在 qt5 的 qtquick 2.0 中渲染自定义 opengl [英] Rendering custom opengl in qt5's qtquick 2.0

问题描述

我正在寻找一种方法来在 qtquick 2.0 项目中呈现我的自定义 opengl 调用.给你一些背景信息:我有一个使用 opengl 进行渲染的 C++ 3d 引擎.目标是让它在 qtquick 2.0 UI 中呈现.

I'm looking for a way to render my custom opengl calls inside a qtquick 2.0 item. To give you some context: I have a C++ 3d engine that uses opengl for rendering. The goal is to have it rendering inside a qtquick 2.0 UI.

我发现在 qt 5.0 (qtquick 2.0) 之前，您将使用 QtGlWidget 并将其嵌入到 QDeclarativeView 中.我发现的另一种方法是使用 QtDeclarativeItem 并覆盖 void QDeclarativeItem::paint(QPainter *p, const QStyleOptionGraphicsItem *o, QWidget *w) 方法.

What I found out is that pre qt 5.0 (qtquick 2.0) you would use a QtGlWidget and embed that into the QDeclarativeView. Another way I found would be to use a QtDeclarativeItem and override the void QDeclarativeItem::paint(QPainter *p, const QStyleOptionGraphicsItem *o, QWidget *w) method.

据我所知，这不再可能，因为 QtQuick 2.0 使用基于 OpenGl 的新渲染器.因此，它似乎不像重写一个绘制方法那么容易.

As I understand it this is not possible anymore as QtQuick 2.0 uses a new renderer which is based on OpenGl. It is therefore as it seems not as easy as overriding a paint method.

有人知道我将如何实现允许渲染我的 opengl 调用的 QQuickItem 吗?

Does anybody know how I would go about implementing a QQuickItem that allows rendering of my opengl calls?

推荐答案

您可以执行以下两项操作之一.通过使用 QQuickWindow::beforeRendering 或 QQuickWindow::afterRendering 信号挂钩，将您的内容渲染为纹理或在场景图的 OpenGL 上下文中渲染.

You can do one of two things. Either render your content into a texture or render in the OpenGL context of the scene graph by hooking using the QQuickWindow::beforeRendering or QQuickWindow::afterRendering signals.

可以在此处找到有关如何使用 FBO 和纹理的示例:http://doc.qt.io/qt-5/qtquick-scenegraph-textureinsgnode-example.html

An example on how to use FBO and texture can be found here: http://doc.qt.io/qt-5/qtquick-scenegraph-textureinsgnode-example.html

可以在此处找到有关如何直接渲染到场景图的 OpenGL 上下文的示例:http://doc.qt.io/qt-5/qtquick-scenegraph-openglunderqml-example.html

An example on how to render directly to the OpenGL context of the scene graph can be found here: http://doc.qt.io/qt-5/qtquick-scenegraph-openglunderqml-example.html

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