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path: root/server/replaytool/src/render.rs
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/*
    Hurry Curry! - a game about cooking
    Copyright (C) 2025 Hurry Curry! Contributors

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, version 3 of the License only.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

*/

use crate::replay::replay;
use anyhow::{anyhow, Result};
use log::info;
use rand::random;
use std::{path::PathBuf, str::FromStr};
use tokio::{
    fs::{create_dir_all, remove_dir, remove_file, File},
    io::AsyncWriteExt,
    net::TcpListener,
    process::Command,
};

#[derive(clap::Parser)]
pub struct RenderArgs {
    /// Replay file path
    input: PathBuf,
    /// Output video file path passed to godot (must end in either .avi for MJPEG or .png for PNG sequence)
    output: PathBuf,
    #[arg(short = 'r', long, default_value = "30")]
    framerate: usize,
    #[arg(short = 'R', long, default_value = "1280x720")]
    resolution: String,
    /// Render without display server; Requires wlheadless-run and mutter
    #[arg(short = 'H', long)]
    headless: bool,
    #[arg(long, default_value = "wayland")]
    video_driver: String,
    #[arg(long, default_value = "vulkan")]
    rendering_driver: String,
    #[arg(long, default_value = "mutter")]
    headless_compositor: String,
    #[arg(long, default_value = "/usr/share/hurrycurry/client.pck")]
    client_pck: PathBuf,
}

pub async fn render(a: RenderArgs) -> Result<()> {
    let port = 27090;
    let ws_listener = TcpListener::bind(("127.0.0.1", port)).await?;

    let cwd = PathBuf::from_str("/tmp")
        .unwrap()
        .join(format!("hurrycurry-render-cfg-{:016x}", random::<u64>()));

    let config = {
        let (width, height) = a
            .resolution
            .split_once("x")
            .ok_or(anyhow!("resolution malformed"))?;
        format!(
            r#"config_version=5
[display]
window/size/viewport_width={width}
window/size/viewport_height={height}
"#,
        )
    };

    create_dir_all(&cwd).await?;
    File::create(cwd.join("override.cfg"))
        .await?
        .write_all(config.as_bytes())
        .await?;

    #[cfg(unix)]
    tokio::fs::symlink(&a.client_pck, cwd.join("client.pck")).await?;
    #[cfg(not(unix))]
    tokio::fs::copy(&a.client_pck, cwd.join("client.pck")).await?;

    let mut args = Vec::new();
    if a.headless {
        args.push("wlheadless-run");
        args.extend(["-c", &a.headless_compositor]);
        args.push("--");
    }
    if a.headless && a.video_driver == "x11" {
        args.push("xwayland-run");
        args.push("--");
    }
    args.push("godot");
    let main_pack = cwd.join("client.pck");
    let main_pack = main_pack.to_str().unwrap();
    args.extend(["--main-pack", main_pack]);
    if a.headless {
        args.extend(["--video-driver", &a.video_driver]);
        args.extend(["--rendering-driver", &a.rendering_driver]);
    }
    args.extend(["--write-movie", a.output.to_str().unwrap()]);
    let fps = a.framerate.to_string();
    args.extend(["--fixed-fps", &fps]);
    args.push("--print-fps");
    args.push("--");
    let uri = format!("ws://127.0.0.1:{port}");
    args.push(&uri);

    info!("using commandline {:?}", args.join(" "));
    let mut client = Command::new(args[0]).args(&args[1..]).spawn()?;

    info!("listening for websockets on {}", ws_listener.local_addr()?);
    replay(&ws_listener, &a.input).await?;

    client.wait().await?.exit_ok()?;

    remove_file(cwd.join("override.cfg")).await?;
    remove_file(cwd.join("client.pck")).await?;
    remove_dir(cwd).await?;

    Ok(())
}