Added optional serde support

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "gfx-maths"
-version = "0.2.1"
+version = "0.2.2"
 authors = [ "Robin Quint" ]
 edition = "2018"
 description = "Implementations for the most essential Graphics Math operations"
@@ -17,6 +17,7 @@ categories = [
 
 [dependencies]
 auto_ops = "0.3.0"
+serde = { version="1.0.127", features=["derive"], optional=true }
 
 [features]
 default = []

src/mat4.rs

@@ -8,6 +8,7 @@ use crate::{Quaternion, Vec3, Vec4};
 /// as expected by OpenGL and accepted by all other APIs.
 /// To change this, use feature `mat-row-major`
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature="serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Mat4 {
     pub values: [f32; 4*4],

src/quaternion.rs

@@ -3,6 +3,7 @@ use crate::Vec3;
 use auto_ops::*;
 
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature="serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Quaternion {
     pub x: f32,

src/vec2.rs

@@ -3,6 +3,7 @@ use std::ops::Neg;
 use auto_ops::*;
 
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature="serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Vec2 {
     pub x: f32,

src/vec3.rs

@@ -3,6 +3,7 @@ use std::ops::Neg;
 use auto_ops::*;
 
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature="serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Vec3 {
     pub x: f32,

src/vec4.rs

@@ -3,6 +3,7 @@ use std::ops::Neg;
 use auto_ops::*;
 
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature="serde", derive(serde::Serialize, serde::Deserialize))]
 #[repr(C)]
 pub struct Vec4 {
     pub x: f32,