Bug 102024

Summary:	FORMAT_FEATURE_SAMPLED_IMAGE_BIT not supported for D16_UNORM and D32_SFLOAT
Product:	Mesa	Reporter:	pierre.krieger1708
Component:	Drivers/Vulkan/intel	Assignee:	Intel 3D Bugs Mailing List <intel-3d-bugs>
Status:	RESOLVED FIXED	QA Contact:	Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity:	normal
Priority:	medium	CC:	jason
Version:	git
Hardware:	Other
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description pierre.krieger1708 2017-08-03 08:42:40 UTC

According to section `32.3.3. Required Format Support` of the Vulkan specs, the `VK_FORMAT_D32_SFLOAT` and `VK_FORMAT_D16_UNORM` formats must support the `VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT` usage.

However the driver doesn't report this usage on my Ivy Bridge (Intel Core i5-3210M).

More generally the driver doesn't report any depth/stencil format that supports `SAMPLED_IMAGE_BIT`, which makes it a bit limiting for shadowmaps for example.

Comment 1 Jason Ekstrand 2017-08-04 03:06:14 UTC

Patch on the list:

https://patchwork.freedesktop.org/patch/170291/

Comment 2 Jason Ekstrand 2017-08-07 16:01:09 UTC

Fixed by the following commit in master:

commit 06d3115bb97740a4c8f36c645944a8bd0bde3f68
Author: Jason Ekstrand <jason.ekstrand@intel.com>
Date:   Thu Aug 3 19:58:24 2017 -0700

    anv/formats: Allow sampling on depth-only formats on gen7
    
    We can't sample from depth-stencil formats but on gen7 but we can sample
    from depth-only formats.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102024
    Reviewed-by: Juan A. Suarez Romero <jasuarez@igalia.com>
    Cc: mesa-stable@lists.freedesktop.org

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