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diff --git a/src/Generator.h b/src/Generator.h
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+#ifndef CC_MAP_GEN_H
+#define CC_MAP_GEN_H
+#include "ExtMath.h"
+#include "Vectors.h"
+/* Implements flatgrass map generator, and original classic vanilla map generation (with perlin noise)
+   Based on: https://github.com/ClassiCube/ClassiCube/wiki/Minecraft-Classic-map-generation-algorithm
+   Thanks to Jerralish for originally reverse engineering classic's algorithm, then preparing a high level overview of the algorithm.
+   Copyright 2014-2023 ClassiCube | Licensed under BSD-3
+*/
+
+/* Progress between 0 and 1 for the current step */
+extern volatile float Gen_CurrentProgress;
+/* Name of the current step being performed */
+extern volatile const char* Gen_CurrentState;
+extern int Gen_Seed;
+extern BlockRaw* Gen_Blocks;
+
+/* Starts generating a map using the Gen_Active generator */
+void Gen_Start(void);
+/* Checks whether the map generator has completed yet */
+cc_bool Gen_IsDone(void);
+
+
+struct MapGenerator {
+	cc_bool (*Prepare)(void);
+	void   (*Generate)(void);
+};
+
+extern const struct MapGenerator* Gen_Active;
+extern const struct MapGenerator FlatgrassGen;
+extern const struct MapGenerator NotchyGen;
+
+
+extern BlockRaw* Tree_Blocks;
+extern RNGState* Tree_Rnd;
+/* Appropriate buffer size to hold positions and blocks generated by the tree generator. */
+#define TREE_MAX_COUNT 96
+
+/* Whether a tree can actually be generated at the given coordinates. */
+cc_bool TreeGen_CanGrow(int treeX, int treeY, int treeZ, int treeHeight);
+/* Generates the blocks (and their positions in the world) that actually make up a tree. */
+/* Returns the number of blocks generated, which will be <= TREE_MAX_COUNT */
+int  TreeGen_Grow(int treeX, int treeY, int treeZ, int height, IVec3* coords, BlockRaw* blocks);
+#endif