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Hash : 9b5fff82
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Date : 2022-10-05T21:56:00

Vulkan: Emulate shader stencil export for MSRTT

The MSRTT emulation code had one corner case issue that could lead to
performance and memory inefficiencies.  That is when stencil needs to be
unresolved and VK_EXT_shader_stencil_export is not supported.

This change adds a path to emulate VK_EXT_shader_stencil_export and
removes this inefficiency.

This should help Chromium on older Android devices that lack both this
and the recent VK_EXT_multisampled_render_to_single_sampled extensions.
Chromium frequently breaks the render pass (crbug.com/1336981), which
easily leads to this situation.

Bug: angleproject:4836
Change-Id: Ifceec43f7f3807b7e32f4b379edcd4351ae76414
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3935892
Reviewed-by: Yuxin Hu <yuxinhu@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>

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