gaseous-giganticus
coreutils
gaseous-giganticus | coreutils | |
---|---|---|
18 | 112 | |
109 | 4,036 | |
- | 1.4% | |
5.3 | 9.3 | |
5 months ago | 1 day ago | |
C | C | |
GNU General Public License v3.0 only | GNU General Public License v3.0 only |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
gaseous-giganticus
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Simulating Fluids, Fire, and Smoke in Real-Time
I think the curl noise paper is from 2007: https://www.cs.ubc.ca/~rbridson/docs/bridson-siggraph2007-cu...
I've used the basic idea from that paper to make a surprisingly decent program to create gas-giant planet textures: https://github.com/smcameron/gaseous-giganticus
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Friday Post: What is something you made or solved in C that you are proud off?
Gaseous-giganticus - procedurally generates gas giant planet textures for space games, etc.
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How can I generate realistic planetary cloud cover?
This is what gaseous-giganticus uses. Combined with some other techniques, it can help with making some clouds for earthlike planets, but not in real time. Mentioned here previously. The process I use for making earthlike planets with clouds for Space Nerds in Space is described here.
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Procedural Gas Giant
Here's my own gas giant thingy, which produces (what I imagine to be) decent results, but is quite slow.
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How do i use/compile gaseous giganticus?
Hi. I'm the author of gaseous-giganticus. You do not need to apply the patch, as it was incorporated into the source already a long time ago: https://github.com/smcameron/gaseous-giganticus/commit/b3ca95f2f3975d6ca97029dae166e2daf068b3f0
- Ask HN: What is the most impactful thing you've ever built?
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Aside from hobby and practice, what are some genuinely useful personal apps?
I needed some gas giant textures for planets in my space game so I made this thing, which also ended up getting used by other people for their Kerbal Space Program mods.
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Empyrion -- Galactic Survival - #3 by pavloocheretianyi01 on DeviantArt
Is that gaseous-giganticus output that I spy?
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Best (preferably free) procedural planet texture generators
I've made a couple. For gas giants, gaseous-giganticus. For earthlike, or rocky planets, there's a program called "earthlike.c" in the space-nerds-in-space repo. Other than allowing you to supply an input image to use more or less as a color palette, they don't allow much in terms of customization, though there are quite a few knobs you can turn.
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What is your best project using C?
Most innovative thing, or what I'm most astonished I actually successfully pulled off against all odds, is probably gaseous-giganticus, which is a program that uses curl noise for procedural fluid flow(pdf) on the surface of a sphere to create cubemap textures for procedurally generated gas giant planets.
coreutils
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GNU Coreutils 9.5 Can Yield 10~20% Throughput Boost For cp, mv and cat Commands
https://github.com/coreutils/coreutils/commit/fcfba90d0d27a1...
A summary of other changes just released in GNU coreutils 9.5 are:
* mv accepts --exchange to swap files
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How the GNU coreutils are tested
> some are simple like yes(1)
Not that simple: https://github.com/coreutils/coreutils/blob/master/src/yes.c
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Show HN: Usr/bin/env Docker run
The -S / --split-string option[1] of /usr/bin/env is a relatively recent addition to GNU Coreutils. It's available starting from GNU Coreutils 8.30[2], released on 2018-07-01.
Beware of portability: it relies on a non-standard behavior from some operating systems. It only works for OS's that treat all the text after the first space as argument(s) to the shebanged executable; rather than just treating the whole string as an executable path (that can happen to contain spaces).
Fortunately this non-standard behavior is more the norm than the exception: it works at least on modern GNU/Linux, BSDs, and macOS.
[1] https://www.gnu.org/software/coreutils/manual/html_node/env-...
[2] https://github.com/coreutils/coreutils/blob/b09dc6306e7affaf...
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From Nand to Tetris: Building a Modern Computer from First Principles
> building a cat from scratch
> That would be an interesting project.
Here is the source code of the OpenBSD implementation of cat:
> https://github.com/openbsd/src/blob/master/bin/cat/cat.c
and here of the GNU coreutils implementation:
> https://github.com/coreutils/coreutils/blob/master/src/cat.c
Thus: I don't think building a cat from scratch or creating a tutorial about that topic is particularly hard (even though the HN audience would likely be interested in it). :-)
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The Linux Scheduler: A Decade of Wasted Cores (2016) [pdf]
the yes command, writing to /dev/null, is making IO calls, which interfere with predictable scheduling.
If you look at the source code for yes, https://github.com/coreutils/coreutils/blob/master/src/yes.c
it builds a buffer of output and then writes that in a for loop
while (full_write (STDOUT_FILENO, buf, bufused) == bufused)
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nohup not working?
Looking at the source of nohup, if the execvp() of the child happens then it _must_ have already done the signal (SIGHUP, SIG_IGN) so - WTF?
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Is it fair to say "ls" is dead? No commits in 15 years
This got me wondering so I went and looked and it seems like lo and behold there was actually a commit to the GNU ls source just 2 weeks ago.
https://github.com/coreutils/coreutils/blob/master/src/ls.c
"maint: prefer char32_t to wchar_t"
- The Tao of Programming
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Decoded: GNU Coreutils
even an empty file? Yes. so now it was a file with a copyright disclaimer and nothing else. And the koan-like question comes to mind is "Can you copyright nothing?" well AT&T sure tried.
Then somebody said our programs should be well defined and not depend on a fluke of unix, which at this point was probable a good idea. so it became "exit 0"
Then somebody said we should write our system utilities in C instead of shell so it runs faster. openbsd still has a good example of how this would look.
http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr....
At some point gnu bureaucracy got involved and said all programs must support the '-h' flag. so that got added, then they said all programs must support locale so that got added. now days gnu true is an astonishing 80 lines long.
https://github.com/coreutils/coreutils/blob/master/src/true....
http://trillian.mit.edu/~jc/humor/ATT_Copyright_true.html
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Exa Is Deprecated
> Yes, ls is maintained. Although, maintained is a very strong word. It exists.
Why would it be a strong word? Here it is, in src/ls.c: https://github.com/coreutils/coreutils
It is then packaged by tens of operating system distributions, who themselves maintain extra patchsets, some of which are then upstreamed.
It is installed and used on millions (billions?) of devices, for 3 decades.
It's a very reliable and trusty "sharp stick of metal" :)
What are some alternatives?
ebsynth - Fast Example-based Image Synthesis and Style Transfer
util-linux
SPH-Fluid-Simulation - A multi-threaded particle-based solver, Smoothed-Particle Hydrodynamics, for the Navier-Stokes equation
madaidans-insecurities
texture - Procedural texture generation package.
busybox - BusyBox mirror
Noise-Extras - Noise & procedural generation code pieces that I didn't feel needed whole repos all to themselves.
src - Read-only git conversion of OpenBSD's official CVS src repository. Pull requests not accepted - send diffs to the tech@ mailing list.
chip-walo - CHIP-8 Emulator using C and SDL2.
linux - Linux kernel source tree
lsblk - List information about block devices in the FreeBSD system.
gnulib - upstream mirror