mirror of
https://git.suyu.dev/suyu/suyu.git
synced 2024-11-25 22:57:22 +00:00
714 lines
21 KiB
C++
714 lines
21 KiB
C++
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
// Copyright 2014 Tony Wasserka
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above copyright
|
|
// notice, this list of conditions and the following disclaimer in the
|
|
// documentation and/or other materials provided with the distribution.
|
|
// * Neither the name of the owner nor the names of its contributors may
|
|
// be used to endorse or promote products derived from this software
|
|
// without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#pragma once
|
|
|
|
#include <cmath>
|
|
#include <type_traits>
|
|
|
|
namespace Math {
|
|
|
|
template <typename T>
|
|
class Vec2;
|
|
template <typename T>
|
|
class Vec3;
|
|
template <typename T>
|
|
class Vec4;
|
|
|
|
template <typename T>
|
|
static inline Vec2<T> MakeVec(const T& x, const T& y);
|
|
template <typename T>
|
|
static inline Vec3<T> MakeVec(const T& x, const T& y, const T& z);
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const T& x, const T& y, const T& z, const T& w);
|
|
|
|
template <typename T>
|
|
class Vec2 {
|
|
public:
|
|
T x;
|
|
T y;
|
|
|
|
T* AsArray() {
|
|
return &x;
|
|
}
|
|
|
|
Vec2() = default;
|
|
Vec2(const T& _x, const T& _y) : x(_x), y(_y) {}
|
|
|
|
template <typename T2>
|
|
Vec2<T2> Cast() const {
|
|
return Vec2<T2>((T2)x, (T2)y);
|
|
}
|
|
|
|
static Vec2 AssignToAll(const T& f) {
|
|
return Vec2<T>(f, f);
|
|
}
|
|
|
|
void Write(T a[2]) {
|
|
a[0] = x;
|
|
a[1] = y;
|
|
}
|
|
|
|
Vec2<decltype(T{} + T{})> operator+(const Vec2& other) const {
|
|
return MakeVec(x + other.x, y + other.y);
|
|
}
|
|
void operator+=(const Vec2& other) {
|
|
x += other.x;
|
|
y += other.y;
|
|
}
|
|
Vec2<decltype(T{} - T{})> operator-(const Vec2& other) const {
|
|
return MakeVec(x - other.x, y - other.y);
|
|
}
|
|
void operator-=(const Vec2& other) {
|
|
x -= other.x;
|
|
y -= other.y;
|
|
}
|
|
template <typename Q = T, class = typename std::enable_if<std::is_signed<Q>::value>::type>
|
|
Vec2<decltype(-T{})> operator-() const {
|
|
return MakeVec(-x, -y);
|
|
}
|
|
Vec2<decltype(T{} * T{})> operator*(const Vec2& other) const {
|
|
return MakeVec(x * other.x, y * other.y);
|
|
}
|
|
template <typename V>
|
|
Vec2<decltype(T{} * V{})> operator*(const V& f) const {
|
|
return MakeVec(x * f, y * f);
|
|
}
|
|
template <typename V>
|
|
void operator*=(const V& f) {
|
|
x *= f;
|
|
y *= f;
|
|
}
|
|
template <typename V>
|
|
Vec2<decltype(T{} / V{})> operator/(const V& f) const {
|
|
return MakeVec(x / f, y / f);
|
|
}
|
|
template <typename V>
|
|
void operator/=(const V& f) {
|
|
*this = *this / f;
|
|
}
|
|
|
|
T Length2() const {
|
|
return x * x + y * y;
|
|
}
|
|
|
|
// Only implemented for T=float
|
|
float Length() const;
|
|
void SetLength(const float l);
|
|
Vec2 WithLength(const float l) const;
|
|
float Distance2To(Vec2& other);
|
|
Vec2 Normalized() const;
|
|
float Normalize(); // returns the previous length, which is often useful
|
|
|
|
T& operator[](int i) // allow vector[1] = 3 (vector.y=3)
|
|
{
|
|
return *((&x) + i);
|
|
}
|
|
T operator[](const int i) const {
|
|
return *((&x) + i);
|
|
}
|
|
|
|
void SetZero() {
|
|
x = 0;
|
|
y = 0;
|
|
}
|
|
|
|
// Common aliases: UV (texel coordinates), ST (texture coordinates)
|
|
T& u() {
|
|
return x;
|
|
}
|
|
T& v() {
|
|
return y;
|
|
}
|
|
T& s() {
|
|
return x;
|
|
}
|
|
T& t() {
|
|
return y;
|
|
}
|
|
|
|
const T& u() const {
|
|
return x;
|
|
}
|
|
const T& v() const {
|
|
return y;
|
|
}
|
|
const T& s() const {
|
|
return x;
|
|
}
|
|
const T& t() const {
|
|
return y;
|
|
}
|
|
|
|
// swizzlers - create a subvector of specific components
|
|
const Vec2 yx() const {
|
|
return Vec2(y, x);
|
|
}
|
|
const Vec2 vu() const {
|
|
return Vec2(y, x);
|
|
}
|
|
const Vec2 ts() const {
|
|
return Vec2(y, x);
|
|
}
|
|
};
|
|
|
|
template <typename T, typename V>
|
|
Vec2<T> operator*(const V& f, const Vec2<T>& vec) {
|
|
return Vec2<T>(f * vec.x, f * vec.y);
|
|
}
|
|
|
|
typedef Vec2<float> Vec2f;
|
|
|
|
template <>
|
|
inline float Vec2<float>::Length() const {
|
|
return std::sqrt(x * x + y * y);
|
|
}
|
|
|
|
template <>
|
|
inline float Vec2<float>::Normalize() {
|
|
float length = Length();
|
|
*this /= length;
|
|
return length;
|
|
}
|
|
|
|
template <typename T>
|
|
class Vec3 {
|
|
public:
|
|
T x;
|
|
T y;
|
|
T z;
|
|
|
|
T* AsArray() {
|
|
return &x;
|
|
}
|
|
|
|
Vec3() = default;
|
|
Vec3(const T& _x, const T& _y, const T& _z) : x(_x), y(_y), z(_z) {}
|
|
|
|
template <typename T2>
|
|
Vec3<T2> Cast() const {
|
|
return MakeVec<T2>((T2)x, (T2)y, (T2)z);
|
|
}
|
|
|
|
// Only implemented for T=int and T=float
|
|
static Vec3 FromRGB(unsigned int rgb);
|
|
unsigned int ToRGB() const; // alpha bits set to zero
|
|
|
|
static Vec3 AssignToAll(const T& f) {
|
|
return MakeVec(f, f, f);
|
|
}
|
|
|
|
void Write(T a[3]) {
|
|
a[0] = x;
|
|
a[1] = y;
|
|
a[2] = z;
|
|
}
|
|
|
|
Vec3<decltype(T{} + T{})> operator+(const Vec3& other) const {
|
|
return MakeVec(x + other.x, y + other.y, z + other.z);
|
|
}
|
|
void operator+=(const Vec3& other) {
|
|
x += other.x;
|
|
y += other.y;
|
|
z += other.z;
|
|
}
|
|
Vec3<decltype(T{} - T{})> operator-(const Vec3& other) const {
|
|
return MakeVec(x - other.x, y - other.y, z - other.z);
|
|
}
|
|
void operator-=(const Vec3& other) {
|
|
x -= other.x;
|
|
y -= other.y;
|
|
z -= other.z;
|
|
}
|
|
template <typename Q = T, class = typename std::enable_if<std::is_signed<Q>::value>::type>
|
|
Vec3<decltype(-T{})> operator-() const {
|
|
return MakeVec(-x, -y, -z);
|
|
}
|
|
Vec3<decltype(T{} * T{})> operator*(const Vec3& other) const {
|
|
return MakeVec(x * other.x, y * other.y, z * other.z);
|
|
}
|
|
template <typename V>
|
|
Vec3<decltype(T{} * V{})> operator*(const V& f) const {
|
|
return MakeVec(x * f, y * f, z * f);
|
|
}
|
|
template <typename V>
|
|
void operator*=(const V& f) {
|
|
x *= f;
|
|
y *= f;
|
|
z *= f;
|
|
}
|
|
template <typename V>
|
|
Vec3<decltype(T{} / V{})> operator/(const V& f) const {
|
|
return MakeVec(x / f, y / f, z / f);
|
|
}
|
|
template <typename V>
|
|
void operator/=(const V& f) {
|
|
*this = *this / f;
|
|
}
|
|
|
|
T Length2() const {
|
|
return x * x + y * y + z * z;
|
|
}
|
|
|
|
// Only implemented for T=float
|
|
float Length() const;
|
|
void SetLength(const float l);
|
|
Vec3 WithLength(const float l) const;
|
|
float Distance2To(Vec3& other);
|
|
Vec3 Normalized() const;
|
|
float Normalize(); // returns the previous length, which is often useful
|
|
|
|
T& operator[](int i) // allow vector[2] = 3 (vector.z=3)
|
|
{
|
|
return *((&x) + i);
|
|
}
|
|
T operator[](const int i) const {
|
|
return *((&x) + i);
|
|
}
|
|
|
|
void SetZero() {
|
|
x = 0;
|
|
y = 0;
|
|
z = 0;
|
|
}
|
|
|
|
// Common aliases: UVW (texel coordinates), RGB (colors), STQ (texture coordinates)
|
|
T& u() {
|
|
return x;
|
|
}
|
|
T& v() {
|
|
return y;
|
|
}
|
|
T& w() {
|
|
return z;
|
|
}
|
|
|
|
T& r() {
|
|
return x;
|
|
}
|
|
T& g() {
|
|
return y;
|
|
}
|
|
T& b() {
|
|
return z;
|
|
}
|
|
|
|
T& s() {
|
|
return x;
|
|
}
|
|
T& t() {
|
|
return y;
|
|
}
|
|
T& q() {
|
|
return z;
|
|
}
|
|
|
|
const T& u() const {
|
|
return x;
|
|
}
|
|
const T& v() const {
|
|
return y;
|
|
}
|
|
const T& w() const {
|
|
return z;
|
|
}
|
|
|
|
const T& r() const {
|
|
return x;
|
|
}
|
|
const T& g() const {
|
|
return y;
|
|
}
|
|
const T& b() const {
|
|
return z;
|
|
}
|
|
|
|
const T& s() const {
|
|
return x;
|
|
}
|
|
const T& t() const {
|
|
return y;
|
|
}
|
|
const T& q() const {
|
|
return z;
|
|
}
|
|
|
|
// swizzlers - create a subvector of specific components
|
|
// e.g. Vec2 uv() { return Vec2(x,y); }
|
|
// _DEFINE_SWIZZLER2 defines a single such function, DEFINE_SWIZZLER2 defines all of them for all
|
|
// component names (x<->r) and permutations (xy<->yx)
|
|
#define _DEFINE_SWIZZLER2(a, b, name) \
|
|
const Vec2<T> name() const { \
|
|
return Vec2<T>(a, b); \
|
|
}
|
|
#define DEFINE_SWIZZLER2(a, b, a2, b2, a3, b3, a4, b4) \
|
|
_DEFINE_SWIZZLER2(a, b, a##b); \
|
|
_DEFINE_SWIZZLER2(a, b, a2##b2); \
|
|
_DEFINE_SWIZZLER2(a, b, a3##b3); \
|
|
_DEFINE_SWIZZLER2(a, b, a4##b4); \
|
|
_DEFINE_SWIZZLER2(b, a, b##a); \
|
|
_DEFINE_SWIZZLER2(b, a, b2##a2); \
|
|
_DEFINE_SWIZZLER2(b, a, b3##a3); \
|
|
_DEFINE_SWIZZLER2(b, a, b4##a4)
|
|
|
|
DEFINE_SWIZZLER2(x, y, r, g, u, v, s, t);
|
|
DEFINE_SWIZZLER2(x, z, r, b, u, w, s, q);
|
|
DEFINE_SWIZZLER2(y, z, g, b, v, w, t, q);
|
|
#undef DEFINE_SWIZZLER2
|
|
#undef _DEFINE_SWIZZLER2
|
|
};
|
|
|
|
template <typename T, typename V>
|
|
Vec3<T> operator*(const V& f, const Vec3<T>& vec) {
|
|
return Vec3<T>(f * vec.x, f * vec.y, f * vec.z);
|
|
}
|
|
|
|
template <>
|
|
inline float Vec3<float>::Length() const {
|
|
return std::sqrt(x * x + y * y + z * z);
|
|
}
|
|
|
|
template <>
|
|
inline Vec3<float> Vec3<float>::Normalized() const {
|
|
return *this / Length();
|
|
}
|
|
|
|
template <>
|
|
inline float Vec3<float>::Normalize() {
|
|
float length = Length();
|
|
*this /= length;
|
|
return length;
|
|
}
|
|
|
|
typedef Vec3<float> Vec3f;
|
|
|
|
template <typename T>
|
|
class Vec4 {
|
|
public:
|
|
T x;
|
|
T y;
|
|
T z;
|
|
T w;
|
|
|
|
T* AsArray() {
|
|
return &x;
|
|
}
|
|
|
|
Vec4() = default;
|
|
Vec4(const T& _x, const T& _y, const T& _z, const T& _w) : x(_x), y(_y), z(_z), w(_w) {}
|
|
|
|
template <typename T2>
|
|
Vec4<T2> Cast() const {
|
|
return Vec4<T2>((T2)x, (T2)y, (T2)z, (T2)w);
|
|
}
|
|
|
|
// Only implemented for T=int and T=float
|
|
static Vec4 FromRGBA(unsigned int rgba);
|
|
unsigned int ToRGBA() const;
|
|
|
|
static Vec4 AssignToAll(const T& f) {
|
|
return Vec4<T>(f, f, f, f);
|
|
}
|
|
|
|
void Write(T a[4]) {
|
|
a[0] = x;
|
|
a[1] = y;
|
|
a[2] = z;
|
|
a[3] = w;
|
|
}
|
|
|
|
Vec4<decltype(T{} + T{})> operator+(const Vec4& other) const {
|
|
return MakeVec(x + other.x, y + other.y, z + other.z, w + other.w);
|
|
}
|
|
void operator+=(const Vec4& other) {
|
|
x += other.x;
|
|
y += other.y;
|
|
z += other.z;
|
|
w += other.w;
|
|
}
|
|
Vec4<decltype(T{} - T{})> operator-(const Vec4& other) const {
|
|
return MakeVec(x - other.x, y - other.y, z - other.z, w - other.w);
|
|
}
|
|
void operator-=(const Vec4& other) {
|
|
x -= other.x;
|
|
y -= other.y;
|
|
z -= other.z;
|
|
w -= other.w;
|
|
}
|
|
template <typename Q = T, class = typename std::enable_if<std::is_signed<Q>::value>::type>
|
|
Vec4<decltype(-T{})> operator-() const {
|
|
return MakeVec(-x, -y, -z, -w);
|
|
}
|
|
Vec4<decltype(T{} * T{})> operator*(const Vec4& other) const {
|
|
return MakeVec(x * other.x, y * other.y, z * other.z, w * other.w);
|
|
}
|
|
template <typename V>
|
|
Vec4<decltype(T{} * V{})> operator*(const V& f) const {
|
|
return MakeVec(x * f, y * f, z * f, w * f);
|
|
}
|
|
template <typename V>
|
|
void operator*=(const V& f) {
|
|
x *= f;
|
|
y *= f;
|
|
z *= f;
|
|
w *= f;
|
|
}
|
|
template <typename V>
|
|
Vec4<decltype(T{} / V{})> operator/(const V& f) const {
|
|
return MakeVec(x / f, y / f, z / f, w / f);
|
|
}
|
|
template <typename V>
|
|
void operator/=(const V& f) {
|
|
*this = *this / f;
|
|
}
|
|
|
|
T Length2() const {
|
|
return x * x + y * y + z * z + w * w;
|
|
}
|
|
|
|
// Only implemented for T=float
|
|
float Length() const;
|
|
void SetLength(const float l);
|
|
Vec4 WithLength(const float l) const;
|
|
float Distance2To(Vec4& other);
|
|
Vec4 Normalized() const;
|
|
float Normalize(); // returns the previous length, which is often useful
|
|
|
|
T& operator[](int i) // allow vector[2] = 3 (vector.z=3)
|
|
{
|
|
return *((&x) + i);
|
|
}
|
|
T operator[](const int i) const {
|
|
return *((&x) + i);
|
|
}
|
|
|
|
void SetZero() {
|
|
x = 0;
|
|
y = 0;
|
|
z = 0;
|
|
w = 0;
|
|
}
|
|
|
|
// Common alias: RGBA (colors)
|
|
T& r() {
|
|
return x;
|
|
}
|
|
T& g() {
|
|
return y;
|
|
}
|
|
T& b() {
|
|
return z;
|
|
}
|
|
T& a() {
|
|
return w;
|
|
}
|
|
|
|
const T& r() const {
|
|
return x;
|
|
}
|
|
const T& g() const {
|
|
return y;
|
|
}
|
|
const T& b() const {
|
|
return z;
|
|
}
|
|
const T& a() const {
|
|
return w;
|
|
}
|
|
|
|
// Swizzlers - Create a subvector of specific components
|
|
// e.g. Vec2 uv() { return Vec2(x,y); }
|
|
|
|
// _DEFINE_SWIZZLER2 defines a single such function
|
|
// DEFINE_SWIZZLER2_COMP1 defines one-component functions for all component names (x<->r)
|
|
// DEFINE_SWIZZLER2_COMP2 defines two component functions for all component names (x<->r) and
|
|
// permutations (xy<->yx)
|
|
#define _DEFINE_SWIZZLER2(a, b, name) \
|
|
const Vec2<T> name() const { \
|
|
return Vec2<T>(a, b); \
|
|
}
|
|
#define DEFINE_SWIZZLER2_COMP1(a, a2) \
|
|
_DEFINE_SWIZZLER2(a, a, a##a); \
|
|
_DEFINE_SWIZZLER2(a, a, a2##a2)
|
|
#define DEFINE_SWIZZLER2_COMP2(a, b, a2, b2) \
|
|
_DEFINE_SWIZZLER2(a, b, a##b); \
|
|
_DEFINE_SWIZZLER2(a, b, a2##b2); \
|
|
_DEFINE_SWIZZLER2(b, a, b##a); \
|
|
_DEFINE_SWIZZLER2(b, a, b2##a2)
|
|
|
|
DEFINE_SWIZZLER2_COMP2(x, y, r, g);
|
|
DEFINE_SWIZZLER2_COMP2(x, z, r, b);
|
|
DEFINE_SWIZZLER2_COMP2(x, w, r, a);
|
|
DEFINE_SWIZZLER2_COMP2(y, z, g, b);
|
|
DEFINE_SWIZZLER2_COMP2(y, w, g, a);
|
|
DEFINE_SWIZZLER2_COMP2(z, w, b, a);
|
|
DEFINE_SWIZZLER2_COMP1(x, r);
|
|
DEFINE_SWIZZLER2_COMP1(y, g);
|
|
DEFINE_SWIZZLER2_COMP1(z, b);
|
|
DEFINE_SWIZZLER2_COMP1(w, a);
|
|
#undef DEFINE_SWIZZLER2_COMP1
|
|
#undef DEFINE_SWIZZLER2_COMP2
|
|
#undef _DEFINE_SWIZZLER2
|
|
|
|
#define _DEFINE_SWIZZLER3(a, b, c, name) \
|
|
const Vec3<T> name() const { \
|
|
return Vec3<T>(a, b, c); \
|
|
}
|
|
#define DEFINE_SWIZZLER3_COMP1(a, a2) \
|
|
_DEFINE_SWIZZLER3(a, a, a, a##a##a); \
|
|
_DEFINE_SWIZZLER3(a, a, a, a2##a2##a2)
|
|
#define DEFINE_SWIZZLER3_COMP3(a, b, c, a2, b2, c2) \
|
|
_DEFINE_SWIZZLER3(a, b, c, a##b##c); \
|
|
_DEFINE_SWIZZLER3(a, c, b, a##c##b); \
|
|
_DEFINE_SWIZZLER3(b, a, c, b##a##c); \
|
|
_DEFINE_SWIZZLER3(b, c, a, b##c##a); \
|
|
_DEFINE_SWIZZLER3(c, a, b, c##a##b); \
|
|
_DEFINE_SWIZZLER3(c, b, a, c##b##a); \
|
|
_DEFINE_SWIZZLER3(a, b, c, a2##b2##c2); \
|
|
_DEFINE_SWIZZLER3(a, c, b, a2##c2##b2); \
|
|
_DEFINE_SWIZZLER3(b, a, c, b2##a2##c2); \
|
|
_DEFINE_SWIZZLER3(b, c, a, b2##c2##a2); \
|
|
_DEFINE_SWIZZLER3(c, a, b, c2##a2##b2); \
|
|
_DEFINE_SWIZZLER3(c, b, a, c2##b2##a2)
|
|
|
|
DEFINE_SWIZZLER3_COMP3(x, y, z, r, g, b);
|
|
DEFINE_SWIZZLER3_COMP3(x, y, w, r, g, a);
|
|
DEFINE_SWIZZLER3_COMP3(x, z, w, r, b, a);
|
|
DEFINE_SWIZZLER3_COMP3(y, z, w, g, b, a);
|
|
DEFINE_SWIZZLER3_COMP1(x, r);
|
|
DEFINE_SWIZZLER3_COMP1(y, g);
|
|
DEFINE_SWIZZLER3_COMP1(z, b);
|
|
DEFINE_SWIZZLER3_COMP1(w, a);
|
|
#undef DEFINE_SWIZZLER3_COMP1
|
|
#undef DEFINE_SWIZZLER3_COMP3
|
|
#undef _DEFINE_SWIZZLER3
|
|
};
|
|
|
|
template <typename T, typename V>
|
|
Vec4<decltype(V{} * T{})> operator*(const V& f, const Vec4<T>& vec) {
|
|
return MakeVec(f * vec.x, f * vec.y, f * vec.z, f * vec.w);
|
|
}
|
|
|
|
typedef Vec4<float> Vec4f;
|
|
|
|
template <typename T>
|
|
static inline decltype(T{} * T{} + T{} * T{}) Dot(const Vec2<T>& a, const Vec2<T>& b) {
|
|
return a.x * b.x + a.y * b.y;
|
|
}
|
|
|
|
template <typename T>
|
|
static inline decltype(T{} * T{} + T{} * T{}) Dot(const Vec3<T>& a, const Vec3<T>& b) {
|
|
return a.x * b.x + a.y * b.y + a.z * b.z;
|
|
}
|
|
|
|
template <typename T>
|
|
static inline decltype(T{} * T{} + T{} * T{}) Dot(const Vec4<T>& a, const Vec4<T>& b) {
|
|
return a.x * b.x + a.y * b.y + a.z * b.z + a.w * b.w;
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec3<decltype(T{} * T{} - T{} * T{})> Cross(const Vec3<T>& a, const Vec3<T>& b) {
|
|
return MakeVec(a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x);
|
|
}
|
|
|
|
// linear interpolation via float: 0.0=begin, 1.0=end
|
|
template <typename X>
|
|
static inline decltype(X{} * float{} + X{} * float{}) Lerp(const X& begin, const X& end,
|
|
const float t) {
|
|
return begin * (1.f - t) + end * t;
|
|
}
|
|
|
|
// linear interpolation via int: 0=begin, base=end
|
|
template <typename X, int base>
|
|
static inline decltype((X{} * int{} + X{} * int{}) / base) LerpInt(const X& begin, const X& end,
|
|
const int t) {
|
|
return (begin * (base - t) + end * t) / base;
|
|
}
|
|
|
|
// Utility vector factories
|
|
template <typename T>
|
|
static inline Vec2<T> MakeVec(const T& x, const T& y) {
|
|
return Vec2<T>{x, y};
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec3<T> MakeVec(const T& x, const T& y, const T& z) {
|
|
return Vec3<T>{x, y, z};
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const T& x, const T& y, const Vec2<T>& zw) {
|
|
return MakeVec(x, y, zw[0], zw[1]);
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec3<T> MakeVec(const Vec2<T>& xy, const T& z) {
|
|
return MakeVec(xy[0], xy[1], z);
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec3<T> MakeVec(const T& x, const Vec2<T>& yz) {
|
|
return MakeVec(x, yz[0], yz[1]);
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const T& x, const T& y, const T& z, const T& w) {
|
|
return Vec4<T>{x, y, z, w};
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const Vec2<T>& xy, const T& z, const T& w) {
|
|
return MakeVec(xy[0], xy[1], z, w);
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const T& x, const Vec2<T>& yz, const T& w) {
|
|
return MakeVec(x, yz[0], yz[1], w);
|
|
}
|
|
|
|
// NOTE: This has priority over "Vec2<Vec2<T>> MakeVec(const Vec2<T>& x, const Vec2<T>& y)".
|
|
// Even if someone wanted to use an odd object like Vec2<Vec2<T>>, the compiler would error
|
|
// out soon enough due to misuse of the returned structure.
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const Vec2<T>& xy, const Vec2<T>& zw) {
|
|
return MakeVec(xy[0], xy[1], zw[0], zw[1]);
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const Vec3<T>& xyz, const T& w) {
|
|
return MakeVec(xyz[0], xyz[1], xyz[2], w);
|
|
}
|
|
|
|
template <typename T>
|
|
static inline Vec4<T> MakeVec(const T& x, const Vec3<T>& yzw) {
|
|
return MakeVec(x, yzw[0], yzw[1], yzw[2]);
|
|
}
|
|
|
|
} // namespace
|