#pragma once
#include "DirectXFramework.h"
#include <vector>
#include <numeric>
#include <random>
#include "SharedMethods.h"
#include "TerrainNode.h"

class PerlinTerrainNode : public TerrainNode
{
public:
	PerlinTerrainNode(wstring name, wstring seed, float offsetX, float offsetY, float chunkSize, int layers, int widthX = 1023, int widthZ = 1023, float waterHeight = 150.0f, int cellSizeX = 10, int cellSizeZ = 10);

private:
	vector<int> p;
	float _offsetX;
	float _offsetY;
	float _chunkSize;
	int _layers;

	float Fade(float t);
	float Grad(int hash, float x, float y);

	bool GeneratePerlinHeights();
	float GetPerlinValueAt(float x, float y, int octaves, float persistance);
	float GetNoiseValueAt(float x, float y);
	void GeneratePerlinValues();
};