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  Shaders - compile and linking errors  (Read 3936 times)
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Offline Irbis

Senior Newbie





« Posted 2011-05-19 18:42:14 »

Hello! I have a problem with checking the linking errors. My program works but my function still prints a linker error and I don't have any ideas what is wrong (printing errors for vertex and fragment shader works correctly). However when I use gl = new DebugGL3(gl); I get some errors (refer to gl.glGetShaderiv(shaderProgramID, GL3.GL_LINK_STATUS, IntBuffer.wrap(statusLinker))) and the program doesn't start:


Exception in thread "Timer-0" javax.media.opengl.GLException: javax.media.opengl.GLException: Thread[AWT-EventQueue-0,6,main] glGetError() returned the following error codes after a call to glGetShaderiv(<int> 0x1, <int> 0x8B82, <java.nio.IntBuffer> java.nio.HeapIntBuffer[pos=0 lim=1 cap=1]): GL_INVALID_OPERATION ( 1282 0x502),


My initShaders function:

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    private void initShaders(GL3 gl)
    {
       
        shaderProgramID = gl.glCreateProgram();

        int vertexShaderID = gl.glCreateShader(GL3.GL_VERTEX_SHADER);
        gl.glShaderSource(vertexShaderID, 1, new String[]{vertexShader}, null);
        gl.glCompileShader(vertexShaderID);
        int statusVertexShader[] = new int[1];
        gl.glGetShaderiv(vertexShaderID, GL3.GL_COMPILE_STATUS, IntBuffer.wrap(statusVertexShader));
        if(statusVertexShader[0] == GL3.GL_FALSE)
        {
            int infoLogLenght[] = new int[1];
            gl.glGetShaderiv(vertexShaderID, GL3.GL_INFO_LOG_LENGTH, IntBuffer.wrap(infoLogLenght));
            ByteBuffer infoLog = Buffers.newDirectByteBuffer(infoLogLenght[0]);
            gl.glGetShaderInfoLog(vertexShaderID, infoLogLenght[0], null, infoLog);
            byte[] infoBytes =new byte[infoLogLenght[0]];
            infoLog.get(infoBytes);
            String out =new String(infoBytes);
            System.out.println("Vertex shader error:\n" + out);
        }
        gl.glAttachShader(shaderProgramID, vertexShaderID);
        gl.glDeleteShader(vertexShaderID);

        int fragmentShaderID = gl.glCreateShader(GL3.GL_FRAGMENT_SHADER);
        gl.glShaderSource(fragmentShaderID, 1, new String[]{fragmentShader}, null);
        gl.glCompileShader(fragmentShaderID);
        int statusFragmentShader[] = new int[1];
        gl.glGetShaderiv(fragmentShaderID, GL3.GL_COMPILE_STATUS, IntBuffer.wrap(statusFragmentShader));
        if(statusFragmentShader[0] == GL3.GL_FALSE)
        {
            int infoLogLenght[] = new int[1];
            gl.glGetShaderiv(fragmentShaderID, GL3.GL_INFO_LOG_LENGTH, IntBuffer.wrap(infoLogLenght));
            ByteBuffer infoLog = Buffers.newDirectByteBuffer(infoLogLenght[0]);
            gl.glGetShaderInfoLog(fragmentShaderID, infoLogLenght[0], null, infoLog);
            byte[] infoBytes =new byte[infoLogLenght[0]];
            infoLog.get(infoBytes);
            String out =new String(infoBytes);
            System.out.println("Fragment shader error:\n" + out);
        }
        gl.glAttachShader(shaderProgramID, fragmentShaderID);
        gl.glDeleteShader(fragmentShaderID);
       
       
        gl.glLinkProgram(shaderProgramID);
        gl.glValidateProgram(shaderProgramID);
       
        int statusLinker[] = new int[1];
        gl.glGetShaderiv(shaderProgramID, GL3.GL_LINK_STATUS, IntBuffer.wrap(statusLinker));
        if(statusLinker[0] == GL3.GL_FALSE)
        {
            int infoLogLenght[] = new int[1];
            gl.glGetShaderiv(shaderProgramID, GL3.GL_INFO_LOG_LENGTH, IntBuffer.wrap(infoLogLenght));
            ByteBuffer infoLog = Buffers.newDirectByteBuffer(infoLogLenght[0]);
            gl.glGetShaderInfoLog(shaderProgramID, infoLogLenght[0], null, infoLog);
            byte[] infoBytes =new byte[infoLogLenght[0]];
            infoLog.get(infoBytes);
            String out =new String(infoBytes);
            System.out.println("Linker error:\n" + out);
        }
       
    }
Offline lhkbob

JGO Knight


Medals: 32



« Reply #1 - Posted 2011-05-19 20:20:01 »

According to http://www.opengl.org/sdk/docs/man/xhtml/glGetShader.xml, GL_INVALID_OPERATION is generated if the shader id isn't a shader, and if you're within a glBegin()/glEnd() pair.

At the bottom of your code, you're passing your program id into the glGetShader call.  Since the program id isn't a shader object, this will always fail.  Instead for program queries, use glGetProgram and glGetProgramInfoLog.

Offline gouessej
« Reply #2 - Posted 2011-05-23 09:49:43 »

According to http://www.opengl.org/sdk/docs/man/xhtml/glGetShader.xml, GL_INVALID_OPERATION is generated if the shader id isn't a shader, and if you're within a glBegin()/glEnd() pair.

At the bottom of your code, you're passing your program id into the glGetShader call.  Since the program id isn't a shader object, this will always fail.  Instead for program queries, use glGetProgram and glGetProgramInfoLog.
I found a program with the same mistake when I began using shaders lol. Irbis seems to have used the same source of inspiration than me.

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