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[](https://travis-ci.org/tomba/kmsxx)
# 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 name | Values | Default | Notes
---------------- | ------------- | --------------- | --------
pykms | true, false | true | Python bindings
kmscube | true, false | false | GLES kmscube
omap | enabled, disabled, auto | auto | libdrm-omap support
## 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
KMSXX_DEVICE | Path to the card device node to use
KMSXX_DRIVER | Name 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
```
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