python - QQuickFrameBufferObject 导致 PySide2 崩溃

Question

我正在尝试创建一个简单QQuickFrameBufferObject的以便在 Qt Quick 中呈现一些自定义的 opengl 纹理。所以我决定用 PySide2 来测试一下。这是一个简单的实现：

from PySide2.QtQuick import QQuickFramebufferObject
from PySide2.QtGui import QOpenGLFramebufferObjectFormat, QOpenGLFramebufferObject
from PySide2.QtCore import QSize, Qt

class FboRenderer(QQuickFramebufferObject.Renderer):
    def __init__(self, parent=None):
        super().__init__(parent)
        print("Creating renderer")

    def createFrameBufferObject(self, size):
        format = QOpenGLFramebufferObjectFormat()
        format.setAttachment(QOpenGLFramebufferObject.Depth)
        return QOpenGLFramebufferObject(size, format)

    def synchronize(self, item):
        print("Synchronizing")

    def render(self):
        print("Rendering")

class OpenGLCanvas(QQuickFramebufferObject):
    def __init__(self, parent=None):
        super().__init__(parent)

    def createRenderer(self):
        return FboRenderer()

然后在 QML 中使用它，我使用了：

    qmlRegisterType(OpenGLCanvas,"OpenGLCanvas", 1, 0, "OpenGLCanvas")

import QtQuick 2.12
import QtQuick.Window 2.12
import OpenGLCanvas 1.0

Window{
    id: win
    visible: true

    OpenGLCanvas{
        anchors.fill: parent
    }
}

现在应用程序运行并显示“正在创建渲染器”，但几秒钟后它崩溃了。

标签： pythonqtqt5qtquick2pyside2

Answer 1

问题是这FboRenderer()是一个将立即销毁的局部变量，因此它也会销毁导致分段错误的 C++ 对象，因为访问了未保留的内存。

另一方面，你有一个错字，createFrameBufferObject因为它必须是createFramebufferObject，这也揭示了一个类似于初始错误的错误，为此解决方案是相似的。

class FboRenderer(QQuickFramebufferObject.Renderer):
    def __init__(self):
        super().__init__()
        print("Creating renderer")
        self._fbos = []

    def createFramebufferObject(self, size):
        fmt = QOpenGLFramebufferObjectFormat()
        fmt.setAttachment(QOpenGLFramebufferObject.Depth)
        fbo = QOpenGLFramebufferObject(size, fmt)
        self._fbos.append(fbo)
        return fbo

    def synchronize(self, item):
        print("Synchronizing")

    def render(self):
        print("Rendering")


class OpenGLCanvas(QQuickFramebufferObject):
    def __init__(self, parent=None):
        super().__init__(parent)
        self._renderer = None

    def createRenderer(self):
        if self._renderer is None:
            self.renderer = FboRenderer()
        return self.renderer