GL_INVALID_OPERATION errors from ofxUI

[moonryul]

Hi, I have been testing an application which uses ofxUICanvas class several days. I have been tracking GL_INVALID_OPERATION errors in my application code. Finally I found out that these errors come from ofxUICanvas::draw() method. I am using the core profile of opengl by using the following main:

int main() {
ofSetCurrentRenderer(ofGLProgrammableRenderer::TYPE);

ofSetLogLevel(OF_LOG_VERBOSE);
ofSetupOpenGL(1024,768, OF_WINDOW);     
ofRunApp( new ofApp());

}

ofxUICanvas::draw() calls glDisable(GL_LIGHTING) which is deprecated in the core profile.
This error seems to occur because I use the core profile, whereas the draw() method uses
deprecated commands.

This error also occurs in the following part of the draw() method:

vector<ofxUIWidget *>::reverse_iterator it = widgets.rbegin();
vector<ofxUIWidget *>::reverse_iterator eit = widgets.rend();
for(; it != eit; ++it) {
if((_it)->isVisible() && ((_it)->getRect()->rInside(_rect) || (_it)->isModal())) {
(*it)->draw();
checkGlErrors();

    }
}

Question 1: My guess that these GL_INVALID_OPERATON errors are caused by using the core profile is correct?

Question 2: Can I ignore these errors, because GL_INVALID_OPERATION errors simply ignore the
offending commands, so that the result is the same as when I do not use these commands?

Question 3: Is there a version of ofxUI which nicely incorporates the core profile?

SIncerely yours
Moon Jung