glGetProgramInfoLog keeps returning garbage

[geomazzix]

Dear Sir/Madam,

When checking for errors on the linking and compiling of my shaderProgram it seemed like it does not compile. I have no clue why not so I implemented an errorlog method:

    bool Material::CheckCompileErrors(GLuint id, CompiledObjectType type) const
    {
        GLchar infoLog[1024];
        GLint success = 0;

        switch(type)
        {
        case shader:
            glGetShaderiv(id, GL_COMPILE_STATUS, &success);
            if (success) return true;
            glGetShaderInfoLog(id, 1024, nullptr, infoLog);
            std:: printf("%s", infoLog);
            break;
        case program:
            glGetProgramiv(id, GL_LINK_STATUS, &success);
            if (success) return true;
            glGetProgramInfoLog(id, 1024, nullptr, infoLog);
            std:: printf("%s", infoLog);
            break;
        default:
            assert("That is not a valid type to check for.");
            break;
        }
        return false;
    }

The purpose of it is to return true when compiling/linking went right and when something goes wrong it should log the error, but instead of logging (in this case the linking error) in logs a lot of garbage. I have no clue why it does this, it makes it almost impossible to debug.

If you do know why the glGetPrograminfoLog doesn’t want to fill my infolog array (which is a technically a pointer which it requires) please inform me of what I’m doing wrong.

One last thing, the reason I posted this in the GLSL thread and not in the general is because there was no “post new thread” button.

Cheers,

Geomazzix

[GClements]

Check for errors with glGetError(). If glGetShaderInfoLog or glGetProgramInfoLog fail with an error, they won’t populate the buffer.

Other than that, use a debugger to check what’s actually being passed to those functions and what they return.

[Creepy]

This (or similar) happend to me too a few days ago. Then replaced my compile function with a function from a tutorial and the checkErrorLog() function stopped spitting garbage.