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android / platform / external / angle / 5116f54eca
commit5116f54eca4f276de2da32c05eeee83c49428297[log] [tgz]
authorChristopher Cameron <ccameron@chromium.org>Tue Sep 05 13:50:50 2023 +0200
committerAngle LUCI CQ <angle-scoped@luci-project-accounts.iam.gserviceaccount.com>Wed Sep 06 09:52:45 2023 +0000
tree05f5928a7425dc9ef9c61c4f310dc8b48fa3ff7c
parentd664543f3e6d683bfdc3e31d2db99403ca8b1c40 [diff]
CopySubTexture: Handle sRGB source in GL backend

CopySubTexture should ignore the color encoding of both the source
and destination. The implementation currently ignores the color
encoding of the destination.

The implementation does not always ignore the color encoding of the
source. As an example of the consequences of this, an RGBA pixel
value of 0xFF/80/00/FF, when copied from a GL_SRGB8_ALPHA8 texture
to a GL_RGBA8 texture may result in a value of 0xFF/37/00/FF, if the
copy was executed using a shader (in which case the sRGB-to-linear
function was applied 0x80, resulting in the 0x37).

Update the OpenGL and shaders that do this blit, adding an option
to apply a linear-to-sRGB transformation to undo the transformation
applied by the sampler.

The linear-to-sRGB transformation must be applied on unpremultiplied
values. Ensure that the sequence of operations in all shaders is
first unpremultiply, then linear-to-sRGB, then premultiply. Also
remove optimizations to have the unpremultiply and premultiply
cancel each other out, if there is also a linear-to-sRGB being applied.

Bug: angleproject:7907
Change-Id: Iad5537e6b98f75d32a33be419a320129493e53a0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4839262
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: ccameron chromium <ccameron@chromium.org>
3 files changed
tree: 05f5928a7425dc9ef9c61c4f310dc8b48fa3ff7c
  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. build
  15. buildtools
  16. testing
  17. .clang-format
  18. .gitattributes
  19. .gitignore
  20. .gitmodules
  21. .gn
  22. .style.yapf
  23. .vpython
  24. .vpython3
  25. .yapfignore
  26. additional_readme_paths.json
  27. Android.mk
  28. AUTHORS
  29. BUILD.gn
  30. codereview.settings
  31. CONTRIBUTORS
  32. DEPS
  33. DIR_METADATA
  34. dotfile_settings.gni
  35. LICENSE
  36. OWNERS
  37. PRESUBMIT.py
  38. README.chromium
  39. README.md
  40. 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 [1]
iOScomplete [2]
Chrome OScompleteplanned
Androidcompletecomplete
GGP (Stadia)complete
Fuchsiacomplete

[1] Metal is supported on macOS 10.14+

[2] Metal is supported on iOS 12+

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