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| author | Laszlo Agocs <laszlo.agocs@qt.io> | 2022-08-04 12:35:29 +0200 |
|---|---|---|
| committer | Qt Cherry-pick Bot <cherrypick_bot@qt-project.org> | 2022-08-04 23:14:21 +0000 |
| commit | f423ed8e4e6694a00982947dcd8fc0302dd8de3d (patch) | |
| tree | 3f6e35190da6b1c60b0358600a2e053c92addbed /src/quick | |
| parent | 438a114eb8e575f670ef60b689a9b08da59c052f (diff) | |
Clarify QSGRenderNode docs
It talks about connecting to beforeRendering, but that approach predates
6.0 where in the end QSGRenderNode got another overrideable function,
prepare(). Mention both.
Change-Id: I9e6fba6df38569917da3b3d318f9eb1894cceb9a
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
(cherry picked from commit a3f0ae13a7e9530d150830c371829912bbf285d6)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
Diffstat (limited to 'src/quick')
| -rw-r--r-- | src/quick/scenegraph/coreapi/qsgrendernode.cpp | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/src/quick/scenegraph/coreapi/qsgrendernode.cpp b/src/quick/scenegraph/coreapi/qsgrendernode.cpp index 855eba8506..bbdfff0f7c 100644 --- a/src/quick/scenegraph/coreapi/qsgrendernode.cpp +++ b/src/quick/scenegraph/coreapi/qsgrendernode.cpp @@ -239,13 +239,14 @@ void QSGRenderNode::prepare() Assume nothing about the pipelines and dynamic states bound on the command list/buffer when this function is called. - With some graphics APIs it can be necessary to also connect to the - QQuickWindow::beforeRendering() signal, because that is emitted before - recording the beginning of a renderpass on the command buffer - (vkCmdBeginRenderPass with Vulkan, or starting to encode via - MTLRenderCommandEncoder in case of Metal). Recording copy operations cannot - be done inside render() with such APIs. Rather, do it in the slot connected - (with DirectConnection) to the beforeRendering signal. + With some graphics APIs it can be necessary to reimplement prepare() in + addition, or alternatively connect to the QQuickWindow::beforeRendering() + signal. These are called/emitted before recording the beginning of a + renderpass on the command buffer (vkCmdBeginRenderPass with Vulkan, or + starting to encode via MTLRenderCommandEncoder in case of Metal. Recording + copy operations cannot be done inside render() with such APIs. Rather, do + such operations either in prepare() or the slot connected to + beforeRendering (with DirectConnection). \sa QSGRendererInterface, QQuickWindow::rendererInterface() */ |