I am passing an application from GDI to OpenGL, with C++ and Visual Studio, on Windows.
I must display Topographic/Geographic maps in an application using OpenGL. Texts have various orientations and different sizes. Though I gained speed in other elements drawing, passing from GDI to OpenGL, the same seems not to happen either using bitmap or outline fonts with glCallList function. Worse, it seems much slower than GDI... In OpenGL Bible the authors refuse to explain these topics giving an hint to use texture maps.
So which is the method giving maximum speed in drawing texts, having different dimensions and orientations? Shall I have a real increase of speed or the actual situation will stay more or less the same?