From 1afb38470f58e84c1e7c2d2b3813a5924026a253 Mon Sep 17 00:00:00 2001
From: ouv <ouv@opencascade.com>
Date: Fri, 16 Dec 2005 16:30:43 +0000
Subject: [PATCH] Fixed bug with displaying of the point sprites on the
 machines with weak video cards.

---
 src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx | 10 +++++-----
 src/PIPELINE/VISU_OpenGLPointSpriteMapper.hxx |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
index 1041ef4b..f52a7bc6 100755
--- a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
+++ b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
@@ -378,7 +378,7 @@ void VISU_OpenGLPointSpriteMapper::SetPointSpriteAlphaThreshold( float theAlphaT
   this->PointSpriteAlphaThreshold = theAlphaThreshold;
 }
 //-----------------------------------------------------------------------------
-void VISU_OpenGLPointSpriteMapper::InitExtensions()
+bool VISU_OpenGLPointSpriteMapper::InitExtensions()
 {
   char* ext = (char*)glGetString( GL_EXTENSIONS );
   //cout << "OpenGL extensions : " << ext << endl;
@@ -391,13 +391,14 @@ void VISU_OpenGLPointSpriteMapper::InitExtensions()
 
     this->UseOpenGLMapper = true;
 
-    return;
+    return false;
   }
 
   if( this->UseShader )
     this->InitShader();
 
   this->ExtensionsInitialized = 1;
+  return true;
 }
 
 //-----------------------------------------------------------------------------
@@ -432,13 +433,12 @@ void VISU_OpenGLPointSpriteMapper::RenderPiece(vtkRenderer *ren, vtkActor *act)
 
   if( !this->ExtensionsInitialized && isUseThisMapper )
   {
-    this->InitExtensions();
-    //act->GetProperty()->SetPointSize( 10.0f );
+    if( !this->InitExtensions() )
+      return;
   }
 
   if( !isUseThisMapper )
   {
-    //cout << "Using OpenGLMapper" << endl;
     MAPPER_SUPERCLASS::RenderPiece( ren, act );
     return;
   }
diff --git a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.hxx b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.hxx
index a05b57ad..1ddb55ff 100755
--- a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.hxx
+++ b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.hxx
@@ -228,7 +228,7 @@ protected:
 			       vtkActor *act);
 
   //! Initializing OpenGL extensions.
-  void              InitExtensions();
+  bool              InitExtensions();
 
   //! Activate Point Sprites.
   void              InitPointSprites();
-- 
2.39.2