triangle.hpp

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#pragma once
 
#include <array>
#include "../util/color.hpp"
#include "../types/vector3.hpp"
#include "vertex.hpp"
#include "rectangle.hpp"
 
namespace cangine {
 
struct Triangle {
    std::array<Vertex, 3> vertices; 
 
    constexpr Triangle(const Vertex& v1, const Vertex& v2, const Vertex& v3) noexcept
        : vertices({v1, v2, v3}) {}
};
 
inline Triangle makeTriangle(const Vector3& a, const Vector3& b, const Vector3& c, const Color& color) noexcept {
    return Triangle(
        Vertex(a, color),
        Vertex(b, color),
        Vertex(c, color)
    );
}
 
inline std::array<Triangle, 2> rectToTriangle(const Rectangle& r) noexcept {
    Vector3 A = r.pos;
    Vector3 B(r.pos.x + r.width, r.pos.y, r.pos.z);
    Vector3 C(B.x, r.pos.y + r.height, r.pos.z);
    Vector3 D(r.pos.x, C.y, r.pos.z);
 
    return {
        makeTriangle(A, B, C, r.color),
        makeTriangle(A, C, D, r.color)
    };
}
 
}