Fix ClearColor for Scene3D usage.

QtQuick renderer resets OpenGL state every frame. Thus we need
to explicitly set the clearColor, too, every frame.

Task-number: QTBUG-52712
Change-Id: I872e2e57db6d436d5754a6f5fa14588fbcc6f544
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/render/graphicshelpers/graphicscontext.cpp b/src/render/graphicshelpers/graphicscontext.cpp
index f3e5fd32f..e309fee32 100644
--- a/src/render/graphicshelpers/graphicscontext.cpp
+++ b/src/render/graphicshelpers/graphicscontext.cpp
@@ -218,6 +218,12 @@ bool GraphicsContext::beginDrawing(QSurface *surface)
         initialize();
     }
 
+    // need to reset these values every frame, may get overwritten elsewhere
+    m_gl->functions()->glClearColor(m_currClearColorValue.redF(), m_currClearColorValue.greenF(), m_currClearColorValue.blueF(), m_currClearColorValue.alphaF());
+    m_gl->functions()->glClearDepthf(m_currClearDepthValue);
+    m_gl->functions()->glClearStencil(m_currClearStencilValue);
+
+
     if (m_activeShader)
         m_activeShader = NULL;