47158e1606
Cycles automatic denoiser picker assumed that OIDN could not be run on the GPU while the CPU was the render device. So if the user was using their CPU for rendering, the automatic denoiser picker would "fallback" to a different denoiser (OptiX or CPU OIDN). This was true in Blender 4.1, but changed in 4.2. The UI assumed that OIDN could run on the GPU if there was a compatible OIDN GPU device. This lead to a issue on systems using the CPU for rendering while having a NVIDIA GPU installed in the system. The UI suggested that OIDN would be used, and would switch between CPU and GPU depending on user preferences. But the automatic denoiser picker in Cycle's backend said OIDN could not run on the GPU in this situation and would always "fallback" to the OptiX denoiser running on the NVIDIA GPU. This created a mismatch between the UI and what Cycles was acutally doing. This issue did not effect other GPU vendors because their "fallback" was the OIDN denoiser. This commit fixes this issue by aligning the Cycles automatic denoiser picker in the backend with the UI. Using OIDN if a GPU is supported, falling back to OptiX if it's not supported, falling back to OIDN CPU if OptiX isn't supported, then falling back to no denoiser if that's not supported. Pull Request: https://projects.blender.org/blender/blender/pulls/123530
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