gasm_host/
session.rs

1//! A game ready to start: the module, its assets, parameters, storage and load
2//! options. [`crate::headless::run`] and `window::run` (feature `window`) drive it.
3
4use std::collections::HashMap;
5use std::time::Instant;
6
7use crate::assets::Assets;
8use crate::audio::AudioOut;
9use crate::angle::Angle;
10use crate::gfx::Gfx;
11use crate::host::{Game, Host, LoadOptions, Stop};
12use crate::net::Net;
13use crate::storage::Storage;
14
15pub struct Session {
16    /// shown in logs and the window title
17    pub name: String,
18    /// a .wasm module, or a .cwasm if `load.allow_precompiled`
19    pub wasm: Vec<u8>,
20    pub assets: Assets,
21    pub params: HashMap<String, String>,
22    pub allow_net: bool,
23    pub storage: Storage,
24    pub load: LoadOptions,
25    /// where ANGLE is (gasm:gl games): None searches the usual places (`angle::find`)
26    pub gl_lib: Option<std::path::PathBuf>,
27    /// gasm:gl on SwiftShader (software Vulkan) instead of the GPU
28    pub gl_software: bool,
29}
30
31impl Session {
32    /// Whether the game imports gasm:gl (it then needs ANGLE to draw).
33    pub fn uses_gl(&self) -> bool {
34        crate::host::imports_module(&self.wasm, "gasm:gl", self.load.allow_precompiled)
35    }
36
37    /// ANGLE for this session's gasm:gl game: offscreen at `w`×`h`, or in a window.
38    pub fn open_gl(&self, window: Option<crate::angle::NativeWindow>, size: (u32, u32)) -> Result<Angle, String> {
39        let dir = crate::angle::find(self.gl_lib.as_deref())?;
40        let open = |software| match window {
41            Some(w) => Angle::window(&dir, w, software),
42            None => Angle::offscreen(&dir, size.0, size.1, software),
43        };
44        match open(self.gl_software) {
45            // no usable GPU (or driver): SwiftShader
46            Err(e) if !self.gl_software => {
47                eprintln!("[gasm] gl: {e}; trying SwiftShader (software)");
48                open(true)
49            }
50            r => r,
51        }
52    }
53
54    /// Instantiate the guest and run its init. `reproducible`: headless rules
55    /// (virtual time, fixed random sequence, hashing). `gl`: the GL that executes a
56    /// gasm:gl guest's calls (None: the null GL).
57    pub fn start(self, audio: Option<Box<dyn AudioOut>>, gfx: Gfx, gl: Option<Angle>, reproducible: bool, hashing: bool) -> Result<Game, Stop> {
58        let mut host = Host::new(self.assets, self.params, audio, gfx, Net::new(self.allow_net), self.storage);
59        if let Some(a) = gl {
60            eprintln!("[gasm] gl: {}", a.renderer);
61            host.gl.attach(a);
62        }
63        if reproducible {
64            host.set_reproducible();
65        }
66        host.hashing = hashing;
67        let t0 = Instant::now();
68        let game = Game::load(&self.wasm, host, self.load)?;
69        eprintln!("[gasm] loaded {} in {:.0} ms", self.name, t0.elapsed().as_secs_f64() * 1000.0);
70        Ok(game)
71    }
72}
gasm_host/session.rs

gasm_host/
session.rs
