Source SDK for Half-Life 1

This repository contains parts of Source SDK 2013 ported to be used with Half-Life 1 (GoldSource) engine. Specifically:

• vstdlib and tier0 (headers) - platform abstraction layer.
• tier1 - Valve's template library, KeyValues and DLL interface.
• tier2 - GoldSrc engine linking library. Exports various engine interfaces.
• vgui_controls - VGUI2 elements.
• steam_api - Steam API. HL1 since SteamPipe update uses API version identical to Source 2013.

You can find engine interfaces in tier2/tier2.h:

• IFileSystem - file system.
• IBaseUI - exported by the engine to the client. Allows to show and hide GameUI and console from client's code.
• IGameUIFuncs - provides some info about the game.
• IEngineVGui - provides access to root panels (see hierarchy in VGUI2 docs).
• IClientVGUI - exported by the client. Used to initialize and control VGUI2 in the client library.

Documentation

Documentation can be found on Valve Developer Community:

• tier1
• VGUI2 basics
• VGUI2 category on VDC
• KeyValues

Credits

• Valve Software (Source SDK)
• SamVanheer (GoldSrc engine reverse engineering).

Integrating into your mod

0. Your mod must use CMake.
1. Add this repo as a submodule.
2. In your main CMakeLists.txt:

   # source_sdk is the directory you cloned this repo to.
   add_subdirectory( source_sdk )

3. The CMakeLists.txt of this project sets following variables in the parent scope:
   • SOURCE_SDK_DEFINES - Add it to client's compile definitions.
   • SOURCE_SDK_INCLUDE_PATHS - Add it to client's include paths.
   • SOURCE_SDK_LIBS - Link the client library with these libs.
4. Implement IClientVGUI. Basic init method should look like this:

    #include <tier0/dbg.h>
    #include <tier1/interface.h>
    #include <tier1/tier1.h>
    #include <tier2/tier2.h>
    
    void CClientVGUI::Initialize(CreateInterfaceFn *pFactories, int iNumFactories)
    {
    	ConnectTier1Libraries(pFactories, iNumFactories);
    	ConnectTier2Libraries(pFactories, iNumFactories);
   
    	if (!vgui2::VGui_InitInterfacesList("CLIENT", pFactories, iNumFactories))
    	{
    		Error("Failed to intialize VGUI2\n");
    		Assert(false);
    	}
    }

   You can now use VGUI2 controls but you should probably create a viewport. Look at source-sdk-2013/mp/src/game/client/game_controls/baseviewport.h and implement something similar.
5. Have fun! :D