Function wrapGLError

docs/app/js/sanddance-app.js:59137–59151

(gl)

    if (opt_msg !== undefined) error(opt_msg);
}
function wrapGLError(gl) {
    var f = gl.getError;
    gl.getError = function getError() {
        var err;
        do {
            err = f.apply(gl);
            if (err !== 0) glErrorShadow[err] = true;
        }while (err !== 0);
        for(err in glErrorShadow)if (glErrorShadow[err]) {
            delete glErrorShadow[err];
            return parseInt(err, 10);
        }
        return 0;
    };
}
var WebGLVertexArrayObjectOES = function WebGLVertexArrayObjectOES1(ext) {
    var gl = ext.gl;
    this.ext = ext;