void DrawView()
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This is the OpenGL implementation for the render base class virtual function.
It is called to render the scene and does the following order of operations:
1) Calls InitView to initialize global render setting for the frame
2) Clears the zbuffer, color buffer is flyengine->clearbk is TRUE
and stencil buffer if flyengine->stencil is TRUE
3) Draws the scene and all objects inside view frustum
4) Initialize text mode and draw all 2D stuff
5) Swaps buffers to display rendered image