I dunno if it's supposed to do that but what I imagine is that four lines are drawn, from x1,y1 to x2,y2 to x3,y3 to x4,y4 and back to x1,y1 again, and when the last pixel of the last line is meant to be drawn, it overlaps the first pixel which was drawn, cancelling it out??
glPolygonMode(GL_BACK,GL_FILL) problem ?
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