# all files / src/ createCompositor.js

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    1×

     import util from './core/util';
    import Compositor from './compositor/Compositor';
    import CompoSceneNode from './compositor/SceneNode';
    import CompoTextureNode from './compositor/TextureNode';
    import CompoFilterNode from './compositor/FilterNode';
    import Shader from './Shader';
    import Texture from './Texture';
    import Texture2D from './Texture2D';
    import TextureCube from './TextureCube';

    var shaderSourceReg = /^#source\((.*?)\)/;

    /**
     * @name clay.createCompositor
     * @function
     * @param {Object} json
     * @param {Object} [opts]
     * @return {clay.compositor.Compositor}
     */
    function createCompositor(json, opts) {
        var compositor = new Compositor();
        opts = opts || {};

        var lib = {
            textures: {},
            parameters: {}
        };
        var afterLoad = function(shaderLib, textureLib) {
            for (var i = 0; i < json.nodes.length; i++) {
                var nodeInfo = json.nodes[i];
                var node = createNode(nodeInfo, lib, opts);
                if (node) {
                    compositor.addNode(node);
                }
            }
        };

        for (var name in json.parameters) {
            var paramInfo = json.parameters[name];
            lib.parameters[name] = convertParameter(paramInfo);
        }
        // TODO load texture asynchronous
        loadTextures(json, lib, opts, function(textureLib) {
            lib.textures = textureLib;
            afterLoad();
        });

        return compositor;
    }

    function createNode(nodeInfo, lib, opts) {
        var type = nodeInfo.type || 'filter';
        var shaderSource;
        var inputs;
        var outputs;

        if (type === 'filter') {
            var shaderExp = nodeInfo.shader.trim();
            var res = shaderSourceReg.exec(shaderExp);
            if (res) {
                shaderSource = Shader.source(res[1].trim());
            }
            else if (shaderExp.charAt(0) === '#') {
                shaderSource = lib.shaders[shaderExp.substr(1)];
            }
            if (!shaderSource) {
                shaderSource = shaderExp;
            }
            if (!shaderSource) {
                return;
            }
        }

        if (nodeInfo.inputs) {
            inputs = {};
            for (var name in nodeInfo.inputs) {
                if (typeof nodeInfo.inputs[name] === 'string') {
                    inputs[name] = nodeInfo.inputs[name];
                }
                else {
                    inputs[name] = {
                        node: nodeInfo.inputs[name].node,
                        pin: nodeInfo.inputs[name].pin
                    };
                }
            }
        }
        if (nodeInfo.outputs) {
            outputs = {};
            for (var name in nodeInfo.outputs) {
                var outputInfo = nodeInfo.outputs[name];
                outputs[name] = {};
                if (outputInfo.attachment != null) {
                    outputs[name].attachment = outputInfo.attachment;
                }
                if (outputInfo.keepLastFrame != null) {
                    outputs[name].keepLastFrame = outputInfo.keepLastFrame;
                }
                if (outputInfo.outputLastFrame != null) {
                    outputs[name].outputLastFrame = outputInfo.outputLastFrame;
                }
                if (outputInfo.parameters) {
                    outputs[name].parameters = convertParameter(outputInfo.parameters);
                }
            }
        }
        var node;
        if (type === 'scene') {
            node = new CompoSceneNode({
                name: nodeInfo.name,
                scene: opts.scene,
                camera: opts.camera,
                outputs: outputs
            });
        }
        else if (type === 'texture') {
            node = new CompoTextureNode({
                name: nodeInfo.name,
                outputs: outputs
            });
        }
        // Default is filter
        else {
            node = new CompoFilterNode({
                name: nodeInfo.name,
                shader: shaderSource,
                inputs: inputs,
                outputs: outputs
            });
        }
        if (node) {
            if (nodeInfo.parameters) {
                for (var name in nodeInfo.parameters) {
                    var val = nodeInfo.parameters[name];
                    if (typeof(val) === 'string') {
                        val = val.trim();
                        if (val.charAt(0) === '#') {
                            val = lib.textures[val.substr(1)];
                        }
                        else {
                            node.on(
                                'beforerender', createSizeSetHandler(
                                    name, tryConvertExpr(val)
                                )
                            );
                        }
                    }
                    node.setParameter(name, val);
                }
            }
            if (nodeInfo.defines && node.pass) {
                for (var name in nodeInfo.defines) {
                    var val = nodeInfo.defines[name];
                    node.pass.material.define('fragment', name, val);
                }
            }
        }
        return node;
    }

    function convertParameter(paramInfo) {
        var param = {};
        if (!paramInfo) {
            return param;
        }
        ['type', 'minFilter', 'magFilter', 'wrapS', 'wrapT', 'flipY', 'useMipmap']
            .forEach(function(name) {
                var val = paramInfo[name];
                if (val != null) {
                    // Convert string to enum
                    if (typeof val === 'string') {
                        val = Texture[val];
                    }
                    param[name] = val;
                }
            });
        ['width', 'height']
            .forEach(function(name) {
                if (paramInfo[name] != null) {
                    var val = paramInfo[name];
                    if (typeof val === 'string') {
                        val = val.trim();
                        param[name] = createSizeParser(
                            name, tryConvertExpr(val)
                        );
                    }
                    else {
                        param[name] = val;
                    }
                }
            });
        if (paramInfo.useMipmap != null) {
            param.useMipmap = paramInfo.useMipmap;
        }
        return param;
    }

    function loadTextures(json, lib, opts, callback) {
        if (!json.textures) {
            callback({});
            return;
        }
        var textures = {};
        var loading = 0;

        var cbd = false;
        var textureRootPath = opts.textureRootPath;
        util.each(json.textures, function(textureInfo, name) {
            var texture;
            var path = textureInfo.path;
            var parameters = convertParameter(textureInfo.parameters);
            if (Array.isArray(path) && path.length === 6) {
                if (textureRootPath) {
                    path = path.map(function(item) {
                        return util.relative2absolute(item, textureRootPath);
                    });
                }
                texture = new TextureCube(parameters);
            }
            else if(typeof path === 'string') {
                if (textureRootPath) {
                    path = util.relative2absolute(path, textureRootPath);
                }
                texture = new Texture2D(parameters);
            }
            else {
                return;
            }

            texture.load(path);
            loading++;
            texture.once('success', function() {
                textures[name] = texture;
                loading--;
                if (loading === 0) {
                    callback(textures);
                    cbd = true;
                }
            });
        });

        if (loading === 0 && !cbd) {
            callback(textures);
        }
    }

    function createSizeSetHandler(name, exprFunc) {
        return function (renderer) {
            // PENDING viewport size or window size
            var dpr = renderer.getDevicePixelRatio();
            // PENDING If multiply dpr ?
            var width = renderer.getWidth();
            var height = renderer.getHeight();
            var result = exprFunc(width, height, dpr);
            this.setParameter(name, result);
        };
    }

    function createSizeParser(name, exprFunc) {
        return function (renderer) {
            var dpr = renderer.getDevicePixelRatio();
            var width = renderer.getWidth();
            var height = renderer.getHeight();
            return exprFunc(width, height, dpr);
        };
    }

    function tryConvertExpr(string) {
        // PENDING
        var exprRes = /^expr\((.*)\)$/.exec(string);
        if (exprRes) {
            try {
                var func = new Function('width', 'height', 'dpr', 'return ' + exprRes[1]);
                // Try run t
                func(1, 1);

                return func;
            }
            catch (e) {
                throw new Error('Invalid expression.');
            }
        }
    }

    export default createCompositor;