From Lionel Largarde, "fix for the Image::computeNumberOfMipmapLevels…

… method. The method did use the float version of the log function and the / operator.

It works for most of the input sizes, but fails for 8192, 32768...
For 8192, the method returns 13 instead of 14."



git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14814 16af8721-9629-0410-8352-f15c8da7e697

src/osg/Image.cpp

@@ -833,7 +833,11 @@ int Image::computeNumberOfMipmapLevels(int s,int t, int r)
 {
     int w = maximum(s, t);
     w = maximum(w, r);
-    return 1 + static_cast<int>(floor(logf(w)/logf(2.0f)));
+
+    int n = 0;
+    while (w >>= 1)
+        ++n;
+    return n+1;
 }
 
 bool Image::isCompressed() const