CODEWITHSUNDEEP
javaopengllwjgl
Bastian Globig
Bastian Globig

Reputation: 45

OpenGL LWJGL Invalid Enum

I'm tring to implement a Shader in a LWJGL Application. Got an 'invalid Enum' Exception if i try to attach the Shader. Okay, Code talke more....

private void attach(int progID) {
    GL20.glAttachShader(progID,  vertShaderID);
    GL20.glAttachShader(progID, fragShaderID);
    System.out.println("Tester: " + GLU.gluErrorString(GL11.glGetError()));
    GL20.glLinkProgram(progID);
    System.out.println("Tester: " + GLU.gluErrorString(GL11.glGetError()));
    if(GL20.glGetShader(progID, GL20.GL_LINK_STATUS) == GL11.GL_FALSE) {
        System.err.println("error during linking shaders! " + GL20.glGetProgramInfoLog(progID, 1000) + " " + GLU.gluErrorString(GL11.glGetError()));
    }

    GL20.glValidateProgram(progID);
    System.out.println(GL20.glGetProgramInfoLog(progID, 1000));
    System.out.println("Tester: " + GLU.gluErrorString(GL11.glGetError()));
    System.out.println(GL20.glGetProgramInfoLog(progID, 1000));
    if(GL20.glGetShader(progID, GL20.GL_VALIDATE_STATUS) == GL11.GL_FALSE) {
        System.err.println("error during validating shaders! " + GL20.glGetProgramInfoLog(progID, 1000) + " " + GLU.gluErrorString(GL11.glGetError()));
    }

}

produces output:

Tester: No error

Tester: No error

Validation successfull

Tester: Invalid Enum

Validation successfull

So i follow the source of Exception to this Function. What does this Validation Function? If the program Log is 'Validation successfull', what produces this Error? Or is that Error called from any other Situation where I used a GL Function in the Application? And what means The Invlaid Enum Error? It means that i used a GL Type wrong?

Upvotes: 1

Views: 636

Answers (1)

Andon M. Coleman
Andon M. Coleman

Reputation: 43359

GL_LINK_STATUS is not something you can query with glGetShader{iv} (...), that is for shader status. You probably meant to use GL_COMPILE_STATUS for each of your shaders.

GL20.glGetShader (vertShaderID, GL20.GL_COMPILE_STATUS);
GL20.glGetShader (fragShaderID, GL20.GL_COMPILE_STATUS);

GL_LINK_STATUS is only a valid enum for glGetProgram{iv} (...):

GL20.glGetProgram (progID, GL20.GL_LINK_STATUS);

Ideally you should check the compile status for each shader, and then the link status after linking all shaders using the functions and enums I mentioned above.

Upvotes: 2

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