• Old School RuneScape ¹⁾
• Java; see New C++ Client notes for the modern GPU-accelerated client

• Fedora Workstation

• 2023/06/19: There are no known configurations where -Dsun.java2d.opengl=true offers a performance benefit
• 2020/03/24: On macOS, using the official .dmg to install OSRS resulted in the worst possible performance due to a mix of forced GPU acceleration and Retina with Java 8; it was recommended to manually install OSRS and to use the latest OpenJDK package available instead to workaround this
• -Dsun.java2d.uiScale at 2 and higher increases all UI scale in-game, and improves performance with lowering texture resolution

• jagexappletviewer.jar from OldSchool.msi was used because it allows the copyright footer bar to be removed upon logging in ^{2) 3)}
• The copyright footer was not hidden with OpenJDK 12, 13, and presumably any JRE newer than 11 if jagexappletviewer.jar comes from OldSchool.msi ⁴⁾

• wmctrl is used to toggle between windowed and fullscreen states
• p7zip-plugins is needed to extract jagexappletviewer.jar from OldSchool.msi later ^{5) 6)}
• As of 2023/03/17, Java 19 didn't work on Fedora 37, but 11 is still fine

sudo dnf install java-11-openjdk wmctrl && sync

sudo apt install openjdk-11-jre wmctrl && sync

• Useful for specifying Java 11 in the launch script below instead of changing it system-wide

sudo update-alternatives --config 'java'

rm -Rf ~/'runescape/oldschool' '/tmp/oldschool' && mkdir -p ~/'runescape/oldschool' '/tmp/oldschool' && wget -O '/tmp/oldschool/OldSchool.msi' 'https://www.runescape.com/downloads/oldschool.msi' && 7z e -o'/tmp/oldschool/OldSchool-msi' -y '/tmp/oldschool/OldSchool.msi' && 7z e -o'/tmp/oldschool/rslauncher-cab' -y '/tmp/oldschool/OldSchool-msi/rslauncher.cab' && cp '/tmp/oldschool/rslauncher-cab/JagexAppletViewerJarFile'* ~/'runescape/oldschool/jagexappletviewer.jar' && cp '/tmp/oldschool/rslauncher-cab/JagexAppletViewerPngFile' ~/'runescape/oldschool/jagexappletviewer.png' && rm -Rf '/tmp/oldschool' && sync

• Exec='s Java path may need changed depending on the distro
• Change uiScale if-needed

mkdir -p ~/'.local/share/applications' && nano ~/'.local/share/applications/Old School RuneScape.desktop'

[Desktop Entry]
Name=Old School RuneScape
Comment=Relive the challenging levelling system and risk-it-all PvP of the biggest retro styled MMO. Play with millions of other players in this piece of online gaming heritage where the community controls the development so the game is truly what you want it to be!
Categories=Game;Java;AdventureGame;RolePlaying
Exec='/usr/lib/jvm/java-11-openjdk-amd64/bin/java' -Xms256M -Xmx2G -XX:+UseConcMarkSweepGC -Duser.home='/home/CHANGEME/runescape/oldschool' -Djava.class.path='/home/CHANGEME/runescape/oldschool/jagexappletviewer.jar' -Dcom.jagex.config='http://oldschool.runescape.com/k=3/l=$(Language:0)/jav_config.ws' -Djdk.tls.client.protocols='TLSv1.3' -Dhttps.protocols='TLSv1.3' -Dsun.java2d.opengl='false' -Dsun.java2d.uiScale='1' 'jagexappletviewer' 'oldschool'
Type=Application
StartupNotify=true
Path=/home/CHANGEME/runescape/oldschool
Icon=/home/CHANGEME/runescape/oldschool/OSRS.icns
StartupWMClass=jagexappletviewer
Actions=Screen;Cache;Notes;

[Desktop Action Screen]
StartupNotify=false
Exec='/usr/bin/wmctrl' -r 'jagexappletviewer.jagexappletviewer' -x -b 'toggle,fullscreen'
Name=Toggle Fullscreen/Windowed

[Desktop Action Cache]
StartupNotify=false
Exec='/bin/bash' -c "rm -Rf '/home/CHANGEME/runescape/oldschool/jagexcache' '/home/CHANGEME/runescape/oldschool/jagexappletviewer.preferences' '/home/CHANGEME/runescape/oldschool/jagex_cl_oldschool_LIVE.dat' '/home/CHANGEME/runescape/oldschool/random.dat' '/home/CHANGEME/runescape/oldschool/'*'.log' '/home/CHANGEME/runescape/oldschool/.java' '/tmp/oldschool' && sync && notify-send 'The Old School RuneScape cache has been cleaned.'"
Name=Cache Cleanup

[Desktop Action Notes]
StartupNotify=false
Exec=gio open 'https://wiki.realmofespionage.xyz/games:old_school_runescape'
Name=Installation Notes

sed -i 's/'CHANGEME'/'$USER'/g' ~/'.local/share/applications/Old School RuneScape.desktop'

• The icon provided from the macOS .dmg is higher-res than the one in the Windows .msi
• .icns isn't a valid image file format according to Freedesktop.org Specifications so this isn't in the standard icon folder

rm -Rf '/tmp/oldschool' && mkdir -p '/tmp/oldschool' && wget -O '/tmp/oldschool/OldSchool.dmg' 'https://www.runescape.com/downloads/OldSchool.dmg' && 7z e -o'/tmp/oldschool/OldSchool-dmg' -y '/tmp/oldschool/OldSchool.dmg' && cp '/tmp/oldschool/OldSchool-dmg/OSRS.icns' ~/'runescape/oldschool/OSRS.icns' && rm -Rf '/tmp/oldschool' && sync

rm -Rf ~/'runescape/oldschool/jagexcache' ~/'runescape/oldschool/jagexappletviewer.preferences' ~/'runescape/oldschool/jagex_cl_oldschool_LIVE.dat' ~/'runescape/oldschool/random.dat' '/tmp/oldschool' && sync

cd ~/'runescape/oldschool' && java -Duser.home='.' -Djava.class.path='jagexappletviewer.jar' -Dcom.jagex.config='http://oldschool.runescape.com/jav_config.ws' -Dhttps.protocols='TLSv1.2' -Dsun.java2d.opengl='false' -Dsun.java2d.uiScale='1' 'jagexappletviewer' 'oldschool'

-XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+AlwaysPreTouch -Xms'512M' -Xmx'512M' -XX:-UseBiasedLocking -XX:+DisableExplicitGC

-XX:+UseNUMA

gio open ~/'runescape/oldschool'

• jagexappletviewer.jar has varying filesizes depending on where it's sourced from, along with different functionality depending on the host operating system ⁷⁾

• Extracts jagexappletviewer.jar from OldSchool.msi and requires 7z
• Places it at ~/Downloads/windows-jagexappletviewer.jar

rm -Rf '/tmp/oldschool' && mkdir -p '/tmp/oldschool' && wget -O '/tmp/oldschool/OldSchool.msi' 'https://www.runescape.com/downloads/oldschool.msi' && 7z e -o'/tmp/oldschool/OldSchool-msi' -y '/tmp/oldschool/OldSchool.msi' && 7z e -o'/tmp/oldschool/rslauncher-cab' -y '/tmp/oldschool/OldSchool-msi/rslauncher.cab' && cp '/tmp/oldschool/rslauncher-cab/JagexAppletViewerJarFile'* ~/'Downloads/windows-jagexappletviewer.jar' && rm -Rf '/tmp/oldschool' && sync

• Extracts jagexappletviewer.jar from OldSchool.dmg and requires 7z
• Places it at ~/Downloads/macos-jagexappletviewer.jar

rm -Rf '/tmp/oldschool' && mkdir -p '/tmp/oldschool' && wget -O '/tmp/oldschool/OldSchool.dmg' 'https://www.runescape.com/downloads/OldSchool.dmg' && 7z e -o'/tmp/oldschool/OldSchool-dmg' -y '/tmp/oldschool/OldSchool.dmg' && cp '/tmp/oldschool/OldSchool-dmg/jagexappletviewer.jar' ~/'Downloads/macos-jagexappletviewer.jar' && rm -Rf '/tmp/oldschool' && sync

• TODO

am start -n 'com.jagex.oldscape.android/.AndroidLauncher'

am force-stop 'com.jagex.oldscape.android'

• Alternatively, use Explorer to make the runescape folder in the User folder and runescape\oldschool

if not exist %UserProfile%"\runescape\oldschool" mkdir %UserProfile%"\runescape\oldschool"

start %UserProfile%"\runescape"

• Download the Windows .zip of the latest Java package from https://jdk.java.net/
• Extract the root folder from the archive and drop it in the runescape folder
• Folder structure should be %UserProfile%\runescape\jdk-14
• javaw.exe should exist at %UserProfile%\runescape\jdk-14\bin\javaw.exe

• Extract it from the macOS Oldschool.dmg installer
• Should reside at %UserProfile%\runescape\oldschool\jagexappletviewer.jar

• Should reside at %UserProfile%\runescape\osrs.cmd
• The usual command-line arguments above can be tossed in or altered as-needed

cd "jdk-"*"\bin"

start javaw.exe -Djava.system.class.loader="app.systemclassloader" -Duser.home="..\..\oldschool" -Djava.class.path="..\..\oldschool\jagexappletviewer.jar" -Dcom.jagex.config="http://oldschool.runescape.com/jav_config.ws" -Dhttps.protocols="TLSv1.2" -Xms"768M" -Xmx"768M" -Dsun.java2d.uiScale="1" "jagexappletviewer" "oldschool"

• need macOS dmg .jar
• Need OpenJDK 13 or something in the ~/runescape folder
• OpenJDK 9 had GPU usage and lower FPS
• Need -Djava.system.class.loader=app.systemclassloader
• This very likely needs refactored

rm -Rf ~/'runescape/oldschool' && mkdir -p ~/'runescape/oldschool' && curl 'http://oldschool.runescape.com/downloads/jagexappletviewer.jar' -o ~/'runescape/oldschool/jagexappletviewer.jar' && curl 'https://lh3.googleusercontent.com/WLvp10q8TwtyVgMsYL7gW0c7NVG5vnFcRNS7oQtTnSyWbM9kgo_MS8QZa3bsylNgZDba' -o ~/'runescape/oldschool/jagexappletviewer.png' && sync

#!/usr/bin/env zsh

cd ~/'runescape/oldschool'
~/'runescape/jdk-13.0.1.jdk/Contents/Home/bin/java' -Djava.system.class.loader='app.systemclassloader' -Duser.home='.' -Djava.class.path='jagexappletviewer.jar' -Dcom.jagex.config='http://oldschool.runescape.com/jav_config.ws' -Dhttps.protocols='TLSv1.2' -Xms'768M' -Xmx'768M' -Dsun.java2d.opengl='false' -Dsun.java2d.uiScale='1' 'jagexappletviewer' 'oldschool'