From 4c0f5e2da92e861228abc89e4b9b116803a761ce Mon Sep 17 00:00:00 2001
From: Gunnar Sletta <gunnar.sletta@nokia.com>
Date: Wed, 15 Jun 2011 10:08:43 +0200
Subject: [PATCH] Print out a warning when attributes are enabled

---
 src/declarative/scenegraph/coreapi/qsgrenderer.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/declarative/scenegraph/coreapi/qsgrenderer.cpp b/src/declarative/scenegraph/coreapi/qsgrenderer.cpp
index dbf704b..cc24cc0 100644
--- a/src/declarative/scenegraph/coreapi/qsgrenderer.cpp
+++ b/src/declarative/scenegraph/coreapi/qsgrenderer.cpp
@@ -229,6 +229,21 @@ void QSGRenderer::renderScene(const Bindable &bindable)
     int bindTime = frameTimer.elapsed();
 #endif
 
+#ifndef QT_NO_DEBUG
+    // Sanity check that attribute registers are disabled
+    {
+        GLint count;
+        glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &count);
+        GLint enabled;
+        for (int i=0; i<count; ++i) {
+            glGetVertexAttribiv(i, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &enabled);
+            if (enabled) {
+                qWarning("QSGRenderer: attribute %d is enabled, this can lead to memory corruption and crashes.", i);
+            }
+        }
+    }
+#endif
+
     render();
 #ifdef QSG_RENDERER_TIMING
     int renderTime = frameTimer.elapsed();
-- 
2.7.4