# coding: utf-8
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#
# Copyright (c) 2017 European Synchrotron Radiation Facility
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"""Test OpenGL"""

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "10/08/2017"


import logging
import unittest

from silx.gui._glutils import gl, OpenGLWidget
from silx.gui.utils.testutils import TestCaseQt
from silx.gui import qt


_logger = logging.getLogger(__name__)


class TestOpenGL(TestCaseQt):
    """Tests of OpenGL widget."""

    class OpenGLWidgetLogger(OpenGLWidget):
        """Widget logging information of available OpenGL version"""

        def __init__(self):
            self._dump = False
            super(TestOpenGL.OpenGLWidgetLogger, self).__init__(version=(1, 0))

        def paintOpenGL(self):
            """Perform the rendering and logging"""
            if not self._dump:
                self._dump = True
                _logger.info('OpenGL info:')
                _logger.info('\tQt OpenGL context version: %d.%d', *self.getOpenGLVersion())
                _logger.info('\tGL_VERSION: %s' % gl.glGetString(gl.GL_VERSION))
                _logger.info('\tGL_SHADING_LANGUAGE_VERSION: %s' %
                             gl.glGetString(gl.GL_SHADING_LANGUAGE_VERSION))
                _logger.debug('\tGL_EXTENSIONS: %s' % gl.glGetString(gl.GL_EXTENSIONS))

            gl.glClearColor(1., 1., 1., 1.)
            gl.glClear(gl.GL_COLOR_BUFFER_BIT)

    def testOpenGL(self):
        """Log OpenGL version using an OpenGLWidget"""
        super(TestOpenGL, self).setUp()
        widget = self.OpenGLWidgetLogger()
        widget.show()
        widget.setAttribute(qt.Qt.WA_DeleteOnClose)
        self.qWaitForWindowExposed(widget)
        widget.close()
