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[doc] host: Imported from host/README.md
Placed at bottom of Technical FAQ to hide it host/README.md removed
This commit is contained in:
Jonathan Rubenstein
committed by
Geoffrey McRae
Geoffrey McRae
parent
2bee8d91b0
commit
5fb6c73263
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host/README.md
123
host/README.md
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# General Questions
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## What is this?
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The Looking Glass Host application for the Guest Virtual Machine.
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## What platforms does this support?
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Currently only Windows is supported however there is some initial support for Linux at this time.
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## How do I build it?
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#### For Windows on Windows
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1. download and install msys2 x86_64 from http://www.msys2.org/ following the setup instructions provided
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3. execute `pacman -Fy` and then `pacman -Sy git make mingw-w64-x86_64-gcc mingw-w64-x86_64-cmake`
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4. run "C:\msys64\mingw64.exe"
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5. checkout the project
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`git clone https://github.com/gnif/LookingGlass.git`
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6. configure the project and build it
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```
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mkdir LookingGlass/host/build
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cd LookingGlass/host/build
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cmake -G "MSYS Makefiles" ..
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make
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```
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#### For Linux on Linux
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```
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mkdir build
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cd build
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cmake ..
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make
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```
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#### For Windows cross compiling on Linux
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```
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mkdir build
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cd build
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cmake -DCMAKE_TOOLCHAIN_FILE=../toolchain-mingw64.cmake ..
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make
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```
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## Building the Windows installer
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Install NSIS compiler
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Build the host program, see above sections.
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Build installer with `makensis platform/Windows/installer.nsi`
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The resulting installer will be at
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`platform/Windows/looking-glass-host-setup.exe`
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## Where is the log?
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The log file for the host application is located at:
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%ProgramData%\Looking Glass (host)\looking-glass-host.txt
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You can also find out where the file is by right clicking on the tray icon and
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selecting "Log File Location".
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The log file for the looking glass service is located at:
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%ProgramData%\Looking Glass (host)\looking-glass-host-service.txt
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This is useful for troubleshooting errors related to the host application not
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starting.
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### High priority capture using DXGI and Secure Desktop (UAC) capture support
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By default Windows gives priority to the foreground application for any GPU
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work which causes issues with capture if the foreground application is consuming
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100% of the available GPU resources. The looking glass host application is able
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to increase the kernel GPU thread to realtime priority which fixes this, but in
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order to do so it must run as the `SYSTEM` user account. To do this, Looking
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Glass needs to run as a service. This can be accomplished by either using the
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NSIS installer which will do this for you, or you can use the following command
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to Install the service manually:
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looking-glass-host.exe InstallService
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To remove the service use the following command:
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looking-glass-host.exe UninstallService
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This will also enable the host application to capture the secure desktop which
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includes things like the lock screen and UAC prompts.
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## Why does this version require Administrator privileges
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This is intentional for several reasons.
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1. NvFBC requires a system wide hook to correctly obtain the cursor position as NVIDIA decided to not provide this as part of the cursor updates.
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2. NvFBC requires administrator level access to enable the interface in the first place. (WIP)
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3. DXGI performance can be improved if we have this. (WIP)
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## NvFBC (NVIDIA Frame Buffer Capture)
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### Why isn't there a build with NvFBC support available.
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~~Because NVIDIA have decided to put restrictions on the NvFBC API that simply make it incompatible with the GPL/2 licence. Providing a pre-built binary with NvFBC support would violate the EULA I have agreed to in order to access the NVidia Capture SDK.~~
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Either I miss-read the License Agreement or it has been updated, it is now viable to produce a "derived work" from the capture SDK.
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> 1.1 License Grant. Subject to the terms of this Agreement, NVIDIA hereby grants you a nonexclusive, non-transferable, worldwide,
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revocable, limited, royalty-free, fully paid-up license during the term of this Agreement to:
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> (i) install, use and reproduce the Licensed Software delivered by NVIDIA plus make modifications and create derivative
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works of the source code and header files delivered by NVIDIA, provided that the software is executed only in hardware products as
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specified by NVIDIA in the accompanying documentation (such as release notes) as supported, to develop, test and service your
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products (each, a “Customer Product”) that are interoperable with supported hardware products. If the NVIDIA documentation is
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silent, the supported hardware consists of certain NVIDIA GPUs; and
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To be safe we are still not including the NVIDIA headers in the repository, but I am now providing pre-built binaries with NvFBC support included.
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See: https://looking-glass.hostfission.com/downloads
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### Why can't I compile NvFBC support into the host
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You must download and install the NVidia Capture SDK. Please note that by doing so you will be agreeing to NVIDIA's SDK License agreement.
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_-Geoff_
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