GLRenderer: put max anisotropy into limits map

jme3-core/src/main/java/com/jme3/renderer/Limits.java

@@ -77,4 +77,6 @@ public enum Limits {
     DepthTextureSamples,
 
     VertexUniformVectors,
+    
+    TextureAnisotropy,
 }

jme3-core/src/main/java/com/jme3/renderer/opengl/GLExt.java

@@ -68,6 +68,7 @@ public interface GLExt {
 	public static final int GL_MAX_DEPTH_TEXTURE_SAMPLES = 0x910F;
         public static final int GL_MAX_DRAW_BUFFERS_ARB = 0x8824;
 	public static final int GL_MAX_SAMPLES_EXT = 0x8D57;
+        public static final int GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FF;
 	public static final int GL_MULTISAMPLE_ARB = 0x809D;
         public static final int GL_NUM_PROGRAM_BINARY_FORMATS = 0x87FE;
         public static final int GL_PIXEL_PACK_BUFFER_ARB = 0x88EB;

jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java

@@ -374,6 +374,7 @@ public class GLRenderer implements Renderer {
 
         if (hasExtension("GL_EXT_texture_filter_anisotropic")) {
             caps.add(Caps.TextureFilterAnisotropic);
+            limits.put(Limits.TextureAnisotropy, getInteger(GLExt.GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT));
         }
 
         if (hasExtension("GL_EXT_framebuffer_object")