Added Sys.NULL constant

src/java/org/lwjgl/Sys.java

@@ -82,10 +82,16 @@ public final class Sys {
 	 * the library, and whether assertions are enabled or not.
 	 */
 	public static final boolean DEBUG;
+
+	/**
+	 * The integer equivalent of the native NULL constant
+	 */
+	public static final int NULL;
 	
 	
 	private static boolean _debug;
 	static {
+                NULL = nGetNULLValue();
 		try {
 			assert false;
 			LIBRARY_NAME = "lwjgl";
@@ -123,6 +129,11 @@ public final class Sys {
 		setTime(0);
 	}		
 
+        /**
+         * Gets the native NULL constant value
+         */
+        private static native int nGetNULLValue();
+
 	/**
 	 * Gets the address of a buffer. If the address cannot be obtained for any reason
 	 * then this method returns 0.

src/native/common/org_lwjgl_Sys.h

@@ -18,8 +18,17 @@ extern "C" {
 #define org_lwjgl_Sys_REALTIME_PRIORITY 2L
 /* Inaccessible static: LIBRARY_NAME */
 /* Inaccessible static: DEBUG */
+/* Inaccessible static: NULL */
 /* Inaccessible static: _debug */
-/* Inaccessible static: class_000240 */
+/* Inaccessible static: class_00024org_00024lwjgl_00024Sys */
+/*
+ * Class:     org_lwjgl_Sys
+ * Method:    nGetNULLValue
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_org_lwjgl_Sys_nGetNULLValue
+  (JNIEnv *, jclass);
+
 /*
  * Class:     org_lwjgl_Sys
  * Method:    getDirectBufferAddress

src/native/linux/org_lwjgl_Sys.cpp

@@ -48,6 +48,17 @@ long int		hires_timer_freq;			// Hires timer frequency
 long int		hires_timer_start;			// Hires timer start
 long int		hires_timer;				// Hires timer current time
 
+/*
+ * Class:     org_lwjgl_Sys
+ * Method:    nGetNULLValue
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_org_lwjgl_Sys_nGetNULLValue
+  (JNIEnv *, jclass)
+{
+	return (jint)NULL;
+}
+  
 /*
  * Class:     org_lwjgl_Sys
  * Method:    getDirectBufferAddress

src/native/win32/org_lwjgl_Sys.cpp

@@ -49,6 +49,17 @@ __int64		hires_timer_freq;			// Hires timer frequency
 __int64		hires_timer_start;			// Hires timer start
 __int64		hires_timer;				// Hires timer current time
 
+/*
+ * Class:     org_lwjgl_Sys
+ * Method:    nGetNULLValue
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_org_lwjgl_Sys_nGetNULLValue
+  (JNIEnv *, jclass)
+{
+	return (jint)NULL;
+}
+
 /*
  * Class:     org_lwjgl_Sys
  * Method:    getDirectBufferAddress