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egl/wayland: Support RGB[A]16_UNORM formats for display.

Browse source 
This allows clients to send high color precision wl_buffers
to servers which support the format.

Use the EGL_EXT_config_select_group extension to put these 16 bpc
unorm formats into a lower priority config select group 1, so they
don't get preferably chosen by default by eglChooseConfig(), but must
be explicitely requested by client applications which really need the
high color precision of these 64 bpp formats and are happy to pay the
potential performance impact.

Successfully tested with KDE Kwin 6.4, and the GNOME Mutter 50
development branch, which has been enhanced to support these
formats, also for direct scanout, and with Weston 13, which is
also able to directly scan out to a 16 bpc framebuffer on suitable
AMD gpu's.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38588>
This commit is contained in:
Mario Kleiner 2025-11-06 07:30:30 +00:00 • committed by Marge Bot
parent f2aaa9ce00
commit cf9ab823eb
1 changed files with 24 additions and 0 deletions
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24
src/egl/drivers/dri2/platform_wayland.c
View file

@ -93,6 +93,18 @@ static const struct dri2_wl_visual {
PIPE_FORMAT_NONE,
DRM_FORMAT_XBGR16161616F,
},
{
DRM_FORMAT_ABGR16161616,
PIPE_FORMAT_R16G16B16A16_UNORM,
PIPE_FORMAT_NONE,
DRM_FORMAT_XBGR16161616,
},
{
DRM_FORMAT_XBGR16161616,
PIPE_FORMAT_R16G16B16X16_UNORM,
PIPE_FORMAT_NONE,
DRM_FORMAT_XBGR16161616,
},
{
DRM_FORMAT_XRGB2101010,
PIPE_FORMAT_B10G10R10X2_UNORM,
@ -2529,6 +2541,8 @@ dri2_wl_add_configs_for_visuals(_EGLDisplay *disp)
/* Try to create an EGLConfig for every config the driver declares */
for (unsigned i = 0; dri2_dpy->driver_configs[i]; i++) {
struct dri2_egl_config *dri2_conf;
enum pipe_format format = PIPE_FORMAT_NONE;
EGLint config_group = 0;
bool conversion = false;
bool server_supported = true;
int idx = dri2_wl_visual_idx_from_config(dri2_dpy->driver_configs[i]);
@ -2548,14 +2562,24 @@ dri2_wl_add_configs_for_visuals(_EGLDisplay *disp)
/* The alternate format is supported by the server, so we can
* convert whilst we do a blit. */
conversion = true;
format = dri2_wl_visuals[idx].alt_pipe_format;
} else {
/* Not supported at all by the server. */
server_supported = false;
}
} else {
format = dri2_wl_visuals[idx].pipe_format;
}
/* Put the 16 bpc rgb[a] unorm formats into a lower priority EGL config
* group 1, so they don't get preferably chosen by eglChooseConfig().
*/
if (server_supported && util_format_is_unorm16(util_format_description(format)))
config_group = 1;
EGLint attr_list[] = {
EGL_NATIVE_VISUAL_ID, dri2_wl_visuals[idx].wl_drm_format,
EGL_CONFIG_SELECT_GROUP_EXT, config_group,
EGL_NONE,
};