Mhmm seems like a good deal Make sure the slow one is signifiantly slower too, like, 3x slower or something like that, so we distinguish them easier

Screen?

I have it as 4 times slower, and it is looking good ^^

Ok seems fine ^^

That sucks , is there a way to maybe adapt the engine for division by 4 or 8 so you can do /2/2/2? I assume this would probably require heavy modification, though . Don't use 8x8 sprites, tho.

When you do this:

{E/5*16+(D/5)+L4}

You can do half as many divisions by combining them first then dividing:

{E*16+D/5+L4}

Depends on how big E is already though, if its always less than 4096 then you can.

Mmm, I don't think that would work, since E/5*16 and E*16/5 will give different results due to truncation

Hmm, if you are doing D/5 and E/5 a lot, you could calculate each of them once and store to temporary vars, perhaps?

Well, that piece of code that Quigibo posted is the heart of my tilemap detection.  It takes a coordinate on screen and finds the tile that it resides in.  Since its used in collision code, that means its called many times each frame, and all with unique values.

Hmmmm but then it becomes tricky to move any object by a single pixel, since your coordinate plane is not evenly divided.  I think i have a way to make it work however by storing the tile data in a different way.  It will take up a tiny bit more memory, but it should not be too bad.

EDIT: Okay 4x4 tiles is officialy not going to work.  After a quick conversion i realized that while the tiles are smaller, it actually leaves me less room to make maps, since corridor would need to be 2 tiles wide (since the character is 5 pixels wide, and it will not be changed).  SO that means that i will try to use Calc84's option, but i will have to write a separate collision sub for the portal gun, which needs to be able to move pixel by pixel.  With so many more objects being added, such as boxes, plasma balls, and other collision things, there is going to be a lot of collision, and therefore it needs to be as fast as possible.