cocos-enhance-kit/jsb-adapter/engine/scene/mesh-buffer.js

/****************************************************************************
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://www.cocos.com/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated engine source code (the "Software"), a limited,
 worldwide, royalty-free, non-assignable, revocable and non-exclusive license
 to use Cocos Creator solely to develop games on your target platforms. You shall
 not use Cocos Creator software for developing other software or tools that's
 used for developing games. You are not granted to publish, distribute,
 sublicense, and/or sell copies of Cocos Creator.

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 Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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(function(){
    if (!cc.MeshBuffer) return;
    let MeshBuffer = cc.MeshBuffer.prototype;

    MeshBuffer.init = function (batcher, vertexFormat) {
        this.byteOffset = 0;
        this.indiceOffset = 0;
        this.vertexOffset = 0;

        this._vertexFormat = vertexFormat;
        this._vertexBytes = this._vertexFormat._bytes;

        this._vDatas = [];
        this._uintVDatas = [];
        this._iDatas = [];
        this._arrOffset = 0;

        this._vData = null;
        this._uintVData = null;
        this._iData = null;

        this._initVDataCount = 256 * vertexFormat._bytes;// actually 256 * 4 * (vertexFormat._bytes / 4)
        this._initIDataCount = 256 * 6;
        
        this._offsetInfo = {
            byteOffset : 0,
            vertexOffset : 0,
            indiceOffset : 0
        };

        this._renderDataList = new renderer.RenderDataList();
        this._reallocBuffer();
    };

    MeshBuffer.setNativeAssembler = function(assembler) {
        if (assembler !== this._nativeAssembler) {
            this._nativeAssembler = assembler;
            assembler.setRenderDataList(this._renderDataList);
        }
    };

    MeshBuffer._updateVIDatas = function() {
        let offset = this._arrOffset;
        this._vDatas[offset] = this._vData;
        this._uintVDatas[offset] = this._uintVData;
        this._iDatas[offset] = this._iData;
        this._renderDataList.updateMesh(offset, this._vData, this._iData);
    };

    MeshBuffer.getNativeAssembler = function() {
        return this._nativeAssembler;
    };

    MeshBuffer.getCurMeshIndex = function() {
        return this._arrOffset;
    };

    MeshBuffer.uploadData = function() {};

    MeshBuffer.switchBuffer = function() {
        let offset = ++this._arrOffset;

        this.byteOffset = 0;
        this.vertexOffset = 0;
        this.indiceOffset = 0;

        if (offset < this._vDatas.length) {
            this._vData = this._vDatas[offset];
            this._uintVData = this._uintVDatas[offset];
            this._iData = this._iDatas[offset];
        } else {
            this._reallocBuffer();
        }
    };

    MeshBuffer.checkAndSwitchBuffer = function(vertexCount) {
        if (this.vertexOffset + vertexCount > 65535) {
            this.switchBuffer();
            if (!this._nativeAssembler) return;
            this._nativeAssembler.updateIADatas && this._nativeAssembler.updateIADatas(this._arrOffset, this._arrOffset);
        }
    };

    MeshBuffer.used = function(vertexCount, indiceCount) {
        if (!this._nativeAssembler) return;
        this._nativeAssembler.updateVerticesRange(this._arrOffset, 0, vertexCount);
        this._nativeAssembler.updateIndicesRange(this._arrOffset, 0, indiceCount);
    };

    MeshBuffer.request = function(vertexCount, indiceCount) {
        this.requestStatic(vertexCount, indiceCount);
        return this._offsetInfo;
    };

    MeshBuffer._reallocBuffer = function() {
        this._reallocVData(true);
        this._reallocIData(true);
        this._updateVIDatas();
    };

    MeshBuffer._reallocVData = function(copyOldData) {
        let oldVData;
        if (this._vData) {
            oldVData = new Uint8Array(this._vData.buffer);
        }

        this._vData = new Float32Array(this._initVDataCount);
        this._uintVData = new Uint32Array(this._vData.buffer);

        let newData = new Uint8Array(this._uintVData.buffer);

        if (oldVData && copyOldData) {
            for (let i = 0, l = oldVData.length; i < l; i++) {
                newData[i] = oldVData[i];
            }
        }
    };

    MeshBuffer._reallocIData = function(copyOldData) {
        let oldIData = this._iData;

        this._iData = new Uint16Array(this._initIDataCount);

        if (oldIData && copyOldData) {
            let iData = this._iData;
            for (let i = 0, l = oldIData.length; i < l; i++) {
                iData[i] = oldIData[i];
            }
        }
    };

    MeshBuffer.reset = function() {
        this._arrOffset = 0;
        this._vData = this._vDatas[0];
        this._uintVData = this._uintVDatas[0];
        this._iData = this._iDatas[0];

        this.byteOffset = 0;
        this.indiceOffset = 0;
        this.vertexOffset = 0;

        if (!this._nativeAssembler) return;

        for (let i = 0, len = this._vDatas.length; i < len; i++) {
            this._nativeAssembler.updateVerticesRange(i, 0, 0);
            this._nativeAssembler.updateIndicesRange(i, 0, 0);
        }
    };

    MeshBuffer.destroy = function() {
        this.reset();
    };
})();