GameMaker [SOLVED] using negative offset to read from buffer_wrap

[TomSinister]

I was wondering if it was possible to use a negative offset to read values from a buffer_wrap. As an example, say I want to read data from 10 positions behind a buffer_wrap current "seek" position (seek - 10) with the buffer_peek command. If the current seek position is less than 10, will the buffer_read command then wrap around and read from the end of the buffer? or will it cause a compile error?

If this feature is not available in GMS2, I think I can write a workaround by checking to see if the solution to (seek - 10) is negative, and if it is I can add the total size of the buffer to the negative answer, which will result in the same sort of wrapping I am hoping for.

 

[Binsk]

Try it and see.

 

[TheouAegis]

If it errors, then fetch the buffer length first then get the modulo.

 

[NightFrost]

GML modulo is useless for wraparound counters as it doesn't play by Euclidean division. Taking -2 mod 10 won't give 8 but -2. (So you can't make fast angle changer either by doing angle = (angle + angle_change) mod 360.)

 

[TheouAegis]

Well then (pos+length) mod length.

Yeah I keep forgetting about that stupid error with negative numbers. Always works on my windows calculator but never in GM. Lol

 

[TomSinister]

Well then pos+length mod length.

Yeah I keep forgetting about that stupid error with negative numbers. Always works on my windows calculator but never in GM. Lol

Awwwwwww yeaaaaah! this is what i was looking for. Nice, clean solution that i can slap into my if statements, thanks for the help, folks!