#include "HeightMapTerrainNode.h"

#define WORLD_HEIGHT 1024

HeightMapTerrainNode::HeightMapTerrainNode(wstring name, wstring heightMap, wstring seed, float waterHeight, int widthX, int widthZ, int cellSizeX, int cellSizeZ) : TerrainNode(name, seed, waterHeight, widthX, widthZ, cellSizeX, cellSizeZ)
{
	_heightMap = heightMap;
	// Try to load the height map otherwise fail and set the error bool
	if (!LoadHeightMap(_heightMap))
	{
		_initError = true;
	}
}

bool HeightMapTerrainNode::LoadHeightMap(wstring heightMapFilename)
{
	unsigned int mapSize = _gridCols * _gridRows;
	USHORT* rawFileValues = new USHORT[mapSize];

	std::ifstream inputHeightMap;
	inputHeightMap.open(heightMapFilename.c_str(), std::ios_base::binary);
	if (!inputHeightMap)
	{
		return false;
	}

	inputHeightMap.read((char*)rawFileValues, mapSize * 2);
	inputHeightMap.close();

	// Normalise BYTE values to the range 0.0f - 1.0f;
	for (unsigned int i = 0; i < mapSize; i++)
	{
		_heightValues.push_back((float)rawFileValues[i] / 65536);
	}
	delete[] rawFileValues;
	return true;
}