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LookingGlass/client/README.md
A.J. Ruckman dec4c8533c [client] win: add new option win:shrinkOnUpscale 
This option constrains the client's window dimensions to the guest's resolution when 'dontUpscale' is also enabled
2021-04-29 13:35:00 +10:00

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# Looking Glass Client
This is the Looking Glass client application that is designed to work in tandem with the Looking Glass Host application
---
## Building the Application
### Build Dependencies
* binutils-dev
* cmake
* fonts-freefont-ttf
* libsdl2-dev
* libsdl2-ttf-dev
* libspice-protocol-dev
* libfontconfig1-dev
* libx11-dev
* nettle-dev
* libxss-dev
* libxi-dev
#### Debian (and maybe Ubuntu)
apt-get install binutils-dev cmake fonts-freefont-ttf libsdl2-dev libsdl2-ttf-dev libspice-protocol-dev libfontconfig1-dev libx11-dev nettle-dev libxss-dev libxi-dev
### Building
mkdir build
cd build
cmake ../
make
Should this all go well you should be left with the file `looking-glass-client`
### Removing Wayland or X11 support
Wayland and/or X11 support can be disabled with the compile options
`ENABLE_WAYLAND=NO` and `ENABLE_X11=NO`. It is an error to disable both backends.
cmake ../ -DENABLE_WAYLAND=OFF
---
## Usage Tips
### Key Bindings
By default Looking Glass uses the `Scroll Lock` key as the escape key for commands as well as the input capture mode toggle, this can be changed using the `-m` switch if you desire a different key.
Below are a list of current key bindings:
| Command | Description |
|-|-|
| <kbd>ScrLk</kbd> | Toggle cursor screen capture |
| <kbd>ScrLk</kbd>+<kbd>F</kbd> | Full Screen toggle |
| <kbd>ScrLk</kbd>+<kbd>V</kbd> | Video stream toggle |
| <kbd>ScrLk</kbd>+<kbd>I</kbd> | Spice keyboard & mouse enable toggle |
| <kbd>ScrLk</kbd>+<kbd>N</kbd> | Toggle night vision mode (EGL renderer only!) |
| <kbd>ScrLk</kbd>+<kbd>R</kbd> | Rotate the output clockwise by 90 degree increments |
| <kbd>ScrLk</kbd>+<kbd>Q</kbd> | Quit |
| <kbd>ScrLk</kbd>+<kbd>Insert</kbd> | Increase mouse sensitivity (in capture mode only) |
| <kbd>ScrLk</kbd>+<kbd>Del</kbd> | Decrease mouse sensitivity (in capture mode only) |
| <kbd>ScrLk</kbd>+<kbd>F1</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F1</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F2</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F2</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F3</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F3</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F4</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F4</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F5</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F5</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F6</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F6</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F7</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F7</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F8</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F8</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F9</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F9</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F10</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F10</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F11</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F11</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>F12</kbd> | Send <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>F12</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>LWin</kbd> | Send <kbd>LWin</kbd> to the guest |
| <kbd>ScrLk</kbd>+<kbd>RWin</kbd> | Send <kbd>RWin</kbd> to the guest |
### Setting options via command line arguments
The syntax is simple: `module:name=value`, for example:
./looking-glass-client win:fullScreen=yes egl:nvGain=1
### Setting options via configuration files
By default the application will look for and load the config files in the following locations
* /etc/looking-glass-client.ini
* ~/.looking-glass-client.ini
The format of this file is the commonly known INI format, for example:
[win]
fullScreen=yes
[egl]
nvGain=1
Command line arguments will override any options loaded from the config files.
### Supported options
```
|--------------------------------------------------------------------------------------------------------------------------------------------------|
| Long | Short | Value | Description |
|--------------------------------------------------------------------------------------------------------------------------------------------------|
| app:configFile | -C | NULL | A file to read additional configuration from |
| app:renderer | -g | auto | Specify the renderer to use |
| app:license | -l | no | Show the license for this application and then terminate |
| app:cursorPollInterval | | 1000 | How often to check for a cursor update in microseconds |
| app:framePollInterval | | 1000 | How often to check for a frame update in microseconds |
| app:allowDMA | | yes | Allow direct DMA transfers if possible (VM-VM only for now) |
| app:shmFile | -f | /dev/shm/looking-glass | The path to the shared memory file, or the name of the kvmfr device to use, ie: kvmfr0 |
|--------------------------------------------------------------------------------------------------------------------------------------------------|
|---------------------------------------------------------------------------------------------------------------------------------|
| Long | Short | Value | Description |
|---------------------------------------------------------------------------------------------------------------------------------|
| win:title | | Looking Glass (client) | The window title |
| win:position | | center | Initial window position at startup |
| win:size | | 1024x768 | Initial window size at startup |
| win:autoResize | -a | no | Auto resize the window to the guest |
| win:allowResize | -n | yes | Allow the window to be manually resized |
| win:keepAspect | -r | yes | Maintain the correct aspect ratio |
| win:forceAspect | | yes | Force the window to maintain the aspect ratio |
| win:dontUpscale | | no | Never try to upscale the window |
| win:shrinkOnUpscale | | no | Limit the window dimensions when dontUpscale is enabled |
| win:borderless | -d | no | Borderless mode |
| win:fullScreen | -F | no | Launch in fullscreen borderless mode |
| win:maximize | -T | no | Launch window maximized |
| win:minimizeOnFocusLoss | | yes | Minimize window on focus loss |
| win:fpsMin | -K | -1 | Frame rate minimum (0 = disable - not recommended, -1 = auto detect) |
| win:showFPS | -k | no | Enable the FPS & UPS display |
| win:ignoreQuit | -Q | no | Ignore requests to quit (ie: Alt+F4) |
| win:noScreensaver | -S | no | Prevent the screensaver from starting |
| win:alerts | -q | yes | Show on screen alert messages |
| win:quickSplash | | no | Skip fading out the splash screen when a connection is established |
| win:rotate | | 0 | Rotate the displayed image (0, 90, 180, 270) |
|---------------------------------------------------------------------------------------------------------------------------------|
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| Long | Short | Value | Description |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| input:grabKeyboard | -G | no | Grab the keyboard in capture mode |
| input:grabKeyboardOnFocus | | no | Grab the keyboard when focused |
| input:releaseKeysOnFocusLoss | | yes | On focus loss, send key up events to guest for all held keys |
| input:escapeKey | -m | 70 = KEY_SCROLLLOCK | Specify the escape key, see <linux/input-event-codes.h> for valid values |
| input:ignoreWindowsKeys | | no | Do not pass events for the windows keys to the guest |
| input:hideCursor | -M | yes | Hide the local mouse cursor |
| input:mouseSens | | 0 | Initial mouse sensitivity when in capture mode (-9 to 9) |
| input:mouseSmoothing | | yes | Apply simple mouse smoothing when rawMouse is not in use (helps reduce aliasing) |
| input:rawMouse | | no | Use RAW mouse input when in capture mode (good for gaming) |
| input:mouseRedraw | | yes | Mouse movements trigger redraws (ignores FPS minimum) |
| input:autoCapture | | no | Try to keep the mouse captured when needed |
| input:captureOnly | | no | Only enable input via SPICE if in capture mode |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
|------------------------------------------------------------------------------------------------------------------|
| Long | Short | Value | Description |
|------------------------------------------------------------------------------------------------------------------|
| spice:enable | -s | yes | Enable the built in SPICE client for input and/or clipboard support |
| spice:host | -c | 127.0.0.1 | The SPICE server host or UNIX socket |
| spice:port | -p | 5900 | The SPICE server port (0 = unix socket) |
| spice:input | | yes | Use SPICE to send keyboard and mouse input events to the guest |
| spice:clipboard | | yes | Use SPICE to syncronize the clipboard contents with the guest |
| spice:clipboardToVM | | yes | Allow the clipboard to be syncronized TO the VM |
| spice:clipboardToLocal | | yes | Allow the clipboard to be syncronized FROM the VM |
| spice:scaleCursor | -j | yes | Scale cursor input position to screen size when up/down scaled |
| spice:captureOnStart | | no | Capture mouse and keyboard on start |
| spice:alwaysShowCursor | | no | Always show host cursor |
|------------------------------------------------------------------------------------------------------------------|
|--------------------------------------------------------------------------------------------------------------|
| Long | Short | Value | Description |
|--------------------------------------------------------------------------------------------------------------|
| egl:vsync | | no | Enable vsync |
| egl:doubleBuffer | | no | Enable double buffering |
| egl:multisample | | yes | Enable Multisampling |
| egl:nvGainMax | | 1 | The maximum night vision gain |
| egl:nvGain | | 0 | The initial night vision gain at startup |
| egl:cbMode | | 0 | Color Blind Mode (0 = Off, 1 = Protanope, 2 = Deuteranope, 3 = Tritanope) |
|--------------------------------------------------------------------------------------------------------------|
|------------------------------------------------------------------------------------|
| Long | Short | Value | Description |
|------------------------------------------------------------------------------------|
| opengl:mipmap | | yes | Enable mipmapping |
| opengl:vsync | | no | Enable vsync |
| opengl:preventBuffer | | yes | Prevent the driver from buffering frames |
| opengl:amdPinnedMem | | yes | Use GL_AMD_pinned_memory if it is available |
|------------------------------------------------------------------------------------|
|-------------------------------------------------------------|
| Long | Short | Value | Description |
|-------------------------------------------------------------|
| wayland:warpSupport | | yes | Enable cursor warping |
|-------------------------------------------------------------|
```
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