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Release 1.21.4

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# Cemu detailed changelog for 1.21.4
# Patreon release date: 2020-10-16
# Public release date:  2020-10-23

general: Updated the memory searcher tool
         Fixed a recent regression that made the tool crash (#411)
         All memory areas are now scanned (previously only the main app heap area, MEM2, was scanned)
         Scans are now multi-threaded (one thread per region)

general: The UI option for verifying online accounts now provides more detailed error messages (specifically for problems with account.dat)

GX2: Tiling aperature now correctly handles linear texture formats
     Fixes garbled textures in multiple games developed by Wayforward (e.g. DuckTales (#198) and Adventure Time: Explore the Dungeon)

Vulkan: Fixed a bug in the texture memory manager where large alignment requirements could lead to integer underflow
        This fixes random texture corruptions that would predominantely occur on older Nvidia GPUs (Maxwell and before) (#421) (#285)

OpenGL/Vulkan: Correctly truncate the lower 8 bits of colorbuffer addresses
               Fixes broken graphics in How To Survive

AX: Correctly handle looping for ADPCM voices when the end offset is not a valid ADPCM address
    Fixes background music and a related crash in How To Survive

AX: Small tweaks to audio timing which should hopefully improve overall audio stability

(#xx) refers to resolved bug tracker issues. See

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