Performance enhancements for #141 (#173)

This PR also includes the Criterion benchmark.

## Before this commit
> Benchmarking BlockState::to_kind
> Benchmarking BlockState::to_kind: Warming up for 3.0000 s Benchmarking
BlockState::to_kind: Collecting 100 samples in estimated 20.045 s (273k
iterations) Benchmarking BlockState::to_kind: Analyzing
> BlockState::to_kind     time:   [68.925 µs 69.202 µs 69.477 µs]
> 
> Found 5 outliers among 100 measurements (5.00%)
>   4 (4.00%) high mild
>   1 (1.00%) high severe

## After this commit
> Benchmarking BlockState::to_kind
> Benchmarking BlockState::to_kind: Warming up for 3.0000 s Benchmarking
BlockState::to_kind: Collecting 100 samples in estimated 20.010 s (3.8M
iterations) Benchmarking BlockState::to_kind: Analyzing
> BlockState::to_kind     time:   [1.5814 µs 1.5859 µs 1.5912 µs]
> change: [-97.692% -97.678% -97.666%] (p = 0.00 < 0.05)
>                         Performance has improved.
> Found 4 outliers among 100 measurements (4.00%)
>   4 (4.00%) high mild

Co-authored-by: Ryan Johnson <ryanj00a@gmail.com>

valence_protocol/Cargo.toml

@@ -22,6 +22,11 @@ valence_nbt = { version = "0.5.0", path = "../valence_nbt" }
 
 [dev-dependencies]
 rand = "0.8.5"
+criterion = "0.4.0"
+
+[[bench]]
+name = "benches"
+harness = false
 
 [build-dependencies]
 anyhow = "1.0.65"

valence_protocol/benches/benches.rs

@@ -0,0 +1,97 @@
+use std::time::Duration;
+
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use valence_protocol::block::{PropName, PropValue};
+use valence_protocol::{BlockKind, BlockState, ItemKind};
+
+criterion_group! {
+    name = benches;
+    config = Criterion::default()
+        .measurement_time(Duration::from_secs(3));
+    targets = blocks
+}
+criterion_main!(benches);
+
+fn blocks(c: &mut Criterion) {
+    let states = BlockKind::ALL.map(BlockKind::to_state);
+
+    c.bench_function("BlockState::from_kind", |b| {
+        b.iter(|| {
+            for kind in black_box(BlockKind::ALL) {
+                black_box(BlockState::from_kind(kind));
+            }
+        });
+    });
+
+    c.bench_function("BlockState::to_kind", |b| {
+        b.iter(|| {
+            for state in black_box(states) {
+                black_box(state.to_kind());
+            }
+        });
+    });
+
+    c.bench_function("BlockState::get", |b| {
+        b.iter(|| {
+            for state in black_box(states) {
+                black_box(state.get(PropName::Note));
+            }
+        });
+    });
+
+    c.bench_function("BlockState::set", |b| {
+        b.iter(|| {
+            for state in black_box(states) {
+                black_box(state.set(PropName::Note, PropValue::Didgeridoo));
+            }
+        });
+    });
+
+    c.bench_function("BlockState::is_liquid", |b| {
+        b.iter(|| {
+            for state in black_box(states) {
+                black_box(state.is_liquid());
+            }
+        });
+    });
+
+    c.bench_function("BlockState::is_opaque", |b| {
+        b.iter(|| {
+            for state in black_box(states) {
+                black_box(state.is_opaque());
+            }
+        })
+    });
+
+    c.bench_function("BlockState::is_replaceable", |b| {
+        b.iter(|| {
+            for state in black_box(states) {
+                black_box(state.is_replaceable());
+            }
+        })
+    });
+
+    c.bench_function("BlockState::luminance", |b| {
+        b.iter(|| {
+            for state in black_box(states) {
+                black_box(state.luminance());
+            }
+        })
+    });
+
+    c.bench_function("BlockKind::to_item_kind", |b| {
+        b.iter(|| {
+            for kind in black_box(BlockKind::ALL) {
+                black_box(kind.to_item_kind());
+            }
+        });
+    });
+
+    c.bench_function("BlockKind::from_item_kind", |b| {
+        b.iter(|| {
+            for kind in black_box(ItemKind::ALL) {
+                black_box(BlockKind::from_item_kind(kind));
+            }
+        });
+    });
+}

valence_protocol/build/block.rs

@@ -2,7 +2,7 @@ use std::collections::BTreeSet;
 
 use heck::{ToPascalCase, ToShoutySnakeCase};
 use proc_macro2::TokenStream;
-use quote::quote;
+use quote::{quote, ToTokens};
 use serde::Deserialize;
 
 use crate::ident;
@@ -80,12 +80,22 @@ pub fn build() -> anyhow::Result<TokenStream> {
     let state_to_kind_arms = blocks
         .iter()
         .map(|b| {
-            let min = b.min_state_id();
-            let max = b.max_state_id();
             let name = ident(b.name.to_pascal_case());
-            quote! {
-                #min..=#max => BlockKind::#name,
+            let mut token_stream = TokenStream::new();
+
+            let min_id = b.min_state_id();
+            let max_id = b.max_state_id();
+
+            if min_id == max_id {
+                quote!(#min_id).to_tokens(&mut token_stream);
+            } else {
+                for id in min_id..max_id {
+                    quote!(#id | ).to_tokens(&mut token_stream);
                 }
+                quote!(#max_id).to_tokens(&mut token_stream);
+            }
+            quote!(=> BlockKind::#name,).to_tokens(&mut token_stream);
+            token_stream
         })
         .collect::<TokenStream>();