$#include "TerrainPatch.h"

/// Individually rendered part of a heightmap terrain.
class TerrainPatch : public Drawable
{
public:
    /// Set owner terrain.
    void SetOwner(Terrain* terrain);
    /// Set neighbor patches.
    void SetNeighbors(TerrainPatch* north, TerrainPatch* south, TerrainPatch* west, TerrainPatch* east);
    /// Set material.
    void SetMaterial(Material* material);
    /// Set local-space bounding box.
    void SetBoundingBox(const BoundingBox& box);
    /// Set patch coordinates.
    void SetCoordinates(const IntVector2& coordinates);
    /// Set vertical offset for occlusion geometry. Should be negative.
    void SetOcclusionOffset(float offset);
    /// Reset to LOD level 0.
    void ResetLod();
    
    /// Return visible geometry.
    Geometry* GetGeometry() const;
    /// Return max LOD geometry.
    Geometry* GetMaxLodGeometry() const;
    /// Return min LOD geometry.
    Geometry* GetMinLodGeometry() const;
    /// Return vertex buffer.
    VertexBuffer* GetVertexBuffer() const;
    /// Return owner terrain.
    Terrain* GetOwner() const;
    /// Return north neighbor patch.
    TerrainPatch* GetNorthPatch() const { return north_; }
    /// Return south neighbor patch.
    TerrainPatch* GetSouthPatch() const { return south_; }
    /// Return west neighbor patch.
    TerrainPatch* GetWestPatch() const { return west_; }
    /// Return east neighbor patch.
    TerrainPatch* GetEastPatch() const { return east_; }
    /// Return local-space bounding box.
    const BoundingBox& GetBoundingBox() const { return boundingBox_; }
    /// Return patch coordinates.
    const IntVector2& GetCoordinates() const { return coordinates_; }
    /// Return current LOD level.
    unsigned GetLodLevel() const { return lodLevel_; }
    /// Return vertical offset for occlusion geometry..
    float GetOcclusionOffset() const { return occlusionOffset_; }
    float GetOcclusionOffset() const;
};