Instead of having a hardcoded table to convert between sRGB formats and
their linear-gamma equivalents (and vice-versa), generate this from the
information in the format table.
This requires adding a 'sublayout' attribute to differentiate between,
e.g. DXT1 and DXT3, which otherwise appear to be equivalent but for
their name prefix.
As an anonymous union is being used, we also need named initialisers for
the util_format_description entries.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29649>
u_format has always had its format table in CSV. This is kind of nice
for some things, but is a serious pain to extend, especially with
optional fields.
In going through our many (many, many) duplicated tables of format
mappings, it would've been nice to add some descriptions to our central
u_format table, such as mapping to DRM FourCC, to EGLImage mappings, and
to GL internalformats for EGLImage imports. Unfortunately, doing so with
more additional fields would just make the CSV totally unreadable.
Move the CSV table to a YAML-based table and adjust the Python parsers
to suit. The resulting generated files are identical before and after
the transition.
The new parser also has a significant amount of format validation to
make it easier to catch common errors.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29649>
Eric R. Smith