From a95cc178530b740ee5d7e296aa8729eae345443b Mon Sep 17 00:00:00 2001
From: Kevin Lange <kevin.lange@dakko.us>
Date: Mon, 6 Feb 2012 23:34:35 -0600
Subject: [PATCH] Mm, donuts

---
 userspace/Makefile |  6 ++++++
 userspace/donut.c  | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 userspace/donut.c

diff --git a/userspace/Makefile b/userspace/Makefile
index 7d814a3d..736fabdb 100644
--- a/userspace/Makefile
+++ b/userspace/Makefile
@@ -15,6 +15,7 @@ ENDRM = ../util/mk-end-rm
 
 FREETYPE_INC = -I ../util/toaru-toolchain/i686-pc-toaru/include/freetype2/
 FREETYPE_LIB = ../util/toaru-toolchain/i686-pc-toaru/lib/libfreetype.a
+LIBM = ../util/toaru-toolchain/i686-pc-toaru/lib/libm.a
 
 
 .PHONY: all clean
@@ -51,6 +52,11 @@ clean:
 	@${CC} ${CFLAGS} -s -o $@ $< lib/list.o ${ERRORS}
 	@${END} "CC" "$< [w/libs]"
 
+../hdd/bin/donut: donut.c
+	@${BEG} "CC" "$< [w/libs]"
+	@${CC} ${CFLAGS} -s -o $@ $< ${LIBM} ${ERRORS}
+	@${END} "CC" "$< [w/libs]"
+
 ../hdd/bin/%: %.cpp
 	@${BEG} "CPP" "$<"
 	@${CPP} ${CPPFLAGS} -s -o $@ $< ${ERRORS}
diff --git a/userspace/donut.c b/userspace/donut.c
new file mode 100644
index 00000000..e2f1cfee
--- /dev/null
+++ b/userspace/donut.c
@@ -0,0 +1,22 @@
+/* http://a1k0n.net/2011/07/20/donut-math.html */
+             k;double sin()
+         ,cos();main(){float A=
+       0,B=0,i,j,z[1760];char b[
+     1760];printf("\x1b[2J");for(;;
+  ){memset(b,32,1760);memset(z,0,7040)
+  ;for(j=0;6.28>j;j+=0.07)for(i=0;6.28
+ >i;i+=0.02){float c=sin(i),d=cos(j),e=
+ sin(A),f=sin(j),g=cos(A),h=d+2,D=1/(c*
+ h*e+f*g+5),l=cos      (i),m=cos(B),n=s\
+in(B),t=c*h*g-f*        e;int x=40+30*D*
+(l*h*m-t*n),y=            12+15*D*(l*h*n
++t*m),o=x+80*y,          N=8*((f*e-c*d*g
+ )*m-c*d*e-f*g-l        *d*n);if(22>y&&
+ y>0&&x>0&&80>x&&D>z[o]){z[o]=D;;;b[o]=
+ ".,-~:;=!*#$@"[N>0?N:0];}}/*#****!!-*/
+  printf("\x1b[H");for(k=0;1761>k;k++)
+   putchar(k%80?b[k]:10);A+=0.04;B+=
+     0.02;}}/*****####*******!!=;:~
+       ~::==!!!**********!!!==::-
+         .,~~;;;========;;;:~-.
+             ..,--------,*/