Cannot load Qt5Compat.GraphicalEffects module in Qt 6.3

Question

I'm using the Qt 5 Core Compatibility APIs in my Qt 6 applications. In particular, I need the QtGraphicalEffects module in my Qt Quick Scene.

This is the full code of my main.qml file:

import QtQuick
import QtQuick.Window
import Qt5Compat.GraphicalEffects

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Item {
        width: 300
        height: 300

        Image {
            id: bug
            source: "images/bug.jpg"
            sourceSize: Qt.size(parent.width, parent.height)
            smooth: true
            visible: false
        }

        Image {
            id: mask
            source: "images/butterfly.png"
            sourceSize: Qt.size(parent.width, parent.height)
            smooth: true
            visible: false
        }

        OpacityMask {
            anchors.fill: bug
            source: bug
            maskSource: mask
        }
    }
}

This runs fine with Qt 6.2.4 (installed via the Qt Maintenance Tool). However with Qt 6.3.0, I get the following error:

QQmlApplicationEngine failed to load component qrc:/main.qml:3:1: Cannot load library C:\Qt\6.3.0\msvc2019_64\qml\Qt5Compat\GraphicalEffects\qtgraphicaleffectsplugind.dll: The specified procedure could not be found.

I verified that the file C:\Qt\6.3.0\msvc2019_64\qml\Qt5Compat\GraphicalEffects\qtgraphicaleffectsplugind.dll actually exists and made sure that the Qt 5 Compatibility module is installed for my Qt version. I've also tried to upgrade to the Qt 6.4.0 alpha release (again making sure that the compatibility module is installed) and with that I get a slightly different error:

QQmlApplicationEngine failed to load component qrc:/main.qml:31:9: Type OpacityMask unavailable qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/OpacityMask.qml:41:1: Cannot load library C:\Qt\6.4.0\msvc2019_64\qml\Qt5Compat\GraphicalEffects\private\qtgraphicaleffectsprivateplugind.dll: The specified module could not be found.

What could be the cause of this issue? Has anything changed since Qt 6.3.0 regarding the compatibility module?

Answer 1

As this thread said, You need install Shader tools module after Qt 6.4. Install it by MaintenanceTool, then it will be ok.