Protect WriteSymbolData if the Filename is empty
#jira UE-190842
[REVIEW] [at]matt.peters
#tests cooking CitySample
[CL 26528753 by tom holmes in ue5-main branch]
Platforms can return a platform hash and a blob of text data to go with that hash
These are stored one / line in ShaderSymbols.info in lieu of full PDB info
Useful when full shader PDBs are impractically large, info-only is much smaller
#rb dan.elksnitis, john.huelin, serge.bernier
#tests test on cooking Lyra, various platforms, noddc and ddc
[CL 26496825 by tom holmes in ue5-main branch]
* Major define optimization involves converting map of defines to use FName keys and variant values rather than strings -- this eliminates most of the cost of string hashing, allocation, and conversion.
* Lower overhead FHashTable used instead of TMap.
* An initial map of defines can optionally be provided globally. Anything using an initial define can have its map index cached for optimized lookup when reading or writing.
Other micro-optimizations:
* Added Reserve calls for uniform buffer related maps, to eliminate map resizing / rehashing. Saved around 15% perf (after define optimizations).
* Added a map for UB lookup, instead of iterating through the linked list. Saved around 10% perf.
Non-optimization: Sort the order in which uniform buffer variable names are searched in BuildShaderFileToUniformBufferMap, to create determinism in ShaderDebug data for A/B testing (previously order was dependent on global constructor order for UB definitions, which could vary arbitrarily with unrelated changes).
#jira UE-187334
#rnx
#rb dan.elksnitis jason.nadro yuriy.odonnell
[CL 26142884 by jason hoerner in ue5-main branch]
- remove redundant options struct initialization in DumpDebugShaderData - this was resulting in losing some of the options set in the input parameter options struct
- add explicit "DumpExtendedDebugShaderData" which includes the additional debug output functionality only previously available if an IShaderFormat implementation inherited from FBaseShaderFormat
- add "AdditionalOutputs" functionality which can be used by backends to dump additional (text-based) files following the file naming rules as dictated by the options struct with less boilerplate code
- add a helper for constructing a debug filename from the debug output options struct (some backends require constructing such filenames for i.e. contents of batchfiles; the helper reduces boilerplate code in such cases)
- fix condition for old path of dumping OutputHash.txt to not redundantly dump if shader format supports independent preprocessing and preprocessed cache is enabled
#rb Massimo.Tristano
[CL 25892792 by dan elksnitis in ue5-main branch]
- add new fields to FShaderCompilerOutput which should be populated with the shader source and entry point name if modified by a backend compile process (in a format implementing the independent preprocessing API). this is intended to supercede "OptionalFinalShaderSource" for such shader formats, as well as being used as the source for preprocessed debug dumps when enabled.
- modify the PCD3D shader format to use these fields as intended (and so fix the debug output for pipelines which remove unused interpolators to match the final modified source).
#rb Laura.Hermanns
#preflight 64777f850848b7126dda194c
[CL 25706448 by dan elksnitis in ue5-main branch]
