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android / platform / external / libkmsxx / c49c3e1965395f2d4ddef99ddb1e7a5f3062bc76
commitc49c3e1965395f2d4ddef99ddb1e7a5f3062bc76[log] [tgz]
authorXin Li <delphij@google.com>Sat Feb 20 00:24:12 2021 -0800
committerXin Li <delphij@google.com>Sat Feb 20 00:24:12 2021 -0800
tree8ac1a7266fc264022adc90f0839f652add01ecbc
parent25415a1eeb0a7815b0cf5417641834f5fb21724f [diff]
parent1967f06dd7aed7c6e87ba9dd0076e4ad5661d173 [diff]
Mark ab/7061308 as merged in stage.

Bug: 180401296
Merged-In: Ie0f77abf4416296aef54b2519f5ec1db072b4fe9
Change-Id: I1142f68e04f3581b3fe39e9f83018ef5f10ff689
tree: 8ac1a7266fc264022adc90f0839f652add01ecbc
  1. kms++/
  2. kms++util/
  3. kmscube/
  4. py/
  5. scripts/
  6. subprojects/
  7. utils/
  8. .clang-format
  9. .clang-tidy
  10. .gitignore
  11. .gitmodules
  12. .travis.yml
  13. Android.bp
  14. LICENSE
  15. meson.build
  16. meson_options.txt
  17. METADATA
  18. MODULE_LICENSE_MPL2
  19. OWNERS
  20. README.md
  21. TODO
README.md

Build Status

kms++ - C++ library for kernel mode setting

kms++ is a C++17 library for kernel mode setting.

Also included are some simple utilities for KMS and python bindings for kms++.

Utilities

  • kmstest - set modes and planes and show test pattern on crtcs/planes, and test page flips
  • kmsprint - print information about DRM objects
  • kmsview - view raw images
  • kmscube - rotating 3D cube on crtcs/planes
  • kmscapture - show captured frames from a camera on screen

Dependencies:

  • libdrm
  • Python 3.x (for python bindings)

Build instructions:

To build the Python bindings you need to set up the git-submodule for pybind11:

git submodule update --init

And to compile:

meson build
ninja -C build

Cross compiling instructions:

meson build --cross-file=<path-to-meson-cross-file>
ninja -C build

Here is my cross file for arm32 (where ${BROOT} is path to my buildroot output dir):

[binaries]
c = ['ccache', '${BROOT}/host/bin/arm-buildroot-linux-gnueabihf-gcc']
cpp = ['ccache', '${BROOT}/host/bin/arm-buildroot-linux-gnueabihf-g++']
ar = '${BROOT}/host/bin/arm-buildroot-linux-gnueabihf-ar'
strip = '${BROOT}/host/bin/arm-buildroot-linux-gnueabihf-strip'
pkgconfig = '${BROOT}/host/bin/pkg-config'

[host_machine]
system = 'linux'
cpu_family = 'arm'
cpu = 'arm'
endian = 'little'

Build options

You can use meson options to configure the build. E.g.

meson build -Dbuildtype=debug -Dkmscube=true

Use meson configure build to see all the configuration options and their current values.

kms++ specific build options are:

Option nameValuesDefaultNotes
pykmstrue, falsetruePython bindings
kmscubetrue, falsefalseGLES kmscube
omapenabled, disabled, autoautolibdrm-omap support

Env variables

You can use the following runtime environmental variables to control the behavior of kms++.

VariableDescription
KMSXX_DISABLE_UNIVERSAL_PLANESSet to disable the use of universal planes
KMSXX_DISABLE_ATOMICSet to disable the use of atomic modesetting
KMSXX_DEVICEPath to the card device node to use
KMSXX_DRIVERName of the driver to use. The format is either “drvname” or “drvname:idx”

Python notes

You can run the python code directly from the build dir by defining PYTHONPATH env variable. For example:

PYTHONPATH=build/py py/tests/hpd.py