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<h1 class="file-heading">File: src/pixi/display/SpriteBatch.js</h1>
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<pre class="code prettyprint linenums">
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/**
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* @author Mat Groves http://matgroves.com/
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*/
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/**
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* The SpriteBatch class is a really fast version of the DisplayObjectContainer
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* built solely for speed, so use when you need a lot of sprites or particles.
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* And it's extremely easy to use :
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var container = new PIXI.SpriteBatch();
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stage.addChild(container);
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for(var i = 0; i < 100; i++)
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{
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var sprite = new PIXI.Sprite.fromImage("myImage.png");
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container.addChild(sprite);
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}
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* And here you have a hundred sprites that will be renderer at the speed of light
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*
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* @class SpriteBatch
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* @constructor
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* @param texture {Texture}
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*/
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PIXI.SpriteBatch = function(texture)
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{
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PIXI.DisplayObjectContainer.call( this);
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this.textureThing = texture;
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this.ready = false;
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};
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PIXI.SpriteBatch.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
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PIXI.SpriteBatch.constructor = PIXI.SpriteBatch;
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/*
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* Initialises the spriteBatch
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*
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* @method initWebGL
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* @param gl {WebGLContext} the current WebGL drawing context
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*/
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PIXI.SpriteBatch.prototype.initWebGL = function(gl)
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{
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// TODO only one needed for the whole engine really?
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this.fastSpriteBatch = new PIXI.WebGLFastSpriteBatch(gl);
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this.ready = true;
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};
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/*
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* Updates the object transform for rendering
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*
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* @method updateTransform
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* @private
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*/
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PIXI.SpriteBatch.prototype.updateTransform = function()
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{
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// TODO dont need to!
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PIXI.DisplayObject.prototype.updateTransform.call( this );
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// PIXI.DisplayObjectContainer.prototype.updateTransform.call( this );
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};
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/**
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* Renders the object using the WebGL renderer
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*
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* @method _renderWebGL
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* @param renderSession {RenderSession}
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* @private
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*/
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PIXI.SpriteBatch.prototype._renderWebGL = function(renderSession)
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{
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if(!this.visible || this.alpha <= 0 || !this.children.length)return;
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if(!this.ready)this.initWebGL( renderSession.gl );
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renderSession.spriteBatch.stop();
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renderSession.shaderManager.activateShader(renderSession.shaderManager.fastShader);
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this.fastSpriteBatch.begin(this, renderSession);
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this.fastSpriteBatch.render(this);
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renderSession.shaderManager.activateShader(renderSession.shaderManager.defaultShader);
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renderSession.spriteBatch.start();
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};
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/**
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* Renders the object using the Canvas renderer
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*
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* @method _renderCanvas
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* @param renderSession {RenderSession}
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* @private
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*/
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PIXI.SpriteBatch.prototype._renderCanvas = function(renderSession)
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{
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var context = renderSession.context;
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context.globalAlpha = this.worldAlpha;
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var transform = this.worldTransform;
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// alow for trimming
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if (renderSession.roundPixels)
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{
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context.setTransform(transform.a, transform.c, transform.b, transform.d, Math.floor(transform.tx), Math.floor(transform.ty));
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}
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else
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{
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context.setTransform(transform.a, transform.c, transform.b, transform.d, transform.tx, transform.ty);
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}
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context.save();
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for (var i = 0; i < this.children.length; i++) {
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var child = this.children[i];
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var texture = child.texture;
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var frame = texture.frame;
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context.globalAlpha = this.worldAlpha * child.alpha;
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if(child.rotation % (Math.PI * 2) === 0)
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{
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// this is the fastest way to optimise! - if rotation is 0 then we can avoid any kind of setTransform call
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context.drawImage(texture.baseTexture.source,
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frame.x,
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frame.y,
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frame.width,
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frame.height,
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((child.anchor.x) * (-frame.width * child.scale.x) + child.position.x + 0.5) | 0,
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((child.anchor.y) * (-frame.height * child.scale.y) + child.position.y + 0.5) | 0,
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frame.width * child.scale.x,
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frame.height * child.scale.y);
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}
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else
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{
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PIXI.DisplayObject.prototype.updateTransform.call(child);
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transform = child.localTransform;
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if(this.rotation !== this.rotationCache)
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{
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this.rotationCache = this.rotation;
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this._sr = Math.sin(this.rotation);
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this._cr = Math.cos(this.rotation);
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}
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var a = child._cr * child.scale.x,
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b = -child._sr * child.scale.y,
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c = child._sr * child.scale.x,
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d = child._cr * child.scale.y;
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context.setTransform(a, c, b, d, child.position.x, child.position.y);
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context.drawImage(texture.baseTexture.source,
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frame.x,
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frame.y,
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frame.width,
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frame.height,
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((child.anchor.x) * (-frame.width) + 0.5) | 0,
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((child.anchor.y) * (-frame.height) + 0.5) | 0,
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frame.width,
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frame.height);
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}
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}
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context.restore();
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};
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</pre>
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