Adding upstream version 2.4.114.upstream/2.4.114upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 51 insertions, 0 deletions

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+libdrm - userspace library for drm
+----------------------------------
+
+This is libdrm, a userspace library for accessing the DRM, direct rendering
+manager, on Linux, BSD and other operating systems that support the ioctl
+interface.
+The library provides wrapper functions for the ioctls to avoid exposing the
+kernel interface directly, and for chipsets with drm memory manager, support
+for tracking relocations and buffers.
+New functionality in the kernel DRM drivers typically requires a new libdrm,
+but a new libdrm will always work with an older kernel.
+
+libdrm is a low-level library, typically used by graphics drivers such as
+the Mesa drivers, the X drivers, libva and similar projects.
+
+Syncing with the Linux kernel headers
+-------------------------------------
+
+The library should be regularly updated to match the recent changes in the
+`include/uapi/drm/`.
+
+libdrm maintains a human-readable version for the token format modifier, with
+the simpler ones being extracted automatically from `drm_fourcc.h` header file
+with the help of a python script.  This might not always possible, as some of
+the vendors require decoding/extracting them programmatically.  For that
+reason one can enhance the current vendor functions to include/provide the
+newly added token formats, or, in case there's no such decoding
+function, to add one that performs the tasks of extracting them.
+
+For simpler format modifier tokens there's a script (gen_table_fourcc.py) that
+creates a static table, by going over `drm_fourcc.h` header file. The script
+could be further modified if it can't handle new (simpler) token format
+modifiers instead of the generated static table.
+
+Compiling
+---------
+
+To set up meson:
+
+    meson builddir/
+
+By default this will install into /usr/local, you can change your prefix
+with --prefix=/usr (or `meson configure builddir/ -Dprefix=/usr` after 
+the initial meson setup).
+
+Then use ninja to build and install:
+
+    ninja -C builddir/ install
+
+If you are installing into a system location you will need to run install
+separately, and as root.