DOCSLIB.ORG

GLSL Specification

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
GLSL Specification The OpenGL® Shading Language Language Version: 4.60 Document Revision: 3 23-Jul-2017 Editor: John Kessenich, Google Version 1.1 Authors: John Kessenich, Dave Baldwin, Randi Rost Copyright (c) 2008-2017 The Khronos Group Inc. All Rights Reserved. This specification is protected by copyright laws and contains material proprietary to the Khronos Group, Inc. It or any components may not be reproduced, republished, distributed, transmitted, displayed, broadcast, or otherwise exploited in any manner without the express prior written permission of Khronos Group. You may use this specification for implementing the functionality therein, without altering or removing any trademark, copyright or other notice from the specification, but the receipt or possession of this specification does not convey any rights to reproduce, disclose, or distribute its contents, or to manufacture, use, or sell anything that it may describe, in whole or in part. Khronos Group grants express permission to any current Promoter, Contributor or Adopter member of Khronos to copy and redistribute UNMODIFIED versions of this specification in any fashion, provided that NO CHARGE is made for the specification and the latest available update of the specification for any version of the API is used whenever possible. Such distributed specification may be reformatted AS LONG AS the contents of the specification are not changed in any way. The specification may be incorporated into a product that is sold as long as such product includes significant independent work developed by the seller. A link to the current version of this specification on the Khronos Group website should be included whenever possible with specification distributions. Khronos Group makes no, and expressly disclaims any, representations or warranties, express or implied, regarding this specification, including, without limitation, any implied warranties of merchantability or fitness for a particular purpose or noninfringement of any intellectual property. Khronos Group makes no, and expressly disclaims any, warranties, express or implied, regarding the correctness, accuracy, completeness, timeliness, and reliability of the specification. Under no circumstances will the Khronos Group, or any of its Promoters, Contributors or Members or their respective partners, officers, directors, employees, agents, or representatives be liable for any damages, whether direct, indirect, special or consequential damages for lost revenues, lost profits, or otherwise, arising from or in connection with these materials. Khronos, SYCL, SPIR, WebGL, EGL, COLLADA, StreamInput, OpenVX, OpenKCam, glTF, OpenKODE, OpenVG, OpenWF, OpenSL ES, OpenMAX, OpenMAX AL, OpenMAX IL and OpenMAX DL are trademarks and WebCL is a certification mark of the Khronos Group Inc. OpenCL is a trademark of Apple Inc. and OpenGL and OpenML are registered trademarks and the OpenGL ES and OpenGL SC logos are trademarks of Silicon Graphics International used under license by Khronos. All other product names, trademarks, and/or company names are used solely for identification and belong to their respective owners. ii Table of Contents 1 Introduction.................................................................................................................................1 1.1 Acknowledgments................................................................................................................2 1.2 Changes................................................................................................................................3 1.2.1 Summary of Changes from Revision 7 of GLSL Version 4.50....................................3 1.3 Overview..............................................................................................................................3 1.4 Error Handling......................................................................................................................3 1.5 Typographical Conventions..................................................................................................4 1.6 Deprecation..........................................................................................................................4 2 Overview of OpenGL Shading....................................................................................................5 2.1 Vertex Processor...................................................................................................................5 2.2 Tessellation Control Processor.............................................................................................5 2.3 Tessellation Evaluation Processor........................................................................................6 2.4 Geometry Processor.............................................................................................................6 2.5 Fragment Processor..............................................................................................................6 2.6 Compute Processor...............................................................................................................6 3 Basics..........................................................................................................................................8 3.1 Character Set and Phases of Compilation............................................................................8 3.2 Source Strings......................................................................................................................9 3.3 Preprocessor.........................................................................................................................9 3.4 Comments..........................................................................................................................15 3.5 Tokens................................................................................................................................15 3.6 Keywords............................................................................................................................15 3.7 Identifiers...........................................................................................................................18 3.8 Definitions..........................................................................................................................18 3.8.1 Static Use....................................................................................................................18 3.8.2 Dynamically Uniform Expressions and Uniform Control Flow.................................18 4 Variables and Types...................................................................................................................20 4.1 Basic Types.........................................................................................................................20 4.1.1 Void.............................................................................................................................24 4.1.2 Booleans.....................................................................................................................24 4.1.3 Integers.......................................................................................................................24 4.1.4 Floating-Point Variables.............................................................................................26 4.1.5 Vectors........................................................................................................................27 4.1.6 Matrices......................................................................................................................27 4.1.7 Opaque Types.............................................................................................................28 4.1.7.1 Samplers.............................................................................................................28 4.1.7.2 Images.................................................................................................................28 4.1.7.3 Atomic Counters.................................................................................................29 iii 4.1.8 Structures....................................................................................................................29 4.1.9 Arrays..........................................................................................................................30 4.1.10 Implicit Conversions................................................................................................35 4.1.11 Initializers.................................................................................................................36 4.2 Scoping...............................................................................................................................38 4.3 Storage Qualifiers...............................................................................................................41 4.3.1 Default Storage Qualifier............................................................................................42 4.3.2 Constant Qualifier......................................................................................................42 4.3.3 Constant Expressions.................................................................................................43 4.3.4 Input Variables............................................................................................................45 4.3.5 Uniform Variables.......................................................................................................48
Load more

Recommended publications
  • GLSL 4.50 Spec
    The OpenGL® Shading Language Language Version: 4.50 Document Revision: 7 09-May-2017 Editor: John Kessenich, Google Version 1.1 Authors: John Kessenich, Dave Baldwin, Randi Rost Copyright (c) 2008-2017 The Khronos Group Inc. All Rights Reserved. This specification is protected by copyright laws and contains material proprietary to the Khronos Group, Inc. It or any components may not be reproduced, republished, distributed, transmitted, displayed, broadcast, or otherwise exploited in any manner without the express prior written permission of Khronos Group. You may use this specification for implementing the functionality therein, without altering or removing any trademark, copyright or other notice from the specification, but the receipt or possession of this specification does not convey any rights to reproduce, disclose, or distribute its contents, or to manufacture, use, or sell anything that it may describe, in whole or in part. Khronos Group grants express permission to any current Promoter, Contributor or Adopter member of Khronos to copy and redistribute UNMODIFIED versions of this specification in any fashion, provided that NO CHARGE is made for the specification and the latest available update of the specification for any version of the API is used whenever possible. Such distributed specification may be reformatted AS LONG AS the contents of the specification are not changed in any way. The specification may be incorporated into a product that is sold as long as such product includes significant independent work developed by the seller. A link to the current version of this specification on the Khronos Group website should be included whenever possible with specification distributions.
    [Show full text]
  • Marc Benito Bermúdez, Matina Maria Trompouki, Leonidas Kosmidis
    Evaluation of Graphics-based General Purpose Computation Solutions for Safety Critical Systems: An Avionics Case Study Marc Benito Bermúdez, Matina Maria Trompouki, Leonidas Kosmidis Juan David Garcia, Sergio Carretero, Ken Wenger {marc.benito, leonidas.Kosmidis}@bsc.es Motivation • Massively parallel architectures, high computational power and high energy efficiency, in thermally limited systems • OpenCL and CUDA dominate the market of GPGPU Embedded GPUs can programming in HPC provide the required • Easily programmable APIs performance • Cannot be used in safety critical systems because of pointers and dynamic memory allocation • Safety Critical Systems require higher performance to support new advanced functionalities • In this Bachelor’s thesis [1] awarded with a Technology Transfer Award we: Characteristics of Safety Critical Systems: • Analyze their differences compared to desktop graphics APIs • Certification: Need to comply with safety standards: ISO26262 / DO178 • Demonstrate how a safety-critical application written in a non-certifiable • Very conservative in terms of hardware and software: simple programming model can be converted to use safety-critical APIs. processors, mainly single core • Evaluate performance and programmability trade-offs OpenGL and Vulkan versions diagram Visual output of the Avionics Application Initial prototype GPU-based avionics application, written in Vulkan and ported to OpenGL SC 2 following the guidelines of [2][3]. Basic Compute Shader Shader 3D Image Processed Image Brook SC Porting and Comparison
    [Show full text]
  • The Opencl Specification
    The OpenCL Specification Version: 2.0 Document Revision: 22 Khronos OpenCL Working Group Editor: Aaftab Munshi Last Revision Date: 3/18/14 Page 1 1. INTRODUCTION ............................................................................................................... 10 2. GLOSSARY ......................................................................................................................... 12 3. THE OPENCL ARCHITECTURE .................................................................................... 23 3.1 Platform Model ................................................................................................................................ 23 3.2 Execution Model .............................................................................................................................. 25 3.2.1 Execution Model: Mapping work-items onto an NDRange ........................................................................28 3.2.2 Execution Model: Execution of kernel-instances ........................................................................................30 3.2.3 Execution Model: Device-side enqueue ......................................................................................................31 3.2.4 Execution Model: Synchronization .............................................................................................................32 3.2.5 Execution Model: Categories of Kernels ....................................................................................................33 3.3 Memory
    [Show full text]
  • Standards for Vision Processing and Neural Networks
    Standards for Vision Processing and Neural Networks Radhakrishna Giduthuri, AMD [email protected] © Copyright Khronos Group 2017 - Page 1 Agenda • Why we need a standard? • Khronos NNEF • Khronos OpenVX dog Network Architecture Pre-trained Network Model (weights, …) © Copyright Khronos Group 2017 - Page 2 Neural Network End-to-End Workflow Neural Network Third Vision/AI Party Applications Training Frameworks Tools Datasets Trained Vision and Neural Network Network Inferencing Runtime Network Model Architecture Desktop and Cloud Hardware Embedded/Mobile Embedded/MobileEmbedded/Mobile Embedded/Mobile/Desktop/CloudVision/InferencingVision/Inferencing Hardware Hardware cuDNN MIOpen MKL-DNN Vision/InferencingVision/Inferencing Hardware Hardware GPU DSP CPU Custom FPGA © Copyright Khronos Group 2017 - Page 3 Problem: Neural Network Fragmentation Neural Network Training and Inferencing Fragmentation NN Authoring Framework 1 Inference Engine 1 NN Authoring Framework 2 Inference Engine 2 NN Authoring Framework 3 Inference Engine 3 Every Tool Needs an Exporter to Every Accelerator Neural Network Inferencing Fragmentation toll on Applications Inference Engine 1 Hardware 1 Vision/AI Inference Engine 2 Hardware 2 Application Inference Engine 3 Hardware 3 Every Application Needs know about Every Accelerator API © Copyright Khronos Group 2017 - Page 4 Khronos APIs Connect Software to Silicon Software Silicon Khronos is an International Industry Consortium of over 100 companies creating royalty-free, open standard APIs to enable software to access
    [Show full text]
  • Khronos Template 2015
    Ecosystem Overview Neil Trevett | Khronos President NVIDIA Vice President Developer Ecosystem [email protected] | @neilt3d © Copyright Khronos Group 2016 - Page 1 Khronos Mission Software Silicon Khronos is an Industry Consortium of over 100 companies creating royalty-free, open standard APIs to enable software to access hardware acceleration for graphics, parallel compute and vision © Copyright Khronos Group 2016 - Page 2 http://accelerateyourworld.org/ © Copyright Khronos Group 2016 - Page 3 Vision Pipeline Challenges and Opportunities Growing Camera Diversity Diverse Vision Processors Sensor Proliferation 22 Flexible sensor and camera Use efficient acceleration to Combine vision output control to GENERATE PROCESS with other sensor data an image stream the image stream on device © Copyright Khronos Group 2016 - Page 4 OpenVX – Low Power Vision Acceleration • Higher level abstraction API - Targeted at real-time mobile and embedded platforms • Performance portability across diverse architectures - Multi-core CPUs, GPUs, DSPs and DSP arrays, ISPs, Dedicated hardware… • Extends portable vision acceleration to very low power domains - Doesn’t require high-power CPU/GPU Complex - Lower precision requirements than OpenCL - Low-power host can setup and manage frame-rate graph Vision Engine Middleware Application X100 Dedicated Vision Processing Hardware Efficiency Vision DSPs X10 GPU Compute Accelerator Multi-core Accelerator Power Efficiency Power X1 CPU Accelerator Computation Flexibility © Copyright Khronos Group 2016 - Page 5 OpenVX Graphs
    [Show full text]
  • Khronos Native Platform Graphics Interface (EGL Version 1.4 - April 6, 2011)
    Khronos Native Platform Graphics Interface (EGL Version 1.4 - April 6, 2011) Editor: Jon Leech 2 Copyright (c) 2002-2011 The Khronos Group Inc. All Rights Reserved. This specification is protected by copyright laws and contains material proprietary to the Khronos Group, Inc. It or any components may not be reproduced, repub- lished, distributed, transmitted, displayed, broadcast or otherwise exploited in any manner without the express prior written permission of Khronos Group. You may use this specification for implementing the functionality therein, without altering or removing any trademark, copyright or other notice from the specification, but the receipt or possession of this specification does not convey any rights to reproduce, disclose, or distribute its contents, or to manufacture, use, or sell anything that it may describe, in whole or in part. Khronos Group grants express permission to any current Promoter, Contributor or Adopter member of Khronos to copy and redistribute UNMODIFIED versions of this specification in any fashion, provided that NO CHARGE is made for the specification and the latest available update of the specification for any version of the API is used whenever possible. Such distributed specification may be re- formatted AS LONG AS the contents of the specification are not changed in any way. The specification may be incorporated into a product that is sold as long as such product includes significant independent work developed by the seller. A link to the current version of this specification on the Khronos Group web-site should be included whenever possible with specification distributions. Khronos Group makes no, and expressly disclaims any, representations or war- ranties, express or implied, regarding this specification, including, without limita- tion, any implied warranties of merchantability or fitness for a particular purpose or non-infringement of any intellectual property.
    [Show full text]
  • The Openvx™ Specification
    The OpenVX™ Specification Version 1.0.1 Document Revision: r31169 Generated on Wed May 13 2015 08:41:43 Khronos Vision Working Group Editor: Susheel Gautam Editor: Erik Rainey Copyright ©2014 The Khronos Group Inc. i Copyright ©2014 The Khronos Group Inc. All Rights Reserved. This specification is protected by copyright laws and contains material proprietary to the Khronos Group, Inc. It or any components may not be reproduced, republished, distributed, transmitted, displayed, broadcast or otherwise exploited in any manner without the express prior written permission of Khronos Group. You may use this specifica- tion for implementing the functionality therein, without altering or removing any trademark, copyright or other notice from the specification, but the receipt or possession of this specification does not convey any rights to reproduce, disclose, or distribute its contents, or to manufacture, use, or sell anything that it may describe, in whole or in part. Khronos Group grants express permission to any current Promoter, Contributor or Adopter member of Khronos to copy and redistribute UNMODIFIED versions of this specification in any fashion, provided that NO CHARGE is made for the specification and the latest available update of the specification for any version of the API is used whenever possible. Such distributed specification may be re-formatted AS LONG AS the contents of the specifi- cation are not changed in any way. The specification may be incorporated into a product that is sold as long as such product includes significant independent work developed by the seller. A link to the current version of this specification on the Khronos Group web-site should be included whenever possible with specification distributions.
    [Show full text]
  • Digital Asset Exchange
    DDiiggiittaall AAsssseett EExxcchhaannggee Dr. Rémi Arnaud Sony Computer Entertainment Khronos Group Promoter © Copyright Khronos Group, 2007 - Page 1 •www.khronos.org •Founded in January 2000 by a number of leading media-centric companies, including: 3Dlabs, ATI, Discreet, Evans & Sutherland, Intel, NVIDIA, SGI and Sun Microsystems. (currently more than 100) •Dedicated to the creation of royalty-free open standard APIs to enable the playback of rich media on a wide variety of platforms and devices. •Home of 11 WG, including: OpenGL, OpenGL ES, OpenVG, OpenKODE, OpenSL, COLLADA •New WG introduced at GDC: glFX, Compositing © Copyright Khronos Group, 2007 - Page 2 CCOOLLLLAADDAA aass aa SSCCEE pprroojjeecctt •SCE project, started in August 2003 - Goal: raise the quality and productivity of content development - free the content from proprietary formats and API, bring more tools to game developers, lower the barrier to entry for small tool companies, facilitate middleware integration, bring ‘advanced’ features in the main stream, drastically improve artist productivity. •Common description language - Developers get the content in a standard form - Tools can interchange content - Developers can mix and match tools during development - Many specialized tools can be independently created, and incorporated into developer’s content pipeline •COLLAborative Design Activity, SCE brought to the same table the major DCC vendors: Discreet, Alias, Softimage •Released v1.0 specification in August 2004 •Gathered feedback, waiting for tools to provide useful
    [Show full text]
  • Opengl SC 2.0?
    White Paper: Should You Be Using OpenGL SC 2.0? Introduction Ten years after the release of the first OpenGL® safety certifiable API specification the Khronos Group, the industry group responsible for graphics and video open standards, has released a new OpenGL safety certifiable specification, OpenGL SC 2.0. While both OpenGL SC 2.0 and the earlier safety critical OpenGL specification, OpenGL SC 1.0.1, provide high performance graphics interfaces for creating visualization and user interfaces, OpenGL SC 2.0 enables a higher degree of application capability with new levels of performance and control. This white paper will introduce OpenGL SC 2.0 by providing context in relationship to existing embedded OpenGL specifications, the differences compared to the earlier safety certifiable OpenGL specification, OpenGL SC 1.0.1 and an overview of new capabilities. Overview of OpenGL Specifications OpenGL Graphics Language (the GL in OpenGL) Application Programming Interfaces (API) is an open specification for developing 2D and 3D graphics software applications. There are three main profiles of the OpenGL specifications. OpenGL – desktop OpenGL ES – Embedded Systems OpenGL SC – Safety Critical From time to time the desktop OpenGL specification was updated to incorporate new extensions which are widely supported by Graphics Processing Unit (GPU) vendors reflecting new GPU capabilities. The embedded systems OpenGL specification branches from the desktop OpenGL specification less frequently and is tailored to embedded system needs. The safety critical OpenGL specification branches from the embedded systems OpenGL specifications and is further tailored for safety critical embedded systems. Figure 1 shows the high level relationship between the OpenGL specifications providing cross-platform APIs for full-function 2D and 3D graphics on embedded systems.
    [Show full text]
  • The Openvx™ Specification
    The OpenVX™ Specification Version 1.2 Document Revision: dba1aa3 Generated on Wed Oct 11 2017 20:00:10 Khronos Vision Working Group Editor: Stephen Ramm Copyright ©2016-2017 The Khronos Group Inc. i Copyright ©2016-2017 The Khronos Group Inc. All Rights Reserved. This specification is protected by copyright laws and contains material proprietary to the Khronos Group, Inc. It or any components may not be reproduced, republished, distributed, transmitted, displayed, broadcast or otherwise exploited in any manner without the express prior written permission of Khronos Group. You may use this specifica- tion for implementing the functionality therein, without altering or removing any trademark, copyright or other notice from the specification, but the receipt or possession of this specification does not convey any rights to reproduce, disclose, or distribute its contents, or to manufacture, use, or sell anything that it may describe, in whole or in part. Khronos Group grants express permission to any current Promoter, Contributor or Adopter member of Khronos to copy and redistribute UNMODIFIED versions of this specification in any fashion, provided that NO CHARGE is made for the specification and the latest available update of the specification for any version of the API is used whenever possible. Such distributed specification may be re-formatted AS LONG AS the contents of the specifi- cation are not changed in any way. The specification may be incorporated into a product that is sold as long as such product includes significant independent work developed by the seller. A link to the current version of this specification on the Khronos Group web-site should be included whenever possible with specification distributions.
    [Show full text]
  • 모바일 그래픽스 라이브러리들: 크로노스 그룹의 표준을 중심으로 Mobile Graphics Libraries: Focusing on the Standards from Khronos Group
    50 한국콘텐츠학회 제8권 제2호 모바일 그래픽스 라이브러리들: 크로노스 그룹의 표준을 중심으로 Mobile Graphics Libraries: focusing on the standards from Khronos Group 백낙훈 (경북대학교), 이환용 (㈜휴원 CTO, 경북대학교 박사과정) 차 례 1. 서론 2. OpenGL ES 3. OpenGL SC 4. OpenVG 5. 결론 1. 서론 전력 소모가 낮은 기기를 채택할 수 밖에 없는 것이다. 액정뿐만 아니라, 모든 컴퓨팅 자원들이 궁극적으로 전 컴퓨터는 그 출현 이후, 계속해서 그 크기를 줄여 왔고, 력 문제에 민감하여야 하고, 이 때문에, 제한된 기능만을 현재는 휴대폰, 네비게이터, 휴대용 게임기 등의 형태로 제공할 수 밖에 없는 상황이다. 모바일 컴퓨팅 환경을 제공하고 있다. 모바일 컴퓨팅 환 경의 대두와 함께, 이를 이용한 그래픽스 출력이 요구되 었고, 모바일 환경에서의 그래픽스 기능을 의미하는, 모 바일 그래픽스 환경이 구축되었다. 이 글에서는 현재의 모바일 그래픽스 환경 중에서도 특히 표준 라이브러리들 에 대해 이야기하고자 한다. 지난 10여년 사이에 모바일 그래픽스 분야는 눈부신 발전을 이루었다. 가장 대표적 인 기기인 휴대폰을 기준으로 본다면, 최초에 나온, 저해 상도에 흑백의 투박한 액정을 가진 모델이 불과 몇 년 사 이에 상당한 수준의 컬러 액정을 가진 제품으로 변했고, 3차원 그래픽스를 지원하는 특별한 하드웨어 칩들을 사 (a) 저해상도 2D (b) 3D 용하는 것도 이상하지 않은 상황이 되었다. 이에 따라, 소프트웨어 기술들도 눈부시게 발전하여, 그림 1에서 보 는 바와 같이, 2차원 저해상도에서 3차원 화면을 거쳐, 거의 PC 화면에 필적하는 수준의 고해상도 3차원 화면 이 급속히 사용되고 있다. 모바일 그래픽스 환경은 태생 상, 기존의 데스크 탑 또는 그 이상의 고급 기종들에 비 해, 상대적으로 열등한 하드웨어 환경을 제공할 수 밖에 없다. 가장 문제가 되는 것은 제한된 용량의 전원, 즉 배 터리의 수명을 고려해야 한다는 점이다. PC급의 고해상 (c) 하드웨어로 가속되는 3D 도 액정이 기술적으로 문제가 있는 것이 아니라, 채택하 ▶▶ 그림 1.
    [Show full text]
  • The Opengl ES Shading Language
    The OpenGL ES® Shading Language Language Version: 3.20 Document Revision: 12 246 JuneAugust 2015 Editor: Robert J. Simpson, Qualcomm OpenGL GLSL editor: John Kessenich, LunarG GLSL version 1.1 Authors: John Kessenich, Dave Baldwin, Randi Rost 1 Copyright (c) 2013-2015 The Khronos Group Inc. All Rights Reserved. This specification is protected by copyright laws and contains material proprietary to the Khronos Group, Inc. It or any components may not be reproduced, republished, distributed, transmitted, displayed, broadcast, or otherwise exploited in any manner without the express prior written permission of Khronos Group. You may use this specification for implementing the functionality therein, without altering or removing any trademark, copyright or other notice from the specification, but the receipt or possession of this specification does not convey any rights to reproduce, disclose, or distribute its contents, or to manufacture, use, or sell anything that it may describe, in whole or in part. Khronos Group grants express permission to any current Promoter, Contributor or Adopter member of Khronos to copy and redistribute UNMODIFIED versions of this specification in any fashion, provided that NO CHARGE is made for the specification and the latest available update of the specification for any version of the API is used whenever possible. Such distributed specification may be reformatted AS LONG AS the contents of the specification are not changed in any way. The specification may be incorporated into a product that is sold as long as such product includes significant independent work developed by the seller. A link to the current version of this specification on the Khronos Group website should be included whenever possible with specification distributions.
    [Show full text]