d4r: official NVIDIA DLSS on AMD GPUs under Linux and Proton

NOTICE

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+d4r
+Copyright 2026 countervolts
+
+This product is licensed under the Apache License, Version 2.0 (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; these patches are offered under the same terms.
+
+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.
+
+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 also contain NVIDIA's nvngx_dlss.dll and _nvngx.dll and 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.
+
+This repository contains no NVIDIA software. The NVIDIA DLSS feature library (nvngx_dlss.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.
+
+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.