Here's a rotozoomer...

[Dr_D]

I don't know if anyone needs it or not, but most of it's programmed inline x86 asm. There is a known bug when drawing to another fb.image, but we'll get that fixed asap.

rotozoom

[Shockwave]

Thats nice and fast Dr.D

And it has source code too which could be helpful for people who want to load Bitmaps.

Thanks

[Dr_D]

Thanks Shockwave. That previously mentioned bug has been removed as well.

[benny!]

Indeed. Well done, Dr_D

[rdc]

That's cool stuff, as always. Thanks!

[Jim]

Thanks Dr_D.  Would be interesting to compare what Freebasic compiler generates compared with hand optimised stuff.

Jim

[Dr_D]

Well, we did some stuff like leaving a few vars that get used a lot on the fpu stack. I can't be sure, but I don't think fb does that. I haven't looked at the asm fb generates for it normally, but that's an interesting idea! This one is quite a bit faster than one programmed directly in fb code though.

[hellfire]

I had a quick look at your source, some points that can be improved:
Bubble-sort is not a particularly fast way to pick the minimum/maximum from 4 values.
You're much faster by using integer coordinates for interpolation, the fpu just requires permanent "fisting".
Don't test every texel if it's inside texture-boundaries:
You can test where the current scanline enters/leaves the valid range and skip the according amount of pixels (or use a polygon) which makes the innerloop end up in just a few instructions.
You don't need a multiplication to build a texel's address:
"my" always increasing by the integer-part of "tsdzx" or one more if the fractional part causes an overflow. So you can pick the value from a table according to the carry flag (see here).

[matthew]

Very nice & thanks for including the source. 

[Clyde]

Neat Dr_D, must of taken abit of doing.

Cheers And K++,
Clyde.

[Shockwave]

I can't seem to invoke the bug that you said was in the first version, where was it exactly?
It worked fine here.

[Dr_D]

Well, the fb.image structure now has pitch. We weren't taking that into consideration before, which caused errors when drawing to odd sized windows/images. It should be all good now though.

[Shockwave]

I see

Next things to do is add a scroller and a song