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

kms++ is a C++11 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:

$ mkdir build
$ cd build
$ cmake ..
$ make -j4

Cross compiling instructions:

Directions for cross compiling depend on your environment.

These are for mine with buildroot:

$ mkdir build
$ cd build
$ cmake -DCMAKE_TOOLCHAIN_FILE=<buildrootpath>/output/host/usr/share/buildroot/toolchainfile.cmake ..
$ make -j4

Your environment may provide similar toolchainfile. If not, you can create a toolchainfile of your own, something along these lines:

SET(CMAKE_SYSTEM_NAME Linux)

SET(BROOT "<buildroot>/output/")

# specify the cross compiler
SET(CMAKE_C_COMPILER   ${BROOT}/host/usr/bin/arm-buildroot-linux-gnueabihf-gcc)
SET(CMAKE_CXX_COMPILER ${BROOT}/host/usr/bin/arm-buildroot-linux-gnueabihf-g++)

# where is the target environment
SET(CMAKE_FIND_ROOT_PATH ${BROOT}/target ${BROOT}/host)

SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

Build options

You can use the following cmake flags to control the build. Use -DFLAG=VALUE to set them.

Option name Values Default Notes
CMAKE_BUILD_TYPE Release/Debug Release
BUILD_SHARED_LIBS ON/OFF OFF
KMSXX_ENABLE_PYTHON ON/OFF ON
KMSXX_ENABLE_KMSCUBE ON/OFF OFF
KMSXX_PYTHON_VERSION python3/python2 python3;python2 Name of the python pkgconfig file

Env variables

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

Variable Description
KMSXX_DISABLE_UNIVERSAL_PLANES Set to disable the use of universal planes
KMSXX_DISABLE_ATOMIC Set to disable the use of atomic modesetting

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