3 files changed, 98 insertions, 35 deletions

diff --git a/azalea-block/azalea-block-macros/src/lib.rs b/azalea-block/azalea-block-macros/src/lib.rs
index ac61912f..85887418 100644
--- a/azalea-block/azalea-block-macros/src/lib.rs
+++ b/azalea-block/azalea-block-macros/src/lib.rs
@@ -426,45 +426,45 @@ pub fn make_block_states(input: TokenStream) -> TokenStream {
             quote! { BlockState::#block_name_pascal_case }
         };
 
-            let block_struct = quote! {
-                #[derive(Debug)]
-                pub struct #block_struct_name {
-                    #block_struct_fields
-                }
+        let block_struct = quote! {
+            #[derive(Debug, Copy, Clone)]
+            pub struct #block_struct_name {
+                #block_struct_fields
+            }
 
-                impl Block for #block_struct_name {
-                    fn behavior(&self) -> BlockBehavior {
-                        #block_behavior
-                    }
-                    fn id(&self) -> &'static str {
-                        #block_id
-                    }
+            impl Block for #block_struct_name {
+                fn behavior(&self) -> BlockBehavior {
+                    #block_behavior
+                }
+                fn id(&self) -> &'static str {
+                    #block_id
                 }
+            }
 
-                impl From<#block_struct_name> for BlockState {
-                    fn from(b: #block_struct_name) -> Self {
-                        #from_block_to_state_match
-                    }
+            impl From<#block_struct_name> for BlockState {
+                fn from(b: #block_struct_name) -> Self {
+                    #from_block_to_state_match
                 }
+            }
 
-                impl Default for #block_struct_name {
-                    fn default() -> Self {
-                        Self {
-                            #block_default_fields
-                        }
+            impl Default for #block_struct_name {
+                fn default() -> Self {
+                    Self {
+                        #block_default_fields
                     }
                 }
-            };
+            }
+        };
 
-            block_structs.extend(block_struct);
-        }
+        block_structs.extend(block_struct);
+    }
 
     let last_state_id = (state_id - 1) as u32;
     let mut generated = quote! {
         #property_enums
 
         #[repr(u32)]
-        #[derive(Copy, Clone, PartialEq, Eq, Debug)]
+        #[derive(Copy, Clone, PartialEq, Eq)]
         pub enum BlockState {
             #block_state_enum_variants
         }
@@ -476,21 +476,28 @@ pub fn make_block_states(input: TokenStream) -> TokenStream {
                 #last_state_id
             }
         }
+
+        impl std::fmt::Debug for BlockState {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+                // having a big match statement here would take up 700kb
+                f.write_str("BlockState")
+            }
+        }
     };
 
-        generated.extend(quote! {
-            #block_structs
+    generated.extend(quote! {
+        #block_structs
 
-            impl From<BlockState> for Box<dyn Block> {
-                fn from(b: BlockState) -> Self {
-                    let b = b as usize;
-                    match b {
-                        #from_state_to_block_match
-                        _ => panic!("Invalid block state: {}", b),
-                    }
+        impl From<BlockState> for Box<dyn Block> {
+            fn from(b: BlockState) -> Self {
+                let b = b as usize;
+                match b {
+                    #from_state_to_block_match
+                    _ => panic!("Invalid block state: {}", b),
                 }
             }
-        });
+        }
+    });
 
     generated.into()
 }
diff --git a/azalea-block/src/lib.rs b/azalea-block/src/lib.rs
index fdcfe631..969288f5 100644
--- a/azalea-block/src/lib.rs
+++ b/azalea-block/src/lib.rs
@@ -63,4 +63,10 @@ mod tests {
         assert!(BlockState::try_from(BlockState::max_state()).is_ok());
         assert!(BlockState::try_from(BlockState::max_state() + 1).is_err());
     }
+
+    #[test]
+    fn test_from_blockstate() {
+        let box_block: Box<dyn Block> = Box::<dyn Block>::from(BlockState::Air);
+        assert_eq!(box_block.id(), "air");
+    }
 }
diff --git a/azalea-core/src/bitset.rs b/azalea-core/src/bitset.rs
index 2ffd5657..6f0a27ca 100644
--- a/azalea-core/src/bitset.rs
+++ b/azalea-core/src/bitset.rs
@@ -7,6 +7,8 @@ pub struct BitSet {
     data: Vec<u64>,
 }
 
+const ADDRESS_BITS_PER_WORD: usize = 6;
+
 // the Index trait requires us to return a reference, but we can't do that
 impl BitSet {
     pub fn new(size: usize) -> Self {
@@ -18,6 +20,54 @@ impl BitSet {
     pub fn index(&self, index: usize) -> bool {
         (self.data[index / 64] & (1u64 << (index % 64))) != 0
     }
+
+    // private static int wordIndex(int bitIndex) {
+    //     return bitIndex >> ADDRESS_BITS_PER_WORD;
+    // }
+    pub fn word_index(bit_index: usize) -> usize {
+        bit_index >> ADDRESS_BITS_PER_WORD
+    }
+
+    pub fn clear_from_to(&mut self, from: usize, to: usize) {
+        assert!(from <= to);
+        assert!(to <= self.data.len() * 64);
+        assert!(to > 0);
+
+        if from == to {
+            return;
+        }
+
+        // int startWordIndex = wordIndex(fromIndex);
+        // if (startWordIndex >= wordsInUse)
+        //     return;
+
+        // int endWordIndex = wordIndex(toIndex - 1);
+        // if (endWordIndex >= wordsInUse) {
+        //     toIndex = length();
+        //     endWordIndex = wordsInUse - 1;
+        // }
+
+        // long firstWordMask = WORD_MASK << fromIndex;
+        // long lastWordMask  = WORD_MASK >>> -toIndex;
+        // if (startWordIndex == endWordIndex) {
+        //     // Case 1: One word
+        //     words[startWordIndex] &= ~(firstWordMask & lastWordMask);
+        // } else {
+        //     // Case 2: Multiple words
+        //     // Handle first word
+        //     words[startWordIndex] &= ~firstWordMask;
+
+        //     // Handle intermediate words, if any
+        //     for (int i = startWordIndex+1; i < endWordIndex; i++)
+        //         words[i] = 0;
+
+        //     // Handle last word
+        //     words[endWordIndex] &= ~lastWordMask;
+        // }
+
+        // recalculateWordsInUse();
+        // checkInvariants();
+    }
 }
 
 impl McBufReadable for BitSet {