tv_xiaoyouxi/games/symdsb/frameworks/cocos2d-html5/CCTextureAtlas.js

/****************************************************************************
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2014 Chukong Technologies Inc.

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/**
 * <p>A class that implements a Texture Atlas. <br />
 * Supported features: <br />
 * The atlas file can be a PNG, JPG. <br />
 * Quads can be updated in runtime <br />
 * Quads can be added in runtime <br />
 * Quads can be removed in runtime <br />
 * Quads can be re-ordered in runtime <br />
 * The TextureAtlas capacity can be increased or decreased in runtime.</p>
 * @class
 * @extends cc.Class
 *
 * @property {Boolean}  dirty           - Indicates whether or not the array buffer of the VBO needs to be updated.
 * @property {Image}    texture         - Image texture for cc.TextureAtlas.
 * @property {Number}   capacity        - <@readonly> Quantity of quads that can be stored with the current texture atlas size.
 * @property {Number}   totalQuads      - <@readonly> Quantity of quads that are going to be drawn.
 * @property {Array}    quads           - <@readonly> Quads that are going to be rendered
 */
cc.TextureAtlas = cc.Class.extend(/** @lends cc.TextureAtlas# */{
    dirty: false,
    texture: null,

    _indices: null,
    //0: vertex  1: indices
    _buffersVBO: null,
    _capacity: 0,

    _quads: null,
    _quadsArrayBuffer: null,
    _quadsWebBuffer: null,
    _quadsReader: null,

    /**
     * <p>Creates a TextureAtlas with an filename and with an initial capacity for Quads. <br />
     * The TextureAtlas capacity can be increased in runtime. </p>
     * Constructor of cc.TextureAtlas
     * @param {String|cc.Texture2D} fileName
     * @param {Number} capacity
     * @example
     * 1.
     * //creates a TextureAtlas with  filename
     * var textureAtlas = new cc.TextureAtlas("res/hello.png", 3);
     * 2.
     * //creates a TextureAtlas with texture
     * var texture = cc.textureCache.addImage("hello.png");
     * var textureAtlas = new cc.TextureAtlas(texture, 3);
     */
    ctor: function (fileName, capacity) {
        this._buffersVBO = [];

        if (typeof(fileName) == "string") {
            this.initWithFile(fileName, capacity);
        }
        else if (fileName instanceof cc.Texture2D) {
            this.initWithTexture(fileName, capacity);
        }
    },

    /**
     * Quantity of quads that are going to be drawn.
     * @return {Number}
     */
    getTotalQuads: function () {
        //return this._quads.length;
        return this._totalQuads;
    },

    /**
     * Quantity of quads that can be stored with the current texture atlas size
     * @return {Number}
     */
    getCapacity: function () {
        return this._capacity;
    },

    /**
     * Texture of the texture atlas
     * @return {Image}
     */
    getTexture: function () {
        return this.texture;
    },

    /**
     * @param {Image} texture
     */
    setTexture: function (texture) {
        this.texture = texture;
    },

    /**
     * specify if the array buffer of the VBO needs to be updated
     * @param {Boolean} dirty
     */
    setDirty: function (dirty) {
        this.dirty = dirty;
    },

    /**
     * whether or not the array buffer of the VBO needs to be updated
     * @returns {boolean}
     */
    isDirty: function () {
        return this.dirty;
    },

    /**
     * Quads that are going to be rendered
     * @return {Array}
     */
    getQuads: function () {
        return this._quads;
    },

    /**
     * @param {Array} quads
     */
    setQuads: function (quads) {
        this._quads = quads;
        //TODO need re-binding
    },

    _copyQuadsToTextureAtlas: function (quads, index) {
        if (!quads)
            return;

        for (var i = 0; i < quads.length; i++)
            this._setQuadToArray(quads[i], index + i);
    },

    _setQuadToArray: function (quad, index) {
        var locQuads = this._quads;
        if (!locQuads[index]) {
            locQuads[index] = new cc.V3F_C4B_T2F_Quad(quad.tl, quad.bl, quad.tr, quad.br, this._quadsArrayBuffer, index * cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT);
            return;
        }
        locQuads[index].bl = quad.bl;
        locQuads[index].br = quad.br;
        locQuads[index].tl = quad.tl;
        locQuads[index].tr = quad.tr;
    },

    /**
     * Description
     * @return {String}
     */
    description: function () {
        return '<cc.TextureAtlas | totalQuads =' + this._totalQuads + '>';
    },

    _setupIndices: function () {
        if (this._capacity === 0)
            return;
        var locIndices = this._indices, locCapacity = this._capacity;
        for (var i = 0; i < locCapacity; i++) {
            if (cc.TEXTURE_ATLAS_USE_TRIANGLE_STRIP) {
                locIndices[i * 6 + 0] = i * 4 + 0;
                locIndices[i * 6 + 1] = i * 4 + 0;
                locIndices[i * 6 + 2] = i * 4 + 2;
                locIndices[i * 6 + 3] = i * 4 + 1;
                locIndices[i * 6 + 4] = i * 4 + 3;
                locIndices[i * 6 + 5] = i * 4 + 3;
            } else {
                locIndices[i * 6 + 0] = i * 4 + 0;
                locIndices[i * 6 + 1] = i * 4 + 1;
                locIndices[i * 6 + 2] = i * 4 + 2;

                // inverted index. issue #179
                locIndices[i * 6 + 3] = i * 4 + 3;
                locIndices[i * 6 + 4] = i * 4 + 2;
                locIndices[i * 6 + 5] = i * 4 + 1;
            }
        }
    },

    _setupVBO: function () {
        var gl = cc._renderContext;
        //create WebGLBuffer
        this._buffersVBO[0] = gl.createBuffer();
        this._buffersVBO[1] = gl.createBuffer();

        this._quadsWebBuffer = gl.createBuffer();
        this._mapBuffers();
    },

    _mapBuffers: function () {
        var gl = cc._renderContext;

        gl.bindBuffer(gl.ARRAY_BUFFER, this._quadsWebBuffer);
        gl.bufferData(gl.ARRAY_BUFFER, this._quadsArrayBuffer, gl.DYNAMIC_DRAW);

        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._buffersVBO[1]);
        gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this._indices, gl.STATIC_DRAW);
    },

    /**
     * <p>Initializes a TextureAtlas with a filename and with a certain capacity for Quads.<br />
     * The TextureAtlas capacity can be increased in runtime.<br />
     * WARNING: Do not reinitialize the TextureAtlas because it will leak memory. </p>
     * @param {String} file
     * @param {Number} capacity
     * @return {Boolean}
     * @example
     * //example
     * var textureAtlas = new cc.TextureAtlas();
     * textureAtlas.initWithTexture("hello.png", 3);
     */
    initWithFile: function (file, capacity) {
        // retained in property
        var texture = cc.textureCache.addImage(file);
        if (texture)
            return this.initWithTexture(texture, capacity);
        else {
            cc.log(cc._LogInfos.TextureAtlas_initWithFile, file);
            return false;
        }
    },

    /**
     * <p>Initializes a TextureAtlas with a previously initialized Texture2D object, and<br />
     * with an initial capacity for Quads.<br />
     * The TextureAtlas capacity can be increased in runtime.<br />
     * WARNING: Do not reinitialize the TextureAtlas because it will leak memory</p>
     * @param {Image} texture
     * @param {Number} capacity
     * @return {Boolean}
     * @example
     * //example
     * var texture = cc.textureCache.addImage("hello.png");
     * var textureAtlas = new cc.TextureAtlas();
     * textureAtlas.initWithTexture(texture, 3);
     */
    initWithTexture: function (texture, capacity) {

        cc.assert(texture, cc._LogInfos.TextureAtlas_initWithTexture);

        capacity = 0 | (capacity);
        this._capacity = capacity;
        this._totalQuads = 0;

        // retained in property
        this.texture = texture;

        // Re-initialization is not allowed
        this._quads = [];
        this._indices = new Uint16Array(capacity * 6);
        var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        this._quadsArrayBuffer = new ArrayBuffer(quadSize * capacity);
        this._quadsReader = new Uint8Array(this._quadsArrayBuffer);

        if (!( this._quads && this._indices) && capacity > 0)
            return false;

        var locQuads = this._quads;
        for (var i = 0; i < capacity; i++)
            locQuads[i] = new cc.V3F_C4B_T2F_Quad(null, null, null, null, this._quadsArrayBuffer, i * quadSize);

        this._setupIndices();
        this._setupVBO();
        this.dirty = true;
        return true;
    },

    /**
     * <p>Updates a Quad (texture, vertex and color) at a certain index <br />
     * index must be between 0 and the atlas capacity - 1 </p>
     * @param {cc.V3F_C4B_T2F_Quad} quad
     * @param {Number} index
     */
    updateQuad: function (quad, index) {

        cc.assert(quad, cc._LogInfos.TextureAtlas_updateQuad);

        cc.assert(index >= 0 && index < this._capacity, cc._LogInfos.TextureAtlas_updateQuad_2);

        this._totalQuads = Math.max(index + 1, this._totalQuads);
        this._setQuadToArray(quad, index);
        this.dirty = true;
    },

    /**
     * <p>Inserts a Quad (texture, vertex and color) at a certain index<br />
     * index must be between 0 and the atlas capacity - 1 </p>
     * @param {cc.V3F_C4B_T2F_Quad} quad
     * @param {Number} index
     */
    insertQuad: function (quad, index) {

        cc.assert(index < this._capacity, cc._LogInfos.TextureAtlas_insertQuad_2);

        this._totalQuads++;
        if (this._totalQuads > this._capacity) {
            cc.log(cc._LogInfos.TextureAtlas_insertQuad);
            return;
        }
        var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        // issue #575. index can be > totalQuads
        var remaining = (this._totalQuads - 1) - index;
        var startOffset = index * quadSize;
        var moveLength = remaining * quadSize;
        this._quads[this._totalQuads - 1] = new cc.V3F_C4B_T2F_Quad(null, null, null, null, this._quadsArrayBuffer, (this._totalQuads - 1) * quadSize);
        this._quadsReader.set(this._quadsReader.subarray(startOffset, startOffset + moveLength), startOffset + quadSize);

        this._setQuadToArray(quad, index);
        this.dirty = true;
    },

    /**
     * <p>
     *      Inserts a c array of quads at a given index                                           <br />
     *      index must be between 0 and the atlas capacity - 1                                    <br />
     *      this method doesn't enlarge the array when amount + index > totalQuads                <br />
     * </p>
     * @param {Array} quads
     * @param {Number} index
     * @param {Number} amount
     */
    insertQuads: function (quads, index, amount) {
        amount = amount || quads.length;

        cc.assert((index + amount) <= this._capacity, cc._LogInfos.TextureAtlas_insertQuads);

        var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        this._totalQuads += amount;
        if (this._totalQuads > this._capacity) {
            cc.log(cc._LogInfos.TextureAtlas_insertQuad);
            return;
        }

        // issue #575. index can be > totalQuads
        var remaining = (this._totalQuads - 1) - index - amount;
        var startOffset = index * quadSize;
        var moveLength = remaining * quadSize;
        var lastIndex = (this._totalQuads - 1) - amount;

        var i;
        for (i = 0; i < amount; i++)
            this._quads[lastIndex + i] = new cc.V3F_C4B_T2F_Quad(null, null, null, null, this._quadsArrayBuffer, (this._totalQuads - 1) * quadSize);
        this._quadsReader.set(this._quadsReader.subarray(startOffset, startOffset + moveLength), startOffset + quadSize * amount);
        for (i = 0; i < amount; i++)
            this._setQuadToArray(quads[i], index + i);

        this.dirty = true;
    },

    /**
     * <p>Removes the quad that is located at a certain index and inserts it at a new index <br />
     * This operation is faster than removing and inserting in a quad in 2 different steps</p>
     * @param {Number} fromIndex
     * @param {Number} newIndex
     */
    insertQuadFromIndex: function (fromIndex, newIndex) {
        if (fromIndex === newIndex)
            return;

        cc.assert(newIndex >= 0 || newIndex < this._totalQuads, cc._LogInfos.TextureAtlas_insertQuadFromIndex);

        cc.assert(fromIndex >= 0 || fromIndex < this._totalQuads, cc._LogInfos.TextureAtlas_insertQuadFromIndex_2);

        var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        var locQuadsReader = this._quadsReader;
        var sourceArr = locQuadsReader.subarray(fromIndex * quadSize, quadSize);
        var startOffset, moveLength;
        if (fromIndex > newIndex) {
            startOffset = newIndex * quadSize;
            moveLength = (fromIndex - newIndex) * quadSize;
            locQuadsReader.set(locQuadsReader.subarray(startOffset, startOffset + moveLength), startOffset + quadSize);
            locQuadsReader.set(sourceArr, startOffset);
        } else {
            startOffset = (fromIndex + 1) * quadSize;
            moveLength = (newIndex - fromIndex) * quadSize;
            locQuadsReader.set(locQuadsReader.subarray(startOffset, startOffset + moveLength), startOffset - quadSize);
            locQuadsReader.set(sourceArr, newIndex * quadSize);
        }
        this.dirty = true;
    },

    /**
     * <p>Removes a quad at a given index number.<br />
     * The capacity remains the same, but the total number of quads to be drawn is reduced in 1 </p>
     * @param {Number} index
     */
    removeQuadAtIndex: function (index) {

        cc.assert(index < this._totalQuads, cc._LogInfos.TextureAtlas_removeQuadAtIndex);

        var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        this._totalQuads--;
        this._quads.length = this._totalQuads;
        if (index !== this._totalQuads) {
            //move data
            var startOffset = (index + 1) * quadSize;
            var moveLength = (this._totalQuads - index) * quadSize;
            this._quadsReader.set(this._quadsReader.subarray(startOffset, startOffset + moveLength), startOffset - quadSize);
        }
        this.dirty = true;
    },

    /**
     * Removes a given number of quads at a given index
     * @param {Number} index
     * @param {Number} amount
     */
    removeQuadsAtIndex: function (index, amount) {

        cc.assert(index + amount <= this._totalQuads, cc._LogInfos.TextureAtlas_removeQuadsAtIndex);

        this._totalQuads -= amount;

        if (index !== this._totalQuads) {
            //move data
            var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
            var srcOffset = (index + amount) * quadSize;
            var moveLength = (this._totalQuads - index) * quadSize;
            var dstOffset = index * quadSize;
            this._quadsReader.set(this._quadsReader.subarray(srcOffset, srcOffset + moveLength), dstOffset);
        }
        this.dirty = true;
    },

    /**
     * <p>Removes all Quads. <br />
     * The TextureAtlas capacity remains untouched. No memory is freed.<br />
     * The total number of quads to be drawn will be 0</p>
     */
    removeAllQuads: function () {
        this._quads.length = 0;
        this._totalQuads = 0;
    },

    _setDirty: function (dirty) {
        this.dirty = dirty;
    },

    /**
     * <p>Resize the capacity of the CCTextureAtlas.<br />
     * The new capacity can be lower or higher than the current one<br />
     * It returns YES if the resize was successful. <br />
     * If it fails to resize the capacity it will return NO with a new capacity of 0. <br />
     * no used for js</p>
     * @param {Number} newCapacity
     * @return {Boolean}
     */
    resizeCapacity: function (newCapacity) {
        if (newCapacity == this._capacity)
            return true;

        var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        var oldCapacity = this._capacity;
        // update capacity and totolQuads
        this._totalQuads = Math.min(this._totalQuads, newCapacity);
        this._capacity = 0 | newCapacity;
        var i, capacity = this._capacity, locTotalQuads = this._totalQuads;

        if (this._quads == null) {
            this._quads = [];
            this._quadsArrayBuffer = new ArrayBuffer(quadSize * capacity);
            this._quadsReader = new Uint8Array(this._quadsArrayBuffer);
            for (i = 0; i < capacity; i++)
                this._quads = new cc.V3F_C4B_T2F_Quad(null, null, null, null, this._quadsArrayBuffer, i * quadSize);
        } else {
            var newQuads, newArrayBuffer, quads = this._quads;
            if (capacity > oldCapacity) {
                newQuads = [];
                newArrayBuffer = new ArrayBuffer(quadSize * capacity);
                for (i = 0; i < locTotalQuads; i++) {
                    newQuads[i] = new cc.V3F_C4B_T2F_Quad(quads[i].tl, quads[i].bl, quads[i].tr, quads[i].br,
                        newArrayBuffer, i * quadSize);
                }
                for (; i < capacity; i++)
                    newQuads[i] = new cc.V3F_C4B_T2F_Quad(null, null, null, null, newArrayBuffer, i * quadSize);

                this._quadsReader = new Uint8Array(newArrayBuffer);
                this._quads = newQuads;
                this._quadsArrayBuffer = newArrayBuffer;
            } else {
                var count = Math.max(locTotalQuads, capacity);
                newQuads = [];
                newArrayBuffer = new ArrayBuffer(quadSize * capacity);
                for (i = 0; i < count; i++) {
                    newQuads[i] = new cc.V3F_C4B_T2F_Quad(quads[i].tl, quads[i].bl, quads[i].tr, quads[i].br,
                        newArrayBuffer, i * quadSize);
                }
                this._quadsReader = new Uint8Array(newArrayBuffer);
                this._quads = newQuads;
                this._quadsArrayBuffer = newArrayBuffer;
            }
        }

        if (this._indices == null) {
            this._indices = new Uint16Array(capacity * 6);
        } else {
            if (capacity > oldCapacity) {
                var tempIndices = new Uint16Array(capacity * 6);
                tempIndices.set(this._indices, 0);
                this._indices = tempIndices;
            } else {
                this._indices = this._indices.subarray(0, capacity * 6);
            }
        }

        this._setupIndices();
        this._mapBuffers();
        this.dirty = true;
        return true;
    },

    /**
     * Used internally by CCParticleBatchNode                                    <br/>
     * don't use this unless you know what you're doing
     * @param {Number} amount
     */
    increaseTotalQuadsWith: function (amount) {
        this._totalQuads += amount;
    },

    /**
     * Moves an amount of quads from oldIndex at newIndex
     * @param {Number} oldIndex
     * @param {Number} amount
     * @param {Number} newIndex
     */
    moveQuadsFromIndex: function (oldIndex, amount, newIndex) {
        if (newIndex === undefined) {
            newIndex = amount;
            amount = this._totalQuads - oldIndex;

            cc.assert((newIndex + (this._totalQuads - oldIndex)) <= this._capacity, cc._LogInfos.TextureAtlas_moveQuadsFromIndex);

            if (amount === 0)
                return;
        } else {

            cc.assert((newIndex + amount) <= this._totalQuads, cc._LogInfos.TextureAtlas_moveQuadsFromIndex_2);

            cc.assert(oldIndex < this._totalQuads, cc._LogInfos.TextureAtlas_moveQuadsFromIndex_3);

            if (oldIndex == newIndex)
                return;
        }

        var quadSize = cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        var srcOffset = oldIndex * quadSize;
        var srcLength = amount * quadSize;
        var locQuadsReader = this._quadsReader;
        var sourceArr = locQuadsReader.subarray(srcOffset, srcOffset + srcLength);
        var dstOffset = newIndex * quadSize;
        var moveLength, moveStart;
        if (newIndex < oldIndex) {
            moveLength = (oldIndex - newIndex) * quadSize;
            moveStart = newIndex * quadSize;
            locQuadsReader.set(locQuadsReader.subarray(moveStart, moveStart + moveLength), moveStart + srcLength)
        } else {
            moveLength = (newIndex - oldIndex) * quadSize;
            moveStart = (oldIndex + amount) * quadSize;
            locQuadsReader.set(locQuadsReader.subarray(moveStart, moveStart + moveLength), srcOffset);
        }
        locQuadsReader.set(sourceArr, dstOffset);
        this.dirty = true;
    },

    /**
     * Ensures that after a realloc quads are still empty                                <br/>
     * Used internally by CCParticleBatchNode
     * @param {Number} index
     * @param {Number} amount
     */
    fillWithEmptyQuadsFromIndex: function (index, amount) {
        var count = amount * cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT;
        var clearReader = new Uint8Array(this._quadsArrayBuffer, index * cc.V3F_C4B_T2F_Quad.BYTES_PER_ELEMENT, count);
        for (var i = 0; i < count; i++)
            clearReader[i] = 0;
    },

    // TextureAtlas - Drawing

    /**
     * Draws all the Atlas's Quads
     */
    drawQuads: function () {
        this.drawNumberOfQuads(this._totalQuads, 0);
    },

    _releaseBuffer: function () {
        var gl = cc._renderContext;
        if (this._buffersVBO) {
            if (this._buffersVBO[0])
                gl.deleteBuffer(this._buffersVBO[0]);
            if (this._buffersVBO[1])
                gl.deleteBuffer(this._buffersVBO[1])
        }
        if (this._quadsWebBuffer)
            gl.deleteBuffer(this._quadsWebBuffer);
    }
});

var _p = cc.TextureAtlas.prototype;

// Extended properties
/** @expose */
_p.totalQuads;
cc.defineGetterSetter(_p, "totalQuads", _p.getTotalQuads);
/** @expose */
_p.capacity;
cc.defineGetterSetter(_p, "capacity", _p.getCapacity);
/** @expose */
_p.quads;
cc.defineGetterSetter(_p, "quads", _p.getQuads, _p.setQuads);

/**
 * <p>Creates a TextureAtlas with an filename and with an initial capacity for Quads. <br />
 * The TextureAtlas capacity can be increased in runtime. </p>
 * @deprecated since v3.0, please use new cc.TextureAtlas(fileName, capacity) instead
 * @param {String|cc.Texture2D} fileName
 * @param {Number} capacity
 * @return {cc.TextureAtlas|Null}
 * @example
 * 1.
 * //creates a TextureAtlas with  filename
 * var textureAtlas = cc.TextureAtlas.create("res/hello.png", 3);
 * 2.
 * //creates a TextureAtlas with texture
 * var texture = cc.textureCache.addImage("hello.png");
 * var textureAtlas = cc.TextureAtlas.create(texture, 3);
 */
cc.TextureAtlas.create = function (fileName, capacity) {
    return new cc.TextureAtlas(fileName, capacity);
};

/**
 * @deprecated  since v3.0, please use new cc.TextureAtlas(texture) instead
 * @function
 */
cc.TextureAtlas.createWithTexture = cc.TextureAtlas.create;

if (cc._renderType === cc._RENDER_TYPE_WEBGL) {
    cc.assert(typeof cc._tmp.WebGLTextureAtlas === "function", cc._LogInfos.MissingFile, "TexturesWebGL.js");
    cc._tmp.WebGLTextureAtlas();
    delete cc._tmp.WebGLTextureAtlas;
}

cc.assert(typeof cc._tmp.PrototypeTextureAtlas === "function", cc._LogInfos.MissingFile, "TexturesPropertyDefine.js");
cc._tmp.PrototypeTextureAtlas();
delete cc._tmp.PrototypeTextureAtlas;