QQuickFrameBufferObject导致PySide2崩溃

问题描述 投票:0回答:1

我正在尝试创建一个简单的QQuickFrameBufferObject,以便在Qt Quick中渲染一些自定义的opengl纹理。因此,我决定使用PySide2进行测试。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()

然后在我使用的QML中使用它:

    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
    }
}

现在该应用程序运行并显示“正在创建渲染器”,但随后几秒钟后崩溃。

python qt qt5 qtquick2 pyside2
1个回答
0
投票

问题在于,FboRenderer()是一个局部变量,将被立即销毁,因此,由于访问了未保留的内存,它也会销毁C ++对象,从而导致分段错误

另一方面,您在createFrameBufferObject中有一个类型,因为它必须为createFramebufferObject,这也显示出与初始错误类似的错误,为此,解决方案也与此相似。

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
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