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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 changes from tutorials 0.5 to 31 (excluding 6/7/8/15/24 i.e. shader stuff) and Source Shorts 1 to 18 (excluding 2/7/8/10/15/17 i.e. Multiplayer stuff, using leaked engine code and Fake CSM from celisej567). Multiplayer changes will come eventually. 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

Includes Dynamic RTT Shadows feature from Saul Rennison and Gamepad UI feature from Joshua Ashton / DasMaddi, with some assistance from WadDelZ!

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Linux Issues
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The Gamepad UI doesn't work on Linux, the PostMessageToAllSiblingsOfType function in Panel.h causes errors regarding an incomplete use of the KeyValues class, plus the rest of the Gamepad UI code has issues. As a result, I have disabled the Gamepad UI code from being compiled on Linux until a fix can be implemented. 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 
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If you would like to use the SDK for a commercial purpose, please contact Valve at 
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