This will become wgpuGetProcAddress that is part of the webgpu.h and the
last gap in functionality for dawn.h to match webgpu.h.
BUG=dawn:22
Change-Id: I0dcb3b5e6bd99cb10db273fc101d3ec0161b7da0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12120
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
The functionality of the dawn_headers and libdawn targets are split into
the following targets:
- dawn_headers: the new version only exposes the "dawn.h" C API and no
longer includes the C++ API.
- dawncpp: the header and implementation of the C++ API that wraps the
C API. This is unbundled from the rest so the C++ API can be used
with libdawn_proc or other libraries implementing the C API.
- libdawn_proc: A DawnProcTable-backend implementation of the C API.
This is needed because in follow-up commit there will be three libraries
implementing the C API: libdawn_proc that trampolines where we want, and
libdawn_native/wire that don't have trampolines for better perf.
BUG=dawn:22
Change-Id: I5d941f0d98e5a4b633e14d67eb5269f7924f0647
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12160
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
This commit add a toggle to turn off vsync in Dawn.
When turn off vsync, choose vulkan present mode VK_PRESENT_MODE_IMMEDIATE_KHR
if the mode is available on the system, but if the mode isn't supported,
choose default mode VK_PRESENT_MODE_FIFO_KHR.
BUG=dawn:237
Change-Id: If400262b67cc8051422745e3bed737431183c0b6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12100
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Yizhou Jiang <yizhou.jiang@intel.com>
QueueWaitIdle can fail but if it fails, the error codes show that we
can't do anything about it so we just ignore the result.
BufferGetMemoryRequirements should always return memory types bits that
allow Dawn to select a good memory type of a resource.
BUG=dawn:19
Change-Id: I52beebf9f2be2bfb997ca9c1bf306618a73c9c4b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12183
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Fails on NVIDIA cards when Vulkan validation layers are enabled becuase the maximum size of a single allocation cannot be larger than or equal to 4G on some platforms.
BUG=dawn:241
Change-Id: I863a2219287d3d363b3013027ba8fc9df846b42d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12141
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Hao Li <hao.x.li@intel.com>
This patch adds an ASSERT expression on the object parameter of
DeviceBase::ValidateObject() so that Dawn won't crash in the debug
build when a nullptr object is being used unexpectedly.
BUG=dawn:209
Change-Id: I52ad57b58eb59edf04afc9963e260436d93e673e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12140
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
This commit makes the following changes:
- Unused fences are reset when they will next be used so there is a
single place where error handling is needed, either for resetting
an existing fence, or for creating a new fence.
- All accesses to VkCommandBuffer are moved to using the
CommandRecordingContext and GetPendingCommandBuffer is removed.
- Instead of tracking both a current (VkCommandBuffer + Pool) and
a command recording context that contains the same VkCommandBuffer,
the RecordingContext now holds the pool too, as well as a tag to
know if it was ever queried (meaning it contains commands).
- mRecordingContext is now always valid, such that
GetRecordingContext() doesn't need to return an error.
BUG=dawn:19
Change-Id: I853d4ecdc6905b66e842688f39d863e362f59b66
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12022
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Upload perf depends on buffer size. Try small and large buffers
to ensure allocation tuning is more accurate.
BUG=dawn:208
Change-Id: I1ee23454e86a31cf0a316946bc87550dad51e5c2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11961
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This change refactors D3D12 backend to have CommandRecordingContext
CommandRecordingContext allows us to, in a future, add additional
data to the context such as textures that need to be acquired and
released before command lists are executed.
The Device's pending command list and the command list which resides
in the Queue object were converted to use CommandRecordingContext.
Bug=dawn:234
Change-Id: Ic13a229fc1f15895ef71117ce638c942de224743
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11940
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
According to https://github.com/gpuweb/gpuweb/issues/405, None is a
valid value for GPUBindGroupLayoutBinding visibility to be passed in.
Bug: dawn:22
Change-Id: I7b30b7ab8ed6824718573fa25fad5d509846db55
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11980
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Following WebGPU spec change at
https://github.com/gpuweb/gpuweb/pull/468, this CL changes all
occurrences of setVertexBuffers to setVertexBuffer.
Bug: dawn:22
Change-Id: I48b551a89dc0934dfa61e661e9546a2b7eafd2fc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12020
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Allows buffer/texture direct access to underlying resource rather than indirectly with a opaque memory type.
BUG=dawn:27
Change-Id: I2eb69f4e30c96c431dbc96094d671be1e0a29869
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11800
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Roll third_party/spirv-cross/ 5431e1da2..e5d3a6655 (8 commits)
5431e1da2d..e5d3a6655e
$ git log 5431e1da2..e5d3a6655 --date=short --no-merges --format='%ad %ae %s'
2019-10-07 rharrison Update SPV_VERSION from 1.4 to 1.5
2019-10-07 post Workaround MSVC issue.
2019-10-07 post Do not consider aliased struct types if the master is not a block.
2019-10-07 post Run format_all.sh.
2019-10-04 post Do not value compare JSON files for regression purposes.
2019-10-04 post Reflect: Deal with workgroup size being specialization constants.
2019-10-03 frank.richter reference: Update to include workgroup_size
2019-10-03 frank.richter reflection: Write workgroup_size to JSON for compute shaders
Created with:
roll-dep third_party/spirv-cross
Roll third_party/shaderc/ e849e6783..621605ce2 (10 commits)
$ git log e849e6783..621605ce2 --date=short --no-merges --format='%ad %ae %s'
2019-10-08 rharrison Fix various build issues for chromium & dawn (#835)
2019-10-08 stevenperron Use a better python idiom (#834)
2019-10-08 stevenperron Fix up use of private spirv-tools headers. (#833)
2019-10-07 rharrison Roll spirv-cross ahead and update known_failures to fix build breakage (#831)
2019-10-07 9856269+sarahM0 spvc: Add an empty opt pass (#816)
2019-10-07 9856269+sarahM0 spvc: Add known_invalid file (#823)
2019-10-04 dneto Add support for targeting SPIR-V 1.5 (#822)
2019-10-03 rharrison Revert "Add spvc compiler to returned result (#821)" (#827)
2019-10-03 rharrison Add spvc compiler to returned result (#821)
2019-10-02 rharrison Rolling 4 dependencies (#817)
Created with:
roll-dep third_party/shaderc
Change-Id: I9e77d5c78eb647c1f117c356306e6dff7613722a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11963
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
This also introduces another combinator to ConsumeError for
ResultOrError.
BUG=dawn:19
Change-Id: Ic204313436f5e919473d604efd049fe3d3c27a66
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11862
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This makes all the regular WebGPU object creation handle errors properly
in the Vulkan backend instead of ASSERTing no Vulkan error is raised.
Static Create functions are added to all these types so that the details
of how the initialization is done is private, and it isn't possible to
construct an object but forget to initialize it.
BUG=dawn:19
Change-Id: I362b2d66b74dd7799ffbf69d732bc58caa97950b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11861
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This is necessary because @available(macOS 10.N, *) is taken on all iOS
versions but there is no way to say the branch is just not taken on any
iOS version. The proper way to deal with this is to add additional #if
guards to just not compile the code on iOS / macOS.
BUG=dawn:225
Change-Id: I76ec01f933364e9b47b5dda1198359f2ab4d1188
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11900
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This includes several changes to make dawn.h closer to webgpu.h (apart
from the renames and copyright changes):
- Make nextInChain follow the same type convention as the rest of the
header.
- Add defines that allow skipping the procs definition or the functions
declaration part of the header.
- Sort the methods by name for each object.
- Put the callback definition inside extern "C"
- Make the enums typedef have the name of the enum twice.
BUG=dawn:22
Change-Id: I36e4587d60ca43886636ebd19d54752004f4696d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11903
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
There was still some logic associated with push constants in Dawn. This
removes it to remove some code and reclaim one buffer in Metal. Related
code was found via `git grep "push constant"`.
BUG=
Change-Id: I17de9d47872483875b6fa292f8259ef1fc4ecaf3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11904
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
More concretely this makes Result<T*, E*> able to be move-constructed
from Result<ChildClassOfT*, E*> for free.
BUG=dawn:19
Change-Id: Iea2b8997079ac3bfcf270d6b73a79cf5cac2c06f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11860
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This prevents bugs where the compiler assumes a piece of memory
will be the same if read from twice.
Bug: dawn:230
Change-Id: Ib3358e56b6cf8f1fbf449c5d564ef85c969d695b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11840
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This adds a flag to enable using the reflection compiler from
SPIRV-Cross, and also updates the build rules to make sure that the
GLSL compiler is also present when using reflection, since the
reflection compiler subclassess the GLSL compiler.
BUG=dawn:231
Change-Id: I4e227cb955a3bb794d906dabdadffdaca001352b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11920
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Closing a command list can fail. We need to handle the error
gracefully instead of ignoring it.
As a fallout from adding MaybeError to ExecuteCommandList, need to
also add MaybeError to TickImpl, and OnBeforePresent.
Bug:dawn:19
Change-Id: I13685f3dd731f4ab49cbff4ce4edfa960d630464
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11841
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
If the swapchain creates its own queue, there can be races to determine
whether the submit of the present happens first. The didn't show up
in our samples but was an issue in real apps. Passing the queue to the
swapchain makes it simple to keep operations well ordered.
BUG=dawn:225
Change-Id: I9cc8e6e8140ad4a816373cffc9bda74ee826a41b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11640
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
BUG=dawn:231
Change-Id: Id037b8c6179ff1582b05a4923447ab292a0e1258
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11820
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
This CL adds missing optional label members to all descriptors. It is
not used yet but needed from the WebGPU side.
Bug: dawn:22
Change-Id: I103870f9207eed8168bc2245294888af4e1edd9f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11720
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
HandleError assumes that the error is not NoError. InjectError is
an untrusted wire command and needs to validate that NoError is not
passed.
Bug: chromium:1010703, chromium:1004368
Change-Id: Id48a877ded327a6e3a54fedb2be2c54eeca5cd3c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11780
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This CL adds a StringMessageMatcher to the wire unittests harness
to validate that messages are not degenerate.
Bug: chromium:1004368
Change-Id: I121a259e67938b06ccc5e9829abfa3e25fffc003
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11740
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
We were generating has_member for all pointer members which meant
it was possible to incorrectly pass nullptr for required arguments.
Bug: chromium:1009166
Change-Id: I5e32bab5ccae010468e55897ae9840ab8fda684f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11760
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
A draw should be valid if the currently set bind groups match the
current pipeline layout, irrespective of changes in pipeline layout.
This is different from the descriptor set inheritance in Vulkan which
Dawn used to follow.
Bug: dawn:201
Change-Id: I1181ba80614ae40d665094f4ea742804565f6ed3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11641
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Roll third_party/SPIRV-Tools/ 958f7e72a..9eb1c9a4c (20 commits)
958f7e72a7..9eb1c9a4c4
$ git log 958f7e72a..9eb1c9a4c --date=short --no-merges --format='%ad %ae %s'
2019-10-01 stevenperron Add continue construct analysis to struct cfg analysis (#2922)
2019-09-27 stevenperron Record trailing line dbg instructions (#2926)
2019-09-27 rharrison Add removing references to debug instructions when removing them (#2923)
2019-09-27 paulthomson spirv-fuzz: allow interestingness script arguments (#2925)
2019-09-27 ehsannas Add Kokoro bots for building with Bazel. (#2914)
2019-09-27 alanbaker Refactor the InstructionPass (#2924)
2019-09-26 afdx spirv-fuzz: do not allow a dead break to target an unreachable block (#2917)
2019-09-26 afdx spirv-fuzz: preserve some analyses when permuting blocks (#2918)
2019-09-25 alanbaker Only allow previously declared forward refs in structs (#2920)
2019-09-25 stevenperron Handle id overflow in wrap-opkill (#2916)
2019-09-25 afdx spirv-fuzz: do not replace struct indices with synonyms (#2915)
2019-09-25 afdx spirv-fuzz: Fixes to preconditions for adding dead break/continue edges (#2904)
2019-09-25 afdx spirv-fuzz: do not replace a pointer argument to a function call with a synonym (#2901)
2019-09-25 afdx spirv-fuzz: do not replace boolean constant argument to OpPhi instruction (#2903)
2019-09-24 alanbaker Remove validate_datarules.cpp (#2911)
2019-09-24 stevenperron Handle extract with no indexes (#2910)
2019-09-24 ehsannas Add Bazel build configuration. (#2891)
2019-09-24 stevenperron Handle id overflow in convert local access chains (#2908)
2019-09-24 dsinclair Add OpCopyMemory test to SVA. (#2885)
2019-09-23 dsinclair Add missing GN dependency (#2899)
Roll third_party/glslang/ 973d0e538..7bc047326 (1 commit)
973d0e5382..7bc047326e
$ git log 973d0e538..7bc047326 --date=short --no-merges --format='%ad %ae %s'
2019-09-18 laddoc Reflection will crash when the VS input symbol defines the same name with FS output symbol
Roll third_party/shaderc/ cb8b3fc5c..e849e6783 (4 commits)
cb8b3fc5ca..e849e6783d
$ git log cb8b3fc5c..e849e6783 --date=short --no-merges --format='%ad %ae %s'
2019-09-23 rharrison Add logging missing failures to spvc test script (#815)
2019-09-23 rharrison Add --update_known_failures to spvc test script (#813)
2019-09-23 rharrison Another round of cleaning the spvc test script (#811)
2019-09-23 rharrison Rolling 2 dependencies (#812)
Roll third_party/spirv-headers/ 601d73872..842ec9067 (4 commits)
601d738723..842ec90674
$ git log 601d73872..842ec9067 --date=short --no-merges --format='%ad %ae %s'
2019-09-24 ehsannas Improve the doc on using Bazel.
2019-09-24 rex.xu Bump the SPIR-V version to 1.5
2019-09-23 ehsannas Update documentation.
2019-09-18 ehsannas Add a Bazel build file.
Created with:
roll-dep third_party/SPIRV-Tools third_party/glslang third_party/shaderc third_party/spirv-cross third_party/spirv-headers
Change-Id: If888854a1b123b01cd14169d9e2ac0cf2b0eec00
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11741
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
This patch implements ASSERT_SUCCESS(hr) as a macro instead of a
function so that when hr fails Dawn can print out the line number of the
expression that causes the failure.
For example, previously we will always get the following error message
because ASSERT_SUCCESS is a function:
Assertion failure at ../../src/dawn_native/d3d12/DeviceD3D12.cpp:43
(ASSERT_SUCCESS): (((HRESULT)(hr)) >= 0)
Now we can get more details about where the failure occurs because now
ASSERT_SUCCESS is a macro:
Assertion failure at ../../src/dawn_native/d3d12/DeviceD3D12.cpp:59
(Initialize): (((HRESULT)(mD3d12Device->CreateCommandQueue(&queueDesc,
__uuidof(**(&mFence)), IID_PPV_ARGS_Helper(&mFence)))) >= 0)
BUG=dawn:178
Change-Id: I435ee2f418658bca276f439fcabfabbfecbff998
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11700
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This fixes a problem where client-generated errors weren't properly
captured in error scopes.
Bug: chromium:1004368
Change-Id: Ic0f6e5bc5e281c676ea7154dd217cfc8dd51be5c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11642
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This patch fixes an undefined behaviour on Metal and Vulkan when there
is a color state whose corresponding fragment output is not declared in
the fragment shader.
According to Vulkan SPEC (Chapter 14.3), the input values to blending or
color attachment writes are undefined for components which do not
correspond to a fragment shader output. Vulkan validation layer follows
the SPEC that it only allows the shader to not produce a matching output
if the writemask is 0, or it will report a warning when the application
is against this rule.
When no fragment output matches the color state in a render pipeline,
the output differs on different Metal devices. On some Metal devices the
fragment output will be (0, 0, 0, 0) even if it is not declared in the
shader, while on others there will be no fragment outputs and the content
in the color attachments is not changed.
This patch fixes this issue by setting the color write mask to 0 to
prevent the undefined values being written into the color attachments.
With this patch, the following end2end tests will not report warnings
any more when we enable the Vulkan validation layer:
ObjectCachingTest.RenderPipelineDeduplicationOnLayout/Vulkan
ObjectCachingTest.RenderPipelineDeduplicationOnVertexModule/Vulkan
ObjectCachingTest.RenderPipelineDeduplicationOnFragmentModule/Vulkan
BUG=dawn:209
TEST=dawn_end2end_tests
Change-Id: I5613daa1b9a45349ea1459fbdfe4a12d6149f0f7
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/11581
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Corentin Wallez
Yizhou Jiang
Austin Eng
Li, Hao
Jiawei Shao
Bryan Bernhart
Rafael Cintron
Ryan Harrison
François Beaufort
Mathieu-Andre Chiasson
Jinho Bang