Configurable anti-aliasing for MinimalScene (#723) (#727)

(cherry picked from commit a71c5e6)

Signed-off-by: Maksim Derbasov <ntfs.hard@gmail.com>
Co-authored-by: Maksim Derbasov <ntfs.hard@gmail.com>

Author: mergify[bot]

src/plugins/minimal_scene/MinimalScene.cc

@@ -775,7 +775,7 @@ std::string GzRenderer::Initialize(RenderThreadRhi &_rhi)
   this->dataPtr->camera->SetImageHeight(this->textureSize.height());
   this->dataPtr->camera->SetImageFormat(this->dataPtr->camera->ImageFormat(),
                                         true);
-  this->dataPtr->camera->SetAntiAliasing(8);
+  this->dataPtr->camera->SetAntiAliasing(this->cameraAntiAliasing);
   this->dataPtr->camera->SetHFOV(this->cameraHFOV);
   // setting the size and calling PreRender should cause the render texture to
   // be rebuilt
@@ -1346,6 +1346,12 @@ void RenderWindowItem::SetCameraFarClip(double _far)
   this->dataPtr->renderThread->gzRenderer.cameraFarClip = _far;
 }
 
+/////////////////////////////////////////////////
+void RenderWindowItem::SetAntiAliasing(unsigned int _aa)
+{
+  this->dataPtr->renderThread->gzRenderer.cameraAntiAliasing = _aa;
+}
+
 /////////////////////////////////////////////////
 void RenderWindowItem::SetSkyEnabled(const bool &_sky)
 {
@@ -1486,6 +1492,24 @@ void MinimalScene::LoadConfig(const tinyxml2::XMLElement *_pluginElem)
       }
     }
 
+    elem = _pluginElem->FirstChildElement("anti_aliasing");
+    if (nullptr != elem && nullptr != elem->GetText())
+    {
+      unsigned int aa{};
+      std::stringstream aaStr(std::string(elem->GetText()));
+      aaStr >> aa;
+      if (aaStr.fail())
+      {
+        gzerr << "Unable to set anti-aliasing <anti_aliasing> to '"
+              << elem->GetText()
+              << "' using default value" << std::endl;
+      }
+      else
+      {
+        renderWindow->SetAntiAliasing(aa);
+      }
+    }
+
     elem = _pluginElem->FirstChildElement("sky");
     if (nullptr != elem && nullptr != elem->GetText())
     {

src/plugins/minimal_scene/MinimalScene.hh

@@ -62,6 +62,7 @@ namespace gz::gui::plugins
   /// * \<sky\> : If present, sky is enabled.
   /// * \<horizontal_fov\> : Horizontal FOV of the user camera in degrees,
   ///                        defaults to 90
+  /// * \<anti_aliasing> : Optional level of anti-aliasing, default is 8
   /// * \<graphics_api\> : Optional graphics API name. Valid choices are:
   ///                      'opengl', 'metal'. Defaults to 'opengl'.
   /// * \<view_controller> : Set the view controller (InteractiveViewControl
@@ -220,6 +221,9 @@ namespace gz::gui::plugins
     /// \brief Default camera far clipping plane distance
     public: double cameraFarClip = 1000.0;
 
+    /// \brief Default camera anit-aliasing level
+    public: unsigned int cameraAntiAliasing = 8;
+
     /// \brief Scene background color
     public: math::Color backgroundColor = math::Color::Black;
 
@@ -353,6 +357,10 @@ namespace gz::gui::plugins
     /// \param[in] _far Far clipping plane distance
     public: void SetCameraFarClip(double _far);
 
+    /// \brief Set the render window camera's anti-aliasing level
+    /// \param[in] _aa Anti-aliasing level
+    public: void SetAntiAliasing(unsigned int _aa);
+
     /// \brief Called when the mouse hovers to a new position.
     /// \param[in] _hoverPos 2D coordinates of the hovered mouse position on
     /// the render window.