mmap the bsp

Cargo.lock

@@ -1481,6 +1481,15 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "mmarinus"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f001c2c323e765b22d8248a0b8a7f8f66672a007babf01c380b579cc71e862c"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "native-tls"
 version = "0.2.8"
@@ -2676,6 +2685,7 @@ dependencies = [
  "delaunator",
  "itertools",
  "miette",
+ "mmarinus",
  "steamlocate",
  "thiserror",
  "three-d",

Cargo.toml

@@ -19,6 +19,7 @@ tracing = "0.1.29"
 tracing-subscriber = { version = "0.3.3", features = ["env-filter"] }
 tracing-tree = "0.2.0"
 cgmath = "0.18.0"
+mmarinus = "0.2.1"
 
 [profile.dev.package."*"]
 opt-level = 2

src/main.rs

@@ -5,7 +5,8 @@ use camera::FirstPerson;
 use itertools::Either;
 use loader::Loader;
 use std::env::args;
-use std::fs;
+use std::path::Path;
+use std::time::Instant;
 use thiserror::Error;
 use three_d::*;
 use tracing_subscriber::{prelude::*, EnvFilter};
@@ -72,13 +73,9 @@ fn main() -> Result<(), Error> {
         ..Default::default()
     })?;
 
-    let data = fs::read(&file)?;
-    let bsp = Bsp::read(&data)?;
-    let world_model = bsp.models().next().ok_or(Error::Other("No world model"))?;
-
     let context = window.gl().unwrap();
 
-    let cpu_mesh = model_to_mesh(world_model);
+    let (cpu_mesh, bsp) = load_world(file.as_ref())?;
     let forward_pipeline = ForwardPipeline::new(&context).unwrap();
     let mut camera = Camera::new_perspective(
         &context,
@@ -360,6 +357,16 @@ fn prop_to_mesh(model: &vmdl::Model) -> CPUMesh {
     mesh
 }
 
+fn load_world(path: &Path) -> Result<(CPUMesh, Bsp), Error> {
+    use mmarinus::{perms, Kind};
+
+    let map = Kind::Private.load::<perms::Read, _>(path).unwrap();
+    let bsp = Bsp::read(map.as_ref())?;
+    let world_model = bsp.models().next().ok_or(Error::Other("No world model"))?;
+
+    Ok((model_to_mesh(world_model), bsp))
+}
+
 fn merge_meshes<I: IntoIterator<Item = CPUMesh>>(meshes: I) -> CPUMesh {
     let mut positions = Vec::new();
     let mut normals = Vec::new();