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The OpenGL

Shading Language

Language Version: 4.30

Document Revision: 6

3-Aug-2012

Editor: John Kessenich, LunarG

Version 1.1 Authors: John Kessenich, Dave Baldwin, Randi Rost

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 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

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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

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no, and expressly disclaims any, warranties, express or implied, regarding the correctness, accuracy,

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Khronos, OpenKODE, OpenKOGS, OpenVG, OpenMAX, OpenSL ES and OpenWF are trademarks of

the Khronos Group Inc. COLLADA is a trademark of Sony Computer Entertainment Inc. used by

permission by Khronos. OpenGL and OpenML are registered trademarks and the OpenGL ES logo is a

trademark of Silicon Graphics Inc. used by permission by Khronos. All other product names, trademarks,

and/or company names are used solely for identification and belong to their respective owners.

Table of Contents

1 Introduction.................................................................................................................................1

1.1 Acknowledgments................................................................................................................2

1.2 Changes................................................................................................................................3

1.2.1 Summary of Changes from Version 4.20.....................................................................3

1.3 Overview..............................................................................................................................5

1.4 Error Handling......................................................................................................................5

1.5 Typographical Conventions.................................................................................................5

1.6 Deprecation..........................................................................................................................5

2 Overview of OpenGL Shading....................................................................................................6

2.1 Vertex Processor..................................................................................................................6

2.2 Tessellation Control Processor.............................................................................................6

2.3 Tessellation Evaluation Processor........................................................................................7

2.4 Geometry Processor.............................................................................................................7

2.5 Fragment Processor..............................................................................................................7

2.6 Compute Processor...............................................................................................................7

3 Basics..........................................................................................................................................9

3.1 Character Set........................................................................................................................9

3.2 Source Strings......................................................................................................................9

3.3 Preprocessor.......................................................................................................................10

3.4 Comments..........................................................................................................................15

3.5 Tokens................................................................................................................................16

3.6 Keywords............................................................................................................................16

3.7 Identifiers...........................................................................................................................18

3.8 Definitions..........................................................................................................................18

3.8.1 Static Use....................................................................................................................19

3.8.2 Uniform and Non-Uniform Control Flow..................................................................19

3.8.3 Dynamically Uniform Expressions.............................................................................19

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

iii

4.1.7.3 Atomic Counters.................................................................................................29

4.1.8 Structures....................................................................................................................29

4.1.9 Arrays.........................................................................................................................30

4.1.10 Implicit Conversions................................................................................................34

4.1.11 Initializers.................................................................................................................35

4.2 Scoping...............................................................................................................................37

4.3 Storage Qualifiers...............................................................................................................40

4.3.1 Default Storage Qualifier............................................................................................41

4.3.2 Constant Qualifier......................................................................................................41

4.3.3 Constant Expressions.................................................................................................41

4.3.4 Input Variables...........................................................................................................42

4.3.5 Uniform Variables......................................................................................................45

4.3.6 Output Variables.........................................................................................................45

4.3.7 Buffer Variables.........................................................................................................47

4.3.8 Shared Variables.........................................................................................................48

4.3.9 Interface Blocks..........................................................................................................48

4.4 Layout Qualifiers................................................................................................................52

4.4.1 Input Layout Qualifiers...............................................................................................53

4.4.1.1 Tessellation Evaluation Inputs............................................................................55

4.4.1.2 Geometry Shader Inputs......................................................................................56

4.4.1.3 Fragment Shader Inputs......................................................................................57

4.4.1.4 Compute Shader Inputs.......................................................................................58

4.4.2 Output Layout Qualifiers............................................................................................59

4.4.2.1 Tessellation Control Outputs..............................................................................61

4.4.2.2 Geometry Outputs...............................................................................................61

4.4.2.3 Fragment Outputs...............................................................................................63

4.4.3 Uniform Variable Layout Qualifiers...........................................................................64

4.4.4 Subroutine Function Layout Qualifiers......................................................................65

4.4.5 Uniform and Shader Storage Block Layout Qualifiers...............................................66

4.4.6 Opaque-Uniform Layout Qualifiers............................................................................68

4.4.6.1 Atomic Counter Layout Qualifiers.....................................................................69

4.4.6.2 Format Layout Qualifiers....................................................................................70

4.5 Interpolation Qualifiers......................................................................................................72

4.5.1 Redeclaring Built-in Interpolation Variables in the Compatibility Profile.................73

4.6 Parameter Qualifiers...........................................................................................................74

4.7 Precision and Precision Qualifiers.....................................................................................74

4.7.1 Range and Precision...................................................................................................74

4.7.2 Precision Qualifiers....................................................................................................75

4.7.3 Default Precision Qualifiers.......................................................................................76

4.7.4 Available Precision Qualifiers....................................................................................77

4.8 Variance and the Invariant Qualifier..................................................................................77

4.8.1 The Invariant Qualifier...............................................................................................77

4.8.2 Invariance of Constant Expressions...........................................................................78

4.9 The Precise Qualifier..........................................................................................................78

4.10 Memory Qualifiers...........................................................................................................81

4.11 Order of Qualification......................................................................................................84

5 Operators and Expressions........................................................................................................85

5.1 Operators............................................................................................................................85

5.2 Array Operations...............................................................................................................86

5.3 Function Calls....................................................................................................................86

5.4 Constructors.......................................................................................................................86

5.4.1 Conversion and Scalar Constructors..........................................................................86

5.4.2 Vector and Matrix Constructors.................................................................................87

5.4.3 Structure Constructors................................................................................................89

5.4.4 Array Constructors.....................................................................................................90

5.5 Vector and Scalar Components and Length.......................................................................90

5.6 Matrix Components............................................................................................................92

5.7 Structure and Array Operations..........................................................................................92

5.8 Assignments.......................................................................................................................93

5.9 Expressions........................................................................................................................94

5.10 Vector and Matrix Operations..........................................................................................97

5.11 Out-of-Bounds Accesses..................................................................................................98

6 Statements and Structure...........................................................................................................99

6.1 Function Definitions.........................................................................................................100

6.1.1 Function Calling Conventions..................................................................................103

6.1.2 Subroutines...............................................................................................................104

6.2 Selection...........................................................................................................................105

6.3 Iteration............................................................................................................................106

6.4 Jumps................................................................................................................................107

7 Built-in Variables....................................................................................................................109

7.1 Built-In Language Variables............................................................................................109

7.1.1 Compatibility Profile Built-In Language Variables..................................................118

7.2 Compatibility Profile Vertex Shader Built-In Inputs.......................................................121

7.3 Built-In Constants............................................................................................................122

7.3.1 Compatibility Profile Built-In Constants..................................................................123

7.4 Built-In Uniform State.....................................................................................................124

7.4.1 Compatibility Profile State.......................................................................................124

8 Built-in Functions...................................................................................................................128

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可爱多001

2015-03-06

不错，很实用
gougoudexili

2014-08-12

资源很好有用感谢楼主

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