As a side-effect this allows empty viewports which need special handling
in Vulkan because it is not allowed to set width to 0 (but ok to set
height to 0).
Validation tests are updated to cover the new validation checks.
Most of the viewport end2end tests are rewritten because they didn't
pass the new validation.
A new end2end test is added to test various kinds of empty viewports to
cover the extra logic in the Vulkan backend.
Bug: dawn:542
Change-Id: I8bb25612eeed04162a6b942983167eacab3a1906
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29681
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
This is to match the upstream WebGPU spec.
Bug: dawn:445
Change-Id: I1a511ed9a2a04c7b95368ce724d69c128158f097
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29360
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
The upstream Tint issues have been fixed and Tint has rolled. This CL
re-enables the disabled test.
Bug: tint:263
Change-Id: Id8a73e198c15c74c55dc9b26603f4a3850d995b3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29680
Commit-Queue: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This is to match the upstream WebGPU spec.
Bug: dawn:445
Change-Id: I4246487247fdba8d90a119c1970d6d4df3235835
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29361
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
This can be used to simplify some logic in Blink.
Bug: dawn:445
Change-Id: I9859c51bc95f564847035533426675188eb8ef99
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29362
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
This is a reland of b04a92f01be0e7dc2faf91e0f6f974f990e8b2f2
with the deletion of a duplicate exported function in dawn_wire that
was causing a compilation failure on Windows.
Original change's description:
> Add a per-thread proc table using thread local storage
>
> In situations where both dawn_wire and dawn_native are used on separate
> threads (Chrome with --single-process or --in-process-gpu), it's
> desirable to have a per-thread proc table so that the WebGPU C++ API can
> still be used. This eliminates classes of bugs with manual
> reference/release errors.
>
> This also changes many of the GetProcs functions to return const
> references to the static proc tables known at compile time, instead of a
> copy.
>
> Bug: none
> Change-Id: I8775bb715b312dd9476a1903fbd797d4b1302614
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29240
> Reviewed-by: Stephen White <senorblanco@chromium.org>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Austin Eng <enga@chromium.org>
Bug: none
Change-Id: Id90e5372132cd93a2f8631c8185d0e71b01bc1af
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29443
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
This reverts commit b04a92f01be0e7dc2faf91e0f6f974f990e8b2f2.
Reason for revert: Build failed on win-archive-dbg; see:
https://chromium-review.googlesource.com/c/chromium/src/+/2450792
Original change's description:
> Add a per-thread proc table using thread local storage
>
> In situations where both dawn_wire and dawn_native are used on separate
> threads (Chrome with --single-process or --in-process-gpu), it's
> desirable to have a per-thread proc table so that the WebGPU C++ API can
> still be used. This eliminates classes of bugs with manual
> reference/release errors.
>
> This also changes many of the GetProcs functions to return const
> references to the static proc tables known at compile time, instead of a
> copy.
>
> Bug: none
> Change-Id: I8775bb715b312dd9476a1903fbd797d4b1302614
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29240
> Reviewed-by: Stephen White <senorblanco@chromium.org>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Austin Eng <enga@chromium.org>
TBR=cwallez@chromium.org,senorblanco@chromium.org,enga@chromium.org
Change-Id: I4587b457b7b2dd5d3c7457065bf4e77b95af59d7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29442
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
In situations where both dawn_wire and dawn_native are used on separate
threads (Chrome with --single-process or --in-process-gpu), it's
desirable to have a per-thread proc table so that the WebGPU C++ API can
still be used. This eliminates classes of bugs with manual
reference/release errors.
This also changes many of the GetProcs functions to return const
references to the static proc tables known at compile time, instead of a
copy.
Bug: none
Change-Id: I8775bb715b312dd9476a1903fbd797d4b1302614
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29240
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
In the WebGPU specification, validation errors for mapAsync take
precedence over the early-unmap or early-destroy promise resolution.
Change the client to wait for the mapAsync status from the server before
sending the cancelation through the callback. If the server sends back
an error, then it takes precedence over the client-side status.
Also adds tests for the updated semantic.
Bug: dawn:445
Change-Id: I7bf1d8bbb3cb62d73ab19ecdf0aad2963e854964
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29300
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
ValidateOrSetAttachmentSize() was asserting that
textureSize.width >> attachment->GetBaseMipLevel() is nonzero.
This is not true for rectangular textures, where the smaller dimension
may hit the lower bound and must be be clamped at 1.
Fixed by calling GetMipLevelVirtualSize() which performs the clamp.
Added a test which exercises rectangular mipmapped textures as color
attachments. This required a few fixes to the test harness, which had
the same bug as that fixed in the code (assumes (width >> size) > 0).
Bug: dawn:535
Change-Id: Idde3b68feb14d8a241803d09a094b059d9935d91
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29261
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Stephen White <senorblanco@chromium.org>
Adds validation to ensure clear colors do not exceed 2^24 and a
corresponding unit test. Also removes intermediate float conversions
that are no longer necessary.
Bug: dawn:525
Change-Id: I020b98de85384c20da51158de79eab87f60dcf6d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29040
Commit-Queue: Brandon Jones <brandon1.jones@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
For sampling, check that formats without 4 components sample them as
(0, 0, 0, 1) instead. For rendering, check that extra components output
by the shader are ignored.
Bug: None
Change-Id: Ib49fcaa58e984d821667e992d3ddb1bb093bdba0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29061
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This has been fixed by the layout transition fixes. The dedicated
memory bug doesn't seem relevant at this time.
Bug: dawn:200, dawn:206
Change-Id: I953a20850881f64f5ff5ddbede9aed3a835d22da
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29123
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Fixed in the roll of Swiftshader.
Bug: dawn:483
Change-Id: I8baad1d8d61e7b99c01dc27f929da830ca30c8d3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29081
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This will prevent mixing it up with other serial types in the future.
Bug: dawn:442
Change-Id: I74e964708acc62eb0f33127cc48f1b9a7b171d11
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28923
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
This will prevent mixing it up with other serial types in the future.
Bug: dawn:442
Change-Id: I32f356c62f19ef29f3bf51c19873369fb817bb16
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28960
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
This is in preparation for follow-up CLs that will use typed integers
for the various serial types.
Bug: dawn:442
Change-Id: I5296546e96acd6ac9f7a0bfc46dc7eba40cb3cf5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28921
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This patch adds two new buffer map async status "destroyed before
callback" and "unmapped before callback" to replace the status "unknown"
so that the developers can get more details when meeting such errors in
the call of buffer mapAsync.
Note that this patch still preserves "unknown" as it is still being used
in Chromium.
BUG=dawn:533
TEST=dawn_unittests
Change-Id: I12deefb49311ea6adea72c24e4e40797dd7eb4a1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28883
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
In B2T, T2B and T2T copies, copySize has 0 in width, height or depth
will trigger errors in D3D12 backend.
This patch bypass the command record step for noop copy. But all
validation rules still applies to the copy.
BUG=dawn:255
Change-Id: I4d01cef2e3c1f78440014c2c6ac63a48310d99af
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28521
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Returning the layouts from an export operation and then using
them in a subsequent import operation allows the import to preserve
the texture contents.
This fixes Vukan image wrapping on some AMD/NVIDIA devices.
Bug: dawn:200
Change-Id: Icbb6e759856d410bb69724b9f439bc3088756d19
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28380
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Change dawn.json to reflect changes in the WebGPU IDL. Also fixes any
conversion issues in Dawn.
Bug: dawn:525
Change-Id: Ifb46329f073bcf31d43342f20f4819eac061d5a1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28400
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Brandon Jones <brandon1.jones@intel.com>
This reverts commit 52a588f3c9ba374630158cc045dfa311ed6a7584.
Reason for revert: added a workaround to filter out messages.
Original change's description:
> Disable debug layer logger
>
> This logger is producing too much output on Windows and causing
> Chromium's gtest harness to kill the tests.
>
> Tbr=cwallez@chromium.org
> No-Try: true
> Bug: chromium:1130483
> Change-Id: I1990bc800bbb7eda62901d14f656375c30fbeef2
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28740
> Reviewed-by: Austin Eng <enga@chromium.org>
> Commit-Queue: Austin Eng <enga@chromium.org>
TBR=cwallez@chromium.org,enga@chromium.org
Bug: chromium:1130483
Change-Id: Ifeee73838a957f619dfdb977f21585fe8abacc3b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28760
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Instead of calling validation functions directly in
PipelineLayoutBase::CreateDefault, use ValidateBGLDesc and
ValidatePipelineLayoutDesc.
Also makes the visibility of the default layout match the aggregation as
in the WebGPU spec.
Also makes refcounting of BGLs a bit less manual at the bottom of
CreateDefault.
Also adds tests for minBufferBindingSize and visiblity aggregation in
the default layout computations.
Bug: dawn:527
Change-Id: I6bbd5f3de8b235dddf6cbd2bedfd34a094fcb277
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28560
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
This logger is producing too much output on Windows and causing
Chromium's gtest harness to kill the tests.
Tbr=cwallez@chromium.org
No-Try: true
Bug: chromium:1130483
Change-Id: I1990bc800bbb7eda62901d14f656375c30fbeef2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28740
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
It isn't in the upstream WebGPU spec and completely unimplemented in
Dawn.
Bug: dawn:527
Change-Id: I2023c7b1de2a9fa50d26ab1678b7ef7e32c64af6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28500
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
D3D debug layer uses the descriptor size (width) to
validate CBV bounds when directly allocating UBOs.
This causes validation failure when the buffer size
is misaligned (ie. not a multiple of 256B) even
through the underlying resource heap size is always
64KB aligned.
This change always aligns the buffer size to be 256B
to avoid such validation error should sub-allocation
fail.
BUG=dawn:506
Change-Id: Ic9072934cac65cfd25d0e2a20cb364bd3ca88e3b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/26820
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
In addition to adding the pass running logic, how shaders are stored
in the ShaderModule is changed, so that cached shader that was used to
create the ShaderModule is differentiated from the
modified/intermediate shader that is actually being passed to
SPIRV-Cross.
Also rolling SPIRV-Tools to pick up a fix for a bug I discovered in
the RBA pass implementation.
Roll third_party/SPIRV-Tools/ fd05605be..34ef0c3fd (25 commits)
fd05605bef..34ef0c3fdc
$ git log fd05605be..34ef0c3fd --date=short --no-merges --format='%ad %ae %s'
2020-09-16 rharrison Fix missed modification flagging (#3814)
2020-09-16 andreperezmaselco.developer spirv-fuzz: Use an irrelevant id for the unused components (#3810)
2020-09-16 stefanomil spirv-fuzz: Improvements to random number generation (#3809)
2020-09-16 greg Add buffer oob check to bindless instrumentation (#3800)
2020-09-16 vasniktel spirv-fuzz: Remove CanFindOrCreateZeroConstant (#3807)
2020-09-15 andreperezmaselco.developer spirv-fuzz: Add bit instruction synonym transformation (#3775)
2020-09-16 vasniktel spirv-fuzz: Skip unreachable blocks (#3729)
2020-09-15 afdx Fix build errors (#3804)
2020-09-15 vasniktel spirv-fuzz: Handle invalid ids in fact manager (#3742)
2020-09-15 vasniktel spirv-fuzz: Support memory instructions MoveInstructionDown (#3700)
2020-09-15 stefanomil spirv-fuzz: Pass submanagers to other submanagers when necessary (#3796)
2020-09-15 stefanomil spirv-fuzz: Transformation to flatten conditional branch (#3667)
2020-09-14 46493288+sfricke-samsung spirv-val: Add BaseInstance, BaseVertex, DrawIndex, and ViewIndex (#3782)
2020-09-14 dnovillo Properly mark IR changed if instruction folder creates more than one constant. (#3799)
2020-09-11 afdx Add missing file to BUILD.gn (#3798)
2020-09-11 antonikarp spirv-fuzz: Add TransformationDuplicateRegionWithSelection (#3773)
2020-09-11 afdx spirv-reduce: Support reducing a specific function (#3774)
2020-09-10 afdx spirv-reduce: Refactoring (#3793)
2020-09-10 afdx Favour 'integrity' over 'coherence' as a replacement for 'sanity'. (#3619)
2020-09-10 antonikarp spirv-fuzz: Fix header guards in transformations/fuzzer passes (#3784)
2020-09-10 paulthomson spirv-fuzz: Add SPIRV_FUZZ_PROTOC_COMMAND (#3789)
2020-09-10 paulthomson Add missing include (#3788)
2020-09-09 paulthomson Improve spirv-fuzz CMake code (#3781)
2020-09-08 stevenperron Allow SPV_KHR_8bit_storage extension. (#3780)
2020-09-08 stefanomil spirv-opt: Add function to compute nesting depth of a block (#3771)
Created with:
roll-dep third_party/SPIRV-Tools
BUG=dawn:523,dawn:480
Change-Id: I1f424f5fe6d67999412f286e831ea2ea26372b9e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28540
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
- Reomve buffer initialization at buffer creation in end2end tests,
and implement lazy initialization when resolving queries to buffer
on D3D12 backend.
- Add buffer lazy zero init tests for resolveQuerySet on D3D12.
- For other backends, buffer lazy initialization will be added when
its resolve method is implemented.
Bug: dawn:434
Change-Id: Ib91c004b37ca912135a1c2fbb53bbd16e2d4eac6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28461
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Hao Li <hao.x.li@intel.com>
Also adds validation tests that reflection data is correctly computed by
entryPoint, and end2end tests that using a shader module with multiple
entryPoints works correctly.
Bug: dawn:216
Change-Id: Id2936bb220d4480872a68624996e4c42452a507d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28244
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This patch fixes a crash issue in both D3D12 and Vulkan backends.
Previously on D3D12 and Vulkan before a compute pass we transitioned
the states of all the resources used in the pass, and before each
dispatch call we only checked if the states of the storage buffers,
read-only storage textures and write-only storage textures need to
be transitioned. This behavior causes two issues:
1. In a compute pass a buffer or texture can be used as both read-only
and writable usages in different dispatch calls (e.g. as storage
buffer in the first dispatch, and as the uniform buffer in the next
dispatch), while this is invalid state combination on D3D12 and isn't
allowed by D3D12 validation layer.
2. In the above case, the state of the buffer is not transitioned into
UNIFORM, which does not match the required state in the next dispatch.
This patch fixes this issue by transitioning all the states in the
current bind group before each dispatch() instead of the beginning
of the compute pass.
BUG=dawn:522
TEST=dawn_end2end_tests
Change-Id: Ibeb6c41dc493ee1068b43bd89ed5a15f2331ef75
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/27942
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Also moves BindingNumber, BindGroupIndex, and BindingIndex to
IntegerTypes.h. Future TypedIntegers should be declared here.
Bug: dawn:442
Change-Id: I5ba8de3412fb48b7957b67e7c413a5097f8ec00f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/27880
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
BUG=dawn:521
Change-Id: Ib6428ca366a70d73096f9b4442c1b7fb69a539ba
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28142
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Previously, this code path was gated on whether or not the texture
format is renderable. This should not be the case as this Vulkan
command only requires the texture to have TRANSFER_DST.
Bug: dawn:145
Change-Id: Ifd8f75a70477a8d159c04d1180247cd076c767bc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/27941
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
This patch removes the Toggle LazyClearBufferOnFirstUse and uses
the Toggle::LazyClearResourceOnFirstUse, which means buffer lazy
initialization has been enabled by default in Dawn.
BUG=dawn:414
TEST=dawn_end2end_tests
Change-Id: I6b247d9442b57b6bb3cb5a2208467036fef6b293
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/27820
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Depth/stencil copies of partial subresources is disallowed in
WebGPU because this is a D3D12 restriction. This restriction
need also to be enforced on B2T, T2B and WriteTexture.
This CL also fixes the subresource whole size calucation to use
the mip level. Previously, the 0th level size was always used.
This CL updates the validation to be correct and adds tests.
The DepthStencilCopy tests are factored into smaller helpers to
reduce code duplication.
Bug: dawn:439
Change-Id: I45d4836f6be1707c5171bddef875e535e935f7f4
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/26660
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This patch fixes the issues on the initialization of buffers with
MapRead usage and mappedAtCreation == true.
1. The buffers with MapRead usage and mappedAtCreation == true can be
read from the CPU side just after the creation of the buffer,
however at that time the internal pending command buffers may not
be executed, thus causing the buffer is not cleared as is expected.
2. On D3D12 the buffer with MapRead and mappedAtCreation == true is
created on the READBACK heap, so all the data written in the CPU
side cannot be uploaded to the GPU memory. When the buffer is mapped
again all the original data written through the CPU pointer will be
overwritten by the data in the GPU memory (which means it is also
cleared to 0).
This patch fixes this issue by:
1. clearing the buffers with mappedAtCreation == true on the CPU side.
2. on D3D12 making the buffer with MapRead and mappedAtCreation == true
use the staging buffer instead of mapping itself.
Note that this change is only related to the code path with Toggle
"nonzero_clear_resources_on_creation_for_testing" enabled, currently
we don't plan to do the similar change when we enable Dawn wire.
BUG=dawn:414
TEST=dawn_end2end_tests
Change-Id: I2b3d0840333e8d99759800ab9fc141d0a7cf2f8d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/27220
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
