diff --git a/opengl/tools/glgen/src/JniCodeEmitter.java b/opengl/tools/glgen/src/JniCodeEmitter.java
index b0997b1..7340357 100644
--- a/opengl/tools/glgen/src/JniCodeEmitter.java
+++ b/opengl/tools/glgen/src/JniCodeEmitter.java
@@ -890,16 +890,10 @@
                                 cname +
                                 " = (" +
                                 cfunc.getArgType(cIndex).getDeclaration() +
-                                ") _env->GetDirectBufferAddress(" +
-                                (mUseCPlusPlus ? "" : "_env, ") +
+                                ") getDirectBufferPointer(_env, " +
                                 cname + "_buf);");
                         String iii = "    ";
-                        out.println(iii + indent + "if ( ! " + cname + " ) {");
-                        out.println(iii + iii + indent +
-                                (mUseCPlusPlus ? "_env" : "(*_env)") +
-                                "->ThrowNew(" +
-                                (mUseCPlusPlus ? "" : "_env, ") +
-                                "IAEClass, \"Must use a native order direct Buffer\");");
+                        out.println(iii + indent + "if ( ! " + cname + " ) {");	
                         out.println(iii + iii + indent + "return;");
                         out.println(iii + indent + "}");
                     } else {
diff --git a/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp
index 3948fd3..e1c09f4 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp
@@ -132,6 +132,19 @@
 					   commit ? 0 : JNI_ABORT);
 }
 
+static void *
+getDirectBufferPointer(JNIEnv *_env, jobject buffer) {
+    char* buf = (char*) _env->GetDirectBufferAddress(buffer);
+    if (buf) {
+        jint position = _env->GetIntField(buffer, positionID);
+        jint elementSizeShift = _env->GetIntField(buffer, elementSizeShiftID);
+        buf += position << elementSizeShift;
+    } else {
+        _env->ThrowNew(IAEClass, "Must use a native order direct Buffer");
+    }
+    return (void*) buf;
+}
+
 static int
 getNumCompressedTextureFormats() {
     int numCompressedTextureFormats = 0;
diff --git a/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp b/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp
index 11c6087..4896acb 100644
--- a/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp
+++ b/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp
@@ -132,6 +132,19 @@
 					   commit ? 0 : JNI_ABORT);
 }
 
+static void *
+getDirectBufferPointer(JNIEnv *_env, jobject buffer) {
+    char* buf = (char*) _env->GetDirectBufferAddress(buffer);
+    if (buf) {
+        jint position = _env->GetIntField(buffer, positionID);
+        jint elementSizeShift = _env->GetIntField(buffer, elementSizeShiftID);
+        buf += position << elementSizeShift;
+    } else {
+        _env->ThrowNew(IAEClass, "Must use a native order direct Buffer");
+    }
+    return (void*) buf;
+}
+
 static int
 getNumCompressedTextureFormats() {
     int numCompressedTextureFormats = 0;