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# libkms++ - C++ library for kernel mode setting
libkms++ is a C++11 library for kernel mode setting.
Also included are simple test tools for KMS and python wrapper for libkms++.
## Test tools
- kmsprint - print information about DRM objects
- testpat - set modes and show test pattern on crtcs/planes
- kmsview - view raw images
- db - simple double-buffering test
- kmscube - rotating 3D cube on crtcs/planes
## Dependencies:
- libdrm
- SWIG 3.x (for python bindings)
- Python 3.x (for python bindings)
## Build instructions:
```
$ mkdir build
$ cd build
$ cmake ..
$ make -j4
```
## Cross compiling instructions:
Directions for cross compiling depend on your environment. These are for mine (buildroot):
As above, but specify `-DCMAKE_TOOLCHAIN_FILE=<path>/your-toolchain.cmake` for cmake, where your-toolchain.cmake is something similar to:
```
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 |
LIBKMS_ENABLE_PYTHON | ON/OFF | ON |
LIBKMS_ENABLE_KMSCUBE | ON/OFF | OFF |
LIBKMS_ENABLE_LTO | ON/OFF | OFF | Link Time Optimization
## 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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