Update the old. A love letter to Source Engine and Valve Software.

Source code is based on TF2 branch's 2018 leak. Don't use it for commercial purposes, as it contains a proprietary stuff that wasn't meant to be open-sourced.

Why Engine leak and not SDK?

Because SDK does not allow to make huge changes.

This project is using waf buildsystem. If you have waf-related questions look https://waf.io/book

Features

Inherited

• Android, macOS, FreeBSD, Windows, Linux (glibc, musl) support
• ARM support (except windows)
• 64bit support
• Partial support of modern toolchains
• Fixed many undefined behaviors
• Touchscreen support (even on windows/linux/osx)
• VTF 7.5 support
• PBR materials
• BSP v19-20 with partial v21 support.
• MDL v46-49 support
• Removed useless/unnecessary dependencies
• Achivements work without Steam
• Fixed many bugs
• Server Browser now works without Steam

defun

• SDL3 support (located in SDL3-attempt branch) (Input partially works)
• Fresh viewmodel bob
• Increase map size limits
• Get rid of useless stuff like telemetry (Partially done now)
• Replace proprietary code with open source solutions
• Deferred lighting/shading (First attempt did not compile successfully, need to try again later)
• Port some utilities to Linux and get them interface! (Might not be easy as i thought)

ooh... Good luck with that!

take the following with grain of salt, as some of those might never get realized.

• Replace VGUI2 with RmlUI/Custom GUI
• FMOD support
• Replace DirectX with Vulkan!
• Change VMT syntax!
• Replace VTF with PNG/WEBP!
• Get rid of brushes and convert to mesh-based world (May require next feature)!!
• Replace MDL with GLB and BSP with GLTF (Requires previous feature)!!!
• Replace Hammer's UI with GTK4 and PORT TO LINUX!!!!

Building instructions

Linux

Packages (For Debian distributions)

• Install python3 libsdl3-dev libfreetype6-dev libfontconfig1-dev libopenal-dev libjpeg-dev libpng-dev libcurl4-openssl-dev libbz2-dev libedit-dev. If you want a voice chat support, install libopus-dev and then add --enable-opus argument to WAF.

Packages (For Arch distributions)

Install git python gcc gcc-multilib sdl3 freetype2 fontconfig zlib bzip2 libjpeg libpng curl openal opus.

Compile and run

1. Execute ./waf.py configure -T release/debug (choose one of the release or debug!). In case of errors inspect what went wrong and try to solve it.
2. After configuration is done successfully, run ./waf.py build and wait for it to compile and link. In case of errors, you can try:
   • Reverting to the previous commit
   • Wait for the next one, or...
   • Grab a stable source code release from "Releases", when available.
3. We will now proceed to put them in a structure similar to all of the Source Engine games. Write in terminal ./waf.py install --destdir= and then write the path of where you want it to be. Put path around quotes in case it has spaces.
4. Now put your preferred game into the installed path. *DO NOT COPY YOUR PREFERRED GAME "bin" FOLDER'S .so FILES!
5. Now go into the installed path, and run "SourceDEFUN".

FreeBSD (needs contributor!)

Required dependencies

1. Use pkg ins python sdl2 freetype2 fontconfig curl pkgconf openal-soft jpeg-turbo png.
2. Now, Follow instructions for all OS that has label "(needs contributor!)".

Android (on Linux)

1. Download and extract Android NDK r10e from here.
2. Download and extract Clang 11 from GitHub or from apt.llvm.org.
3. Run export ANDROID_NDK_HOME="PATH/TO/NDK/android-ndk-r10e" and export PATH="PATH/TO/CLANG/bin:$PATH" or export PATH="/usr/lib/llvm-11/bin:$PATH" if you're using llvm.sh.
4. Add to WAF argument --togles --android=armeabi-v7a-hard,host,21. armeabi-v7a-hard can be replaced with aarch64 for arm64 build, but you need to add --64bits argument. You can check your architecture by executing uname -m in Termux.

macOS (needs contributor!)

Preparing

1. Install Xcode frop App Store.
2. Install Xcode build tools with xcode-select --install command.
3. Install HomeBrew.

Required dependencies

1. Run brew install sdl2 freetype2 fontconfig pkg-config opus libpng libedit
2. Now, Follow instructions for all OS that has label "(needs contributor!)".

Windows (needs contributor!)

1. Install MSVC 15.9 and Windows SDK from Visual Studio Installer. Or you can install full version of Visual Studio 2017 and use his MSVC 15.9.
2. Install Python 3 and add it to Path.
3. Build works for some reason only in PowerShell.
4. Now, Follow instructions for all OS that has label "(needs contributor!)".

For all OS that has label "(needs contributor!)":

1. You need to install Python 3 in order to use a WAF build system.
2. Run waf.py configure -T release/debug (choose one of the release or debug!)
3. On windows, run waf.bat.
4. If waf says something like /usr/bin/env: 'python': No such file or directory use python3 prefix before ./waf.py.

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To compile as Dedicated server, just add -d, while configuring engine.

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