All of our primitive data has to be represented as a set of vertices. Whether we are dealing with a triangle or a sprite on screen, or if it is a huge, complex model of a monster, it can all be broken down to this fundamental type. Let us take a look at a class that represents it:
enum class VertexAttribute{ Position, COUNT };
struct GL_Vertex {
GL_Vertex(const glm::vec3& l_pos): m_pos(l_pos) {}
glm::vec3 m_pos; // Attribute 1.
// ...
};
As you can see, it is only a simple struct that holds a 3D vector that represents a position. Later on, we might want to store other information about a vertex, such as texture coordinates, its color, and so on. These different pieces of information about a specific vertex are usually referred to as attributes. For convenience, we are also enumerating different attributes to make the rest of our code more clear.