silence some valgrind warnings

2 files changed, 7 insertions, 3 deletions

diff --git a/src/effects/shadereffectitem.cpp b/src/effects/shadereffectitem.cpp
index 60af776..fe53cb9 100644
--- a/src/effects/shadereffectitem.cpp
+++ b/src/effects/shadereffectitem.cpp
@@ -188,6 +188,8 @@ ShaderEffectSource::ShaderEffectSource(QObject *parent)
     , m_refs(0)
     , m_dirtyTexture(true)
     , m_dirtySceneGraph(true)
+    , m_multisamplingSupported(false)
+    , m_checkedForMultisamplingSupport(false)
 {
     m_context = QSGContext::current;
 }
@@ -404,11 +406,12 @@ void ShaderEffectSource::update()
         Q_ASSERT(m_renderer);
 
         const QGLContext *ctx = m_context->glContext();
-        if (m_renderer->openGLFeatures() == 0) {
-            m_renderer->initializeGLFunctions(ctx);
+
+        if (!m_checkedForMultisamplingSupport) {
             QList<QByteArray> extensions = QByteArray((const char *)glGetString(GL_EXTENSIONS)).split(' ');
             m_multisamplingSupported = extensions.contains("GL_EXT_framebuffer_multisample")
-                                    && extensions.contains("GL_EXT_framebuffer_blit");
+                                       && extensions.contains("GL_EXT_framebuffer_blit");
+            m_checkedForMultisamplingSupport = true;
         }
 
         if (!m_fbo) {
diff --git a/src/effects/shadereffectitem.h b/src/effects/shadereffectitem.h
index a1db89a..6fd7415 100644
--- a/src/effects/shadereffectitem.h
+++ b/src/effects/shadereffectitem.h
@@ -175,6 +175,7 @@ private:
     uint m_dirtyTexture : 1; // Causes update no matter what.
     uint m_dirtySceneGraph : 1; // Causes update if not static.
     uint m_multisamplingSupported : 1;
+    uint m_checkedForMultisamplingSupport : 1;
 };
 
 class ShaderEffectNode : public GeometryNode