QML Canvas3D multisampling
Unsolved
QML and Qt Quick
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How do I enable multisampling and set the number of multisampling samples for a Canvas3D's GL context?
Stuff I've found so far:
Canvas3DContextAttributes.antialiaswhich however is documented as enabling an "antialiasing buffer" which I have never heard of. They probably meant to say "multisampling buffer" there? Also I found no way to specify sample count with that option.- "setting a QSurfaceFormat with samples greater than 0 using
QQuickWindow::setFormat()". But I think this only applies to the window's GL context, and not to the Canvas3D's GL context.- If I were to use the
Canvas3D.RenderTargetBackgroundorCanvas3D.RenderTargetForegroundrender target, then the window's multisampling buffer would be used for the Canvas3D. But I useCanvas3D.RenderTargetOffscreenBuffer.
- If I were to use the
glEnable(GL_MULTISAMPLE);but I think that only works after we've created a context that supports multisampling.- For a QQuickFramebufferObject I can set
QOpenGLFramebufferObjectFormat.setSamples(4)but I'm using Canvas3D, not QQFBO
Also, I know that my target device supports multisampling, but I don't know if it supports the extensions
GL_EXT_framebuffer_multisampleandGL_EXT_framebuffer_blitmentioned here. Will that be a problem, considering my render target isCanvas3D.RenderTargetOffscreenBuffer(i.e. a FBO)?
