IVI Homescreen for Wayland

• Strongly Typed (C++)
• Lightweight
  • Clang 11 Release Stripped = 151k
  • GCC 9.3 Release Stripped = 168k
• Source runs on Desktop and Yocto Linux
  • Ubuntu 18+
  • Fedora 33+
  • Yocto Dunfell+
• Platform Channels enabled/disabled via CMake
• OpenGL Texture Framework

This is the default build configuration. To manually build EGL Backend use

-DBUILD_BACKEND_WAYLAND_EGL=ON -DBUILD_BACKEND_WAYLAND_VULKAN=OFF

To build Vulkan Backend use

-DBUILD_BACKEND_WAYLAND_EGL=OFF -DBUILD_BACKEND_WAYLAND_VULKAN=ON

Running Vulkan requires an engine version that supports Vulkan. Stable does not yet support Vulkan.

If an override file is not present, it gets loaded from default location.

Bundle Override

{bundle path}/data/icudtl.dat

Yocto Default

/usr/share/flutter/icudtl.dat

Desktop Default

/usr/local/share/flutter/icudtl.dat

Bundle Override

{bundle path}/lib/libflutter_engine.so

Yocto/Desktop Default - https://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html

--a={int value} - Sets the Engine's initial state of Accessibility Feature support. Requires an integer value.

--c - Disables the cursor.

--d - Outputs backend debug information. If Vulkan and Validation Layer is available, it will be loaded.

--f - Sets window to fullscreen.

--w={int value} - Sets View width. Requires an integer value.

--h={int value} - Sets View height. Requires an integer value.

--t={String} - Sets cursor theme to load. e.g. --t=DMZ-White

--b={path to folder} - Sets the Bundle Path. A bundle path expects the following folder structure:

  Flutter Application (bundle folder)
    data/flutter_assets
    data/icudtl.dat (optional - overrides system path)
    lib/libapp.so
    lib/libflutter_engine.so (optional - overrides system path)

• --j= - Sets the JSON configuration file.

• Dart VM arguments - any additional command line arguments not handled get directly passed to the Dart VM instance.

app_id - Sets Application ID. Currently only the primary index app_id value is used.

cursor_theme - Sets cursor theme to use.

disable_cursor - Disables the cursor.

debug_backend - Enables Backend Debug logic.

view - Minimum required. Can be single object or array.

bundle_path - sets the Bundle Path.

window_type - Currently used for AGL Compositor Window Types. If not running on AGL compositor, it will create borderless windows in no particular position.

width - sets View width. Requires an integer value.

height - sets View height. Requires an integer value.

accessibility_features - Bitmask of Engine Accessibility Features. Requires an integer. See flutter_embedder.h for valid values.

vm_args - Array of strings which get passed to the VM instance as command line arguments.

fullscreen - Sets window to fullscreen.

fps_output_console - Setting to 1 FPS count is output to stdout.

fps_output_overlay - If "fps_output_console"=1 and "fps_output_overlay"=1 the screen overlay is enabled.

fps_output_frequency - Optional for FPS. Changing value controls the update interval.

Minimum definition when using --j=

{"view":{}}

If you used this minimum definition, invocation would look something like this

homescreen --j=/tmp/min_cfg.json --b={bundle path} --h={view height} --w={view width}

Loads Two Views

1. Gallery app to a 1920x1280 Background window, passing two arguments to the Dart VM
2. Video player to Left Panel sized 320x240 with all accessibility features enabled.

/tmp/bg_left_rel.json

{
   "view":[
      {
         "bundle_path":"/home/joel/development/gallery/.homescreen/x86/release",
         "vm_args":["--enable-asserts", "--pause-isolates-on-start"],
         "window_type":"BG",
         "width":1920,
         "height":1280
      },
      {
         "bundle_path":"/home/joel/development/plugins/packages/video_player/video_player/example/.homescreen/x86/release",
         "window_type":"PANEL_LEFT",
         "width":320,
         "height":240,
         "accessibility_features":31
      }
   ]
}

homescreen --j=/tmp/bg_left_rel.json

Loads Single View

1. Fullscreen Gallery app, cursor disabled, backend debug enabled, passing vm_args values to the Dart VM

/tmp/bg_dbg.json

{
   "disable_cursor":true,
   "debug_backend":true,
   "accessibility_features":31,
   "view":{
      "bundle_path":"/home/joel/development/gallery/.homescreen/x86/release",
      "vm_args":["--no-serve-devtools"],
      "width":1920,
      "height":1280,
      "fullscreen":true
   }
}

homescreen --j=/tmp/bg_dbg.json

Only VM Command Line arguments are additive. Meaning all instances of VM command line references will get added together; JSON view + JSON global + CLI args.

All other parameters get assigned using the following ordering:

1. JSON Configuration View object parameters
2. JSON Configuration Global (non-view) parameters
3. Command Line parameters (Overrides View and Global parameters)

Log out if logged in Login screen Click on username field Right-click on the gear icon below username field, and select "Ubuntu on Wayland" Enter password and login

Defaults to Wayland, no need to do anything special

sudo add-apt-repository ppa:kisak/kisak-mesa
sudo apt-get update -y
sudo apt-get -y install libwayland-dev wayland-protocols \
mesa-common-dev libegl1-mesa-dev libgles2-mesa-dev mesa-utils \
libxkbcommon-dev

git clone https://github.com/toyota-connected-na/ivi-homescreen.git
mkdir build && cd build
cmake .. -DCMAKE_STAGING_PREFIX=`pwd`/out/usr/local
make install -j

git clone https://github.com/toyota-connected-na/ivi-homescreen.git
mkdir build && cd build
CC=/usr/lib/llvm-12/bin/clang CXX=/usr/lib/llvm-12/clang++ cmake .. -DCMAKE_STAGING_PREFIX=`pwd`/out/usr/local
make install -j

wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
sudo ./llvm.sh 12
sudo apt-get install -y libc++-12-dev libc++abi-12-dev libunwind-dev

https://github.com/toyota-connected-na/ivi-homescreen/blob/main/.github/workflows/ivi-homescreen-linux.yml

make package -j
sudo apt install ./ivi-homescreen-1.0.0-Release-beta-Linux-x86_64.deb

Confirm flutter/bin is in the path using: flutter doctor -v

cd ~/development/my_flutter_app
flutter channel beta
flutter upgrade
flutter config --enable-linux-desktop
flutter create .
flutter build bundle

loading path for application is: /usr/local/share/homescreen/bundle

This is used to leverage symlinks. Such as:

cd /usr/local/share/homescreen
sudo rm -rf bundle
sudo ln -sf ~/development/my_flutter_app/build/ bundle

Or

sudo mkdir -p /usr/local/share/homescreen/my_flutter_app/
sudo cp -r build/* /usr/local/share/homescreen/my_flutter_app/
sudo ln -sf /usr/local/share/homescreen/my_flutter_app/ bundle

Copy a current icudtl.dat to /usr/local/share/flutter Copy libflutter_engine.so to /usr/local/lib or use LD_LIBRARY_PATH to point downloaded engine for build:

cd <homescreen build>
export LD_LIBRARY_PATH=`pwd`:$LD_LIBRARY_PATH
homescreen

Setup custom devices to control ivi-homescreen via debugger.

Path prefix used to determine required files is determined at build.

For desktop CMAKE_INSTALL_PREFIX defaults to /usr/local For target Yocto builds CMAKE_INSTALL_PREFIX defaults to /usr

https://github.com/meta-flutter/meta-flutter/tree/kirkstone/recipes-graphics/toyota

https://github.com/meta-flutter/meta-flutter/tree/dunfell/recipes-graphics/toyota