kc3-lang/angle

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  • Hash : fbe49a8f
    Author : Qin Jiajia
    Date : 2016-12-19T14:19:10 

    ES31: Implement DrawArraysIndirect D3D part

There are four buffer types for vertex attribute storage in D3D11:
  DIRECT
  STATIC
  DYNAMIC
  CURRENT_VALUE

When drawing, it will call applyVertexBuffer to bind the right type
buffers in D3D11.

DIRECT uses the gl buffer directly without any translation.

CURRENT_VALUE uses a single value for the attribute.

STATIC translates the whole vertex buffer once. So it doesn't need the
first, count and instance informations since it always translates the
whole buffer.

DYNAMIC translates the data every frame. To improve the performance,
in implementation, it only translates 'count' vertexes from 'first'
location in vertex buffer with one drawing for non-instanced vertices.
'first' and 'count' are got from draw parameter list. And for the
translated vertex buffer, when drawing, the first vertex location is 0.

From above analysis, we can see that if all attribute storages are
non-dynamic, we can directly use the indirect buffer to draw. But for
dynamic storages, we have to calculate the first, count, and instances
from indirect buffer and apply them to translate the dynamic type
buffers. Meanwhile, we have to set the first to 0 (see above
description)when drawing.

DrawArrysIndirect implementation is like below:
1. Check whether all vertex attributes are non-dynamic
2. If yes, applyVertexBuffer and DrawInstancedIndirect
3. If no, 1) calculate first, count, and instances from indirect buffer.
          2) applyVertexBuffer with these parameters.
          4) Use DrawInstanced instead of DrawInstancedIndirect.

BUG=angleproject:1595
TEST=dEQP-GLES31.functional.draw_indirect.draw_arrays_indirect*

Change-Id: I36431f416443279d51de523b07ce60727914cbbf
Reviewed-on: https://chromium-review.googlesource.com/446690
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@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
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    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
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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 in progress
    OpenGL ES 3.0 complete complete in progress not started
    OpenGL ES 3.1 not started in progress in progress not started

    Platform support via backing renderers

    Direct3D 9 Direct3D 11 Desktop GL GL ES Vulkan
    Windows complete complete complete complete in progress
    Linux complete planned
    Mac OS X in progress
    Chrome OS complete planned
    Android complete planned

    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. For generating a Windows Store version of ANGLE view the Windows Store instructions

    Contributing

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