Python OpenGL.GL.glClear() Examples

def paintGL(self):
        self.makeCurrent()
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        self.program.bind()

        self.program.enableAttributeArray("position")
        self.vbo.bind()
        gl.glVertexAttribPointer(self.program.attributeLocation("position"), 2, gl.GL_FLOAT, gl.GL_FALSE, 0, self.vbo)


        self.program.enableAttributeArray("normal")
        self.vbo_cols.bind()
        gl.glVertexAttribPointer(self.program.attributeLocation("normal"), 3, gl.GL_FLOAT, gl.GL_FALSE, 0, self.vbo_cols)


        gl.glDrawArrays(gl.GL_TRIANGLES, 0, len(self.data))



        print(self.context().format().majorVersion())
        print(self.context().format().minorVersion())


        print(gl.glGetString(gl.GL_VERSION)); 

def render(self, context):
        self.shader.bind()

        flipY = -1
        projection = utils.createPerspectiveOrtho(-1.0, 1.0, 1.0 * flipY, -1.0 * flipY, -1.0, 1.0)
        self.shader.uniformMatrix4f(shader.PROJECTION, projection)
        self.shader.uniformf("imageSize", *self.getSize())

        self.setUniforms(self.shader, context.uniforms)

        self.textureMap.bindTextures(self.shader)

        gl.glClearColor(*self.clearColor)
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)

        self.bindAttributeArray(self.shader, "inVertex", self.verts, 4)
        gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, len(self.verts) // 4);
        self.unbindAttributeArray(self.shader, "inVertex")

        self.textureMap.unbindTextures()

        self.shader.unbind() 

def main_cocos2d():
    class HelloWorld(ImguiLayer):
        is_event_handler = True

        def __init__(self):
            super(HelloWorld, self).__init__()
            self._text = "Input text here"

        def draw(self, *args, **kwargs):
            imgui.new_frame()
            on_frame()
            gl.glClearColor(1., 1., 1., 1)
            gl.glClear(gl.GL_COLOR_BUFFER_BIT)
            imgui.render()

    director.init(width=800, height=600, resizable=True)
    hello_layer = HelloWorld()
    main_scene = cocos.scene.Scene(hello_layer)
    director.run(main_scene)


# backend-independent frame rendering function: 

def paintGL(self):
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)
        if not self.first:
            return
        f = open('opengl_test.txt', 'w')
        gl_version = float(gl.glGetString(gl.GL_VERSION)[:3])
        f.write('Supported OpenGL version: %.1f\n' % gl_version)
        if gl_version >= 2.0:
            f.write('Supported GLSL version: ' +
                    gl.glGetString(gl.GL_SHADING_LANGUAGE_VERSION).decode() + '\n')
            f.write('Context was valid in initializeGL? %d\n' % self.was_valid_in_init)
            numext = gl.glGetIntegerv(gl.GL_NUM_EXTENSIONS)
            f.write('Supported OpenGL extensions:' + '\n')
            extensions = ''
            for i in range(numext):
                extensions += ', ' + gl.glGetStringi(gl.GL_EXTENSIONS, i).decode()
            f.write(extensions)
        f.close()
        self.first = False 

def main_glfw():
    def glfw_init():
        width, height = 1280, 720
        window_name = "minimal ImGui/GLFW3 example"
        if not glfw.init():
            print("Could not initialize OpenGL context")
            exit(1)
        # OS X supports only forward-compatible core profiles from 3.2
        glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 3)
        glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 3)
        glfw.window_hint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
        glfw.window_hint(glfw.OPENGL_FORWARD_COMPAT, gl.GL_TRUE)
        # Create a windowed mode window and its OpenGL context
        window = glfw.create_window(
            int(width), int(height), window_name, None, None
        )
        glfw.make_context_current(window)
        if not window:
            glfw.terminate()
            print("Could not initialize Window")
            exit(1)
        return window
    window = glfw_init()
    impl = GlfwRenderer(window)
    while not glfw.window_should_close(window):
        glfw.poll_events()
        impl.process_inputs()
        imgui.new_frame()
        on_frame()
        gl.glClearColor(1., 1., 1., 1)
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)
        imgui.render()
        impl.render(imgui.get_draw_data())
        glfw.swap_buffers(window)
    impl.shutdown()
    glfw.terminate() 

def main_pygame():
    pygame.init()
    size = 800, 600
    pygame.display.set_mode(size, pygame.DOUBLEBUF | pygame.OPENGL)
    io = imgui.get_io()
    io.fonts.add_font_default()
    io.display_size = size
    renderer = PygameRenderer()
    while 1:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            renderer.process_event(event)
        imgui.new_frame()
        on_frame()
        # note: cannot use screen.fill((1, 1, 1)) because pygame's screen
        #       does not support fill() on OpenGL sufraces
        gl.glClearColor(1, 1, 1, 1)
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)
        imgui.render()
        pygame.display.flip() 

def render_rgb_indexed_colors(self, **kwargs):
        '''Draws scene in the background buffer to extract mouse click info'''
        import OpenGL.GL as gl
        import OpenGL.GLU as glu
        gl.glMatrixMode(gl.GL_MODELVIEW)
        gl.glLoadIdentity()
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        # camera_pos_rtp is relative to the target position. To get the
        # absolute camera position, we need to add the target position.
        gl.glPushMatrix()
        camera_pos_xyz = np.array(rtp_to_xyz(*self.camera_pos_rtp)) \
            + self.target_pos
        glu.gluLookAt(
            *(list(camera_pos_xyz) + list(self.target_pos) + self.up))
        self.draw_data_set()
        gl.glPopMatrix()
        gl.glFlush() 

def main():
    pangolin.CreateWindowAndBind('Main', 640, 480)
    gl.glEnable(gl.GL_DEPTH_TEST)

    # Define Projection and initial ModelView matrix
    scam = pangolin.OpenGlRenderState(
        pangolin.ProjectionMatrix(640, 480, 420, 420, 320, 240, 0.2, 100),
        pangolin.ModelViewLookAt(-2, 2, -2, 0, 0, 0, pangolin.AxisY))

    tree = pangolin.Renderable()
    tree.Add(pangolin.Axis())

    # Create Interactive View in window
    handler = pangolin.SceneHandler(tree, scam)
    dcam = pangolin.CreateDisplay()
    dcam.SetBounds(0.0, 1.0, 0.0, 1.0, -640.0 /480.0)
    dcam.SetHandler(handler)

    def draw(view):
        view.Activate(scam)
        tree.Render()
    dcam.SetDrawFunction(draw)

    while not pangolin.ShouldQuit():
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        # or
        # dcam.Activate(scam)
        # tree.Render()

        pangolin.FinishFrame() 

def clear(self):
        if self.drawBackground:
            GL.glClearColor(0.25, 0.27, 0.77, 1.0)
        else:
            GL.glClearColor(0.0, 0.0, 0.0, 0.0)
        GL.glClear(GL.GL_DEPTH_BUFFER_BIT | GL.GL_COLOR_BUFFER_BIT) 

def paintGL(self):
        GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
        GL.glLoadIdentity()
        GL.glTranslated(0.0, 0.0, -10.0)
        GL.glRotated(self.xRot / 16.0, 1.0, 0.0, 0.0)
        GL.glRotated(self.yRot / 16.0, 0.0, 1.0, 0.0)
        GL.glRotated(self.zRot / 16.0, 0.0, 0.0, 1.0)
        GL.glCallList(self.object) 

def initializeGL(self):
        GL.glClearColor(1.0, 0.0, 0.0, 1.0)
        GL.glEnable(GL.GL_BLEND)
        GL.glBlendFunc (GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA)
        GL.glClear(GL.GL_COLOR_BUFFER_BIT)

        print("OpenGL.GL: " + str(GL.glGetString(GL.GL_VERSION)))
        print("GL.GLSL: " + str(GL.glGetString(GL.GL_SHADING_LANGUAGE_VERSION)))
        print("OpenGL ATTRIBUTES:\n",", ".join(d for d in dir(GL) if d.startswith("GL_")))

        self.program = QOpenGLShaderProgram()
        self.program.addShaderFromSourceCode(QOpenGLShader.Vertex, """#version 120
        attribute vec2 position;
        attribute vec2 texcoord;
        varying vec2 mytexcoord;
        void main() {
            gl_Position = vec4(position, 0., 1.0);
            mytexcoord = texcoord;
        }""")

        self.program.addShaderFromSourceCode(QOpenGLShader.Fragment, """#version 120
        uniform sampler2D texture;
        varying vec2 mytexcoord;
        void main() {
            
            gl_FragColor = texture2D(texture,mytexcoord);
        }""")
        print(self.program.log())
        self.program.link()

        self.texture = fillTexture2d(np.outer(np.linspace(0, 1, 128), np.ones(128))) 

def paintGL(self):
        #GL.glClear(GL.GL_COLOR_BUFFER_BIT)
        self.program.bind()

        self.program.enableAttributeArray("position")
        self.program.enableAttributeArray("texcoord")
        self.program.setAttributeArray("position", self.quadCoord)
        self.program.setAttributeArray("texcoord", self.quadCoordTex)

        GL.glActiveTexture(GL.GL_TEXTURE0)
        GL.glBindTexture(GL.GL_TEXTURE_2D, self.texture)
        self.program.setUniformValue("texture", 0)

        GL.glDrawArrays(GL.GL_TRIANGLES, 0, len(self.quadCoord)) 

def paintGL(self):
        self.makeCurrent()
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        self.program.bind()

        self.program.enableAttributeArray("position")
        self.vbo.bind()
        gl.glVertexAttribPointer(self.program.attributeLocation("position"), 2, gl.GL_FLOAT, gl.GL_FALSE, 0, self.vbo)


        self.program.enableAttributeArray("color")
        self.vbo_cols.bind()
        gl.glVertexAttribPointer(self.program.attributeLocation("color"), 3, gl.GL_FLOAT, gl.GL_FALSE, 0, self.vbo_cols)

        self.vbo_index.bind()

        #gl.glDrawArrays(gl.GL_TRIANGLES, 0, len(self.data))

        gl.glDrawElements(gl.GL_TRIANGLES, len(self.index), gl.GL_UNSIGNED_INT, None)

        print(self.context().format().majorVersion())
        print(self.context().format().minorVersion())


        print(gl.glGetString(gl.GL_VERSION)); 

def main():
    # Create OpenGL window in single line
    pangolin.CreateWindowAndBind('Main', 640, 480)

    # Data logger object
    log = pangolin.DataLog()

    # Optionally add named labels
    labels = ['sin(t)', 'cos(t)', 'sin(t)+cos(t)']
    log.SetLabels(labels)

    # OpenGL 'view' of data. We might have many views of the same data.
    tinc = 0.03
    plotter = pangolin.Plotter(log, 0.0, 4.0*np.pi/tinc, -2.0, 2.0, np.pi/(4*tinc), 0.5)
    plotter.SetBounds(0.0, 1.0, 0.0, 1.0)
    plotter.Track('$i')

    # Add some sample annotations to the plot
    plotter.AddMarker(pangolin.Marker.Vertical, -1000, pangolin.Marker.LessThan, 
        pangolin.Colour.Blue().WithAlpha(0.2))
    plotter.AddMarker(pangolin.Marker.Horizontal, 100, pangolin.Marker.GreaterThan, 
        pangolin.Colour.Red().WithAlpha(0.2))
    plotter.AddMarker(pangolin.Marker.Horizontal,  10, pangolin.Marker.Equal, 
        pangolin.Colour.Green().WithAlpha(0.2))

    pangolin.DisplayBase().AddDisplay(plotter)


    t = 0
    while not pangolin.ShouldQuit():
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        log.Log(np.sin(t), np.cos(t), np.sin(t)+np.cos(t))
        t += tinc

        pangolin.FinishFrame() 

def gl_clear(self):
        from OpenGL import GL
        
        bg = self.bg_color
        if bg:
            r = bg[0] / 255.0
            g = bg[1] / 255.0
            b = bg[2] / 255.0
            GL.glClearColor(r, g, b, 0.0)
        GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT) 

def main():
    pangolin.CreateWindowAndBind('Main', 640, 480)
    gl.glEnable(gl.GL_DEPTH_TEST)

    # Define Projection and initial ModelView matrix
    scam = pangolin.OpenGlRenderState(
        pangolin.ProjectionMatrix(640, 480, 420, 420, 320, 240, 0.2, 100),
        pangolin.ModelViewLookAt(-2, 2, -2, 0, 0, 0, pangolin.AxisDirection.AxisY))
    handler = pangolin.Handler3D(scam)

    # Create Interactive View in window
    dcam = pangolin.CreateDisplay()
    dcam.SetBounds(0.0, 1.0, 0.0, 1.0, -640.0/480.0)
    dcam.SetHandler(handler)

    while not pangolin.ShouldQuit():
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
        gl.glClearColor(1.0, 1.0, 1.0, 1.0)
        dcam.Activate(scam)
        
        # Render OpenGL Cube
        pangolin.glDrawColouredCube()

        # Draw Point Cloud
        points = np.random.random((100000, 3)) * 10
        colors = np.zeros((len(points), 3))
        colors[:, 1] = 1 -points[:, 0] / 10.
        colors[:, 2] = 1 - points[:, 1] / 10.
        colors[:, 0] = 1 - points[:, 2] / 10.

        gl.glPointSize(2)
        gl.glColor3f(1.0, 0.0, 0.0)
        # access numpy array directly(without copying data), array should be contiguous.
        pangolin.DrawPoints(points, colors)    

        pangolin.FinishFrame() 

def render(self, time, frametime):
        GL.glClearColor(
            (math.sin(time) + 1.0) / 2,
            (math.sin(time + 2) + 1.0) / 2,
            (math.sin(time + 3) + 1.0) / 2,
            1.0,
        )
        GL.glClear(GL.GL_COLOR_BUFFER_BIT) 

def display():
        gl.glClear (gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
        glut.glutSwapBuffers() 

def render(self, pixmap, viewport_shape):
    """Renders the pixmap on a fullscreen quad.

    Args:
      pixmap: A 3D numpy array of bytes (np.uint8), with dimensions
        (width, height, 3).
      viewport_shape: A tuple of two elements, (width, height).
    """
    GL.glClear(GL.GL_COLOR_BUFFER_BIT)
    GL.glViewport(0, 0, *viewport_shape)
    GL.glUseProgram(self._shader)
    GL.glActiveTexture(GL.GL_TEXTURE0)
    GL.glBindTexture(GL.GL_TEXTURE_2D, self._texture)
    GL.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, 1)
    GL.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGB, pixmap.shape[1],
                    pixmap.shape[0], 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE,
                    pixmap)
    GL.glUniform1i(self._var_texture_sampler, 0)
    GL.glDrawArrays(GL.GL_TRIANGLE_STRIP, 0, 4) 

def render_scene(self, eye):
        GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
        GL.glEnable(GL.GL_DEPTH_TEST)
        if self.show_cubes:
            GL.glUseProgram(self.scene_program)
            GL.glUniformMatrix4fv(
                self.scene_matrix_location, 1, False,
                self.get_current_view_projection_matrix(eye))
            GL.glBindVertexArray(self.scene_vao)
            GL.glBindTexture(GL.GL_TEXTURE_2D, self.i_texture)
            GL.glDrawArrays(GL.GL_TRIANGLES, 0, int(self.vert_count))
            GL.glBindVertexArray(0)
        b_is_input_available = self.hmd.isInputAvailable()
        if b_is_input_available:
            # draw the controller axis lines
            GL.glUseProgram(self.controller_transform_program)
            GL.glUniformMatrix4fv(self.controller_matrix_location, 1, False, self.get_current_view_projection_matrix(eye))
            GL.glBindVertexArray(self.controller_vao)
            GL.glDrawArrays(GL.GL_LINES, 0, self.controller_vertex_count)
            GL.glBindVertexArray(0)
        # ----- Render Model rendering -----
        GL.glUseProgram(self.render_model_program)
        for hand in self.hand:
            if not hand.show_controller:
                continue
            if hand.render_model is None:
                continue
            mvp = hand.pose @ self.get_current_view_projection_matrix(eye)
            GL.glUniformMatrix4fv(self.render_model_matrix_location, 1, False, mvp)
            hand.render_model.draw()
        GL.glUseProgram(0) 

def run_main_loop(self):
        while not glfw.window_should_close(self.window):
            self.handle_input()
            self.render_frame()
            glfw.swap_buffers(self.window)
            GL.glClearColor(0, 0, 0, 1)
            GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
            glfw.poll_events() 

def gl_clear(self):
        #from OpenGL import GL
        
        bg = self.bg_color
        if bg:
            r = bg[0] / 255.0
            g = bg[1] / 255.0
            b = bg[2] / 255.0
            GL.glClearColor(r, g, b, 0.0)
        GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT) 

def clear(self):
        if self.drawBackground:
            GL.glClearColor(0.25, 0.27, 0.77, 1.0)
        else:
            GL.glClearColor(0.0, 0.0, 0.0, 0.0)
        GL.glClear(GL.GL_DEPTH_BUFFER_BIT | GL.GL_COLOR_BUFFER_BIT) 

def paintGL(self):
        if self.opengl:
            GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
            self.opengl.draw(self.defaultFramebufferObject(), self.width(), -self.height()) 

def viewer_refresh(self, q):
    while not q.empty():
      self.state = q.get()

    gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
    gl.glClearColor(0.0, 0.0, 0.0, 1.0)
    self.dcam.Activate(self.scam)

    if self.state is not None:
      if self.state[0].shape[0] >= 2:
        # draw poses
        gl.glColor3f(0.0, 1.0, 0.0)
        pangolin.DrawCameras(self.state[0][:-1])

      if self.state[0].shape[0] >= 1:
        # draw current pose as yellow
        gl.glColor3f(1.0, 1.0, 0.0)
        pangolin.DrawCameras(self.state[0][-1:])

      if self.state[1].shape[0] != 0:
        # draw keypoints
        gl.glPointSize(5)
        gl.glColor3f(1.0, 0.0, 0.0)
        pangolin.DrawPoints(self.state[1], self.state[2])

    pangolin.FinishFrame() 

def main():
    pangolin.CreateWindowAndBind('Main', 640, 480)
    gl.glEnable(gl.GL_DEPTH_TEST)

    # Define Projection and initial ModelView matrix
    scam = pangolin.OpenGlRenderState(
        pangolin.ProjectionMatrix(640, 480, 420, 420, 320, 240, 0.2, 100),
        pangolin.ModelViewLookAt(-2, 2, -2, 0, 0, 0, pangolin.AxisDirection.AxisY))
    handler = pangolin.Handler3D(scam)

    # Create Interactive View in window
    dcam = pangolin.CreateDisplay()
    dcam.SetBounds(0.0, 1.0, 0.0, 1.0, -640.0/480.0)
    dcam.SetHandler(handler)
    dcam.Resize(pangolin.Viewport(0,0,640*2,480*2))

    while not pangolin.ShouldQuit():
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
        gl.glClearColor(1.0, 1.0, 1.0, 1.0)
        dcam.Activate(scam)
        
        # Render OpenGL Cube
        pangolin.glDrawColouredCube()

        # Draw Point Cloud
        points = np.random.random((100000, 3)) * 10
        colors = np.zeros((len(points), 3))
        colors[:, 1] = 1 -points[:, 0] / 10.
        colors[:, 2] = 1 - points[:, 1] / 10.
        colors[:, 0] = 1 - points[:, 2] / 10.

        gl.glPointSize(2)
        gl.glColor3f(1.0, 0.0, 0.0)
        # access numpy array directly(without copying data), array should be contiguous.
        pangolin.DrawPoints(points, colors)    

        pangolin.FinishFrame() 

def render(self, context):
        self.shader.bind()

        gl.glDisable(gl.GL_BLEND)
        gl.glEnable(gl.GL_DEPTH_TEST)

        gl.glClearDepth(1.0)
        gl.glClearColor(*self.clearColor)
        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        view, projection = createDefaultMatrices(self.width, self.height, context)
        self.shader.uniformMatrix4f(shader.VIEW_MATRIX, view)
        self.shader.uniformMatrix4f(shader.PROJ_MATRIX, projection)

        self.setUniforms(self.shader, context.uniforms)

        for tag, entry in self.models.items():
            mesh = entry.mesh

            entry.textureMap.bindTextures(self.shader)

            self.shader.uniformMatrix4f(shader.WORLD_MATRIX, entry.matrix)

            self.bindAttributeArray(self.shader, "inPosition", mesh.vertices, 3)
            self.bindAttributeArray(self.shader, "inNormal", mesh.normals, 3)
            self.bindAttributeArray(self.shader, "inUv", mesh.uvs, 2)
            gl.glDrawArrays(gl.GL_TRIANGLES, 0, len(mesh.vertices) // 3)
            self.unbindAttributeArray(self.shader, "inPosition")
            self.unbindAttributeArray(self.shader, "inNormal")
            self.unbindAttributeArray(self.shader, "inUv")

            entry.textureMap.unbindTextures()

        gl.glEnable(gl.GL_BLEND)
        gl.glDisable(gl.GL_DEPTH_TEST)

        self.shader.unbind() 

def render(self, context):
        self.shader.bind()

        self.setUniforms(self.shader, context.uniforms)
        self.shader.uniformf("screenSize", *self.getSize())

        gl.glClearColor(*self.clearColor)
        gl.glClear(gl.GL_COLOR_BUFFER_BIT)
        gl.glDisable(gl.GL_DEPTH_TEST)

        transforms = self.computeBoneTransforms()

        boneMatrixArray = []
        for i, transform in enumerate(transforms):
            boneMatrix = transform.matrix
            boneMatrix.p = transform.transparency #Abuse unused matrix location

            overwrite = transform.damping > 0.0
            if overwrite and self.oldFrameData.get(transform.bone.name):
                overwrite = self.dampenBoneTransform(context, transform)

            if overwrite:
                self.oldFrameData[transform.bone.name] = SkinnedFrameData(context.shownTime, transform)

            boneMatrixArray.extend(utils.matrixToList(boneMatrix))
        self.shader.uniformMatrix4fArray("boneMatrices", boneMatrixArray)

        for transform in transforms:
            self.renderBoneTransform(transform, context)

        for i in range(2):
            gl.glActiveTexture(gl.GL_TEXTURE0 + i)
            gl.glBindTexture(gl.GL_TEXTURE_2D, 0)

        gl.glActiveTexture(gl.GL_TEXTURE0)

        self.shader.unbind() 

def display():
        gl.glClear (gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
        glut.glutSwapBuffers() 

def on_paint(self, event):
        """Process the drawing event."""
        import OpenGL.GL as gl
        import OpenGL.GLU as glu
        self.canvas.SetCurrent(self.canvas.context)

        if not self.gl_initialized:
            self.initgl()
            self.gl_initialized = True
            self.print_help()

        if self.light:
            gl.glEnable(gl.GL_LIGHTING)
        else:
            gl.glDisable(gl.GL_LIGHTING)

        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
        gl.glLoadIdentity()
        gl.glPushMatrix()
        glu.gluLookAt(*(list(rtp_to_xyz(
            *self.camera_pos_rtp)) + list(self.target_pos) + list(self.up)))

        self.draw_cube()

        gl.glPopMatrix()
        gl.glFlush()
        self.SwapBuffers()
        event.Skip()