Antialiasing with DXVK and GTA IV

This guide may be useful only for 1.0.4.0 or older versions of the game. For later versions including 2020 Complete Edition you should try FusionFix which has many more native AA settings.

The antialiasing method described below is very simple and uses older Sweetfx that is based on injectSMAA. 

• SweetFX antialiasing works for fairly modern GPUs e.g. very good at rx580, OK at gt730. 
• It is not CPU hungry and works without significant fps degradation even on 2-core Athlon X2. 

Latest Reshade may also be used for Vulkan antialiasing but it is harder to install/configure and at the moment it works only in global mode e.g. it will affect all games that output through Vulkan. 

How-to enable DXVK antialiasing

1. Get  SweetFX 1.5u Boulotaur2024.Injector that will chainload DXVK dll
2. Rename DXVK dlls installed in game folder:
   d3d9.dll as d3d9_dxvk.dll
   dxgi.dll as dxgi_dxvk.dll
3. Unpack downloaded SweetFX archive and copy everything except X64_dll's into game folder:
• SweetFX subfolder
• d3d9.dll
• SweetFX_preset.txt
• SweetFX_settings.txt
4.  Edit SweetFX_settings.txt "Misc settings" section at the end and specify your renamed DXVK dll here as:
   
   // external_d3d9_wrapper = d3d9_dxvk.dll
   
   ATTENTION! The line must remain commented with // and it is not a mistake!
5. Launch the game

Once in the game you may use following  keys

• Ins - enable/disable SweetFx. By default it is enabled on startup.
  
• End - screenshot
  
• Del - reload SweetFX

To check if AA works come up to any table in Niko's apartment and press Ins to disable AA - you should see jaggies appear at the edges of the table, press Ins once again to reenable AA.

 

Troubleshooting

If the game freezes on startup it may be because of SweetFX+DXVK initialization -  press Del to reload it and the game should launch. 

If the game shows D3D9 error try renaming dxgi.dll from SweetFX as dxgi_sweetfx.dll