Did https://codereview.qt-project.org/#/c/141786/ help improve things?
This should enable all such texture (or buffer) updates to be picked up
on the next frame and uploaded to GL as the render commands are being
processed that frame.
Cheers,
Sean
On 18/11/2015 22:18, Jørn Bersvendsen wrote:
I have a QImage which needs to be drawn *synchronously* in 2D
(QQuickPaintedItem) and 3D (rendered as texture on a quad). The
contents of the QImage changes rapidly (like playing a movie).
Following the Qt3D examples and source code, I'm currently doing the
following:
1. Subclass Qt3DRender::QAbstractTextureImage to represent my texture.
My subclass has a Qt3DRender::TexImageDataPtr member that I update
with the data from my QImage. So far so good.
2. Implement Qt3DRender::QAbstractTextureImage::dataFunctor(), which
(through a functor) returns my Qt3DRender::TexImageDataPtr member.
This works.
The problem is that the texture loading is asynchronous, and the 3D
version of the QImage lags significantly behind the 2D version, and
has pretty low update rate. There seem to be two asynchronous parts
contributing to this
1. The Qt3DRender::Render::LoadTextureDataJob, running in a separate
thread, checks for updates in my functor, and calls
Qt3DRender::Render::Texture::requestTextureDataUpdate, which just
marks it as requiring data upload
2. The Qt3DRender::QRenderAspect then comes a long (in the next frame,
presumably), and uploads the new data to the GPU texture.
Is there a way for me to synchronously upload data to a Qt3D texture?
(Forum post
https://forum.qt.io/topic/60703/synchronous-update-of-qt3d-texture-data)
Thanks for your advice,
Jørn Bersvendsen
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