Difference between revisions of "0x0002"
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The structure (with the exception of the as yet unknown bytes) is also fairly simple. We will use the following example instruction to explore the structure further: | The structure (with the exception of the as yet unknown bytes) is also fairly simple. We will use the following example instruction to explore the structure further: | ||
| − | + | op1, op2, op3, op4, op5, op6, op7, op8 | |
| + | un1, un2, un3, un4, un5, un6, un7, un8 | ||
Example: | Example: | ||
| − | + | 00, 00, 00, 00, 00, 05, 19, 09 | |
| + | 00, 00, 00, 00, 00, 00, 00, 00 | ||
| − | + | The 8 Unknown bytes (un1 - un8) will not be discussed as they do not appear to be used directly by the 0x0002 instruction. | |
| − | + | ||
| − | The 8 Unknown bytes (un1 - un8) will | + | |
This only leaves us with the 8 ops (op1 - op8), which break down as follows: | This only leaves us with the 8 ops (op1 - op8), which break down as follows: | ||
Revision as of 13:29, 21 June 2006
Contents |
Primitive 0x0002
For those familiar with TS1 modding, there is nothing new here. This page is designed primarily for the newcomer who does not have any previous experience with SimAntics.
Overview
This is by far the most used BHAV operation and, therefore, one of the first an aspiring behavioral modder should learn. At its heart, Expression is a fairly simple instruction, taking two items and performing a logical comparison or mathematical calculation with them.
Structure
The structure (with the exception of the as yet unknown bytes) is also fairly simple. We will use the following example instruction to explore the structure further:
op1, op2, op3, op4, op5, op6, op7, op8 un1, un2, un3, un4, un5, un6, un7, un8
Example:
00, 00, 00, 00, 00, 05, 19, 09 00, 00, 00, 00, 00, 00, 00, 00
The 8 Unknown bytes (un1 - un8) will not be discussed as they do not appear to be used directly by the 0x0002 instruction.
This only leaves us with the 8 ops (op1 - op8), which break down as follows:
- op6 is the Operator, which tells the game which mathematical/logical operation to perform
- op7 is the first (or left-side) Operand
- op1 and op2 are read together as a single little-endian short. It is an argument for the first Operand
- op8 is the second (or right-side) Operand
- op3 and op4 are read together as a single little-endian short. It is an argument for the second Operand
- op5 was never completely understood in TS1. Either it is some type of flag or is unused.
So in our example instruction:
- the Operator is 0x05 (assign to)
- the first Operand is 0x19 (local variable)
- which has an argument of 0x00 (numeric 0)
- the second Operand is 0x09 (parameter)
- which has an argument of 0x00 (numeric 0)
Our instruction would therefore be read as "local variable 0x0 := parameter 0x0". In simpler terms, this means "the value for local variable 0x0 := the value listed in parameter 0x0"
See also
This article is imported from the old MTS2 wiki. It's original page, with comments, can be found at http://old_wiki.modthesims2.com/0x0002]
