def getGLFrame(frame, points, output_width, output_height):
############## OpengGL ##############
p1, p2, p3 = points[39], points[42], points[33]
w, h = output_width, output_height
p1 = [(p1[1] / w) * 2 - 1, -((p1[0] / h) * 2 - 1)]
p2 = [(p2[1] / w) * 2 - 1, -((p2[0] / h) * 2 - 1)]
p3 = [(p3[1] / w) * 2 - 1, -((p3[0] / h) * 2 - 1)]
triangle = Triangle(p1, p2, p3)
tri_program = ShaderProgram(fragment=triangle.fragment, vertex=triangle.vertex)
triangle.loadVBOs(tri_program)
triangle.loadElements()
glClear(GL_COLOR_BUFFER_BIT)
glClearColor (0.0, 0.0, 0.0, 1.0)
#-----------------------------------#
QUAD_PROGRAM.start()
toolbox.bind(QUAD)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_BGR, GL_UNSIGNED_BYTE, frame)
glDrawElements(GL_TRIANGLES, len(QUAD.elements) * 3, GL_UNSIGNED_INT, None)
toolbox.unbind()
QUAD_PROGRAM.stop()
#-----------------------------------#
tri_program.start()
toolbox.bind(triangle)
glDrawElements(GL_TRIANGLES, len(triangle.elements) * 3, GL_UNSIGNED_INT, None)
toolbox.unbind()
tri_program.stop()
#-----------------------------------#
glFinish()
glPixelStorei(GL_PACK_ALIGNMENT, 1)
buffer = glReadPixels(0, 0, output_width, output_height, GL_BGR, GL_UNSIGNED_BYTE)
image = Image.frombytes('RGB', (output_width, output_height), buffer)
image = image.transpose(Image.FLIP_TOP_BOTTOM)
frame = np.asarray(image, dtype=np.uint8)
glutSwapBuffers()
#####################################
return frame
