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Permit KHR_DF_SAMPLE_DATATYPE_LINEAR to vary from format definition. #232

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MarkCallow merged 2 commits into from
Apr 3, 2026
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Permit KHR_DF_SAMPLE_DATATYPE_LINEAR to vary from format definition. #232

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Permit KHR_DF_SAMPLE_DATATYPE_LINEAR to vary from format definition.
MarkCallow Apr 1, 2026
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MarkCallow Apr 3, 2026
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22 changes: 15 additions & 7 deletions ktxspec.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -964,13 +964,15 @@ _dfDescriptorBlock_.

* If <<_vkformat,`vkFormat`>> is not `VK_FORMAT_UNDEFINED`, the
DFD's `texelBlockDimension*`, `bytesPlane*` and sample information
fields must match the format's definition. The `colorModel` must
be `KHR_DF_MODEL_RGBSDA`, `KHR_DF_MODEL_YUVSDA` or the matching
block compressed color model listed in <<KDF14>>
{url-df-spec}#CompressedFormatModels[Section 5.6] or its successors,
currently `KHR_DF_MODEL_BC1A` to `KHR_DF_MODEL_UASTC`.
`KHR_DF_MODEL_YUVSDA` should be used for all non-prohibited
`+*_422_*+` formats.
fields must match the format's definition except that the
`KHR_DF_SAMPLE_DATATYPE_LINEAR` bit of a sample's `qualifiers`
field may differ, if required by the following bullets.
* The `colorModel` must be `KHR_DF_MODEL_RGBSDA`,
`KHR_DF_MODEL_YUVSDA` or the matching block compressed color model
listed in <<KDF14>> {url-df-spec}#CompressedFormatModels[Section
5.6] or its successors, currently `KHR_DF_MODEL_BC1A` to
`KHR_DF_MODEL_UASTC`. `KHR_DF_MODEL_YUVSDA` should be used for
all non-prohibited `+*_422_*+` formats.
* If <<_vkformat,`vkFormat`>> is one of the `+*_SRGB{,_*}+` formats,
`transferFunction` must be `KHR_DF_TRANSFER_SRGB`.
* If <<_vkformat,`vkFormat`>> is not one of the `+*_SRGB{,_*}+` formats
Expand All @@ -985,6 +987,10 @@ _dfDescriptorBlock_.
- If <<_vkformat,`vkFormat`>> is not one of the `+*_HLG{,_*}+`
formats and an HLG variant of that format exists,
`transferFunction` should not be `KHR_DF_TRANSFER_HLG`.
* If `transferFunction` is not `KHR_DF_TRANSFER_LINEAR` or `
`KHR_DF_TRANSFER_UNSPECIFIED` and an alpha channel exists,
`KHR_DF_SAMPLE_DATATYPE_LINEAR` must be set in the `qualifiers`
field of the alpha sample.
* If <<_vkformat,`vkFormat`>> is one of the `+*_[SU]INT{,_*}+` formats
or one of the depth, stencil, or combined depth/stencil formats
`colorPrimaries` must be `KHR_DF_PRIMARIES_UNSPECIFIED` and `transferFunction`
Expand Down Expand Up @@ -2542,6 +2548,8 @@ include::appendices/vendor-metadata.adoc[]
functions.
- Update KDFS references to 1.4 and
make the links active.
- Clarify that KHR_DF_SAMPLE_DATATYPE_LINEAR
can vary from format definition.
|===

[discrete]
Expand Down
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