Perlin noise generation in Lua/Löve?

[middlerun]

Here's a thing I whipped up in the last few hours for generating terrain with 2D Perlin noise. Warning: pretty slow. Press r to regenerate terrain or p to see the unprocessed Perlin noise.

EDIT: Fixed bug.

[kikito]

I always applaud all things procedural.

<aplause>

BTW, mddlerun's demo just gives me a black screen. LÖVE 0.7.2 stable, ubuntu.

[middlerun]

Are you running on a slow computer or anything? It can take a long time to generate the Perlin noise, about five seconds on my computer. It's probably not the most efficient code.

[slime]

It works for me.

You should use the simplex noise generator that works with LuaJIT though, it's much more efficient.

[kikito]

Are you running on a slow computer or anything? It can take a long time to generate the Perlin noise, about five seconds on my computer. It's probably not the most efficient code.

I tried a second time and it worked. Mistery.

And for the record, my computer is a beast (bought it like 2 months ago)

[sentry]

wow.. Running "perlin-terrain.love" with LuaJIT makes you realise how fast it is compared to regular lua.

[Elvashi]

wow.. Running "perlin-terrain.love" with LuaJIT makes you realise how fast it is compared to regular lua.

actually, its just that this sort of thing is pretty much the ideal case for JIT in general. Other cases are sufficiently pathological that luaJIT's response is to...not jit them

iow, everything has its strengths and weaknesses, this happens to be JITs strength.

[slime]

wow.. Running "perlin-terrain.love" with LuaJIT makes you realise how fast it is compared to regular lua.

actually, its just that this sort of thing is pretty much the ideal case for JIT in general. Other cases are sufficiently pathological that luaJIT's response is to...not jit them

iow, everything has its strengths and weaknesses, this happens to be JITs strength.

It would be much faster under LuaJIT if it used LuaJIT's FFI (like the one I linked).

[Taehl]

Here's a very cheap-but-quick 1D implementation I just whipped up. It even lets you specify the granularity of each pass (the little tables I pass the function) (hence, each line has a different style) and whether to use linear or cosine interpolation. Hold any key except Esc to constantly churn out three 800-point lines at blazing speed.

http://dl.dropbox.com/u/3713769/web/Love/perlin.love

[tentus]

You guys this is so cool. We need another procedural contest.