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Drawing an image outside the viewport

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Ok, I''m trying to setup a window that has the viewport confined to the top right corner of the screen, and a GUI running along the left and bottom of the window. I''ve relocated the viewport no problems, but I need to paste an image over the remaining areas of the window to represent the interface. The problem is glRasterPos() wants a world coordinate within the viewport. I''ve noticed when I don''t specify the raster position, it''s drawing from the bottom left by default. That would be perfect, except that I''m also using glRasterPos() to position images within the viewport, and I have no way of resetting it to the bottom left again. Is there a way to set the raster position in window coordinates rather than world coordinates, or is there some other drawing routine to do the job?

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