-
Show log
Commit
-
Hash : cd10ad46
Author :
Date : 2024-09-30T00:00:00
Metal: Rework allowSamplerCompareGradient feature * AMD drivers may fail when a sample_compare function is used with explicit derivatives. To avoid such failures, the effective level is computed from the texture size, passed derivatives, and texture coordinates, if needed. The level value is then used for sample_compare instead of the explicit derivatives. * Apple2 GPUs do not support setting texture sampler compare state via Metal API. As a result, all sample_compare functions including those without LOD options do not work on Apple2 GPUs. This feature was attempting to incorrectly emulate a subset of sample_compare functions with a hard-coded compare state. There are no plans to support shadow samplers on Apple2 GPUs, as it would require non-trivial emulation, so this feature is no longer relevant for that platform. * Metal on macOS 10.15 only supports constant zero as the level parameter for sample_compare functions. Ignoring the passed derivatives and using zero LOD on old OS versions is a better fallback than dropping the derivatives altogether because many applications use the derivatives to set the level to zero anyway. Bug: angleproject:365066518 Bug: angleproject:368059227 Change-Id: I4028421b785ae49328b72658e0a9783275461779 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5903970 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>
