gpu.js/examples/fluid.html at develop · gpujs/gpu.js · GitHub

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<!DOCTYPE html>

<head>

<title>SSPS - Chadams Studios (slightly upgraded)</title>

function XSSPS(particleCount, renderSize, onAfterInput) {

this.dt = 0;

this.renderSize = renderSize || 512;

this.particleCount = particleCount || 512;

this.onAfterInput = onAfterInput;

this.hashLength = 128;

this.hashWSize = 3.0;

this.hashBinLen = 128;

this.rayCount = 128;

this.rayDist = 20;

this.rfScale = 2.0;

this.restDensity = 0.1;

this.fieldLen = 4;

this.gConst = 0.02;

this.bound = 8;

this.shootIndex = 0;

this.keys = {};

this.canvas = document.createElement('canvas');

const gpu = this.gpu = new GPU({

canvas: this.canvas,

mode: 'gpu'

});

RENDER SUPPORT FUNCTIONS (GLSL)

gpu.addNativeFunction('raySphere',

`vec2 raySphere(vec3 r0, vec3 rd, vec3 s0, float sr) {

float a = dot(rd, rd);

vec3 s0_r0 = r0 - s0;

float b = 2.0 * dot(rd, s0_r0);

float c = dot(s0_r0, s0_r0) - (sr * sr);

float test = b*b - 4.0*a*c;

if (test < 0.0) {

return vec2(-1.0, 0.);

}

test = sqrt(test);

float X = (-b - test)/(2.0*a);

float Y = (-b + test)/(2.0*a);

return vec2(

Y-X

);

gpu.addNativeFunction('getRay0',

`vec3 getRay0(vec2 uv, vec3 c0, vec3 cd, vec3 up, float s0, float s1, float slen) {

up = normalize(cross(cross(cd, up), cd));

vec3 vup = normalize(cross(cd, up));

vec3 vleft = up;

vec2 X = (uv - vec2(0.5, 0.5)) * s0;

return c0 + vup * X.y + vleft * X.x;

);

gpu.addNativeFunction('getRayDir',

`vec3 getRayDir(vec3 R0, vec2 uv, vec3 c0, vec3 cd, vec3 up, float s0, float s1, float slen) {

up = normalize(cross(cross(cd, up), cd));

vec3 vup = normalize(cross(cd, up));

vec3 vleft = up;

vec2 X = (uv - vec2(0.5, 0.5)) * s1;

vec3 far = vup * X.y + vleft * X.x;

return normalize((normalize(cd) * slen + far + c0) - R0);

);

gpu.addNativeFunction('reflectWrap',

`vec3 reflectWrap(vec3 I, vec3 N) {

return normalize(reflect(normalize(I), normalize(N)));

);

gpu.addNativeFunction('refractWrap',

`vec3 refractWrap(vec3 I, vec3 N, float eta) {

return normalize(refract(normalize(I), normalize(N), eta));

);

gpu.addNativeFunction('distanceWrap',

`float distanceWrap(vec3 A, vec3 B) {

return length(A - B);

);

UPDATE SUPPORT FUNCTIONS (GLSL)

gpu.addNativeFunction('compGravity',

`vec3 compGravity(vec3 M, vec3 J, float jMass, float f) {

vec3 delta = J - M;

float dlen = length(delta);

if (dlen > 0.05) {

float dlen2 = jMass / (max(dlen*dlen, 1.) * 0.1);

return dlen2 * (delta / dlen) * f;

}

return vec3(0., 0., 0.);

);

gpu.addNativeFunction('partDensity',

`vec2 partDensity(vec3 M, vec3 J, float fLen) {

vec3 delta = J - M;

float len = length(delta);

if (len < fLen) {

float t = 1. - (len / fLen);

return vec2(t*t, t*t*t);

}

return vec2(0., 0.);

);

gpu.addNativeFunction('pressForce',

`vec3 pressForce(vec3 M, vec3 J, vec3 Mv, vec3 Jv, float fLen, float dt, float spressure, float snpressure, float viscdt) {

vec3 delta = J - M;

float len = length(delta);

if (len < fLen) {

float t = 1. - (len / fLen);

delta *= dt * t * (spressure + snpressure * t) / (2. * len);

vec3 deltaV = Jv - Mv;

deltaV *= dt * t * viscdt;

return -(delta - deltaV);

}

return vec3(0., 0., 0.);

);

INIT SUPPORT FUNCTIONS

gpu.addNativeFunction('random',

`float random(float sequence, float seed) {

return fract(sin(dot(vec2(seed, sequence), vec2(12.9898, 78.233))) * 43758.5453);

);

VELOCITY UPDATE KERNEL

this.updateVelocity = gpu.createKernel(function(

positions,

velocities,

attrs,

pullMass,

camP,

camDir,

moveTPullR,

oDensity,

oVisc,

oMass,

oIncomp,

) {

var playerPos = [

camP[0] + camDir[0] * moveTPullR,

camP[1] + camDir[1] * moveTPullR,

camP[2] + camDir[2] * moveTPullR,

];

// Unpack particle

var comp = this.thread.x % 3;

var me = (this.thread.x - comp) / 3;

var mx = positions[me*3],

my = positions[me*3+1],

mz = positions[me*3+2];

var mpos = [mx, my, mz];

var mvx = velocities[me*3],

mvy = velocities[me*3+1],

mvz = velocities[me*3+2];

var mvel = [mvx, mvy, mvz];

var mmass = oMass;

var incomp = oIncomp;

var viscdt = oVisc;

var ddensity = 0.0,

nddensity = 0.0;

// Compute pressure on this particle

for (var i=0; i<this.constants.particleCount; i++) {

var opos = [positions[i*3], positions[i*3+1], positions[i*3+2]];

var density = oDensity;

var dret = partDensity(mpos, opos, this.constants.fieldLen);

ddensity += dret[0] * density;

nddensity += dret[1] * density;

}

// Interact with player by adding pressure

var opos = [playerPos[0], playerPos[1], playerPos[2]];

var fl2 = this.constants.fieldLen;

var pf = [0, 0];

if (pullMass > 0.0) {

pf = partDensity(mpos, opos, fl2);

}

ddensity += pf[0] * (pullMass / 10.0 * this.constants.restDensity);

nddensity += pf[1] * (pullMass / 10.0 * this.constants.restDensity);

var spressure = (ddensity - this.constants.restDensity) * incomp;

var snpressure = nddensity * incomp;

// Compute force from pressure on this particle

var ret = [mvx, mvy, mvz];

for (var i=0; i<this.constants.particleCount; i++) {

if (i - me > 0.01) {

var opos = [positions[i*3], positions[i*3+1], positions[i*3+2]];

var ovel = [velocities[i*3], velocities[i*3+1], velocities[i*3+2]];

var mass = oMass;

var jmf = (2. * mass) / (mass + mmass);

var dret = pressForce(mpos, opos, mvel, ovel, this.constants.fieldLen, dt, spressure, snpressure, viscdt);

ret[0] += dret[0] * jmf; ret[1] += dret[1] * jmf; ret[2] += dret[2] * jmf;

}

// Player pressure

if (pullMass > 0.0) {

var opos = [playerPos[0], playerPos[1], playerPos[2]];

var ovel = [0, 0, 0];

var mass = 1.0;

var jmf = (2. * mass) / (mass + mmass);

var dret = pressForce(mpos, opos, mvel, ovel, this.constants.fieldLen, dt, spressure, snpressure, viscdt);

ret[0] += dret[0] * jmf;

ret[1] += dret[1] * jmf;

ret[2] += dret[2] * jmf;

}

// Compute gravitational force on this particle

var gf = this.constants.gConst * dt * 0.1;

for (var i=0; i<this.constants.particleCount; i++) {

var opos = [positions[i*3], positions[i*3+1], positions[i*3+2]];

var mass = attrs[i*6+2];

var dret = compGravity(mpos, opos, mass, gf);

ret[0] += dret[0]; ret[1] += dret[1]; ret[2] += dret[2];

}

// Enforce scene boundaries

if (ret[0] < 0 && mpos[0] < -this.constants.bound) {

ret[0] = -ret[0];

} else if (ret[0] > 0 && mpos[0] > this.constants.bound) {

ret[0] = -ret[0];

}

if (ret[1] < 0 && mpos[1] < -this.constants.bound) {

ret[1] = -ret[1];

} else if (ret[1] > 0 && mpos[1] > this.constants.bound) {

ret[1] = -ret[1];

}

if (ret[2] < 0 && mpos[2] < -this.constants.bound) {

ret[2] = -ret[2];

} else if (ret[2] > 0 && mpos[2] > this.constants.bound) {

ret[2] = -ret[2];

}

if (comp < 0.01) {

return ret[0];

} else if (comp < 1.01) {

return ret[1];

} else if (comp < 2.01) {

return ret[2];

}

}, {

constants: {

particleCount: this.particleCount,

bound: this.bound,

fieldLen: this.fieldLen,

gConst: this.gConst,

restDensity: ((4 / 3) * Math.PI * Math.pow(this.fieldLen, 3)) * this.restDensity

loopMaxIterations: this.particleCount,

output: [ this.particleCount*3 ],

pipeline: true,

tactic: 'speed',

immutable: true,

});

SET POSITION/VELOCITES

this.setPosition = gpu.createKernel(function(list, index, camP, camDir, amount) {

if (Math.abs(index - Math.floor(this.thread.x / this.constants.pitch)) < 0.01) {

const i = this.thread.x % this.constants.pitch;

return camP[i] + camDir[i] * amount;

} else {

return list[this.thread.x];

}

}, {

output: [ this.particleCount * 3 ],

pipeline: true,

constants: { particleCount: this.particleCount, pitch: 3 },

loopMaxIterations: this.particleCount,

tactic: 'speed',

immutable: true,

});

this.setVelocity = gpu.createKernel(function(list, index, camDir, amount) {

if (Math.abs(index - Math.floor(this.thread.x / this.constants.pitch)) < 0.01) {

return camDir[this.thread.x % this.constants.pitch] * amount;

} else {

return list[this.thread.x];

}

}, {

output: [ this.particleCount * 3 ],

pipeline: true,

constants: { particleCount: this.particleCount, pitch: 3 },

loopMaxIterations: this.particleCount,

tactic: 'speed',

immutable: true,

});

POSITION UPDATE KERNEL

this.updatePosition = gpu.createKernel(function(positions, velocities, dt) {

return positions[this.thread.x] + velocities[this.thread.x] * dt;

}, {

output: [ this.particleCount * 3 ],

pipeline: true,

loopMaxIterations: this.particleCount,

tactic: 'speed',

immutable: true,

});

this.rotateCamera = gpu.createKernel(function(rotLR, rotUD, camCenter, camDir, camUp, camNearWidth, camFarWidth, camDist) {

var uv = [0.5+rotLR, 0.5+rotUD];

var CC = [camCenter[0], camCenter[1], camCenter[2]],

CD = [camDir[0], camDir[1], camDir[2]],

CU = [camUp[0], camUp[1], camUp[2]];

var ray0 = getRay0(uv, CC, CD, CU, camNearWidth, camFarWidth, camDist);

var rayDir = getRayDir(ray0, uv, CC, CD, CU, camNearWidth, camFarWidth, camDist);

if (this.thread.x === 0) {

return rayDir[0];

} else if (this.thread.x === 1) {

return rayDir[1];

} else {

return rayDir[2];

}

}, {

output: [ 3 ],

tactic: 'speed',

pipeline: true,

immutable: true,

});

this.updateCameraPosition = gpu.createKernel(function(camDir, camP, moveTFR, dt) {

var dlen = Math.sqrt(

(camDir[0] * camDir[0])

+ (camDir[1] * camDir[1])

+ (camDir[2] * camDir[2])

);

return camP[this.thread.x] + (camDir[this.thread.x] / dlen) * moveTFR * dt * 6;

}, {

output: [3],

tactic: 'speed',

pipeline: true,

immutable: true,

});

RENDER KERNEL

this.renderMode = 0;

this.renderKernel = [

gpu.createKernel(function(positions, camCenter, camDir, camUp, camNearWidth, camFarWidth, camDist) {

let uv = [this.thread.x / (this.constants.renderSize-1), this.thread.y / (this.constants.renderSize-1)];

let CC = [camCenter[0], camCenter[1], camCenter[2]],

CD = [camDir[0], camDir[1], camDir[2]],

CU = [camUp[0], camUp[1], camUp[2]];

let ray0 = getRay0(uv, CC, CD, CU, camNearWidth, camFarWidth, camDist);

let rayDir = getRayDir(ray0, uv, CC, CD, CU, camNearWidth, camFarWidth, camDist);

this.color(0., 0., 0., 1.);

let outClr = [

0., 0., 0.

];

let ds = 0.0;

let done = 0.0;

let norm = [0., 0., 0.];

for (let i=0; i<this.constants.ICOUNT; i++) {

if (done < 0.5) {

let rnow = [

ray0[0] + rayDir[0] * ds,

ray0[1] + rayDir[1] * ds,

ray0[2] + rayDir[2] * ds

];

norm[0] = 0.; norm[1] = 0.; norm[2] = 0.;

let m = 0.0;

let fq = 0.0;

let nt = 0.0;

let dmin = 1000.0;

for (let j=0; j<this.constants.particleCount; j++) {

let off = j * 3;

let dx = positions[off], dy = positions[off+1.], dz = positions[off+2.];

dx -= rnow[0]; dy -= rnow[1]; dz -= rnow[2];

let r = Math.sqrt(dx*dx + dy*dy + dz*dz);

let x = r / this.constants.rfScale;

if (x < 1.0) {

let q = 1.0 - x*x*x*(x*(x*6.0-15.0)+10.0);

norm[0] += (dx/r) * q;

norm[1] += (dy/r) * q;

norm[2] += (dz/r) * q;

fq += q;

nt += q;

m += 1.0;

}

else {

dmin = Math.min(dmin, r - this.constants.rfScale);

}

let dist = dmin + 0.1;

norm[0] /= nt; norm[1] /= nt; norm[2] /= nt;

if (m > 0.5) {

dist = (0.5333 * this.constants.rfScale) * (0.5 - fq);

}

ds += dist;

if (dist < 0.01) {

done = 1.0;

}

if (ds >= this.constants.rayDist) {

done = 1.0;

}

ds = Math.min(ds, this.constants.rayDist);

let ref = refractWrap(norm, rayDir, 1./1.5);

let dot = ref[0] * rayDir[0] + ref[1] * rayDir[1] + ref[2] * rayDir[2];

let int = (1. - Math.pow(ds / this.constants.rayDist, 1.5));

let light = Math.min(1., Math.max(dot*dot, 0.)) * int;

outClr[2] = int + light;

outClr[1] = light;

outClr[0] = light;

this.color(Math.min(outClr[0], 1.), Math.min(outClr[1], 1.), Math.min(outClr[2], 1.), 1.);

}, {

graphical: true,

constants: {

rayDist: this.rayDist,

rfScale: this.rfScale,

bound: this.bound,

renderSize: this.renderSize,

particleCount: this.particleCount,

ICOUNT: 48

loopMaxIterations: 48 * this.particleCount,

output: [this.renderSize, this.renderSize],

tactic: 'speed',

}),

gpu.createKernel(function(positions, camCenter, camDir, camUp, camNearWidth, camFarWidth, camDist) {

let uv = [this.thread.x / (this.constants.renderSize-1), this.thread.y / (this.constants.renderSize-1)];

let CC = [camCenter[0], camCenter[1], camCenter[2]],

CD = [camDir[0], camDir[1], camDir[2]],

CU = [camUp[0], camUp[1], camUp[2]];

let ray0 = getRay0(uv, CC, CD, CU, camNearWidth, camFarWidth, camDist);

let rayDir = getRayDir(ray0, uv, CC, CD, CU, camNearWidth, camFarWidth, camDist);

this.color(0., 0., 0., 1.);

let outClr = [

0., 0., 0.

];

let ds = 0.0;

let done = 0.0;

let norm = [0., 0., 0.];

for (let i=0; i<this.constants.ICOUNT; i++) {

if (done < 0.5) {

let rnow = [

ray0[0] + rayDir[0] * ds,

ray0[1] + rayDir[1] * ds,

ray0[2] + rayDir[2] * ds

];

norm[0] = 0.; norm[1] = 0.; norm[2] = 0.;

let m = 0.0;

let fq = 0.0;

let nt = 0.0;

let dmin = 1000.0;

for (let j=0; j<this.constants.particleCount; j++) {

let off = j * 3;

let dx = positions[off], dy = positions[off+1.], dz = positions[off+2.];

dx -= rnow[0]; dy -= rnow[1]; dz -= rnow[2];

let r = Math.sqrt(dx*dx + dy*dy + dz*dz);

let x = r / this.constants.rfScale;

if (x < 1.0) {

let q = 1.0 - x*x*x*(x*(x*6.0-15.0)+10.0);

norm[0] += (dx/r) * q;

norm[1] += (dy/r) * q;

norm[2] += (dz/r) * q;

fq += q;

nt += q;

m += 1.0;

}

else {

dmin = Math.min(dmin, r - this.constants.rfScale);

}

let dist = dmin + 0.1;

norm[0] /= nt; norm[1] /= nt; norm[2] /= nt;

if (m > 0.5) {

dist = (0.5333 * this.constants.rfScale) * (0.5 - fq);

}

ds += dist;

if (dist < 0.01) {

done = 1.0;

}

if (ds >= this.constants.rayDist) {

done = 1.0;

}

ds = Math.min(ds, this.constants.rayDist);

let ref = refractWrap(norm, rayDir, 1./1.5);

let dot = ref[0] * rayDir[0] + ref[1] * rayDir[1] + ref[2] * rayDir[2];

let int = (1. - Math.pow(ds / this.constants.rayDist, 1.5));

let light = Math.min(1., Math.max(dot*dot, 0.)) * int;

outClr[2] = int + light;

outClr[1] = light;

outClr[0] = light;

if (ds < (this.constants.rayDist - 0.001)) {

ray0[0] += rayDir[0] * ds;

ray0[1] += rayDir[1] * ds;

ray0[2] += rayDir[2] * ds;

let ds = 0.00;

let done = 0.0;

let nrayDir = [-norm[0], -norm[1], -norm[2]];

nrayDir = reflectWrap(nrayDir, rayDir);

norm = [0., 0., 0.];

ray0[0] += nrayDir[0] * 0.01;

ray0[1] += nrayDir[1] * 0.01;

ray0[2] += nrayDir[2] * 0.01;

for (let i=0; i<this.constants.ICOUNTR; i++) {

if (done < 0.5) {

let rnow = [

ray0[0] + nrayDir[0] * ds,

ray0[1] + nrayDir[1] * ds,

ray0[2] + nrayDir[2] * ds

];

norm[0] = 0.; norm[1] = 0.; norm[2] = 0.;

let m = 0.0;

let fq = 0.0;

let nt = 0.0;

let dmin = 1000.0;

for (let j=0; j<this.constants.particleCount; j++) {

let off = j * 3;

let dx = positions[off], dy = positions[off+1.], dz = positions[off+2.];

dx -= rnow[0]; dy -= rnow[1]; dz -= rnow[2];

let r = Math.sqrt(dx*dx + dy*dy + dz*dz);

let x = r / this.constants.rfScale;

if (x < 1.0) {

let q = 1.0 - x*x*x*(x*(x*6.0-15.0)+10.0);

norm[0] += (dx/r) * q;

norm[1] += (dy/r) * q;

norm[2] += (dz/r) * q;

fq += q;

nt += q;

m += 1.0;

} else {

dmin = Math.min(dmin, r - this.constants.rfScale);

}

let dist = dmin + 0.1;

norm[0] /= nt; norm[1] /= nt; norm[2] /= nt;

if (m > 0.5) {

dist = (0.5333 * this.constants.rfScale) * (0.5 - fq);

}

ds += dist;

if (dist < 0.001) {

done = 1.0;

}

if (ds >= this.constants.rayDistRef) {

done = 1.0;

}

ds = Math.min(ds, this.constants.rayDistRef);

if (ds < (this.constants.rayDistRef - 0.001)) {

let ref = refractWrap(norm, nrayDir, 1./1.5);

let dot = ref[0] * nrayDir[0] + ref[1] * nrayDir[1] + ref[2] * nrayDir[2];

let int = 1. - Math.pow(Math.abs(ds) / this.constants.rayDistRef, 1.5);

let light = Math.min(1., Math.max(dot*dot, 0.)) * int;

outClr[2] += (int + light) * 0.1;

outClr[1] += (light) * 0.1;

outClr[0] += (light) * 0.1;

}

this.color(Math.min(outClr[0], 1.), Math.min(outClr[1], 1.), Math.min(outClr[2], 1.), 1.);

}, {

graphical: true,

constants: {

rayCount: this.rayCount,

rayDist: this.rayDist,

rayDistRef: Math.floor(this.rayDist / 4),

rfScale: this.rfScale,

bound: this.bound,

renderSize: this.renderSize,

particleCount: this.particleCount,

ICOUNT: 48,

ICOUNTR: 24

loopMaxIterations: 48 * this.particleCount,

output: [this.renderSize, this.renderSize],

tactic: 'speed',

})

];

INIT KERNEL

const seedPositions = gpu.createKernel(function(){

var t = random(Math.floor(this.thread.x / 3), this.constants.seed + 0.5);

var r = t * this.constants.maxr;

var a = 3.141592 * 2.0 * random(Math.floor(this.thread.x / 3), this.constants.seed + 1.5);

var comp = this.thread.x % 3;

if (comp < 0.01) {

return Math.cos(a) * r;

} else if (comp < 1.01) {

return Math.sin(a) * r;

} else {

return 0.0;

}

}, {

constants: {

maxr: 25,

seed: Math.random() * 1e6,

particleCount: this.particleCount

pipeline: true,

output: [this.particleCount * 3],

tactic: 'speed',

});

const seedVelocities = gpu.createKernel(function(){

var t = random(this.thread.x, this.constants.seed + 0.5);

return (t - 0.5) * this.constants.iv;

}, {

constants: {

iv: 1.5,

seed: Math.random() * 1e6,

particleCount: this.particleCount,

pipeline: true,

output: [this.particleCount * 3],

tactic: 'speed',

});

this.sDensity = [0.125, 0.25, 0.5, 1.0, 1.5, 2.0];

this.sDensityI = 5;

this.sMass = [0.05, 0.1, 0.2, 0.4, 0.8];

this.sMassI = 2;

this.sIncomp = [1.0, 0.8, 0.6, 0.4, 0.2];

this.sIncompI = 3;

this.sVisc = [0.05, 0.1, 0.25, 0.35, 0.5, 0.75, 0.95];

this.sViscI = 0;

const seedAttrs = gpu.createKernel(function(){

var comp = this.thread.x % 6;

if (comp < 0.01) {

return 0.25; // radius

} else if (comp < 1.01) {

return 0.5; // density

} else if (comp < 2.01) {

return 0.2; // mass

} else if (comp < 3.01) {

return 0.8; // incompress

} else if (comp < 4.01) {

return 0.35; // visc

} else {

// type

if (Math.floor(this.thread.x / 6) > (this.constants.particleCount-33)) {

return 1.0;

} else {

return 0.0;

}

}, {

constants: {

iv: 50,

seed: Math.random() * 1e6,

particleCount: this.particleCount

pipeline: true,

output: [this.particleCount * 6],

tactic: 'speed',

});

* Seed Particles

this.reset = () => {

this.cam = {

p: [0, 0, 17.5],

dir: [0, 0, -1],

up: [0, 1, 0],

nearW: 0.0001,

farW: 1000,

farDist: 1000

};

this.move = {

toLR: 0,

toUD: 0,

toFR: 0,

tLR: 0,

tUD: 0,

tFR: 0,

toPull: 0,

tPull: 0,

toPullR: 0,

tPullR: 0

};

this.data = {

pos: seedPositions(),

vel: seedVelocities(),

attr: seedAttrs()

};

this.reset();

this.hash = [];

for (let i=0; i<this.hashLength; i++) {

for (let j=0; j<this.hashBinLen; j++) {

this.hash.push(0); this.hash.push(0); this.hash.push(0); this.hash.push(-1);

}

this.normv = gpu.createKernel(function(a) {

const length = Math.sqrt(Math.abs(a[0]*a[0]) + Math.abs(a[1]*a[1]) + Math.abs(a[2]*a[2]));

return a[this.thread.x] / length;

}, {

output: [3],

pipeline: true,

tactic: 'speed',

immutable: true,

});

this.crossv = gpu.createKernel(function(a, b) {

const a1 = a[0], a2 = a[1], a3 = a[2];

const b1 = b[0], b2 = b[1], b3 = b[2];

if (this.thread.x === 0) {

return a2 * b3 - a3 * b2;

} else if (this.thread.x === 1) {

return a3 * b1 - a1 * b3;

} else {

return a1 * b2 - a2 * b1;

}

}, {

output: [3],

pipeline: true,

tactic: 'speed',

immutable: true,

});

}

XSSPS.prototype.hashFn = function(x, y, z) {

const max2 = Math.floor(this.bound * 2);

const ix = (Math.floor(x/this.hashWSize)) + max2,

iy = (Math.floor(y/this.hashWSize)) + max2,

iz = (Math.floor(z/this.hashWSize)) + max2;

return ((ix * 137) + (iy * 197) + (iz * 167)) % this.hashLength;

};

XSSPS.prototype.updateRender = function(keys, dt) {

this.dt = dt;

this.handleInput(keys);

this.sDensityI = this.sDensityI % this.sDensity.length;

this.sViscI = this.sViscI % this.sVisc.length;

this.sMassI = this.sMassI % this.sMass.length;

this.sIncompI = this.sIncompI % this.sIncomp.length;

const SUBSTEPS = 2;

for (let i=0; i<SUBSTEPS; i++) {

// Update velocities via gravity & pressure

const prevVel = this.data.vel;

this.data.vel = this.updateVelocity(

this.data.pos,

this.data.vel,

this.data.attr,

this.move.tPull,

this.cam.p,

this.cam.dir,

this.move.tPullR,

this.sDensity[this.sDensityI],

this.sVisc[this.sViscI],

this.sMass[this.sMassI],

this.sIncomp[this.sIncompI],

this.dt / SUBSTEPS

);

deleteTexture(prevVel);

// Update positions

const prevPos = this.data.pos;

this.data.pos = this.updatePosition(

this.data.pos,

this.data.vel,

this.dt / SUBSTEPS

);

deleteTexture(prevPos);

}

// Render

this.renderMode = this.renderMode % this.renderKernel.length;

this.renderKernel[this.renderMode](

this.data.pos,

this.cam.p,

this.cam.dir,

this.cam.up,

this.cam.nearW, this.cam.farW, this.cam.farDist

);

};

XSSPS.prototype.handleInput = function(keys) {

this.move.toLR = this.move.toFR = this.move.toUD = 0;

if (keys[37]) {

this.move.toLR -= 1;

}

if (keys[39]) {

this.move.toLR += 1;

}

if (keys[38]) {

this.move.toUD -= 1;

}

if (keys[40]) {

this.move.toUD += 1;

}

if (keys[83]) {

this.move.toFR -= 1;

}

if (keys[87]) {

this.move.toFR += 1;

}

if (this.keys[82] && !keys[82]) {

this.renderMode += 1;

}

if (this.keys[27] && !keys[27]) {

this.reset();

}

if (this.keys[49] && !keys[49]) {

this.sDensityI += 1;

}

if (this.keys[50] && !keys[50]) {

this.sViscI += 1;

}

if (this.keys[51] && !keys[51]) {

this.sMassI += 1;

}

if (this.keys[52] && !keys[52]) {

this.sIncompI += 1;

}

if (this.keys[32] && !keys[32]) {

const prevPos = this.data.pos;

this.data.pos = this.setPosition(

this.data.pos,

(this.particleCount-1) - this.shootIndex,

this.cam.p,

this.cam.dir,

0.5

);

deleteTexture(prevPos);

const prevVel = this.data.vel;

this.data.vel = this.setVelocity(

this.data.vel,

(this.particleCount-1) - this.shootIndex,

this.cam.dir,

);

deleteTexture(prevVel);

this.shootIndex = (this.shootIndex + 1) % 32;

}

if (keys[69]) {

this.move.toPull = 10;

this.move.toPullR = 5;

}

else {

this.move.toPull = -1;

this.move.toPullR = 0.25;

}

this.keys = {...keys};

this.move.tLR += (this.move.toLR - this.move.tLR) * this.dt * 1.5;

this.move.tUD += (this.move.toUD - this.move.tUD) * this.dt * 1.5;

this.move.tFR += (this.move.toFR - this.move.tFR) * this.dt * 1.5;

this.move.tPull += (this.move.toPull - this.move.tPull) * this.dt * 1.5;

this.move.tPullR += (this.move.toPullR - this.move.tPullR) * this.dt * 1.5;

this.updateCamera();

if (this.onAfterInput) this.onAfterInput();

};

XSSPS.prototype.updateCamera = function() {

const prevUp = this.cam.up;

const crossv1 = this.crossv(

this.cam.dir,

this.cam.up

);

const crossv2 = this.crossv(

crossv1,

this.cam.dir

);

deleteTexture(this.cam.up);

this.cam.up = this.normv(crossv2);

deleteTexture(crossv1);

deleteTexture(crossv2);

deleteTexture(prevUp);

const prevDir = this.cam.dir;

this.cam.dir = this.rotateCamera(

this.move.tLR / 35,

-this.move.tUD / 35,

this.cam.p,

this.cam.dir,

this.cam.up,

1, 3.5, 2

);

deleteTexture(prevDir);

const prevP = this.cam.p;

this.cam.p = this.updateCameraPosition(

this.cam.dir,

this.cam.p,

this.move.tFR,

this.dt

);

deleteTexture(prevP);

};

</script>

function SSPS(psim) {

this.dt = 0;

this.psim = psim;

this.keys = {};

this.controls = {};

this.buildControls();

}

SSPS.prototype.buildControls = function() {

let html = `<div>

SSPS by Chadams - <span id="fps"></span> fps - <span id="particle-count"></span> particles @ <span id="size"></span><br />

[W] - Forward, [S] - Reverse, [ARROWS] - Look<br />

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