I am making sourcemod in SDK 2013 branch and I want to improve Source graphic a bit so i installed ReShade but then i realised something is wrong with AO, so i started to tweak settings with another depth buffers, disabling HUD...
But, i found a way to fix it a bit, that why i wanted to create this tutorial :D

So you want to have this?
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No Problem! Follow my steps to fix messed DepthBuffer

Why i need DepthBuffer for ReShade?:

• In easy words it has "informations" about depth on your ingame screen ( how far props/walls/sky is from player`s camera ) and ReShade needs these informations for SSAO, Depth Of Field and all depth related shaders

Why DepthBuffer in Source is "broken" for ReShade?:

• VGUI ( HUD elements: health, ammo, crosshair ) makes it solid color so it has no depth information. You can fix it by typing r_drawvgui 0 in console ( but who wants to play without HUD ? ) or by choosing right Depth Buffer from DX9 Tab in ReShade but it still needs some fixes
  
  
• MSAA makes it solid color aswell so you need to disable Antialiasing in game options ( but you can enable Anti-Aliasing in ReShade so git gut )
  
  
• When 3D Skybox is enabled ( it usually is ) DepthBuffer will flicker ( switching between playable area and 3D Skybox`s architecture ) when player is moving and looking around ( from what i saw it switch when your crosshair is on hidden 3D Skybox area but not always ) so you need to disable 3D Skybox architecture by typing r_3dsky 0 in console or SSAO will turns ON and OFF on player`s movement
  
  
• Color Correction can make it solid sometimes, so turn it OFF ( but in my case i can have it enabled and everything is fine )

NOTE: There are just some tricks to make it work. It is not a full DepthBuffer repair and they have also some cons! You need to disable 3D Skybox or DepthBuffer will flickers when you are moving! I have not found any solution for this yet. If you have a solution to keep 3D Skybox enabled, write a comment. Thank you :D

I will show you how to make it work for Half-Life 2, but it should works for all Source Engine games/mods in most cases.

You can download it here: https://reshade.me/

> Open ReShade Setup

> Click Select game to install

> Find your game .exe ( hl2.exe in most cases ) it should be in C:\Program Files (x86)\Steam\steamapps\common\half-life 2 by default ( or in your Source SDK Base if you are working with source mod ) and click on it

> Check "Direct3D 9" API below in ReShade setup

> When window Do you want do download collection... shows up, click YES and Check All effects so you can tweak with some cool settings later

> Open your game folder ( folder where you installed ReShade and where hl2.exe is )

> Copy these files:

• reshade-shaders folder
  
• d3d9.dll
  
• ReShade.ini

> Paste them in your game "bin" folder hl2/bin ( "bin" folder is in same place where hl2.exe is ) or in Source SDK Base/bin if you have a sourcemod

> Run your game

> You should see that ReShade is working if you see it on top

> First of all open Options --> Video --> Advanced: Turn Anti-Aliasing to None and Disable Color Correction

> Load any map

> Click "Home" key to open ReShade

> Tutorial will appear, you can read this or just Skip Tutorial

> In ReShade window go to Home tab ( it is on top )
Next
> Create your own Preset by clicking " + " on the right and write name for your Preset ( you should not use DefaultPreset )
Next
> In Home tab find DisplayDepth [DisplayDepth.fx] and active it
Next
> Go to DX9 tab and active Copy Depth Buffers Before Clear Operation
You can see something is going on

Left: Normal map ( is reversed )
Right: Depth map ( still broken, only view model is visible )

Next
> Go back to DisplayDepth in Home tab and change RESHADE_DEPTH_INPUT_IS_REVERSED from 1 to 0

Next
> Click Edit global preprocessor definitions you should have here RESHADE_DEPTH_INPUT_IS_REVERSED 0, but if there is nothing, in Current Preset ( or Global if you want to have many presets ) click on "+" and in first window write RESHADE_DEPTH_INPUT_IS_REVERSED and in second window 0 and then click Reload on bottom

> You can deactive DisplayDepth [DisplayDepth.fx] now

> We are almost done! Go back to Home tab, find MXAO [MXAO.fx] and active it
Next
> AO will flickers sometimes, so you need to disable 3D Skybox. Write r_3dsky 0 in console
Maybe someone will find solution for this :D

And you have fixed DepthBuffer! You can tweak with MXAO settings or active another depth related shader like Depth Of Field --> DOF.fx shaders, active FXAA.fx to have Anti-Aliasing

In MXAO there is not a big difference between Medium AO quality and higher and my fps stay the same on my PC when its on Medium, but when on Maximum i lose 100fps and i barely see any visual quality in FullHD resolution, so not worth for me go higher than medium :D

( Sorry for my poor english :D )