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Ashton @misyltoad","VK_VALVE_video_encode_rgb_conversion","2025-09-19",{"title":2199,"description":2200,"body":2201,"_type":3597,"_id":2199},"VK_EXT_pipeline_library_group_handles.proposal","This extension adds support for querying ray tracing group handles on library creation time rather than waiting for pipeline linking.\nThis improves composability for applications that mix and match libraries or incrementally create shader groups.",{"type":2202,"children":2203,"toc":3587},"root",[2204,2211,2216,2223,2228,2233,2239,2244,2249,2254,2259,2265,2271,2276,2347,2368,2373,2386,2392,2398,2403,3252,3257,3581],{"type":2205,"tag":2206,"props":2207,"children":2208},"element","p",{},[2209],{"type":2210,"value":2200},"text",{"type":2205,"tag":2206,"props":2212,"children":2213},{},[2214],{"type":2210,"value":2215},"Compatibility with DXR 1.1 is also improved. In that API, it is possible to query handles on COLLECTION creation time,\nand handles are guaranteed to remain bitwise identical when linked into other pipelines.\nAddToStateObject() is another API which incrementally adds shader groups to a ray tracing pipeline and group handles are required to remain bitwise identical in that scenario as well.",{"type":2205,"tag":2217,"props":2218,"children":2220},"h2",{"id":2219},"_problem_statement",[2221],{"type":2210,"value":2222},"Problem Statement",{"type":2205,"tag":2206,"props":2224,"children":2225},{},[2226],{"type":2210,"value":2227},"When using pipeline libraries with ray tracing,\nthe intent is that pipeline libraries allow for a flexible model where pipeline libraries are compiled in isolation, and later, pipelines can be linked rapidly on-demand.\nBased on the relevant materials that are active in a scene, a ray tracing pipeline can be linked that suits that scene.",{"type":2205,"tag":2206,"props":2229,"children":2230},{},[2231],{"type":2210,"value":2232},"However, relinking a pipeline in the current API means that all group handles are invalidated,\nand group handles must be required and uploaded to the device for every pipeline. This is not desirable.",{"type":2205,"tag":2217,"props":2234,"children":2236},{"id":2235},"_solution_space",[2237],{"type":2210,"value":2238},"Solution Space",{"type":2205,"tag":2206,"props":2240,"children":2241},{},[2242],{"type":2210,"value":2243},"There are not many options for how to implement this feature.\nThe only way to expose this feature is to allow group handles to be queried on the pipeline library itself.\nThe second part is to add a guarantee about invariance.\nFor every library that includes a pipeline library,\nthe group handles remain bitwise identical.\nThis means that applications do not have to query the group handle after linking, it can keep using the same record buffers in ray tracing dispatches.",{"type":2205,"tag":2206,"props":2245,"children":2246},{},[2247],{"type":2210,"value":2248},"For capture replay, we also allow capture replay handles to be extracted from pipeline libraries. When creating a pipeline library,\nthose capture replay handles can be used, which also ensures invariance for any pipeline that includes the library.",{"type":2205,"tag":2206,"props":2250,"children":2251},{},[2252],{"type":2210,"value":2253},"Rather than allowing group handles directly from libraries,\nit would be possible to require applications to link a pipeline library trivially by creating a complete pipeline with no extra shader groups and one pipeline library.\nFrom there, group handles can be queried.\nThis is problematic since fully linked pipelines must include a ray generation shader stage. Forcing applications to include one just for the sake of querying handles is awkward.",{"type":2205,"tag":2206,"props":2255,"children":2256},{},[2257],{"type":2210,"value":2258},"Another consideration is if we need a new pipeline creation flag to state that group handles can be queried from a library.\nThe assumption and premise of this extension is that drivers already compile pipelines into binary form on library creation time,\nso adding a pipeline creation flag just clutters the API.",{"type":2205,"tag":2217,"props":2260,"children":2262},{"id":2261},"_proposal",[2263],{"type":2210,"value":2264},"Proposal",{"type":2205,"tag":2266,"props":2267,"children":2269},"h3",{"id":2268},"_features",[2270],{"type":2210,"value":223},{"type":2205,"tag":2206,"props":2272,"children":2273},{},[2274],{"type":2210,"value":2275},"The entire extension is covered by a feature 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pipelineLibraryGroupHandles;\n",{"type":2205,"tag":2289,"props":2340,"children":2341},{"class":2291,"line":26},[2342],{"type":2205,"tag":2289,"props":2343,"children":2344},{"style":2306},[2345],{"type":2210,"value":2346},"} VkPhysicalDevicePipelineLibraryGroupHandlesFeaturesEXT;\n",{"type":2205,"tag":2206,"props":2348,"children":2349},{},[2350,2352,2358,2360,2366],{"type":2210,"value":2351},"When this feature is enabled, restrictions are lifted on ",{"type":2205,"tag":2285,"props":2353,"children":2355},{"className":2354},[],[2356],{"type":2210,"value":2357},"vkGetRayTracingShaderGroupHandlesKHR",{"type":2210,"value":2359}," and ",{"type":2205,"tag":2285,"props":2361,"children":2363},{"className":2362},[],[2364],{"type":2210,"value":2365},"vkGetRayTracingCaptureReplayShaderGroupHandlesKHR",{"type":2210,"value":2367},",\nand it is valid to use it on pipeline libraries as well.\nThe expectation is that implementations create binaries at library creation time and there are no differences in querying group handles from a library or a linked pipeline.\nInvariance is also guaranteed, so that the group handle can be queried just once by application and reused for every pipeline that links against the library.",{"type":2205,"tag":2206,"props":2369,"children":2370},{},[2371],{"type":2210,"value":2372},"Group indices work as-if the pipeline was already fully linked.",{"type":2205,"tag":2206,"props":2374,"children":2375},{},[2376,2378,2384],{"type":2210,"value":2377},"Note that invariance is not relevant for linked pipelines that are created without ",{"type":2205,"tag":2285,"props":2379,"children":2381},{"className":2380},[],[2382],{"type":2210,"value":2383},"VK_PIPELINE_CREATE_LIBRARY_BIT_KHR",{"type":2210,"value":2385},".\nThese pipelines cannot be linked into any other pipelines, so the question of invariance does not exist.\nCreating an equivalent pipeline without going through the library mechanism does not guarantee invariance of group handles.",{"type":2205,"tag":2217,"props":2387,"children":2389},{"id":2388},"_example",[2390],{"type":2210,"value":2391},"Example",{"type":2205,"tag":2266,"props":2393,"children":2395},{"id":2394},"_incrementally_linking",[2396],{"type":2210,"value":2397},"Incrementally linking",{"type":2205,"tag":2206,"props":2399,"children":2400},{},[2401],{"type":2210,"value":2402},"This style of implementation matches DXR 1.1 AddToStateObject().",{"type":2205,"tag":2277,"props":2404,"children":2406},{"className":2279,"code":2405,"language":2281,"meta":2282,"style":2282},"\u002F\u002F Pseudo-code. 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