t == ((Tile*)Tile::leaves)->id) placeBlock(level, x, y + hh, z, Tile::treeTrunk->id, trunkType);
+        }
+        return true;
+    }
+private:
+	int trunkType;
+};
+
+#endif /*NET_MINECRAFT_WORLD_LEVEL_LEVELGEN_FEATURE__TreeFeature_H__*/