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Added missing quat constexpr #955

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Christophe Riccio 2019-11-06 15:03:32 +01:00
parent 95b1cdbbfe
commit 3da0e18de7
5 changed files with 51 additions and 50 deletions
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40
glm/detail/type_quat.hpp
View File

@ -102,67 +102,67 @@ namespace glm
GLM_FUNC_DECL qua(vec<3, T, Q> const& u, vec<3, T, Q> const& v); GLM_FUNC_DECL qua(vec<3, T, Q> const& u, vec<3, T, Q> const& v);
/// Build a quaternion from euler angles (pitch, yaw, roll), in radians. /// Build a quaternion from euler angles (pitch, yaw, roll), in radians.
GLM_FUNC_DECL GLM_EXPLICIT qua(vec<3, T, Q> const& eulerAngles); GLM_FUNC_DECL GLM_CONSTEXPR GLM_EXPLICIT qua(vec<3, T, Q> const& eulerAngles);
GLM_FUNC_DECL GLM_EXPLICIT qua(mat<3, 3, T, Q> const& q); GLM_FUNC_DECL GLM_EXPLICIT qua(mat<3, 3, T, Q> const& q);
GLM_FUNC_DECL GLM_EXPLICIT qua(mat<4, 4, T, Q> const& q); GLM_FUNC_DECL GLM_EXPLICIT qua(mat<4, 4, T, Q> const& q);
// -- Unary arithmetic operators -- // -- Unary arithmetic operators --
GLM_FUNC_DECL qua<T, Q>& operator=(qua<T, Q> const& q) GLM_DEFAULT; GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q>& operator=(qua<T, Q> const& q) GLM_DEFAULT;
template<typename U> template<typename U>
GLM_FUNC_DECL qua<T, Q>& operator=(qua<U, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q>& operator=(qua<U, Q> const& q);
template<typename U> template<typename U>
GLM_FUNC_DECL qua<T, Q>& operator+=(qua<U, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q>& operator+=(qua<U, Q> const& q);
template<typename U> template<typename U>
GLM_FUNC_DECL qua<T, Q>& operator-=(qua<U, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q>& operator-=(qua<U, Q> const& q);
template<typename U> template<typename U>
GLM_FUNC_DECL qua<T, Q>& operator*=(qua<U, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q>& operator*=(qua<U, Q> const& q);
template<typename U> template<typename U>
GLM_FUNC_DECL qua<T, Q>& operator*=(U s); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q>& operator*=(U s);
template<typename U> template<typename U>
GLM_FUNC_DECL qua<T, Q>& operator/=(U s); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q>& operator/=(U s);
}; };
// -- Unary bit operators -- // -- Unary bit operators --
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator+(qua<T, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator+(qua<T, Q> const& q);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator-(qua<T, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator-(qua<T, Q> const& q);
// -- Binary operators -- // -- Binary operators --
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator+(qua<T, Q> const& q, qua<T, Q> const& p); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator+(qua<T, Q> const& q, qua<T, Q> const& p);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator-(qua<T, Q> const& q, qua<T, Q> const& p); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator-(qua<T, Q> const& q, qua<T, Q> const& p);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator*(qua<T, Q> const& q, qua<T, Q> const& p); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator*(qua<T, Q> const& q, qua<T, Q> const& p);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL vec<3, T, Q> operator*(qua<T, Q> const& q, vec<3, T, Q> const& v); GLM_FUNC_DECL GLM_CONSTEXPR vec<3, T, Q> operator*(qua<T, Q> const& q, vec<3, T, Q> const& v);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL vec<3, T, Q> operator*(vec<3, T, Q> const& v, qua<T, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR vec<3, T, Q> operator*(vec<3, T, Q> const& v, qua<T, Q> const& q);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL vec<4, T, Q> operator*(qua<T, Q> const& q, vec<4, T, Q> const& v); GLM_FUNC_DECL GLM_CONSTEXPR vec<4, T, Q> operator*(qua<T, Q> const& q, vec<4, T, Q> const& v);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL vec<4, T, Q> operator*(vec<4, T, Q> const& v, qua<T, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR vec<4, T, Q> operator*(vec<4, T, Q> const& v, qua<T, Q> const& q);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator*(qua<T, Q> const& q, T const& s); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator*(qua<T, Q> const& q, T const& s);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator*(T const& s, qua<T, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator*(T const& s, qua<T, Q> const& q);
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> operator/(qua<T, Q> const& q, T const& s); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> operator/(qua<T, Q> const& q, T const& s);
// -- Boolean operators -- // -- Boolean operators --

52
glm/detail/type_quat.inl
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@ -15,7 +15,7 @@ namespace detail
template<typename T, qualifier Q, bool Aligned> template<typename T, qualifier Q, bool Aligned>
struct compute_dot<qua<T, Q>, T, Aligned> struct compute_dot<qua<T, Q>, T, Aligned>
{ {
static GLM_FUNC_QUALIFIER T call(qua<T, Q> const& a, qua<T, Q> const& b) GLM_FUNC_QUALIFIER GLM_CONSTEXPR static T call(qua<T, Q> const& a, qua<T, Q> const& b)
{ {
vec<4, T, Q> tmp(a.w * b.w, a.x * b.x, a.y * b.y, a.z * b.z); vec<4, T, Q> tmp(a.w * b.w, a.x * b.x, a.y * b.y, a.z * b.z);
return (tmp.x + tmp.y) + (tmp.z + tmp.w); return (tmp.x + tmp.y) + (tmp.z + tmp.w);
@ -25,7 +25,7 @@ namespace detail
template<typename T, qualifier Q, bool Aligned> template<typename T, qualifier Q, bool Aligned>
struct compute_quat_add struct compute_quat_add
{ {
static qua<T, Q> call(qua<T, Q> const& q, qua<T, Q> const& p) GLM_FUNC_QUALIFIER GLM_CONSTEXPR static qua<T, Q> call(qua<T, Q> const& q, qua<T, Q> const& p)
{ {
return qua<T, Q>(q.w + p.w, q.x + p.x, q.y + p.y, q.z + p.z); return qua<T, Q>(q.w + p.w, q.x + p.x, q.y + p.y, q.z + p.z);
} }
@ -34,7 +34,7 @@ namespace detail
template<typename T, qualifier Q, bool Aligned> template<typename T, qualifier Q, bool Aligned>
struct compute_quat_sub struct compute_quat_sub
{ {
static qua<T, Q> call(qua<T, Q> const& q, qua<T, Q> const& p) GLM_FUNC_QUALIFIER GLM_CONSTEXPR static qua<T, Q> call(qua<T, Q> const& q, qua<T, Q> const& p)
{ {
return qua<T, Q>(q.w - p.w, q.x - p.x, q.y - p.y, q.z - p.z); return qua<T, Q>(q.w - p.w, q.x - p.x, q.y - p.y, q.z - p.z);
} }
@ -43,7 +43,7 @@ namespace detail
template<typename T, qualifier Q, bool Aligned> template<typename T, qualifier Q, bool Aligned>
struct compute_quat_mul_scalar struct compute_quat_mul_scalar
{ {
static qua<T, Q> call(qua<T, Q> const& q, T s) GLM_FUNC_QUALIFIER GLM_CONSTEXPR static qua<T, Q> call(qua<T, Q> const& q, T s)
{ {
return qua<T, Q>(q.w * s, q.x * s, q.y * s, q.z * s); return qua<T, Q>(q.w * s, q.x * s, q.y * s, q.z * s);
} }
@ -52,7 +52,7 @@ namespace detail
template<typename T, qualifier Q, bool Aligned> template<typename T, qualifier Q, bool Aligned>
struct compute_quat_div_scalar struct compute_quat_div_scalar
{ {
static qua<T, Q> call(qua<T, Q> const& q, T s) GLM_FUNC_QUALIFIER GLM_CONSTEXPR static qua<T, Q> call(qua<T, Q> const& q, T s)
{ {
return qua<T, Q>(q.w / s, q.x / s, q.y / s, q.z / s); return qua<T, Q>(q.w / s, q.x / s, q.y / s, q.z / s);
} }
@ -61,7 +61,7 @@ namespace detail
template<typename T, qualifier Q, bool Aligned> template<typename T, qualifier Q, bool Aligned>
struct compute_quat_mul_vec4 struct compute_quat_mul_vec4
{ {
static vec<4, T, Q> call(qua<T, Q> const& q, vec<4, T, Q> const& v) GLM_FUNC_QUALIFIER GLM_CONSTEXPR static vec<4, T, Q> call(qua<T, Q> const& q, vec<4, T, Q> const& v)
{ {
return vec<4, T, Q>(q * vec<3, T, Q>(v), v.w); return vec<4, T, Q>(q * vec<3, T, Q>(v), v.w);
} }
@ -172,7 +172,7 @@ namespace detail
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q>::qua(vec<3, T, Q> const& eulerAngle) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q>::qua(vec<3, T, Q> const& eulerAngle)
{ {
vec<3, T, Q> c = glm::cos(eulerAngle * T(0.5)); vec<3, T, Q> c = glm::cos(eulerAngle * T(0.5));
vec<3, T, Q> s = glm::sin(eulerAngle * T(0.5)); vec<3, T, Q> s = glm::sin(eulerAngle * T(0.5));
@ -213,7 +213,7 @@ namespace detail
# if GLM_CONFIG_DEFAULTED_FUNCTIONS == GLM_DISABLE # if GLM_CONFIG_DEFAULTED_FUNCTIONS == GLM_DISABLE
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> & qua<T, Q>::operator=(qua<T, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> & qua<T, Q>::operator=(qua<T, Q> const& q)
{ {
this->w = q.w; this->w = q.w;
this->x = q.x; this->x = q.x;
@ -225,7 +225,7 @@ namespace detail
template<typename T, qualifier Q> template<typename T, qualifier Q>
template<typename U> template<typename U>
GLM_FUNC_QUALIFIER qua<T, Q> & qua<T, Q>::operator=(qua<U, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> & qua<T, Q>::operator=(qua<U, Q> const& q)
{ {
this->w = static_cast<T>(q.w); this->w = static_cast<T>(q.w);
this->x = static_cast<T>(q.x); this->x = static_cast<T>(q.x);
@ -236,21 +236,21 @@ namespace detail
template<typename T, qualifier Q> template<typename T, qualifier Q>
template<typename U> template<typename U>
GLM_FUNC_QUALIFIER qua<T, Q> & qua<T, Q>::operator+=(qua<U, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> & qua<T, Q>::operator+=(qua<U, Q> const& q)
{ {
return (*this = detail::compute_quat_add<T, Q, detail::is_aligned<Q>::value>::call(*this, qua<T, Q>(q))); return (*this = detail::compute_quat_add<T, Q, detail::is_aligned<Q>::value>::call(*this, qua<T, Q>(q)));
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
template<typename U> template<typename U>
GLM_FUNC_QUALIFIER qua<T, Q> & qua<T, Q>::operator-=(qua<U, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> & qua<T, Q>::operator-=(qua<U, Q> const& q)
{ {
return (*this = detail::compute_quat_sub<T, Q, detail::is_aligned<Q>::value>::call(*this, qua<T, Q>(q))); return (*this = detail::compute_quat_sub<T, Q, detail::is_aligned<Q>::value>::call(*this, qua<T, Q>(q)));
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
template<typename U> template<typename U>
GLM_FUNC_QUALIFIER qua<T, Q> & qua<T, Q>::operator*=(qua<U, Q> const& r) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> & qua<T, Q>::operator*=(qua<U, Q> const& r)
{ {
qua<T, Q> const p(*this); qua<T, Q> const p(*this);
qua<T, Q> const q(r); qua<T, Q> const q(r);
@ -264,14 +264,14 @@ namespace detail
template<typename T, qualifier Q> template<typename T, qualifier Q>
template<typename U> template<typename U>
GLM_FUNC_QUALIFIER qua<T, Q> & qua<T, Q>::operator*=(U s) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> & qua<T, Q>::operator*=(U s)
{ {
return (*this = detail::compute_quat_mul_scalar<T, Q, detail::is_aligned<Q>::value>::call(*this, static_cast<U>(s))); return (*this = detail::compute_quat_mul_scalar<T, Q, detail::is_aligned<Q>::value>::call(*this, static_cast<U>(s)));
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
template<typename U> template<typename U>
GLM_FUNC_QUALIFIER qua<T, Q> & qua<T, Q>::operator/=(U s) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> & qua<T, Q>::operator/=(U s)
{ {
return (*this = detail::compute_quat_div_scalar<T, Q, detail::is_aligned<Q>::value>::call(*this, static_cast<U>(s))); return (*this = detail::compute_quat_div_scalar<T, Q, detail::is_aligned<Q>::value>::call(*this, static_cast<U>(s)));
} }
@ -279,13 +279,13 @@ namespace detail
// -- Unary bit operators -- // -- Unary bit operators --
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator+(qua<T, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator+(qua<T, Q> const& q)
{ {
return q; return q;
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator-(qua<T, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator-(qua<T, Q> const& q)
{ {
return qua<T, Q>(-q.w, -q.x, -q.y, -q.z); return qua<T, Q>(-q.w, -q.x, -q.y, -q.z);
} }
@ -293,25 +293,25 @@ namespace detail
// -- Binary operators -- // -- Binary operators --
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator+(qua<T, Q> const& q, qua<T, Q> const& p) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator+(qua<T, Q> const& q, qua<T, Q> const& p)
{ {
return qua<T, Q>(q) += p; return qua<T, Q>(q) += p;
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator-(qua<T, Q> const& q, qua<T, Q> const& p) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator-(qua<T, Q> const& q, qua<T, Q> const& p)
{ {
return qua<T, Q>(q) -= p; return qua<T, Q>(q) -= p;
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator*(qua<T, Q> const& q, qua<T, Q> const& p) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator*(qua<T, Q> const& q, qua<T, Q> const& p)
{ {
return qua<T, Q>(q) *= p; return qua<T, Q>(q) *= p;
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<3, T, Q> operator*(qua<T, Q> const& q, vec<3, T, Q> const& v) GLM_FUNC_QUALIFIER GLM_CONSTEXPR vec<3, T, Q> operator*(qua<T, Q> const& q, vec<3, T, Q> const& v)
{ {
vec<3, T, Q> const QuatVector(q.x, q.y, q.z); vec<3, T, Q> const QuatVector(q.x, q.y, q.z);
vec<3, T, Q> const uv(glm::cross(QuatVector, v)); vec<3, T, Q> const uv(glm::cross(QuatVector, v));
@ -321,38 +321,38 @@ namespace detail
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<3, T, Q> operator*(vec<3, T, Q> const& v, qua<T, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR vec<3, T, Q> operator*(vec<3, T, Q> const& v, qua<T, Q> const& q)
{ {
return glm::inverse(q) * v; return glm::inverse(q) * v;
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<4, T, Q> operator*(qua<T, Q> const& q, vec<4, T, Q> const& v) GLM_FUNC_QUALIFIER GLM_CONSTEXPR vec<4, T, Q> operator*(qua<T, Q> const& q, vec<4, T, Q> const& v)
{ {
return detail::compute_quat_mul_vec4<T, Q, detail::is_aligned<Q>::value>::call(q, v); return detail::compute_quat_mul_vec4<T, Q, detail::is_aligned<Q>::value>::call(q, v);
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<4, T, Q> operator*(vec<4, T, Q> const& v, qua<T, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR vec<4, T, Q> operator*(vec<4, T, Q> const& v, qua<T, Q> const& q)
{ {
return glm::inverse(q) * v; return glm::inverse(q) * v;
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator*(qua<T, Q> const& q, T const& s) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator*(qua<T, Q> const& q, T const& s)
{ {
return qua<T, Q>( return qua<T, Q>(
q.w * s, q.x * s, q.y * s, q.z * s); q.w * s, q.x * s, q.y * s, q.z * s);
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator*(T const& s, qua<T, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator*(T const& s, qua<T, Q> const& q)
{ {
return q * s; return q * s;
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> operator/(qua<T, Q> const& q, T const& s) GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> operator/(qua<T, Q> const& q, T const& s)
{ {
return qua<T, Q>( return qua<T, Q>(
q.w / s, q.x / s, q.y / s, q.z / s); q.w / s, q.x / s, q.y / s, q.z / s);

4
glm/gtx/quaternion.hpp
View File

@ -37,7 +37,7 @@ namespace glm
/// ///
/// @see gtx_quaternion /// @see gtx_quaternion
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL qua<T, Q> quat_identity(); GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> quat_identity();
/// Compute a cross product between a quaternion and a vector. /// Compute a cross product between a quaternion and a vector.
/// ///
@ -166,7 +166,7 @@ namespace glm
/// ///
/// @see gtx_quaternion /// @see gtx_quaternion
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_DECL T length2(qua<T, Q> const& q); GLM_FUNC_DECL GLM_CONSTEXPR T length2(qua<T, Q> const& q);
/// @} /// @}
}//namespace glm }//namespace glm

4
glm/gtx/quaternion.inl
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@ -6,7 +6,7 @@
namespace glm namespace glm
{ {
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER qua<T, Q> quat_identity() GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> quat_identity()
{ {
return qua<T, Q>(static_cast<T>(1), static_cast<T>(0), static_cast<T>(0), static_cast<T>(0)); return qua<T, Q>(static_cast<T>(1), static_cast<T>(0), static_cast<T>(0), static_cast<T>(0));
} }
@ -70,7 +70,7 @@ namespace glm
} }
template<typename T, qualifier Q> template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER T length2(qua<T, Q> const& q) GLM_FUNC_QUALIFIER GLM_CONSTEXPR T length2(qua<T, Q> const& q)
{ {
return q.x * q.x + q.y * q.y + q.z * q.z + q.w * q.w; return q.x * q.x + q.y * q.y + q.z * q.z + q.w * q.w;
} }

1
readme.md
View File

@ -58,6 +58,7 @@ glm::mat4 camera(float Translate, glm::vec2 const& Rotate)
- Improved Neon support with more functions optimized #950 - Improved Neon support with more functions optimized #950
- Added CMake GLM interface #963 - Added CMake GLM interface #963
- Added fma implementation based on std::fma #969 - Added fma implementation based on std::fma #969
- Added missing quat constexpr #955
#### Fixes: #### Fixes:
- Fixed equal ULP variation when using negative sign #965 - Fixed equal ULP variation when using negative sign #965