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vec3.h
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#ifndef VEC3H
#define VEC3H
#include <math.h>
#include <stdlib.h>
#include <iostream>
#include "precision_types.h"
class vec3 {
public:
__host__ __device__ vec3() {}
__host__ __device__ vec3(real_t e0, real_t e1, real_t e2) { e[0] = e0; e[1] = e1; e[2] = e2; }
__host__ __device__ inline real_t x() const { return e[0]; }
__host__ __device__ inline real_t y() const { return e[1]; }
__host__ __device__ inline real_t z() const { return e[2]; }
__host__ __device__ inline real_t r() const { return e[0]; }
__host__ __device__ inline real_t g() const { return e[1]; }
__host__ __device__ inline real_t b() const { return e[2]; }
__host__ __device__ inline const vec3& operator+() const { return *this; }
__host__ __device__ inline vec3 operator-() const { return vec3(-e[0], -e[1], -e[2]); }
__host__ __device__ inline real_t operator[](int i) const { return e[i]; }
__host__ __device__ inline real_t& operator[](int i) { return e[i]; };
__host__ __device__ inline vec3& operator+=(const vec3 &v2);
__host__ __device__ inline vec3& operator-=(const vec3 &v2);
__host__ __device__ inline vec3& operator*=(const vec3 &v2);
__host__ __device__ inline vec3& operator/=(const vec3 &v2);
__host__ __device__ inline vec3& operator*=(const real_t t);
__host__ __device__ inline vec3& operator/=(const real_t t);
__host__ __device__ inline real_t length() const { return sqrt(e[0]*e[0] + e[1]*e[1] + e[2]*e[2]); }
__host__ __device__ inline real_t squared_length() const { return e[0]*e[0] + e[1]*e[1] + e[2]*e[2]; }
__host__ __device__ inline void make_unit_vector();
real_t e[3];
};
inline std::istream& operator>>(std::istream &is, vec3 &t) {
is >> t.e[0] >> t.e[1] >> t.e[2];
return is;
}
inline std::ostream& operator<<(std::ostream &os, const vec3 &t) {
os << t.e[0] << " " << t.e[1] << " " << t.e[2];
return os;
}
__host__ __device__ inline void vec3::make_unit_vector() {
#ifdef USE_FP16
real_t k = real_t::rsqrt(e[0]*e[0] + e[1]*e[1] + e[2]*e[2]);
#else
real_t k = 1.0 / sqrt(e[0]*e[0] + e[1]*e[1] + e[2]*e[2]);
#endif
e[0] *= k; e[1] *= k; e[2] *= k;
}
__host__ __device__ inline vec3 operator+(const vec3 &v1, const vec3 &v2) {
return vec3(v1.e[0] + v2.e[0], v1.e[1] + v2.e[1], v1.e[2] + v2.e[2]);
}
__host__ __device__ inline vec3 operator-(const vec3 &v1, const vec3 &v2) {
return vec3(v1.e[0] - v2.e[0], v1.e[1] - v2.e[1], v1.e[2] - v2.e[2]);
}
__host__ __device__ inline vec3 operator*(const vec3 &v1, const vec3 &v2) {
return vec3(v1.e[0] * v2.e[0], v1.e[1] * v2.e[1], v1.e[2] * v2.e[2]);
}
__host__ __device__ inline vec3 operator/(const vec3 &v1, const vec3 &v2) {
return vec3(v1.e[0] / v2.e[0], v1.e[1] / v2.e[1], v1.e[2] / v2.e[2]);
}
__host__ __device__ inline vec3 operator*(real_t t, const vec3 &v) {
return vec3(t*v.e[0], t*v.e[1], t*v.e[2]);
}
__host__ __device__ inline vec3 operator/(vec3 v, real_t t) {
return vec3(v.e[0]/t, v.e[1]/t, v.e[2]/t);
}
__host__ __device__ inline vec3 operator*(const vec3 &v, real_t t) {
return vec3(t*v.e[0], t*v.e[1], t*v.e[2]);
}
__host__ __device__ inline real_t dot(const vec3 &v1, const vec3 &v2) {
return v1.e[0] *v2.e[0] + v1.e[1] *v2.e[1] + v1.e[2] *v2.e[2];
}
__host__ __device__ inline vec3 cross(const vec3 &v1, const vec3 &v2) {
return vec3( (v1.e[1]*v2.e[2] - v1.e[2]*v2.e[1]),
(-(v1.e[0]*v2.e[2] - v1.e[2]*v2.e[0])),
(v1.e[0]*v2.e[1] - v1.e[1]*v2.e[0]));
}
__host__ __device__ inline vec3& vec3::operator+=(const vec3 &v){
e[0] += v.e[0];
e[1] += v.e[1];
e[2] += v.e[2];
return *this;
}
__host__ __device__ inline vec3& vec3::operator*=(const vec3 &v){
e[0] *= v.e[0];
e[1] *= v.e[1];
e[2] *= v.e[2];
return *this;
}
__host__ __device__ inline vec3& vec3::operator/=(const vec3 &v){
e[0] /= v.e[0];
e[1] /= v.e[1];
e[2] /= v.e[2];
return *this;
}
__host__ __device__ inline vec3& vec3::operator-=(const vec3& v) {
e[0] -= v.e[0];
e[1] -= v.e[1];
e[2] -= v.e[2];
return *this;
}
__host__ __device__ inline vec3& vec3::operator*=(const real_t t) {
e[0] *= t;
e[1] *= t;
e[2] *= t;
return *this;
}
__host__ __device__ inline vec3& vec3::operator/=(const real_t t) {
real_t k = 1.0/t;
e[0] *= k;
e[1] *= k;
e[2] *= k;
return *this;
}
__host__ __device__ inline vec3 unit_vector(vec3 v) {
return v / v.length();
}
#endif