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

#ifndef HIGHMAP_H
#define HIGHMAP_H

#include "common/utils/Types.h"
#include "common/utils/Random.h"

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

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

    void smooth() {
        float oldNoice[W][H];
        for(uint x = 0; x < W; x++) {
            for(uint y = 0; y < H; y++) {
                oldNoice[x][y] = data[x][y];
            }
        }
        for(uint x = 0; x < W; x++) {
            for(uint y = 0; y < H; y++) {
                float sum = 0.0f;
                for(uint mx = 0; mx <= 2; mx++) {
                    for(uint my = 0; my <= 2; my++) {
                        sum += oldNoice[(x + mx - 1) % W][(y + my - 1) % H];
                    }
                }
                data[x][y] = sum / 9.0f;
            }
        }
    }

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

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

#endif