eglfs: Fix crash when painting the mouse cursor in a multiscreen setup

Always make sure to initialize the OpenGL functions. Instead of relying
on the shaderprogram initialization, which is bound to the current
context, check for the d_ptr and initialize when not already done.

With this fix QEglFSCursor::draw works regardless of which context is
current and checking for that is not needed anymore in paintOnScreen.
This is important as the basic render loop only uses one context for
painting on all screens, while the threaded render loop uses multiple
contexts.

Pick-to: 6.4 6.3 6.2 5.15
Change-Id: I4ac2f5184c2fce27421e92efe1b7f635c71c0e92
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 5 insertions, 5 deletions

diff --git a/src/plugins/platforms/eglfs/api/qeglfscursor.cpp b/src/plugins/platforms/eglfs/api/qeglfscursor.cpp
index 05a86cee64..dadde5905e 100644
--- a/src/plugins/platforms/eglfs/api/qeglfscursor.cpp
+++ b/src/plugins/platforms/eglfs/api/qeglfscursor.cpp
@@ -309,8 +309,7 @@ void QEglFSCursor::paintOnScreen()
     // screens are siblings of each other. When not enabled, the sibling list
     // only contains m_screen itself.
     for (QPlatformScreen *screen : m_screen->virtualSiblings()) {
-        if (screen->geometry().contains(cr.topLeft().toPoint() + m_cursor.hotSpot)
-            && QOpenGLContext::currentContext()->screen() == screen->screen())
+        if (screen->geometry().contains(cr.topLeft().toPoint() + m_cursor.hotSpot))
         {
             cr.translate(-screen->geometry().topLeft());
             const QSize screenSize = screen->geometry().size();
@@ -433,11 +432,12 @@ void QEglFSCursor::draw(const QRectF &r)
 {
     StateSaver stateSaver;
 
-    QEglFSCursorData &gfx = static_cast<QEglFSContext*>(QOpenGLContext::currentContext()->handle())->cursorData;
-    if (!gfx.program) {
-        // one time initialization
+    // one time initialization
+    if (!QOpenGLFunctions::d_ptr)
         initializeOpenGLFunctions();
 
+    QEglFSCursorData &gfx = static_cast<QEglFSContext*>(QOpenGLContext::currentContext()->handle())->cursorData;
+    if (!gfx.program) {
         createShaderPrograms();
 
         if (!gfx.atlasTexture) {