Python OpenGL-线程中没有有效的上下文

Question

我有一个要在其中更新显示颜色（RGB）的窗口。为此，我使用Flask（1.1.1）接收请求，并使用Python 3.7接收用于窗口的PyOpenGL（3.1.0）。该系统在Ubuntu 18.04上运行。

[仅在运行窗口时，它会工作并显示正确的颜色。但是，由于glutMainLoop()正在阻塞，我想在线程中运行它。

这给了我以下异常：

File "/home/aaa/Desktop/raspberry_pi_display_controller/monitor_manager.py", line 72, in timerFuncWrapper
    self.timerFunc(val)
File "/home/aaa/Desktop/raspberry_pi_display_controller/monitor_manager.py", line 78, in timerFunc
    glutTimerFunc(val, self.timerFuncWrapper, val)
File "/home/aaa/.local/lib/python3.7/site-packages/OpenGL/GLUT/special.py", line 158, in __call__
    callbacks = contextdata.getValue( self.CONTEXT_DATA_KEY )
File "/home/aaa/.local/lib/python3.7/site-packages/OpenGL/contextdata.py", line 104, in getValue
    context = getContext( context )
File "/home/aaa/.local/lib/python3.7/site-packages/OpenGL/contextdata.py", line 41, in getContext
    """Attempt to retrieve context when no valid context"""
OpenGL.error.Error: Attempt to retrieve context when no valid context

据我在线所知，只要一次仅一个线程在OpenGL上运行，就可以在一个线程中运行OpenGL。我希望主线程运行Flask服务器，并且该线程专用于调整窗口的颜色。我该如何实施？

这里是在线程中运行的代码：

from OpenGL.GLUT import *
from OpenGL.GL import *
import sys
from threading import Thread, Event


class MonitorManager(Thread):

    def __init__(self):
        super().__init__()

        self.event = Event()

        self.window_name = "Pi"
        self.red = 1.0
        self.blue = 1.0
        self.green = 1.0
        self.alpha = 1.0

        self.init_glut()

    def init_glut(self):
        glutInit(sys.argv)
        glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_BORDERLESS | GLUT_CAPTIONLESS)
        glutCreateWindow(self.window_name)
        glutSetCursor(GLUT_CURSOR_NONE)
        glutDisplayFunc(self.displayFuncWrapper)
        glutIdleFunc(self.idleFuncWrapper)
        glutTimerFunc(0, self.timerFuncWrapper, 100)

    def run(self):
        glutMainLoop()

    def displayFuncWrapper(self):
        try:
            self.displayFunc()
        except Exception as e:
            exit(-1)

    def displayFunc(self):
        glClearColor(self.red, self.green, self.blue, self.alpha)
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)  # clear the screen to the color of glClearColor
        glutSwapBuffers()
        return

    def idleFuncWrapper(self):
        try:
            self.idleFunc()
        except Exception as e:
            exit(-1)

    def idleFunc(self):
        if self.event.is_set():
            exit(-1)

    def timerFuncWrapper(self, val):
        try:
            self.timerFunc(val)
        except Exception as e:
            exit(-1)

    def timerFunc(self, val):
        self.displayFuncWrapper()
        glutTimerFunc(val, self.timerFuncWrapper, val)

    def update_colors(self, red, green, blue, alpha):
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha


if __name__ == '__main__':
    a = MonitorManager()
    a.start()