QtOpenGL: use nullary version of qRegisterMetaType<T>("T")

Using the nullary version has the advantage that multiple calls
during a program run are much more efficient, since an inlined
atomic is used to store the result. For this, it requires
Q_DECLARE_METATYPE(T), so add, too.

Change-Id: Ic9a9013aa13ff9d8f917f9df033dd2197944f84a
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index b0a430551f..c2b16f91e0 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -377,12 +377,16 @@ private:
     QGLContext *m_ctx;
 };
 
+QT_END_NAMESPACE
+Q_DECLARE_METATYPE(GLuint)
+QT_BEGIN_NAMESPACE
+
 class Q_OPENGL_EXPORT QGLTextureDestroyer : public QObject
 {
     Q_OBJECT
 public:
     QGLTextureDestroyer() : QObject() {
-        qRegisterMetaType<GLuint>("GLuint");
+        qRegisterMetaType<GLuint>();
         connect(this, SIGNAL(freeTexture(QGLContext *, QPlatformPixmap *, GLuint)),
                 this, SLOT(freeTexture_slot(QGLContext *, QPlatformPixmap *, GLuint)));
     }