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CMake-only fork of https://dawn.googlesource.com/dawn with cleaned, vendored dependencies
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Brian Ho 756a9d7e49 Create VkImage before importing external memory 
This CL is part of a chain of CLs that imports dma-bufs as VkImages
to support WebGPU on Chrome OS.

There are currently two steps for importing external memory into
Vulkan:

  1. DeviceVk::ImportExternalImage: calls into
     MemoryServiceOpaqueFD::ImportMemory which in turn calls into
     vkAllocateMemory and outputs a VkDeviceMemory handle to the
     imported memory.
  2. TextureVk::CreateFromExternal: creates the actual TextureVk
     object, creates the VkImage, and binds the VkDeviceMemory from
     ImportExternalImage to the VkImage.

For dma-buf support, however, we need to re-order these two steps
because importing dma-buf memory requires a handle to the VkImage
that will alias it [1].

This CL splits these two steps into three steps to ensure we create
the VkImage first so we can use it in vkAllocateMemory:

  1. TextureVk::CreateFromExternal: creates the TextureVk and
     VkImage (no longer concerns itself with vkBindImageMemory).
  2. DeviceVk::ImportExternalImage: now takes the VkImage as input
     but is otherwise unchanged.
  3. TextureVk::BindExternalMemory: calls vkBindImageMemory with
     handles to VkDeviceMemory and VkImage.

[1] https://www.khronos.org/registry/vulkan/specs/1.1-extensions/man/html/VkMemoryDedicatedAllocateInfo.html

BUG=chromium:996470

Change-Id: Id2d5951e9b573af79c44ce8c63be5210a279f946
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/13780
Commit-Queue: Brian Ho <hob@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
 		2019-11-20 01:50:50 +00:00
build_overrides Add Vulkan validation layers on Windows 2019-11-07 12:13:27 +00:00
docs Add .gitattributes to normalize EOL 2019-07-15 12:23:18 +00:00
examples Make the SwapChain interface match webgpu.h 2019-11-12 18:30:11 +00:00
generator Remove the "Base" from pure-frontend dawn_native types 2019-11-13 17:00:37 +00:00
infra/config [infra/config] Bump OS X SDK version for dawn. 2019-08-09 01:19:04 +00:00
scripts Add Vulkan validation layers on Windows 2019-11-07 12:13:27 +00:00
src Create VkImage before importing external memory 2019-11-20 01:50:50 +00:00
third_party mac newsdk: build glfw with -Wno-objc-multiple-method-names 2019-11-08 19:16:10 +00:00
.clang-format Add .clang-format 2017-11-28 16:18:39 -05:00
.gitattributes Add .gitattributes to normalize EOL 2019-07-15 12:23:18 +00:00
.gitignore Add vulkan-headers and vulkan-validation-layers to .gitignore 2019-11-08 09:17:40 +00:00
.gn PRESUBMIT.py: Add formatting checks. 2018-09-11 08:06:36 -04:00
AUTHORS Rename NXT -> Dawn in the comments 2018-07-18 22:54:06 +02:00
BUILD.gn BUILD.gn: Only build dawn_bindings in standalone 2019-11-19 18:58:50 +00:00
CONTRIBUTING.md Remove references to Github in README and CONTRIBUTING 2018-10-08 13:51:18 +00:00
DEPS Migrate Dawn fuzzers to using new SPVC split API 2019-11-13 15:37:47 +00:00
LICENSE Initial commit of all the NXT integration. 2017-04-20 14:38:20 -04:00
OWNERS Add component to OWNERS and fixup repo URL in README.chromium 2018-09-25 20:53:37 +00:00
PRESUBMIT.py PRESUBMIT.py: Add formatting checks. 2018-09-11 08:06:36 -04:00
README.chromium Add component to OWNERS and fixup repo URL in README.chromium 2018-09-25 20:53:37 +00:00
README.md Split the libdawn target in components with a single purpose. 2019-10-15 11:44:38 +00:00
codereview.settings Initial CQ configuration 2018-08-23 08:33:35 -04:00
dawn.json Make the SwapChain interface match webgpu.h 2019-11-12 18:30:11 +00:00
dawn_wire.json Add empty implementations of Push/PopErrorScope 2019-09-04 22:54:03 +00:00

README.md

Dawn, a WebGPU implementation

Dawn (formerly NXT) is an open-source and cross-platform implementation of the work-in-progress WebGPU standard. It exposes a C/C++ API that maps almost one-to-one to the WebGPU IDL and can be managed as part of a larger system such as a Web browser.

Dawn provides several WebGPU building blocks:

  • WebGPU C/C++ headers that applications and other building blocks use.
    • The main C header for the WebGPU API.
    • Definition of a structure of all function pointers for this specific Dawn version (called "proctable").
    • A C++ wrapper for the C header.
  • A "native" implementation of WebGPU using platforms' GPU APIs:
    • D3D12 on Windows 10
    • Metal on OSX (and eventually iOS)
    • Vulkan on Windows, Linux (eventually ChromeOS, Android and Fuchsia too)
    • OpenGL as best effort where available
  • A client-server implementation of WebGPU for applications that are in a sandbox without access to native drivers
  • A Dawn proc-table backend implementation of WebGPU for applications what want to be able to switch at runtime between native or client-server mode.

Directory structure

  • dawn.json: description of the API used to drive code generators.
  • examples: examples showing how Dawn is used.
  • generator: code generator for files produces from dawn.json
    • templates: Jinja2 templates for the generator
  • scripts: scripts to support things like continuous testing, build files, etc.
  • src:
    • common: helper code shared between core Dawn libraries and tests/samples
    • dawn_native: native implementation of WebGPU, one subfolder per backend
    • dawn_wire: client-server implementation of WebGPU
    • include: public headers for Dawn
    • tests: internal Dawn tests
      • end2end: WebGPU tests performing GPU operations
      • unittests: unittests and by extension tests not using the GPU
        • validation: WebGPU validation tests not using the GPU (frontend tests)
    • utils: helper code to use Dawn used by tests and samples
  • third_party: directory where dependencies live as well as their buildfiles.

Building Dawn

Dawn uses the Chromium build system and dependency management so you need to install depot_tools and add it to the PATH.

On Linux you need to have the pkg-config command:

# Install pkg-config on Ubuntu
sudo apt-get install pkg-config

Then get the source as follows:

# Clone the repo as "dawn"
git clone https://dawn.googlesource.com/dawn dawn && cd dawn

# Bootstrap the gclient configuration
cp scripts/standalone.gclient .gclient

# Fetch external dependencies and toolchains with gclient
gclient sync

Then generate build files using gn args out/Debug or gn args out/Release. A text editor will appear asking build options, the most common option is is_debug=true/false; otherwise gn args out/Release --list shows all the possible options.

Then use ninja -C out/Release to build dawn and for example ./out/Release/dawn_end2end_tests to run the tests.

Contributing

Please read and follow CONTRIBUTING.md. Dawn doesn't have a formal coding style yet, except what's defined by our clang format style. Overall try to use the same style and convention as code around your change.

If you find issues with Dawn, please feel free to report them on the bug tracker. For other discussions, please post to Dawn's mailing list.

License

Please see LICENSE.

Disclaimer

This is not an officially supported Google product.