QtQuick: clean up shader effect property connections

- Don't use a signal mapper, but handle the mapping using a custom slot
  object and a lambda to do the dispatching ourselves.
- Don't do meta-calls by property name, but by index.
- Cache the meta-object.
- Resolve the property indices by using the QML property cache.

For a shader with 6 property connections, the time spent goes from 320k
instructions to 80k instructions (valgrind on x86_64).

Task-number: QTBUG-53901
Change-Id: I2809198cf62f9716b3683798222203fc3e97fbb3
Reviewed-by: Robin Burchell <robin.burchell@viroteck.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/particles/qquickcustomparticle_p.h b/src/particles/qquickcustomparticle_p.h
index d9690aa96a..e9d68cbe5c 100644
--- a/src/particles/qquickcustomparticle_p.h
+++ b/src/particles/qquickcustomparticle_p.h
@@ -99,9 +99,10 @@ protected:
 
 private Q_SLOTS:
     void sourceDestroyed(QObject *object);
-    void propertyChanged(int mappedId);
 
 private:
+    void propertyChanged(int mappedId);
+
     typedef QQuickOpenGLShaderEffectMaterialKey Key;
     typedef QQuickOpenGLShaderEffectMaterial::UniformData UniformData;
 
@@ -109,6 +110,7 @@ private:
     void updateVertexShader();
 
     QQuickOpenGLShaderEffectCommon m_common;
+    const QMetaObject *m_myMetaObject;
 
     QHash<int, QQuickOpenGLShaderEffectNode*> m_nodes;
     qreal m_lastTime;