fix initialization opengl glitch

src/framework/application.cpp

@@ -208,6 +208,7 @@ void Application::run()
                     m_foregroundFrameCounter.processNextFrame();
 
                     // draw foreground
+                    g_painter->clearScreen();
                     g_ui.render(true);
 
                     // copy the foreground to a texture

src/framework/graphics/graphics.cpp

@@ -86,10 +86,6 @@ void Graphics::init()
     glEnable(GL_CULL_FACE);
     */
 
-    // clear color buffer
-    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
-    glClear(GL_COLOR_BUFFER_BIT);
-
     // determine max texture size
     GLint maxTextureSize = 0;
     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);

src/framework/graphics/painter.cpp

@@ -86,6 +86,12 @@ void Painter::restoreSavedState()
     setTexture(m_olderStates[m_oldStateIndex].texture);
 }
 
+void Painter::clearScreen()
+{
+    glClearColor(0,0,0,1);
+    glClear(GL_COLOR_BUFFER_BIT);
+}
+
 void Painter::setCompositionMode(Painter::CompositionMode compositionMode)
 {
     if(m_compositionMode == compositionMode)

src/framework/graphics/painter.h

@@ -65,6 +65,7 @@ public:
     void saveState();
     void saveAndResetState();
     void restoreSavedState();
+    void clearScreen();
 
     virtual void drawCoords(CoordsBuffer& coordsBuffer, DrawMode drawMode = Triangles) = 0;
     virtual void drawTextureCoords(CoordsBuffer& coordsBuffer, const TexturePtr& texture) = 0;