AMD Leaked the Source Code for FSR 4: the Consequences Are Already Irreversible

AMD accidentally made the source code for its FSR 4 super-resolution technology available. This happened after the release of FidelityFX SDK 2.0, which mistakenly included internal project files. Although the repository was quickly removed, some of the data remained accessible for several hours, and users managed to create their own forks.

What Was Discovered in the Code

The leaked materials mention a version of FSR 4 with INT8 support, but it appears to be incomplete. It is unclear whether this version was intended for actual hardware or was merely an experiment. AMD had previously confirmed working with RDNA3 and testing new features, but without any official guarantees.

Comparison of Openness Approaches

Today, the status of super-resolution technologies looks like this:

• AMD: FSR1, FSR2, and FSR3 are open source, while FSR4/Redstone was not originally planned to be open source.
• NVIDIA: all versions of DLSS remain closed.
• Intel: XeSS promised to open source, but never did.

Against this backdrop, the community is discussing whether AMD should officially release FSR 4. The company has previously demonstrated openness with previous generations, and many developers expected this practice to continue.

Why Revoking the License Is Impossible

The files that became publicly available were distributed under the MIT license. This means that users have already obtained the right to use, modify, and distribute the code. Even after the repository is deleted, the license remains valid, and AMD cannot revoke it. An exception is possible only if the developer did not originally have the rights to the code, but this is not the case here.