From Andreas Henne, Support for GL3 core profile in osgText

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14717 16af8721-9629-0410-8352-f15c8da7e697

src/osgText/DefaultFont.cpp

@@ -198,13 +198,13 @@ void DefaultFont::constructGlyphs()
         for(unsigned char* p=data;p<data+dataSize;) { *p++ = 0; }
 
         glyph->setImage(sourceWidth,sourceHeight,1,
-                        GL_ALPHA,
-                        GL_ALPHA,GL_UNSIGNED_BYTE,
+                        OSGTEXT_GLYPH_INTERNALFORMAT,
+                        OSGTEXT_GLYPH_FORMAT, GL_UNSIGNED_BYTE,
                         data,
                         osg::Image::USE_NEW_DELETE,
                         1);
 
-        glyph->setInternalTextureFormat(GL_ALPHA);
+        glyph->setInternalTextureFormat(OSGTEXT_GLYPH_INTERNALFORMAT);
 
         // now populate data array by converting bitmap into a luminance_alpha map.
         unsigned char* ptr = rasters[i-32];