Program Listing for File Vertex.hpp

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#pragma once
#define GLM_ENABLE_EXPERIMENTAL
#include <glm/glm.hpp>
#include <glm/gtx/hash.hpp>

struct Vertex
{
  public:
    // this is public because to access the size of pos, norm, tex Cood.
    glm::vec3 position;
    glm::vec3 normal;
    glm::vec3 color;
    glm::vec2 texture_coords;

    Vertex()
    {
        this->position = glm::vec3(0);
        this->normal = glm::vec3(0);
        this->color = glm::vec3(0);
        this->texture_coords = glm::vec2(0);
    }

    Vertex(glm::vec3 pos, glm::vec3 normal, glm::vec3 color, glm::vec2 texture_coords)
    {
        this->position = pos;
        this->normal = normal;
        this->color = color;
        this->texture_coords = texture_coords;
    };

    glm::vec3 get_position() const { return position; }

    glm::vec3 get_normal() const { return normal; }

    glm::vec3 get_color() const { return color; }

    glm::vec2 get_tex_coors() const { return texture_coords; }

    bool operator==(const Vertex &other) const
    {
        return position == other.position && normal == other.normal && texture_coords == other.texture_coords
               && color == other.color;
    }
};

namespace std {

template<> struct hash<Vertex>
{
    size_t operator()(Vertex const &vert) const
    {
        size_t h1 = hash<glm::vec3>()(vert.position);
        size_t h2 = hash<glm::vec3>()(vert.normal);
        size_t h3 = hash<glm::vec2>()(vert.texture_coords);

        // combine hashed wonderfully :))))
        return ((h1 ^ (h2 << 1)) >> 1) ^ h3;
    }
};
}// namespace std