GLSL 3.30 - OpenGL

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4 Variables and Types 4.1.1 Void Functions that do not return a value must be declared as void. There is no default function return type. The keyword void cannot be used in any other declarations (except for empty formal or actual parameter lists). 4.1.2 Booleans To make conditional execution of code easier to express, the type bool is supported. There is no expectation that hardware directly supports variables of this type. It is a genuine Boolean type, holding only one of two values meaning either true or false. Two keywords true and false can be used as literal Boolean constants. Booleans are declared and optionally initialized as in the follow example: bool success; // declare “success” to be a Boolean bool done = false; // declare and initialize “done” The right side of the assignment operator ( = ) must be an expression whose type is bool. Expressions used for conditional jumps (if, for, ?:, while, do-while) must evaluate to the type bool. 4.1.3 Integers Signed and unsigned integer variables are fully supported. In this document, the term integer is meant to generally include both signed and unsigned integers. Unsigned integers have exactly 32 bits of precision. Signed integers use 32 bits, including a sign bit, in two's complement form. Operations resulting in overflow or underflow will not cause any exception, nor will they saturate, rather they will “wrap” to yield the low-order 32 bits of the result. Integers are declared and optionally initialized with integer expressions, as in the following example: int i, j = 42; // default integer literal type is int uint k = 3u; // “u” establishes the type as uint 18
4 Variables and Types Literal integer constants can be expressed in decimal (base 10), octal (base 8), or hexadecimal (base 16) as follows. integer-constant : decimal-constant integer-suffix opt octal-constant integer-suffix opt hexadecimal-constant integer-suffix opt integer-suffix: one of u U decimal-constant : nonzero-digit decimal-constant digit octal-constant : 0 octal-constant octal-digit hexadecimal-constant : 0x hexadecimal-digit 0X hexadecimal-digit hexadecimal-constant hexadecimal-digit digit : 0 nonzero-digit nonzero-digit : one of 1 2 3 4 5 6 7 8 9 octal-digit : one of 0 1 2 3 4 5 6 7 hexadecimal-digit : one of 0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F No white space is allowed between the digits of an integer constant, including after the leading 0 or after the leading 0x or 0X of a constant, or before the suffix u or U. When the suffix u or U is present, the literal has type uint, otherwise the type is int. A leading unary minus sign (-) is interpreted as an arithmetic unary negation, not as part of the constant. It is an error to provide a literal integer whose magnitude is too large to store in a variable of matching signed or unsigned type. 19
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 16 and 17: 3 Basics By default, compilers of t
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 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
Page 64 and 65: 5 Operators and Expressions • The
Page 66 and 67: 5 Operators and Expressions And mat
Page 68 and 69: 6 Statements and Structure iteratio
Page 70 and 71: 6 Statements and Structure • The
Page 72 and 73: 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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