kc3-lang/angle

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  • Hash : 20e7bbb7
    Author : Shahbaz Youssefi
    Date : 2022-03-18T17:03:18 

    Vulkan: Fix invalidate of attachments with emulated format

Some image formats may be emulated such that the emulated format has
more channels than the original.  ANGLE clears the image once so that
these extra channels contain valid values, and carefully ensures they
are never modified.

For swapchain images with such formats, as they are automatically
invalidated at the end of the frame, a workaroud was added to make sure
they are re-cleared in the beginning of the next frame.  This however
doesn't fix the issue of glInvalidateFramebuffer resulting in the
contents of attachments with such formats to be discarded (even if the
following render pass clears it, the contents are invalid in between).

This change instead makes sure invalidate of images with emulated
formats that have extra channels are handled appropriately:

- On IMR hardware, the invalidate is dropped altogether as it provides
  little to no benefit.
- On TBR hardware, a clear is automatically staged on the invalidated
  image.

The latter replaces the workaround that was added to make the following
render pass use loadOp=CLEAR, by adding a clear that's respected
regardless of what the future usage is.

This change also paves the way for a future change where the invalidate
of color attachments is tracked in render passes similarly to how
depth/stencil currently is.  With this change, the image is no longer in
an inconsistent state where its contents are considered invalid, even
though some channels are meant to remain valid.

Bug: angleproject:6860
Change-Id: Iec5b4854dfbe3a0bf93cd5aa82c19fe116065744
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3536389
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

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    Description

    A conformant OpenGL ES implementation for Windows, Mac, Linux, iOS and Android.

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    		 kc3_lang_org www_kmx_io thodg_w thodg_l thodg thodg_m
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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, 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 9 Direct3D 11 Desktop GL GL ES Vulkan Metal
    OpenGL ES 2.0 complete complete complete complete complete complete
    OpenGL ES 3.0 complete complete complete complete in progress
    OpenGL ES 3.1 incomplete complete complete complete
    OpenGL ES 3.2 in progress in progress in progress

    Platform support via backing renderers

    Direct3D 9 Direct3D 11 Desktop GL GL ES Vulkan Metal
    Windows complete complete complete complete complete
    Linux complete complete
    Mac OS X complete in progress
    iOS in progress
    Chrome OS complete planned
    Android complete complete
    GGP (Stadia) complete
    Fuchsia complete

    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

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