cube-game-plus-plus/common/world/HighMap.h

#ifndef HIGHMAP_H
#define HIGHMAP_H

#include "gaming-core/utils/Random.h"

template<int W, int H>
class HighMap {
public:

    HighMap() {
        Random r(0);
        for(int x = 0; x < W; x++) {
            for(int y = 0; y < H; y++) {
                data[x][y] = r.nextFloat();
            }
        }
        smooth();
        smooth();
        smooth();
        smooth();
    }

    void smooth() {
        float oldNoice[W][H];
        for(int x = 0; x < W; x++) {
            for(int y = 0; y < H; y++) {
                oldNoice[x][y] = data[x][y];
            }
        }
        for(int x = 0; x < W; x++) {
            for(int y = 0; y < H; y++) {
                float sum = 0.0f;
                for(int mx = -1; mx <= 1; mx++) {
                    for(int my = -1; my <= 1; my++) {
                        sum += oldNoice[(x + mx + W) % W][(y + my + H) % H];
                    }
                }
                data[x][y] = sum / 9.0f;
            }
        }
    }

    int getHeight(int x, int y, int max) const {
        return (data[x][y] * max);
    }

private:
    float data[W][H];
};

#endif