Plugin to perform easy sign extension in cleo scripts.
Find a prebuilt signext.cleo in the bin folder.
Put this at the top of your script (along with other sannybuilder macros):
{$O 0C26=2,sign_extend %1d% store_to %2d%}
This lets sannybuilder know an additional opcode 0C26 exists so it will know what to do when compiling.
Then you can call it like any other opcode:
0C26: sign_extend 1@ store_to 2@
What this does: it converts a 2-byte int to a 4-byte float and divides the value by 8 (because this is how R* stores some coordinates (e.g. for pickups) to save some memory).
This was used in the snapshots esp CLEO script as (snapshot) pickup XYZ locations are saved in memory as 2-byte ints (and divided by 8), and we need to work with 4 byte values in the script.
After a while I did find a way to do this in plain CLEO, which means this plugins isn't used for that anymore.
This can be still usefull if you don't mind the dependency on this plugin so you don't have to bother with sign extension in your CLEO code (or if you simply don't have any spare local variables :p).
Eventually I found out how to do it without plugins (I kept forgetting about the 2-complement thing when I first searched for it).
// 1@ is input (and output)
// 2@ is a temp variable (not used for positive values)
:SIGNEXT
08B7: test 1@ bit 15
004D: jump_if_false @SIGNEXT2
0006: 2@ = 15
:SIGNEXT0
000A: 2@ += 1
08BF: set 1@ bit 2@
0019: 2@ > 31
004D: jump_if_false @SIGNEXT0
:SIGNEXT2
0093: 1@ = integer 1@ to_float
return