cesiumDemo/Source/Renderer/Sampler.js

import Check from '../Core/Check.js';
import defaultValue from '../Core/defaultValue.js';
import defined from '../Core/defined.js';
import defineProperties from '../Core/defineProperties.js';
import DeveloperError from '../Core/DeveloperError.js';
import TextureMagnificationFilter from './TextureMagnificationFilter.js';
import TextureMinificationFilter from './TextureMinificationFilter.js';
import TextureWrap from './TextureWrap.js';

    /**
     * @private
     */
    function Sampler(options) {
        options = defaultValue(options, defaultValue.EMPTY_OBJECT);

        var wrapS = defaultValue(options.wrapS, TextureWrap.CLAMP_TO_EDGE);
        var wrapT = defaultValue(options.wrapT, TextureWrap.CLAMP_TO_EDGE);
        var minificationFilter = defaultValue(options.minificationFilter, TextureMinificationFilter.LINEAR);
        var magnificationFilter = defaultValue(options.magnificationFilter, TextureMagnificationFilter.LINEAR);
        var maximumAnisotropy = (defined(options.maximumAnisotropy)) ? options.maximumAnisotropy : 1.0;

        //>>includeStart('debug', pragmas.debug);
        if (!TextureWrap.validate(wrapS)) {
            throw new DeveloperError('Invalid sampler.wrapS.');
        }

        if (!TextureWrap.validate(wrapT)) {
            throw new DeveloperError('Invalid sampler.wrapT.');
        }

        if (!TextureMinificationFilter.validate(minificationFilter)) {
            throw new DeveloperError('Invalid sampler.minificationFilter.');
        }

        if (!TextureMagnificationFilter.validate(magnificationFilter)) {
            throw new DeveloperError('Invalid sampler.magnificationFilter.');
        }

        Check.typeOf.number.greaterThanOrEquals('maximumAnisotropy', maximumAnisotropy, 1.0);
        //>>includeEnd('debug');

        this._wrapS = wrapS;
        this._wrapT = wrapT;
        this._minificationFilter = minificationFilter;
        this._magnificationFilter = magnificationFilter;
        this._maximumAnisotropy = maximumAnisotropy;
    }

    defineProperties(Sampler.prototype, {
        wrapS : {
            get : function() {
                return this._wrapS;
            }
        },
        wrapT : {
            get : function() {
                return this._wrapT;
            }
        },
        minificationFilter : {
            get : function() {
                return this._minificationFilter;
            }
        },
        magnificationFilter : {
            get : function() {
                return this._magnificationFilter;
            }
        },
        maximumAnisotropy : {
            get : function() {
                return this._maximumAnisotropy;
            }
        }
    });

    Sampler.equals = function(left, right) {
        return (left === right) ||
               ((defined(left)) &&
                (defined(right)) &&
                (left._wrapS === right._wrapS) &&
                (left._wrapT === right._wrapT) &&
                (left._minificationFilter === right._minificationFilter) &&
                (left._magnificationFilter === right._magnificationFilter) &&
                (left._maximumAnisotropy === right._maximumAnisotropy));
    };
export default Sampler;