rust/hedgewars-engine/src/main.rs
author sheepluva
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extern crate libloading;
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use libloading::{Library, Symbol};
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use std::ops::Deref;
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use std::cmp::{min,max};
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use std::env;
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use getopts::Options;
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use std::io::prelude::*;
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use std::io::{self, Read};
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use std::net::{Shutdown, TcpStream};
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struct EngineInstance {}
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struct Engine<'a> {
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    protocol_version: Symbol<'a, unsafe fn() -> u32>,
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    start_engine: Symbol<'a, unsafe fn() -> *mut EngineInstance>,
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    generate_preview: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, preview: &mut PreviewInfo)>,
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    dispose_preview: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, preview: &mut PreviewInfo)>,
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    cleanup: Symbol<'a, unsafe fn(engine_state: *mut EngineInstance)>,
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    send_ipc: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, buf: *const u8, size: usize)>,
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    read_ipc: Symbol<'a, unsafe fn(engine_state: &mut EngineInstance, buf: *mut u8, size: usize) -> usize>,
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct PreviewInfo {
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  width: u32,
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  height: u32,
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  hedgehogs_number: u8,
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  land: *const u8,
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}
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const PREVIEW_WIDTH: u32 = 256;
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const PREVIEW_HEIGHT: u32 = 128;
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const PREVIEW_NPIXELS: usize = (PREVIEW_WIDTH * PREVIEW_HEIGHT) as usize;
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const SCALE_FACTOR: u32 = 16;
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const VALUE_PER_INPIXEL: u8 = 1;
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/// Resizes the land preview from the library into appropriate format for --preview command.
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///
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/// # Arguments
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///
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/// * `mono_pixels` - Raw pixels of a land preview (monochrome, 0 = empty, else = filled)
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/// * `in_width` - Width of the preview stored in `mono_pixels`
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/// * `in_height` - Height of the preview stored in `mono_pixels`
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/// * `preview_pixels` - Used as **output** for a resized and (kinda) anti-aliased grayscale preview
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fn resize_mono_preview(mono_pixels: &[u8], in_width: u32, in_height: u32, preview_pixels: &mut [u8]) {
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    assert!(mono_pixels.len() == (in_width * in_height) as usize);
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    let v_offset: u32 = max(0, PREVIEW_HEIGHT as i64 - (in_height / SCALE_FACTOR) as i64) as u32;
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    let h_offset: u32 = max(0, (PREVIEW_WIDTH as i64 / 2) - (in_width / SCALE_FACTOR / 2) as i64) as u32;
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    for y in v_offset..PREVIEW_HEIGHT {
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        let in_y = v_offset + (y * SCALE_FACTOR);
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        for x in h_offset..(PREVIEW_WIDTH - h_offset) {
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            let in_x = h_offset + (x * SCALE_FACTOR);
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            let out_px_address = (PREVIEW_WIDTH * y + x) as usize;
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            let mut in_px_address = (in_width * in_y + in_x) as usize;
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            let mut value = 0;
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            for i in 0..SCALE_FACTOR as usize {
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                for j in 0..SCALE_FACTOR as usize {
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                    if (value < 0xff) && (mono_pixels[in_px_address + j] != 0) {
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                        value += VALUE_PER_INPIXEL;
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                    }
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                }
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                in_px_address += in_width as usize;
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            }
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            preview_pixels[out_px_address] = value;
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        }
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    }
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}
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fn main() {
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    let hwlib = Library::new("libhedgewars_engine.so").unwrap();
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    unsafe {
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        let engine = Engine {
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            protocol_version: hwlib.get(b"hedgewars_engine_protocol_version").unwrap(),
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            start_engine: hwlib.get(b"start_engine").unwrap(),
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            generate_preview: hwlib.get(b"generate_preview").unwrap(),
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            dispose_preview: hwlib.get(b"dispose_preview").unwrap(),
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            cleanup: hwlib.get(b"cleanup").unwrap(),
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            send_ipc: hwlib.get(b"send_ipc").unwrap(),
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            read_ipc: hwlib.get(b"read_ipc").unwrap(),
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        };
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        println!("Hedgewars engine, protocol version {}", engine.protocol_version.deref()());
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        let args: Vec<String> = env::args().collect();
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        let mut opts = getopts::Options::new();
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        opts.optflag("", "internal", "[internal]");
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        opts.optflag("", "landpreview", "[internal]");
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        opts.optflag("", "recorder", "[internal]");
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        opts.optopt("", "port", "[internal]", "PORT");
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        opts.optopt("", "user-prefix", "Set the path to the custom data folder to find game content", "PATH_TO_FOLDER");
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        opts.optopt("", "prefix", "Set the path to the system game data folder", "PATH_TO_FOLDER");
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        let matches = match opts.parse(&args[1..]) {
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            Ok(m) => { m }
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            Err(f) => { panic!(f.to_string()) }
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        };
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        let engine_state = &mut *engine.start_engine.deref()();
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        let port: String = matches.opt_str("port").unwrap();
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        println!("PORT: {}", port);
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        if matches.opt_present("landpreview") {
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            let mut stream = TcpStream::connect(format!("127.0.0.1:{}", port)).expect("Failed to connect to IPC port. Feelsbadman.");
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            //stream.write(b"\x01C").unwrap(); // config
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            //stream.write(b"\x01?").unwrap(); // ping
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            let mut buf = [0;1];
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            loop {
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                let bytes_read = stream.read(&mut buf).unwrap();
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                if bytes_read == 0 {
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                    break;
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                }
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                engine.send_ipc.deref()(engine_state, &buf[0], buf.len());
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                // this looks like length 1 is being announced
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                if buf[0] == 1 {
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                    let bytes_read = stream.read(&mut buf).unwrap();
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                    if bytes_read == 0 {
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                        break;
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                    }
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                    if buf[0] == 33 {
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                        println!("Ping? Pong!");
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                        break;
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                    }
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                }
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            };
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            let preview_info = &mut PreviewInfo {
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                width: 0,
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                height: 0,
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                hedgehogs_number: 0,
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                land: std::ptr::null(),
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            };
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            println!("Generating preview...");
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            engine.generate_preview.deref()(engine_state, preview_info);
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            //println!("Preview: w = {}, h = {}, n = {}", preview_info.width, preview_info.height, preview_info.hedgehogs_number);
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            let land_size: usize = (preview_info.width * preview_info.height) as usize;
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            let land_array: &[u8] = std::slice::from_raw_parts(preview_info.land, land_size);
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            const PREVIEW_WIDTH: u32 = 256;
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            const PREVIEW_HEIGHT: u32 = 128;
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            println!("Resizing preview...");
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            let preview_image: &mut [u8] = &mut [0; PREVIEW_NPIXELS];
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            resize_mono_preview(land_array, preview_info.width, preview_info.height, preview_image);
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            println!("Sending preview...");
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            stream.write(preview_image).unwrap();
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            stream.flush().unwrap();
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            stream.write(&[preview_info.hedgehogs_number]).unwrap();
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            stream.flush().unwrap();
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            println!("Preview sent, disconnect");
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            stream.shutdown(Shutdown::Both).expect("IPC shutdown call failed");
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            engine.dispose_preview.deref()(engine_state, preview_info);
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        }
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        engine.cleanup.deref()(engine_state);
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    }
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}