Wumpf 988716943f

Zero init textures (#1688) ...

* Added tests for texture zero init
sadly, they are typically passing even if texture zero init isn't doing its job
However, they form nice isolated examples for testing out texture initialization
It could be possible to dirty texture memory prior to ensure zero init did the job

* texture init tracker

* tracking texture init requirements for bind group, transfer and rendertarget

* texture clears for texture init
* queue submit
* write_texture

* Enforce presence of either render target or copy_dst flag

* clear render targets also with using buffer copies
enforce COPY_DST usage now on all textures

* adjust ImageSubresourceRange.layer_range calculation for 3D textures

init_tracker has now a `discard` function to get single data points back to uninitialized

use new standardized partition_point function

* track init state for discarded textures from renderpasses

missing:
* init on the fly if discarded is found within command buffer
* handle discarding only stencil or only depth

* added tests for zero init after discard

* tracking discarded surfaces now in separate struct, piping all inits through utility function
allows to resolve discard/init_action interactions

* Move various memory init code to separate mod
CommandBufferTextureMemoryActions is now fully encapsulated

* implemented discard init fixups for everything but renderpass

* render passes also cause now discard fixups

* fixup_discarded_surfaces takes now an iterator instead of Drain

* Add memory init test for discarding depth targets

* handle divergently discarded depth/stencil target

* comment & clippy fixes

* fix collect_zero_buffer_copies_for_clear_texture yielding block breaking copies

* [pr feedback] minor cleanup in zero_init_texture_after_discard, `use` hygenie

* [pr feedback] fix bug in ImageSubresourceRange range utils

* [pr feedback] fix texture tracker check, bundle transition_texture on init, cleanups

* Implemented drop for InitTrackerDrain

* remove incorrect comment about extents in add_pass_texture_init_actions

* Fix unit test & clippy issues in init_tracker

2021-10-28 09:15:53 -04:00

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