From b7bd7d229b1f960afe2bec95837176b66471e56f Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Thu, 17 Dec 2020 16:27:36 +0100
Subject: [PATCH] Gui: [skip ci] add option to use software OpenGL

---
 src/Gui/Application.cpp          |  9 +++++++++
 src/Gui/DlgSettings3DView.ui     | 18 ++++++++++++++++++
 src/Gui/DlgSettings3DViewImp.cpp |  2 ++
 3 files changed, 29 insertions(+)

diff --git a/src/Gui/Application.cpp b/src/Gui/Application.cpp
index 0f24076cb5..ea4c6a76d9 100644
--- a/src/Gui/Application.cpp
+++ b/src/Gui/Application.cpp
@@ -1923,6 +1923,15 @@ void Application::runApplication(void)
     QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 #endif
 
+    // Use software rendering for OpenGL
+#if QT_VERSION >= 0x050400
+    ParameterGrp::handle hOpenGL = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/OpenGL");
+    bool useSoftwareOpenGL = hOpenGL->GetBool("UseSoftwareOpenGL", false);
+    if (useSoftwareOpenGL) {
+        QApplication::setAttribute(Qt::AA_UseSoftwareOpenGL);
+    }
+#endif // QT_VERSION >= 0x050400
+
     // A new QApplication
     Base::Console().Log("Init: Creating Gui::Application and QApplication\n");
 
diff --git a/src/Gui/DlgSettings3DView.ui b/src/Gui/DlgSettings3DView.ui
index 65cc2d9fe6..9df215caba 100644
--- a/src/Gui/DlgSettings3DView.ui
+++ b/src/Gui/DlgSettings3DView.ui
@@ -108,6 +108,24 @@ will be shown at the lower left corner in opened files</string>
       <string>Rendering</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout_3">
+      <item>
+       <widget class="Gui::PrefCheckBox" name="CheckBox_use_SW_OpenGL">
+        <property name="toolTip">
+         <string>This option is useful for troubleshooting graphics card and driver problems.
+
+Changing this option requires a restart of the application.</string>
+        </property>
+        <property name="text">
+         <string>Use software OpenGL</string>
+        </property>
+        <property name="prefEntry" stdset="0">
+         <cstring>UseSoftwareOpenGL</cstring>
+        </property>
+        <property name="prefPath" stdset="0">
+         <cstring>OpenGL</cstring>
+        </property>
+       </widget>
+      </item>
       <item>
        <widget class="Gui::PrefCheckBox" name="CheckBox_useVBO">
         <property name="toolTip">
diff --git a/src/Gui/DlgSettings3DViewImp.cpp b/src/Gui/DlgSettings3DViewImp.cpp
index 134aae1336..b1fe1d71aa 100644
--- a/src/Gui/DlgSettings3DViewImp.cpp
+++ b/src/Gui/DlgSettings3DViewImp.cpp
@@ -93,6 +93,7 @@ void DlgSettings3DViewImp::saveSettings()
     ui->CheckBox_WbByTab->onSave();
     ui->CheckBox_ShowFPS->onSave();
     ui->spinPickRadius->onSave();
+    ui->CheckBox_use_SW_OpenGL->onSave();
     ui->CheckBox_useVBO->onSave();
     ui->FloatSpinBox_EyeDistance->onSave();
     ui->checkBoxBacklight->onSave();
@@ -109,6 +110,7 @@ void DlgSettings3DViewImp::loadSettings()
     ui->CheckBox_WbByTab->onRestore();
     ui->CheckBox_ShowFPS->onRestore();
     ui->spinPickRadius->onRestore();
+    ui->CheckBox_use_SW_OpenGL->onRestore();
     ui->CheckBox_useVBO->onRestore();
     ui->FloatSpinBox_EyeDistance->onRestore();
     ui->checkBoxBacklight->onRestore();