glCopyTexImage2D error - GL_INVALID_ENUM

I have a problem with glCopyTexImage2D - look at this util method which is cutting previously rendered scene to the texture:

    public static Texture cutRenderToTexture(GL g, int width, int height) {
        IntBuffer buff = Buffers.newDirectIntBuffer(1);
        g.glGenTextures(1, buff);
        int tex = buff.get();
        g.glBindTexture(GL.GL_TEXTURE_2D, tex);
        checkGLError(g);
        g.glCopyTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA, 0, 0, width, height, 0);
        checkGLError(g);
        g.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        return TextureIO.newTexture(tex, GL.GL_TEXTURE_2D, width, height, width, height, false);
    }

checkGLError is a simple method which is checking all possible OpenGL errors - in this example I am calling it twice to show that problem can be related only to glCopyTexImage2D call. I am getting GL_INVALID_ENUM error, but target is valid, GL_TEXTURE_2D enabled and OpenGL docs do not specify if this error can happen in any other case.

Any ideas what is wrong?

There are some other possible root causes mentioned in the man:
https://www.opengl.org/sdk/docs/man4/xhtml/glCopyTexImage2D.xml

A guess is that you need to tell GL about the mip map levels. After bind texture
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_BASE_LEVEL, 0);
gl.glTexParameteri(GL4.GL_TEXTURE_2D, GL4.GL_TEXTURE_MAX_LEVEL, 0);

The default for GL is to assume that textures have mip maps and that might trip you up. I don't recall the error I got before I added those lines but it might have been invalid enum.

@gouessej - only one possible cause for GL_INVALID_ENUM is mentioned.

@jmaasing - still the same error

I think this is JOGL-related issue - I wrote similar code in LWJGL and it works.

On 01/20/2014 12:39 AM, Mac70 [via jogamp] wrote:
> @gouessej - only one possible cause for GL_INVALID_ENUM is mentioned.
>
> @jmaasing - still the same error
>
> I think this is JOGL-related issue - I wrote similar code in LWJGL and it works.

Dunno ..

Please provide a complete smallest unit-test (copy one of our many),
or standalone test class allowing us to reproduce the issue.

Please attach this to a new bug report if you don't mind helping us
managing this issue well.

Thank you.

~Sven

Mac70 wrote

@gouessej - only one possible cause for GL_INVALID_ENUM is mentioned.

Oops, you're right, only the first one matches.

Mac70 wrote

@jmaasing - still the same error

I think this is JOGL-related issue - I wrote similar code in LWJGL and it works.

Sorry but I use this method in Ardor3D JOGL 2 renderer and it works. Please follow Sven's advice, provide a tiny test case, maybe there is something obviously wrong.