# all files / src/core/ GLInfo.js

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     var EXTENSION_LIST = [
        'OES_texture_float',
        'OES_texture_half_float',
        'OES_texture_float_linear',
        'OES_texture_half_float_linear',
        'OES_standard_derivatives',
        'OES_vertex_array_object',
        'OES_element_index_uint',
        'WEBGL_compressed_texture_s3tc',
        'WEBGL_depth_texture',
        'EXT_texture_filter_anisotropic',
        'EXT_shader_texture_lod',
        'WEBGL_draw_buffers',
        'EXT_frag_depth',
        'EXT_sRGB'
    ];

    var PARAMETER_NAMES = [
        'MAX_TEXTURE_SIZE',
        'MAX_CUBE_MAP_TEXTURE_SIZE'
    ];

    function GLInfo(_gl) {
        var extensions = {};
        var parameters = {};

        // Get webgl extension
        for (var i = 0; i < EXTENSION_LIST.length; i++) {
            var extName = EXTENSION_LIST[i];
            createExtension(extName);
        }
        // Get parameters
        for (var i = 0; i < PARAMETER_NAMES.length; i++) {
            var name = PARAMETER_NAMES[i];
            parameters[name] = _gl.getParameter(_gl[name]);
        }

        this.getExtension = function (name) {
            if (!(name in extensions)) {
                createExtension(name);
            }
            return extensions[name];
        };

        this.getParameter = function (name) {
            return parameters[name];
        };

        function createExtension(name) {
            var ext = _gl.getExtension(name);
            if (!ext) {
                ext = _gl.getExtension('MOZ_' + name);
            }
            if (!ext) {
                ext = _gl.getExtension('WEBKIT_' + name);
            }
            extensions[name] = ext;
        }
    }

    export default GLInfo;