What is the implementation for Starcraft II's RandomInt() function?

[RueBlaja]

It isn't equivalent to any of the standard rand() functions, as far as I can tell. Has anyone been able to figure out how it's implemented?

[Beaving]

Find any variable with constant random integers and just BP it for write access.

[Mr Nukealizer]

So, are you talking about the Galaxy function that gets a random number in a range, or something else?

[RueBlaja]

Yeah, the Galaxyscript function (if anyone could find the ASM I'd be content, I could reverse engineer it from there. I'm just having trouble finding the actual code)

[Mr Nukealizer]

The main code is at 0x00DDED40. It calls 0x00E21590, and 0x0093D2C0 which calls 0x0093D170 and 0x01069120.

[RueBlaja]

Awesome, thanks! I had just figured that out when you posted it, but it took me literally about 6 hours. Out of curiosity, how did you find that so quickly?

I got it all implemented now, but because it uses the assembly code directly from the game, I can't publish it. However, if anyone in the future wants help figuring it out for themselves, I'd be more than happy to help, just shoot me a message.

Thanks again Mr. Nukealizer!

[Mr Nukealizer]

Awesome, thanks! I had just figured that out when you posted it, but it took me literally about 6 hours. Out of curiosity, how did you find that so quickly?

I got it all implemented now, but because it uses the assembly code directly from the game, I can't publish it. However, if anyone in the future wants help figuring it out for themselves, I'd be more than happy to help, just shoot me a message.

Thanks again Mr. Nukealizer!

I managed to find it so fast by opening the program in IDA Pro and running the script for finding and renaming all the Galaxy functions (it's on Blizzhackers somewhere...), then opening the Goto window and typing in Galaxy_RandomInt.

And by the way, I wasn't working on it the whole 3 hours between our posts, it only took about 45 seconds to find it and another 5 minutes to find the addresses it calls and write my post.

[RueBlaja]

it only took about 45 seconds

poker_face_meme.jpg

For future reference for everyone else, apparently that script can be found here.