outline

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fredborg

this should work:

Function DrawImageOutline(img:TImage,x:Float,y:Float,thickness:Int=1)
	
	Local r:Int,g:Int,b:Int
	GetColor(r,g,b)
	SetColor(0,0,0)
	For Local dx:Int = -thickness To thickness
		For Local dy:Int = -thickness To thickness
			DrawImage(img,x+dx,y+dy)
		Next
	Next
	SetColor(r,g,b)
	DrawImage(img,x,y)

EndFunction

Although it isn't OpenGL specific, you can do the same..