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scenejs.js
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scenejs.js
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/*
* SceneJS WebGL Scene Graph Library for JavaScript
* http://scenejs.org/
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://scenejs.org/license
* Copyright 2010, Lindsay Kay
*
*
*/// Only define RequireJS if not already present
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RequireJS 2.1.6 Copyright (c) 2010-2012, The Dojo Foundation All Rights Reserved.
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WebGLDebugUtils = function() {
/**
* Wrapped logging function.
* @param {string} msg Message to log.
*/
var log = function(msg) {
if (window.console && window.console.log) {
window.console.log(msg);
}
};
/**
* Which arguements are enums.
* @type {!Object.<number, string>}
*/
var glValidEnumContexts = {
// Generic setters and getters
'enable': { 0:true },
'disable': { 0:true },
'getParameter': { 0:true },
// Rendering
'drawArrays': { 0:true },
'drawElements': { 0:true, 2:true },
// Shaders
'createShader': { 0:true },
'getShaderParameter': { 1:true },
'getProgramParameter': { 1:true },
// Vertex attributes
'getVertexAttrib': { 1:true },
'vertexAttribPointer': { 2:true },
// Textures
'bindTexture': { 0:true },
'activeTexture': { 0:true },
'getTexParameter': { 0:true, 1:true },
'texParameterf': { 0:true, 1:true },
'texParameteri': { 0:true, 1:true, 2:true },
'texImage2D': { 0:true, 2:true, 6:true, 7:true },
'texSubImage2D': { 0:true, 6:true, 7:true },
'copyTexImage2D': { 0:true, 2:true },
'copyTexSubImage2D': { 0:true },
'generateMipmap': { 0:true },
// Buffer objects
'bindBuffer': { 0:true },
'bufferData': { 0:true, 2:true },
'bufferSubData': { 0:true },
'getBufferParameter': { 0:true, 1:true },
// Renderbuffers and framebuffers
'pixelStorei': { 0:true, 1:true },
'readPixels': { 4:true, 5:true },
'bindRenderbuffer': { 0:true },
'bindFramebuffer': { 0:true },
'checkFramebufferStatus': { 0:true },
'framebufferRenderbuffer': { 0:true, 1:true, 2:true },
'framebufferTexture2D': { 0:true, 1:true, 2:true },
'getFramebufferAttachmentParameter': { 0:true, 1:true, 2:true },
'getRenderbufferParameter': { 0:true, 1:true },
'renderbufferStorage': { 0:true, 1:true },
// Frame buffer operations (clear, blend, depth test, stencil)
'clear': { 0:true },
'depthFunc': { 0:true },
'blendFunc': { 0:true, 1:true },
'blendFuncSeparate': { 0:true, 1:true, 2:true, 3:true },
'blendEquation': { 0:true },
'blendEquationSeparate': { 0:true, 1:true },
'stencilFunc': { 0:true },
'stencilFuncSeparate': { 0:true, 1:true },
'stencilMaskSeparate': { 0:true },
'stencilOp': { 0:true, 1:true, 2:true },
'stencilOpSeparate': { 0:true, 1:true, 2:true, 3:true },
// Culling
'cullFace': { 0:true },
'frontFace': { 0:true },
};
/**
* Map of numbers to names.
* @type {Object}
*/
var glEnums = null;
/**
* Initializes this module. Safe to call more than once.
* @param {!WebGLRenderingContext} ctx A WebGL context. If
* you have more than one context it doesn't matter which one
* you pass in, it is only used to pull out constants.
*/
function init(ctx) {
if (glEnums == null) {
glEnums = { };
for (var propertyName in ctx) {
if (typeof ctx[propertyName] == 'number') {
glEnums[ctx[propertyName]] = propertyName;
}
}
}
}
/**
* Checks the utils have been initialized.
*/
function checkInit() {
if (glEnums == null) {
throw 'WebGLDebugUtils.init(ctx) not called';
}
}
/**
* Returns true or false if value matches any WebGL enum
* @param {*} value Value to check if it might be an enum.
* @return {boolean} True if value matches one of the WebGL defined enums
*/
function mightBeEnum(value) {
checkInit();
return (glEnums[value] !== undefined);
}
/**
* Gets an string version of an WebGL enum.
*
* Example:
* var str = WebGLDebugUtil.glEnumToString(ctx.getError());
*
* @param {number} value Value to return an enum for
* @return {string} The string version of the enum.
*/
function glEnumToString(value) {
checkInit();
var name = glEnums[value];
return (name !== undefined) ? name :
("*UNKNOWN WebGL ENUM (0x" + value.toString(16) + ")");
}
/**
* Returns the string version of a WebGL argument.
* Attempts to convert enum arguments to strings.
* @param {string} functionName the name of the WebGL function.
* @param {number} argumentIndx the index of the argument.
* @param {*} value The value of the argument.
* @return {string} The value as a string.
*/
function glFunctionArgToString(functionName, argumentIndex, value) {
var funcInfo = glValidEnumContexts[functionName];
if (funcInfo !== undefined) {
if (funcInfo[argumentIndex]) {
return glEnumToString(value);
}
}
if (value === null) {
return "null";
} else if (value === undefined) {
return "undefined";
} else {
return value.toString();
}
}
/**
* Converts the arguments of a WebGL function to a string.
* Attempts to convert enum arguments to strings.
*
* @param {string} functionName the name of the WebGL function.
* @param {number} args The arguments.
* @return {string} The arguments as a string.
*/
function glFunctionArgsToString(functionName, args) {
// apparently we can't do args.join(",");
var argStr = "";
for (var ii = 0; ii < args.length; ++ii) {
argStr += ((ii == 0) ? '' : ', ') +
glFunctionArgToString(functionName, ii, args[ii]);
}
return argStr;
};
function makePropertyWrapper(wrapper, original, propertyName) {
//log("wrap prop: " + propertyName);
wrapper.__defineGetter__(propertyName, function() {
return original[propertyName];
});
// TODO(gmane): this needs to handle properties that take more than
// one value?
wrapper.__defineSetter__(propertyName, function(value) {
//log("set: " + propertyName);
original[propertyName] = value;
});
}
// Makes a function that calls a function on another object.
function makeFunctionWrapper(original, functionName) {
//log("wrap fn: " + functionName);
var f = original[functionName];
return function() {
//log("call: " + functionName);
var result = f.apply(original, arguments);
return result;
};
}
/**
* Given a WebGL context returns a wrapped context that calls
* gl.getError after every command and calls a function if the
* result is not gl.NO_ERROR.
*
* @param {!WebGLRenderingContext} ctx The webgl context to
* wrap.
* @param {!function(err, funcName, args): void} opt_onErrorFunc
* The function to call when gl.getError returns an
* error. If not specified the default function calls
* console.log with a message.
* @param {!function(funcName, args): void} opt_onFunc The
* function to call when each webgl function is called.
* You can use this to log all calls for example.
*/
function makeDebugContext(ctx, opt_onErrorFunc, opt_onFunc) {
init(ctx);
opt_onErrorFunc = opt_onErrorFunc || function(err, functionName, args) {
// apparently we can't do args.join(",");
var argStr = "";
for (var ii = 0; ii < args.length; ++ii) {
argStr += ((ii == 0) ? '' : ', ') +
glFunctionArgToString(functionName, ii, args[ii]);
}
log("WebGL error "+ glEnumToString(err) + " in "+ functionName +
"(" + argStr + ")");
};
// Holds booleans for each GL error so after we get the error ourselves
// we can still return it to the client app.
var glErrorShadow = { };
// Makes a function that calls a WebGL function and then calls getError.
function makeErrorWrapper(ctx, functionName) {
return function() {
if (opt_onFunc) {
opt_onFunc(functionName, arguments);
}
var result = ctx[functionName].apply(ctx, arguments);
var err = ctx.getError();
if (err != 0) {
glErrorShadow[err] = true;
opt_onErrorFunc(err, functionName, arguments);
}
return result;
};
}
// Make a an object that has a copy of every property of the WebGL context
// but wraps all functions.
var wrapper = {};
for (var propertyName in ctx) {
if (typeof ctx[propertyName] == 'function') {
wrapper[propertyName] = makeErrorWrapper(ctx, propertyName);
} else {
makePropertyWrapper(wrapper, ctx, propertyName);
}
}
// Override the getError function with one that returns our saved results.
wrapper.getError = function() {
for (var err in glErrorShadow) {
if (glErrorShadow.hasOwnProperty(err)) {
if (glErrorShadow[err]) {
glErrorShadow[err] = false;
return err;
}
}
}
return ctx.NO_ERROR;
};
return wrapper;
}
function resetToInitialState(ctx) {
var numAttribs = ctx.getParameter(ctx.MAX_VERTEX_ATTRIBS);
var tmp = ctx.createBuffer();
ctx.bindBuffer(ctx.ARRAY_BUFFER, tmp);
for (var ii = 0; ii < numAttribs; ++ii) {
ctx.disableVertexAttribArray(ii);
ctx.vertexAttribPointer(ii, 4, ctx.FLOAT, false, 0, 0);
ctx.vertexAttrib1f(ii, 0);
}
ctx.deleteBuffer(tmp);
var numTextureUnits = ctx.getParameter(ctx.MAX_TEXTURE_IMAGE_UNITS);
for (var ii = 0; ii < numTextureUnits; ++ii) {
ctx.activeTexture(ctx.TEXTURE0 + ii);
ctx.bindTexture(ctx.TEXTURE_CUBE_MAP, null);
ctx.bindTexture(ctx.TEXTURE_2D, null);
}
ctx.activeTexture(ctx.TEXTURE0);
ctx.useProgram(null);
ctx.bindBuffer(ctx.ARRAY_BUFFER, null);
ctx.bindBuffer(ctx.ELEMENT_ARRAY_BUFFER, null);
ctx.bindFramebuffer(ctx.FRAMEBUFFER, null);
ctx.bindRenderbuffer(ctx.RENDERBUFFER, null);
ctx.disable(ctx.BLEND);
ctx.disable(ctx.CULL_FACE);
ctx.disable(ctx.DEPTH_TEST);
ctx.disable(ctx.DITHER);
ctx.disable(ctx.SCISSOR_TEST);
ctx.blendColor(0, 0, 0, 0);
ctx.blendEquation(ctx.FUNC_ADD);
ctx.blendFunc(ctx.ONE, ctx.ZERO);
ctx.clearColor(0, 0, 0, 0);
ctx.clearDepth(1);
ctx.clearStencil(-1);
ctx.colorMask(true, true, true, true);
ctx.cullFace(ctx.BACK);
ctx.depthFunc(ctx.LESS);
ctx.depthMask(true);
ctx.depthRange(0, 1);
ctx.frontFace(ctx.CCW);
ctx.hint(ctx.GENERATE_MIPMAP_HINT, ctx.DONT_CARE);
ctx.lineWidth(1);
ctx.pixelStorei(ctx.PACK_ALIGNMENT, 4);
ctx.pixelStorei(ctx.UNPACK_ALIGNMENT, 4);
ctx.pixelStorei(ctx.UNPACK_FLIP_Y_WEBGL, false);
ctx.pixelStorei(ctx.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
// TODO: Delete this IF.
if (ctx.UNPACK_COLORSPACE_CONVERSION_WEBGL) {
ctx.pixelStorei(ctx.UNPACK_COLORSPACE_CONVERSION_WEBGL, ctx.BROWSER_DEFAULT_WEBGL);
}
ctx.polygonOffset(0, 0);
ctx.sampleCoverage(1, false);
ctx.scissor(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.stencilFunc(ctx.ALWAYS, 0, 0xFFFFFFFF);
ctx.stencilMask(0xFFFFFFFF);
ctx.stencilOp(ctx.KEEP, ctx.KEEP, ctx.KEEP);
ctx.viewport(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.clear(ctx.COLOR_BUFFER_BIT | ctx.DEPTH_BUFFER_BIT | ctx.STENCIL_BUFFER_BIT);
// TODO: This should NOT be needed but Firefox fails with 'hint'
while(ctx.getError());
}
function makeLostContextSimulatingCanvas(canvas) {
var unwrappedContext_;
var wrappedContext_;
var onLost_ = [];
var onRestored_ = [];
var wrappedContext_ = {};
var contextId_ = 1;
var contextLost_ = false;
var resourceId_ = 0;
var resourceDb_ = [];
var numCallsToLoseContext_ = 0;
var numCalls_ = 0;
var canRestore_ = false;
var restoreTimeout_ = 0;
// Holds booleans for each GL error so can simulate errors.
var glErrorShadow_ = { };
canvas.getContext = function(f) {
return function() {
var ctx = f.apply(canvas, arguments);
// Did we get a context and is it a WebGL context?
if (ctx instanceof WebGLRenderingContext) {
if (ctx != unwrappedContext_) {
if (unwrappedContext_) {
throw "got different context"
}
unwrappedContext_ = ctx;
wrappedContext_ = makeLostContextSimulatingContext(unwrappedContext_);
}
return wrappedContext_;
}
return ctx;
}
}(canvas.getContext);
function wrapEvent(listener) {
if (typeof(listener) == "function") {
return listener;
} else {
return function(info) {
listener.handleEvent(info);
}
}
}
var addOnContextLostListener = function(listener) {
onLost_.push(wrapEvent(listener));
};
var addOnContextRestoredListener = function(listener) {
onRestored_.push(wrapEvent(listener));
};
function wrapAddEventListener(canvas) {
var f = canvas.addEventListener;
canvas.addEventListener = function(type, listener, bubble) {
switch (type) {
case 'webglcontextlost':
addOnContextLostListener(listener);
break;
case 'webglcontextrestored':
addOnContextRestoredListener(listener);
break;
default:
f.apply(canvas, arguments);
}
};
}
wrapAddEventListener(canvas);
canvas.loseContext = function() {
if (!contextLost_) {
contextLost_ = true;
numCallsToLoseContext_ = 0;
++contextId_;
while (unwrappedContext_.getError());
clearErrors();
glErrorShadow_[unwrappedContext_.CONTEXT_LOST_WEBGL] = true;
var event = makeWebGLContextEvent("context lost");
var callbacks = onLost_.slice();
setTimeout(function() {
//log("numCallbacks:" + callbacks.length);
for (var ii = 0; ii < callbacks.length; ++ii) {
//log("calling callback:" + ii);
callbacks[ii](event);
}
if (restoreTimeout_ >= 0) {
setTimeout(function() {
canvas.restoreContext();
}, restoreTimeout_);
}
}, 0);
}
};
canvas.restoreContext = function() {
if (contextLost_) {
if (onRestored_.length) {
setTimeout(function() {
if (!canRestore_) {
throw "can not restore. webglcontestlost listener did not call event.preventDefault";
}
freeResources();
resetToInitialState(unwrappedContext_);
contextLost_ = false;
numCalls_ = 0;
canRestore_ = false;
var callbacks = onRestored_.slice();
var event = makeWebGLContextEvent("context restored");
for (var ii = 0; ii < callbacks.length; ++ii) {
callbacks[ii](event);
}
}, 0);
}
}
};
canvas.loseContextInNCalls = function(numCalls) {
if (contextLost_) {
throw "You can not ask a lost contet to be lost";
}
numCallsToLoseContext_ = numCalls_ + numCalls;
};
canvas.getNumCalls = function() {
return numCalls_;
};
canvas.setRestoreTimeout = function(timeout) {
restoreTimeout_ = timeout;
};
function isWebGLObject(obj) {
//return false;
return (obj instanceof WebGLBuffer ||
obj instanceof WebGLFramebuffer ||
obj instanceof WebGLProgram ||
obj instanceof WebGLRenderbuffer ||
obj instanceof WebGLShader ||
obj instanceof WebGLTexture);
}
function checkResources(args) {
for (var ii = 0; ii < args.length; ++ii) {
var arg = args[ii];
if (isWebGLObject(arg)) {
return arg.__webglDebugContextLostId__ == contextId_;
}
}
return true;
}
function clearErrors() {
var k = Object.keys(glErrorShadow_);
for (var ii = 0; ii < k.length; ++ii) {
delete glErrorShadow_[k];
}
}
function loseContextIfTime() {
++numCalls_;
if (!contextLost_) {
if (numCallsToLoseContext_ == numCalls_) {
canvas.loseContext();
}
}
}
// Makes a function that simulates WebGL when out of context.
function makeLostContextFunctionWrapper(ctx, functionName) {
var f = ctx[functionName];
return function() {
// log("calling:" + functionName);
// Only call the functions if the context is not lost.
loseContextIfTime();
if (!contextLost_) {
//if (!checkResources(arguments)) {
// glErrorShadow_[wrappedContext_.INVALID_OPERATION] = true;
// return;
//}
var result = f.apply(ctx, arguments);
return result;
}
};
}
function freeResources() {
for (var ii = 0; ii < resourceDb_.length; ++ii) {
var resource = resourceDb_[ii];
if (resource instanceof WebGLBuffer) {
unwrappedContext_.deleteBuffer(resource);
} else if (resource instanceof WebGLFramebuffer) {
unwrappedContext_.deleteFramebuffer(resource);
} else if (resource instanceof WebGLProgram) {
unwrappedContext_.deleteProgram(resource);
} else if (resource instanceof WebGLRenderbuffer) {
unwrappedContext_.deleteRenderbuffer(resource);
} else if (resource instanceof WebGLShader) {
unwrappedContext_.deleteShader(resource);
} else if (resource instanceof WebGLTexture) {
unwrappedContext_.deleteTexture(resource);
}
}
}
function makeWebGLContextEvent(statusMessage) {
return {
statusMessage: statusMessage,
preventDefault: function() {
canRestore_ = true;
}
};
}
return canvas;
function makeLostContextSimulatingContext(ctx) {
// copy all functions and properties to wrapper
for (var propertyName in ctx) {
if (typeof ctx[propertyName] == 'function') {
wrappedContext_[propertyName] = makeLostContextFunctionWrapper(
ctx, propertyName);
} else {
makePropertyWrapper(wrappedContext_, ctx, propertyName);
}
}
// Wrap a few functions specially.
wrappedContext_.getError = function() {
loseContextIfTime();
if (!contextLost_) {
var err;
while (err = unwrappedContext_.getError()) {
glErrorShadow_[err] = true;
}
}
for (var err in glErrorShadow_) {
if (glErrorShadow_[err]) {
delete glErrorShadow_[err];
return err;
}
}
return wrappedContext_.NO_ERROR;
};
var creationFunctions = [
"createBuffer",
"createFramebuffer",
"createProgram",
"createRenderbuffer",
"createShader",
"createTexture"
];
for (var ii = 0; ii < creationFunctions.length; ++ii) {
var functionName = creationFunctions[ii];
wrappedContext_[functionName] = function(f) {
return function() {
loseContextIfTime();
if (contextLost_) {
return null;
}
var obj = f.apply(ctx, arguments);
obj.__webglDebugContextLostId__ = contextId_;
resourceDb_.push(obj);
return obj;
};
}(ctx[functionName]);
}
var functionsThatShouldReturnNull = [
"getActiveAttrib",
"getActiveUniform",
"getBufferParameter",
"getContextAttributes",
"getAttachedShaders",
"getFramebufferAttachmentParameter",
"getParameter",
"getProgramParameter",
"getProgramInfoLog",
"getRenderbufferParameter",
"getShaderParameter",
"getShaderInfoLog",
"getShaderSource",
"getTexParameter",
"getUniform",
"getUniformLocation",
"getVertexAttrib"
];
for (var ii = 0; ii < functionsThatShouldReturnNull.length; ++ii) {
var functionName = functionsThatShouldReturnNull[ii];
wrappedContext_[functionName] = function(f) {
return function() {
loseContextIfTime();
if (contextLost_) {
return null;
}
return f.apply(ctx, arguments);
}
}(wrappedContext_[functionName]);
}
var isFunctions = [
"isBuffer",
"isEnabled",
"isFramebuffer",
"isProgram",
"isRenderbuffer",
"isShader",
"isTexture"
];
for (var ii = 0; ii < isFunctions.length; ++ii) {
var functionName = isFunctions[ii];
wrappedContext_[functionName] = function(f) {
return function() {
loseContextIfTime();
if (contextLost_) {
return false;
}
return f.apply(ctx, arguments);
}
}(wrappedContext_[functionName]);
}
wrappedContext_.checkFramebufferStatus = function(f) {
return function() {
loseContextIfTime();
if (contextLost_) {
return wrappedContext_.FRAMEBUFFER_UNSUPPORTED;
}
return f.apply(ctx, arguments);
};
}(wrappedContext_.checkFramebufferStatus);
wrappedContext_.getAttribLocation = function(f) {
return function() {
loseContextIfTime();
if (contextLost_) {
return -1;
}
return f.apply(ctx, arguments);
};
}(wrappedContext_.getAttribLocation);
wrappedContext_.getVertexAttribOffset = function(f) {
return function() {
loseContextIfTime();
if (contextLost_) {
return 0;
}
return f.apply(ctx, arguments);
};
}(wrappedContext_.getVertexAttribOffset);
wrappedContext_.isContextLost = function() {
return contextLost_;
};
return wrappedContext_;
}
}
return {
/**
* Initializes this module. Safe to call more than once.
* @param {!WebGLRenderingContext} ctx A WebGL context. If
}
* you have more than one context it doesn't matter which one
* you pass in, it is only used to pull out constants.
*/
'init': init,
/**
* Returns true or false if value matches any WebGL enum
* @param {*} value Value to check if it might be an enum.
* @return {boolean} True if value matches one of the WebGL defined enums
*/
'mightBeEnum': mightBeEnum,
/**
* Gets an string version of an WebGL enum.
*
* Example:
* WebGLDebugUtil.init(ctx);
* var str = WebGLDebugUtil.glEnumToString(ctx.getError());
*
* @param {number} value Value to return an enum for
* @return {string} The string version of the enum.
*/
'glEnumToString': glEnumToString,
/**
* Converts the argument of a WebGL function to a string.
* Attempts to convert enum arguments to strings.
*
* Example:
* WebGLDebugUtil.init(ctx);
* var str = WebGLDebugUtil.glFunctionArgToString('bindTexture', 0, gl.TEXTURE_2D);
*
* would return 'TEXTURE_2D'
*
* @param {string} functionName the name of the WebGL function.
* @param {number} argumentIndx the index of the argument.
* @param {*} value The value of the argument.
* @return {string} The value as a string.
*/
'glFunctionArgToString': glFunctionArgToString,
/**
* Converts the arguments of a WebGL function to a string.
* Attempts to convert enum arguments to strings.
*
* @param {string} functionName the name of the WebGL function.
* @param {number} args The arguments.
* @return {string} The arguments as a string.
*/
'glFunctionArgsToString': glFunctionArgsToString,
/**
* Given a WebGL context returns a wrapped context that calls
* gl.getError after every command and calls a function if the
* result is not NO_ERROR.
*
* You can supply your own function if you want. For example, if you'd like
* an exception thrown on any GL error you could do this
*
* function throwOnGLError(err, funcName, args) {
* throw WebGLDebugUtils.glEnumToString(err) +
* " was caused by call to " + funcName;
* };
*
* ctx = WebGLDebugUtils.makeDebugContext(
* canvas.getContext("webgl"), throwOnGLError);
*
* @param {!WebGLRenderingContext} ctx The webgl context to wrap.
* @param {!function(err, funcName, args): void} opt_onErrorFunc The function
* to call when gl.getError returns an error. If not specified the default
* function calls console.log with a message.
* @param {!function(funcName, args): void} opt_onFunc The
* function to call when each webgl function is called. You
* can use this to log all calls for example.
*/
'makeDebugContext': makeDebugContext,
/**
* Given a canvas element returns a wrapped canvas element that will
* simulate lost context. The canvas returned adds the following functions.
*
* loseContext:
* simulates a lost context event.
*
* restoreContext:
* simulates the context being restored.
*
* lostContextInNCalls:
* loses the context after N gl calls.
*
* getNumCalls:
* tells you how many gl calls there have been so far.
*
* setRestoreTimeout:
* sets the number of milliseconds until the context is restored
* after it has been lost. Defaults to 0. Pass -1 to prevent
* automatic restoring.
*
* @param {!Canvas} canvas The canvas element to wrap.
*/
'makeLostContextSimulatingCanvas': makeLostContextSimulatingCanvas,
/**
* Resets a context to the initial state.
* @param {!WebGLRenderingContext} ctx The webgl context to
* reset.
*/
'resetToInitialState': resetToInitialState
};
}();
/**
* @class Generic map of IDs to items - can generate own IDs or accept given IDs. IDs should be strings in order to not
* clash with internally generated IDs, which are numbers.
* @private
*/
var SceneJS_Map = function(items, _baseId) {
/**
* @property Items in this map
*/
this.items = items || [];
var baseId = _baseId || 0;
var lastUniqueId = baseId + 1;
/**
* Adds an item to the map and returns the ID of the item in the map. If an ID is given, the item is
* mapped to that ID. Otherwise, the map automatically generates the ID and maps to that.
*
* id = myMap.addItem("foo") // ID internally generated
*
* id = myMap.addItem("foo", "bar") // ID is "foo"
*
*/
this.addItem = function() {
var item;
if (arguments.length == 2) {
var id = arguments[0];
item = arguments[1];
if (this.items[id]) { // Won't happen if given ID is string
throw SceneJS_error.fatalError(SceneJS.errors.ID_CLASH, "ID clash: '" + id + "'");
}
this.items[id] = item;
return id;
} else {
while (true) {
item = arguments[0];
var findId = lastUniqueId++;
if (!this.items[findId]) {
this.items[findId] = item;
return findId;
}
}
}
};
/**
* Removes the item of the given ID from the map
*/
this.removeItem = function(id) {
delete this.items[id];
};
};/**
* The SceneJS object.
*/
var SceneJS = new (function () {
/**
* This SceneJS version
*/
this.VERSION = '3.2';
this._baseStateId = 0;
// Pub/sub support
this._handleMap = new SceneJS_Map(); // Subscription handle pool
this._topicSubs = {}; // A [handle -> callback] map for each topic name
this._handleTopics = {}; // Maps handles to topic names
this._topicPubs = {}; // Maps topics to publications
/**
* @property {SceneJS_Engine} Engines currently in existance
*/
this._engines = {};
this._engineIds = new SceneJS_Map();
/**
* Publishes to a topic.
*
* Immediately notifies existing subscriptions to that topic, retains the publication to give to
* any subsequent notifications on that topic as they are made.
*
* @param {String} topic Publication topic
* @param {Object} pub The publication
* @param {Boolean} [forget] When true, the publication will be sent to subscribers then forgotten, so that any
* subsequent subscribers will not receive it
* @private
*/
this.publish = function (topic, pub, forget) {
if (!forget) {
this._topicPubs[topic] = pub; // Save notification
}
var subsForTopic = this._topicSubs[topic];
if (subsForTopic) { // Notify subscriptions
for (var handle in subsForTopic) {
if (subsForTopic.hasOwnProperty(handle)) {
subsForTopic[handle].call(this, pub);
}
}
}
};
/**