Use Accelerate framework for texture image processing on iOS and fix premultiplication issues#6470
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Nice one finding this. Let's get it in and see how it goes. As touched on in discord, premult should still be our end-goal, but it can be put on the backburner as it's more of an optimisation than a must-have. |
peppy
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Dec 23, 2024
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Apple offers high-performance / SIMD-based image processing API under its Accelerate framework called
vImage, suiting our needs perfectly as well as providing support for non-premultiplied image loading (I've only been aware of this as I was working towards changing the entire game to use premultiplied colours).The benchmark methodology may be basic, but I've benchmarked this by measuring time spent on loading each texture while randomly browsing through osu!. Results show roughly close match between master and this PR.
To ensure the premultiplication issues are appropriately fixed, I've added a test scene for it.
The intro artifacts in ppy/osu#9922 will not be fixed by this PR. A separate PR will handle this (ppy/osu-resources#351).