- unsigned char Perm(size_t idx) const noexcept;
- unsigned char Perm12(size_t idx) const noexcept;
- const glm::vec3 &Grad(unsigned char idx) const noexcept;
+ int Perm(int idx) const noexcept;
+ int Perm12(int idx) const noexcept;
+ const glm::vec3 &Grad(int idx) const noexcept;