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zink: fix format conversion logic for the alpha emulation case

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cc: mesa-stable

Signed-off-by: Luigi Santivetti <luigi.santivetti@imgtec.com>
Fixes: 252bff0f ("zink: use real A8_UNORM when possible")
Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
(cherry picked from commit 640bc3bc53)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40359>
This commit is contained in:
Luigi Santivetti 2026-02-26 12:27:32 +00:00 • committed by Eric Engestrom
parent 6c7f739b9d
commit ec658ea317
2 changed files with 2 additions and 2 deletions
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2
.pick_status.json
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@ -5524,7 +5524,7 @@
"description": "zink: fix format conversion logic for the alpha emulation case",
"nominated": true,
"nomination_type": 2,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": "252bff0f487763d11f0e4a995be0c42070751d87",
"notes": null

2
src/gallium/drivers/zink/zink_screen.c
View file

@ -1299,7 +1299,7 @@ zink_is_format_supported(struct pipe_screen *pscreen,
}
/* always use superset to determine feature support */
VkFormat vkformat = zink_get_format(screen, PIPE_FORMAT_A8_UNORM ? zink_format_get_emulated_alpha(format) : format);
VkFormat vkformat = zink_get_format(screen, format == PIPE_FORMAT_A8_UNORM ? zink_format_get_emulated_alpha(format) : format);
if (vkformat == VK_FORMAT_UNDEFINED)
return false;