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Merge pull request #1594 from xexyl/endoh112

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Add alt versions to 2012/endoh1 + formatting
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Landon Curt Noll authored and GitHub committed 2023-12-01 21:10:48 -07:00
2 parents 6feb979fdc 8bb837f5f8
commit ea17514631
6 files changed
+199 -20
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2012/endoh1/.gitignore
+2
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@@ -1,6 +1,8 @@
endoh1
endoh1.alt
endoh1.alt2
endoh1_color
endoh1_color.alt
configuration.txt
endoh1.orig
prog.orig
2012/endoh1/Makefile
+12 -2
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@@ -57,7 +57,7 @@ ARCH=
# Defines that are needed to compile
#
CDEFINE= -DG="$G" -DP="$P" -DV="$V"
CDEFINE= -DG="$G" -DP="$P" -DV="$V" -DS=12321
# Include files that are needed to compile
#
@@ -154,9 +154,19 @@ ${PROG}_color: ${PROG}_color.c
alt: data ${ALT_TARGET}
@${TRUE}
alt2: ${ALT_TARGET}2 ${PROG}_color.alt
@${TRUE}
${PROG}.alt: ${PROG}.alt.c
${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
${PROG}.alt2: ${PROG}.alt2.c
${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
${PROG}_color.alt: ${PROG}_color.alt.c
${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
# data files
#
data: ${DATA}
@@ -221,7 +231,7 @@ clean:
fi
clobber: clean
${RM} -f ${TARGET} ${ALT_TARGET}
${RM} -f ${TARGET} ${ALT_TARGET} ${ALT_TARGET}2 ${PROG}_color.alt
@-if [ -e sandwich ]; then \
${RM} -f sandwich; \
echo 'ate sandwich'; \
2012/endoh1/README.md
+75 -18
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@@ -4,6 +4,10 @@
make
```
There is a deobfuscated version of this entry. There are two other versions, one
black and white and one coloured, as well that let you slow or speed up the
display. See [alternate code](#alternate-code) below for more details.
## To use:
@@ -28,24 +32,73 @@ this by default.
## Alternate code:
An alternate version of this entry, `endoh1.alt.c`, is provided.
This alternate code is a de-obfuscated version of `endoh1.c`.
The file [endoh1.alt.c](endoh1.alt.c) is deobfuscated.
The file [endoh1_color.alt.c](endoh1_color.alt.c) is like
[endoh1_color.c](endoh1_color.c) except that you can control how long to sleep
between writes. The file [endoh1.alt2.c](endoh1.alt2.c) is like
[endoh1.c](endoh1.c) except you can control how long to sleep between writes.
### Alternate build:
To compile this alternate version:
```sh
make alt
make alt alt2
```
Use `endoh1.alt` as you would `endoh1` above.
### Alternate use:
Use `endoh1.alt`, `endoh1.alt2` and `endoh1_color.alt` as you would `endoh1`
above.
### Alternate try:
WARNING: if you're sensitive to flashing colours do make sure you don't decrease
the value too much.
Try slowing down the display by increasing the sleep time from `12321` to
`50000`:
```sh
make clobber CDEFINE="-DS=50000" alt2
```
Now try using both `endoh1.alt2` and `endoh1_color.alt` as you would `endoh1` above.
Also try speeding up the display by decreasing the sleep time from `12321` to
`9999`:
```sh
make clobber CDEFINE="-DS=9999" alt2
```
Try using both `endoh1.alt2` and `endoh1_color.alt` as you would `endoh1` above.
You might also wish to try redefining the macros `G`, `P` and/or `V`. For
instance:
```sh
make clobber CDEFINE="-DG=5 -DP=5 -DV=5" alt2
```
You might try even:
```sh
make clobber CDEFINE="-DG=I" alt2
```
See the author's remarks for details on these macros.
## Judges' remarks:
Let's play [Jeopardy!](https://en.wikipedia.org/wiki/Jeopardy!)
* A: An obfuscated program that deals with complex numbers and produces animated ASCII graphics.
* Q: What is a Mandelbrot simulator?
A: An obfuscated program that deals with complex numbers and produces animated ASCII graphics.
Q: What is a Mandelbrot simulator?
Bzzzt!
@@ -53,7 +106,8 @@ Such heavily squeezed fluid simulation (this is parsed uniquely
as fluids are not squeezable) has a few quirks that the judges were
happy to experiment with.
One configuration file was inspired by an [XKCD what if? entry](http://whatif.xkcd.com/6/).
One configuration file was inspired by an [XKCD what if?
entry](https://web.archive.org/web/20230711134609/https://whatif.xkcd.com/6/).
## Author's remarks:
@@ -103,7 +157,7 @@ cc endoh1.c -DG=1 -DP=4 -DV=8 -D_BSD_SOURCE -o endoh1 -lm
```
This program is a fluid simulator using [Smoothed-particle hydrodynamics
This program is a fluid simulator using the [Smoothed-particle hydrodynamics
(SPH)](http://en.wikipedia.org/wiki/Smoothed-particle_hydrodynamics) method.
The SPH particles represent the fluid flow. Particles have information about
@@ -111,8 +165,8 @@ the position, density, and velocity. In every simulation step, they are
changed by pressure force, viscosity force, and external force (i.e., gravity).
This program reads a text from standard input, and uses it as an initial
configuration of the particles. The character `#` represents "wall particle" (a
particle with fixed position), and any other non-space characters represent
configuration of the particles. The character `#` represents a "wall particle" (a
particle with a fixed position), and any other non-space characters represent
free particles.
The compilation options `-DG=1 -DP=4 -DV=8` represent, respectively, the factor
@@ -122,10 +176,11 @@ different fluid behavior.
[Marching square](http://en.wikipedia.org/wiki/Marching_squares)-like algorithm
is used to render the particles.
### Portability
The program requires a C99 compiler; it uses `complex` types and one-line
comments. It also uses `usleep`, which may require `-D_BSD_SOURCE` or so
comments. It also uses `usleep(3)`, which may require `-D_BSD_SOURCE` or so
to build with no warning. Under these conditions, it should be portable.
At least, recent compilers with `-std=c99 -Wall -W -Wextra -pedantic` say
nothing.
@@ -144,16 +199,17 @@ and gcc-4.5.3 and clang-3.1 on Cygwin. On Cygwin, gcc and clang complain about
a usage of `I` (complex's imaginary unit), but I bet this is cygwin's issue;
it is surely a C99 feature.
### Obfuscation w/ Spoiler
First of all, the source code itself serves as an initial configuration.
Preprocessing directives (such as `#include`)'s `#` serve as walls.
This program uses `double complex` to represent any 2D vector. But, note that
`x-axis` and `y-axis` is swapped (real axis = y-axis, imaginary axis = x-axis).
The purpose of swapping is not only obfuscation, but also short coding: for
example, to add gravity to total force, `force += G` suffices, rather than
`force += G*I`.
the `x-axis` and `y-axis` are swapped (real axis = y-axis, imaginary axis =
x-axis). The purpose of swapping is not only obfuscation, but also short
coding: for example, to add gravity to total force, `force += G` suffices,
rather than `force += G*I`.
(Incidentally, you can exert horizontal gravity by using for instance `-DG=I`)
@@ -163,10 +219,11 @@ position, wall-flag, density, force, and velocity, in turn.
You can use `G`, `P`, and `V` as a guide to find the calculation code of
gravity, pressure, and viscosity forces.
Though some assignments may look meaningless, it is actually meaningful; it
extracts "integer part of real part" from a complex value by assigning (and
Though some assignments may look meaningless, they are actually meaningful; they
extract "integer part of real part" from a complex value by assigning (and
casting) it to an integer-type variable.
### Notes about Additional Files
[logo.txt](logo.txt) is a source of the logo in this remark file.
2012/endoh1/endoh1.alt2.c
+49
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@@ -0,0 +1,49 @@
# include<stdio.h>// .IOCCC Fluid- #
# include <unistd.h> //2012 _Sim!_ #
# include<complex.h> //|||| ,____. IOCCC- #
# ifndef S
# define S 12321
# elif S < 1
# undef S
# define S 12321
# endif
# ifndef G
# define G 1
# elif G < 1
# undef G
# define G 1
# endif
# ifndef P
# define P 4
# elif P < 1
# undef P
# define P 4
# endif
# ifndef V
# define V 8
# elif V < 1
# undef V
# define V 8
# endif
# define h for( x=011; 2012/* #
# */-1>x ++;)b[ x]//-' winner #
# define f(p,e) for(/* #
# */p=a; e,p<r; p+=5)// #
# define z(e,i) f(p,p/* #
## */[i]=e)f(q,w=cabs (d=*p- *q)/2- 1)if(0 <(x=1- w))p[i]+=w*/// ##
double complex a [ 97687] ,*p,*q ,*r=a, w=0,d; int x,y;char b/* ##
## */[6856]="\x1b[2J" "\x1b" "[1;1H ", *o= b, *t; int main (){/** ##
## */for( ;0<(x= getc ( stdin) );)w=x >10?32< x?4[/* ##
## */*r++ =w,r]= w+1,*r =r[5]= x==35, r+=9:0 ,w-I/* ##
## */:(x= w+2);; for(;; puts(o ),o=b+ 4){z(p [1]*/* ##
## */9,2) w;z(G, 3)(d*( 3-p[2] -q[2]) *P+p[4 ]*V-/* ##
## */q[4] *V)/p[ 2];h=0 ;f(p,( t=b+10 +(x=*p *I)+/* ##
## */80*( y=*p/2 ),*p+=p [4]+=p [3]/10 *!p[1]) )x=0/* ##
## */ <=x &&x<79 &&0<=y&&y<23?1[1 [*t|=8 ,t]|=4,t+=80]=1/* ##
## */, *t |=2:0; h=" '`-.|//,\\" "|\\_" "\\/\x23\n"[x/** ##
## */%80- 9?x[b] :16];;usleep( S) ;}return 0;}/* ##
#### ####
###############################################################################
**###########################################################################*/
2012/endoh1/endoh1_color.alt.c
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@@ -0,0 +1,55 @@
# include<stdio.h>// .IOCCC Fluid- #
# include <unistd.h> //2012 _Sim!_ #
# include<complex.h> //|||| ,____. |||||| #
# ifndef S
# define S 12321
# elif S < 1
# undef S
# define S 12321
# endif
# ifndef G
# define G 1
# elif G < 1
# undef G
# define G 1
# endif
# ifndef P
# define P 4
# elif P < 1
# undef P
# define P 4
# endif
# ifndef V
# define V 8
# elif V < 1
# undef V
# define V 8
# endif
# define c y+=( x=ctanh( -cabs/* #
# */(4[t ]-=20) /2+9)* 3+3)*// #
# define f(p,e) for(p/* #
# */=a;e ,p<r;p +=5)/// #
# define z(e,i) f(p,p/* #
## */[i]=e)f(q,w=cabs (d=*p- *q)/2- 1)if(0 <(x=1- w))p[i]+=w*/// ##
double complex a [ 97687] ,*p,*q ,*r=a, w=0,d; char b[97687]=/* ##
## */"GO\x1b[2J\x1b[" "1;1H" ,*o=b, *t;int x,y,j; void h(int e){/** ##
## */for( t=b;b+ 24045> (t+=12 );c 6, sprintf (t,/** ##
## */"%c" "[48%" "c5;%" "03dm" "%c",3 *9,e,c 36,e/* ##
## */?(t- b)%960 ?(15-t [11])[ "\x23" "/\\_" "\\"/* ##
## */"||" ",//|" ".-`' "]:10: 0)) y= 0020,c 01;}/* ##
## */void g( int i){7[t +=i]|= x/=2;* t+=y=p [2];/* ##
## */}int main() {for(;( x=getc (stdin ))>0;)w =10</* ##
## */x?32 <x?4[* r++=w,r]=w+1,*r= r[5]=x ==35,r+=9:0,w-I/* ##
## */:(x= w+02); for(;;puts(o),o =b+6){ z(p[1]*9,2)w;z/* ##
## */(G,3 )(d*(3 -p[2]-q[2])*P +p[4]* V-q[4]*V )/p/* ##
#### ####
###############################################################################
**###########################################################################*/
[2];h(0 );f(p,* p+= p[4]+=p [3]/10*!p
[1] )(t =b+ 16+ (x= *p* I)* 12+ 960
*(y =*p /2) ,x= 0<= x&& 79> x&&
0<= y&& 23> y?x =16 ,g( 0),g(12),
g(+ 948 ),g (12 ),0 :0) ;h( 59) ;;;
usleep( S ); }return 0;} /*IOCCC '12 **/
thanks-for-fixes.md
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@@ -3343,6 +3343,12 @@ Cody also added the [try.sh](2012/blakely/try.sh) script.
[Cody](#cody) added explicit linking of libm (`-lm`) as not all systems do this
implicitly (Linux doesn't seem to but macOS does).
Cody also added two [alt versions](2012/endoh1/README.md#alternate-code) that
let one control how fast to display (how long to sleep in between writes) the
fluid, one an alt of the colour version (that Yusuke added at the request of the
judges) and an alt of the original. The [endoh1.alt.c](2012/endoh1/endoh1.alt.c)
was provided by Yusuke as a de-obfuscated version.
## [2012/endoh2](2012/endoh2/endoh2.c) ([README.md](2012/endoh2/README.md))