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If you use any of these modified files, please give credit to TheMaster974!
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A fork of the 2013 SDK, with additions/modifications from my YouTube videos linked below. This (currently) covers all Singleplayer and Multiplayer changes from tutorials 0.5 to 35 (excluding 6 and 8 i.e. the Source Shader Editor and shader setup stuff) and Source Shorts 1 to 30 (excluding 7/8/15/17 i.e. Mapbase issues, using leaked engine code and Fake CSM from celisej567). Let me know if there are any issues!

Valve Source Code Tutorials can be found here → https://www.youtube.com/playlist?list=PL8tDEPB6h7Lk0YtRtt4k1h_Thgj1ZA2dX

Source Shorts can be found here → https://www.youtube.com/playlist?list=PL8tDEPB6h7LnslIGAYRsmS-wS5MeorktV

Source Shader Editor fork → https://github.com/TheMaster974/source-shader-editor

Includes Dynamic RTT Shadows feature from Saul Rennison, Gamepad UI feature from Joshua Ashton / DasMaddi, Animated Background Menu feature from Jorge "BSVino" Rodriguez and Custom Loading Screen feature from Cvoxalury / sylveonsylvia / Maestra Fénix, with some assistance from WadDelZ!

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Linux Issues
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At the time of updating this readme, Source SDK Base 2013 Singleplayer does NOT work on Linux! I will try to make Valve aware of this issue, for now there is a hacky fix which can be found here: ValveSoftware/portal2#451 (comment)

Also, the Gamepad UI code *can* be compiled on Linux, but only via the 'docker'/'container' method. If you want to enable this, go to the sp/src/vpc_scripts/projects.vgc file and remove the 'WIN32 &&' parts to enable the projects on Linux. I have also performed a few minor changes to some of the files that caused issues on Linux but not on Windows i.e. (client/server)_(hl2/episodic).vpc files.

------------------------------
Source SDK License Information
------------------------------

SOURCE 1 SDK LICENSE

Source SDK Copyright(c) Valve Corp.  

THIS DOCUMENT DESCRIBES A CONTRACT BETWEEN YOU AND VALVE 
CORPORATION ("Valve").  PLEASE READ IT BEFORE DOWNLOADING OR USING 
THE SOURCE ENGINE SDK ("SDK"). BY DOWNLOADING AND/OR USING THE 
SOURCE ENGINE SDK YOU ACCEPT THIS LICENSE. IF YOU DO NOT AGREE TO 
THE TERMS OF THIS LICENSE PLEASE DON’T DOWNLOAD OR USE THE SDK.  

  You may, free of charge, download and use the SDK to develop a modified Valve game 
running on the Source engine.  You may distribute your modified Valve game in source and 
object code form, but only for free. Terms of use for Valve games are found in the Steam 
Subscriber Agreement located here: http://store.steampowered.com/subscriber_agreement/ 

  You may copy, modify, and distribute the SDK and any modifications you make to the 
SDK in source and object code form, but only for free.  Any distribution of this SDK must 
include this LICENSE file and thirdpartylegalnotices.txt.  
 
  Any distribution of the SDK or a substantial portion of the SDK must include the above 
copyright notice and the following: 

    DISCLAIMER OF WARRANTIES.  THE SOURCE SDK AND ANY 
    OTHER MATERIAL DOWNLOADED BY LICENSEE IS PROVIDED 
    "AS IS".  VALVE AND ITS SUPPLIERS DISCLAIM ALL 
    WARRANTIES WITH RESPECT TO THE SDK, EITHER EXPRESS 
    OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED 
    WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, 
    TITLE AND FITNESS FOR A PARTICULAR PURPOSE.  

    LIMITATION OF LIABILITY.  IN NO EVENT SHALL VALVE OR 
    ITS SUPPLIERS BE LIABLE FOR ANY SPECIAL, INCIDENTAL, 
    INDIRECT, OR CONSEQUENTIAL DAMAGES WHATSOEVER 
    (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF 
    BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF 
    BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS) 
    ARISING OUT OF THE USE OF OR INABILITY TO USE THE 
    ENGINE AND/OR THE SDK, EVEN IF VALVE HAS BEEN 
    ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.  
 
       
If you would like to use the SDK for a commercial purpose, please contact Valve at 
sourceengine@valvesoftware.com.