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chromium / angle / angle / refs/heads/chromium/3825
commit88596beab31734b07cc3a2fbd3f8b2c82bfe588c[log] [tgz]
authorJamie Madill <jmadill@chromium.org>Thu Jun 13 18:17:48 2019
committerCommit Bot <commit-bot@chromium.org>Thu Jun 13 19:58:45 2019
tree3684e2de56e68e49fda10cb08f2d11de6d7f9389
parent954283317e6af92c8c31ee4023a90d6e905d50e2 [diff]
Vulkan: Implement a texture descriptor cache.

We noticed a significant hotspot in vkAllocateDesctiptorSets. The app
was repeatedly cycling through a few combinations of active textures.
For each state change in ANGLE we were allocating a new desctiptor set.
This in turn would trigger internal driver memory allocation and cause
jank. Using a cache avoids allocations entirely since the application
is rotating through a stable set of textures.

The descriptor cache is stored in each program. It is indexed by a set
of 32-bit serials. Each texture generates a unique serial for every
combination of VkImage and VkSampler that the texture owns. The texture
descriptor is refreshed every time a texture changes or is rebound.

The descriptor cache is accessed via an unoredered map with the texture
serial sets as the hash key. We also store the maximum active texture
index in the cache key so we don't need to hash and memcmp on all 64
active textures.

This will currently fail if more than MAX_UINT serials are generated.
But that number is high enough that it shouldn't be possible to hit
in practice in a practical amount of time.

Requires shifting the texture sync to ContextVk so we can get the new
serial after the textures are updated. And to make sure to update the
image layouts even if the descriptors are not dirty.

Improves performance of the T-Rex demo. Also improves the score of the
texture state change microbenchmark by about 40%.

Bug: angleproject:3117
Change-Id: Ieb9bec1e8c1a7619814afab767a1980b959a8241
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1642226
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
15 files changed
tree: 3684e2de56e68e49fda10cb08f2d11de6d7f9389
  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. additional_readme_paths.json
  20. AUTHORS
  21. BUILD.gn
  22. codereview.settings
  23. CONTRIBUTORS
  24. DEPS
  25. dotfile_settings.gni
  26. LICENSE
  27. OWNERS
  28. PRESUBMIT.py
  29. README.chromium
  30. README.md
  31. 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 and 3.0 to desktop OpenGL, OpenGL ES, Direct3D 9, and Direct3D 11. Support for translation from OpenGL ES to Vulkan is underway, and future plans include compute shader support (ES 3.1) and MacOS support.

Level of OpenGL ES support via backing renderers

Direct3D 9Direct3D 11Desktop GLGL ESVulkan
OpenGL ES 2.0completecompletecompletecompletein progress
OpenGL ES 3.0completecompletein progressnot started
OpenGL ES 3.1not startedin progressin progressnot started

Platform support via backing renderers

Direct3D 9Direct3D 11Desktop GLGL ESVulkan
Windowscompletecompletecompletecompletein progress
Linuxcompletein progress
Mac OS Xin progress
Chrome OScompleteplanned
Androidcompletein progress

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