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ZLUDA: read null texture objects as zero (fixes Ghost of Tsushima GPU fault)

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ayo committed 2026-09-27 16:53:22 -04:00
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commit 629bc35e9d
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docs/building.md
+3 -2
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@@ -4,7 +4,7 @@ These steps produce the pieces the launcher needs: a patched ZLUDA, a patched vk
| Component | Tested version |
|---|---|
| ZLUDA | `ee2f25a` (upstream), plus `patches/zluda/0002`, `0003`, `0004` in that order |
| ZLUDA | `ee2f25a` (upstream), plus `patches/zluda/0002`, `0003`, `0004`, `0005` in that order |
| vkd3d-proton | `3dfc6f07` (the base GE-Proton11-3 ships), plus `patches/vkd3d-proton/0001` |
| ROCm | 7.2 (HIP runtime, clang, device libraries) |
| Proton | GE-Proton11-3 (with its OptiScaler integration) |
@@ -17,7 +17,7 @@ git clone https://github.com/vosen/ZLUDA zluda && cd zluda
git checkout ee2f25a
git submodule update --init --recursive
git lfs pull
for p in 0002 0003 0004; do git apply /path/to/d4r/patches/zluda/$p-*.patch; done
for p in 0002 0003 0004 0005; do git apply /path/to/d4r/patches/zluda/$p-*.patch; done
# rebuild the device helpers the patches changed (ptx/lib/zluda_ptx_impl*.bc)
ZLUDA_SOURCE_ROOT=$PWD ROCM_ROOT=/opt/rocm /path/to/d4r/scripts/build_zluda_ptx_helpers.sh
LIBRARY_PATH=/opt/rocm/lib cargo build --release -p zluda
@@ -33,6 +33,7 @@ What the patches add:
- **0002**: the CUDA driver API surface NGX and DLSS use (arrays, textures, surfaces, 1010102 formats, launch parameter buffers), the PTX features DLSS kernels need, and module dumps for debugging (`D4R_ZLUDA_DUMP_DIR`).
- **0003**: an implicit 256-thread launch bound for kernels without PTX bounds (removes massive register spilling, `D4R_ZLUDA_IMPLICIT_MAX_BLOCK`) and f16 tensor-core MMA on RDNA3 WMMA (`D4R_ZLUDA_WMMA`).
- **0004**: the native kernel override hook (`D4R_ZLUDA_NATIVE_DIR`, see [native-kernels.md](native-kernels.md)), FP8 MMA on WMMA (`D4R_ZLUDA_WMMA_FP8`), optional elision of per-instruction denormal mode switches (`D4R_ZLUDA_IGNORE_DENORMAL`), inlined image helpers, and linking extra bitcode into a PTX module (`D4R_ZLUDA_EXTRA_BC`, used by the texture-kernel build).
- **0005**: a null texture object (CUDA handle 0) reads as zeros, as on NVIDIA GPUs, instead of faulting the GPU. DLSS samples absent optional inputs that way in some configurations (low-resolution motion vectors without HDR, as in Ghost of Tsushima).
## 2. vkd3d-proton