1 files changed, 24 insertions, 0 deletions
diff --git a/src/opengl/qglbuffer.cpp b/src/opengl/qglbuffer.cpp
index 2ab7c32..755f34c 100644
--- a/src/opengl/qglbuffer.cpp
+++ b/src/opengl/qglbuffer.cpp
@@ -289,6 +289,10 @@ bool QGLBuffer::read(int offset, void *data, int count)
 */
 void QGLBuffer::write(int offset, const void *data, int count)
 {
+#ifndef QT_NO_DEBUG
+    if (!isCreated())
+        qWarning("QGLBuffer::allocate(): buffer not created");
+#endif
     Q_D(QGLBuffer);
     if (d->guard.id())
         glBufferSubData(d->type, offset, count, data);
@@ -305,6 +309,10 @@ void QGLBuffer::write(int offset, const void *data, int count)
 */
 void QGLBuffer::allocate(const void *data, int count)
 {
+#ifndef QT_NO_DEBUG
+    if (!isCreated())
+        qWarning("QGLBuffer::allocate(): buffer not created");
+#endif
     Q_D(QGLBuffer);
     if (d->guard.id())
         glBufferData(d->type, count, data, d->actualUsagePattern);
@@ -336,6 +344,10 @@ void QGLBuffer::allocate(const void *data, int count)
 */
 bool QGLBuffer::bind() const
 {
+#ifndef QT_NO_DEBUG
+    if (!isCreated())
+        qWarning("QGLBuffer::bind(): buffer not created");
+#endif
     Q_D(const QGLBuffer);
     GLuint bufferId = d->guard.id();
     if (bufferId) {
@@ -364,6 +376,10 @@ bool QGLBuffer::bind() const
 */
 void QGLBuffer::release() const
 {
+#ifndef QT_NO_DEBUG
+    if (!isCreated())
+        qWarning("QGLBuffer::release(): buffer not created");
+#endif
     Q_D(const QGLBuffer);
     if (d->guard.id())
         glBindBuffer(d->type, 0);
@@ -453,6 +469,10 @@ int QGLBuffer::size() const
 void *QGLBuffer::map(QGLBuffer::Access access)
 {
     Q_D(QGLBuffer);
+#ifndef QT_NO_DEBUG
+    if (!isCreated())
+        qWarning("QGLBuffer::map(): buffer not created");
+#endif
     if (!d->guard.id())
         return 0;
     if (!glMapBufferARB)
@@ -476,6 +496,10 @@ void *QGLBuffer::map(QGLBuffer::Access access)
 bool QGLBuffer::unmap()
 {
     Q_D(QGLBuffer);
+#ifndef QT_NO_DEBUG
+    if (!isCreated())
+        qWarning("QGLBuffer::unmap(): buffer not created");
+#endif
     if (!d->guard.id())
         return false;
     if (!glUnmapBufferARB)