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IFS2: pearl experiment (eh...)
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@warmist
warmist committed Jun 3, 2021
1 parent 94eea4b commit 2078f5e
Showing 1 changed file with 119 additions and 42 deletions.
161 changes: 119 additions & 42 deletions projects/IFS2.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ require "colors"
local luv=require "colors_luv"
local bwrite = require "blobwriter"
local bread = require "blobreader"
local size_mult=0.5
size_mult=size_mult or 0.5
local ffi = require("ffi")
--[[
TODO:
Expand All @@ -17,6 +17,8 @@ local ffi = require("ffi")
- do real (from chrom. abber.) tonemapping
- maybe 2d map of colors?
- multiplicative blending for "absorption" like thing
- clear to blackbody
- stamp with "multiply" and "pow(absorbtion,depth)"
save hd buffer with tonemapping applied
--]]

Expand All @@ -25,8 +27,8 @@ win_h=win_h or 0

aspect_ratio=aspect_ratio or 1
function update_size()
local trg_w=1440*size_mult
local trg_h=1440*size_mult
local trg_w=1024*size_mult
local trg_h=1024*size_mult
--this is a workaround because if everytime you save
-- you do __set_window_size it starts sending mouse through windows. SPOOKY
if win_w~=trg_w or win_h~=trg_h then
Expand All @@ -42,7 +44,7 @@ local size=STATE.size
local max_palette_size=50
local need_clear=false
local oversample=1
local complex=true
local complex=false
local init_zero=false
local sample_count=math.pow(2,20)

Expand Down Expand Up @@ -138,7 +140,7 @@ config=make_config({
--{"gen_radius",2,type="float",min=0,max=10},

{"gamma",1,type="float",min=0.01,max=5},
--{"exposure",1,type="float",min=0,max=10},
{"exposure",1,type="float",min=0,max=10},
{"white_point",1,type="float",min=0,max=10},
--[[ other tonemapping
Expand Down Expand Up @@ -176,7 +178,7 @@ uniform float white_point;
uniform float uchimura_params[6];
#define M_PI 3.14159265358979323846264338327950288
#define SHOW_PALETTE 0
vec4 mix_palette(float value )
{
if (palette_size==0)
Expand Down Expand Up @@ -345,8 +347,11 @@ vec3 tonemap(vec3 light)
float x=light.x/sum;
float y=light.y/sum;
float Y=light.y;
Y=Y/(9.6*avg_lum);
#if SHOW_PALETTE
Y=Y*exposure/(9.6);
#else
Y=Y*exposure/(9.6*avg_lum);
#endif
//Y=(Y-min_max.x)/(min_max.y-min_max.x);
//Y=(log(Y+1)-log(min_max.x+1))/(log(min_max.y+1)-log(min_max.x+1));
//Y=log(Y+1)/log(min_max.y+1);
Expand All @@ -367,12 +372,18 @@ vec3 tonemap(vec3 light)
light.x = light.y*(small_x / small_y);
light.z = light.x / small_x - light.x - light.y;
//light=clamp(light,0,1);
return xyz2rgb(light*100);
float s=length(light);
//s=pow(s,1/8);
return mix(xyz2rgb(light*100),vec3(1),smoothstep(0.0,1,s/16));
//return xyz2rgb(light*100);
}
void main(){
vec2 normed=(pos.xy+vec2(1,1))/2;
//vec3 ccol=texture(tex_main,normed).xyz;
#if SHOW_PALETTE
vec3 ccol=mix_palette2(normed.x).xyz;
#else
vec3 ccol=texture(tex_main,normed).xyz;
#endif
/*
if(ccol.x<0)ccol.x=log(1-ccol.x);
Expand All @@ -385,6 +396,7 @@ void main(){
ccol=pow(ccol,vec3(v_gamma));
//ccol*=exp(v_gamma);
color = vec4(tonemap(ccol),1);
//color.xyz=pow(color.xyz,vec3(v_gamma));
color.xyz=pow(color.xyz,vec3(2.2));
color.a=1;
}
Expand Down Expand Up @@ -486,7 +498,7 @@ function draw_visits( )
display_shader:set_i("tex_main",0)
display_shader:set("v_gamma",config.gamma)

--display_shader:set("exposure",config.exposure)
display_shader:set("exposure",config.exposure)
display_shader:set("white_point",config.white_point)
display_shader:draw_quad()

Expand Down Expand Up @@ -669,7 +681,7 @@ function D65_blackbody(iter, temp)
local b65=black_body(iter,6503.5);
return D65_approx(iter)*(black_body(iter,temp)/b65);
end
function gaussian( x, alpha, mu, sigma1, sigma2)
function gaussian_value( x, alpha, mu, sigma1, sigma2)
local s=sigma1
if x>=mu then
s=sigma2
Expand All @@ -680,19 +692,36 @@ end

function xyz_from_normed_waves(v_in)
local ret={}
ret.x = gaussian(v_in, 1.056, 0.6106, 0.10528, 0.0861)
+ gaussian(v_in, 0.362, 0.1722, 0.04444, 0.0742)
+ gaussian(v_in, -0.065, 0.3364, 0.05667, 0.0728);
ret.x = gaussian_value(v_in, 1.056, 0.6106, 0.10528, 0.0861)
+ gaussian_value(v_in, 0.362, 0.1722, 0.04444, 0.0742)
+ gaussian_value(v_in, -0.065, 0.3364, 0.05667, 0.0728);

ret.y = gaussian(v_in, 0.821, 0.5244, 0.1303, 0.1125)
+ gaussian(v_in, 0.286, 0.4192, 0.0452, 0.0864);
ret.y = gaussian_value(v_in, 0.821, 0.5244, 0.1303, 0.1125)
+ gaussian_value(v_in, 0.286, 0.4192, 0.0452, 0.0864);

ret.z = gaussian(v_in, 1.217, 0.1583, 0.0328, 0.1)
+ gaussian(v_in, 0.681, 0.2194, 0.0722, 0.0383);
ret.z = gaussian_value(v_in, 1.217, 0.1583, 0.0328, 0.1)
+ gaussian_value(v_in, 0.681, 0.2194, 0.0722, 0.0383);

return ret;
end

function gen_layers( min,max,count )
local ret={}
for i=1,count do
--local d=math.random()*(max-min)+min
local d=gaussian((max-min)/2,max-min)
table.insert(ret,d)
end
return ret
end
function phase_difference(layers,n1,n0,angle,wavelen,layer_count)
layer_count=layer_count or #layers
local ret=0
for i=1,layer_count do
local d=layers[i]
ret=ret+d*(n1/n0)*math.cos(angle)/wavelen
end
return ret*math.pi*4
end
palette.generators={
{"random",function (ret, hue_range,sat_range,lit_range )
local count=math.random(20,50)
Expand Down Expand Up @@ -810,8 +839,8 @@ palette.generators={

table.insert(ret,new_color(h2,s2,l2,((i)/max_step)*(max_palette_size-1)))
end
end},
{"fullspectrum",function (ret, hue_range,sat_range,lit_range )
end
},{"fullspectrum",function (ret, hue_range,sat_range,lit_range )
local s=0.4
local l=0.33
palette.is_xyz=true
Expand All @@ -825,7 +854,32 @@ palette.generators={
w.z=w.z*b
table.insert(ret,new_color(w.x,w.y,w.z,(i/(max_palette_size-1))*(max_palette_size-1)))
end
end}
end,
},{"pearl",function (ret, hue_range,sat_range,lit_range )
palette.is_xyz=true
local layers=gen_layers(400,700,1000)
for i=0,max_palette_size-1 do
local s={x=0,y=0,z=0}
local h=i/(max_palette_size-1)
local angle=h*math.pi/4
local step_size=0.01
for nw=0,1,step_size do
local w=xyz_from_normed_waves(nw)
local b=D65_blackbody(nw,6503.5)--6503.5)
--local b=black_body(h,6503.5)--6503.5)
--thickness 400->700nm
local wl=mix(380,740,nw);
--function phase_difference(layer_thickness_min,layer_thickness_max,count,n1,n0,angle,wavelen)
local eta=phase_difference(layers,1.53,1.0,math.pi/8,wl,math.floor(800*h)+200)
b=b*(math.cos(eta)+1)*step_size
s.x=s.x+w.x*b
s.y=s.y+w.y*b
s.z=s.z+w.z*b
end
table.insert(ret,new_color(s.x,s.y,s.z,(i/(max_palette_size-1))*(max_palette_size-1)))
end
end
}
}
function gen_palette( )
local ret={}
Expand Down Expand Up @@ -1461,18 +1515,22 @@ function rand_function( )
local s=random_math(rand_complexity)
--str_cmplx=random_math_complex(rand_complexity,nil,{"s","p","vec2(cos(global_seed*2*M_PI),sin(global_seed*2*M_PI))","params.xy","params.zw"})--{"vec2(global_seed,0)","vec2(0,1-global_seed)"})
--str_cmplx=random_math_complex(rand_complexity,nil,{"s","c_mul(p,vec2(exp(-npl),1-exp(-npl)))","c_mul(params.xy,vec2(cos(global_seed*2*M_PI),sin(global_seed*2*M_PI)))","params.zw"})
--local tbl_insert={"vec2(cos(length(s)*M_PI*5+move_dist),sin(length(s)*M_PI*5+move_dist))*(0.25+global_seed)","vec2(cos(length(p)*M_PI*4+global_seed),sin(length(p)*M_PI*4+global_seed))*(move_dist)","params.xy","params.zw","vec2(s.x,p.y)","vec2(p.x,s.y)"}
local tbl_insert={"mix(s,s/length(s),1-global_seed)","mix(p,p/length(p),global_seed)","params.xy","params.zw"}--"mix(p,p/length(p),global_seed)"
--local tbl_insert_cmplx={"vec2(cos(length(s)*M_PI*5+move_dist),sin(length(s)*M_PI*5+move_dist))*(0.25+global_seed)","vec2(cos(length(p)*M_PI*4+global_seed),sin(length(p)*M_PI*4+global_seed))*(move_dist)","params.xy","params.zw","vec2(s.x,p.y)","vec2(p.x,s.y)"}
local tbl_insert_cmplx={"s","p","params.xy","params.zw","vec2(cos(global_seed*M_PI*2),sin(global_seed*M_PI*2))*move_dist"}--"mix(p,p/length(p),global_seed)"
--local tbl_insert_cmplx={"mix(s,s/length(s),1-global_seed)","mix(p,p/length(p),global_seed)","params.xy","params.zw"}--"mix(p,p/length(p),global_seed)"

local tbl_insert_x={"s.x+cos(global_seed*M_PI*2)","p.y+params.x","params.x","params.y"}
local tbl_insert_y={"s.y+sin(global_seed*M_PI*2)","p.x+params.y","params.z","params.w"}
--[[
local point_count=3
for i=1,point_count do
local v=(i-1)/point_count
local vr=v*math.pi*2
local r=0.1
table.insert(tbl_insert,string.format("vec2(%g,%g)",math.cos(vr)*r,math.sin(vr)*r))
table.insert(tbl_insert_cmplx,string.format("vec2(%g,%g)",math.cos(vr)*r,math.sin(vr)*r))
end
--]]
-- [==[
--[==[
local tex_variants={
-- [[
"tex_p.xy","tex_p.yz","tex_p.zx",
Expand All @@ -1484,16 +1542,35 @@ function rand_function( )
"vec2(atan(tex_s.y,tex_s.x),atan(tex_p.y,tex_p.x))/M_PI","vec2(atan(tex_p.y,tex_p.x),atan(tex_s.y,tex_s.x))/M_PI",
"vec2(atan(tex_s.x,tex_s.z),atan(tex_p.x,tex_p.z))/M_PI","vec2(atan(tex_p.x,tex_p.z),atan(tex_s.x,tex_s.z))/M_PI"
}
-- [[
local num_tex=1
local num_tex=5
for i=1,num_tex do
--table.insert(tbl_insert,"c_mul("..tex_variants[math.random(1,#tex_variants)]..",vec2(cos(global_seed*M_PI*2),sin(global_seed*M_PI*2)))")
table.insert(tbl_insert,tex_variants[math.random(1,#tex_variants)])
table.insert(tbl_insert_cmplx,tex_variants[math.random(1,#tex_variants)])
--table.insert(tbl_insert_x,tex_variants[math.random(1,#tex_variants)])
--table.insert(tbl_insert_y,tex_variants[math.random(1,#tex_variants)])
end
--]==]

local tex_variants_real={
-- [[
"tex_p.x","tex_p.y","tex_p.z",
"tex_s.x","tex_s.y","tex_s.z",

--]]
"atan(tex_s.y,tex_s.x)/M_PI","atan(tex_p.y,tex_p.x)/M_PI",
"atan(tex_s.x,tex_s.z)/M_PI","atan(tex_p.x,tex_p.z)/M_PI"
}
-- [[
local num_tex=2
for i=1,num_tex do
table.insert(tbl_insert_x,tex_variants_real[math.random(1,#tex_variants_real)])
table.insert(tbl_insert_y,tex_variants_real[math.random(1,#tex_variants_real)])
end
--]]
--]==]
--chebyshev_poly_series(10)
str_cmplx=random_math_complex(rand_complexity,nil,tbl_insert)
str_cmplx=random_math_complex(rand_complexity,nil,tbl_insert_cmplx)
--str_cmplx=random_math_complex(15,"cheb_eval(R)",tbl_insert)
--str_cmplx=random_math_complex(15,"c_mul(cheb_eval(c_mul(vec2(cos(global_seed*M_PI*2),sin(global_seed*M_PI*2)),(s-p))),R)",tbl_insert)
--str_cmplx=newton_fractal(rand_complexity)
Expand Down Expand Up @@ -1574,8 +1651,8 @@ function rand_function( )
--str_y="cos("..s.."-s.y*s.x)"
--str_x=random_math_centered(3,rand_complexity)
--str_y=random_math_centered(3,rand_complexity)
str_x=random_math(rand_complexity,nil,{"s.x+cos(global_seed*M_PI*2)*(p.y+1.0)","p.y","params.x","params.y"})
str_y=random_math(rand_complexity,nil,{"s.y+sin(global_seed*M_PI*2)*(p.x-1.0)","p.x","params.z","params.w"})
str_x=random_math(rand_complexity,nil,tbl_insert_x)
str_y=random_math(rand_complexity,nil,tbl_insert_y)

--[[
local str1="p.x"
Expand Down Expand Up @@ -1700,16 +1777,16 @@ function rand_function( )
--str_postamble=str_postamble.."vec2 ds=s-last_s;float ls=length(ds);s=last_s+ds*(move_dist/ls);"
--str_postamble=str_postamble.."vec2 ds=s-last_s;float ls=length(ds);float vv=1-atan(ls*move_dist)/(M_PI/2);s=last_s+ds*(move_dist*vv/ls);"
--str_postamble=str_postamble.."vec2 ds=s-last_s;float ls=length(ds);float vv=1-atan(ls*(global_seed*8))/(M_PI/2);s=last_s+ds*((global_seed*7)*vv/ls);"
str_postamble=str_postamble.."vec2 ds=s-last_s;float ls=length(ds);float vv=exp(-1/dot(s,s));s=last_s+ds*(move_dist*vv/ls);"
--str_postamble=str_postamble.."vec2 ds=s-last_s;float ls=length(ds);float vv=exp(-1/npl);s=last_s+ds*(move_dist*vv/ls);"
--str_postamble=str_postamble.."vec2 ds=s-last_s;float ls=length(ds);float vv=exp(-dot(s,s)/global_seed);s=last_s+ds*(move_dist*vv/ls);"
str_postamble=str_postamble.."vec2 ds=s-last_s;float ls=length(ds);float vv=exp(-1/npl);s=last_s+ds*(move_dist*vv/ls);"
--]]
--[[ move towards circle
str_postamble=str_postamble.."vec2 tow_c=s+vec2(cos(normed_iter*M_PI*2),sin(normed_iter*M_PI*2))*move_dist;s=(dot(tow_c,s)*tow_c/length(tow_c));"
--]]
--[[ boost
str_preamble=str_preamble.."s*=move_dist;"
--]]
--[[ boost less with distance
-- [[ boost less with distance
str_preamble=str_preamble.."s*=move_dist*exp(-1/dot(s,s));"
--str_preamble=str_preamble.."s*=global_seed*exp(-1/dot(s,s));"
--]]
Expand Down Expand Up @@ -1787,7 +1864,7 @@ function rand_function( )
str_preamble=str_preamble.."vec2 os=s;"
--str_postamble=str_postamble.."s/=length(s);s=os+s*move_dist*exp(1/-dot(p,p));"
--str_postamble=str_postamble.."s/=length(s);s=os+s*exp(-dot(p,p)/move_dist);"
str_postamble=str_postamble.."s/=length(s);s=os+s*dot(tex_s,tex_s)/move_dist;"
str_postamble=str_postamble.."s/=length(s);s=os+s*dot(tex_s,tex_s)/(move_dist*cos(global_seed*M_PI*2));"
--str_postamble=str_postamble.."s/=length(s);s=os+s*move_dist;"
--str_postamble=str_postamble.."s/=length(s);s=os+c_mul(s,vec2(params.zw));"
--str_postamble=str_postamble.."s/=length(s);s=os+c_mul(s,vec2(params.zw)*floor(global_seed*move_dist+1)/move_dist);"
Expand All @@ -1808,7 +1885,7 @@ function rand_function( )
str_preamble=str_preamble.."s=to_polar(s);p=to_polar(p);"
str_postamble=str_postamble.."s=from_polar(s);p=from_polar(p);"
--]]
--[[ centered-polar
-- [[ centered-polar
str_preamble=str_preamble.."s=to_polar(s-p);"
str_postamble=str_postamble.."s=from_polar(s)+p;"
--]]
Expand All @@ -1821,8 +1898,8 @@ function rand_function( )
--[[ unrotate POST
--str_postamble=str_postamble.."s=vec2(cos(-params.z)*s.x-sin(-params.z)*s.y,cos(-params.z)*s.y+sin(-params.z)*s.x);"
--str_postamble=str_postamble.."s=vec2(cos(-0.7853981)*s.x-sin(-0.7853981)*s.y,cos(-0.7853981)*s.y+sin(-0.7853981)*s.x);"
--str_postamble=str_postamble.."p=vec2(cos(-params.z*M_PI*2)*p.x-sin(-params.z*M_PI*2)*p.y,cos(-params.z*M_PI*2)*p.y+sin(-params.z*M_PI*2)*p.x);"
str_postamble=str_postamble.."s=vec2(cos(-normed_iter*M_PI*2)*s.x-sin(-normed_iter*M_PI*2)*s.y,cos(-normed_iter*M_PI*2)*s.y+sin(-normed_iter*M_PI*2)*s.x);"
str_postamble=str_postamble.."p=vec2(cos(-params.z*M_PI*2)*p.x-sin(-params.z*M_PI*2)*p.y,cos(-params.z*M_PI*2)*p.y+sin(-params.z*M_PI*2)*p.x);"
--str_postamble=str_postamble.."s=vec2(cos(-normed_iter*M_PI*2)*s.x-sin(-normed_iter*M_PI*2)*s.y,cos(-normed_iter*M_PI*2)*s.y+sin(-normed_iter*M_PI*2)*s.x);"
--]]
--[[ unoffset POST
str_postamble=str_postamble.."s-=params.xy;"
Expand Down Expand Up @@ -2452,7 +2529,7 @@ vec2 mapping(vec2 p)
//return p; //normal - do nothing
//return abs(p)-vec2(1);
//return mod(p+vec2(1),2)-vec2(1); //modulo, has ugly artifacts when point is HUGE
/*
///*
if(length(p)<50) //modulo, but no artifacts because far away points are far away
{
float size=2.005; //0.005 overdraw as it smooths the tiling when using non 1 sized points
Expand Down Expand Up @@ -2724,7 +2801,7 @@ void main(){
else
c=rgb2xyz(mix_palette(color_value).xyz);
c*=a*intensity;
c+=vec3(0.01);
//c+=vec3(0.01);
//c*=(sin(start_l*M_PI*16)+0.6);
//c*=(sin(normed_iter*M_PI*8)+0.1);
//c*=(sin(start_l*M_PI*8)+0.0);
Expand Down

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