FactoryCraft-Server/FactoryCraft/NoiseInterpolator.cpp

#include "NoiseInterpolator.h"
#include "Text.h"

using namespace Framework;

NoiseInterpolator::NoiseInterpolator(int seed, std::function<Noise* (int)> noiseSupplier, int width, int height)
	: Noise(),
	noiseSize(width, height),
	cache(10, [](int k) { return k; }, CacheCleanupStrategy::LONGEST_NOT_USED),
	noiseSupplier(noiseSupplier),
	seed(seed)
{}

double NoiseInterpolator::getRealNoise(double x, double y, double z)
{
	int ix = (int)ceil(x), iy = (int)ceil(y);
	int xOff = ix % noiseSize.x, yOff = iy % noiseSize.y;
	int xI = ix / noiseSize.x, yI = iy / noiseSize.y;
	if (ix < 0)
		xI--;
	if (iy < 0)
		yI--;
	int key = ((xI & 0xFFFF) << 16) | (yI & 0xFFFF);
	if (!cache.has(key))
		cache.put(key, RCPointer<Noise>::of(noiseSupplier(key + seed)));
	return cache.get(key)->getNoise((xOff + 1 - (ix - x)), (yOff + 1 - (iy - y)), z);
}

double NoiseInterpolator::getNoise(double x, double y, double z)
{
	const double weights[6] = { 0.32, 0.17, 0.09, 0.05, 0.03, 0.02 };
	double sum = 0;
	for (int xi = -5; xi <= 5; xi++)
	{
		for (int yi = -5; yi <= 5; yi++)
			sum += getRealNoise(x + xi, y + yi, z) * weights[abs(xi)] * weights[abs(yi)];
	}
	return sum;
}

int NoiseInterpolator::getSeed() const
{
	return seed;
}