All block shapes & collisions (#22)

* start adding shapes

* add more collision stuff

* DiscreteCubeMerger

* more mergers

* start adding BitSetDiscreteVoxelShape::join

* i love rust :smiley: :smiley: :smiley:

* r

* IT COMPILES????

* fix warning

* fix error

* fix more clippy issues

* add box_shape

* more shape stuff

* make DiscreteVoxelShape an enum

* Update shape.rs

* also make VoxelShape an enum

* implement BitSet::clear

* add more missing things

* it compiles

W

* start block shape codegen

* optimize shape codegen

* make az-block/blocks.rs look better (broken)

* almost new block macro

* make the codegen not generate 'type'

* try to fix

* work more on the blocks macro

* wait it compiles

* fix clippy issues

* shapes codegen works

* well it's almost working

* simplify some shape codegen

* enum type names are correct

* W it compiles

* cargo check no longer warns

* fix some clippy issues

* start making it so the shape impl is on BlockStates

* insane code

* new impl compiles

* fix wrong find_bits + TESTS PASS!

* add a test for slab collision

* fix clippy issues

* ok rust

* fix error that happens when on stairs

* add test for top slabs

* start adding join_is_not_empty

* add more to join_is_not_empty

* top slabs still don't work!!

* x..=0 doesn't work in rust :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley: :smiley:

* remove comment since i added more useful names

* remove some printlns

* fix walls in some configurations erroring

* fix some warnings

* change comment to \`\`\`ignore instead of \`\`\`no_run

* players are .6 wide not .8

* fix clippy's complaints

* i missed one clippy warning

1 files changed, 36 insertions, 0 deletions

diff --git a/azalea-core/src/lib.rs b/azalea-core/src/lib.rs
index 66d9a2ea..f7726a38 100755
--- a/azalea-core/src/lib.rs
+++ b/azalea-core/src/lib.rs
@@ -64,3 +64,39 @@ pub fn binary_search(mut min: i32, max: i32, predicate: &dyn Fn(i32) -> bool) ->
 
     min
 }
+
+pub fn lcm(a: u32, b: u32) -> u64 {
+    let gcd = gcd(a, b);
+    (a as u64) * (b / gcd) as u64
+}
+pub fn gcd(mut a: u32, mut b: u32) -> u32 {
+    while b != 0 {
+        let t = b;
+        b = a % b;
+        a = t;
+    }
+    a
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_gcd() {
+        assert_eq!(gcd(0, 0), 0);
+        assert_eq!(gcd(1, 1), 1);
+
+        assert_eq!(gcd(0, 1), 1);
+        assert_eq!(gcd(1, 0), 1);
+
+        assert_eq!(gcd(12, 8), 4);
+        assert_eq!(gcd(8, 12), 4);
+
+        assert_eq!(gcd(12, 9), 3);
+        assert_eq!(gcd(9, 12), 3);
+
+        assert_eq!(gcd(12, 7), 1);
+        assert_eq!(gcd(7, 12), 1);
+    }
+}