Update astcenc to the upstream 5.3.0 release #104462
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This is mostly a maintenance update that brings the compressor inline with the recently published Khronos Data Format Specification 1.4 release which clarified some ambiguity in the specification. This update also gives minor codec optimizations, bug fixes, and image quality improvements. The biggest improvement for Godot is that builds using MSVC cl.exe will now correctly default to the SSE2-optimized backend rather than the reference C backend. This makes compression more than 3 times faster. Builds using other compilers (GCC, LLVM/Clang) were not impacted by the underlying issue, and see no performance uplift.
fire
approved these changes
Mar 22, 2025
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This is a maintenance update for the Arm astcenc ASTC compressor, updating to the upstream 5.3.0 release. This brings the compressor inline with the latest Khronos Data Format Specification, v1.4.0, which clarified some ambiguous compressor functionality. There are no major changes in terms of core codec functionality compared to the 4.8.0 release that Godot had been using, but many minor optimizations, bug fixes, and image quality improvements.
The biggest improvement for Godot users is that builds using the Visual Studio
cl.execompiler will now correctly default to the SSE2-optimized backend (on x86-64) and NEON-optimized backend (on Arm64) rather than the reference C backend. This makes compression more than 3 times faster. Builds using other compilers (GCC, LLVM/Clang) were not impacted by the underlying issue, and see no performance uplift.(For avoidance of doubt, I'm the upstream maintainer for astcenc at Arm).