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[doc] update host usage documentation

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@ -219,128 +219,226 @@ the *Preset name* pull down. Presets are persistent and are stored on disk at
All command line options
~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block::
+------------------------+-------+------------------------+-----------------------------------------------------------------------------------------+
+------------------------+-------+-------------+-----------------------------------------------------------------------------------------+
| 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:renderer | -g | EGL | 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 supported (see `README.md` in the `module` dir) |
| app:shmFile | -f | /dev/shm/looking-glass | The path to the shared memory file, or the name of the kvmfr device to use, e.g. kvmfr0 |
+------------------------+-------+------------------------+-----------------------------------------------------------------------------------------+
+------------------------+-------+-------------+-----------------------------------------------------------------------------------------+
| app:shmFile | -f | /dev/kvmfr0 | The path to the shared memory file, or the name of the kvmfr device to use, e.g. 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:intUpscale | | no | Allow only integer upscaling |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| 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 | | no | Minimize window on focus loss |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:fpsMin | -K | -1 | Frame rate minimum (0 = disable - not recommended, -1 = auto detect) |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:ignoreQuit | -Q | no | Ignore requests to quit (i.e. Alt+F4) |
| win:noScreensaver | -S | no | Prevent the screensaver from starting |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:noScreensaver | -S | yes | Prevent the screensaver from starting |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:autoScreensaver | | no | Prevent the screensaver from starting when guest requests it |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:alerts | -q | yes | Show on screen alert messages |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:quickSplash | | no | Skip fading out the splash screen when a connection is established |
| win:overlayDimsDesktop | | yes | Dim the desktop when in interactive overlay mode |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:overlayDimsDesktop | | no | Dim the desktop when in interactive overlay mode |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:rotate | | 0 | Rotate the displayed image (0, 90, 180, 270) |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:uiFont | | DejaVu Sans Mono | The font to use when rendering on-screen UI |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:uiSize | | 14 | The font size to use when rendering on-screen UI |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:jitRender | | no | Enable just-in-time rendering |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:requestActivation | | yes | Request activation when attention is needed |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
| win:showFPS | -k | no | Enable the FPS & UPS display |
+-------------------------+-------+------------------------+----------------------------------------------------------------------+
+------------------------------+-------+---------------------+----------------------------------------------------------------------------------+
| Long | Short | Value | Description |
+==============================+=======+=====================+==================================================================================+
| input:captureOnFocus | | no | Enable capture mode when the window becomes focused |
+------------------------------+-------+---------------------+----------------------------------------------------------------------------------+
| input:grabKeyboard | -G | yes | 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/menu key to use (use "help" to see 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:rawMouse | | yes | 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 |
+------------------------------+-------+---------------------+----------------------------------------------------------------------------------+
| input:helpMenuDelay | | 200 | Show help menu after holding down the escape key for this many milliseconds |
+------------------------------+-------+---------------------+----------------------------------------------------------------------------------+
+------------------------+-------+-----------+---------------------------------------------------------------------+
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| 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:host | -c | /opt/PVM/vms/Windows/windows.sock | The SPICE server host or UNIX socket |
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| spice:port | -p | 0 | 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 synchronize the clipboard contents with the guest |
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| spice:clipboardToVM | | yes | Allow the clipboard to be synchronized TO the VM |
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| spice:clipboardToLocal | | yes | Allow the clipboard to be synchronized FROM the VM |
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| spice:audio | | yes | Enable SPICE audio support |
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| 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 |
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| spice:showCursorDot | | yes | Use a "dot" cursor when the window does not have focus |
+------------------------+-------+-----------+---------------------------------------------------------------------+
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
| spice:largeCursorDot | | yes | Use a larger version of the "dot" cursor |
+------------------------+-------+-----------------------------------+---------------------------------------------------------------------+
+------------------------+-------+--------+-------------------------------------------------------------------------------+
+------------------------+-------+-------+-------------------------------------------------------------------------------+
| Long | Short | Value | Description |
+------------------------+-------+--------+-------------------------------------------------------------------------------+
| audio:periodSize | | 2048 | Requested audio device period size in samples |
| audio:bufferLatency | | 13 | Additional buffer latency in milliseconds |
| audio:micDefault | | prompt | Default action when an application opens the microphone (prompt, allow, deny) |
+========================+=======+=======+===============================================================================+
| audio:periodSize | | 256 | Requested audio device period size in samples |
+------------------------+-------+-------+-------------------------------------------------------------------------------+
| audio:bufferLatency | | 12 | Additional buffer latency in milliseconds |
+------------------------+-------+-------+-------------------------------------------------------------------------------+
| audio:micDefault | | allow | Default action when an application opens the microphone (prompt, allow, deny) |
+------------------------+-------+-------+-------------------------------------------------------------------------------+
| audio:micShowIndicator | | yes | Display microphone usage indicator |
+------------------------+-------+--------+-------------------------------------------------------------------------------+
+------------------------+-------+-------+-------------------------------------------------------------------------------+
| audio:syncVolume | | yes | Synchronize the volume level with the guest |
+------------------------+-------+-------+-------------------------------------------------------------------------------+
+------------------+-------+-------+---------------------------------------------------------------------------+
+-------------------+-------+-------+---------------------------------------------------------------------------+
| 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) |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:scale | | 0 | Set the scale algorithm (0 = auto, 1 = nearest, 2 = linear) |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:debug | | no | Enable debug output |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:noBufferAge | | no | Disable partial rendering based on buffer age |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:noSwapDamage | | no | Disable swapping with damage |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:scalePointer | | yes | Keep the pointer size 1:1 when downscaling |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:mapHDRtoSDR | | yes | Map HDR content to the SDR color space |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:peakLuminance | | 250 | The peak luminance level in nits for HDR to SDR mapping |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:maxCLL | | 10000 | Maximum content light level in nits for HDR to SDR mapping |
+-------------------+-------+-------+---------------------------------------------------------------------------+
| egl:preset | | NULL | The initial filter preset to load |
+------------------+-------+-------+---------------------------------------------------------------------------+
+-------------------+-------+-------+---------------------------------------------------------------------------+
+----------------------+-------+-------+---------------------------------------------+
| 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 |
+-----------------------+-------+-------+-------------------------+
| wayland:fractionScale | | yes | Enable fractional scale |
+-----------------------+-------+-------+-------------------------+
+---------------------+-------+-------+----------------------------------------------------------+
| Long | Short | Value | Description |
+=====================+=======+=======+==========================================================+
| i3:globalFullScreen | | yes | Use i3's global full screen feature (spans all monitors) |
+---------------------+-------+-------+----------------------------------------------------------+
+--------------------+-------+---------------+------------------------------------+
| Long | Short | Value | Description |
+====================+=======+===============+====================================+
| pipewire:outDevice | | Looking Glass | The default playback device to use |
+--------------------+-------+---------------+------------------------------------+
| pipewire:recDevice | | PureNoise Mic | The default record device to use |
+--------------------+-------+---------------+------------------------------------+
.. _host_usage:
Host usage
@ -363,7 +461,7 @@ Capture interface
Currently we only provide support for the Windows host application, Linux
options are not currently documented.
Currently under windows there are two capture interfaces available for use,
Currently under windows there are three capture interfaces available for use,
by default the most compatible and commonly supported interface is selected
however this can be changed via the ini file with the following configuration:
@ -372,17 +470,10 @@ however this can be changed via the ini file with the following configuration:
[app]
capture=<INTERFACE>
Where ``<INTERFACE>`` is one of ``dxgi`` or ``nvfbc``
Where ``<INTERFACE>`` is one of ``d12``, ``dxgi`` or ``nvfbc``
.. _host_capture_dxgi:
Microsoft DXGI Desktop Duplication
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This interface (DXGI) is the default and most compatible capture interface for
windows, unfortunately though it does suffer from several drawbacks over other
options. DXGI capture can operate in two modes, DirectX 11 (default) or the
experimental and unofficial DirectX 12 mode.
DXGI Desktop Duplication Caveat
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Due to the design of Microsoft's DXGI API and the decision made to roll
hardware cursor updates into the capture stream this interface can suffer from
@ -391,78 +482,105 @@ guest applications that make use of the hardware cursor instead of compositing
the cursor directly, as such titles that do not use a mouse (most FPV games)
are not affected.
The other drawback of this API is the overall system overhead, however this can
be mitigated by using the DirectX 12 backend. Please be aware though that this
backend is not experimental because its new, but rather it's a slight
abuse/misuse of the DXGI API and allows us to bypass some Windows internals.
Most people will not even notice this, but it needs to be said for those that
do so that we do not get flooded with support requests for something we can not
fix.
To enable the DirectX 12 backend the following configuration needs to be added
to the ``looking-glass-host.ini`` configuration:
.. _host_capture_d12:
.. code:: ini
DirectX 12 DXGI Desktop Duplication
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[app]
capture=dxgi
This interface (``D12``) is the default and most performant capture interface
for Windows 10 and later having been introduced with the Beta 7 release of
Looking Glass. Impressively this new capture engine is faster then NvFBC, and
has fewer overheads. This is because this interface can capture and download
the captured frames directly from the GPU into the shared memory interface.
[dxgi]
copyBackend=d3d12
d3d12CopySleep=5
disableDamage=false
D12 Configuration Options
"""""""""""""""""""""""""
The option ``d3d12CopySleep`` is to work around the lack of locking this misuse
of the API allows and you will need to tune this value to what suits your
hardware best. The default value is 5ms as this should work for most, lowing
it below 2ms is doubtful to be of practical use to anyone. If this value is too
low you may see screen corruption which is usually most evident while dragging
a window around on the Windows desktop.
* ``adapter`` - The name of the specific adapter you wish to capture
.. note::
Lowering d3d12CopySleep can improve the UPS however the UPS metric makes
little sense when using the d3d12 backend as if this value is too low
unchanged frames will be doubled up.
* ``output`` - The name of the specific output you wish to capture
The ``disableDamage`` option may be needed to avoid screen corruption. Note
that this will increase the bandwidth required and in turn the overall load on
your system.
* ``trackDamage`` - Default enabled, this saves bandwidth by only updating and
transferring the regions of the capture that have changed since the last
frame.
The DXGI capture interface also offers a feature that allows downsampling the
captured frames in the guest GPU before transferring them to shared memory.
This feature is very useful if you are super scaling for better picture quality
and wish to reduce system memory pressure.
* ``debug`` - Enables DirectX 12 debugging and validation, only enable this if
you're having problems and have been told to do so by our support team. Note
that you must have the DirectX SDK installed for this to work.
The configuration for this is fairly straightforward and is defined as set of
rules to determine when to perform this downsampling. The format is as follows:
* ``downsample`` - See :ref:`host_downsampling`
.. code:: ini
* ``HDR16to10`` - Converts HDR16/8bpp content to HDR10/4bpp to save bandwidth.
Note that this incurs additional overheads in the guest and may decrease
performance. Default enabled, but only active if HDR is enabled in Windows.
[dxgi]
downsample=RULE1,RULE2,RULE3
* ``allowRGB24`` - Losslessly packs 32-bit RGBA8 content into 24-bit RGB by
omitting the unused alpha channel. This saves bandwidth but requires
additional processing so may not yield a performance increase. Might be
helpful if you're already bandwidth constrained. Default disabled.
The rules are written as follows:
.. _host_capture_dxgi:
.. code::
DirectX 11 DXGI Desktop Duplication
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
(>|>=)(WIDTH)x(HEIGHT):(LEVEL)
This interface (``DXGI``) is the most compatible capture interface for Windows,
unfortunately though it does suffer from several drawbacks over other options.
If the DirectX 12 (``D12``) capture interface fails to initialize Looking Glass
will automatically fall back to using this capture interface instead.
The ``LEVEL`` is the fractional scale level where 1 = 50%, 2 = 25%, 3 = 12.5%.
Due to the design of Microsoft's DXGI API and the decision made to roll
hardware cursor updates into the capture stream this interface can suffer from
microstutters when the mouse is being moved/updated. This issue only affects
guest applications that make use of the hardware cursor instead of compositing
the cursor directly, as such titles that do not use a mouse (most FPV games)
are not affected.
**Examples:**
The other drawback of this API is the overall system overhead as it requires
copying the captured frames into a staging buffer before it is copied into the
shared memory area.
.. code:: ini
DXGI Configuration Options
""""""""""""""""""""""""""
[dxgi]
; Downsample anything greater then 1920x1080 to 50% of its original size
downsample=>1920:1080:1
* ``adapter`` - The name of the specific adapter you wish to capture
; Downsample exactly 1920x1080 to 25% of its original size, and anything greater
; then 1920x1080 to 50% of its original size.
downsample=1920x1080:1,>1920x1080:2
* ``output`` - The name of the specific output you wish to capture
; Downsample anything greater or equal to 1920x1080 to 50% of its original size
downsample=>=1920x1080:1
* ``maxTextures`` - The maximum number of frames to buffer before skipping
frames. Default is 4 however realistically the this limit should never be
reached unless the Looking Glass client application is not keeping up.
* ``useAcquireLock`` - Enable locking around ``AcquireNextFrame``. This is an
experimental feature and should be left enabled if you're not sure. Default
is enabled.
* ``dwmFlush`` - Use ``DwmFlush`` to sync the capture to the windows
presentation interval. This is experimental and may degrade performance.
Default is disabled.
* ``disableDamage`` - Default is false. This disables damage tracking which
normally would save bandwidth by only updating and transferring the regions
of the capture that have changed since the last frame.
* ``debug`` - Enables DirectX 11 debugging, only enable this if you're having
problems and have been told to do so by our support team. Note that you must
have the DirectX SDK installed for this to work.
* ``allowRGB24`` - Losslessly packs 32-bit RGBA8 content into 24-bit RGB by
omitting the unused alpha channel. This saves bandwidth but requires
additional processing so may not yield a performance increase. Might be
helpful if you're already bandwidth constrained. Default enabled.
* ``downsample`` - See :ref:`host_downsampling`
.. _host_capture_nvfbc:
NVIDIA Frame Buffer Capture
^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -475,6 +593,11 @@ If you are able to make use/enable this this feature it offers lower overall
system load and lower latency capture, and does not suffer from the mouse
motion stutter issues that DXGI suffers from.
.. note::
As of Looking Glass Beta 7, the D12 capture interface is faster then NvFBC
while also reducing the memory bandwidth requirements. We recommend
migrating to D12 if at all possible.
To enable its usage use the following configuration in the
``looking-glass-host.ini`` file:
@ -487,43 +610,31 @@ If this feature is unavailable to you the host application will fail to start
and the host log will contain an error stating that the feature is not
available.
The NVFBC capture interface also offers a feature much like DXGI to allow
downsampling the captured frames in the guest GPU before transferring them to
shared memory. However unlike DXGI which is limited to fractional scaling,
NvFBC is able to scale to any arbitrary resolution.
NvFBC Configuration Options
"""""""""""""""""""""""""""
The configuration for this is fairly straight forward and is defined as set of
rules to determine when to perform this downsampling. The format is as follows:
* ``decoupleCursor`` - This option prevents the cursor from being composited
before capture onto the captured frame, and instead sends cursor updates to
the client independent of frame updates. Default is true.
.. code:: ini
* ``diffRes`` - The resolution of the differential map, see the NvFBC capture
SDK documentation for more information. Default is 128.
[nvfbc]
downsample=RULE1,RULE2,RULE3
* ``adapterIndex`` - If you have multiple adapters, you can select which to use
with this option. Default is to select the first valid device.
The rules are written as follows:
* ``dwmFlush`` - Use ``DwmFlush`` to sync the capture to the windows
presentation interval. This is experimental and may degrade performance.
Default is disabled.
.. code::
* ``noHDR`` - Force NvFBC to capture HDR content as SDR. Default is enabled.
(>|>=)(WIDTH)x(HEIGHT):(TARGET WIDTH)x(TARGET HEIGHT)
* ``downsample`` - See :ref:`host_downsampling`
**Examples:**
.. code:: ini
[nvfbc]
; Downsample exactly 3840x2160 to 1920x1080
downsample=3840x2160:1920x1080
; Downsample anything greater then 1920x1080 to 1920x1080
downsample=>1920x1080:1920x1080
; Downsample 3840x2160 to 1920x1080, or 3840x2400 to 1920x1200
downsample=3840x2160:1920x1080,3840x2400:1920x1200
This capture interface also looks for and reads the value of the system
environment variable ``NVFBC_PRIV_DATA`` if it has been set, documentation on
its usage however is unavailable.
its usage however is unavailable (Google is your friend).
.. _host_select_ivshmem:
@ -560,3 +671,35 @@ selected device)::
[I] 19989544 … IVSHMEM 0 on bus 0x6, device 0x3, function 0x0
[I] 19990438 … IVSHMEM 1* on bus 0x6, device 0x5, function 0x0
.. _host_downsampling:
Downsampling
~~~~~~~~~~~~
The host application is able to downsample the captured frame before transfer
to the client application, this provides an opportunity to save some bandwidth
on memory constrained systems. It also makes it possible to run the guest at a
substantially higher resolution then your actual monitor for a super scaling
type effect, without having to incur the bandwidth penalty that would normally
occur when doing this.
The configuration for this is fairly straightforward and is defined as set of
rules to determine when to perform this downsampling. The format is as follows:
.. code::
(>|>=)(WIDTH)x(HEIGHT):(TARGET WIDTH)x(TARGET HEIGHT)
**Examples:**
.. code:: ini
; Downsample exactly 3840x2160 to 1920x1080
downsample=3840x2160:1920x1080
; Downsample anything greater then 1920x1080 to 1920x1080
downsample=>1920x1080:1920x1080
; Downsample 3840x2160 to 1920x1080, or 3840x2400 to 1920x1200
downsample=3840x2160:1920x1080,3840x2400:1920x1200

3
doc/words.txt
View File

@ -19,6 +19,7 @@ dmesg
downsampling
downscaler
downscaling
downsample
fullscreen
gcc
globalFullScreen
@ -34,6 +35,7 @@ libpulse
libvirt
linux
LookingGlass
Losslessly
luminance
memballoon
MiB
@ -48,6 +50,7 @@ Nvidia
overlayed
pacman
passthrough
performant
pre
protanope
QEMU