Gldrawarrays Only Updates When I Exit

I have this code in python3 which doesn't work on windows machines but it worked on a linux machine. I draw a green screen and a red triangle but the red triangle only appears when

Solution 1:

I draw a green screen and a red triangle but the red triangle only appears when i exit.

If the display mode is pygame.OPENGL, pygame.display.flip() performs a GL buffer swap.

You need to enable double buffering by setting the pygame.DOUBLEBUF display mode flag (see pygame.display.set_mode()):

screen = pygame.display.set_mode((800, 600), pygame.OPENGL | pygame.DOUBLEBUF)

If you do not want to use double buffering, you must force the execution of GL commands manually with glFlush():

run = Truewhile run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False# [...]

    gl.glFlush() # force the execution of GL commands