AMD released FidelityFX Super Resolution (FSR) on June 22nd with support for just 7 games with support for a further 12 games coming soon. The FidelityFX Super Resolution technology is now available in Grand Theft Auto 5 via a mod created by NarutoUA. The mod replaces the game's internal upscaler which means that FSR profiles can be selected by changing the Frame Scaling Mode found in Advanced Graphics Settings. AMD has promised to make the FSR technology open-source however this is yet to have happened so the modder used a precompiled shader binary from a game with native FSR support. You can find a comparison video showing the mod down below. The source code for the mod has been uploaded to GitHub where it can be reviewed and manually compiled.
Demonstration Video
View at TechPowerUp Main Site
Demonstration Video
View at TechPowerUp Main Site