Octaves.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
namespace CeresEngine::inline Math {
 
    template<typename NoiseFunction, typename T = double> class Octaves {
    private:
        NoiseFunction noise;
        size_t octaves;
 
    public:
        template<typename... Args> explicit Octaves(const size_t octaves, Args... args) : noise(std::forward<Args>(args)...), octaves(octaves) {}
 
    public:
        template<typename TT> static void multiply(TT& a, TT b) { a *= b; }
 
        template<typename TT, typename... Ts> static void multiply(TT& a, Ts&... as, TT b) {
            a *= b;
            multiply(as..., b);
        }
 
        template<typename... Ts> T operator()(Ts... vs) const {
            double result = 0.0;
            double amp = 1.0;
 
            for(size_t i = 0; i < octaves; ++i) {
                result += noise(vs...) * amp;
                multiply<Ts...>(vs..., 2.0);
                amp *= 0.5;
            }
 
            return result;
        }
    };
 
} // namespace CeresEngine::inline Math