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https://github.com/harfang3d/harfang3d.git
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133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
// HARFANG(R) Copyright (C) 2021 Emmanuel Julien, NWNC HARFANG. Released under GPL/LGPL/Commercial Licence, see licence.txt for details.
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#pragma once
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#include "foundation/rotation_order.h"
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namespace hg {
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struct Vec3;
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struct Mat3;
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/// Quaternion
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struct Quaternion {
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static const Quaternion Identity;
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Quaternion() = default;
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Quaternion(const Quaternion &q) = default;
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Quaternion(float _x, float _y, float _z, float _w) : x(_x), y(_y), z(_z), w(_w) {}
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float x, y, z, w;
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Quaternion &operator+=(const Quaternion &b) {
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x += b.x;
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y += b.y;
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z += b.z;
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w += b.w;
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return *this;
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}
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Quaternion &operator+=(float k) {
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x += k;
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y += k;
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z += k;
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w += k;
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return *this;
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}
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Quaternion &operator-=(const Quaternion &b) {
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x -= b.x;
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y -= b.y;
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z -= b.z;
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w -= b.w;
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return *this;
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}
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Quaternion &operator-=(float k) {
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x -= k;
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y -= k;
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z -= k;
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w -= k;
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return *this;
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}
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Quaternion &operator*=(const Quaternion &b) {
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Quaternion a = *this;
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w = a.w * b.w - (a.x * b.x + a.y * b.y + a.z * b.z);
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x = a.w * b.x + b.w * a.x + a.y * b.z - a.z * b.y;
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y = a.w * b.y + b.w * a.y + a.z * b.x - a.x * b.z;
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z = a.w * b.z + b.w * a.z + a.x * b.y - a.y * b.x;
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return *this;
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}
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Quaternion &operator*=(float k) {
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x *= k;
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y *= k;
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z *= k;
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w *= k;
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return *this;
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}
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Quaternion &operator/=(float k) {
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k = 1.f / k;
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x *= k;
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y *= k;
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z *= k;
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w *= k;
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return *this;
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}
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};
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inline bool operator==(const Quaternion &a, const Quaternion &b) { return a.x == b.x && a.y == b.y && a.z == b.z && a.w == b.w; }
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inline bool operator!=(const Quaternion &a, const Quaternion &b) { return a.x != b.x || a.y != b.y || a.z != b.z || a.w != b.w; }
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inline float Dot(const Quaternion &a, const Quaternion &b) { return a.x * b.x + a.y * b.y + a.z * b.z + a.w * b.w; }
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inline Quaternion operator+(const Quaternion &a, const Quaternion &b) { return {a.x + b.x, a.y + b.y, a.z + b.z, a.w + b.w}; }
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inline Quaternion operator+(const Quaternion &q, float v) { return {q.x + v, q.y + v, q.z + v, q.w + v}; }
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inline Quaternion operator-(const Quaternion &a, const Quaternion &b) { return {a.x - b.x, a.y - b.y, a.z - b.z, a.w - b.w}; }
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inline Quaternion operator-(const Quaternion &q, float v) { return {q.x - v, q.y - v, q.z - v, q.w - v}; }
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inline Quaternion operator*(const Quaternion &a, const Quaternion &b) {
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return {
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a.w * b.x + b.w * a.x + a.y * b.z - a.z * b.y,
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a.w * b.y + b.w * a.y + a.z * b.x - a.x * b.z,
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a.w * b.z + b.w * a.z + a.x * b.y - a.y * b.x,
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a.w * b.w - (a.x * b.x + a.y * b.y + a.z * b.z)};
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}
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inline Quaternion operator*(const Quaternion &q, float v) { return {q.x * v, q.y * v, q.z * v, q.w * v}; }
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inline Quaternion operator/(const Quaternion &q, float v) { return {q.x / v, q.y / v, q.z / v, q.w / v}; }
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/// Normalize quaternion.
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Quaternion Normalize(const Quaternion &q);
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/// Conjugate
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Quaternion Conjugate(const Quaternion &q);
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/// Inverse quaternion.
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Quaternion Inverse(const Quaternion &q);
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float Len(const Quaternion &q);
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float Len2(const Quaternion &q);
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/// Distance to quaternion.
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float Dist(const Quaternion &a, const Quaternion &b);
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/// Slerp.
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Quaternion Slerp(const Quaternion &a, const Quaternion &b, float t);
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/// From Euler angle triplet.
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Quaternion QuaternionFromEuler(float x, float y, float z, RotationOrder = RO_Default);
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Quaternion QuaternionFromEuler(const Vec3 &euler, RotationOrder = RO_Default);
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/// Get an orientation from a 'look at' vector (look_at = to - from).
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Quaternion QuaternionLookAt(const Vec3 &at);
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/// From matrix3.
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Quaternion QuaternionFromMatrix3(const Mat3 &m);
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/// From axis-angle.
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Quaternion QuaternionFromAxisAngle(float angle, const Vec3 &axis);
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/// To rotation matrix.
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Mat3 ToMatrix3(const Quaternion &q);
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/// To Euler angle triplet.
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Vec3 ToEuler(const Quaternion &q, RotationOrder = RO_Default);
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} // namespace hg
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