Added alignment checks to PointerBuffer constructor.

src/java/org/lwjgl/BufferUtils.java

@@ -192,4 +192,14 @@ public final class BufferUtils {
 
 	/** Fill buffer with zeros from position to remaining */
 	private static native void zeroBuffer0(Buffer b, long off, long size);
+
+	/**
+	 * Returns the memory address of the specified buffer.
+	 *
+	 * @param buffer the buffer
+	 *
+	 * @return the memory address
+	 */
+	static native long getBufferAddress(Buffer buffer);
+
 }

src/java/org/lwjgl/PointerBuffer.java

@@ -59,8 +59,8 @@ public class PointerBuffer implements Comparable {
 
 	protected final ByteBuffer pointers;
 
-	protected final Buffer view;
-	protected final IntBuffer view32;
+	protected final Buffer     view;
+	protected final IntBuffer  view32;
 	protected final LongBuffer view64;
 
 	/**
@@ -83,6 +83,10 @@ public class PointerBuffer implements Comparable {
 		if ( !source.isDirect() )
 			throw new IllegalArgumentException("ByteBuffer is not direct");
 
+		final int alignment = is64Bit ? 8 : 4;
+		if ( (BufferUtils.getBufferAddress(source) + source.position()) % alignment != 0 || source.remaining() % alignment != 0 )
+			throw new IllegalArgumentException("The source buffer is not aligned to " + alignment + " bytes.");
+
 		pointers = source.slice().order(source.order());
 
 		if ( is64Bit ) {

src/native/common/org_lwjgl_BufferUtils.c

@@ -2,4 +2,8 @@
 
 JNIEXPORT void JNICALL Java_org_lwjgl_BufferUtils_zeroBuffer0(JNIEnv *env, jclass clazz, jobject buffer, jlong offset, jlong size) {
 	memset((char*)(*env)->GetDirectBufferAddress(env, buffer) + (size_t)offset, 0, (size_t)size);
+}
+
+JNIEXPORT jlong JNICALL Java_org_lwjgl_BufferUtils_getBufferAddress(JNIEnv *env, jclass clazz, jobject buffer) {
+    return (uintptr_t)(*env)->GetDirectBufferAddress(env, buffer);
 }