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// Utilities
var Vector3 = {};
var Matrix44 = {};
Vector3.create = function(x, y, z) {
    return {'x':x, 'y':y, 'z':z};
};
Vector3.dot = function (v0, v1) {
    return v0.x * v1.x + v0.y * v1.y + v0.z * v1.z;
};
Vector3.cross = function (v, v0, v1) {
    v.x = v0.y * v1.z - v0.z * v1.y;
    v.y = v0.z * v1.x - v0.x * v1.z;
    v.z = v0.x * v1.y - v0.y * v1.x;
};
Vector3.normalize = function (v) {
    var l = v.x * v.x + v.y * v.y + v.z * v.z;
    if(l > 0.00001) {
        l = 1.0 / Math.sqrt(l);
        v.x *= l;
        v.y *= l;
        v.z *= l;
    }
};
Vector3.arrayForm = function(v) {
    if(v.array) {
        v.array[0] = v.x;
        v.array[1] = v.y;
        v.array[2] = v.z;
    }
    else {
        v.array = new Float32Array([v.x, v.y, v.z]);
    }
    return v.array;
};
Matrix44.createIdentity = function () {
    return new Float32Array([1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0]);
};
Matrix44.loadProjection = function (m, aspect, vdeg, near, far) {
    var h = near * Math.tan(vdeg * Math.PI / 180.0 * 0.5) * 2.0;
    var w = h * aspect;
    
    m[0] = 2.0 * near / w;
    m[1] = 0.0;
    m[2] = 0.0;
    m[3] = 0.0;
    
    m[4] = 0.0;
    m[5] = 2.0 * near / h;
    m[6] = 0.0;
    m[7] = 0.0;
    
    m[8] = 0.0;
    m[9] = 0.0;
    m[10] = -(far + near) / (far - near);
    m[11] = -1.0;
    
    m[12] = 0.0;
    m[13] = 0.0;
    m[14] = -2.0 * far * near / (far - near);
    m[15] = 0.0;
};
Matrix44.loadLookAt = function (m, vpos, vlook, vup) {
    var frontv = Vector3.create(vpos.x - vlook.x, vpos.y - vlook.y, vpos.z - vlook.z);
    Vector3.normalize(frontv);
    var sidev = Vector3.create(1.0, 0.0, 0.0);
    Vector3.cross(sidev, vup, frontv);
    Vector3.normalize(sidev);
    var topv = Vector3.create(1.0, 0.0, 0.0);
    Vector3.cross(topv, frontv, sidev);
    Vector3.normalize(topv);
    
    m[0] = sidev.x;
    m[1] = topv.x;
    m[2] = frontv.x;
    m[3] = 0.0;
    
    m[4] = sidev.y;
    m[5] = topv.y;
    m[6] = frontv.y;
    m[7] = 0.0;
    
    m[8] = sidev.z;
    m[9] = topv.z;
    m[10] = frontv.z;
    m[11] = 0.0;
    
    m[12] = -(vpos.x * m[0] + vpos.y * m[4] + vpos.z * m[8]);
    m[13] = -(vpos.x * m[1] + vpos.y * m[5] + vpos.z * m[9]);
    m[14] = -(vpos.x * m[2] + vpos.y * m[6] + vpos.z * m[10]);
    m[15] = 1.0;
};

//
var timeInfo = {
    'start':0, 'prev':0, // Date
    'delta':0, 'elapsed':0 // Number(sec)
};

//
var gl;
var renderSpec = {
    'width':0,
    'height':0,
    'aspect':1,
    'array':new Float32Array(3),
    'halfWidth':0,
    'halfHeight':0,
    'halfArray':new Float32Array(3)
    // and some render targets. see setViewport()
};
renderSpec.setSize = function(w, h) {
    renderSpec.width = w;
    renderSpec.height = h;
    renderSpec.aspect = renderSpec.width / renderSpec.height;
    renderSpec.array[0] = renderSpec.width;
    renderSpec.array[1] = renderSpec.height;
    renderSpec.array[2] = renderSpec.aspect;
    
    renderSpec.halfWidth = Math.floor(w / 2);
    renderSpec.halfHeight = Math.floor(h / 2);
    renderSpec.halfArray[0] = renderSpec.halfWidth;
    renderSpec.halfArray[1] = renderSpec.halfHeight;
    renderSpec.halfArray[2] = renderSpec.halfWidth / renderSpec.halfHeight;
};

function deleteRenderTarget(rt) {
    gl.deleteFramebuffer(rt.frameBuffer);
    gl.deleteRenderbuffer(rt.renderBuffer);
    gl.deleteTexture(rt.texture);
}

function createRenderTarget(w, h) {
    var ret = {
        'width':w,
        'height':h,
        'sizeArray':new Float32Array([w, h, w / h]),
        'dtxArray':new Float32Array([1.0 / w, 1.0 / h])
    };
    ret.frameBuffer = gl.createFramebuffer();
    ret.renderBuffer = gl.createRenderbuffer();
    ret.texture = gl.createTexture();
    
    gl.bindTexture(gl.TEXTURE_2D, ret.texture);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, w, h, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
    
    gl.bindFramebuffer(gl.FRAMEBUFFER, ret.frameBuffer);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, ret.texture, 0);
    
    gl.bindRenderbuffer(gl.RENDERBUFFER, ret.renderBuffer);
    gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, w, h);
    gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, ret.renderBuffer);
    
    gl.bindTexture(gl.TEXTURE_2D, null);
    gl.bindRenderbuffer(gl.RENDERBUFFER, null);
    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
    
    return ret;
}

function compileShader(shtype, shsrc) {
	var retsh = gl.createShader(shtype);
	
	gl.shaderSource(retsh, shsrc);
	gl.compileShader(retsh);
	
	if(!gl.getShaderParameter(retsh, gl.COMPILE_STATUS)) {
		var errlog = gl.getShaderInfoLog(retsh);
		gl.deleteShader(retsh);
		console.error(errlog);
		return null;
	}
	return retsh;
}

function useShader(prog) {
    gl.useProgram(prog);
    for(var attr in prog.attributes) {
        gl.enableVertexAttribArray(prog.attributes[attr]);;
    }
}

function unuseShader(prog) {
    for(var attr in prog.attributes) {
        gl.disableVertexAttribArray(prog.attributes[attr]);;
    }
    gl.useProgram(null);
}

/////
var projection = {
    'angle':60,
    'nearfar':new Float32Array([0.1, 100.0]),
    'matrix':Matrix44.createIdentity()
};
var camera = {
    'position':Vector3.create(0, 0, 100),
    'lookat':Vector3.create(0, 0, 0),
    'up':Vector3.create(0, 1, 0),
    'dof':Vector3.create(10.0, 4.0, 8.0),
    'matrix':Matrix44.createIdentity()
};

var pointFlower = {};
var meshFlower = {};
var sceneStandBy = false;

var BlossomParticle = function () {
    this.velocity = new Array(3);
    this.rotation = new Array(3);
    this.position = new Array(3);
    this.euler = new Array(3);
    this.size = 1.0;
    this.alpha = 1.0;
    this.zkey = 0.0;
};

BlossomParticle.prototype.setVelocity = function (vx, vy, vz) {
    this.velocity[0] = vx;
    this.velocity[1] = vy;
    this.velocity[2] = vz;
};

BlossomParticle.prototype.setRotation = function (rx, ry, rz) {
    this.rotation[0] = rx;
    this.rotation[1] = ry;
    this.rotation[2] = rz;
};

BlossomParticle.prototype.setPosition = function (nx, ny, nz) {
    this.position[0] = nx;
    this.position[1] = ny;
    this.position[2] = nz;
};

BlossomParticle.prototype.setEulerAngles = function (rx, ry, rz) {
    this.euler[0] = rx;
    this.euler[1] = ry;
    this.euler[2] = rz;
};

BlossomParticle.prototype.setSize = function (s) {
    this.size = s;
};

BlossomParticle.prototype.update = function (dt, et) {
    this.position[0] += this.velocity[0] * dt;
    this.position[1] += this.velocity[1] * dt;
    this.position[2] += this.velocity[2] * dt;
    
    this.euler[0] += this.rotation[0] * dt;
    this.euler[1] += this.rotation[1] * dt;
    this.euler[2] += this.rotation[2] * dt;
};

// effects
//common util
function createEffectProgram(vtxsrc, frgsrc, exunifs, exattrs) {
    var ret = {};
    var unifs = ['uResolution', 'uSrc', 'uDelta'];
    if(exunifs) {
        unifs = unifs.concat(exunifs);
    }
    var attrs = ['aPosition'];
    if(exattrs) {
        attrs = attrs.concat(exattrs);
    }
    
    ret.program = createShader(vtxsrc, frgsrc, unifs, attrs);
    useShader(ret.program);
    
    ret.dataArray = new Float32Array([
        -1.0, -1.0,
         1.0, -1.0,
        -1.0,  1.0,
         1.0,  1.0
    ]);
    ret.buffer = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, ret.buffer);
    gl.bufferData(gl.ARRAY_BUFFER, ret.dataArray, gl.STATIC_DRAW);
    
    gl.bindBuffer(gl.ARRAY_BUFFER, null);
    unuseShader(ret.program);
    
    return ret;
}

// basic usage
// useEffect(prog, srctex({'texture':texid, 'dtxArray':(f32)[dtx, dty]})); //basic initialize
// gl.uniform**(...); //additional uniforms
// drawEffect()
// unuseEffect(prog)
// TEXTURE0 makes src
function useEffect(fxobj, srctex) {
    var prog = fxobj.program;
    useShader(prog);
    gl.uniform3fv(prog.uniforms.uResolution, renderSpec.array);
    
    if(srctex != null) {
        gl.uniform2fv(prog.uniforms.uDelta, srctex.dtxArray);
        gl.uniform1i(prog.uniforms.uSrc, 0);
        
        gl.activeTexture(gl.TEXTURE0);
        gl.bindTexture(gl.TEXTURE_2D, srctex.texture);
    }
}
function drawEffect(fxobj) {
    gl.bindBuffer(gl.ARRAY_BUFFER, fxobj.buffer);
    gl.vertexAttribPointer(fxobj.program.attributes.aPosition, 2, gl.FLOAT, false, 0, 0);
    gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
}
function unuseEffect(fxobj) {
    unuseShader(fxobj.program);
}

var effectLib = {};
function createEffectLib() {
    
    var vtxsrc, frgsrc;
    //common
    var cmnvtxsrc = document.getElementById("fx_common_vsh").textContent;
    
    //background
    frgsrc = document.getElementById("bg_fsh").textContent;
    effectLib.sceneBg = createEffectProgram(cmnvtxsrc, frgsrc, ['uTimes'], null);
    
    // make brightpixels buffer
    frgsrc = document.getElementById("fx_brightbuf_fsh").textContent;
    effectLib.mkBrightBuf = createEffectProgram(cmnvtxsrc, frgsrc, null, null);
    
    // direction blur
    frgsrc = document.getElementById("fx_dirblur_r4_fsh").textContent;
    effectLib.dirBlur = createEffectProgram(cmnvtxsrc, frgsrc, ['uBlurDir'], null);
    
    //final composite
    vtxsrc = document.getElementById("pp_final_vsh").textContent;
    frgsrc = document.getElementById("pp_final_fsh").textContent;
    effectLib.finalComp = createEffectProgram(vtxsrc, frgsrc, ['uBloom'], null);
}

// background
function createBackground() {
    //console.log("create background");
}
function initBackground() {
    //console.log("init background");
}
function renderBackground() {
    gl.disable(gl.DEPTH_TEST);
    
    useEffect(effectLib.sceneBg, null);
    gl.uniform2f(effectLib.sceneBg.program.uniforms.uTimes, timeInfo.elapsed, timeInfo.delta);
    drawEffect(effectLib.sceneBg);
    unuseEffect(effectLib.sceneBg);
    
    gl.enable(gl.DEPTH_TEST);
}

// post process
var postProcess = {};
function createPostProcess() {
    //console.log("create post process");
}
function initPostProcess() {
    //console.log("init post process");
}

/////
var SceneEnv = {};
function createScene() {
    createEffectLib();
    createBackground();
    createPointFlowers();
    createPostProcess();
    sceneStandBy = true;
}

function initScene() {
    initBackground();
    initPointFlowers();
    initPostProcess();
    
    //camera.position.z = 17.320508;
    camera.position.z = pointFlower.area.z + projection.nearfar[0];
    projection.angle = Math.atan2(pointFlower.area.y, camera.position.z + pointFlower.area.z) * 180.0 / Math.PI * 2.0;
    Matrix44.loadProjection(projection.matrix, renderSpec.aspect, projection.angle, projection.nearfar[0], projection.nearfar[1]);
}

function renderScene() {
    //draw
    Matrix44.loadLookAt(camera.matrix, camera.position, camera.lookat, camera.up);
    
    gl.enable(gl.DEPTH_TEST);
    
    //gl.bindFramebuffer(gl.FRAMEBUFFER, null);
    gl.bindFramebuffer(gl.FRAMEBUFFER, renderSpec.mainRT.frameBuffer);
    gl.viewport(0, 0, renderSpec.mainRT.width, renderSpec.mainRT.height);
    gl.clearColor(0.005, 0, 0.05, 0);
    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
    
    renderBackground();
    renderPointFlowers();
    renderPostProcess();
}

/////
function onResize(e) {
    makeCanvasFullScreen(document.getElementById("sakura"));
    setViewports();
    if(sceneStandBy) {
        initScene();
    }
}

function setViewports() {
    renderSpec.setSize(gl.canvas.width, gl.canvas.height);
    
    gl.clearColor(0.2, 0.2, 0.5, 1.0);
    gl.viewport(0, 0, renderSpec.width, renderSpec.height);
    
    var rtfunc = function (rtname, rtw, rth) {
        var rt = renderSpec[rtname];
        if(rt) deleteRenderTarget(rt);
        renderSpec[rtname] = createRenderTarget(rtw, rth);
    };
    rtfunc('mainRT', renderSpec.width, renderSpec.height);
    rtfunc('wFullRT0', renderSpec.width, renderSpec.height);
    rtfunc('wFullRT1', renderSpec.width, renderSpec.height);
    rtfunc('wHalfRT0', renderSpec.halfWidth, renderSpec.halfHeight);
    rtfunc('wHalfRT1', renderSpec.halfWidth, renderSpec.halfHeight);
}

function render() {
    renderScene();
}

var animating = true;
function toggleAnimation(elm) {
    animating ^= true;
    if(animating) animate();
    if(elm) {
        elm.innerHTML = animating? "Stop":"Start";
    }
}

function stepAnimation() {
    if(!animating) animate();
}

function animate() {
    var curdate = new Date();
    timeInfo.elapsed = (curdate - timeInfo.start) / 1000.0;
    timeInfo.delta = (curdate - timeInfo.prev) / 1000.0;
    timeInfo.prev = curdate;
    
    if(animating) requestAnimationFrame(animate);
    render();
}

function makeCanvasFullScreen(canvas) {
    var b = document.body;
	var d = document.documentElement;
	fullw = Math.max(b.clientWidth , b.scrollWidth, d.scrollWidth, d.clientWidth);
	fullh = Math.max(b.clientHeight , b.scrollHeight, d.scrollHeight, d.clientHeight);
	canvas.width = fullw;
	canvas.height = fullh;
}

//set window.requestAnimationFrame
(function (w, r) {
    w['r'+r] = w['r'+r] || w['webkitR'+r] || w['mozR'+r] || w['msR'+r] || w['oR'+r] || function(c){ w.setTimeout(c, 1000 / 60); };
})(window, 'equestAnimationFrame');

CSS

HTML

<canvas id="sakura"></canvas>
<div class="btnbg">
</div>

<script id="sakura_point_vsh" type="x-shader/x_vertex">
uniform mat4 uProjection;
uniform mat4 uModelview;
uniform vec3 uResolution;
uniform vec3 uOffset;
uniform vec3 uDOF;  //x:focus distance, y:focus radius, z:max radius
uniform vec3 uFade; //x:start distance, y:half distance, z:near fade start

attribute vec3 aPosition;
attribute vec3 aEuler;
attribute vec2 aMisc; //x:size, y:fade

varying vec3 pposition;
varying float psize;
varying float palpha;
varying float pdist;

//varying mat3 rotMat;
varying vec3 normX;
varying vec3 normY;
varying vec3 normZ;
varying vec3 normal;

varying float diffuse;
varying float specular;
varying float rstop;
varying float distancefade;

void main(void) {
    // Projection is based on vertical angle
    vec4 pos = uModelview * vec4(aPosition + uOffset, 1.0);
    gl_Position = uProjection * pos;
    gl_PointSize = aMisc.x * uProjection[1][1] / -pos.z * uResolution.y * 0.5;
    
    pposition = pos.xyz;
    psize = aMisc.x;
    pdist = length(pos.xyz);
    palpha = smoothstep(0.0, 1.0, (pdist - 0.1) / uFade.z);
    
    vec3 elrsn = sin(aEuler);
    vec3 elrcs = cos(aEuler);
    mat3 rotx = mat3(
        1.0, 0.0, 0.0,
        0.0, elrcs.x, elrsn.x,
        0.0, -elrsn.x, elrcs.x
    );
    mat3 roty = mat3(
        elrcs.y, 0.0, -elrsn.y,
        0.0, 1.0, 0.0,
        elrsn.y, 0.0, elrcs.y
    );
    mat3 rotz = mat3(
        elrcs.z, elrsn.z, 0.0, 
        -elrsn.z, elrcs.z, 0.0,
        0.0, 0.0, 1.0
    );
    mat3 rotmat = rotx * roty * rotz;
    normal = rotmat[2];
    
    mat3 trrotm = mat3(
        rotmat[0][0], rotmat[1][0], rotmat[2][0],
        rotmat[0][1], rotmat[1][1], rotmat[2][1],
        rotmat[0][2], rotmat[1][2], rotmat[2][2]
    );
    normX = trrotm[0];
    normY = trrotm[1];
    normZ = trrotm[2];
    
    const vec3 lit = vec3(0.6917144638660746, 0.6917144638660746, -0.20751433915982237);
    
    float tmpdfs = dot(lit, normal);
    if(tmpdfs < 0.0) {
        normal = -normal;
        tmpdfs = dot(lit, normal);
    }
    diffuse = 0.4 + tmpdfs;
    
    vec3 eyev = normalize(-pos.xyz);
    if(dot(eyev, normal) > 0.0) {
        vec3 hv = normalize(eyev + lit);
        specular = pow(max(dot(hv, normal), 0.0), 20.0);
    }
    else {
        specular = 0.0;
    }
    
    rstop = clamp((abs(pdist - uDOF.x) - uDOF.y) / uDOF.z, 0.0, 1.0);
    rstop = pow(rstop, 0.5);
    //-0.69315 = ln(0.5)
    distancefade = min(1.0, exp((uFade.x - pdist) * 0.69315 / uFade.y));
}
</script>
<script id="sakura_point_fsh" type="x-shader/x_fragment">
#ifdef GL_ES
//precision mediump float;
precision highp float;
#endif

uniform vec3 uDOF;  //x:focus distance, y:focus radius, z:max radius
uniform vec3 uFade; //x:start distance, y:half distance, z:near fade start

const vec3 fadeCol = vec3(0.08, 0.03, 0.06);

varying vec3 pposition;
varying float psize;
varying float palpha;
varying float pdist;

//varying mat3 rotMat;
varying vec3 normX;
varying vec3 normY;
varying vec3 normZ;
varying vec3 normal;

varying float diffuse;
varying float specular;
varying float rstop;
varying float distancefade;

float ellipse(vec2 p, vec2 o, vec2 r) {
    vec2 lp = (p - o) / r;
    return length(lp) - 1.0;
}

void main(void) {
    vec3 p = vec3(gl_PointCoord - vec2(0.5, 0.5), 0.0) * 2.0;
    vec3 d = vec3(0.0, 0.0, -1.0);
    float nd = normZ.z; //dot(-normZ, d);
    if(abs(nd) < 0.0001) discard;
    
    float np = dot(normZ, p);
    vec3 tp = p + d * np / nd;
    vec2 coord = vec2(dot(normX, tp), dot(normY, tp));
    
    //angle = 15 degree
    const float flwrsn = 0.258819045102521;
    const float flwrcs = 0.965925826289068;
    mat2 flwrm = mat2(flwrcs, -flwrsn, flwrsn, flwrcs);
    vec2 flwrp = vec2(abs(coord.x), coord.y) * flwrm;
    
    float r;
    if(flwrp.x < 0.0) {
        r = ellipse(flwrp, vec2(0.065, 0.024) * 0.5, vec2(0.36, 0.96) * 0.5);
    }
    else {
        r = ellipse(flwrp, vec2(0.065, 0.024) * 0.5, vec2(0.58, 0.96) * 0.5);
    }
    
    if(r > rstop) discard;
    
    vec3 col = mix(vec3(1.0, 0.8, 0.75), vec3(1.0, 0.9, 0.87), r);
    float grady = mix(0.0, 1.0, pow(coord.y * 0.5 + 0.5, 0.35));
    col *= vec3(1.0, grady, grady);
    col *= mix(0.8, 1.0, pow(abs(coord.x), 0.3));
    col = col * diffuse + specular;
    
    col = mix(fadeCol, col, distancefade);
    
    float alpha = (rstop > 0.001)? (0.5 - r / (rstop * 2.0)) : 1.0;
    alpha = smoothstep(0.0, 1.0, alpha) * palpha;
    
    gl_FragColor = vec4(col * 0.5, alpha);
}
</script>

<script id="fx_common_vsh" type="x-shader/x_vertex">
uniform vec3 uResolution;
attribute vec2 aPosition;