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man: expand on gbm-format

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Since 62a9436417 the gbm-format option has
recognized all pixel formats listed in libweston/pixel-formats.c.

Clarify what pixel formats can be used.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2022-03-11 11:40:44 +02:00 committed by Marius Vlad
parent 1f5e19fab3
commit ce059cffdb
1 changed files with 14 additions and 5 deletions
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19
man/weston-drm.man
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@ -46,11 +46,20 @@ The DRM backend uses the following entries from
.SS Section core .SS Section core
.TP .TP
\fBgbm-format\fR=\fIformat\fR \fBgbm-format\fR=\fIformat\fR
sets the GBM format used for the framebuffer for the GBM backend. Can be Sets the default pixel format for DRM KMS framebuffers.
.B xrgb8888, .IR Format " can be"
.B xrgb2101010, .BR xrgb8888 ", " xrgb2101010 ", " rgb565
.B rgb565. or others. Weston recognizes the names of most pixel formats defined by
By default, xrgb8888 is used. the kernel DRM subsystem in
.B drm_fourcc.h
header without the DRM_FORMAT_ prefix.
The actually supported pixel formats depend on the DRM driver and hardware,
and the renderer used. Using Pixman-renderer, DRM-backend supports only
.BR xrgb8888 " and " rgb565 .
The formats supported with GL-renderer depend on the EGL and OpenGL ES 2 or 3
implementations. The names are case-insensitive.
.RB "If not specified, " xrgb8888 " is used."
.TP .TP
\fBpageflip-timeout\fR=\fImilliseconds\fR \fBpageflip-timeout\fR=\fImilliseconds\fR
sets Weston's pageflip timeout in milliseconds. This sets a timer to exit sets Weston's pageflip timeout in milliseconds. This sets a timer to exit