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Qt3D: Antialising in deferred rendering
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Hello all,
I am writing an application in which I want to use deferred rendering.
When using forward rendering, we can see that multisample antialiasing (MSAA) is enabled.
However, I am trying to have MSAA in my deferred rendering application and I am not able to do this.As my framegraph is pretty complex (see below), I just show important parts of my code where I have tried to enable MSAA.
- First of all, I have followed the answer of this topic before creating the Qt3DWindow.
- Then, in my framegraph I have enabled MSAA by adding a QMultiSampleAntiAliasing in the QRenderStateSet
auto globalRenderStateSet = new Qt3DRender::QRenderStateSet(viewport); auto depthTestState = new Qt3DRender::QDepthTest(); depthTestState -> setDepthFunction(Qt3DRender::QDepthTest::LessOrEqual); auto msaaState = new Qt3DRender::QMultiSampleAntiAliasing(); globalRenderStateSet -> addRenderState(depthTestState); globalRenderStateSet -> addRenderState(msaaState);- I have a GBuffer (QRenderTarget) in which I use only QTexture2DMultisample objects, all with the same amount of samples (the same as in the QSurfaceFormat of the first point as well).
_textures = new Qt3DRender::QTexture2DMultisample*[attachmentsCount]; _attachments = new Qt3DRender::QRenderTargetOutput*[attachmentsCount]; for (int attachmentIndex = 0 ; attachmentIndex < attachmentsCount ; attachmentIndex++) { const TargetOutputParameters& parameter = parameters[attachmentIndex]; _attachments[attachmentIndex] = new Qt3DRender::QRenderTargetOutput(this); _textures[attachmentIndex] = new Qt3DRender::QTexture2DMultisample(); _textures[attachmentIndex] -> setFormat(parameter.format()); _textures[attachmentIndex] -> setWidth(TextureWidth); _textures[attachmentIndex] -> setHeight(TextureHeight); _textures[attachmentIndex] -> setGenerateMipMaps(false); _textures[attachmentIndex] -> setWrapMode(Qt3DRender::QTextureWrapMode(Qt3DRender::QTextureWrapMode::ClampToEdge)); _textures[attachmentIndex] -> setMinificationFilter(Qt3DRender::QAbstractTexture::Linear); _textures[attachmentIndex] -> setMagnificationFilter(Qt3DRender::QAbstractTexture::Linear); _textures[attachmentIndex] -> setSamples(8); _attachments[attachmentIndex] -> setTexture(_textures[attachmentIndex]); _attachments[attachmentIndex] -> setAttachmentPoint(parameter.attachmentPoint()); _attachments[attachmentIndex] -> setObjectName(parameter.name()); addOutput(_attachments[attachmentIndex]); }- I have another QRenderTarget (MSAADestinationRenderTarget) in which I only have QTexture2D objects. I perform a QBlitFramebuffer to copy the MSAA color texture into the single-sample render target.
auto noDraw = new Qt3DRender::QNoDraw(cameraSelector); auto sceneBlitColorFBOs = new Qt3DRender::QBlitFramebuffer(noDraw); _gBuffer = new GBuffer(); _msaaRenderTarget = new MSAADestinationRenderTarget(); auto msaaRenderTargetSelector = new Qt3DRender::QRenderTargetSelector(cameraSelector); msaaRenderTargetSelector -> setTarget(_msaaRenderTarget); sceneBlitColorFBOs -> setSource(_gBuffer); sceneBlitColorFBOs -> setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::Color0); sceneBlitColorFBOs -> setSourceRect(QRect(0, 0, _view -> width(), _view->height())); sceneBlitColorFBOs -> setDestination(_msaaRenderTarget); sceneBlitColorFBOs -> setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::Color0); sceneBlitColorFBOs -> setDestinationRect(QRect(0, 0, _view -> width(), _view->height()));All of this seems to be working well as I can display this texture on a quad and see the scene, move the camera, etc. But, it is not antialiased.
Am I missing something?
Thank you for any help.Denis
Framegraph:
