Core profile check.

            FOR DEBUG PURPOSES ONLY

def core_profile_check(self) -> None:
        '''
            Core profile check.

            FOR DEBUG PURPOSES ONLY
        '''

        profile_mask = self.info['GL_CONTEXT_PROFILE_MASK']
        if profile_mask != 1:
            warnings.warn('The window should request a CORE OpenGL profile')

        version_code = self.version_code
        if not version_code:
            major, minor = map(int, self.info['GL_VERSION'].split('.', 2)[:2])
            version_code = major * 100 + minor * 10

        if version_code < 330:
            warnings.warn('The window should support OpenGL 3.3+ (version_code=%d)' % version_code)