在Raspberry Pi上运行PyQt5 - "PyQt5._QOpenGLFunctions_ES2“错误

Question

我在树莓派4上运行PyQt5时遇到了一个问题。

我使用的是raspberry pi 4，版本10 (buster)内核版本4.19.75-v71。

默认的python是3.7.3。

我遵循了在这个线程here中提到的安装sip和PyQt5的完全相同的步骤。我还按照上述线程中介绍的步骤安装了python 3.6.0。

在没有任何错误的情况下完成安装后，当我运行我的代码时，我会遇到以下错误消息：

qt5ct: using qt5ct plugin

QEGLPlatformContext: Failed to create context: 3009

QOpenGLWindow::beginPaint: Failed to create context

QOpenGLWindow::beginPaint: Failed to make context current

Traceback (most recent call last):

  File "my_code.py", line 68, in initializeGL

    self.gl = self.context().versionFunctions()

AttributeError: module 'PyQt5._QOpenGLFunctions_ES2' has no attribute 'QOpenGLFunctions_ES2'

Aborted

如何克服这个问题有什么建议吗？非常感谢。提前谢谢。

PS代码在Win10上运行流畅。因此，代码本身必须没有问题。( Win10上的环境是: numpy=1.14.3；numpy-stl=2.5.0；pyqt5=5.10.1；sip=4.19.8；six=1.11.0；python=3.6.0；python-utils=2.3.0)

Answer 1

也许你可以尝试重新安装pyqt5来解决这个问题。查看是否有线程正在占用pip/pyqt5/qmake.exe。或者看看你的GPU，它是OpenGL2.0或更高版本吗？

你说问题是由"self.gl=self.context().versionFunctions()“造成的，我写了一个例子，你可以试试：

    import sys
    import math
    from PyQt5.QtCore import pyqtSignal, QPoint, QSize, Qt
    from PyQt5.QtGui import QColor
    from PyQt5.QtWidgets import (QApplication, QHBoxLayout, QOpenGLWidget, QSlider,
                                 QWidget)
    
    import OpenGL.GL as gl
    
    
    class Window(QWidget):
    
        def __init__(self):
            super(Window, self).__init__()
    
            self.glWidget = GLWidget()
    
            self.xSlider = self.createSlider()
            self.ySlider = self.createSlider()
            self.zSlider = self.createSlider()
    
            self.xSlider.valueChanged.connect(self.glWidget.setXRotation)
            self.glWidget.xRotationChanged.connect(self.xSlider.setValue)
            self.ySlider.valueChanged.connect(self.glWidget.setYRotation)
            self.glWidget.yRotationChanged.connect(self.ySlider.setValue)
            self.zSlider.valueChanged.connect(self.glWidget.setZRotation)
            self.glWidget.zRotationChanged.connect(self.zSlider.setValue)
    
            mainLayout = QHBoxLayout()
            mainLayout.addWidget(self.glWidget)
            mainLayout.addWidget(self.xSlider)
            mainLayout.addWidget(self.ySlider)
            mainLayout.addWidget(self.zSlider)
            self.setLayout(mainLayout)
    
            self.xSlider.setValue(15 * 16)
            self.ySlider.setValue(345 * 16)
            self.zSlider.setValue(0 * 16)
    
            self.setWindowTitle("Hello GL")
    
        def createSlider(self):
            slider = QSlider(Qt.Vertical)
    
            slider.setRange(0, 360 * 16)
            slider.setSingleStep(16)
            slider.setPageStep(15 * 16)
            slider.setTickInterval(15 * 16)
            slider.setTickPosition(QSlider.TicksRight)
    
            return slider
    
    
    class GLWidget(QOpenGLWidget):
        xRotationChanged = pyqtSignal(int)
        yRotationChanged = pyqtSignal(int)
        zRotationChanged = pyqtSignal(int)
    
        def __init__(self, parent=None):
            super(GLWidget, self).__init__(parent)
    
            self.object = 0
            self.xRot = 0
            self.yRot = 0
            self.zRot = 0
    
            self.lastPos = QPoint()
    
            self.trolltechGreen = QColor.fromCmykF(0.40, 0.0, 1.0, 0.0)
            self.trolltechPurple = QColor.fromCmykF(0.39, 0.39, 0.0, 0.0)
    
        def getOpenglInfo(self):
            info = """
                Vendor: {0}
                Renderer: {1}
                OpenGL Version: {2}
                Shader Version: {3}
            """.format(
                gl.glGetString(gl.GL_VENDOR),
                gl.glGetString(gl.GL_RENDERER),
                gl.glGetString(gl.GL_VERSION),
                gl.glGetString(gl.GL_SHADING_LANGUAGE_VERSION)
            )
    
            return info
    
        def minimumSizeHint(self):
            return QSize(50, 50)
    
        def sizeHint(self):
            return QSize(400, 400)
    
        def setXRotation(self, angle):
            angle = self.normalizeAngle(angle)
            if angle != self.xRot:
                self.xRot = angle
                self.xRotationChanged.emit(angle)
                self.update()
    
        def setYRotation(self, angle):
            angle = self.normalizeAngle(angle)
            if angle != self.yRot:
                self.yRot = angle
                self.yRotationChanged.emit(angle)
                self.update()
    
        def setZRotation(self, angle):
            angle = self.normalizeAngle(angle)
            if angle != self.zRot:
                self.zRot = angle
                self.zRotationChanged.emit(angle)
                self.update()
    
        def initializeGL(self):
            print(self.getOpenglInfo())
    
            self.setClearColor(self.trolltechPurple.darker())
            self.object = self.makeObject()
            gl.glShadeModel(gl.GL_FLAT)
            gl.glEnable(gl.GL_DEPTH_TEST)
            gl.glEnable(gl.GL_CULL_FACE)
    
        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 resizeGL(self, width, height):
            side = min(width, height)
            if side  360 * 16:
                angle -= 360 * 16
            return angle
    
        def setClearColor(self, c):
            gl.glClearColor(c.redF(), c.greenF(), c.blueF(), c.alphaF())
    
        def setColor(self, c):
            gl.glColor4f(c.redF(), c.greenF(), c.blueF(), c.alphaF())
    
    
    if __name__ == '__main__':
    
        app = QApplication(sys.argv)
        window = Window()
        window.show()
        sys.exit(app.exec_())

在尝试此示例之前，请运行以下命令( install pyOpenGL)：pip install pyOpenGL