-
Show log
Commit
-
Hash : 20e7bbb7
Author :
Date : 2022-03-18T17:03:18
Vulkan: Fix invalidate of attachments with emulated format Some image formats may be emulated such that the emulated format has more channels than the original. ANGLE clears the image once so that these extra channels contain valid values, and carefully ensures they are never modified. For swapchain images with such formats, as they are automatically invalidated at the end of the frame, a workaroud was added to make sure they are re-cleared in the beginning of the next frame. This however doesn't fix the issue of glInvalidateFramebuffer resulting in the contents of attachments with such formats to be discarded (even if the following render pass clears it, the contents are invalid in between). This change instead makes sure invalidate of images with emulated formats that have extra channels are handled appropriately: - On IMR hardware, the invalidate is dropped altogether as it provides little to no benefit. - On TBR hardware, a clear is automatically staged on the invalidated image. The latter replaces the workaround that was added to make the following render pass use loadOp=CLEAR, by adding a clear that's respected regardless of what the future usage is. This change also paves the way for a future change where the invalidate of color attachments is tracked in render passes similarly to how depth/stencil currently is. With this change, the image is no longer in an inconsistent state where its contents are considered invalid, even though some channels are meant to remain valid. Bug: angleproject:6860 Change-Id: Iec5b4854dfbe3a0bf93cd5aa82c19fe116065744 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3536389 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
