Added glam 0.21 update. (#1075)

Co-authored-by: Joe Clay <[email protected]>

Author: bitshifter

content/news/035/index.md

@@ -271,6 +271,25 @@ cleaner and smaller code.
 [ezinput]: https://crates.io/crates/ezinput/versions
 [ezinput_creator]: https://github.com/eexsty
 
+### [glam] v0.21
+
+[glam] is a simple and fast linear algebra crate for games and graphics.
+
+This month version 0.21 of glam was released. Because glam is not a generic
+library, when support was added for `f64`, `i32` and `u32` types back in glam
+0.12, macros were used internally to avoid a lot of code duplication. This
+unfortunately obfuscated the internals of glam for anyone who needed to view the
+source.
+
+As of the 0.21 release the majority of glam code is now generated using an
+offline tool and committed to the repo. The macros that were used to define
+glam's internal implementation are gone. This means what users see when reading
+docs or stepping through glam in the debugger is plain old Rust code. Many
+functions have also been made `const fn` removing the need for macros to create
+`const` values.
+
+[glam]: https://github.com/bitshifter/glam-rs
+
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