backport and standarize options#46
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tilerMode is only partially active. preferCachedMemory biases host-visible allocations toward cached memory on tilers and works. preferRenderPassOps is detected and set but not yet consumed by Sarek render-pass code, which diverges significantly from upstream; wiring it requires changes to the context/render-pass layer and on-device testing, left as a future todo.
pythonlover02
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Zero initializes host-visible mapped memory to work around games that assume freshly mapped buffers are clean and break on stale data. Sarek static budget allocator has no per allocation flags or clear on free hook like upstream, so this clears on handout instead of on free. Memory is zeroed at every site that returns a mapped pointer: sub-allocated slices in DxvkMemoryChunk::alloc (covering reused slices from recycled chunks) and direct large/dedicated allocations in tryAllocFromType. Nonmapped memory is skipped via a null map-pointer guard. App visible guarantee matches upstream (no resource ever receives stale mapped data), but the mechanism differs. Off by default; adds one memset per host visible allocation when enabled.
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