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m_elias's picture

Suggestions for a OpenTK rookie (line stipple)

Posted Wednesday, 22 February, 2012 - 16:39 by m_elias in

I've just started playing around with OpenTK, I have no previous OpenGL or DirectX type programming experience. I have been reading through OpenGL Superbible, Fourth Edition by Wright/Lipchak/Haemel and I would appreciate some pointers on how to convert the examples etc to OpenTK. At this point, specifically line stipple. I'm probably missing something obvious.

I am enabling it in my init routine.
GL.Enable(EnableCap.LineStipple);

Then in my rendering routine I am drawing a grid.

                GL.Begin(BeginMode.Lines);
                {
                    for (double i = -100.0; i < 101.0; i++)
                    {
                        GL.LineStipple(2, Convert.ToInt16("1111000011110000",2));
                        GL.Vertex3(i, -0.01, -100.0);
                        GL.Vertex3(i, -0.01, 100.0);
                        GL.LineStipple(1, Convert.ToInt16("1111111111111111", 2));
                        GL.Vertex3(-100, -0.01, i);
                        GL.Vertex3(100, -0.01, i);
                    }
 
                }
                GL.End();

It just shows up with solid lines, as if it's completely ignoring the stipple commands.

‹ Strange Access Violation after Attempting to Load a Texture Overlay Vertex Buffer Objects ›

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flopoloco's picture

Re: Suggestions for a OpenTK rookie (line stipple)

Posted Thursday, 23 February, 2012 - 01:54 by flopoloco

Here it is the code...

GL.Enable(EnableCap.LineStipple);
 
			for (double i = -100d; i <= 100d; i++)
			{
				GL.LineStipple(1, Convert.ToInt16("1111000011110000",2));
				GL.Begin(BeginMode.Lines);
				GL.Vertex3(i, -0.01, -100.0);
				GL.Vertex3(i, -0.01, 100.0);
				GL.End();
 
				GL.LineStipple(1, Convert.ToInt16("1010101001010101",2));				
				GL.Begin(BeginMode.LineStrip);
				GL.Vertex3(-100, -0.01, i);
				GL.Vertex3(100, -0.01, i);
				GL.End();
			}
 
			GL.End();

For more information
http://www.java-tips.org/other-api-tips/jogl/how-to-draw-lines-in-differ...

m_elias's picture

Re: Suggestions for a OpenTK rookie (line stipple)

Posted Thursday, 23 February, 2012 - 18:11 by m_elias

Ok, so commands such as GL.LineStipple have to be before/outside the GL.Begin/End blocks.

Thanks.