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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 createShader(vtxsrc, frgsrc, uniformlist, attrlist) {
    var vsh = compileShader(gl.VERTEX_SHADER, vtxsrc);
    var fsh = compileShader(gl.FRAGMENT_SHADER, frgsrc);
    
    if(vsh == null || fsh == null) {
        return null;
    }
    
    var prog = gl.createProgram();
    gl.attachShader(prog, vsh);
    gl.attachShader(prog, fsh);
    
    gl.deleteShader(vsh);
    gl.deleteShader(fsh);
    
    gl.linkProgram(prog);
    if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) {
        var errlog = gl.getProgramInfoLog(prog);
        console.error(errlog);
        return null;
    }
    
    if(uniformlist) {
        prog.uniforms = {};
        for(var i = 0; i < uniformlist.length; i++) {
            prog.uniforms[uniformlist[i]] = gl.getUniformLocation(prog, uniformlist[i]);
        }
    }
    
    if(attrlist) {
        prog.attributes = {};
        for(var i = 0; i < attrlist.length; i++) {
            var attr = attrlist[i];
            prog.attributes[attr] = gl.getAttribLocation(prog, attr);
        }
    }
    
    return prog;
}

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;
};

function createPointFlowers() {
    // get point sizes
    var prm = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE);
    renderSpec.pointSize = {'min':prm[0], 'max':prm[1]};
    
    var vtxsrc = document.getElementById("sakura_point_vsh").textContent;
    var frgsrc = document.getElementById("sakura_point_fsh").textContent;
    
    pointFlower.program = createShader(
        vtxsrc, frgsrc,
        ['uProjection', 'uModelview', 'uResolution', 'uOffset', 'uDOF', 'uFade'],
        ['aPosition', 'aEuler', 'aMisc']
    );
    
    useShader(pointFlower.program);
    pointFlower.offset = new Float32Array([0.0, 0.0, 0.0]);
    pointFlower.fader = Vector3.create(0.0, 10.0, 0.0);
    
    // paramerters: velocity[3], rotate[3]
    pointFlower.numFlowers = 1600;
    pointFlower.particles = new Array(pointFlower.numFlowers);
    // vertex attributes {position[3], euler_xyz[3], size[1]}
    pointFlower.dataArray = new Float32Array(pointFlower.numFlowers * (3 + 3 + 2));
    pointFlower.positionArrayOffset = 0;
    pointFlower.eulerArrayOffset = pointFlower.numFlowers * 3;
    pointFlower.miscArrayOffset = pointFlower.numFlowers * 6;
    
    pointFlower.buffer = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, pointFlower.buffer);
    gl.bufferData(gl.ARRAY_BUFFER, pointFlower.dataArray, gl.DYNAMIC_DRAW);
    gl.bindBuffer(gl.ARRAY_BUFFER, null);
    
    unuseShader(pointFlower.program);
    
    for(var i = 0; i < pointFlower.numFlowers; i++) {
        pointFlower.particles[i] = new BlossomParticle();
    }
}

function initPointFlowers() {
    //area
    pointFlower.area = Vector3.create(20.0, 20.0, 20.0);
    pointFlower.area.x = pointFlower.area.y * renderSpec.aspect;
    
    pointFlower.fader.x = 10.0; //env fade start
    pointFlower.fader.y = pointFlower.area.z; //env fade half
    pointFlower.fader.z = 0.1;  //near fade start
    
    //particles
    var PI2 = Math.PI * 2.0;
    var tmpv3 = Vector3.create(0, 0, 0);
    var tmpv = 0;
    var symmetryrand = function() {return (Math.random() * 2.0 - 1.0);};
    for(var i = 0; i < pointFlower.numFlowers; i++) {
        var tmpprtcl = pointFlower.particles[i];
        
        //velocity
        tmpv3.x = symmetryrand() * 0.3 + 0.8;
        tmpv3.y = symmetryrand() * 0.2 - 1.0;
        tmpv3.z = symmetryrand() * 0.3 + 0.5;
        Vector3.normalize(tmpv3);
        tmpv = 2.0 + Math.random() * 1.0;
        tmpprtcl.setVelocity(tmpv3.x * tmpv, tmpv3.y * tmpv, tmpv3.z * tmpv);
        
        //rotation
        tmpprtcl.setRotation(
            symmetryrand() * PI2 * 0.5,
            symmetryrand() * PI2 * 0.5,
            symmetryrand() * PI2 * 0.5
        );
        
        //position
        tmpprtcl.setPosition(
            symmetryrand() * pointFlower.area.x,
            symmetryrand() * pointFlower.area.y,
            symmetryrand() * pointFlower.area.z
        );
        
        //euler
        tmpprtcl.setEulerAngles(
            Math.random() * Math.PI * 2.0,
            Math.random() * Math.PI * 2.0,
            Math.random() * Math.PI * 2.0
        );
        
        //size
        tmpprtcl.setSize(0.9 + Math.random() * 0.1);
    }
}

function renderPointFlowers() {
    //update
    var PI2 = Math.PI * 2.0;
    var limit = [pointFlower.area.x, pointFlower.area.y, pointFlower.area.z];
    var repeatPos = function (prt, cmp, limit) {
        if(Math.abs(prt.position[cmp]) - prt.size * 0.5 > limit) {
            //out of area
            if(prt.position[cmp] > 0) {
                prt.position[cmp] -= limit * 2.0;
            }
            else {
                prt.position[cmp] += limit * 2.0;
            }
        }
    };
    var repeatEuler = function (prt, cmp) {
        prt.euler[cmp] = prt.euler[cmp] % PI2;
        if(prt.euler[cmp] < 0.0) {
            prt.euler[cmp] += PI2;
        }
    };
    
    for(var i = 0; i < pointFlower.numFlowers; i++) {
        var prtcl = pointFlower.particles[i];
        prtcl.update(timeInfo.delta, timeInfo.elapsed);
        repeatPos(prtcl, 0, pointFlower.area.x);
        repeatPos(prtcl, 1, pointFlower.area.y);
        repeatPos(prtcl, 2, pointFlower.area.z);
        repeatEuler(prtcl, 0);
        repeatEuler(prtcl, 1);
        repeatEuler(prtcl, 2);
        
        prtcl.alpha = 1.0;//(pointFlower.area.z - prtcl.position[2]) * 0.5;
        
        prtcl.zkey = (camera.matrix[2] * prtcl.position[0]
                    + camera.matrix[6] * prtcl.position[1]
                    + camera.matrix[10] * prtcl.position[2]
                    + camera.matrix[14]);
    }
    
    // sort
    pointFlower.particles.sort(function(p0, p1){return p0.zkey - p1.zkey;});
    
    // update data
    var ipos = pointFlower.positionArrayOffset;
    var ieuler = pointFlower.eulerArrayOffset;
    var imisc = pointFlower.miscArrayOffset;
    for(var i = 0; i < pointFlower.numFlowers; i++) {
        var prtcl = pointFlower.particles[i];
        pointFlower.dataArray[ipos] = prtcl.position[0];
        pointFlower.dataArray[ipos + 1] = prtcl.position[1];
        pointFlower.dataArray[ipos + 2] = prtcl.position[2];
        ipos += 3;
        pointFlower.dataArray[ieuler] = prtcl.euler[0];
        pointFlower.dataArray[ieuler + 1] = prtcl.euler[1];
        pointFlower.dataArray[ieuler + 2] = prtcl.euler[2];
        ieuler += 3;
        pointFlower.dataArray[imisc] = prtcl.size;
        pointFlower.dataArray[imisc + 1] = prtcl.alpha;
        imisc += 2;
    }
    
    //draw
    gl.enable(gl.BLEND);
    //gl.disable(gl.DEPTH_TEST);
    gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
    
    var prog = pointFlower.program;
    useShader(prog);
    
    gl.uniformMatrix4fv(prog.uniforms.uProjection, false, projection.matrix);
    gl.uniformMatrix4fv(prog.uniforms.uModelview, false, camera.matrix);
    gl.uniform3fv(prog.uniforms.uResolution, renderSpec.array);
    gl.uniform3fv(prog.uniforms.uDOF, Vector3.arrayForm(camera.dof));
    gl.uniform3fv(prog.uniforms.uFade, Vector3.arrayForm(pointFlower.fader));
    
    gl.bindBuffer(gl.ARRAY_BUFFER, pointFlower.buffer);
    gl.bufferData(gl.ARRAY_BUFFER, pointFlower.dataArray, gl.DYNAMIC_DRAW);
    
    gl.vertexAttribPointer(prog.attributes.aPosition, 3, gl.FLOAT, false, 0, pointFlower.positionArrayOffset * Float32Array.BYTES_PER_ELEMENT);
    gl.vertexAttribPointer(prog.attributes.aEuler, 3, gl.FLOAT, false, 0, pointFlower.eulerArrayOffset * Float32Array.BYTES_PER_ELEMENT);
    gl.vertexAttribPointer(prog.attributes.aMisc, 2, gl.FLOAT, false, 0, pointFlower.miscArrayOffset * Float32Array.BYTES_PER_ELEMENT);
    
    // doubler
    for(var i = 1; i < 2; i++) {
        var zpos = i * -2.0;
        pointFlower.offset[0] = pointFlower.area.x * -1.0;
        pointFlower.offset[1] = pointFlower.area.y * -1.0;
        pointFlower.offset[2] = pointFlower.area.z * zpos;
        gl.uniform3fv(prog.uniforms.uOffset, pointFlower.offset);
        gl.drawArrays(gl.POINT, 0, pointFlower.numFlowers);
        
        pointFlower.offset[0] = pointFlower.area.x * -1.0;
        pointFlower.offset[1] = pointFlower.area.y *  1.0;
        pointFlower.offset[2] = pointFlower.area.z * zpos;
        gl.uniform3fv(prog.uniforms.uOffset, pointFlower.offset);
        gl.drawArrays(gl.POINT, 0, pointFlower.numFlowers);
        
        pointFlower.offset[0] = pointFlower.area.x *  1.0;
        pointFlower.offset[1] = pointFlower.area.y * -1.0;
        pointFlower.offset[2] = pointFlower.area.z * zpos;
        gl.uniform3fv(prog.uniforms.uOffset, pointFlower.offset);
        gl.drawArrays(gl.POINT, 0, pointFlower.numFlowers);
        
        pointFlower.offset[0] = pointFlower.area.x *  1.0;
        pointFlower.offset[1] = pointFlower.area.y *  1.0;
        pointFlower.offset[2] = pointFlower.area.z * zpos;
        gl.uniform3fv(prog.uniforms.uOffset, pointFlower.offset);
        gl.drawArrays(gl.POINT, 0, pointFlower.numFlowers);
    }
    
    //main
    pointFlower.offset[0] = 0.0;
    pointFlower.offset[1] = 0.0;
    pointFlower.offset[2] = 0.0;
    gl.uniform3fv(prog.uniforms.uOffset, pointFlower.offset);
    gl.drawArrays(gl.POINT, 0, pointFlower.numFlowers);
    
    gl.bindBuffer(gl.ARRAY_BUFFER, null);
    unuseShader(prog);
    
    gl.enable(gl.DEPTH_TEST);
    gl.disable(gl.BLEND);
}

// 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");
}

function renderPostProcess() {
    gl.enable(gl.TEXTURE_2D);
    gl.disable(gl.DEPTH_TEST);
    var bindRT = function (rt, isclear) {
        gl.bindFramebuffer(gl.FRAMEBUFFER, rt.frameBuffer);
        gl.viewport(0, 0, rt.width, rt.height);
        if(isclear) {
            gl.clearColor(0, 0, 0, 0);
            gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
        }
    };
    
    //make bright buff
    bindRT(renderSpec.wHalfRT0, true);
    useEffect(effectLib.mkBrightBuf, renderSpec.mainRT);
    drawEffect(effectLib.mkBrightBuf);
    unuseEffect(effectLib.mkBrightBuf);
    
    // make bloom
    for(var i = 0; i < 2; i++) {
        var p = 1.5 + 1 * i;
        var s = 2.0 + 1 * i;
        bindRT(renderSpec.wHalfRT1, true);
        useEffect(effectLib.dirBlur, renderSpec.wHalfRT0);
        gl.uniform4f(effectLib.dirBlur.program.uniforms.uBlurDir, p, 0.0, s, 0.0);
        drawEffect(effectLib.dirBlur);
        unuseEffect(effectLib.dirBlur);
        
        bindRT(renderSpec.wHalfRT0, true);
        useEffect(effectLib.dirBlur, renderSpec.wHalfRT1);
        gl.uniform4f(effectLib.dirBlur.program.uniforms.uBlurDir, 0.0, p, 0.0, s);
        drawEffect(effectLib.dirBlur);
        unuseEffect(effectLib.dirBlur);
    }
    
    //display
    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
    gl.viewport(0, 0, renderSpec.width, renderSpec.height);
    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
    
    useEffect(effectLib.finalComp, renderSpec.mainRT);
    gl.uniform1i(effectLib.finalComp.program.uniforms.uBloom, 1);
    gl.activeTexture(gl.TEXTURE1);
    gl.bindTexture(gl.TEXTURE_2D, renderSpec.wHalfRT0.texture);
    drawEffect(effectLib.finalComp);
    unuseEffect(effectLib.finalComp);
    
    gl.enable(gl.DEPTH_TEST);
}

/////
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;
}

window.addEventListener('load', function(e) {
    var canvas = document.getElementById("sakura");
    try {
        makeCanvasFullScreen(canvas);
        gl = canvas.getContext('experimental-webgl');
    } catch(e) {
        alert("WebGL not supported." + e);
        console.error(e);
        return;
    }
    
    window.addEventListener('resize', onResize);
    
    setViewports();
    createScene();
    initScene();
    
    timeInfo.start = new Date();
    timeInfo.prev = timeInfo.start;
    animate();
});

//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, 'requestAnimationFrame');
<canvas id="sakura"></canvas>
<div class="btnbg">
<button type="button" onclick="toggleAnimation(this)">Stop</button>
</div>

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

varying vec2 texCoord;
varying vec2 screenCoord;

void main(void) {
    gl_Position = vec4(aPosition, 0.0, 1.0);
    texCoord = aPosition.xy * 0.5 + vec2(0.5, 0.5);
    screenCoord = aPosition.xy * vec2(uResolution.z, 1.0);
}
</script>
<script id="bg_fsh" type="x-shader/x_fragment">
#ifdef GL_ES
//precision mediump float;
precision highp float;
#endif

uniform vec2 uTimes;

varying vec2 texCoord;
varying vec2 screenCoord;

void main(void) {
    vec3 col;
    float c;
    vec2 tmpv = texCoord * vec2(0.8, 1.0) - vec2(0.95, 1.0);
    c = exp(-pow(length(tmpv) * 1.8, 2.0));
    col = mix(vec3(0.02, 0.0, 0.03), vec3(0.96, 0.98, 1.0) * 1.5, c);
    gl_FragColor = vec4(col * 0.5, 1.0);
}
</script>
<script id="fx_brightbuf_fsh" type="x-shader/x_fragment">
#ifdef GL_ES
//precision mediump float;
precision highp float;
#endif
uniform sampler2D uSrc;
uniform vec2 uDelta;

varying vec2 texCoord;
varying vec2 screenCoord;

void main(void) {
    vec4 col = texture2D(uSrc, texCoord);
    gl_FragColor = vec4(col.rgb * 2.0 - vec3(0.5), 1.0);
}
</script>
<script id="fx_dirblur_r4_fsh" type="x-shader/x_fragment">
#ifdef GL_ES
//precision mediump float;
precision highp float;
#endif
uniform sampler2D uSrc;
uniform vec2 uDelta;
uniform vec4 uBlurDir; //dir(x, y), stride(z, w)

varying vec2 texCoord;
varying vec2 screenCoord;

void main(void) {
    vec4 col = texture2D(uSrc, texCoord);
    col = col + texture2D(uSrc, texCoord + uBlurDir.xy * uDelta);
    col = col + texture2D(uSrc, texCoord - uBlurDir.xy * uDelta);
    col = col + texture2D(uSrc, texCoord + (uBlurDir.xy + uBlurDir.zw) * uDelta);
    col = col + texture2D(uSrc, texCoord - (uBlurDir.xy + uBlurDir.zw) * uDelta);
    gl_FragColor = col / 5.0;
}
</script>
<!-- effect fragment shader template -->
<script id="fx_common_fsh" type="x-shader/x_fragment">
#ifdef GL_ES
//precision mediump float;
precision highp float;
#endif
uniform sampler2D uSrc;
uniform vec2 uDelta;

varying vec2 texCoord;
varying vec2 screenCoord;

void main(void) {
    gl_FragColor = texture2D(uSrc, texCoord);
}
</script>
<!-- post processing -->
<script id="pp_final_vsh" type="x-shader/x_vertex">
uniform vec3 uResolution;
attribute vec2 aPosition;
varying vec2 texCoord;
varying vec2 screenCoord;
void main(void) {
    gl_Position = vec4(aPosition, 0.0, 1.0);
    texCoord = aPosition.xy * 0.5 + vec2(0.5, 0.5);
    screenCoord = aPosition.xy * vec2(uResolution.z, 1.0);
}
</script>
<script id="pp_final_fsh" type="x-shader/x_fragment">
#ifdef GL_ES
//precision mediump float;
precision highp float;
#endif
uniform sampler2D uSrc;
uniform sampler2D uBloom;
uniform vec2 uDelta;
varying vec2 texCoord;
varying vec2 screenCoord;
void main(void) {
    vec4 srccol = texture2D(uSrc, texCoord) * 2.0;
    vec4 bloomcol = texture2D(uBloom, texCoord);
    vec4 col;
    col = srccol + bloomcol * (vec4(1.0) + srccol);
    col *= smoothstep(1.0, 0.0, pow(length((texCoord - vec2(0.5)) * 2.0), 1.2) * 0.5);
    col = pow(col, vec4(0.45454545454545)); //(1.0 / 2.2)
    
    gl_FragColor = vec4(col.rgb, 1.0);
    gl_FragColor.a = 1.0;
}
</script>
/*Sakura animation using WebGL. No images are used. The framerate might be slow or the demo might not play at all in some older systems so you can watch this video: http://www.screenr.com/BFZ8. Let me make it clear that I did not make this and just thought is was very cool and wanted to share it.
*/

body {
    padding:0;
    margin:0;
    overflow:hidden;
	  height: 600px;
}
canvas {
    padding:0;
    margin:0;
}
div.btnbg {
    position:fixed;
    left:0;
    top:0;
    box-shadow: 0px 0px 15px #ccc;
}
div.btnbg:hover{
    text-shadow: 0px 0px 3px #ccc;
    box-shadow: 0px 0px 20px #ccc;
}