diff options
| author | James Calligeros <jcalligeros99@gmail.com> | 2026-10-07 19:33:19 +1000 |
|---|---|---|
| committer | Lyude Paul <lyude@redhat.com> | 2026-10-13 15:12:44 -0400 |
| commit | a77fa227bb0c681eaa0a20476a388c176af4789e (patch) | |
| tree | 8fa4f9ffb9f854afdba71ae9417aedcb8ef45023 /include/uapi | |
| parent | 1c50c57717c013ca63363eecb4154049cc727767 (diff) | |
drm/fourcc: Add Apple Interchange layout format modifier
Apple Interchange is a tiled and compressed image layout used
for buffer exchange between Apple hardware blocks. It is
similar to the already-supported GPU_TILED_COMPRESSED layout.
Add a format modifier for Apple Interchange so that it can be
used for buffer exchange.
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenz.ca>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patch.msgid.link/20261007-apple-interchange-modifier-v3-1-721fc44abf6b@gmail.com
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/drm/drm_fourcc.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index a103fdc0b3a3..0bb049f91524 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -1627,6 +1627,30 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier) #define DRM_FORMAT_MOD_APPLE_GPU_TILED_COMPRESSED fourcc_mod_code(APPLE, 2) /* + * Apple Interchange layout + * + * Apple Interchange is a compressed framebuffer format used exclusively for + * sharing buffers between hardware blocks (GPU, display controller, video + * codecs) on Apple platforms. It is similar to and uses the same compression + * scheme as GPU_TILED_COMPRESSED. There is no known uncompressed variant + * of Apple Interchange. + * + * Unlike the GPU layouts, tile size is not dependent on bit depth. RGB + * images and the chroma components of YUV images use 16x16 tiles. The + * luma component of YUV images uses 32x32 tiles. Compression tiles + * are once again 16x16 with 8 bytes of metadata per compression subtile. + * + * Following the example set by GPU_TILED_{,COMPRESSED}, Interchange images + * are treated as a single plane by software and do not have a meaningful + * stride. + * + * AGX has limited support for Apple Interchange. It cannot be used for Z/S + * buffers or array images, for example. It is intended for scanout buffer + * sharing only. + */ +#define DRM_FORMAT_MOD_APPLE_INTERCHANGE fourcc_mod_code(APPLE, 3) + +/* * AMD modifiers * * Memory layout: |