Improves OpenGL-ES support (especially for Raspberry Pi), contribution of Erkki Nokso-Koivisto

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10267 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/jogl/com/jme3/renderer/jogl/JoglRenderer.java

@@ -2379,6 +2379,10 @@ public class JoglRenderer implements Renderer {
     public void updateVertexArray(Mesh mesh) {
         int id = mesh.getId();
         GL gl = GLContext.getCurrentGL();
+        //FIXME rather use GLCaps and do it once for all
+        boolean isVaoSupported = gl.isFunctionAvailable("glGenVertexArrays") && 
+                gl.isFunctionAvailable("glBindVertexArray");
+        if (isVaoSupported) {
             if (id == -1) {
                 IntBuffer temp = intBuf1;
                 if (gl.isGL2GL3()) {
@@ -2394,6 +2398,7 @@ public class JoglRenderer implements Renderer {
                 }
                 context.boundVertexArray = id;
             }
+        }
 
         VertexBuffer interleavedData = mesh.getBuffer(Type.InterleavedData);
         if (interleavedData != null && interleavedData.isUpdateNeeded()) {