Shadershow::script

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The scripting syntax resembles that of JS/GLSL/C/Java but the interpretation is not too closely related to any of them .

The formal syntax is:

• list = <assign> | <list> , <assign>
• args = <assign> | <args> , <assign>
• bif = <bifIdentifier> "(" <args>? ")"
• primexpr = "(" <assign> ")" | "[" <list>? "]" | <bif> | <number> | <identfier>
• negation = - <negation> | <primexpr>
• mulexpr = <primexpr> | <mulexpr> [*/%] <primexpr>
• addexpr = <mulexpr> | <addexpr> [+-] <mulexpr>
• assign = <identifier> "=" <assign> | <addexpr>

So the following expressions are valid:

• "a=12.3" assigns a to 12.3
• "b=[4,5+a]" assigns b to the list [ 4 , 5+a ], ie a list containing 2 values.
• "c=lin(0,1)" interpolates c between 0 and 1 in the assigned timespan (lin is a built in function that linearly interpolates between the values given during the time span it is specified over)

Many expressions (and functions) supports lists as input and automatically "vectorizes" the calculations like GLSL does. So if you have the function "d=lin([0,1],[20,30])" then d will be an list where the first value is interpolated between 0 and 20 and the second value interpolated between 1 and 30.

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The implemented numeric operators are + - * / % and operates on numbers or lists.
built in functions consists right now only of "lin" that linearly interpolates between the first and second argument.