From 7a874bdbdd2e29b0b44665f684b94a08bfd61e5e Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Tue, 10 Dec 2019 15:03:46 +0100
Subject: [PATCH] Mesh: In ViewProviderMesh::getVisibleFacets replace
 SoFCOffscreenRenderer with SoQtOffscreenRenderer to due issues with Indirect
 GLX on recent Linux systems [skip ci]

---
 src/Mod/Mesh/Gui/ViewProvider.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Mesh/Gui/ViewProvider.cpp b/src/Mod/Mesh/Gui/ViewProvider.cpp
index 935e815039..de2506627f 100644
--- a/src/Mod/Mesh/Gui/ViewProvider.cpp
+++ b/src/Mod/Mesh/Gui/ViewProvider.cpp
@@ -1364,7 +1364,7 @@ private:
 std::vector<unsigned long> ViewProviderMesh::getVisibleFacets(const SbViewportRegion& vp,
                                                               SoCamera* camera) const
 {
-#if 1
+#if 0
     Q_UNUSED(vp)
 
     SbVec3f pos = camera->position.getValue();
@@ -1437,8 +1437,14 @@ std::vector<unsigned long> ViewProviderMesh::getVisibleFacets(const SbViewportRe
     root->addChild(this->getCoordNode());
     root->addChild(this->getShapeNode());
 
+    // Coin3d's off-screen renderer doesn't work out-of-the-box any more on most recent Linux systems.
+    // So, use FreeCAD's offscreen renderer now.
+#if 0
     Gui::SoFCOffscreenRenderer& renderer = Gui::SoFCOffscreenRenderer::instance();
     renderer.setViewportRegion(vp);
+#else
+    Gui::SoQtOffscreenRenderer renderer(vp);
+#endif
     renderer.setBackgroundColor(SbColor(0.0f, 0.0f, 0.0f));
 
     QImage img;