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This kind of strings is only supported by Sanny Builder.
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SA scripting engine also has data type 15 that denotes the short string containing up to 15 symbols. When compiled such strings occupy 8 bytes of a SCM file no matter if the string is actually shorter (the rest of bytes is filled with zero bytes). Maximum symbols it could contain is 7 and the last one (8th) is a null terminator byte. The term short means that this string is strongly limited to its length. This is the most common type of a string, that is used in every game since GTA III. Also, no matter with what symbol a string begins. GTA has no limits on what symbols could or could not be used in the strings. Those including Template:Hint, Template:Hint, some other chars like Template:Hint or Template:Hint. The parameters could be one of following kinds:
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If the script contains another number of parameters it causes a crash. The game engine knows amount of parameters for each opcode (,, 13 for 014B, etc). Then cast this array as a float and that's it.
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To get the value of a packed float, read the needed amount of bytes (1, 2 or 3) from a scm to a byte array starting from the 3rd, 2nd or 1st element of it respectively. Some data types itself are the names of variables. The floating-point values are packed (1, 2 or 3 bytes of length instead of common 4). For example, data type 01 is a value of 0, data type 02 - 0.0, etc. First of all, many data types itself denote an immediate value. Immediate varlen string - first you read 1 byte which gives you length of the rest which is text Īs it might be seen from the table two bytes Template:Hint could have 3 different meanings as a parameter: if it's preceded by a data type of 2 it is a global variable ( $2), data type of 3 – local variable ( data type of 5 - 16-bit number ( 2), so only the data type allows the game to determine the correct parameter meaning.ĭata types for Liberty City Stories and Vice City Stories are much different. The purpose of it is to tell to the game how much bytes to read next and what kind of data it is.Įnd of argument list ( 004F, 0913 and similar) ĭata type is a single byte written before any parameter. The original unmodded game supports a way smaller amount of opcodes (maximum 0A4E for San Andreas), but there are tools adding new ones, most notably CLEO library.Īfter an opcode number the data types and parameter values follow. However due to a specific of the SCM language, any numbers above 0x7FFF denote negative conditional opcodes. It means the minimum opcode is 0000 and maximum opcode is 0xFFFF. The game does not know what the word wait means, but it knows what the opcode 0001 is, so when a mission script is assembled the commands are written back in raw byte form.Īs it has been said, an opcode is UINT16 number. This is made for the end-user convenience only. The example above will look something like this: When a mission script is disassembled, opcodes are written in a human-readable format.
#First person cleo scripts for gta sa code#
Sometimes the whole script instruction is called opcode.Įach script instruction is represented by a number called operation code which is implemented using an 16 bit unsigned integer. An instruction consists of an opcode and its parameters (if there are any). Template:Hint Template:Hint Template:Hint Template:Hint Template:HintĪ SCM file itself is a bytecode containing instructions telling to the game what to do. Template:Hint Template:Hint Template:Hint This is how the beginning of the San Andreas mission script looks like: The equivalent in the main.scm would look something like this:ĭ6 00 04 00 19 01 02 45 0E 4D 00 01 FE 3D 87 02 A6 00 02 45 0E The majority of the mission script comes in a file called main.scm (although in San Andreas there are alternate mains and external scripts, but they all follow the same basic format - hex codes). However, very little code came with the game like that. The original mission script probably looked something like this (taken from Vice City debug.sc file):Įasy to read and understand, it is fairly basic so anyone with an idea of basic coding (or maybe even English) can understand it.