modified glStereo option to be overrideable similar to other OpenGL

options

common/GlobalOptions.cc

@@ -150,6 +150,7 @@ static bool samplesOverride_ = false;
 
 /// Store the opengl stereo support
 static bool glStereo_ = true;
+static bool overrideGLStereo_ = false;
 
 /// Stereo mode
 static StereoMode stereoMode_ = OpenGL;
@@ -453,13 +454,22 @@ int samples() {
 }
 
 /// Store opengl stereo mode setting
-void glStereo( bool _glStereo ) {
-  glStereo_ = _glStereo;
+void glStereo( bool _glStereo, bool _temporary ) {
+  if(_temporary)
+  {
+    glStereo_ = _glStereo;
+    overrideGLStereo_ = true;
+  }
+  else
+    OpenFlipperSettings().setValue("Core/OpenGL/Stereo",_glStereo);
 }
 
 /// get current opengl stereo setting
 bool glStereo( ) {
-  return glStereo_;
+  if(overrideGLStereo_)
+    return glStereo_;
+  else
+    return OpenFlipperSettings().value("Core/OpenGL/Stereo",false).toBool();
 }
 
 /// Store stereo mode setting

common/GlobalOptions.hh

@@ -456,7 +456,7 @@ QString helpDirStr();
 
   /// Store opengl stereo support setting
   DLLEXPORT
-  void glStereo( bool _stereo );
+  void glStereo( bool _stereo, bool _temporary = false );
 
   /// will be set in core is opengl stereo is supported
   DLLEXPORT