kc3-lang/angle

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  • Hash : 93560ef5
    Author : Shahbaz Youssefi
    Date : 2019-07-25T16:13:02 

    Vulkan: Seamful cube map emulation

In GLSL, a cube texture is sampled with one of textureCube* functions.
This function takes a 3D coordinate which is a vector from the center of
the cube and identifies a direction to sample from. GLES2.0 has the
following table that translates this 3D coordinate (Rx, Ry, Rz) to a
face and ST coordinates within that face. This table can be found in
Section 3.7.5 (Cube Map Texture Selection).

A compiler pass is implemented in ANGLE that replaces samplerCube
declarations with a sampler2DArray. The textureCube* functions are
replaced with the corresponding texture* functions with the translated
coordinates according to that table.

Gradients provided to textureCubeGrad are translated using the same
formulae, which is not precise but the spec specifies this projection to
be implementation dependent.

Helper invocations enabled through WQM (whole quad mode) cause a
nuisance in that the extrapolated varyings used as coordinates in a
textureCube call could have a different major axis (and therefore face)
from the non-helper invocations that lie within the geometry.
subgroupQuadSwap* operations are used in conjunction with
gl_HelperInvocation to make sure the helper threads calculate texture
UVs in the same face as the non-helper invocations.

Bug: angleproject:3300
Bug: angleproject:3240
Bug: angleproject:3243
Bug: angleproject:3732
Change-Id: I0cb6a9b1f2e1e6a392b5baca1c7118ed1c502ccf
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1715977
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

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  • 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
    		 thodg_m kc3_lang_org thodg_w www_kmx_io thodg thodg_l
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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 not started
    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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