From da961490341b86208c0b7ec9e4c8dc37bea1075b Mon Sep 17 00:00:00 2001
From: ptv <ptv@opencascade.com>
Date: Mon, 1 Aug 2005 04:23:52 +0000
Subject: [PATCH] vro changes to enable antiliasing

---
 src/GLViewer/GLViewer_Drawer.cxx | 28 ++++++++++++++++++++++++++++
 src/GLViewer/GLViewer_Drawer.h   |  3 +++
 2 files changed, 31 insertions(+)

diff --git a/src/GLViewer/GLViewer_Drawer.cxx b/src/GLViewer/GLViewer_Drawer.cxx
index 65d0dcf1f..9231804f0 100644
--- a/src/GLViewer/GLViewer_Drawer.cxx
+++ b/src/GLViewer/GLViewer_Drawer.cxx
@@ -415,6 +415,34 @@ void GLViewer_Drawer::destroyAllTextures()
     for( ; anIt != anEndIt; anIt++ )
         glDeleteTextures( 1, &(anIt.data().myTexFontId) );
 }
+
+//=======================================================================
+// Function: setAntialiasing
+// Purpose : The function enables and disables antialiasing in Open GL (for points, lines and polygons).
+//=======================================================================
+void GLViewer_Drawer::setAntialiasing(const bool on)
+{
+	if (on)
+	{
+    glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
+    glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
+
+		glEnable(GL_POINT_SMOOTH);
+		glEnable(GL_LINE_SMOOTH);
+		glEnable(GL_POLYGON_SMOOTH);
+		glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); 
+		glEnable (GL_BLEND);
+	}
+	else
+	{
+		glDisable(GL_POINT_SMOOTH);
+		glDisable(GL_LINE_SMOOTH);
+		glDisable(GL_POLYGON_SMOOTH);
+		glBlendFunc (GL_ONE, GL_ZERO);
+		glDisable (GL_BLEND);
+	}
+}
+
 //======================================================================
 // Function: loadTexture
 // Purpose :
diff --git a/src/GLViewer/GLViewer_Drawer.h b/src/GLViewer/GLViewer_Drawer.h
index 22ca4842a..0a1379cbd 100644
--- a/src/GLViewer/GLViewer_Drawer.h
+++ b/src/GLViewer/GLViewer_Drawer.h
@@ -187,6 +187,9 @@ public:
 
   //! Returns object priority
   int                             getPriority() const { return myPriority; }
+
+  //! The function enables and disables antialiasing in Open GL (for points, lines and polygons).
+  void                            setAntialiasing(const bool on);
   
   //! Clears all generated textures
   static void                     destroyAllTextures();
-- 
2.39.2