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# libkms++ - C++ library for kernel mode setting
libkms++ is a C++11 library for kernel mode setting.
Also included are some simple utilities for KMS and python bindings for libkms++.
## Utilities
- testpat - 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
```
## 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 |
LIBKMS_ENABLE_PYTHON | ON/OFF | ON |
LIBKMS_ENABLE_KMSCUBE | ON/OFF | OFF |
## Env variables
You can use the following runtime environmental variables to control the behavior of libkms.
Variable | Description
--------------------------------- | -------------
LIBKMSXX_DISABLE_UNIVERSAL_PLANES | Set to disable the use of universal planes
LIBKMSXX_DISABLE_ATOMIC | Set to disable the use of atomic modesetting
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