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<html>
<head>
<title>Learning WebGL — lesson 11</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
<script type="text/javascript" src="webgl-utils.js"></script>
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
varying vec2 vTextureCoord;
varying vec3 vLightWeighting;
uniform sampler2D uSampler;
void main(void) {
vec4 textureColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));
gl_FragColor = vec4(textureColor.rgb * vLightWeighting, textureColor.a);
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
attribute vec3 aVertexNormal;
attribute vec2 aTextureCoord;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
uniform mat3 uNMatrix;
uniform vec3 uAmbientColor;
uniform vec3 uLightingDirection;
uniform vec3 uDirectionalColor;
uniform bool uUseLighting;
varying vec2 vTextureCoord;
varying vec3 vLightWeighting;
void main(void) {
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
vTextureCoord = aTextureCoord;
if (!uUseLighting) {
vLightWeighting = vec3(1.0, 1.0, 1.0);
} else {
vec3 transformedNormal = uNMatrix * aVertexNormal;
float directionalLightWeighting = max(dot(transformedNormal, uLightingDirection), 0.0);
vLightWeighting = uAmbientColor + uDirectionalColor * directionalLightWeighting;
}
}
</script>
</head>
<body onload="webGLStart();">
<style>
#video {
display: none;
}
#video-360 {
width: 1280px;
height: 720px;
display: block;
position: relative;
}
#c {
cursor: pointer;
}
#video-360:hover #controls {
opacity: 1;
}
#controls {
opacity: 0;
bottom: 0;
height: 50px;
width: 100%;
background: linear-gradient(0deg, rgba(0,0,0,0.2), transparent);
position: absolute;
transition: opacity 0.3s;
}
#controls-holder {
margin: 0 13px;
height: 100%;
position: relative;
}
#play-button {
cursor: pointer;
display: block;
top: 13px;
left: 13px;
width: 26px;
height: 26px;
position: absolute;
}
#play-icon {
transition: all 0.3s;
position: absolute;
width: 0;
height: 0;
border-top: 12px solid transparent;
border-bottom: 12px solid transparent;
border-left: 20px solid white;
}
#play-icon::before {
opacity: 0;
content: "";
position: absolute;
display: block;
background: white;
width: 8px;
height: 24px;
top: -12px;
left: 5px;
transition: opacity 0.3s;
}
.pause > #play-icon {
border-top: 12px solid white;
border-bottom: 12px solid white;
border-left: 8px solid white;
}
.pause > #play-icon::before {
opacity: 1;
}
#seeker-back {
cursor: pointer;
top: 0;
position: absolute;
height: 5px;
background: white;
width: 100%;
transition: height 0.3s, top 0.3s;
overflow:hidden;
}
#seeker-back:hover {
height: 11px;
top: -4px;
}
#seeker {
height: 100%;
width: 0px;
background: red;
transition: width 0.3s;
}
#fullscreen-button {
cursor: pointer;
top: 13px;
right: 13px;
position: absolute;
height: 20px;
width: 20px;
border: 2px dashed white;
}
#fullscreen-button:hover {
border: 2px solid white;
}
#sound-button {
cursor: pointer;
top: 13px;
right: 63px;
position: absolute;
width: 0;
height: 0;
border-top: 12px solid transparent;
border-bottom: 12px solid transparent;
border-right: 18px solid white;
border-radius: 3px;
}
.mute::after {
opacity: 0;
}
#sound-button::before {
content: "";
position: absolute;
display: block;
background: white;
width: 10px;
height: 13px;
top: -6px;
left: 0px;
border-radius: 5px 0 0 5px;
}
#sound-button::after {
content: "";
position: absolute;
display: block;
width: 12px;
height: 16px;
border-radius: 100%;
top: -8px;
left: 14px;
border-style: none double none none;
border-color: white;
border-width: 4px;
transition: opacity 0.3s;
}
</style>
<div id="video-360">
<canvas id="c" style="border: none;" width="1280" height="720"></canvas>
<video id="video" controls></video>
<div id="controls">
<div id="controls-holder">
<div id="play-button">
<div id="play-icon"></div>
</div>
<div id="fullscreen-button"></div>
<div id="sound-button"></div>
<div id="seeker-back">
<div id="seeker"></div>
</div>
</div>
</div>
</div>
<br/>
<script type="text/javascript">
var gl;
function initGL(canvas) {
try {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
} catch (e) {
}
if (!gl) {
alert("Could not initialise WebGL, sorry :-(");
}
}
function getShader(gl, id) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
var shaderProgram;
function initShaders() {
var fragmentShader = getShader(gl, "shader-fs");
var vertexShader = getShader(gl, "shader-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);
shaderProgram.vertexNormalAttribute = gl.getAttribLocation(shaderProgram, "aVertexNormal");
gl.enableVertexAttribArray(shaderProgram.vertexNormalAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.nMatrixUniform = gl.getUniformLocation(shaderProgram, "uNMatrix");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
shaderProgram.useLightingUniform = gl.getUniformLocation(shaderProgram, "uUseLighting");
shaderProgram.ambientColorUniform = gl.getUniformLocation(shaderProgram, "uAmbientColor");
shaderProgram.lightingDirectionUniform = gl.getUniformLocation(shaderProgram, "uLightingDirection");
shaderProgram.directionalColorUniform = gl.getUniformLocation(shaderProgram, "uDirectionalColor");
}
function handleLoadedTexture(texture) {
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.image);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
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.generateMipmap(gl.TEXTURE_2D);
}
var moonTexture;
function initTexture() {
moonTexture = gl.createTexture();
moonTexture.image = document.getElementById('video');
moonTexture.image.play();
handleLoadedTexture(moonTexture);
}
var mvMatrix = mat4.create();
var mvMatrixStack = [];
var pMatrix = mat4.create();
function mvPushMatrix() {
var copy = mat4.create();
mat4.set(mvMatrix, copy);
mvMatrixStack.push(copy);
}
function mvPopMatrix() {
if (mvMatrixStack.length == 0) {
throw "Invalid popMatrix!";
}
mvMatrix = mvMatrixStack.pop();
}
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
var normalMatrix = mat3.create();
mat4.toInverseMat3(mvMatrix, normalMatrix);
mat3.transpose(normalMatrix);
gl.uniformMatrix3fv(shaderProgram.nMatrixUniform, false, normalMatrix);
}
function degToRad(degrees) {
return degrees * Math.PI / 180;
}
var mouseDown = false;
var lastMouseX = null;
var lastMouseY = null;
var newX = null;
var newY = null;
var speedX = null;
var speedY = null;
var camRotX = 0; //in rad
var camRotY = 0; //in rad
var moonRotationMatrix = mat4.create();
mat4.identity(moonRotationMatrix);
function handleMouseDown(event) {
mouseDown = true;
lastMouseX = event.clientX;
lastMouseY = event.clientY;
}
function handleMouseUp(event) {
mouseDown = false;
}
function handleMouseMove(event) {
newX = event.clientX;
newY = event.clientY;
}
var moonVertexPositionBuffer;
var moonVertexNormalBuffer;
var moonVertexTextureCoordBuffer;
var moonVertexIndexBuffer;
function initBuffers() {
var latitudeBands = 50;
var longitudeBands = 50;
var radius = 1;
var vertexPositionData = [];
var normalData = [];
var textureCoordData = [];
for (var latNumber=0; latNumber <= latitudeBands; latNumber++) {
var theta = latNumber * Math.PI / latitudeBands;
var sinTheta = Math.sin(theta);
var cosTheta = Math.cos(theta);
for (var longNumber=0; longNumber <= longitudeBands; longNumber++) {
var phi = longNumber * 2 * Math.PI / longitudeBands;
var sinPhi = Math.sin(phi);
var cosPhi = Math.cos(phi);
var x = cosPhi * sinTheta;
var y = cosTheta;
var z = sinPhi * sinTheta;
var u = (longNumber / longitudeBands);
var v = (latNumber / latitudeBands);
normalData.push(x);
normalData.push(y);
normalData.push(z);
textureCoordData.push(u);
textureCoordData.push(v);
vertexPositionData.push(radius * x);
vertexPositionData.push(radius * y);
vertexPositionData.push(radius * z);
}
}
var indexData = [];
for (var latNumber=0; latNumber < latitudeBands; latNumber++) {
for (var longNumber=0; longNumber < longitudeBands; longNumber++) {
var first = (latNumber * (longitudeBands + 1)) + longNumber;
var second = first + longitudeBands + 1;
indexData.push(first);
indexData.push(second);
indexData.push(first + 1);
indexData.push(second);
indexData.push(second + 1);
indexData.push(first + 1);
}
}
moonVertexNormalBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexNormalBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(normalData), gl.STATIC_DRAW);
moonVertexNormalBuffer.itemSize = 3;
moonVertexNormalBuffer.numItems = normalData.length / 3;
moonVertexTextureCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexTextureCoordBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureCoordData), gl.STATIC_DRAW);
moonVertexTextureCoordBuffer.itemSize = 2;
moonVertexTextureCoordBuffer.numItems = textureCoordData.length / 2;
moonVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexPositionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertexPositionData), gl.STATIC_DRAW);
moonVertexPositionBuffer.itemSize = 3;
moonVertexPositionBuffer.numItems = vertexPositionData.length / 3;
moonVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, moonVertexIndexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(indexData), gl.STATIC_DRAW);
moonVertexIndexBuffer.itemSize = 1;
moonVertexIndexBuffer.numItems = indexData.length;
}
function drawScene() {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
//IMPORTANT: perspective
mat4.perspective(70, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0, pMatrix);
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, [0, 0, 0]);
mat4.multiply(mvMatrix, moonRotationMatrix);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, moonTexture);
gl.uniform1i(shaderProgram.samplerUniform, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, moonVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexTextureCoordBuffer);
gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, moonVertexTextureCoordBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexNormalBuffer);
gl.vertexAttribPointer(shaderProgram.vertexNormalAttribute, moonVertexNormalBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, moonVertexIndexBuffer);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, moonVertexIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
//update the video texture every frame
gl.bindTexture(gl.TEXTURE_2D, moonTexture);
//gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA,
gl.UNSIGNED_BYTE, moonTexture.image);
}
var controls = {
playEl: document.getElementById("play-button"),
soundEl: document.getElementById("sound-button"),
fullscreenEl: document.getElementById("fullscreen-button"),
seekerBackEl: document.getElementById("seeker-back"),
seekerEl: document.getElementById("seeker"),
videoEl: document.getElementById("video"),
play: function() {
if (controls.videoEl.currentTime > 0 && !controls.videoEl.paused) {
controls.videoEl.pause();
controls.playEl.className = "";
}
else if (controls.videoEl.paused) {
controls.videoEl.play();
controls.playEl.className = "pause";
}
},
seekTo: function(ratio) {
this.seekerEl.style.width = (ratio * this.seekerBackEl.offsetWidth) + "px";
},
getSeekRatio(x) {
return x / this.seekerBackEl.offsetWidth;
},
muted: function(b) {
this.soundEl.className = b?"mute":"";
}
}
function tick() {
//mouse control
var diffX = 0;
var diffY = 0;
if (mouseDown) {
diffX = newX - lastMouseX;
diffY = newY - lastMouseY;
}
speedX -= (speedX-diffX)*0.15;
speedY -= (speedY-diffY)*0.15;
camRotX += degToRad(speedX)/4;
camRotY += degToRad(speedY)/4;
if (camRotY > Math.PI / 2) camRotY = Math.PI / 2;
if (camRotY < -Math.PI / 2) camRotY = -Math.PI / 2;
mat4.identity(moonRotationMatrix);
mat4.rotate(moonRotationMatrix, camRotY, [1, 0, 0]);
mat4.rotate(moonRotationMatrix, camRotX + Math.PI*3/2, [0, 1, 0]);
lastMouseX = newX;
lastMouseY = newY;
//gui stuff
controls.seekTo(controls.videoEl.currentTime / controls.videoEl.duration);
//normal stuff
requestAnimFrame(tick);
drawScene();
}
function webGLStart() {
controls.videoEl.preload = 'auto';
controls.videoEl.src = "videoplayback720p.mp4";
controls.playEl.addEventListener("click", controls.play);
controls.seekerBackEl.addEventListener("click", function(e) {
var measure = controls.seekerBackEl.getBoundingClientRect()
controls.videoEl.currentTime = controls.getSeekRatio(e.clientX - measure.left) * controls.videoEl.duration;
});
controls.videoEl.addEventListener('canplaythrough', function() {
console.log("hi")
controls.play();
var canvas = document.getElementById("c");
initGL(canvas);
initShaders();
initBuffers();
initTexture();
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.enable(gl.DEPTH_TEST);
canvas.onmousedown = handleMouseDown;
document.onmouseup = handleMouseUp;
document.onmousemove = handleMouseMove;
//rotate sphere into front of video
var newRotationMatrix = mat4.create();
mat4.identity(newRotationMatrix);
mat4.rotate(newRotationMatrix, Math.PI*1.5, [0, 1, 0]);
mat4.multiply(newRotationMatrix, moonRotationMatrix, moonRotationMatrix);
tick();
}, true);
}
</script>
</body>
</html>