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* 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]