Module headless 

Running a game with no window, for tools and tests.

A Session owns a game and an offscreen target, and advances it one frame at a time: no window, no event loop, no presentation. It draws exactly as a window would, and one stream of moves drives both the controls the game reads and its UI.

Needs the offscreen feature, native only and off by default; absent on wasm32.

use mirage_engine::headless::Session;
use mirage_engine::prelude::*;

let mut session = Session::new(Config::new("probe"), UVec2::new(320, 200), |_ctx| Ok(Probe))?;

for _ in 0..60 {
    let started = std::time::Instant::now();
    let stats = session.step();
    println!("{} draws took {:?}", stats.draw_calls(), started.elapsed());
}

let pixels = session.pixels()?;
assert_eq!(pixels.len(), 320 * 200 * 4);

Re-exports

pub use crate::input::Switch;

Structs

FrameStats

Counts one Session::step turned the game’s draws into.

Session

A game running against an offscreen target, one frame per Session::step.