d4r
Copyright 2026 countervolts and the d4r contributors
Modified in this fork for CUDA Ray Reconstruction support and validation (2026).

This product is licensed under the GNU General Public License, version 3 only
(GPL-3.0-only; see LICENSE), except for the files
listed below.

patches/zluda/*.patch
    Changes to ZLUDA (https://github.com/vosen/ZLUDA). ZLUDA is dual-licensed under the Apache
    License, Version 2.0 and the MIT license; the ZLUDA portions of these patches are offered
    under the same terms. Changes to LLVM within these patches retain the Apache License,
    Version 2.0 with LLVM exceptions.

patches/vkd3d-proton/*.patch
    Changes to vkd3d-proton (https://github.com/HansKristian-Work/vkd3d-proton), which is licensed
    under the GNU Lesser General Public License, version 2.1. These patches are offered under the
    same license.

third_party/fidelityfx/
    AMD FidelityFX SDK 2.3.0 API headers (ffx_api.h, ffx_api_types.h, ffx_denoiser.h), copied
    unmodified; the SDK license lists them under the MIT license (third_party/fidelityfx/LICENSE.txt).
    AMD's runtime DLLs are not included and remain under AMD's binary terms.

kernels/support/fsr_rr_prepare.comp
    Its diffuse/specular split follows the DLSS-RR to FSR-RR adapter in Zach Hembree's OptiScaler
    branch ffx-denoise-experimental and burak113's continuation (GPL-3.0).

Release zips (scripts/package_release.sh) also bundle binaries of ZLUDA (Apache-2.0 or MIT, with
LLVM under Apache-2.0 with LLVM exceptions), the patched vkd3d-proton (LGPL-2.1) and OptiScaler
(https://github.com/optiscaler/OptiScaler, GPL-3.0, unmodified). Each zip carries their license
texts in d4r/licenses and says where every file comes from in d4r/source/SOURCES.txt.
Release zips include install.sh to download NVIDIA's nvngx_dlss.dll and _nvngx.dll separately.
Optional builds may bundle those DLLs and nvngx_dlssd.dll. Release zips also include DLSS kernels compiled from NVIDIA's
PTX. Those are NVIDIA's property, are not covered by this repository's license, and are included
by whoever publishes the zip. Downloaded DLLs remain governed by NVIDIA's license terms.

This repository contains no NVIDIA software. The NVIDIA DLSS feature libraries (nvngx_dlss.dll and
nvngx_dlssd.dll) and the NGX core (_nvngx.dll) are NVIDIA's; you supply your own copies, and their use is governed by
NVIDIA's license terms. At build time, kernels/tools/extract_dlss_ptx.py reads PTX from your copy
of nvngx_dlss.dll into kernels/extracted/, which is not part of the repository and must not be
redistributed. The same holds for the model files the native engine's tools write (engine/README.md):
weights.bin, offsets.bin, lut.bin, hipnet.bin and model.json hold values read from NVIDIA's DLSS.

NVIDIA and DLSS are trademarks of NVIDIA Corporation. AMD, Radeon and FSR are trademarks of
Advanced Micro Devices, Inc. This project is not affiliated with or endorsed by either company.