+ * This is called before rendering any scene in the next frame. This method should be preceded
+ * by a call up Update.
+ * Multi-threading note: this method should be called from a dedicated rendering thread.
+ * @pre The GL context must have been created, and made current.
+ * @param[out] status showing whether update is required to run.
+ * @param[in] forceClear force the Clear on the framebuffer even if nothing is rendered.
+ * @param[in] uploadOnly uploadOnly Upload the resource only without rendering.
+ */
+ void PreRender( Integration::RenderStatus& status, bool forceClear, bool uploadOnly );
+
+ // This method should be called from Core::PreRender()
+
+ /**
+ * This is called before rendering any scene in the next frame. This method should be preceded
+ * by a call up Update.
+ * Multi-threading note: this method should be called from a dedicated rendering thread.
+ * @pre The GL context must have been created, and made current.
+ * @param[in] scene The scene to be rendered.
+ * @param[out] damagedRects The list of damaged rects for the current render pass.
+ */
+ void PreRender( Integration::Scene& scene, std::vector<Rect<int>>& damagedRects );
+
+ // This method should be called from Core::RenderScene()
+
+ /**
+ * Render a scene in the next frame. This method should be preceded by a call up PreRender.
+ * This method should be called twice. The first pass to render off-screen frame buffers if any,
+ * and the second pass to render the surface.
+ * Multi-threading note: this method should be called from a dedicated rendering thread.
+ * @pre The GL context must have been created, and made current.