ENH: GL_NO_ACCEL as a compile option

CMakeLists.txt

@@ -224,6 +224,12 @@ IF(OTB_USE_VISU_GUI)
         IF(OPENGL_INCLUDE_DIR)
                 INCLUDE_DIRECTORIES(${OPENGL_INCLUDE_DIR})
         ENDIF(OPENGL_INCLUDE_DIR)
+
+	#-------------------------------
+        # Display images using textures using video card acceleration
+        #-------------------------------
+	OPTION(GL_NO_ACCEL "Do not use video card acceleration." OFF)
+	MARK_AS_ADVANCED(GL_NO_ACCEL)
         
         #-------------------------------
         # FLTK Library

Code/Visu/otbImageWidgetBase.txx

@@ -18,7 +18,6 @@
 #ifndef __otbImageWidgetBase_txx
 #define __otbImageWidgetBase_txx
 
-#define GL_NO_ACCEL
 
 #include "itkImageRegionConstIterator.h"
 #include "itkMacro.h"