Jeff Leger jackohound
Certain use cases (e.g., side-by-side VR rendering) use multiview and render to distinct regions of the framebuffer for each view. On some implementations, there may be a performance benefit for providing per-view render areas to the implementation. Such per-view render areas can be used by the implementation to reduce the pixels that are affected by attachment load, store, and multisample resolve operations.
The extension enables a multiview render pass instance to define per-view render areas. For each view of a multiview render pass instance, only those pixels in the per-view render area are affected by load, store and resolve operations.
1) Do the per-view
renderAreas interact with
RESOLVED: There is no change.
The granularity returned by vkGetRenderAreaGranularity also applies to
2) How does this extension interact with
VK_QCOM_render_pass_transform is enabled, the
application provides render area in non-rotated coordinates which is rotated
by the implementation to the rotated coordinate system.
When this extension is used in combination with
VK_QCOM_render_pass_transform, then the
is rotated by the implementation.
The per-view render areas are not rotated.
3) How does this extension interact with
RESOLVED: There is no direct interaction. The per-view viewports and the per-view renderAreas are orthogonal features.
4) When a per-view
renderArea is specified, must multiview rendering
for each view of a multiview render pass be contained within the per-view
RESOLVED: Yes, and the
help here since it provides per-view scissors.
RESOLVED: The per-view
renderArea effectively overrides the
renderArea defines the regions of the attachments that
are effected by load, store, and multisample resolve operations.
A valid implementation could ignore the per-renderpass
However, as an aid to the implementation, the application must set the
renderArea to an area that is at least as large as the
union of all the per-view render areas.
Pixels that are within the per-renderpass
renderArea but not within
any per-view render area must not be affected by load, store, or multisample
For more information, see the Vulkan Specification
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