Bug 42164 - OpenTK-1.0 not logging shader compilation errors correctly
Summary: OpenTK-1.0 not logging shader compilation errors correctly
Alias: None
Product: Android
Classification: Xamarin
Component: General ()
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Radek Doulik
Depends on:
Reported: 2016-06-24 20:52 UTC by Rishub
Modified: 2016-06-28 15:29 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Rishub 2016-06-24 20:52:19 UTC
The code below was compiled with OpenTK-1.0.dll (version

protected override void OnLoad (EventArgs e)
			base.OnLoad (e);

			viewportHeight = Height; viewportWidth = Width;

			string vertexShaderSrc =  "attribute vec4 vPosition    \n" + 
							  "void main()                  \n" +
							  "{                            \n" +
							  "   gl_Position = vPosition;  \n" +
							  "}                            \n";

            int shader = GL.CreateShader(ShaderType.VertexShader);
            GL.ShaderSource(shader, 1, new string[] { vertexShaderSrc }, (int[])null);
            int compiled = 0;
            GL.GetShader(shader, ShaderParameter.CompileStatus, out compiled);
            Log.Debug("VIEW", ""+compiled);
            int length = 0;
            GL.GetShader(shader, ShaderParameter.ShaderType, out length);
            Log.Debug("VIEW", "" + compiled + " " + length);
            var log = new StringBuilder(length);


The above shader string has an error in it (vPosition should have a semicolon) - However, GetShaderInfoLog is empty implying it passed. The length of the log is also zero.  

When I remake the same code and compile with OpenTK.dll (version, the shader compilation fails and returns the expected error string. 

Is there something I am doing incorrectly? Or is this a bug with OpenTK-1.0.dll
Comment 1 Rishub 2016-06-28 15:29:31 UTC

I forgot to set ContextRenderingApi inside OnCreateFrameBuffer()