first commit

Minecraft.World/BirchFeature.cpp

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+#include "stdafx.h"
+#include "net.minecraft.world.level.h"
+#include "BirchFeature.h"
+#include "net.minecraft.world.level.tile.h"
+
+BirchFeature::BirchFeature(bool doUpdate) : Feature(doUpdate)
+{
+}
+
+bool BirchFeature::place(Level *level, Random *random, int x, int y, int z)
+{
+    int treeHeight = random->nextInt(3) + 5;
+
+    bool free = true;
+    if (y < 1 || y + treeHeight + 1 > Level::maxBuildHeight) 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::maxBuildHeight)
+				{
+                    int tt = level->getTile(xx, yy, zz);
+                    if (tt != 0 && tt != Tile::leaves_Id) free = false;
+                }
+				else
+				{
+                    free = false;
+                }
+            }
+        }
+    }
+
+    if (!free) return false;
+
+    int belowTile = level->getTile(x, y - 1, z);
+    if ((belowTile != Tile::grass_Id && belowTile != Tile::dirt_Id) || y >= Level::maxBuildHeight - treeHeight - 1) return false;
+
+	// 4J Stu Added to stop tree features generating areas previously place by game rule generation
+	if(app.getLevelGenerationOptions() != NULL)
+	{
+		LevelGenerationOptions *levelGenOptions = app.getLevelGenerationOptions();
+		int radius = 3;
+		bool intersects = levelGenOptions->checkIntersects(x - radius, y - 1, z - radius, x + radius, y + treeHeight, z + radius);
+		if(intersects)
+		{
+			//app.DebugPrintf("Skipping reeds feature generation as it overlaps a game rule structure\n");
+			return false;
+		}
+	}
+
+    level->setTileNoUpdate(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 (abs(xo) == offs && abs(zo) == offs && (random->nextInt(2) == 0 || yo == 0)) continue;
+                if (!Tile::solid[level->getTile(xx, yy, zz)]) placeBlock(level, xx, yy, zz, Tile::leaves_Id, LeafTile::BIRCH_LEAF);
+            }
+        }
+    }
+    for (int hh = 0; hh < treeHeight; hh++)
+	{
+        int t = level->getTile(x, y + hh, z);
+        if (t == 0 || t == Tile::leaves_Id) placeBlock(level, x, y + hh, z, Tile::treeTrunk_Id, TreeTile::BIRCH_TRUNK);
+    }
+    return true;
+
+}