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zink: allow software rendering only if selected

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In environments where 3D acceleration is not available, like in a VM,
the behavior before commit 8cd44b8843 ("egl: add automatic zink
fallback loading between hw and sw drivers") was to fallback to swrast.

This was the output of `eglinfo` in that situation:

    $ eglinfo
    [...]
    Wayland platform:
    EGL driver name: swrast
    OpenGL core profile renderer: llvmpipe (LLVM 17.0.4, 256 bits)

However, after commit 8cd44b8843 ("egl: add automatic zink fallback
loading between hw and sw drivers") Zink support is tested before
falling back to swrast.
Since the system doesn't support 3D acceleration, Zink + software
rendering is used instead of swrast causing issues like the ones
described in #10146.

In this case, `eglinfo` prints:

    $ eglinfo
    [...]
    Wayland platform:
    EGL driver name: zink
    OpenGL core profile renderer: zink Vulkan 1.3(llvmpipe (LLVM 17.0.4,
    256 bits) (MESA_LLVMPIPE))

This patch ensures that Zink + software rendering is used only when the
user opts-in by setting `LIBGL_ALWAYS_SOFTWARE` or `D3D_ALWAYS_SOFTWARE`
and swrast is used otherwise.

After the patch, the output of `eglinfo` is identical to the one before
the regression:

    $ eglinfo
    [...]
    Wayland platform:
    EGL driver name: swrast
    OpenGL core profile renderer: llvmpipe (LLVM 17.0.4, 256 bits)

Resolves: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10146
Fixes: 8cd44b8843 ("egl: add automatic zink fallback loading between
hw and sw drivers")

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: José Expósito <jexposit@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26220>
This commit is contained in:
José Expósito
2023-11-16 12:18:29 +01:00
committed by Marge Bot
parent 99fed1f9b3
commit 2a71f06f29
1 changed files with 6 additions and 0 deletions
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6
src/gallium/drivers/zink/zink_screen.c
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@@ -1632,6 +1632,12 @@ choose_pdev(struct zink_screen *screen, int64_t dev_major, int64_t dev_minor)
}
VKSCR(GetPhysicalDeviceProperties)(screen->pdev, &screen->info.props);
/* allow software rendering only if forced by the user */
if (!cpu && screen->info.props.deviceType == VK_PHYSICAL_DEVICE_TYPE_CPU) {
screen->pdev = VK_NULL_HANDLE;
return;
}
screen->info.device_version = screen->info.props.apiVersion;
/* runtime version is the lesser of the instance version and device version */