GTA IV has always been subject to technical problems ever since its launch. Everyone who purchased the game was satisfied with the game play but experienced issues with game stability and performance. Some of us were also unhappy about the fact that GTA IV did not support Anti-aliasing (FSAA).
Well, I came across a thread on xtremesystems that allows you to enable FXAA in GTA IV and several other games like Mafia II, World of Tanks, Deadspace, Shift 2, etc. It’s a small patch that allows you to play games with FXAA. It supports three DirectX platforms- DX 9, DX 10, DX 11. However, not all games may be supported.
Before using the patch- GTA IV without AA
After using patch- GTA IV with FXAA
How to install the patch to enable FXAA in games?
For a DirectX 9 game, copy all the files from d3d9 directory into the directory containing the game executable.
For a DirectX 10/11, copy all the files from the d3d10 directory into the directory containing the game executable.
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