>> energy ball ascii shader

d = dist(x/2+w/4, y, w/2, h/2)
an = angle(x/2+w/4, y, w/2,h/2)+t/4200
r=10.2

if (d < r) lex.bg = randint(r)

ll=abs(an|0)+""
lex.char=ll[ll.length-1]

if (d > r) {
  lex.bg = randint(d)
  lex.fg = randint(d)
  lex.char = ll[ll.length-2]
}


>> original shader..

lex.bg = hue((x+y*y+t/10)/20)
lex.fg = (x+y)%16
lex.char = (y%2) ? ":" : "%" 



>> drifting fire

t += sin(x/1000)*100000
pos = y/h*6 + sin(x*3) - cos(y*t/10000-10)
pos = clamp(pos, 0, 6)
lex.bg = hue(pos)



>> the "bJoel56" shader

yy=y
x-=w/2
y-=h/2

lex.bg = blue(yy/h+random())
lex.fg = green(yy/h*4 + sin(x/100+random()/2)) // hue(t/1000)|0;

var abcd=".'~:;!>+=icjtJYSGSXDQKHNWM";
function chara (aa,n) { return aa[clamp(n*aa.length, 0, aa.length)|0] }
lex.char = chara(abcd, y/h*(5/3 + tan(x/100)+random()/1))



>> noise brushes, works on a black background:

if (lex.bg != 1) lex.bg = max(5, yellow(randint(t)))


>> simple rainbow:

if (lex.bg != 1) lex.bg = randint(t)


>> self-erasing:

if (lex.bg != 1) lex.bg = yellow(randint(t))


>> cycling rainbow brush

if (lex.bg != 1) lex.bg = hue( all_color_hue_order.indexOf( color_names[ lex.bg ] ) + 1 )



>> inelegant way to slow the frame rate of a shader.

window.zz=window.zz||0
if(!(x+y)) zz++
if (lex.bg != 1 && !(zz % 4)) {
  ...
}


>> frog shader v2

t/=-100
d = sinp( (dist(x/2+w/4, y, w/2, h/2) + t)/2 ) * 10

lex.char=',./>"ASE$#'[(floor(d))]
lex.fg = [1,3,9][floor(d*3)%3]
lex.bg=1


>> frog shader v3

// set period to like 0.2 for a normal circle
period = y/10

t/=-100
d = sinp( (dist(x/2+w/4, y, w/2, h/2) + t) * period )
dd = d * 10.5
d3 = dd < 8 ? 0 : 1

lex.char=' .,"+/>OXEN'[(floor(dd))]
lex.fg = [3,9][floor(d3)]
lex.bg=1