Revert "Implement EXT_depth_clamp"

This reverts commit f8c1418319ac2aef4b3101e322005b1d0f73120f.

Reason for revert: This change breaks angle_end2end_tests on Metal backend: https://ci.chromium.org/ui/p/chromium/builders/ci/ios-angle-intel/26035/overview

Original change's description:
> Implement EXT_depth_clamp
>
> * Added depthClamp to the RasterizerState
> * Added DepthWriteTest end2end tests covering
>   both clipped and clamped depth writes
>
> Capture
> * Updated serialized rasterizer state
> * Updated CaptureMidExecutionSetup
>
> OpenGL
> * Requires GL 3.2 or ARB_depth_clamp
>   on desktop contexts
> * Maps to EXT_depth_clamp on ES
>
> D3D11
> * Maps to the opposite of
>   D3D11_RASTERIZER_DESC.DepthClipEnable
> * The new tests uncover several edge cases where
>   a workaround is needed to implement unextended
>   OpenGL semantics on top of D3D
>
> Metal
> * Maps to the setDepthClipMode command
>
> Bug: angleproject:8047
> Bug: angleproject:8077
> Change-Id: I1b3448e5b84443e4be18af9bc22d2f8495ac8267
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4347753
> Reviewed-by: Geoff Lang <geofflang@chromium.org>
> Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>

Bug: angleproject:8047
Bug: angleproject:8077
Change-Id: I829add68c006c72b7b4acf03aee3efa8a9a16fac
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4350876
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Yuxin Hu <yuxinhu@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Yuxin Hu <yuxinhu@google.com>
23 files changed
tree: 7db6fc92281e8c12a845a6d92f1958891cc639db
  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 3.0completecompletecompletecompletecomplete
OpenGL ES 3.1incompletecompletecompletecomplete
OpenGL ES 3.2in progressin progressin progress

Additionally, OpenGL ES 1.1 is implemented in the front-end using OpenGL ES 3.0 features. This version of the specification is thus supported on all platforms specified above that support OpenGL ES 3.0 with known issues.

Platform support via backing renderers

Direct3D 9Direct3D 11Desktop GLGL ESVulkanMetal
Windowscompletecompletecompletecompletecomplete
Linuxcompletecomplete
Mac OS Xcompletecomplete
iOScomplete
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 1.5 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