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🌊 A capable pixelflut server written in Rust 🦀

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# 🌊 Wellenbrecher 🌊

A capable [pixelflut](https://github.com/defnull/pixelflut) server written in Rust 🦀

## But is it fast?

**Yes**, but [#1](https://github.com/bits0rcerer/wellenbrecher/issues/1)

#### Comparison (out-dated/incomplete)

<details>
  <summary>Test machine</summary>

```neofetch
                    -`                    bits0rcerer@bench
                   .o+`                   ----------------------
                  `ooo/                   OS: Arch Linux x86_64
                 `+oooo:                  Host: Alder Lake-H PCH (ERYING G660 ITX) E1.0G
                `+oooooo:                 Kernel: 6.6.3-arch1-1
                -+oooooo+:                Pixelflut Canvas: 1280x720
              `/:-:++oooo+:               CPU: 12th Gen Intel i5-12500H (16) @ 4.500GHz
             `/++++/+++++++:              GPU: Intel Alder Lake-P GT2 [Iris Xe Graphics]
            `/++++++++++++++:             Memory: 16GiB
           `/+++ooooooooooooo/`           NIC: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+
          ./ooosssso++osssssso+`          Kernel parameter: ... mitigations=off ...
         .oossssso-````/ossssss+`
        -osssssso.      :ssssssso.
       :osssssss/        osssso+++.
      /ossssssss/        +ssssooo/-                               
    `/ossssso+/:-        -:/+osssso+-
   `+sso+:-`                 `.-/+oso:
  `++:.                           `-/+/
  .`                                 `/
  ```

</details>

|                                                                          | tsunami¹ - 1 connection | tsunami¹ - 8 connection | tsunami¹ - 16 connection | tsunami¹ - 24 connection | tsunami¹ - 256 connection |
|--------------------------------------------------------------------------|-------------------------|-------------------------|--------------------------|--------------------------|---------------------------|
| wellenbrecher                                                            | **5.8 Gbit/s**          | **22.3 Gbit/s**         | **23.7 Gbit/s**          | **23.7 Gbit/s**          | **23.6 Gbit/s**           |
| [shoreline](https://github.com/TobleMiner/shoreline)                     | 2.8 Gbit/s              | 9.8 Gbit/s              | 12.8 Gbit/s              | 10.2 Gbit/s              | 16.0 Gbit/s               |
| wellenbrecher - single thread                                            | **5.8 Gbit/s**          | 5.5 Gbit/s              | 5.5 Gbit/s               | 5.5 Gbit/s               | 5.4 Gbit/s                |
| [shoreline](https://github.com/TobleMiner/shoreline)     - single thread | 2.8 Gbit/s              | 7.0 Gbit/s              | 9.5 Gbit/s               | 8.8 Gbit/s               | 9.8 Gbit/s                |
| [pixelnuke](https://github.com/defnull/pixelflut#pixelnuke-c-server)     | 1.7 Gbit/s              | 1.7 Gbit/s              | 1.7 Gbit/s               | 1.7 Gbit/s               | 1.6 Gbit/s                |

¹[`tsunami`](https://github.com/bits0rcerer/tsunami) - my pixelflut client

## What's in the box?

### `wellenbrecher`

The **core**, handling connections and processing commands.

```
Usage: wellenbrecher [OPTIONS]

Options:
      --width <WIDTH>       Canvas width [env: CANVAS_WIDTH=] [default: 1280]
      --height <HEIGHT>     Canvas height [env: CANVAS_HEIGHT=] [default: 720]
  -n, --threads <THREADS>   Limit the number of OS threads [env: WELLENBRECHER_THREAD_LIMIT=]
  -c, --connections-per-ip <CONNECTIONS_PER_IP> Limit connections per ip
  ...
  -h, --help
  ...
```

💡
Wellenbrecher creates a shared memory region that is accessed by all components to share the canvas.
This shared memory region is persistent in RAM.

You can remove the canvas (and free the memory) with:

```bash
wellenbrecher --remove-canvas [--canvas-file-link <CANVAS_FILE_LINK>]
```

### `seebruecke`

Frontend to view the canvas.

```
Usage: seebruecke [OPTIONS]

Options:
      --gpu-index <GPU_INDEX>   GPU Index [env: SEEBRUECKE_GPU=] [default: 0]
      --list-gpus               List available GPUs
  -f, --fullscreen              Start in fullscreen mode [env: SEEBRUECKE_FULLSCREEN=]
  -l, --canvas-file-link <CANVAS_FILE_LINK> 
          Canvas shared memory file link [env: WELLENBRECHER_CANVAS_FLINK=] [default: /tmp/wellenbrecher-canvas]
  -h, --help
  ```

- `Esc` Exit
- `Up`/`Down` Select a user for highlighting
- `R` reset highlighting
- `Left`/`Right` Adjust highlighting strength

### `gst-wellenbrecher-src`

[GStreamer](https://gstreamer.freedesktop.org/) source to stream the canvas.

```bash
cargo build --package gst-wellenbrecher-src --release
GST_PLUGIN_PATH=$(pwd)/target/release

gst-launch-1.0 wbsrc ! videoconvert ! autovideosink
  ```

## Requirements

- `wellenbrecher`
    - Rust nightly
    - Linux kernel with io_uring

- `seebruecke`
    - see [wgpu supported platforms](https://github.com/gfx-rs/wgpu#supported-platforms)

- `gst-wellenbrecher-src`
  - [GStreamer](https://gstreamer.freedesktop.org/)

The canvas is shared via shared memory

## Live on stage

### 37C3

</details>

# Special thanks to

> /pixelnuke (C server)
>
> Server written in C, based on libevent2, OpenGL, GLFW and pthreads. It won't get any faster than this.
> Perfect for fast networks and large groups.
>
> ~ <cite>[defnull](https://github.com/defnull), [Mar 2018](https://github.com/defnull/pixelflut/commit/51143d90ed0631293be1d48565874c44515c0dee)</cite>

> Pixelflut - Multiplayer canvas
>
> Pixelflut is a very simple (and inefficient) ASCII based network protocol to draw pixels on a shared screen.
> It works great as a group activity for novice programmers due to it's low entry barrier, or as an interactive and
> very chaotic art installation at hacker events. If you have a beamer or LED wall, a solid network, and a bunch of
> hackers, give it a try. It's fun.
>
> The idea was born at EasterHegg 2014 and evolved into a recurring part of most CCC events since then.
> Pixelflut really developed it's own live and now there are dozens of server and client implementations available.
> Reddit came up with a similar idea in 2017 with /r/place and scaled it to thousands of global users.
>
> - [cccgoe.de/wiki/Pixelflut](https://cccgoe.de/wiki/Pixelflut)
> - [github.com/defnull/pixelflut](https://github.com/defnull/pixelflut)
>
> ~ <cite>[defnull](https://defnull.de/about.html)</cite>

## ❤️ all the creatures fluting pixels with me

wellenbrecher

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