Function OESVertexArrayObject

docs/app/js/sanddance-app.js:59185–59269

(gl)

    ].join(":");
};
var OESVertexArrayObject = function OESVertexArrayObject(gl) {
    var self = this;
    this.gl = gl;
    wrapGLError(gl);
    var original = this.original = {
        getParameter: gl.getParameter,
        enableVertexAttribArray: gl.enableVertexAttribArray,
        disableVertexAttribArray: gl.disableVertexAttribArray,
        bindBuffer: gl.bindBuffer,
        getVertexAttrib: gl.getVertexAttrib,
        vertexAttribPointer: gl.vertexAttribPointer
    };
    gl.getParameter = function getParameter(pname) {
        if (pname === self.VERTEX_ARRAY_BINDING_OES) {
            if (self.currentVertexArrayObject === self.defaultVertexArrayObject) return null;
            return self.currentVertexArrayObject;
        }
        return original.getParameter.apply(this, arguments);
    };
    gl.enableVertexAttribArray = function enableVertexAttribArray(index) {
        var vao = self.currentVertexArrayObject;
        vao.maxAttrib = Math.max(vao.maxAttrib, index);
        var attrib = vao.attribs[index];
        attrib.enabled = true;
        return original.enableVertexAttribArray.apply(this, arguments);
    };
    gl.disableVertexAttribArray = function disableVertexAttribArray(index) {
        var vao = self.currentVertexArrayObject;
        vao.maxAttrib = Math.max(vao.maxAttrib, index);
        var attrib = vao.attribs[index];
        attrib.enabled = false;
        return original.disableVertexAttribArray.apply(this, arguments);
    };
    gl.bindBuffer = function bindBuffer(target, buffer) {
        switch(target){
            case 34962:
                self.currentArrayBuffer = buffer;
                break;
            case 34963:
                self.currentVertexArrayObject.elementArrayBuffer = buffer;
                break;
            default:
        }
        return original.bindBuffer.apply(this, arguments);
    };
    gl.getVertexAttrib = function getVertexAttrib(index, pname) {
        var vao = self.currentVertexArrayObject;
        var attrib = vao.attribs[index];
        switch(pname){
            case 34975:
                return attrib.buffer;
            case 34338:
                return attrib.enabled;
            case 34339:
                return attrib.size;
            case 34340:
                return attrib.stride;
            case 34341: