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Description of Changes
Adds shader based anisotropic filtering to the DX renderers.
Rationale behind Changes
DX lacks support for anisotropic filtering with point filtering, currently we switch to linear filtering
That, however, causes can cause issues when alpha test is used, as colours not intended to be visible get blended in due to linear filtering, see #14077.
Additionally, AMD doesn't perform AF on textures that lack mipmaps in DX12, despite the same working in VK.
This brings parity to how the VK render behaves on NV and AMD with AF.
Suggested Testing Steps
Enable anisotropic filtering along with the new shader anisotropic filtering option under Graphics->Rendering
Notably, the shader based approach is more aggressive then Nvidia's HW AF. which is noticeable at native res.
Did you use AI to help find, test, or implement this issue or feature?
No