Moved defined into GLDefines header to avoid compile issues under Windows

include/osg/GLDefines

@@ -646,6 +646,19 @@ typedef char GLchar;
     #define GL_MAX_3D_TEXTURE_SIZE      0x8073
 #endif
 
+#ifndef GL_TEXTURE_MIN_LOD
+    #define GL_TEXTURE_MIN_LOD          0x813A
+#endif
+
+#ifndef GL_TEXTURE_MAX_LOD
+    #define GL_TEXTURE_MAX_LOD          0x813B
+#endif
+
+#ifndef GL_TEXTURE_LOD_BIAS
+    #define GL_TEXTURE_LOD_BIAS         0x8501
+#endif
+
+
 #ifndef GL_INTERLEAVED_ATTRIBS
     #define GL_INTERLEAVED_ATTRIBS      0x8C8C
 #endif

src/osg/Sampler.cpp

@@ -15,13 +15,6 @@
 #include <osg/Sampler>
 #include <osg/Texture3D>
 
-#ifndef GL_TEXTURE_MIN_LOD
-#define GL_TEXTURE_MIN_LOD 0x813A
-#endif
-
-#ifndef GL_TEXTURE_MAX_LOD
-#define GL_TEXTURE_MAX_LOD 0x813B
-#endif
 
 #ifndef GL_TEXTURE_WRAP_R
 #define GL_TEXTURE_WRAP_R 0x2804
@@ -35,10 +28,6 @@
 #define GL_TEXTURE_COMPARE_FUNC 0x884D
 #endif
 
-#ifndef GL_TEXTURE_LOD_BIAS
-#define GL_TEXTURE_LOD_BIAS 0x8501
-#endif
-
 
 using namespace osg;