Laszlo, Thanks for your reply.
I was able to overcome this problem a couple of weeks ago. Your suggestion was exactly what I have followed. My biggest problem right now is definitely the lack of blend equation support. Can you please help? Thank you! Best regards, Nuno > On 8 May 2024, at 16:41, Laszlo Agocs <laszlo.ag...@qt.io> wrote: > > Hi, > > Passing 0 as a renderbuffer object name is not going to work. Try using > https://doc.qt.io/qt-6/qquickrendertarget.html#fromOpenGLTexture with the > texture that is used as the color attachment of your OpenGL framebuffer > object. (actually that FBO is not useful in Qt 6 as one will be created > internally as needed) > > Best regards, > Laszlo > > From: Interest <interest-boun...@qt-project.org> on behalf of Nuno Santos via > Interest <interest@qt-project.org> > Sent: Tuesday, April 16, 2024 4:21 PM > To: interestqt-project. org <interest@qt-project.org> > Subject: [Interest] Porting Qt5 OpenGL app to Qt6 - QQuickRenderTarget and > OpenGL frame buffer object > > Hi, > > I have an application that was heavily written on top of OpenGL. Right now I > want to port it to Qt 6 with the minimum effort trying to stick to the OpenGL > backend until I get the grip on the new things of Qt 6 Graphics API > abstraction. > > I used to do this in order to assign a target FBO to a QuickWindow: > > _quickWindow->setRenderTarget(_fboRender); > > This is no longer possible and it requires a QQuickRenderTarget to be created > and I seem to have three options: > > (since 6.2) QQuickRenderTarget fromOpenGLRenderBuffer(uint renderbufferId, > const QSize &pixelSize, int sampleCount = 1) > (since 6.4) QQuickRenderTarget fromOpenGLTexture(uint textureId, uint > format, const QSize &pixelSize, int sampleCount = 1) > QQuickRenderTarget fromOpenGLTexture(uint textureId, const QSize > &pixelSize, int sampleCount = 1) > > I’m trying this: > > _renderTarget = QQuickRenderTarget::fromOpenGLRenderBuffer(0, > QSize(_renderResolution.width(), _renderResolution.height())); > _quickWindow->setRenderTarget(_renderTarget); > > But nothing appears on the screen and I get a warning: > > QQuickWindow: No render target (neither swapchain nor custom target was > provided) > > Can anyone tell me what am I failing here? > > Any ideas suggestions are very welcome. > > With my best regards, > > Nuno > _______________________________________________ > Interest mailing list > Interest@qt-project.org <mailto:Interest@qt-project.org> > https://lists.qt-project.org/listinfo/interest
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