mpri-graphics-project/common_structures.hpp
2018-01-27 16:39:08 +01:00

37 lines
896 B
C++

/**
* Defines a few widely used, widely spread structures. Imported pervasively.
**/
#include <functional> // Hash
struct Point {
Point(double x, double y, double z) : x(x), y(y), z(z) {}
double x, y, z;
};
struct Face {
Face(int v0, int v1, int v2) {
vert[0] = v0;
vert[1] = v1;
vert[2] = v2;
}
int vert[3];
int operator[](unsigned i) const {
return vert[i % 3]; // dodge errors
}
};
namespace std {
template<> struct hash<Face>
{
typedef Face argument_type;
typedef std::size_t result_type;
result_type operator()(argument_type const& s) const noexcept
{
result_type const h1 ( std::hash<int>{}(s[0]) );
result_type const h2 ( std::hash<int>{}(s[1]) );
result_type const h3 ( std::hash<int>{}(s[2]) );
return h1 ^ h2 ^ h3;
}
};
}