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Jason Fielder fb63e484b9 Fix #103398: Fix Icon sampler initialization in Metal backend. ...

Resolves issue with nearest filtering on UI Icons. Note that as
Metal does not support LOD bias as a parameter on a sampler
object, the original code has been modified to perform LOD
biasing at the shader level.

As GPU_SAMPLER_ICON is not  widely used, it is more
efficient to apply directly to the  affected shaders, rather
than workaround passing in the sampler LOD bias as a
separate value e.g. uniform or push constant.

Original PR feedback addressed to also refactor ICON
shaders to use consistent style for single and multi
Icon rendering.

Authored by Apple: Michael Parkin-White

Ref #96261
Pull Request #105145

2023-02-26 13:23:40 +01:00

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