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utils.js
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utils.js
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//Matthew Shotton, R&D User Experience,© BBC 2015
import DEFINITIONS from "./Definitions/definitions.js";
import { SOURCENODESTATE } from "./SourceNodes/sourcenode.js";
/*
* Utility function to compile a WebGL Vertex or Fragment shader.
*
* @param {WebGLRenderingContext} gl - the webgl context fo which to build the shader.
* @param {String} shaderSource - A string of shader code to compile.
* @param {number} shaderType - Shader type, either WebGLRenderingContext.VERTEX_SHADER or WebGLRenderingContext.FRAGMENT_SHADER.
*
* @return {WebGLShader} A compiled shader.
*
*/
export function compileShader(gl, shaderSource, shaderType) {
let shader = gl.createShader(shaderType);
gl.shaderSource(shader, shaderSource);
gl.compileShader(shader);
let success = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
if (!success) {
throw "could not compile shader:" + gl.getShaderInfoLog(shader);
}
return shader;
}
/*
* Create a shader program from a passed vertex and fragment shader source string.
*
* @param {WebGLRenderingContext} gl - the webgl context fo which to build the shader.
* @param {WebGLShader} vertexShader - A compiled vertex shader.
* @param {WebGLShader} fragmentShader - A compiled fragment shader.
*
* @return {WebGLProgram} A compiled & linkde shader program.
*/
export function createShaderProgram(gl, vertexShader, fragmentShader){
let program = gl.createProgram();
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS)){
throw {"error":4,"msg":"Can't link shader program for track", toString:function(){return this.msg;}};
}
return program;
}
export function createElementTexutre(gl){
let texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
// Set the parameters so we can render any size image.
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_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
//Initialise the texture untit to clear.
//gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, type);
return texture;
}
export function updateTexture(gl, texture, element){
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, element);
}
export function clearTexture(gl, texture){
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array([0,0,0,0]));
}
export function generateRandomId(){
const appearanceAdjective = ["adorable", "alert", "average", "beautiful", "blonde", "bloody", "blushing", "bright", "clean", "clear", "cloudy", "colourful", "concerned","crowded", "curious", "cute", "dark", "dirty", "drab", "distinct", "dull", "elegant", "fancy", "filthy", "glamorous", "gleaming", "graceful", "grotesque", "homely", "light", "misty", "motionless", "muddy", "plain", "poised", "quaint", "scary", "shiny", "smoggy", "sparkling", "spotless", "stormy", "strange", "ugly", "unsightly", "unusual"];
const conditionAdjective = ["alive", "brainy", "broken", "busy", "careful","cautious", "clever", "crazy", "damaged", "dead", "difficult","easy","fake", "false","famous", "forward", "fragile","guilty", "helpful","helpless","important", "impossible","infamous","innocent", "inquisitive", "mad", "modern", "open", "outgoing", "outstanding","poor", "powerful","puzzled", "real", "rich", "right", "robust","sane", "scary", "shy", "sleepy","stupid", "super", "tame", "thick","tired","wild", "wrong"];
const nounAnimal = ["manatee", "gila monster", "nematode", "seahorse", "slug", "koala bear", "giant tortoise","garden snail", "starfish", "sloth", "american woodcock", "coral", "swallowtail butterfly", "house sparrow", "sea anemone"];
function randomChoice(array){
return array[Math.floor(Math.random() * array.length)];
}
function capitalize(word){
word = word.replace(/\b\w/g, l => l.toUpperCase());
return word;
}
let name = randomChoice(appearanceAdjective) + " " + randomChoice(conditionAdjective) + " " + randomChoice(nounAnimal);
name = capitalize(name);
name = name.replace(/ /g, "-");
return name;
}
export function exportToJSON(vc) {
console.warn("VideoContext.exportToJSON has been deprecated. Please use VideoContext.snapshot instead.");
return JSON.stringify(snapshotNodes(vc));
}
export function snapshot(vc) {
return {
nodes: snapshotNodes(vc),
videoContext: snapshotVideoContext(vc)
};
}
function snapshotVideoContext(vc) {
return {
currentTime: vc.currentTime,
duration: vc.duration,
state: vc.state,
playbackRate: vc.playbackRate,
};
}
function snapshotNodes(vc){
function qualifyURL(url) {
var a = document.createElement("a");
a.href = url;
return a.href;
}
function getInputIDs(node, vc){
let inputs = [];
for (let input of node.inputs){
if (input === undefined)continue;
let inputID;
let inputIndex = node.inputs.indexOf(input);
let index = vc._processingNodes.indexOf(input);
if (index > -1){
inputID = "processor" + index;
} else{
let index = vc._sourceNodes.indexOf(input);
if(index > -1){
inputID = "source" + index;
} else {
console.log("Warning, can't find input",input);
}
}
inputs.push({id:inputID, index:inputIndex});
}
return inputs;
}
let result = {};
let sourceNodeStateMapping = [];
for (let state in SOURCENODESTATE){
sourceNodeStateMapping[SOURCENODESTATE[state]] = state;
}
for(let index in vc._sourceNodes){
let source = vc._sourceNodes[index];
let id = "source" + index;
let node_url = "";
if(!source._isResponsibleForElementLifeCycle){
console.debug("Warning - Trying to export source created from an element not a URL. URL of export will be set to the elements src attribute and may be incorrect", source);
node_url = source.element.src;
} else {
node_url = qualifyURL(source._elementURL);
}
let node = {
type: source.displayName,
url: node_url,
start: source.startTime,
stop: source.stopTime,
state: sourceNodeStateMapping[source.state],
};
if (node.type === "VideoNode") {
node.currentTime = null;
if(source.element && source.element.currentTime) {
node.currentTime = source.element.currentTime;
}
}
if (source._sourceOffset){
node.sourceOffset = source._sourceOffset;
}
result[id] = node;
}
for (let index in vc._processingNodes){
let processor = vc._processingNodes[index];
let id = "processor" + index;
let node = {
type: processor.displayName,
definition: processor._definition,
inputs: getInputIDs(processor, vc),
properties:{}
};
for(let property in node.definition.properties){
node.properties[property] = processor[property];
}
if (node.type === "TransitionNode"){
node.transitions = processor._transitions;
}
result[id] = node;
}
result["destination"] = {
type:"Destination",
inputs: getInputIDs(vc.destination, vc)
};
return result;
}
export function createControlFormForNode(node, nodeName){
let rootDiv = document.createElement("div");
if (nodeName !== undefined){
var title = document.createElement("h2");
title.innerHTML = nodeName;
rootDiv.appendChild(title);
}
for(let propertyName in node._properties){
let propertyParagraph = document.createElement("p");
let propertyTitleHeader = document.createElement("h3");
propertyTitleHeader.innerHTML = propertyName;
propertyParagraph.appendChild(propertyTitleHeader);
let propertyValue = node._properties[propertyName].value;
if (typeof propertyValue === "number"){
let range = document.createElement("input");
range.setAttribute("type", "range");
range.setAttribute("min", "0");
range.setAttribute("max", "1");
range.setAttribute("step", "0.01");
range.setAttribute("value", propertyValue,toString());
let number = document.createElement("input");
number.setAttribute("type", "number");
number.setAttribute("min", "0");
number.setAttribute("max", "1");
number.setAttribute("step", "0.01");
number.setAttribute("value", propertyValue,toString());
let mouseDown = false;
range.onmousedown =function(){mouseDown=true;};
range.onmouseup =function(){mouseDown=false;};
range.onmousemove = function(){
if(mouseDown){
node[propertyName] = parseFloat(range.value);
number.value = range.value;
}
};
range.onchange = function(){
node[propertyName] = parseFloat(range.value);
number.value = range.value;
};
number.onchange =function(){
node[propertyName] = parseFloat(number.value);
range.value = number.value;
};
propertyParagraph.appendChild(range);
propertyParagraph.appendChild(number);
}
else if(Object.prototype.toString.call(propertyValue) === "[object Array]"){
for (var i = 0; i < propertyValue.length; i++) {
let range = document.createElement("input");
range.setAttribute("type", "range");
range.setAttribute("min", "0");
range.setAttribute("max", "1");
range.setAttribute("step", "0.01");
range.setAttribute("value", propertyValue[i],toString());
let number = document.createElement("input");
number.setAttribute("type", "number");
number.setAttribute("min", "0");
number.setAttribute("max", "1");
number.setAttribute("step", "0.01");
number.setAttribute("value", propertyValue,toString());
let index = i;
let mouseDown = false;
range.onmousedown =function(){mouseDown=true;};
range.onmouseup =function(){mouseDown=false;};
range.onmousemove = function(){
if(mouseDown){
node[propertyName][index] = parseFloat(range.value);
number.value = range.value;
}
};
range.onchange = function(){
node[propertyName][index] = parseFloat(range.value);
number.value = range.value;
};
number.onchange = function(){
node[propertyName][index] = parseFloat(number.value);
range.value = number.value;
};
propertyParagraph.appendChild(range);
propertyParagraph.appendChild(number);
}
}
rootDiv.appendChild(propertyParagraph);
}
return rootDiv;
}
function calculateNodeDepthFromDestination(videoContext){
let destination = videoContext.destination;
let depthMap= new Map();
depthMap.set(destination, 0);
function itterateBackwards(node, depth=0){
for (let n of node.inputs){
let d = depth + 1;
if (depthMap.has(n)){
if (d > depthMap.get(n)){
depthMap.set(n, d);
}
} else{
depthMap.set(n,d);
}
itterateBackwards(n, depthMap.get(n));
}
}
itterateBackwards(destination);
return depthMap;
}
export function visualiseVideoContextGraph(videoContext, canvas){
let ctx = canvas.getContext("2d");
let w = canvas.width;
let h = canvas.height;
ctx.clearRect(0,0,w,h);
let nodeDepths = calculateNodeDepthFromDestination(videoContext);
let depths = nodeDepths.values();
depths = Array.from(depths).sort(function(a, b){return b-a;});
let maxDepth = depths[0];
let xStep = w / (maxDepth+1);
let nodeHeight = (h / videoContext._sourceNodes.length)/3;
let nodeWidth = nodeHeight * 1.618;
function calculateNodePos(node, nodeDepths, xStep, nodeHeight){
let depth = nodeDepths.get(node);
nodeDepths.values();
let count = 0;
for(let nodeDepth of nodeDepths){
if (nodeDepth[0] === node) break;
if (nodeDepth[1] === depth) count += 1;
}
return {x:(xStep*nodeDepths.get(node)), y:nodeHeight*1.5*count + 50};
}
// "video":["#572A72", "#3C1255"],
// "image":["#7D9F35", "#577714"],
// "canvas":["#AA9639", "#806D15"]
for (let i = 0; i < videoContext._renderGraph.connections.length; i++) {
let conn = videoContext._renderGraph.connections[i];
let source = calculateNodePos(conn.source, nodeDepths, xStep, nodeHeight);
let destination = calculateNodePos(conn.destination, nodeDepths, xStep, nodeHeight);
if (source !== undefined && destination !== undefined){
ctx.beginPath();
//ctx.moveTo(source.x + nodeWidth/2, source.y + nodeHeight/2);
let x1 = source.x + nodeWidth/2;
let y1 = source.y + nodeHeight/2;
let x2 = destination.x + nodeWidth/2;
let y2 = destination.y + nodeHeight/2;
let dx = x2 - x1;
let dy = y2 - y1;
let angle = Math.PI/2 - Math.atan2(dx,dy);
let distance = Math.sqrt(Math.pow(x1-x2,2) + Math.pow(y1-y2,2));
let midX = Math.min(x1, x2) + (Math.max(x1,x2) - Math.min(x1, x2))/2;
let midY = Math.min(y1, y2) + (Math.max(y1,y2) - Math.min(y1, y2))/2;
let testX = (Math.cos(angle + Math.PI/2))*distance/1.5 + midX;
let testY = (Math.sin(angle + Math.PI/2))*distance/1.5 + midY;
// console.log(testX, testY);
ctx.arc(testX, testY, distance/1.2, angle-Math.PI+0.95, angle-0.95);
//ctx.arcTo(source.x + nodeWidth/2 ,source.y + nodeHeight/2,destination.x + nodeWidth/2,destination.y + nodeHeight/2,100);
//ctx.lineTo(midX, midY);
ctx.stroke();
//ctx.endPath();
}
}
for(let node of nodeDepths.keys()){
let pos = calculateNodePos(node, nodeDepths, xStep, nodeHeight);
let color = "#AA9639";
let text = "";
if (node.displayName === "CompositingNode"){
color = "#000000";
}
if (node.displayName === "DestinationNode"){
color = "#7D9F35";
text="Output";
}
if (node.displayName === "VideoNode"){
color = "#572A72";
text = "Video";
}
if (node.displayName === "CanvasNode"){
color = "#572A72";
text = "Canvas";
}
if (node.displayName === "ImageNode"){
color = "#572A72";
text = "Image";
}
ctx.beginPath();
ctx.fillStyle = color;
ctx.fillRect(pos.x, pos.y, nodeWidth, nodeHeight);
ctx.fill();
ctx.fillStyle = "#000";
ctx.textAlign = "center";
ctx.font = "10px Arial";
ctx.fillText(text,pos.x+nodeWidth/2, pos.y+nodeHeight/2+2.5);
ctx.fill();
}
return;
}
export function createSigmaGraphDataFromRenderGraph(videoContext){
function idForNode(node){
if (videoContext._sourceNodes.indexOf(node) !== -1){
let id = "source " + node.displayName+ " "+videoContext._sourceNodes.indexOf(node);
return id;
}
let id = "processor " + node.displayName + " "+videoContext._processingNodes.indexOf(node);
return id;
}
let graph = {
nodes:[
{
id: idForNode(videoContext.destination),
label:"Destination Node",
x:2.5,
y:0.5,
size:2,
node: videoContext.destination
}],
edges:[]
};
for (let i = 0; i < videoContext._sourceNodes.length; i++) {
let sourceNode = videoContext._sourceNodes[i];
let y = i * (1.0 / videoContext._sourceNodes.length);
graph.nodes.push({
id: idForNode(sourceNode),
label:"Source "+ i.toString(),
x:0,
y: y,
size:2,
color:"#572A72",
node:sourceNode
});
}
for (let i = 0; i < videoContext._processingNodes.length; i++) {
let processingNode = videoContext._processingNodes[i];
graph.nodes.push({
id: idForNode(processingNode),
x: Math.random() *2.5,
y: Math.random(),
size:2,
node: processingNode
});
}
for (let i = 0; i < videoContext._renderGraph.connections.length; i++) {
let conn = videoContext._renderGraph.connections[i];
graph.edges.push({
"id":"e"+i.toString(),
"source": idForNode(conn.source),
"target": idForNode(conn.destination)
});
}
return graph;
}
export function importSimpleEDL(ctx, playlist){
// Create a "track" node to connect all the clips to.
let trackNode = ctx.compositor(DEFINITIONS.COMBINE);
// Create a source node for each of the clips.
for (let clip of playlist){
let node;
if (clip.type === "video"){
node = ctx.video(clip.src, clip.sourceStart);
} else if (clip.type === "image"){
node = ctx.image(clip.src, clip.sourceStart);
}else {
console.debug("Clip type \"" + clip.type + "\" not recognised, skipping.");
continue;
}
node.startAt(clip.start);
node.stopAt(clip.start + clip.duration);
node.connect(trackNode);
}
return trackNode;
}
export function visualiseVideoContextTimeline(videoContext, canvas, currentTime){
let ctx = canvas.getContext("2d");
let w = canvas.width;
let h = canvas.height;
let trackHeight = h / videoContext._sourceNodes.length;
let playlistDuration = videoContext.duration;
if (currentTime > playlistDuration && !videoContext.endOnLastSourceEnd) playlistDuration = currentTime;
if (videoContext.duration === Infinity){
let total = 0;
for (let i = 0; i < videoContext._sourceNodes.length; i++) {
let sourceNode = videoContext._sourceNodes[i];
if(sourceNode._stopTime !== Infinity) total += sourceNode._stopTime;
}
if (total > videoContext.currentTime){
playlistDuration = total+5;
}else{
playlistDuration = videoContext.currentTime+5;
}
}
let pixelsPerSecond = w / playlistDuration;
let mediaSourceStyle = {
"video":["#572A72", "#3C1255"],
"image":["#7D9F35", "#577714"],
"canvas":["#AA9639", "#806D15"]
};
ctx.clearRect(0,0,w,h);
ctx.fillStyle = "#999";
for(let node of videoContext._processingNodes){
if (node.displayName !== "TransitionNode") continue;
for(let propertyName in node._transitions){
for(let transition of node._transitions[propertyName]){
let tW = (transition.end - transition.start) * pixelsPerSecond;
let tH = h;
let tX = transition.start * pixelsPerSecond;
let tY = 0;
ctx.fillStyle = "rgba(0,0,0, 0.3)";
ctx.fillRect(tX, tY, tW, tH);
ctx.fill();
}
}
}
for (let i = 0; i < videoContext._sourceNodes.length; i++) {
let sourceNode = videoContext._sourceNodes[i];
let duration = sourceNode._stopTime - sourceNode._startTime;
if(duration=== Infinity) duration = videoContext.currentTime;
let start = sourceNode._startTime;
let msW = duration * pixelsPerSecond;
let msH = trackHeight;
let msX = start * pixelsPerSecond;
let msY = trackHeight * i;
ctx.fillStyle = mediaSourceStyle.video[i%mediaSourceStyle.video.length];
ctx.fillRect(msX,msY,msW,msH);
ctx.fill();
}
if (currentTime !== undefined){
ctx.fillStyle = "#000";
ctx.fillRect(currentTime*pixelsPerSecond, 0, 1, h);
}
}
export class UpdateablesManager{
constructor(){
this._updateables = [];
this._useWebworker = false;
this._active = false;
this._previousRAFTime = undefined;
this._previousWorkerTime = undefined;
this._webWorkerString = "\
var running = false;\
function tick(){\
postMessage(Date.now());\
if (running){\
setTimeout(tick, 1000/20);\
}\
}\
self.addEventListener('message',function(msg){\
var data = msg.data;\
if (data === 'start'){\
running = true;\
tick();\
}\
if (data === 'stop') running = false;\
});";
this._webWorker = undefined;
}
_initWebWorker(){
window.URL = window.URL || window.webkitURL;
let blob = new Blob([this._webWorkerString], {type: "application/javascript"});
this._webWorker = new Worker(URL.createObjectURL(blob));
this._webWorker.onmessage = (msg)=>{
let time = msg.data;
this._updateWorkerTime(time);
};
}
_lostVisibility(){
this._previousWorkerTime = Date.now();
this._useWebworker = true;
if (!this._webWorker){
this._initWebWorker();
}
this._webWorker.postMessage("start");
}
_gainedVisibility(){
this._useWebworker = false;
this._previousRAFTime = undefined;
if(this._webWorker) this._webWorker.postMessage("stop");
requestAnimationFrame(this._updateRAFTime.bind(this));
}
_init(){
if(!window.Worker)return;
//If page visibility API not present fallback to using "focus" and "blur" event listeners.
if (typeof document.hidden === "undefined") {
window.addEventListener("focus", this._gainedVisibility.bind(this));
window.addEventListener("blur", this._lostVisibility.bind(this));
return;
}
//Otherwise we can use the visibility API to do the loose/gain focus properly
document.addEventListener("visibilitychange", ()=>{
if (document.hidden === true) {
this._lostVisibility();
} else {
this._gainedVisibility();
}
}, false);
requestAnimationFrame(this._updateRAFTime.bind(this));
}
_updateWorkerTime(time){
let dt = (time - this._previousWorkerTime) / 1000;
if (dt !== 0) this._update(dt);
this._previousWorkerTime = time;
}
_updateRAFTime(time){
if (this._previousRAFTime === undefined)this._previousRAFTime = time;
let dt = (time - this._previousRAFTime) / 1000;
if (dt !== 0) this._update(dt);
this._previousRAFTime = time;
if(!this._useWebworker)requestAnimationFrame(this._updateRAFTime.bind(this));
}
_update(dt){
for(let i = 0; i < this._updateables.length; i++){
this._updateables[i]._update(parseFloat(dt));
}
}
register(updateable){
this._updateables.push(updateable);
if (this._active === false){
this._active = true;
this._init();
}
}
}