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| ''See also [[City of Heroes on Mac]]''
| | {{see also|City of Heroes on Mac|City of Heroes on Steam Deck}} |
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| {{EdNote|note=Homecoming Developers do not support any client bugs on Linux. If an issue cannot be reproduced in a Windows client, Linux specific bugs will be given a form response and closed without resolution. Please use the [https://forums.homecomingservers.com/forum/12-help-amp-support/ Homecoming Forums] for Linux client support from other users.}} | | {{EdNote|note=Homecoming Developers do not support any client bugs on Linux. If an issue cannot be reproduced in a Windows client, Linux specific bugs will be given a form response and closed without resolution. Please use the [https://forums.homecomingservers.com/forum/12-help-amp-support/ Homecoming Forums] for Linux client support from other users.}} |
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| ''For sake of brevity, we'll assume you have a working Linux installation that is fully patched. The distro does not matter. Also assuming a 64-bit system and you can replace '''"usernameGoesHere"''' below with your Linux username where needed.'' | | ''For sake of brevity, we'll assume you have a working Linux installation that is fully patched. The distro does not matter. Also assuming a 64-bit system and you can replace '''"usernameGoesHere"''' below with your Linux username where needed.'' |
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| *Install Wine Stable using this download page -- https://wiki.winehq.org/Download -- Once there, pick Binaries, and your distribution. Follow the instructions for the Stable branch. | | ''Using a Steam Deck? An install script is available on [[City of Heroes on Steam Deck]].'' |
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| | *Install Wine Stable using this download page -- https://wiki.winehq.org/Download |
| *Once installed the default Wine Prefix (/home/usernameGoesHere/.wine) will be made. It will prompt to install Gecko and Mono. Note that NEITHER library is necessary to run Homecoming: City of Heroes (although Mono will be useful if you wish to use Mids Reborn or other .NET apps later.) Another note worthy of mention -- it is not prompted during setup but you do NOT need to install Visual C++ Runtime at all. Wine handles this requirement automatically. | | *Once installed the default Wine Prefix (/home/usernameGoesHere/.wine) will be made. It will prompt to install Gecko and Mono. Note that NEITHER library is necessary to run Homecoming: City of Heroes (although Mono will be useful if you wish to use Mids Reborn or other .NET apps later.) Another note worthy of mention -- it is not prompted during setup but you do NOT need to install Visual C++ Runtime at all. Wine handles this requirement automatically. |
| *Do one of the following (optional):
| | *Run the Homecoming Installer. Choosing a location on drive C will try to install Homecoming in ~/.wine (eg C:\Games\Homecoming -> ~/.wine/drive_c/Games/Homecoming); Z: is the root Linux drive (so Z:\Games\Homecoming would correspond to /Games/Homecoming; an ordinary user account would not have permission to create this directory). |
| :*Any Graphic Cards new from 2016 onward: Install either Lutris (GUI Launcher, check your package manager) or DXVK (Vulkan Library - https://github.com/doitsujin/dxvk - follow the instructions in the GitHub page using a terminal.) Lutris prepacks the DXVK library and is easier for new users if you don't want to touch terminal too much. Installing DXVK yourself takes up less overhead.
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| :*Ubuntu and NVidia: Open "Additional Drivers" and make sure "Nouveau" is NOT selected. The NVIDIA 440 driver and newer will run City of Heroes (The NVIDIA 340 driver will work if you're on an older card.) For most users this is automatically handled (Pop_OS, etc.) but if the game performs terribly, please check this area before you give up.
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| *Run the Homecoming Installer. Choose your location on Drive C same as you would in Windows (C:\Games\Homecoming). | |
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| As with any file or folder starting with a period, ".wine" is hidden from directory results. (See upper right photo and caption.) Once installation finishes you can run the game from /home/usernameGoesHere/.wine/drive_C/Games/Homecoming/bin/win64/launcher.exe using either Lutris or making a shortcut to the location. (For a Gnome-based distro, for example, it could be as easy as visiting ~/.local/share/applications, then copying an existing shortcut and naming it Homecoming.desktop, and finally edit the new shortcut in a text editor with correct values.)
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| It is also important to note this procedure is sufficient for a single-user Linux system alone. For a multiuser system, either you need to repeat the procedure for each user (and sufficient disk space is required: 6-12GB per user), or configure permissions to allow multiple users access to the same WinePrefix. | | It is also important to note this procedure is sufficient for a single-user Linux system alone. For a multiuser system, either you need to repeat the procedure for each user (and sufficient disk space is required: 6-12GB per user), or configure permissions to allow multiple users access to the same WinePrefix. |
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| == System Requirements == | | == System Requirements == |
| Linux has different system requirements than Windows. For binary video card driver releases City of Heroes will only run on a current video driver that compiles with a Linux Kernel. When NVidia, AMD, or Intel drop driver support for a video card and the kernel fails to compile with the legacy driver in-place, you can no longer play City of Heroes on that system.
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| '''There is no specific date when this support ends; it will not be announced publicly when a software upgrade fails.''' The day that the video driver fails to recompile kernel modules for your current OS is when you need to decide. Possible fixes include:
| | As a generality, if a system would not be able to play City of Heroes using Windows because of the hardware in use there's a good chance Linux won't work either. |
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| | *1 GHz Dual Core processor (AMD/Intel 32 or 64 bit), |
| | *2GB of RAM, |
| | *a video card or integrated graphics support capable of OpenGL 2.0/3.0, |
| | *6-12GB free hard drive space. |
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| *Run COH on an older OS instead of on the bleeding edge (ex. choosing Ubuntu LTS over the twice-a-year update distro) so older drivers continue to compile normally,
| | '''Most systems made since 2018 should more than meet these requirements.''' The biggest factor is video support; in most cases performance will be either equivalent to, or have a slight performance increase (around 10%-20%) over Windows due to less overhead processes present in the OS. This varies due to the distribution used, graphics driver installed, and power consumption setting (such as a laptop on a battery, or any 'Eco mode' settings used.) |
| *Upgrade your hardware (baselines provided below to help in replacement), or
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| *set up your system to dual-boot to Windows and move your game files to Windows to continue play.
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| === Linux Driver Support === | | == Support Lifeline == |
| *AMD: Cards older than RX 300 no longer have active driver development. (Current baseline: AMD RX 400/500 and newer.)
| | Linux has one key difference over Windows for support: When NVidia, AMD, or Intel drop Linux driver support for a video card and the kernel fails to compile with the legacy driver in-place, you can no longer play City of Heroes on that system. '''There is no specific date when this support ends; it will not be announced publicly when a software upgrade fails.''' The day that the video driver fails to recompile kernel modules for your current OS is when you need to decide. Possible fixes include: |
| *NVidia: Cards older than GTX 500 no longer have active driver development. (Current baseline: NVidia GTX 600/700 and newer.)
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| *Intel: IGPs with GMA3000 or older are no longer patched. (Current baseline: Intel HD Graphics and newer.)
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| The above does not mean your older card will not work today. It means if it stops working in the distant future, this may be why.
| | *Run COH on an older OS (that still receives updates) so older drivers continue to compile normally, |
| | *Upgrade your hardware, or |
| | *Set up your system to dual-boot (or wipe and restore) Windows to continue play. |
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| === Must Meet Game System Requirements === | | == Unsupported Linux Hardware == |
| System Requirements are the same for a Linux system as they would be for a Windows system: 1 GHz Dual Core processor, 2GB of RAM, a video card capable of OpenGL 2.0/3.0, and 6-12GB free hard drive space. As a generality, if a system would not be able to play City of Heroes using Windows because of the hardware in use there's a good chance Linux won't work either.
| | The following Linux systems will not have the resources to play City of Heroes. |
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| === ARM Linux === | | === ARM Linux === |
| Homecoming Launcher (and more importantly the City of Heroes client) is not compiled for ARM. Wine will not run HCLauncher on an ARM system without a Software Emulator for X86 apps. Single-Board Computers (Raspberry Pi and variants) will not run City of Heroes with Wine alone. | | Homecoming Launcher (and more importantly the City of Heroes client) is not compiled for ARM. Wine will not run HCLauncher on an ARM system without a Software Emulator for X86 apps. Single-Board Computers (Raspberry Pi and variants) will not run City of Heroes with Wine alone. |
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| This also applies to Chromebooks with ARM chips (Rockchip, Qualcomm, Exynos, Tegra, etc.) A possible basis to start with would be QEMU, Box64, or a premade setup such as TwisterOS, but the broad swath of ARM systems available will not have sufficient hardware capability to expect useable performance to begin with.
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| === Chromebooks === | | === Chromebooks === |
| A Chromebook running a Linux partition can run City of Heroes if Wine is installed and the Chromebook has sufficient specs to run the game if it had Windows installed (ex: Pixelbook Go, Samsung Galaxy Chromebook). This is not advised for the following reasons:
| | As any Chromebook with an ARM chip is a non starter (see "ARM Linux" above this section), Chromebooks generally cannot run City of Heroes. The few exceptions out there either are discontinued models no longer supported, or cost more than a Windows Laptop which can run it far easier. |
| *Any Chromebook with an ARM chip is a non starter, see "ARM Linux" above this section.
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| *Chromebooks under $500 typically come with minimal storage (16-32GB) which makes it difficult to maintain sufficient free space. A device with at least 64GB storage is advised.
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| *Linux support is only present on newer devices: used Chromebooks without Crostini support will have no ability to use this method. (Android App support is irrelevant.)
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| *This will add considerable weight to the Linux partition, which is a minimal Debian/Gnome installation. You will need at least 6GB free for libraries to support Wine such as missing X11 and Gnome components, not counting the actual Homecoming Launcher installation. A minimum Linux partition size of 20GB is recommended.
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| *The Linux partition is using emulation to run under ChromeOS which is a Virtual Machine. This will mean a considerable performance hit in game play. For a Chromebook with low system specs, this will result in instability or a corrupted Linux partition/loss of data.
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| ==== Dual Booting Linux on a Chromebook ==== | | == Paid Support == |
| {{historical|type=section|customreason=that no longer applies: You cannot install or dual-boot Linux on currently sold devices to be able to run}}
| | === Codeweavers === |
| | | The main sponsor of the Wine Project, [https://www.codeweavers.com/crossover/#linux Codeweavers], maintains a paid license of Crossover as a Prosumer Wine distribution offering tech support for use. It is important to note two things: |
| Chromebooks can also be reformatted using a third-party firmware such as MrChromebox and either dual-booting a Linux installation, or replacing Chrome OS. Either method, Wine performance would be close to native execution. Once dual-booted or running Linux alone, the installation of City of Heroes above will suffice to install the game.
| | #''Paying for Crossover is not required to play Homecoming if you can install Wine on your own'', however, it will work if you require paid Tech Support assistance instead of a Community-led forum. |
| | | #Crossover's main customer base is business-class users. (They will support gaming, but a lot of what Cedega did in the past to simplify gaming use is not built into the application.) |
| As advised by firmware providers, using a lightweight distribution of Linux for lower-spec Chromebooks is a good idea: look for a distribution using LXDE, XFCE, or Openbox as a desktop over a full experience like Ubuntu, Debian, or Fedora. GalliumOS works the best with a high-percentage of compatibility with Chromebook hardware. Options such as Lubuntu, Trisquel Mini, Puppy Linux and BunsenLabs are also possible with a little work on drivers and minor fixes on your part.
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| However, this isn't a recommended method going forward: Chromebooks released after 2018 no longer permit a dual-boot or ChromeOS replacement scenario with Intel/AMD processor support.<ref>[https://mrchromebox.tech/#faq The MrChromebox website] advises not to use Chromebooks as a low-cost Linux device. Starting with Intel Apollo Lake models (from 2016) and AMD Zen Chromebooks, firmware support is minimal and quirks vary by model.</ref> Users seeking hardware to play Homecoming: City of Heroes for under $400 are better served with Windows laptops at that price range.
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| === Steam Deck (Simplified Instructions) ===
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| To play Homecoming: City of Heroes on a Steam Deck, you can take the following steps instead. Use of Flatpak is recommended to ensure that your Homecoming installation survives updates from SteamOS Holo, which overwrites any packages installed by Pacman such as Wine.
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| (This list is assuming a user does not want to use a Terminal to enter commands in BASH, nor edit configuration files for the setup.)
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| # On the Steam Deck, press the STEAM button, Power, then "Exit to Desktop." You may need to enter your PIN.
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| # At the Desktop, click on Discover app. Use the search box to find Lutris. Install it.
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| # In Lutris, press + in the top left to add a Game. Choose "Search the Lutris website for installers". | |
| # Type in the Search Box "City of Heroes". Choose the entry dated 2004.
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| # You'll see four results: Homecoming 32-Bit, Homecoming 64-bit (both use Tequila), Homecoming Launcher, and another launcher not supported by Homecoming (Sweet Tea). Use of the Homecoming Launcher is advised. Click Install next to it.
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| # Wait until the Homecoming Launcher reaches the install wizard after Wine is set up. When asked for an Install directory, click OK to accept the default. ("Z:\Games\Homecoming")
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| # When completed, City of Heroes will appear in your Lutris launcher screen. To add it to the Steam Deck Gaming Mode App Menu, right click and choose "Create Steam Shortcut".
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| # You can close Lutris and head back to the Gaming Mode launcher. Enter your PIN to return to the Home Screen if it is set.
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| # OPTIONAL: At this time, picking the Bluetooth peripherals you wish to use is a good idea. (While technically you can use the On-Screen Keyboard and Controller Configuration to play, it is far easier to use a separate Bluetooth Keyboard and Mouse instead.) To add Bluetooth accessories, press STEAM and select Bluetooth. Make sure Bluetooth is turned on. (Steam Decks in Gaming Mode have it off by default to conserve battery.)
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| # Press the STEAM button, choose Library. Navigate to "Non-Steam" in the top row, find City of Heroes and press the Options button (next to Y, looks like a Hamburger Menu icon). Select "Add to Favorites" to list the game in the Home Screen along other titles. | |
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| You should now see City of Heroes on the home screen launcher when ready to play. The Start button loads the Homecoming Launcher, which now resembles the Windows Install instructions. Closing HC Launcher returns to the Home Screen.
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| Changes to the HC Launcher startup should be done on Desktop Mode by the Lutris Launcher. (Right click "City of Heroes", choose "Configure...") Changing Properties for City of Heroes in the Gaming Mode launcher may prevent your game from starting, although you can rename the title here if you wish ("Homecoming" works if you use other servers and want to keep launcher shortcuts separate.) This does not write-back to Lutris, it'll still remain "City of Heroes" there.
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| ADVANCED: You may wish to use GE-Proton (GloriousEggroll Proton) with your installation, which can be done by installing "ProtonUp-Qt" in the Discover app.
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| # Run ProtonUp-Qt in the Gaming menu, then click "Add Version" to find a GE-Proton release. (The numbering matches the major releases of Wine: GE-Proton 8.12 is Wine 8 equivalent, for example.) Click OK and let the app download the library.
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| # Once installed, return to Lutris, right click "City of Heroes", choose "Configure" then click "Runner Options". Change the Wine Version to use GE-Proton instead and Save.
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| # Restart the Steam Deck.
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| == How It Works == | | == How It Works == |
| | {{hidden|Click to Read|bg1=brown| |
| Programs that run on Windows do not directly access the hardware in the machine. For example, if a program needs a file from the hard drive, it does not talk directly to the hard drive, but it calls a function in the kernel, which in turn talks directly to the hard drive. | | Programs that run on Windows do not directly access the hardware in the machine. For example, if a program needs a file from the hard drive, it does not talk directly to the hard drive, but it calls a function in the kernel, which in turn talks directly to the hard drive. |
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| City of Heroes in particular already uses OpenGL for its 3D graphics (while using DirectX primarily for input), which gives it a performance advantage when running through WINE. | | City of Heroes in particular already uses OpenGL for its 3D graphics (while using DirectX primarily for input), which gives it a performance advantage when running through WINE. |
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| {{hidden|Primer - Linux Features and Gaming Standards|bg1=brown|
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| ;WINE - Wine is Not an Emulator. | | ;WINE - Wine is Not an Emulator. |
| :The app compatibility layer that can be optionally installed on *nix systems (Linux, including Debian, Fedora, and FreeBSD variants, Android and MacOS under the Darwin project) to allow x32/x64 Windows apps to run at close-to-native execution. Wine includes libraries, system files, and enough of a Windows filesystem to fool most Windows apps into thinking they're running on Windows itself. | | :The app compatibility layer that can be optionally installed on *nix systems (Linux, including Debian, Fedora, and FreeBSD variants, Android and MacOS under the Darwin project) to allow x32/x64 Windows apps to run at close-to-native execution. Wine includes libraries, system files, and enough of a Windows filesystem to fool most Windows apps into thinking they're running on Windows itself. |
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| | ;Wine Prefix - Basic unit of Wine access. |
| | :A Wine Prefix is a miniature file system of Windows. The default one on your system is /home/YourUsernameHere/.wine and is made automatically the first time you run a Windows app or use Wine. (The . in front of Wine means it is a hidden directory. You can turn on "Show Hidden Files" in your file manager to see it.) Inside the .wine folder is a similar directory structure to a Windows Hard Drive, with a Windows folder and essential DLLs inside, all the folders in Windows such as System32, Fonts, and other system resources, and a Program Files folder for installed apps that require one. You can made additional Wine Prefixes, assuring your programs are isolated from each other (if an app fails in one prefix, the others are unfazed.) |
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| ;OpenGL & Vulkan - Graphics Libraries. | | ;OpenGL & Vulkan - Graphics Libraries. |
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| :A kernel module is a compiled piece of software that "hooks" between the Linux kernel itself and the hardware system calls. Kernel Modules can be compiled when a system updates a hardware driver OR Linux Kernel. This causes the Kernel Module to recompile to handle the new instructions on either side. The focus on Free Software and Open Source code means that when a problem is found with hardware the community has the ability to handle it on their own; when proprietary drivers are used issues with Linux are 100% up to the hardware manufacturer to solve. Proprietary driver improvements have had middling to low results for Linux users historically. (Intel and AMD have had a far better track record of open sourcing their firmware code; NVidia since 2012 is improving gradually.) | | :A kernel module is a compiled piece of software that "hooks" between the Linux kernel itself and the hardware system calls. Kernel Modules can be compiled when a system updates a hardware driver OR Linux Kernel. This causes the Kernel Module to recompile to handle the new instructions on either side. The focus on Free Software and Open Source code means that when a problem is found with hardware the community has the ability to handle it on their own; when proprietary drivers are used issues with Linux are 100% up to the hardware manufacturer to solve. Proprietary driver improvements have had middling to low results for Linux users historically. (Intel and AMD have had a far better track record of open sourcing their firmware code; NVidia since 2012 is improving gradually.) |
| }} | | }} |
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| == Paid Support ==
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| === Codeweavers ===
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| The main sponsor of the Wine Project, [https://www.codeweavers.com/crossover/#linux Codeweavers], maintains a paid license of Crossover as a Prosumer Wine distribution offering tech support for use. It is important to note two things:
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| #''Paying for Crossover is not required to play Homecoming if you can install Wine on your own'', however, it will work if you require paid Tech Support assistance instead of a Community-led forum.
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| #Crossover's main customer base is business-class users. (They will support gaming, but a lot of what Cedega did in the past to simplify gaming use is not built into the application.)
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| == External Links == | | == External Links == |
| * [https://forums.homecomingservers.com/topic/23284-homecoming-launcher-linux-advice/ Linux Advice] - Using Homecoming Launcher in Linux. | | * [https://forums.homecomingservers.com/topic/23284-homecoming-launcher-linux-advice/ Linux Advice] - Written in 2020, most distributions listed here are outdated. Also, Lutris is not necessary to run the title at all. |
| * [http://appdb.winehq.org/objectManager.php?sClass=version&iId=2980 City of Heroes/City of Villains] entry in the WINE application database. | | * [http://appdb.winehq.org/objectManager.php?sClass=version&iId=2980 City of Heroes/City of Villains] entry in the WINE application database. |
| * [http://winehq.com/ WINE], the underlying technology that allows Windows programs to run on Linux | | * [http://winehq.com/ WINE], the underlying technology that allows Windows programs to run on Linux |
- See also: City of Heroes on Mac and City of Heroes on Steam Deck
Editor's Note:
Homecoming Developers do not support any client bugs on Linux. If an issue cannot be reproduced in a Windows client, Linux specific bugs will be given a form response and closed without resolution. Please use the Homecoming Forums for Linux client support from other users.
Overview
It is possible to run City of Heroes on Linux through a technology called WINE (WINE Is Not an Emulator). By porting the Windows API libraries that City of Heroes uses to Linux, WINE effectively "fools" City of Heroes into thinking that it is actually running on Windows.
Instructions (Homecoming Launcher)
If you can only see Desktop, Images, Documents and similar folders in your home folder, make sure "Show hidden files" is checked in your File Manager first. ".wine" should appear normally.
NVidia users: higher numbers will support newer features, lower and older numbers are more stable if the higher numbered ones have problems. Don't use server drivers or "Nouveau", they won't allow City of Heroes to launch.
For sake of brevity, we'll assume you have a working Linux installation that is fully patched. The distro does not matter. Also assuming a 64-bit system and you can replace "usernameGoesHere" below with your Linux username where needed.
Using a Steam Deck? An install script is available on City of Heroes on Steam Deck.
- Install Wine Stable using this download page -- https://wiki.winehq.org/Download
- Once installed the default Wine Prefix (/home/usernameGoesHere/.wine) will be made. It will prompt to install Gecko and Mono. Note that NEITHER library is necessary to run Homecoming: City of Heroes (although Mono will be useful if you wish to use Mids Reborn or other .NET apps later.) Another note worthy of mention -- it is not prompted during setup but you do NOT need to install Visual C++ Runtime at all. Wine handles this requirement automatically.
- Run the Homecoming Installer. Choosing a location on drive C will try to install Homecoming in ~/.wine (eg C:\Games\Homecoming -> ~/.wine/drive_c/Games/Homecoming); Z: is the root Linux drive (so Z:\Games\Homecoming would correspond to /Games/Homecoming; an ordinary user account would not have permission to create this directory).
It is also important to note this procedure is sufficient for a single-user Linux system alone. For a multiuser system, either you need to repeat the procedure for each user (and sufficient disk space is required: 6-12GB per user), or configure permissions to allow multiple users access to the same WinePrefix.
System Requirements
As a generality, if a system would not be able to play City of Heroes using Windows because of the hardware in use there's a good chance Linux won't work either.
- 1 GHz Dual Core processor (AMD/Intel 32 or 64 bit),
- 2GB of RAM,
- a video card or integrated graphics support capable of OpenGL 2.0/3.0,
- 6-12GB free hard drive space.
Most systems made since 2018 should more than meet these requirements. The biggest factor is video support; in most cases performance will be either equivalent to, or have a slight performance increase (around 10%-20%) over Windows due to less overhead processes present in the OS. This varies due to the distribution used, graphics driver installed, and power consumption setting (such as a laptop on a battery, or any 'Eco mode' settings used.)
Support Lifeline
Linux has one key difference over Windows for support: When NVidia, AMD, or Intel drop Linux driver support for a video card and the kernel fails to compile with the legacy driver in-place, you can no longer play City of Heroes on that system. There is no specific date when this support ends; it will not be announced publicly when a software upgrade fails. The day that the video driver fails to recompile kernel modules for your current OS is when you need to decide. Possible fixes include:
- Run COH on an older OS (that still receives updates) so older drivers continue to compile normally,
- Upgrade your hardware, or
- Set up your system to dual-boot (or wipe and restore) Windows to continue play.
Unsupported Linux Hardware
The following Linux systems will not have the resources to play City of Heroes.
ARM Linux
Homecoming Launcher (and more importantly the City of Heroes client) is not compiled for ARM. Wine will not run HCLauncher on an ARM system without a Software Emulator for X86 apps. Single-Board Computers (Raspberry Pi and variants) will not run City of Heroes with Wine alone.
Chromebooks
As any Chromebook with an ARM chip is a non starter (see "ARM Linux" above this section), Chromebooks generally cannot run City of Heroes. The few exceptions out there either are discontinued models no longer supported, or cost more than a Windows Laptop which can run it far easier.
Paid Support
Codeweavers
The main sponsor of the Wine Project, Codeweavers, maintains a paid license of Crossover as a Prosumer Wine distribution offering tech support for use. It is important to note two things:
- Paying for Crossover is not required to play Homecoming if you can install Wine on your own, however, it will work if you require paid Tech Support assistance instead of a Community-led forum.
- Crossover's main customer base is business-class users. (They will support gaming, but a lot of what Cedega did in the past to simplify gaming use is not built into the application.)
How It Works
Click to Read
Programs that run on Windows do not directly access the hardware in the machine. For example, if a program needs a file from the hard drive, it does not talk directly to the hard drive, but it calls a function in the kernel, which in turn talks directly to the hard drive.
The primary advantage of this type of abstraction is that programs do not have to worry about the hardware-specific details of every device that is installed. Before this level of abstraction was achieved, every program had to have special drivers for every device that might be used. Now, only one set of drivers must be installed on Windows, which can be shared through a common set of functions that Windows provides (called the Application Programming Interface, or API).
A special set of functions may be grouped into a programming library. Such libraries typically handle some specific functionality. For example, there are two primary graphics libraries in use today to program games: Microsoft's DirectX, and OpenGL, an industry-standard graphics library. Since DirectX is a proprietary software library, programs that use it will typically only run on Windows. Since OpenGL has Windows and Linux versions, however, programs that run using this library are much more easily converted between Windows and Linux.
The open source community developed an application called WINE that provides a layer of abstraction between Windows programs and the system they're running on by taking the place of the Windows kernel and API. Among other things, it implements much of the DirectX library (converting the 3D parts to OpenGL). When WINE is installed on Linux, programs that use DirectX may be able to run, because they believe they are calling DirectX functions, and those functions work similarly under Linux and Windows.
City of Heroes in particular already uses OpenGL for its 3D graphics (while using DirectX primarily for input), which gives it a performance advantage when running through WINE.
- WINE - Wine is Not an Emulator.
- The app compatibility layer that can be optionally installed on *nix systems (Linux, including Debian, Fedora, and FreeBSD variants, Android and MacOS under the Darwin project) to allow x32/x64 Windows apps to run at close-to-native execution. Wine includes libraries, system files, and enough of a Windows filesystem to fool most Windows apps into thinking they're running on Windows itself.
- Wine Prefix - Basic unit of Wine access.
- A Wine Prefix is a miniature file system of Windows. The default one on your system is /home/YourUsernameHere/.wine and is made automatically the first time you run a Windows app or use Wine. (The . in front of Wine means it is a hidden directory. You can turn on "Show Hidden Files" in your file manager to see it.) Inside the .wine folder is a similar directory structure to a Windows Hard Drive, with a Windows folder and essential DLLs inside, all the folders in Windows such as System32, Fonts, and other system resources, and a Program Files folder for installed apps that require one. You can made additional Wine Prefixes, assuring your programs are isolated from each other (if an app fails in one prefix, the others are unfazed.)
- OpenGL & Vulkan - Graphics Libraries.
- OpenGL was originally created by Silicon Graphics Inc. as an open source graphics library for game and 3D programming use. Later adopted by the Khronos Group OpenGL is a legacy standard on most graphics cards succeeded by the backwards-compatible Vulkan standard. City of Heroes uses OpenGL 2.0 and 3.0 features in the game engine.
- DirectX - Microsoft's Gaming Support Library.
- DirectX since the 2000's has been Microsoft's attempt to unify multimedia features of Windows with performance expectations for PC Gaming. While most games are shedding older versions of DirectX support, City of Heroes remains a DirectX 8 compatible title that is modified to work on newer versions. DirectX also includes Direct Input (an older gaming accessory signaling standard) and Direct3D (Microsoft's approach at OpenGL.)
- DXVK - Linux Direct X to Vulkan Translation Layer
- As graphics cards de-emphasize performance in legacy areas for more current standards Vulkan will receive more improvements over time over OpenGL. DXVK allows a modern graphics card to take current Vulkan support already in place to use on older OpenGL calls for a slight performance increase. (Lutris is a GUI Game Launcher that handles DXVK installation in the same package for you along with other optimizations as well.)
- FUSE - Filesystem in USErspace
- FUSE is Linux's approach at a secure file system for users to save configuration files, run local applications specific to each user, and store data secure from other users on the same system. A user's home folder in FUSE has the same shortcut: ~ (tilde), which can be used on a relative path similar to Windows %APPDATA% shortcut: "~/.wine/drive_c/" will always send you directly to your default WinePrefix's drive_c folder. When you have a WinePrefix installed it resides in userspace on your home folder. The apps you install and play are only available to you initially (without editing permissions or ownership) and other users will need to install their own WinePrefix as well. This separation prevents one user's Wine apps from affecting another and adds modularity. (Multiple WinePrefixes can exist per user, such as a work one vs. a home one, separate ones per game, etc.)
- FUSE is preferable over another location such as /usr, /var, or /etc as it simplifies file changes, allows Windows file permissions to exist and ignore Linux attributes, and is safer to other users on the same system from a security standpoint.
- Mesa - Freedesktop open source graphic drivers that are vendor-neutral.
- Mesa graphic drivers are used as the core of most Linux distributions as they come with the installation regardless of what card you use. Certain cards such as Intel only use Mesa in their core setup and require no other proprietary drivers to work. Others use Mesa as a fallback or safety option when the main driver fails.
- Nouveau - Freedesktop approach at a 100% open source NVidia video driver.
- Nouveau was started in the 2000s as a response to NVidia's open source ambitions at the time (none would be fair to say). The effort is trying to make a video driver for NVidia cards without reverse engineering their proprietary drivers so it is compatible with GPL and Free Software standards. The downside to the current approach for gaming is Nouveau is aiming for legacy compatibility over new features. While Nouveau may be useable for gaming purposes someday it is not advisable to play City of Heroes using Nouveau at this time. (Users who have strong opinions on Free Software standards that prevent them from accepting the use of proprietary drivers on a Linux system may have an easier time seeking Intel, AMD and Radeon hardware over NVidia until this improves.)
- Kernel Modules - Linux's approach at hardware driver support.
- A kernel module is a compiled piece of software that "hooks" between the Linux kernel itself and the hardware system calls. Kernel Modules can be compiled when a system updates a hardware driver OR Linux Kernel. This causes the Kernel Module to recompile to handle the new instructions on either side. The focus on Free Software and Open Source code means that when a problem is found with hardware the community has the ability to handle it on their own; when proprietary drivers are used issues with Linux are 100% up to the hardware manufacturer to solve. Proprietary driver improvements have had middling to low results for Linux users historically. (Intel and AMD have had a far better track record of open sourcing their firmware code; NVidia since 2012 is improving gradually.)
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