e6582161b0
DXT1 has a specific 'BLACK' code that results in transparent black pixels when sampled. D3D does not have specific RGB-only DXT1 formats like OpenGL does so when this code is encountered, we sample 0 alpha for these pixels when GL would expect 1 because the alpha channel should not exist. Work around this by converting to DXT3 RGBA, adding an extra block of 1.0 alpha pixels for each color block. Mac Intel OpenGL requires additional workarounds to always sample 1.0 alpha. Set the texture swizzle parameters to force it. BUG=angleproject:3729 Change-Id: Ia3647085acd97bb01af4e95ef3f6f21dcfb6a554 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1804880 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Ian Elliott <ianelliott@google.com> |
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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 9 | Direct3D 11 | Desktop GL | GL ES | Vulkan | |
|---|---|---|---|---|---|
| OpenGL ES 2.0 | complete | complete | complete | complete | complete |
| OpenGL ES 3.0 | complete | complete | complete | in progress | |
| OpenGL ES 3.1 | in progress | complete | complete | in progress | |
| OpenGL ES 3.2 | planned | planned | planned |
Platform support via backing renderers
| Direct3D 9 | Direct3D 11 | Desktop GL | GL ES | Vulkan | |
|---|---|---|---|---|---|
| Windows | complete | complete | complete | complete | complete |
| Linux | complete | complete | |||
| Mac OS X | complete | ||||
| Chrome OS | complete | planned | |||
| Android | complete | complete | |||
| Fuchsia | in 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
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Join our Google group to keep up to date.
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Join us on IRC in the #ANGLEproject channel on FreeNode.
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Join us on Slack in the #angle channel.
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File bugs in the issue tracker (preferably with an isolated test-case).
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Choose an ANGLE branch to track in your own project.
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Read ANGLE development documentation.
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Become a code contributor.
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Use ANGLE's coding standard.
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Learn how to build ANGLE for Chromium development.
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Get help on debugging ANGLE.
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Go through ANGLE's orientation and sift through starter projects.
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Read about WebGL on the Khronos WebGL Wiki.
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Learn about implementation details in the OpenGL Insights chapter on ANGLE and this ANGLE presentation.
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Learn about the past, present, and future of the ANGLE implementation in this presentation.
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Watch a short presentation on the Vulkan back-end.
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Track the dEQP test conformance
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If you use ANGLE in your own project, we'd love to hear about it!