[Mesa-dev] [Bug 110259] radv: Sampling depth-stencil image in GENERAL layout returns nothing but zero (regression, bisected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110259

            Bug ID: 110259
           Summary: radv: Sampling depth-stencil image in GENERAL layout
                    returns nothing but zero (regression, bisected)
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: philip.rebohle at tu-dortmund.de
        QA Contact: mesa-dev at lists.freedesktop.org

Hello,

in some cases, DXVK creates depth-stencil images that are never transitioned
out of VK_IMAGE_LAYOUT_GENERAL. From a D3D11 point of view, these images are
only ever used for data transfers, and some of those transfers are implemented
via compute shaders, so the usage flags are (TRANSFER_SRC | TRANSFER_DST |
SAMPLED).

The problem is that the compute shaders in question read nothing but zeroes
when using the GENERAL layout for sampling. It does work correctly when using
SHADER_READ_ONLY_OPTIMAL, and it also works fine when setting RADV_DEBUG=nohiz.

Here's a renderdoc capture illustrating the issue:
https://mega.nz/#!5DAn3IhB!5Z7LWX0phZc3GBmYV86YpbYouueU-C342MbqYHjy_PU

The bookmarked dispatch call reads the image and packs its contents into a
buffer. All buffer values should be 0x00FFFFFF if things work correctly, but
are 0x00000000 right now.

The commit which introduced the issue is:

    commit 3a2e93147f7fa4a6fd17313353113a33291c5ce0 (refs/bisect/bad)
    Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
    Date:   Thu Mar 14 14:27:03 2019 +0100

        radv: always initialize HTILE when the src layout is UNDEFINED

This issue currently breaks the games Lords of the Fallen and The Surge.

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