godot_voxel/voxel_terrain.h

#ifndef VOXEL_TERRAIN_H
#define VOXEL_TERRAIN_H

#include <scene/main/node.h>
#include "voxel_map.h"
#include "voxel_mesher.h"
#include "voxel_provider.h"

// TODO
//#define VOXEL_TERRAIN_PROFILING

// Infinite static terrain made of voxels.
// It is loaded around VoxelTerrainStreamers.
class VoxelTerrain : public Node /*, public IVoxelMapObserver*/ {
	GDCLASS(VoxelTerrain, Node)
public:
	VoxelTerrain();

	void set_provider(Ref<VoxelProvider> provider);
	Ref<VoxelProvider> get_provider();

	void force_load_blocks(Vector3i center, Vector3i extents);
	int get_block_update_count();
	//void clear_update_queue();

	void make_block_dirty(Vector3i bpos);
	void make_blocks_dirty(Vector3i min, Vector3i size);

	void set_generate_collisions(bool enabled);
	bool get_generate_collisions() { return _generate_collisions; }

	void set_viewer_path(NodePath path);
	NodePath get_viewer_path();

	Ref<VoxelMesher> get_mesher() { return _mesher; }
	Ref<VoxelMap> get_map() { return _map; }
	Ref<VoxelLibrary> get_voxel_library();

protected:
	void _notification(int p_what);

private:
	void _process();

	void update_blocks();
	void update_block_mesh(Vector3i block_pos);

	Spatial * get_viewer(NodePath path);

	// Observer events
	//void block_removed(VoxelBlock & block);

	static void _bind_methods();

	// Convenience
	Vector3 _voxel_to_block_binding(Vector3 pos) { return Vector3i(VoxelMap::voxel_to_block(pos)).to_vec3(); }
	Vector3 _block_to_voxel_binding(Vector3 pos) { return Vector3i(VoxelMap::block_to_voxel(pos)).to_vec3(); }
	void _force_load_blocks_binding(Vector3 center, Vector3 extents) { force_load_blocks(center, extents); }
	void _make_block_dirty_binding(Vector3 bpos) { make_block_dirty(bpos); }
	void _make_blocks_dirty_binding(Vector3 min, Vector3 size) { make_blocks_dirty(min, size); }

	Variant _raycast_binding(Vector3 origin, Vector3 direction, real_t max_distance);

//	void set_voxel(Vector3 pos, int value, int c);
//	int get_voxel(Vector3 pos, int c);

private:
	// Parameters
	int _min_y; // In blocks, not voxels
	int _max_y;

	// Voxel storage
	Ref<VoxelMap> _map;

	// TODO Terrains only need to handle the visible portion of voxels, which reduces the bounds blocks to handle.
	// Therefore, could a simple grid be better to use than a hashmap?

	Vector<Vector3i> _block_update_queue;
	HashMap<Vector3i, bool, Vector3iHasher> _dirty_blocks; // only the key is relevant

	Ref<VoxelMesher> _mesher;
	Ref<VoxelProvider> _provider;

	NodePath _viewer_path;

	bool _generate_collisions;

};

#endif // VOXEL_TERRAIN_H