feat(viewport): add aa

src/gui/main.cpp

@@ -10,6 +10,7 @@ int main(int argc, char **argv)
     format.setRenderableType(QSurfaceFormat::OpenGL);
     format.setVersion(3, 2);
     format.setProfile(QSurfaceFormat::CoreProfile);
+    format.setSamples(4);
     QSurfaceFormat::setDefaultFormat(format);
 
     QApplication app (argc, argv);

src/gui/viewport/ViewportGLWidget.cpp

@@ -14,6 +14,7 @@ void ViewportGLWidget::initializeGL()
     glEnable(GL_DEPTH_TEST);
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable(GL_MULTISAMPLE);
 
     triangleMesh_ = std::make_unique<GLMesh>();
     gridMesh_ = std::make_unique<GLGrid>();