Implement multithreading in voxel-mesh manager, and cleanup.

- Disable thin LTO due to rust-lang/rust#81408
- Pin shaderc to 0.7.3 due to linker errors with newer version.
- Update dependencies.

Author: Gohla

.run/FB voxel_meshing -- Standalone-MC.run.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="FB voxel_meshing -- Standalone-MC" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="command" value="bench --package voxel_meshing --profile fastbench -- Standalone-MC" />
+    <option name="command" value="bench --package voxel_meshing --profile=fastbench -- Standalone-MC" />
     <option name="workingDirectory" value="file://$PROJECT_DIR$" />
     <option name="channel" value="DEFAULT" />
     <option name="requiredFeatures" value="false" />

.run/FB voxel_meshing -- Standalone-Sphere.run.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="FB voxel_meshing -- Standalone-Sphere" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="command" value="bench --package voxel_meshing --profile fastbench -- Standalone-Sphere" />
+    <option name="command" value="bench --package voxel_meshing --profile=fastbench -- Standalone-Sphere" />
     <option name="workingDirectory" value="file://$PROJECT_DIR$" />
     <option name="channel" value="DEFAULT" />
     <option name="requiredFeatures" value="false" />

.run/RR voxel_meshing.run.xml

@@ -12,7 +12,8 @@ default-members = [
 ]
 resolver = "2"
 
-# Development profile: no debug information, some optimisations.
+
+# Development profile: no debug information, some optimisations. Very low compile-time.
 [profile.dev]
 opt-level = 2
 debug = false
@@ -29,11 +30,12 @@ overflow-checks = true
 debug-assertions = true
 incremental = true
 
-# Testing: same as development profile.
+# Testing: same as development profile. Very low compile-time.
 [profile.test]
 inherits = "dev"
 
-# Debug profile: full debug information, no optimisations.
+
+# Debug profile: full debug information, no optimisations. Low compile-time.
 [profile.dbg]
 inherits = "dev"
 opt-level = 0
@@ -51,7 +53,8 @@ overflow-checks = true
 debug-assertions = true
 incremental = true
 
-# Release profile: full optimisations, including full LTO.
+
+# Release profile: full optimisations, including full LTO. High compile-time.
 [profile.release]
 opt-level = 3
 debug = false
@@ -60,18 +63,29 @@ debug-assertions = false
 lto = true
 panic = "abort"
 
-# Benchmarking profile: full optimisations, including full LTO.
+# Fast iteration release profile: full optimisations, but without LTO. Medium compile-time.
+[profile.fastrelease]
+inherits = "release"
+incremental = true
+codegen-units = 256
+lto = false
+
+
+# Benchmarking profile = release. High compile-time.
 [profile.bench]
 inherits = "release"
 
-# Fast benchmarking profile: full optimisations, but with thin LTO and incrementality enabled.
+# Fast iteration benchmarking profile = fastrelease. Medium compile-time
 [profile.fastbench]
-inherits = "release"
-incremental = true
-codegen-units = 256
-lto = "thin"
+inherits = "fastrelease"
 
-# Performance profiling profile: full debug information, full optimisations.
+
+# Performance profiling profile = release + debug. High compile-time.
 [profile.profile]
 inherits = "release"
 debug = true
+
+# Fast iteration performance profiling profile = fastrelease + debug. Medium compile-time
+[profile.fastprofile]
+inherits = "fastrelease"
+debug = true

Cargo.lock

@@ -6,5 +6,6 @@ edition = "2021"
 publish = false
 
 [dependencies]
-shaderc = "0.7"
+shaderc = "=0.7.3"
+shaderc-sys = "=0.7.3"
 walkdir = "2.3"