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index.html
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<!DOCTYPE html>
<html><head>
<meta charset='utf-8'>
<style>
* { margin: 0; padding: 0; border: none; overflow: hidden; width:100%; height:100% }
</style>
<script type="text/javascript">
if(typeof String.prototype.startsWith != 'function') {
String.prototype.startsWith = function (str){ return this.slice(0, str.length) == str }
}
if(typeof(String.prototype.trim) != 'function') {
String.prototype.trim = function() { return String(this).replace(/^\s+|\s+$/g, '') }
}
function setupGL(canvas) {
var gl = surface.getContext("webgl") || surface.getContext("experimental-webgl")
if(!gl) throw new Error("no webgl context")
surface.gl = gl
window.onresize = function() {
var surf = getSurf()
var w = surf.clientWidth; var h = surf.clientHeight;
if(!gl.w || gl.w != w || gl.h != h) {
gl.w = w; gl.h = h
surf.width = w
surf.height = h
//console.log("resize " + w + " x " + h + " => ")
resize(gl)
step()
}
}
window.onmousemove = function(e) {
if(window.draging) {
var deltaX = e.x - window.dragX
var deltaY = e.y - window.dragY
gl.scroll(deltaX - window.deltaX, deltaY - window.deltaY)
window.deltaX = deltaX
window.deltaY = deltaY
}
}
window.onmousedown = function(e) {
window.dragX = e.x
window.dragY = e.y
window.deltaX = 0
window.deltaY = 0
window.draging = true
}
window.onmouseup = function(e) { window.draging = false }
window.onwheel = function(e) { gl.zoom(Math.sign(e.wheelDelta), e.x, e.y) }
window.onkeydown = function(e) {
switch(e.which) {
case 77: gl.zoom(-1, gl.w / 2, gl.h / 2); break;
case 80: gl.zoom( 1, gl.w / 2, gl.h / 2); break;
case 32: if(gl.content.mode == 8) gl.content.mode = 0; else gl.content.mode++; console.log(gl.content.mode); break;
default: gl.key = String.fromCharCode(e.which)
}
}
}
function getEl(id) {
var r = document.getElementById(id)
if(!r) throw new Error("element [" + id + "] not found")
return r
}
function getSurf() { return getEl("surface") }
function getGl() {
var surface = getSurf();
if(!surface.gl) setupGL(surface);
return surface.gl;
}
function getQuad(gl) {
if(!gl.quad) {
var bufId = gl.createBuffer()
gl.bindBuffer(gl.ARRAY_BUFFER, bufId)
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([0,0, 0,1, 1,1, 1,0]), gl.STATIC_DRAW)
gl.quad = function(posAttrib) {
gl.bindBuffer(gl.ARRAY_BUFFER, bufId)
gl.vertexAttribPointer(posAttrib, 2, gl.FLOAT, false, 0, 0)
gl.drawArrays(gl.TRIANGLE_FAN, 0, 4)
}
}
return gl.quad
}
function compile(s) {
if(!s.shader) {
var gl = getGl();
var shader;
if(s.type == "x-shader/x-vertex") shader = gl.createShader(gl.VERTEX_SHADER);
else if(s.type == "x-shader/x-fragment") shader = gl.createShader(gl.FRAGMENT_SHADER);
else return null;
var src = '';
for(c = s.firstChild; c; c = c.nextSibling) if(c.nodeType == c.TEXT_NODE) src += c.textContent;
var vars = []
src.replace(/\/\/.*$/mg, '').replace(/\/\*.*\*\//g, '').replace(/^.*#.*/mg, '').split(';').forEach(function(statement) {
var words = statement.split(/\W/)
.map(function(w) { return w.trim() })
.filter(function(w) { return w != '' })
.filter(function(w) { return ["const", "int", "float", "vec2", "vec3", "vec4", "sampler2D"].indexOf(w) < 0 })
if(["uniform", "attribute"].indexOf(words[0]) >= 0) for(var i = 1; i < words.length; i++) vars.push({
type: words[0],
name: words[i]
})
})
src = "precision mediump float;" + src.replace(/\$\w+/g, function(name) {
var raw = name[1] == '_'
var r = function(n) {
if(n.match(/\D/) == null) return parseInt(n)
switch(n) {
case 'pi': return Math.PI
case 'pi2': return Math.PI * 2
case 'half': return .5/255
case 'invWidth': return 1/config.width
case 'invHeight': return 1/config.height
case 'invSize': return "vec2(" + 1/config.width + ", " + 1/config.height + ")"
case 'action': return 16
case 'left': return 16
case 'right': return 32
case 'up': return 64
case 'down': return 128
default: return (n in config) ? config[n] : n
}
}(name.slice(raw ? 2 : 1))
if(!raw && typeof r == 'number' && r === (r|0)) {
r = (r / 255) + '';
if(r.indexOf('.') < 0) r += '.';
}
//console.log(name, r)
return r
})
gl.shaderSource(shader, src)
gl.compileShader(shader)
if(!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
var lines = src.split('\n'), lined = ''
for(var i = 0; i < lines.length; i++) lined += (i+1) + '\t' + lines[i] + '\n'
throw new Error("error in shader [" + s.id + "]\n" + gl.getShaderInfoLog(shader) + "\n" + lined)
}
s.shader = shader
s.vars = vars
//console.log("shader compiled: " + s.id + " => " + JSON.stringify(s.vars))
}
return s;
}
function entry() {
var gl = getGl();
gl.program = function(shaders) {
if(!gl.progCache) gl.progCache = {}
var key = shaders.toString();
if(!gl.progCache[key]) {
var prog = gl.createProgram();
var vars = []
shaders.forEach(function(s) {
var shader = compile(getEl(s));
vars = vars.concat(shader.vars)
gl.attachShader(prog, shader.shader)
})
gl.linkProgram(prog)
if(!gl.getProgramParameter(prog, gl.LINK_STATUS)) throw new Error("error in program [" + key + "]\n" + gl.getProgramInfoLog(prog));
gl.useProgram(prog)
prog.vars = {}
vars.forEach(function(v) {
if(v.type == 'attribute') {
prog.vars[v.name] = gl.getAttribLocation(prog, v.name)
gl.enableVertexAttribArray(prog, prog.vars[v.name]);
} else if(v.type == 'uniform') {
prog.vars[v.name] = gl.getUniformLocation(prog, v.name)
}
if(typeof(prog[v.name]) == "undefined") prog[v.name] = prog.vars[v.name]
})
//console.log("progam linked: " + key + " => " + JSON.stringify(prog.vars))
gl.progCache[key] = prog
} else gl.useProgram(gl.progCache[key])
return gl.progCache[key]
}
init(gl)
window.onresize()
}
function step() {
frame(getGl())
requestAnimationFrame(step)
//setTimeout(step, 1000)
}
var config = {
width: 1024,
height: 1024,
food_gen: 1,
initE: 40, initP: 40,
init: {
density: 0.1,
min_food: 50, max_food: 150
},
eat: 1, draw: 2, build:3, move: 4, give: 5, take: 6, clone:7, die: 9,
gainEat:1, gainDraw:6, gainBuild:1, gainGive:2,
costEat:3, costDraw:8, costBuild:2,costMove:2, costGive:3,costClone:100,
gainTake: 1, costTake: 2, taken: 10,
costNaked: 1, probaRegenerate: 1,
species : [
{ name: "plant" },
{ name: "sheep" },
{ name: "wolf" }
]
}
function init(gl) {
gl.clearColor(0,0,0,1)
gl.camera = new Float32Array([0, 0, 20])
gl.scroll = function(x,y) {
gl.camera[0] -= x
gl.camera[1] += y
}
gl.zoom = function(s, x,y) {
var m = 1.1
m = s == 0 ? 1 : s > 0 ? m : 1/m
var target = gl.camera[2] * m
if(target < 1) {
target = 1
m = target / gl.camera[2]
}
if(target > 150) {
target = 150
m = target / gl.camera[2]
}
gl.camera[2] = target
s = 1 - 1/m
gl.camera[0] += s * x
gl.camera[1] += s * (gl.canvas.height - y)
gl.camera[0] *= m
gl.camera[1] *= m
}
gl.content = {}
var n = config.width * config.height | 0
var background = new Uint8Array(new ArrayBuffer(n * 4)) // [ food, noise?, ?, action ]
var cells = new Uint8Array(new ArrayBuffer(n * 4)) // [ species, state?, energy, protect ]
var entropy = new Uint8Array(new ArrayBuffer(n * 4))
var food_min = config.init.min_food, food_delta = (config.init.max_food - config.init.min_food)
for(var i = 0; i < n; i++) {
if(Math.random() <= config.init.density) {
var c = Math.floor(Math.random() * config.species.length) | 0
cells[4*i] = c + 1 | 0
cells[4*i+2] = config.initE
cells[4*i+3] = config.initP
}
background[4*i] = food_min + Math.random() * food_delta
entropy[4*i ] = Math.random() * 256
entropy[4*i+1] = Math.random() * 256
entropy[4*i+2] = Math.random() * 256
entropy[4*i+3] = Math.random() * 256
}
function setLinear() {
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
}
function setNearest() {
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
}
function setRepeat() {
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
}
function createTexture(data) {
var tex;
gl.bindTexture(gl.TEXTURE_2D, tex = gl.createTexture())
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, config.width, config.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, data)
setNearest(); setRepeat();
return tex;
}
gl.content.entropy = createTexture(entropy)
gl.content.background = {
tex : [createTexture(background), createTexture(background)],
which : 0
}
gl.content.cells = {
tex : [createTexture(cells), createTexture(cells)],
which : 0
}
function createFBO(tex) {
var fbo;
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo = gl.createFramebuffer())
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0)
if(gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) throw new Error("unsupported FBO config")
return fbo;
}
function addFBO(obj) {
obj.fbo = obj.tex.map(createFBO)
obj.read = function() { return this.tex[this.which] }
obj.write = function() { return this.fbo[this.which] }
}
addFBO(gl.content.background)
addFBO(gl.content.cells)
gl.content.cycle = 0
gl.content.mode = 0
}
function resize(gl) { }
function setup(gl, shader) {
var prog = gl.program(["2d", shader])
if(prog.background) { gl.activeTexture(gl.TEXTURE0); gl.bindTexture(gl.TEXTURE_2D, gl.content.background.read()); gl.uniform1i(prog.background, 0) }
if(prog.cells) { gl.activeTexture(gl.TEXTURE1); gl.bindTexture(gl.TEXTURE_2D, gl.content.cells.read()); gl.uniform1i(prog.cells, 1) }
if(prog.entropy) { gl.activeTexture(gl.TEXTURE2); gl.bindTexture(gl.TEXTURE_2D, gl.content.entropy); gl.uniform1i(prog.entropy, 2) }
if(prog.seed) gl.uniform2f(prog.seed, Math.random(), Math.random())
return prog
}
function run(gl, shader, target) {
target.which = 1 - target.which
gl.bindFramebuffer(gl.FRAMEBUFFER, target.write())
target.which = 1 - target.which
getQuad(gl)(setup(gl, shader))
target.which = 1 - target.which
}
function process(gl) {
run(gl, "decide", gl.content.background)
run(gl, "resolve", gl.content.background)
run(gl, "act", gl.content.cells)
}
function draw(gl) {
gl.bindFramebuffer(gl.FRAMEBUFFER, null)
var prog;
if(gl.content.mode == 0) prog = setup(gl, "draw")
else {
prog = setup(gl, "debug")
gl.uniform1i(prog.channel, gl.content.mode)
}
gl.uniform3fv(prog.camera, gl.camera)
getQuad(gl)(prog.posIn)
}
function frame(gl) {
gl.viewport(0, 0, config.width, config.height)
process(gl)
if(gl.key) {
switch(gl.key) {
case 'A': run(gl, "decide", gl.content.background); break;
case 'Z': run(gl, "check", gl.content.background); break;
case 'E': run(gl, "mark", gl.content.background); break;
case 'R': run(gl, "resolve", gl.content.background); break;
case 'T': run(gl, "act", gl.content.cells); break;
}
gl.key = null
}
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height)
draw(gl)
gl.content.cycle++
}
</script>
<script type="x-shader/x-vertex" id="2d">
uniform float time;
attribute vec2 posIn;
void main(void) {
gl_Position = vec4(posIn * vec2(2) - vec2(1), vec2(0,1));
}
</script>
<script type="x-shader/x-fragment" id="draw">
uniform vec3 camera;
uniform sampler2D background, cells;
vec3 hue(float h) {
return clamp(vec3(
6. * abs(h-.5) - 1.,
2. - 6. * abs(h - .33333333333333),
2. - 6. * abs(h - .66666666666667)
), 0., 1.);
}
void main(void) {
vec2 trans = (gl_FragCoord.xy + camera.xy) / camera.z;
vec2 grid1 = step( 1. - .2/camera.z, cos(trans * $pi2) );
vec2 grid10 = step( 1. - .05/camera.z, cos(trans * .1*$pi2) );
vec2 grid100 = step( 1. - .01/camera.z, cos(trans * .01*$pi2) );
vec2 grid2 = grid100 * grid10 + grid10 * clamp(.1 * (camera.z - 4.), 0., 1.) + grid1 * clamp(.01 * (camera.z - 35.), 0., 1.);
float grid = min(1., grid2.x + grid2.y);
vec2 texCoord = trans * $invSize;
vec4 bg = texture2D(background, texCoord);
vec4 cell = texture2D(cells, texCoord);
vec3 color;
if(cell.r != 0.) { // draw cell
color = hue(fract(cell.r * 70.));
vec3 fill = color * (0.1 + 0.8 * cell.b);
if(max(abs(fract(trans.x) - .5), abs(fract(trans.y) - .5)) > (.5 - cell.a * .5)) { // border
color = mix(fill, (color + 1.) * .5, clamp((camera.z - 15. - 40. * abs(cell.a - .5)) * .03, 0., 1.));
} else { // fill
color = fill;
}
} else { // draw food
float fill = bg.r * .5;
if(camera.z > 15.) {
float pattern = mod(floor(trans.x) + floor(trans.y), 2.) == 0. ? trans.x + trans.y : trans.x - trans.y;
pattern = .5 + .5 * cos(pattern * $pi2 * 3.);
pattern = bg.r < .5 ? (.25 * step(pattern, bg.r * 2.)) : (.25 + .25 * step(pattern, bg.r * 2. - 1.));
color = vec3(mix(fill, pattern, min((camera.z - 15.) * .01, 1.)));
} else color = vec3(fill);
}
gl_FragColor = vec4(vec3(color + vec3(grid * .4)), 1);
}
</script>
<script type="x-shader/x-fragment" id="debug">
uniform vec3 camera;
uniform sampler2D background, cells;
uniform int channel;
void main(void) {
vec2 p = (gl_FragCoord.xy + camera.xy) / camera.z;
float r;
// fract(p.x * $invWidth); // test
if(channel == 1) r = texture2D(background, p * $invSize).r; else
if(channel == 2) r = texture2D(background, p * $invSize).g; else
if(channel == 3) r = texture2D(background, p * $invSize).b; else
if(channel == 4) r = texture2D(background, p * $invSize).a; else
if(channel == 5) r = texture2D(cells, p * $invSize).r; else
if(channel == 6) r = texture2D(cells, p * $invSize).g; else
if(channel == 7) r = texture2D(cells, p * $invSize).b; else
if(channel == 8) r = texture2D(cells, p * $invSize).a; else
r = 0.;
r = r * 255. / 256. + $half;
p = fract(p);
vec3 clr;
if(any(greaterThan(abs(p - .5), vec2(.45)))) clr = vec3(0., 0., .5);
else {
vec4 row = p.y > .5 ? step(.5, fract(r * vec4(128., 64., 32., 16.))) : step(.5, fract(r * vec4(8., 4., 2., 1.)));
clr = vec3(p.x < .5 ? (p.x < .25 ? row.r : row.g) : (p.x < .75 ? row.b : row.a));
}
gl_FragColor = vec4(clr, 1.);
}
</script>
<script type="x-shader/x-fragment" id="decide">
uniform sampler2D background, cells, entropy;
uniform vec2 seed;
float max(vec4 v) { vec2 m2 = max(v.rg, v.ba); return max(m2.r, m2.g); }
float min(vec4 v) { vec2 m2 = min(v.rg, v.ba); return min(m2.r, m2.g); }
int select(bvec2 candidates, float rnd) { return (candidates.x && (!candidates.y || rnd > .5)) ? 1 : 2; }
int select(bvec4 candidates, vec2 rnd) {
return any(candidates.rg) && ((!any(candidates.ba)) || (rnd.r > .5)) ? select(candidates.rg, rnd.g) : (select(candidates.ba, rnd.g) * 4);
}
ivec3 /* ( action, direction, state )*/
d1( float food, float tbd, int species, float mem, float energy, float protection,
vec4 rnd,
vec4 prox_food, vec4 prox_tbd, ivec4 prox_species, vec4 prox_mem, vec4 prox_energy, vec4 prox_protect
){
bvec4 vacancies = equal(prox_species, ivec4(0));
bvec4 friends = equal(prox_species, ivec4(species));
bvec4 ennemies = equal( ivec4(friends) + ivec4(vacancies), ivec4(0) );
vec4 vacant_food = prox_food * vec4(vacancies);
float max_vacant_food = max(vacant_food);
bvec4 pos_vacant_food = equal(vacant_food, vec4(max_vacant_food));
if(protection < $1 && energy > ($costBuild + $1)) return ivec3($_build, 0, 0);
if(any(ennemies)) {
if(any(friends)) return ivec3($_take, select(ennemies, rnd.rg), 0);
if(any(vacancies)) {
if(rnd.r < energy) return ivec3($_take, select(ennemies, rnd.gb), 0);
else return ivec3($_move, select(vacancies, rnd.gb), 0);
}
return ivec3($_die, 0, 0);
}
if(!any(friends)) {
if(food > 2. * energy) return ivec3($_eat, 0, 0);
if(energy > ($costMove + $1) && any(vacancies) && rnd.r < .1) return ivec3($_move, select(pos_vacant_food, rnd.gb), 0);
return ivec3($_eat, 0, 0);
} else {
float min_friend = min(prox_energy + vec4(not(friends)));
if(energy > 2. * min_friend) return ivec3($_give, select(equal(prox_energy + vec4(not(friends)), vec4(min_friend)) , rnd.rg), 0);
if(energy > 2. * protection) return ivec3($_build, 0, 0);
if(energy > ($costClone + $1) && any(vacancies)) return ivec3($_clone, select(vacancies, rnd.rg), 0);
if(rnd.r < .1 && (!any(friends.rgb) || !any(friends.gba) || !any(friends.rba) || !any(friends.rga)) && max_vacant_food > 2. * food)
return ivec3($_move, select(pos_vacant_food, rnd.ba), 0);
return ivec3($_eat, 0, 0);
}
}
void main(void) {
// fetch data here
vec2 pos = gl_FragCoord.xy * $invSize;
vec4 bg = texture2D(background, pos);
vec4 cell = texture2D(cells, pos);
// regenerate food
vec4 rnd = texture2D(entropy, pos + seed);
if(texture2D(entropy, pos + seed).r < $probaRegenerate) bg.r += $1;
if(cell.r != 0.) {
// fetch proximity data
vec2 bg_left = texture2D(background, pos + vec2(-$invWidth, 0.)).rg;
vec2 bg_right = texture2D(background, pos + vec2( $invWidth, 0.)).rg;
vec2 bg_up = texture2D(background, pos + vec2(0.,-$invHeight)).rg;
vec2 bg_down = texture2D(background, pos + vec2(0., $invHeight)).rg;
vec4 ce_left = texture2D(cells, pos + vec2(-$invWidth, 0.));
vec4 ce_right = texture2D(cells, pos + vec2( $invWidth, 0.));
vec4 ce_up = texture2D(cells, pos + vec2(0., -$invHeight));
vec4 ce_down = texture2D(cells, pos + vec2(0., $invHeight));
// transpose proximity
vec4 food = vec4(bg_left.r, bg_right.r, bg_up.r, bg_down.r);
ivec4 species = ivec4( vec4(ce_left.r, ce_right.r, ce_up.r, ce_down.r) * 256. );
vec4 tbd = vec4(bg_left.g, bg_right.g, bg_up.g, bg_down.g);
vec4 mems = vec4(ce_left.g, ce_right.g, ce_up.g, ce_down.g);
vec4 energy = vec4(ce_left.b, ce_right.b, ce_up.b, ce_down.b);
vec4 protection = vec4(ce_left.a, ce_right.a, ce_up.a, ce_down.a);
// call decision function
float f = bg.r; // food
float t = bg.g; // tbd
int s = int(cell.r * 256.); // species
float m = cell.g; // memory
float e = cell.b; // energy
float p = cell.a; // protection
ivec3 decision;
/*
if(s == 1) decision = d1(bg.rg, cell, rnd, food, tbd, species, states, energy, protection); else
if(s == 2) decision = d2(bg.rg, cell, rnd, food, tbd, species, states, energy, protection); else
decision = ivec3(0);*/
decision = d1(f, t, s, m, e, p, rnd, food, tbd, species, mems, energy, protection);
// die if trying a too expensive action /// TODO: not all or nothing for draw/build
if((decision.r == $_draw && cell.a < $costDraw)
|| (decision.r == $_build && cell.b < $costBuild)
|| (decision.r == $_move && cell.b < $costMove)
|| (decision.r == $_give && cell.b < $costGive)
|| (decision.r == $_clone && cell.b < $costClone)
) decision = ivec3($_die, 0, 0);
// revert moves/clones towards occupied positions
else if(decision.r == $_move || decision.r == $_clone) {
if((decision.g == 1 && species.r != 0)
|| (decision.g == 2 && species.g != 0)
|| (decision.g == 4 && species.b != 0)
|| (decision.g == 8 && species.a != 0)
) decision.rg = ivec2(0);
}
// eating consumes food from background
else if(decision.r == $_eat) { if(bg.r < $costEat) decision.r = 0; else bg.r -= $costEat; }
// write results
gl_FragColor = vec4(bg.rg, float(decision.b) * $1, float(decision.r) * $1 + float(decision.g) * $16);
} else gl_FragColor = vec4(bg.rg, vec2(0.));
}
</script>
<script type="x-shader/x-fragment" id="resolve">
uniform sampler2D background, cells, entropy;
uniform vec2 seed;
float select2(bvec2 candidates, float rnd) {
if(rnd > .5) return candidates.r ? 2. : 1.;
else return candidates.g ? 1. : 2.;
}
float select4(bvec4 candidates, vec4 rnd) {
if(rnd.r > .5) return any(candidates.rg) ? select2(candidates.rg, rnd.g) : 4. * select2(candidates.ba, rnd.g);
else return any(candidates.ba) ? 4. * select2(candidates.ba, rnd.g) : select2(candidates.rg, rnd.g);
}
float select(vec4 neighborhood, vec4 rnd) {
ivec4 actions = ivec4(mod(neighborhood + $half, $16) * 255.);
actions *= ivec4(equal( ivec4(neighborhood * 16. + .5), ivec4(2, 1, 8, 4) ));
// cloning has priofity over moves
bvec4 isClone = equal(actions, ivec4($_clone));
if(any(isClone)) return select4(isClone, rnd);
bvec4 isMove = equal(actions, ivec4($_move));
if(any(isMove)) return select4(isMove, rnd);
return 0.; // no conflicting actions
}
void main(void) {
vec2 pos = gl_FragCoord.xy * $invSize;
vec4 bg = texture2D(background, pos);
vec4 cell = texture2D(cells, pos);
if(cell.r == 0.) {
gl_FragColor = vec4(bg.rgb, $16 * select(
vec4(
texture2D(background, pos + vec2(-$invWidth, 0.)).a,
texture2D(background, pos + vec2( $invWidth, 0.)).a,
texture2D(background, pos + vec2(0., -$invHeight)).a,
texture2D(background, pos + vec2(0., $invHeight)).a
),
texture2D(entropy, pos + seed)
));
} else gl_FragColor = bg;
}
</script>
<script type="x-shader/x-fragment" id="act">
uniform sampler2D background, cells, entropy;
uniform vec2 seed;
vec2 taken(float protect) { vec2 r; r.x = $taken - (r.y = min(protect, $taken)); return r; }
vec4 collateral(int action, vec4 here, vec4 source) {
if(here.a == 0.) { // create/move cell to empty position
if(action == $_move) return source - vec4(0., 0., $costMove, 0.);
if(action == $_clone) return vec4(source.r, 0., $initE, $initP);
} else { // interact between 2 cells
if(action == $_give) return here + vec4(0., 0., $gainGive, 0.);
if(action == $_take) return here - vec4(0., 0., taken(here.a));
}
return here;
}
void main(void) {
vec2 pos = gl_FragCoord.xy * $invSize;
vec4 cell = texture2D(cells, pos);
vec4 neighborhood = vec4( texture2D(background, pos + vec2(-$invWidth, 0.)).a,
texture2D(background, pos + vec2( $invWidth, 0.)).a,
texture2D(background, pos + vec2(0., -$invWidth)).a,
texture2D(background, pos + vec2(0., $invWidth)).a );
ivec4 actions = ivec4(mod(neighborhood + $half, $16) * 255.);
ivec4 directions = ivec4(neighborhood * 16. + .5);
if(cell.r != 0.) {
// set state
vec4 bg = texture2D(background, pos);
if(cell.r != 0.) cell.g = bg.b;
// revert conflicting actions that were not selected by "resolve"
int action = int(mod(bg.a + $half, $16) * 255.);
if(action == $_move || action == $_clone) {
int direction = int(bg.a * 16. + .5);
float ctrl_f;
if(direction == 1) ctrl_f = texture2D(background, pos + vec2(-$invWidth, 0.)).a; else
if(direction == 2) ctrl_f = texture2D(background, pos + vec2( $invWidth, 0.)).a; else
if(direction == 4) ctrl_f = texture2D(background, pos + vec2(0., -$invWidth)).a; else
if(direction == 8) ctrl_f = texture2D(background, pos + vec2(0., $invWidth)).a; else
ctrl_f = 0.;
if(direction != int(ctrl_f * 16.)) action = 0;
}
// apply first half of actions : on owner
if(action == $_eat) cell.b += $gainEat; else
if(action == $_draw) { cell.b += $gainDraw; cell.a -= $costDraw; } else
if(action == $_build) { cell.b -= $costBuild; cell.a += $gainDraw; } else
if(action == $_move) { cell = vec4(0.); }
if(action == $_give) { cell.b -= $costGive; } else
if(action == $_take) {
int direction = int(bg.a * 16. + .5);
vec4 other;
if(direction == 1) other = texture2D(cells, pos + vec2(-$invWidth, 0.)); else
if(direction == 2) other = texture2D(cells, pos + vec2( $invWidth, 0.)); else
if(direction == 4) other = texture2D(cells, pos + vec2(0., -$invWidth)); else
if(direction == 8) other = texture2D(cells, pos + vec2(0., $invWidth));
vec2 t = taken(other.a);
cell.b += t.x * $gainTake - t.y * $costTake;
} else
if(action == $_clone) { cell.b -= $costClone; } else
if(action == $_die) { cell = vec4(0.); }
}
// apply second half of actions : on affected neighboors
if(directions.r == 2) cell = collateral(actions.r, cell, texture2D(cells, pos + vec2(-$invWidth, 0.)));
if(directions.g == 1) cell = collateral(actions.g, cell, texture2D(cells, pos + vec2( $invWidth, 0.)));
if(directions.b == 8) cell = collateral(actions.b, cell, texture2D(cells, pos + vec2(0., -$invWidth)));
if(directions.a == 4) cell = collateral(actions.a, cell, texture2D(cells, pos + vec2(0., $invWidth)));
// final EP check
if(cell.r != 0.) {
if(cell.a < $1) cell.b -= $costNaked;
if(cell.b < $1) cell = vec4(0.);
} else cell = vec4(0.);
gl_FragColor = cell;
}
</script>
</head><body onload="entry()">
<canvas id="surface">
No WebGL!
</canvas>
</body></html>