mm_alex

this works quite well, and does not necessarily require any NN/machine learning. see the youtube for this paper https://www.disneyresearch.com/publication/scenespace/ tldr simple brute force weighted average of samples from many frames, combined with a noisy/low quality depth-from-motion estimate can be used to de-noise, increase resolution and otherwise manipulate video footage. very cool paper with great results from a simple technique.

LittleBigPlanet, our PS3 game, was (is) called 'ps3test1'. the sequel, LBP2, is... also called ps3test1. that project really was our first attempt to bring up a devkit, probably with a rotating cube.

the project, and compiled output, on every platform, is called 'pc.elf' (or .vcproj or .exe or whatever) SIGH

there's an inverse correlation between awesome-ness of directory name and chance-of-shipping, in my experience.

Imma just gonna leave this here: http://hulkholden.github.com/n64js/ fully functioning n64 emulator in javascript, which dynamically recompiles mips asm to js so that your browser can JIT it into native code. the dev blog is full of amazing js perf knowledge too: http://n64js.blogspot.co.uk/ (videos here also if you dont have any roms to hand)

source code on github. full disclosure: I work with paul, he's very clever.

surprised all the comments here are about whether he achieved compression or not. Point = Missed!

the entire thing was an ingenious trolling exercise, as he says, to 'out trick the trickster'. his goal was to exploit the loose wording of the challenge, and prove a point (possibly winning $5k in the process); I found it an entertaining story along those lines.

it proves nothing (new) about compression, or lack of it; he even stats that the consensus at the time was 'unanimous' that no compression had taken place. that's not where the interest in this link/story lies.

thanks for the original link, OP.

reminds me of Bob Jenkins' (of hash function fame) comments on his resume [1]:

IBM (1988) ... The existing code tended to shrink when I edited it. I wrote a total of minus 5000 lines of code that summer.

Oracle (1989-2006) Oracle's code (C and PL/SQL) is very good. It usually didn't shrink when I edited it.

[1] http://burtleburtle.net/bob/other/resume3.html

I dunno about hurt blah blah blah but could you explain how exactly the 'modern API choices' provide 'GPU-raytraycing almost out-of-the-box'? if you search for ray tracing in opengl/directx/webgl, you will find no mention of ray-tracing, and for good reason: they don't provide it 'out of the box'.

The ray tracing going on in this demo has nothing to do with the APIs he is using; indeed, that demo could be implemented, pixel perfect, on any platform with floating point arithmetic. it just uses the 'advanced api' to display the resulting image on the screen...

now, the point you make is still a valid one, in that we have more api's than before, but this demo is not an example of using such apis. Better 'grey area 4k' examples that would support your point, are the ones that (for example), loaded the general midi file from windows, and used it as a source of samples (that was a trend a few years ago); or the ones that make use of D3DX's truetype font->extruded mesh routine, to create almost all their geometry out of extruded Arial letters. In both cases, these are such ingenious hacks that despite being in the 'grey area', and definitely (ab)using data available in the host OS, they represent such crazed creativity you can't help but admire them.

either way, such tricks were not used here; you're just seeing the result of a very large number of multiply-add instructions, artfully composed; and that's nothing to do with 'demo producers making more and more API choices'

I understand why this always comes up, but in this particular case it's particularly 'un-useful'. I can tell you exactly what API calls he makes: on boot he makes API calls the equivalent of PlayGigantic3MinuteWav(), InitOpenGL(), Compile2Shaders(), and then each frame he calls DrawFullScreenQuad() (twice, once to an offscreen texture, once to the screen), and Flip().

All the magic of the demo is in the synth (pure x86 fpu code) for the music, and the sphere tracer / camera choices / colors / fractal equation, for which precisely 0 'API' is used.

Put another way, the really amazing thing these days is that we have hardware (cpu, gpu) capable of so many FLOPS that you can do brute force things like sphere tracing complex fractals. the goal, seen in this light, of the demoscene, is to expose the wonder of all that power in visually interesting or arty ways.

Seriously, you couldn't have picked a worse example of someone 'leaning on an api'. :)

it would be interesting to use a colour gradient (say from yellow to red) to indicate how long something survived, before it got deleted. so you could see immediately the different kinds of mistake - transitory ones, or stuff that took you a while to realise.

<ramble> true, true! and I apologise for sounding whingey before, I do not mean to rag on you or the OP (I know nothing about what is good/idiomatic haskell and how that relates to efficient haskell). but it still feels damn slow, multiple seconds to make that image!

to put money where my (gut's?) mouth is, the dumb transliteration of my webgl shader to C++, compiled by MSVC in release mode on my win32 machine, takes 100ms to compute a frame at 800x600, on a single core, with precisely no tuning or effort.

with #pragma omp magic, equivalent in pain to the OP's point about almost-free-parallelisation in ghc, I imagine that would drop to around 20ms on 8 cores. and if I used an SSE vector class, probably another 2x, but that could legitimately be disallowed as overly complex.

my point being, you're right, GPUs stomp over CPUs for this kind of work! but my gut told me that this image should not take long for 'even' a CPU to produce; 10 or 20ms without effort, sub millisecond with effort (bytes rather than floats, asm, etc)

maybe I'm just lamenting the abuse of our modern CPUs, which are fantastically fast machines, even for stuff that they are not designed to excel at, like this. </ramble>

done! paste this [1] into shadertoy (and I de-lurked on HN after 3 years to do this; who knew) nice effect, but it pains me that a multicore cpu implementation can be SO SLOW. modern pc's are fast, you know? not just the gpu... oh well.

[1] https://gist.github.com/f448ba84e94c61ab5924