kc3-lang/angle

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  • Hash : dae3c851
    Author : Shahbaz Youssefi
    Date : 2025-03-14T11:44:53 

    Vulkan: Bake non-shader state into linked pipeline

When using VK_EXT_graphics_pipeline_library, previously ANGLE would
create three pipelines libraries:

* The Shaders library was created based on the GL program's shaders + a
  few static states.  This typically hit the program's own pipeline's
  cache that was warmed up during link.
* The VertexInput and FragmentOutput libraries were created at draw
  time, which used the global pipeline cache

At draw time, immediately after creating the non-Shaders libraries, the
three libraries were linked into the final pipeline to be used by the
draw call.

This caused an inefficiency; because the non-Shaders libraries were
created independently from the Shaders library, they had to be compiled
pessimistically, for example because they could not be optimized to take
into account the precision of the fragment shader's outputs or whether
any value is const (typically alpha being set to one).

Given the creation of VertexInput and FragmentOutput libraries is
typically quite fast (the former being no-op and dynamic state anyway),
this change removes the need for creating those libraries, and directly
specifies the vertex input and fragment output state when creating the
final pipeline out of the Shaders library.

In this way, the same fragment output state can be tailored to the exact
shaders it is being used with and incur a smaller overhead.  In this
change, the linked pipeline is cached in the GL program's pipeline
cache, which is never synced to the blob cache as producing it is
assumed to be fast already.

Bug: angleproject:42265839
Change-Id: I8496ea37771555522bdc9de94043a1b56fa5967e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6354205
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: mohan maiya <m.maiya@samsung.com>
Reviewed-by: Charlie Lao <cclao@google.com>

  • Properties

  • Git HTTP https://git.kmx.io/kc3-lang/angle.git
    Git SSH git@git.kmx.io:kc3-lang/angle.git
    Public access ? public
    Description

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

    Homepage

    Github
    Users
    		 kc3_lang_org thodg_w www_kmx_io thodg_l thodg thodg_m
    Tags

  • 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 complete
    OpenGL ES 3.1 incomplete complete complete complete
    OpenGL ES 3.2 in progress in progress complete

    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 9 Direct3D 11 Desktop GL GL ES Vulkan Metal
    Windows complete complete complete complete complete
    Linux complete complete
    Mac OS X complete complete [1]
    iOS complete [2]
    Chrome OS complete planned
    Android complete complete
    Fuchsia complete

    [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)
    • OpenGL ES 3.2: ANGLE 2.1.2.21688.59f158c1695f (Sept, 2023)

    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.

    OpenCL Implementation

    In addition to OpenGL ES, ANGLE also provides an optional OpenCL runtime built into the same output GLES lib.

    This work/effort is currently work-in-progress/experimental.

    This work provides the same benefits as the OpenGL implementation, having OpenCL APIs be translated to other HW-supported APIs available on that platform.

    Level of OpenCL support via backing renderers

    Vulkan OpenCL
    OpenCL 1.0 in progress in progress
    OpenCL 1.1 in progress in progress
    OpenCL 1.2 in progress in progress
    OpenCL 3.0 in progress in progress

    Each supported backing renderer above ends up being an OpenCL Platform for the user to choose from.

    The OpenCL backend is a “passthrough” implementation which does not perform any API translation at all, instead forwarding API calls to other OpenCL driver(s)/implementation(s).

    OpenCL also has an online compiler component to it that is used to compile OpenCL C source code at runtime (similarly to GLES and GLSL). Depending on the chosen backend(s), compiler implementations may vary. Below is a list of renderers and what OpenCL C compiler implementation is used for each:

    • Vulkan : clspv
    • OpenCL : Compiler is part of the native driver

    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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