WebGLSamples.github.io/persistence/persistence.html at master · ProGamerCode/WebGLSamples.github.io

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<!--

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions are

* met:

* * Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* * Redistributions in binary form must reproduce the above

* copyright notice, this list of conditions and the following disclaimer

* in the documentation and/or other materials provided with the

* distribution.

* * Neither the name of Google Inc. nor the names of its

* contributors may be used to endorse or promote products derived from

* this software without specific prior written permission.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-->

<!doctype html>

<html>

<head>

<title>WebGL Persistence</title>

<style>

html, body {

width: 100%;

height: 100%;

border: 0px;

padding: 0px;

margin: 0px;

background-color: dark-red;

font-family: sans-serif;

overflow: hidden;

color: #000;

}

a {

color: #000;

}

#info {

font-size: small;

position: absolute;

top: 0px; width: 100%;

padding: 5px;

text-align: center;

z-index: 2;

}

CANVAS {

background-color: gray;

}

#advanced {

color: gray;

}

#uiContainer {

position: absolute;

top: 10px;

left: 20px;

width: 250px;

z-index: 2;

color: white;

background-color: rgba(0,0,0,0.5);

border-radius: 10px;

padding: 10px;

font-size: small;

}

.clickable {

cursor: pointer;

}

#applyorig {

color: #444;

}

#viewContainer {

width: 100%;

height: 100%;

}

img {

border: solid black 2px;

}

</style>

tdl.require('tdl.buffers');

tdl.require('tdl.fast');

tdl.require('tdl.framebuffers');

tdl.require('tdl.log');

tdl.require('tdl.math');

tdl.require('tdl.models');

tdl.require('tdl.particles');

tdl.require('tdl.primitives');

tdl.require('tdl.programs');

tdl.require('tdl.textures');

tdl.require('tdl.webgl');

// globals

var gl; // the gl context.

var canvas; // the canvas

var math; // the math lib.

var fast; // the fast math lib.

var g_logGLCalls = true; // whether or not to log webgl calls

var g_debug = false; // whether or not to debug.

var g_drawOnce = false; // draw just one frame.

var g_setCountElements = [];

var g_autoSet = true;

var g_autoSetting = 0;

var g_mixTimer = 0;

var g_mixAmount = 0;

var g_eyeClock = 0;

var g_compositeLastFrame = false;

var g_mixDuration = 1;

var g_targetHeight = 0.0;

var g_targetRadius = 1;

var g_eyeHeight = 10;

var g_eyeRadius = 20;

var g_ui = [

{ obj: 'globals', name: 'persistence', value: 0.5, max: 1 },

{ obj: 'globals', name: 'texOffsetX', value: 0, max: 0.1, min: -0.1 },

{ obj: 'globals', name: 'texOffsetY', value: 0, max: 0.1, min: -0.1 },

{ obj: 'globals', name: 'texMultX', value: 1, max: 1.2, min: 0.8 },

{ obj: 'globals', name: 'texMultY', value: 1, max: 1.2, min: 0.8 },

{ obj: 'globals', name: 'texRotation', value: 0, max: 20, min: -20 },

{ obj: 'globals', name: 'eyeSpeed', value: 0, max: 3 },

];

var g = {

globals: {}

};

//g_drawOnce = true;

//g_debug = true;

function ValidateNoneOfTheArgsAreUndefined(functionName, args) {

for (var ii = 0; ii < args.length; ++ii) {

if (args[ii] === undefined) {

tdl.error("undefined passed to gl." + functionName + "(" +

tdl.webgl.glFunctionArgsToString(functionName, args) + ")");

}

function Log(msg) {

if (g_logGLCalls) {

tdl.log(msg);

}

function LogGLCall(functionName, args) {

if (g_logGLCalls) {

ValidateNoneOfTheArgsAreUndefined(functionName, args)

tdl.log("gl." + functionName + "(" +

tdl.webgl.glFunctionArgsToString(functionName, args) + ")");

}

function setupCube() {

var textures = {

diffuseSampler: tdl.textures.loadTexture("../google-io/2011/assets/google.png")

};

var program = tdl.programs.loadProgramFromScriptTags(

'pointLightVertexShader',

'pointLightFragmentShader');

var arrays = tdl.primitives.createCube(1);

return new tdl.models.Model(program, arrays, textures);

}

function makePersist(newTexture, oldTexture) {

var textures = {

newRender: newTexture,

oldRender: oldTexture

};

var program = tdl.programs.loadProgramFromScriptTags(

'persistVertexShader',

'persistFragmentShader');

var arrays = tdl.primitives.createPlane(2, 2, 1, 1);

tdl.primitives.reorient(arrays,

[1, 0, 0, 0,

0, 0,-1, 0,

0, 1, 0, 0,

0, 0, 0, 1]);

delete arrays.normal;

return new tdl.models.Model(program, arrays, textures);

}

function makeLastPlane(texture) {

var textures = {

texture: texture

};

var program = tdl.programs.loadProgramFromScriptTags(

'mainVertexShader',

'mainFragmentShader');

var arrays = tdl.primitives.createPlane(2, 2, 1, 1);

tdl.primitives.reorient(arrays,

[1, 0, 0, 0,

0, 0,-1, 0,

0, 1, 0, 0,

0, 0, 0, 1]);

delete arrays.normal;

return new tdl.models.Model(program, arrays, textures);

}

function initialize() {

math = tdl.math;

fast = tdl.fast;

canvas = document.getElementById("canvas");

m4 = fast.matrix4;

gl = tdl.webgl.setupWebGL(canvas);

if (!gl) {

return false;

}

if (g_debug) {

gl = tdl.webgl.makeDebugContext(gl, undefined, LogGLCall);

}

var mainFBO = tdl.framebuffers.createFramebuffer(canvas.width, canvas.height, true);

var persistentFBO1 = tdl.framebuffers.createFramebuffer(

canvas.width, canvas.height);

var persistentFBO2 = tdl.framebuffers.createFramebuffer(

canvas.width, canvas.height);

var persistPlane = makePersist(

mainFBO.texture, persistentFBO1.texture);

var lastPlane = makeLastPlane(persistentFBO2.texture);

var model = setupCube();

var projection = new Float32Array(16);

var view = new Float32Array(16);

var identity = new Float32Array([1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]);

var world = new Float32Array(16);

var worldInverse = new Float32Array(16);

var worldInverseTranspose = new Float32Array(16);

var viewProjection = new Float32Array(16);

var worldViewProjection = new Float32Array(16);

var viewInverse = new Float32Array(16);

var viewDirectionProjectionInverse = new Float32Array(16);

var eyePosition = new Float32Array(3);

var target = new Float32Array(3);

var up = new Float32Array([0,1,0]);

var lightWorldPos = new Float32Array(3);

var v3t0 = new Float32Array(3);

var v3t1 = new Float32Array(3);

var v3t2 = new Float32Array(3);

var v3t3 = new Float32Array(3);

var m4t0 = new Float32Array(16);

var m4t1 = new Float32Array(16);

var m4t2 = new Float32Array(16);

var m4t3 = new Float32Array(16);

var zero4 = new Float32Array(4);

var one4 = new Float32Array([1,1,1,1]);

// uniforms.

var modelConst = {

viewInverse: viewInverse,

lightWorldPos: lightWorldPos,

specular: one4,

shininess: 50,

specularFactor: 0.2,

};

var modelPer = {

colorMult: new Float32Array([0,0,0,1]),

world: world,

worldViewProjection: worldViewProjection,

worldInverse: worldInverse,

worldInverseTranspose: worldInverseTranspose

};

var rtPlanePer = {

worldViewProjection: worldViewProjection

};

var frameCount = 0;

var then = (new Date()).getTime() * 0.001;

var clock = 0.0;

function render() {

++frameCount;

if (!g_drawOnce) {

tdl.webgl.requestAnimationFrame(render, canvas);

}

var now = (new Date()).getTime() * 0.001;

var elapsedTime = now - then;

then = now;

clock += elapsedTime;

g_eyeClock += elapsedTime * g.globals.eyeSpeed;

eyePosition[0] = Math.sin(g_eyeClock) * g_eyeRadius;

eyePosition[1] = g_eyeHeight;

eyePosition[2] = Math.cos(g_eyeClock) * g_eyeRadius;

target[0] = Math.sin(g_eyeClock + Math.PI) * g_targetRadius;

target[1] = g_targetHeight;

target[2] = Math.cos(g_eyeClock + Math.PI) * g_targetRadius;

// Draw to main fbo.

mainFBO.bind();

gl.colorMask(true, true, true, true);

gl.depthMask(true);

gl.clearColor(1,1,1,0);

gl.clearDepth(1);

gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);

gl.enable(gl.DEPTH_TEST);

m4.perspective(

projection,

math.degToRad(30),

canvas.clientWidth / canvas.clientHeight,

5000);

m4.lookAt(

view,

eyePosition,

target,

up);

m4.mul(viewProjection, view, projection);

// Put the light near the camera

m4.getAxis(v3t0, viewInverse, 0); // x

m4.getAxis(v3t1, viewInverse, 1); // y

m4.getAxis(v3t2, viewInverse, 2); // z

fast.mulScalarVector(v3t0, 10, v3t0);

fast.mulScalarVector(v3t1, 10, v3t1);

fast.mulScalarVector(v3t2, 10, v3t2);

fast.addVector(lightWorldPos, eyePosition, v3t0);

fast.addVector(lightWorldPos, lightWorldPos, v3t1);

fast.addVector(lightWorldPos, lightWorldPos, v3t2);

Log("--Draw models---------------------------------------");

model.drawPrep(modelConst);

math.resetPseudoRandom();

var rand = math.pseudoRandom;

for (var ii = 0; ii < 100; ++ii) {

var xClock = clock * (rand() + 0.5) + rand() * Math.PI * 2;

var yClock = clock * (rand() + 0.5) + rand() * Math.PI * 2;

var zClock = clock * (rand() + 0.5) + rand() * Math.PI * 2;

var x = Math.sin(xClock) * rand() * 5;

var y = Math.sin(yClock) * rand() * 5;

var z = Math.cos(zClock) * rand() * 5;

m4.translation(world, [x, y, z]);

m4.mul(worldViewProjection, world, viewProjection);

m4.inverse(worldInverse, world);

m4.transpose(worldInverseTranspose, worldInverse);

modelPer.colorMult = g_glColors[Math.floor(rand() * g_glColors.length)];

model.draw(modelPer);

}

if (g_mixTimer > 0) {

g_mixTimer = Math.max(0, g_mixTimer - elapsedTime);

g_mixAmount = g_mixTimer / g_mixDuration;

}

mainFBO.unbind();

gl.disable(gl.DEPTH_TEST);

gl.disable(gl.BLEND);

// blend base with persist1 into persist2

persistentFBO2.bind();

persistPlane.drawPrep({persistence: g.globals.persistence});

var fixMatrix = [

1, 0, 0,

0, 1, 0,

-0.5, -0.5, 1

];

var fixInverseMatrix = [

1, 0, 0,

0, 1, 0,

0.5, 0.5, 1

];

var scaleMatrix = [

g.globals.texMultX, 0, 0,

0, g.globals.texMultY, 0,

0, 0, 1,

];

var c = Math.cos(math.degToRad(g.globals.texRotation));

var s = Math.sin(math.degToRad(g.globals.texRotation));

var rotationMatrix = [

c, s, 0,

-s, c, 0,

0, 0, 1

];

var translationMatrix = [

1, 0, 0,

0, 1, 0,

g.globals.texOffsetX, g.globals.texOffsetY, 1

];

var t;

//t = math.mulMatrixMatrix3(translationMatrix, fixInverseMatrix);

t = math.copyMatrix(translationMatrix);

t = math.mulMatrixMatrix3(fixInverseMatrix, t);

t = math.mulMatrixMatrix3(rotationMatrix, t);

t = math.mulMatrixMatrix3(scaleMatrix, t);

t = math.mulMatrixMatrix3(fixMatrix, t);

persistPlane.draw({

oldRender: persistentFBO1.texture,

texMatrix: t

});

persistentFBO2.unbind();

// draw on the backbuffer.

gl.colorMask(true, true, true, true);

gl.clearColor(0,0,0,1);

gl.clearDepth(1);

gl.depthMask(true); // Bug in Chrome?

gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);

lastPlane.drawPrep();

lastPlane.draw({texture: persistentFBO2.texture});

if (g_compositeLastFrame) {

gl.enable(gl.BLEND);

gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);

lastPlane.draw({texture: mainFBO.texture});

}

// swap persist FBOs.

var temp = persistentFBO1;

persistentFBO1 = persistentFBO2;

persistentFBO2 = temp;

// turn off logging after 1 frame.

g_logGLCalls = false;

}

render();

return true;

}

function getParamId(id) {

return id.substr(6).replace(/(\w)/, function(m) {return m.toLowerCase() });

}

function setParam(event, jui, ui, obj, valueElem) {

var id = event.target.id;

var value = getRealValueFromUIValue(ui, jui.value);

valueElem.innerHTML = value.toFixed(3);

obj[id] = value;

}

function getRealValueFromUIValue(ui, uiValue) {

var realMin = ui.min || 0;

var realMax = ui.max;

var realRange = realMax - realMin;

var realValue = realMin + (uiValue / 1000) * realRange;

return realValue;

}

function getUIValueFromRealValue(ui, realValue) {

var realMin = ui.min || 0;

var realMax = ui.max;

var realRange = realMax - realMin;

var uiValue = (realValue - realMin) / realRange * 1000;

return uiValue;

}

function setupSlider($, elem, ui, obj) {

var textDiv = document.createElement('div');

var labelDiv = document.createElement('span');

labelDiv.appendChild(document.createTextNode(ui.name));

var valueDiv = document.createElement('span');

valueDiv.appendChild(document.createTextNode(ui.value));

valueDiv.style.position = "absolute";

valueDiv.style.right = "10px";

var sliderDiv = document.createElement('div');

sliderDiv.id = ui.name;

textDiv.appendChild(labelDiv);

textDiv.appendChild(valueDiv);

elem.appendChild(textDiv);

elem.appendChild(sliderDiv);

$(sliderDiv).slider({

range: false,

step: 1,

max: 1000,

value: getUIValueFromRealValue(ui, obj[ui.name]),

slide: function(event, jui) { setParam(event, jui, ui, obj, valueDiv); }

});

}

function toggleApplyOriginal() {

g_compositeLastFrame = !g_compositeLastFrame;

document.getElementById("applyorig").style.color = g_compositeLastFrame ? "red" : "#444";

}

$(function(){

var uiElem = document.getElementById('adjustments');

for (var ii = 0; ii < g_ui.length; ++ii) {

var ui = g_ui[ii];

var obj = g[ui.obj];

obj[ui.name] = ui.value;

var div = document.createElement('div');

setupSlider($, div, ui, obj);

uiElem.appendChild(div);

}

$("#applyorig").click(function() { toggleApplyOriginal(); });

initialize();

});

</script>

</head>

<body>

<div><a href="http://threedlibrary.googlecode.com" target="_blank">tdl.js</a> - persistence</div>

<div><a href="http://www.youtube.com/watch?v=rfQ8rKGTVlg#t=31m42s">click here to see how it works</div>

</div>

<div>Settings</div>

</div>

<hr/>

<input type="checkbox" id="applyorig">Apply Original Image</input>

</div>

</div>

</video>

</div>

</body>

uniform mat4 worldViewProjection;

attribute vec4 position;

attribute vec2 texCoord;

varying vec2 v_texCoord;

void main() {

gl_Position = worldViewProjection * position;

v_texCoord = texCoord;

}

</script>

#ifdef GL_ES

precision mediump float;

#endif

uniform sampler2D texture;

varying vec2 v_texCoord;

void main() {

gl_FragColor = texture2D(texture, v_texCoord);

}

</script>

attribute vec2 position;

attribute vec2 texCoord;

varying vec2 v_texCoord;

void main() {

gl_Position = vec4(position, 0, 1);

v_texCoord = texCoord;

}

</script>

#ifdef GL_ES

precision mediump float;

#endif

uniform sampler2D newRender;

uniform sampler2D oldRender;

uniform float persistence;

uniform mat3 texMatrix;

varying vec2 v_texCoord;

void main() {

vec4 newColor = texture2D(newRender, v_texCoord);

vec4 oldColor = texture2D(oldRender, (texMatrix * vec3(v_texCoord, 1)).xy);

gl_FragColor = mix(newColor, oldColor, persistence);

}

</script>

attribute vec2 position;

attribute vec2 texCoord;

varying vec2 v_texCoord;

void main() {

gl_Position = vec4(position, 0, 1);

v_texCoord = texCoord;

}

</script>

#ifdef GL_ES

precision mediump float;

#endif

uniform sampler2D texture;

varying vec2 v_texCoord;

void main() {

vec4 color = texture2D(texture, v_texCoord);

gl_FragColor = color;

}

</script>

uniform mat4 worldViewProjection;

uniform vec3 lightWorldPos;

uniform mat4 world;

uniform mat4 viewInverse;

uniform mat4 worldInverseTranspose;

attribute vec4 position;

attribute vec3 normal;

attribute vec2 texCoord;

varying vec4 v_position;

varying vec2 v_texCoord;

varying vec3 v_normal;

varying vec3 v_surfaceToLight;

varying vec3 v_surfaceToView;

void main() {

v_texCoord = texCoord;

v_position = (worldViewProjection * position);

v_normal = (worldInverseTranspose * vec4(normal, 0)).xyz;

v_surfaceToLight = lightWorldPos - (world * position).xyz;

v_surfaceToView = (viewInverse[3] - (world * position)).xyz;

gl_Position = v_position;

}

</script>

#ifdef GL_ES

precision mediump float;

#endif

uniform vec4 colorMult;

varying vec4 v_position;

varying vec2 v_texCoord;

varying vec3 v_normal;

varying vec3 v_surfaceToLight;

varying vec3 v_surfaceToView;

uniform sampler2D diffuseSampler;

uniform vec4 specular;

uniform sampler2D bumpSampler;

uniform float shininess;

uniform float specularFactor;

vec4 lit(float l ,float h, float m) {

return vec4(1.0,

max(l, 0.0),

(l > 0.0) ? pow(max(0.0, h), m) : 0.0,

1.0);

}

void main() {

vec4 diffuse = texture2D(diffuseSampler, v_texCoord) * colorMult;

vec3 normal = normalize(v_normal);

vec3 surfaceToLight = normalize(v_surfaceToLight);

vec3 surfaceToView = normalize(v_surfaceToView);

vec3 halfVector = normalize(surfaceToLight + surfaceToView);

vec4 litR = lit(dot(normal, surfaceToLight),

dot(normal, halfVector), shininess);

gl_FragColor = vec4((

vec4(1,1,1,1) * (diffuse * litR.y

+ specular * litR.z * specularFactor)).rgb,

diffuse.a);

}

</script>

</html>

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