From ffe8b9083f11be627dbfabaf5034d1976d03551a Mon Sep 17 00:00:00 2001
From: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
Date: Mon, 9 Mar 2020 21:23:37 -0300
Subject: [PATCH 14/20] UI: Retrieve Wayland surface from QWindow

On Wayland, we want to query the window's underlying
platform for the Wayland surface, instead of foolishly
retrieving the X11 display.

Pass QWindow instead of WId directly, and set the surface
as the platform data on Wayland systems.
---
 UI/qt-display.cpp  |  2 +-
 UI/qt-wrappers.cpp | 28 +++++++++++++++++++++++-----
 UI/qt-wrappers.hpp |  3 ++-
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/UI/qt-display.cpp b/UI/qt-display.cpp
index 1bb97c7b..685ee6f9 100644
--- a/UI/qt-display.cpp
+++ b/UI/qt-display.cpp
@@ -89,7 +89,7 @@ void OBSQTDisplay::CreateDisplay()
 	info.format = GS_BGRA;
 	info.zsformat = GS_ZS_NONE;
 
-	QTToGSWindow(winId(), info.window);
+	QTToGSWindow(windowHandle(), info.window);
 
 	display = obs_display_create(&info, backgroundColor);
 
diff --git a/UI/qt-wrappers.cpp b/UI/qt-wrappers.cpp
index e8a51d37..1485a181 100644
--- a/UI/qt-wrappers.cpp
+++ b/UI/qt-wrappers.cpp
@@ -27,9 +27,14 @@
 #include <QKeyEvent>
 
 #if !defined(_WIN32) && !defined(__APPLE__)
+#include <obs-nix-platform.h>
 #include <QX11Info>
 #endif
 
+#ifdef ENABLE_WAYLAND
+#include <qpa/qplatformnativeinterface.h>
+#endif
+
 static inline void OBSErrorBoxva(QWidget *parent, const char *msg, va_list args)
 {
 	char full_message[4096];
@@ -105,15 +110,28 @@ void OBSMessageBox::critical(QWidget *parent, const QString &title,
 	mb.exec();
 }
 
-void QTToGSWindow(WId windowId, gs_window &gswindow)
+void QTToGSWindow(QWindow *window, gs_window &gswindow)
 {
 #ifdef _WIN32
-	gswindow.hwnd = (HWND)windowId;
+	gswindow.hwnd = (HWND)window->winId();
 #elif __APPLE__
-	gswindow.view = (id)windowId;
+	gswindow.view = (id)window->winId();
 #else
-	gswindow.id = windowId;
-	gswindow.display = QX11Info::display();
+	switch (obs_get_nix_platform()) {
+	case OBS_NIX_PLATFORM_X11_GLX:
+	case OBS_NIX_PLATFORM_X11_EGL:
+		gswindow.id = window->winId();
+		gswindow.display = obs_get_nix_platform_display();
+		break;
+#ifdef ENABLE_WAYLAND
+	case OBS_NIX_PLATFORM_WAYLAND:
+		QPlatformNativeInterface *native =
+			QGuiApplication::platformNativeInterface();
+		gswindow.display =
+			native->nativeResourceForWindow("surface", window);
+		break;
+#endif
+	}
 #endif
 }
 
diff --git a/UI/qt-wrappers.hpp b/UI/qt-wrappers.hpp
index 69996deb..f191f8f9 100644
--- a/UI/qt-wrappers.hpp
+++ b/UI/qt-wrappers.hpp
@@ -20,6 +20,7 @@
 #include <QApplication>
 #include <QMessageBox>
 #include <QWidget>
+#include <QWindow>
 #include <QThread>
 #include <obs.hpp>
 
@@ -55,7 +56,7 @@ public:
 
 void OBSErrorBox(QWidget *parent, const char *msg, ...);
 
-void QTToGSWindow(WId windowId, gs_window &gswindow);
+void QTToGSWindow(QWindow *window, gs_window &gswindow);
 
 uint32_t TranslateQtKeyboardEventModifiers(Qt::KeyboardModifiers mods);
 
-- 
2.28.0