Function layerIndexResolver

docs/app/js/sanddance-app.js:81643–81666

()

    return LayersPass1;
}((0, _passDefault.default));
function layerIndexResolver() {
    var startIndex = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
    var layerIndices = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    var resolvers = {};
    var resolveLayerIndex1 = function resolveLayerIndex(layer, isDrawn) {
        var indexOverride = layer.props._offset;
        var layerId = layer.id;
        var parentId = layer.parent && layer.parent.id;
        var index;
        if (parentId && !(parentId in layerIndices)) resolveLayerIndex(layer.parent, false);
        if (parentId in resolvers) {
            var resolver = resolvers[parentId] = resolvers[parentId] || layerIndexResolver(layerIndices[parentId], layerIndices);
            index = resolver(layer, isDrawn);
            resolvers[layerId] = resolver;
        } else if (Number.isFinite(indexOverride)) {
            index = indexOverride + (layerIndices[parentId] || 0);
            resolvers[layerId] = null;
        } else index = startIndex;
        if (isDrawn && index >= startIndex) startIndex = index + 1;
        layerIndices[layerId] = index;
        return index;
    };
    return resolveLayerIndex1;
}
function getGLViewport(gl, _ref3) {
    var viewport = _ref3.viewport;
    var height = gl.canvas ? gl.canvas.clientHeight || gl.canvas.height : 100;