public:
// seed should be non-zero
- explicit GaloisLFSR(std::uint64_t seed);
+ explicit GaloisLFSR(std::uint64_t seed) noexcept;
// get the next bit
- bool operator ()();
+ bool operator ()() noexcept;
template<class T>
- void operator ()(T &out) {
+ void operator ()(T &out) noexcept {
constexpr int num_bits =
std::numeric_limits<T>::digits +
std::numeric_limits<T>::is_signed;
};
+
/// (3D only) adaptation of Stefan Gustavson's SimplexNoise java class
class SimplexNoise {
public:
- explicit SimplexNoise(unsigned int seed);
+ explicit SimplexNoise(unsigned int seed) noexcept;
- float operator ()(const glm::vec3 &) const;
+ float operator ()(const glm::vec3 &) const noexcept;
private:
- unsigned char Perm(size_t idx) const;
- const glm::vec3 &Grad(size_t idx) const;
+ unsigned char Perm(size_t idx) const noexcept;
+ const glm::vec3 &Grad(size_t idx) const noexcept;
private:
unsigned char perm[512];
class WorleyNoise {
public:
- explicit WorleyNoise(unsigned int seed);
+ explicit WorleyNoise(unsigned int seed) noexcept;
- float operator ()(const glm::vec3 &) const;
+ float operator ()(const glm::vec3 &) const noexcept;
private:
const unsigned int seed;
};
+
+template<class Noise>
+float OctaveNoise(
+ const Noise &noise,
+ const glm::vec3 &in,
+ int num,
+ float persistence,
+ float frequency = 1.0f,
+ float amplitude = 1.0f,
+ float growth = 2.0f
+) {
+ float total = 0.0f;
+ float max = 0.0f;
+ for (int i = 0; i < num; ++i) {
+ total += noise(in * frequency) * amplitude;
+ max += amplitude;
+ amplitude *= persistence;
+ frequency *= growth;
+ }
+
+ return total / max;
+}
+
}
#endif