From b3d97da35f74382c8808644b03ac8567b8373d44 Mon Sep 17 00:00:00 2001
From: Joshua Goins <josh@redstrate.com>
Date: Wed, 7 May 2025 22:44:57 -0400
Subject: [PATCH] Add developer option to enable the Wine Wayland backend

The current situation is still (unfortunately...) rough, but it could be
useful to enable in some cases. Once it improves enough we can make
it the default.
---
 launcher/config.kcfg                       |  3 +++
 launcher/src/gamerunner.cpp                |  7 +++++++
 launcher/ui/Settings/DeveloperSettings.qml | 17 +++++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/launcher/config.kcfg b/launcher/config.kcfg
index dec7a86..27bc083 100644
--- a/launcher/config.kcfg
+++ b/launcher/config.kcfg
@@ -54,5 +54,8 @@ SPDX-License-Identifier: CC0-1.0
     <entry name="GithubApi" type="String">
       <default>api.github.com</default>
     </entry>
+    <entry name="EnableWayland" type="bool">
+      <default>false</default>
+    </entry>
   </group>
 </kcfg>
diff --git a/launcher/src/gamerunner.cpp b/launcher/src/gamerunner.cpp
index 8cd5213..8786fa4 100644
--- a/launcher/src/gamerunner.cpp
+++ b/launcher/src/gamerunner.cpp
@@ -13,6 +13,7 @@
 #include "utility.h"
 
 #include <KProcessList>
+#include <QGuiApplication>
 
 using namespace Qt::StringLiterals;
 
@@ -340,6 +341,12 @@ void GameRunner::launchExecutable(const Profile &profile, QProcess *process, con
     const QString logDir = dataDir.absoluteFilePath(QStringLiteral("log"));
 
     env.insert(QStringLiteral("DXVK_LOG_PATH"), logDir);
+
+    // Enable the Wayland backend if we detect we're running on Wayland, otherwise fallback to X11.
+    if (QGuiApplication::platformName() == QStringLiteral("wayland") && m_launcher.config()->enableWayland()) {
+        // We have to unset the DISPLAY variable for Wine to pick it up.
+        env.remove(QStringLiteral("DISPLAY"));
+    }
 #endif
 
 #if defined(Q_OS_MAC) || defined(Q_OS_LINUX)
diff --git a/launcher/ui/Settings/DeveloperSettings.qml b/launcher/ui/Settings/DeveloperSettings.qml
index 095fd8f..86a3cbb 100644
--- a/launcher/ui/Settings/DeveloperSettings.qml
+++ b/launcher/ui/Settings/DeveloperSettings.qml
@@ -85,6 +85,23 @@ FormCard.FormCardPage {
                 LauncherCore.config.save();
             }
         }
+
+        FormCard.FormDelegateSeparator {
+            above: renderDocCaptureDelegate
+            below: enableWaylandDelegate
+        }
+
+        FormCard.FormCheckDelegate {
+            id: enableWaylandDelegate
+
+            text: i18n("Run Game on Wayland")
+            description: i18n("Use the native Wine Wayland driver instead of going through XWayland.")
+            checked: LauncherCore.config.enableWayland
+            onCheckedChanged: {
+                LauncherCore.config.enableWayland = checked;
+                LauncherCore.config.save();
+            }
+        }
     }
 
     FormCard.FormHeader {