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chromium / angle / angle / refs/heads/chromium/4865
commit293c0b516b47a46c218f1c3a5ec8556bf6ef3a3b[log] [tgz]
authorCharlie Lao <cclao@google.com>Fri Jan 21 23:53:38 2022
committerAngle LUCI CQ <angle-scoped@luci-project-accounts.iam.gserviceaccount.com>Tue Feb 01 21:09:04 2022
tree4f5676faca5144c8f20e98a926c3a13967ab7668
parent38fada351071dba3a2f580bfb530cc9646bd8208 [diff]
Vulkan: Cache commonly used 6 ushorts stream index array data

Looking at all app traces that we currently have, 16 out of 100 apps are
making glDrawElements calls without element buffer. And among these
usages, most of them are calling glDrawElements with 6 unsigned shorts,
which makes sense for drawing a quad. This CL caches first four
BufferHelper objects with 6 uint16_t indices in a buffer and reuse them
if the data matches.  With this we avoid create/destroy suballocations,
we even save the time of data copy and set DIRTY_BIT_INDEX_BUFFER when
called with same set of indices, which is the case for almost all apps
that uses glDrawElements based on app traces research.

In order to test the effect, I modified the `--minimize-gpu-work` to
keep glDrawElements calls with (count=6, tye=ushort) to pass down
count/type into angle, and only change the mode to point. That way this
new optimization will gets activated with `--minimze-gpu-work` command
line option (see crrev.com/c/3421377). With that, this CL sees cpu
overhead reduced from 2.54ms to 2.37ms on Pixel6 with
vulkan_offscreen_gardenscape.

Bug: b/215768827
Change-Id: I9b682868978e3bef7b5b9d1a596500ead2738d3e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3404677
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Charlie Lao <cclao@google.com>
3 files changed
tree: 4f5676faca5144c8f20e98a926c3a13967ab7668
  1. android/
  2. build_overrides/
  3. doc/
  4. extensions/
  5. gni/
  6. include/
  7. infra/
  8. samples/
  9. scripts/
  10. src/
  11. third_party/
  12. tools/
  13. util/
  14. .clang-format
  15. .gitattributes
  16. .gitignore
  17. .gn
  18. .style.yapf
  19. .vpython
  20. .vpython3
  21. .yapfignore
  22. additional_readme_paths.json
  23. Android.mk
  24. AUTHORS
  25. BUILD.gn
  26. codereview.settings
  27. CONTRIBUTORS
  28. DEPS
  29. DIR_METADATA
  30. dotfile_settings.gni
  31. LICENSE
  32. OWNERS
  33. PRESUBMIT.py
  34. README.chromium
  35. README.md
  36. WATCHLISTS
README.md

ANGLE - Almost Native Graphics Layer Engine

The goal of ANGLE is to allow users of multiple operating systems to seamlessly run WebGL and other OpenGL ES content by translating OpenGL ES API calls to one of the hardware-supported APIs available for that platform. ANGLE currently provides translation from OpenGL ES 2.0, 3.0 and 3.1 to Vulkan, desktop OpenGL, OpenGL ES, Direct3D 9, and Direct3D 11. Future plans include ES 3.2, translation to Metal and MacOS, Chrome OS, and Fuchsia support.

Level of OpenGL ES support via backing renderers

Direct3D 9Direct3D 11Desktop GLGL ESVulkanMetal
OpenGL ES 2.0completecompletecompletecompletecompletecomplete
OpenGL ES 3.0completecompletecompletecompletein progress
OpenGL ES 3.1incompletecompletecompletecomplete
OpenGL ES 3.2in progressin progressin progress

Platform support via backing renderers

Direct3D 9Direct3D 11Desktop GLGL ESVulkanMetal
Windowscompletecompletecompletecompletecomplete
Linuxcompletecomplete
Mac OS Xcompletein progress
iOSin progress
Chrome OScompleteplanned
Androidcompletecomplete
GGP (Stadia)complete
Fuchsiacomplete

ANGLE v1.0.772 was certified compliant by passing the OpenGL ES 2.0.3 conformance tests in October 2011.

ANGLE has received the following certifications with the Vulkan backend:

  • OpenGL ES 2.0: ANGLE 2.1.0.d46e2fb1e341 (Nov, 2019)
  • OpenGL ES 3.0: ANGLE 2.1.0.f18ff947360d (Feb, 2020)
  • OpenGL ES 3.1: ANGLE 2.1.0.f5dace0f1e57 (Jul, 2020)

ANGLE also provides an implementation of the EGL 1.4 specification.

ANGLE is used as the default WebGL backend for both Google Chrome and Mozilla Firefox on Windows platforms. Chrome uses ANGLE for all graphics rendering on Windows, including the accelerated Canvas2D implementation and the Native Client sandbox environment.

Portions of the ANGLE shader compiler are used as a shader validator and translator by WebGL implementations across multiple platforms. It is used on Mac OS X, Linux, and in mobile variants of the browsers. Having one shader validator helps to ensure that a consistent set of GLSL ES shaders are accepted across browsers and platforms. The shader translator can be used to translate shaders to other shading languages, and to optionally apply shader modifications to work around bugs or quirks in the native graphics drivers. The translator targets Desktop GLSL, Vulkan GLSL, Direct3D HLSL, and even ESSL for native GLES2 platforms.

Sources

ANGLE repository is hosted by Chromium project and can be browsed online or cloned with

git clone https://chromium.googlesource.com/angle/angle

Building

View the Dev setup instructions.

Contributing