GLSL 3.30 - OpenGL

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3 Basics By default, compilers of this language must issue compile time syntactic, grammatical, and semantic errors for shaders that do not conform to this specification. Any extended behavior must first be enabled. Directives to control the behavior of the compiler with respect to extensions are declared with the #extension directive #extension extension_name : behavior #extension all : behavior where extension_name is the name of an extension. Extension names are not documented in this specification. The token all means the behavior applies to all extensions supported by the compiler. The behavior can be one of the following behavior require enable warn disable Effect Behave as specified by the extension extension_name. Give an error on the #extension if the extension extension_name is not supported, or if all is specified. Behave as specified by the extension extension_name. Warn on the #extension if the extension extension_name is not supported. Give an error on the #extension if all is specified. Behave as specified by the extension extension_name, except issue warnings on any detectable use of that extension, unless such use is supported by other enabled or required extensions. If all is specified, then warn on all detectable uses of any extension used. Warn on the #extension if the extension extension_name is not supported. Behave (including issuing errors and warnings) as if the extension extension_name is not part of the language definition. If all is specified, then behavior must revert back to that of the non-extended core version of the language being compiled to. Warn on the #extension if the extension extension_name is not supported. The extension directive is a simple, low-level mechanism to set the behavior for each extension. It does not define policies such as which combinations are appropriate, those must be defined elsewhere. Order of directives matters in setting the behavior for each extension: Directives that occur later override those seen earlier. The all variant sets the behavior for all extensions, overriding all previously issued extension directives, but only for the behaviors warn and disable. 10
3 Basics The initial state of the compiler is as if the directive #extension all : disable was issued, telling the compiler that all error and warning reporting must be done according to this specification, ignoring any extensions. Each extension can define its allowed granularity of scope. If nothing is said, the granularity is a shader (that is, a single compilation unit), and the extension directives must occur before any non-preprocessor tokens. If necessary, the linker can enforce granularities larger than a single compilation unit, in which case each involved shader will have to contain the necessary extension directive. Macro expansion is not done on lines containing #extension and #version directives. #line must have, after macro substitution, one of the following forms: #line line #line line source-string-number where line and source-string-number are constant integer expressions. After processing this directive (including its new-line), the implementation will behave as if it is compiling at line number line and source string number source-string-number. Subsequent source strings will be numbered sequentially, until another #line directive overrides that numbering. 3.4 Comments Comments are delimited by /* and */, or by // and a new-line. The begin comment delimiters (/* or //) are not recognized as comment delimiters inside of a comment, hence comments cannot be nested. If a comment resides entirely within a single line, it is treated syntactically as a single space. New-lines are not eliminated by comments. 11
Page 1 and 2: The OpenGL ® Shading Language Lang
Page 3 and 4: Table of Contents 1 Introduction...
Page 5: 7.2 Fragment Shader Special Variabl
Page 8 and 9: 1 Introduction ○ Layout qualifier
Page 10 and 11: 2 Overview of OpenGL Shading A frag
Page 12 and 13: 3 Basics 3.3 Preprocessor There is
Page 14 and 15: 3 Basics Preprocessor expressions w
Page 18 and 19: 3 Basics 3.5 Tokens The language is
Page 20 and 21: 3 Basics 3.7 Identifiers Identifier
Page 22 and 23: 4 Variables and Types Type uvec2 uv
Page 24 and 25: 4 Variables and Types 4.1.1 Void Fu
Page 26 and 27: 4 Variables and Types 4.1.4 Floats
Page 28 and 29: 4 Variables and Types 4.1.8 Structu
Page 30 and 31: 4 Variables and Types and as an alt
Page 32 and 33: 4 Variables and Types Within a decl
Page 34 and 35: 4 Variables and Types Initializers
Page 36 and 37: 4 Variables and Types For the inter
Page 38 and 39: 4 Variables and Types 4.3.7 Interfa
Page 40 and 41: 4 Variables and Types If an instanc
Page 42 and 43: 4 Variables and Types If an input v
Page 44 and 45: 4 Variables and Types Redeclaring g
Page 46 and 47: 4 Variables and Types Uniform block
Page 48 and 49: 4 Variables and Types The type and
Page 50 and 51: 4 Variables and Types precision pre
Page 52 and 53: 4 Variables and Types #pragma STDGL
Page 54 and 55: 5 Operators and Expressions 5.2 Arr
Page 56 and 57: 5 Operators and Expressions Some us
Page 58 and 59: 5 Operators and Expressions 5.4.4 A
Page 60 and 61: 5 Operators and Expressions 5.6 Mat
Page 62 and 63: 5 Operators and Expressions where t
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5 Operators and Expressions And mat
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6 Statements and Structure iteratio
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6 Statements and Structure • The
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6 Statements and Structure 6.3 Iter
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7 Built-in Variables 7.1 Vertex and
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7 Built-in Variables The output var
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7 Built-in Variables If a shader ex
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7 Built-in Variables 7.4.1 Compatib
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7 Built-in Variables // // compatib
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7 Built-in Variables The following
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8 Built-in Functions The OpenGL Sha
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8 Built-in Functions Syntax genType
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8 Built-in Functions 8.5 Matrix Fun
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8 Built-in Functions 8.7 Texture Lo
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8 Built-in Functions Syntax int tex
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8 Built-in Functions Syntax gvec4 t
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8 Built-in Functions Syntax vec4 sh
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8 Built-in Functions 8.9 Noise Func
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9 Shading Language Grammar The gram
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9 Shading Language Grammar function
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9 Shading Language Grammar logical_
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9 Shading Language Grammar init_dec
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9 Shading Language Grammar UINT BOO
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9 Shading Language Grammar struct_d
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9 Shading Language Grammar for_init
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GLSL 3.30 - OpenGL

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