Robert Mader
4051d4ef59
Right now llvmpipe only successfully supports single-plane formats,
limiting the number of supported YCbCr formats to a relatively small
number.
The implicit support for R8G8_R8B8 style subsampled RGB formats
causes the most common ones, YUYV and its variants, to chain up
to to lp_build_fetch_subsampled_rgba_aos() when importing (u)dmabufs
with EXT_image_dma_buf_import.
This code path currently has at least the following issues:
1. It doesn't support the YVYU/PIPE_FORMAT_R8B8_R8G8_UNORM and
VYUY/PIPE_FORMAT_B8R8_G8R8_UNORM, resulting in asserts/crashes.
2. The supported cases, YUYV and UYVY, end up with sub-optimal results
as they always return BT.601/narrow results, ignoring
EGL_YUV_COLOR_SPACE_HINT_EXT and EGL_SAMPLE_RANGE_HINT_EXT.
Stopping advertising support for those formats, as well as native support
for PIPE_FORMAT_YUYV and PIPE_FORMAT_UYVY, results in all four variants
taking fallback paths which happen to be much better supported.
An additional effect is that YUYV and UYVY are correctly advertised as
external only.
Cc: mesa-stable
Signed-off-by: Robert Mader <robert.mader@collabora.com>
Acked-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34775>
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