1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/scene.c Mon Dec 18 19:04:44 2023 +0100
1.3 @@ -0,0 +1,84 @@
1.4 +/*
1.5 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
1.6 + * Copyright 2023 Mike Becker. All rights reserved.
1.7 + *
1.8 + * Redistribution and use in source and binary forms, with or without
1.9 + * modification, are permitted provided that the following conditions are met:
1.10 + *
1.11 + * 1. Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + *
1.14 + * 2. Redistributions in binary form must reproduce the above copyright
1.15 + * notice, this list of conditions and the following disclaimer in the
1.16 + * documentation and/or other materials provided with the distribution.
1.17 + *
1.18 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
1.22 + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 + * POSSIBILITY OF SUCH DAMAGE.
1.29 + */
1.30 +
1.31 +#include "ascension/scene.h"
1.32 +#include "ascension/error.h"
1.33 +
1.34 +#include <cx/linked_list.h>
1.35 +#include <assert.h>
1.36 +
1.37 +void asc_scene_init(AscScene *scene) {
1.38 + if (scene->root != NULL) {
1.39 + asc_error("Scene is already initialized.");
1.40 + return;
1.41 + }
1.42 + scene->root = asc_scene_node_create(NULL);
1.43 +}
1.44 +
1.45 +void asc_scene_destroy(AscScene *scene) {
1.46 + asc_scene_node_free(scene->root);
1.47 +}
1.48 +
1.49 +AscSceneNode *asc_scene_node_create(AscSceneNode *parent) {
1.50 + AscSceneNode *node = malloc(sizeof(AscSceneNode));
1.51 + assert(node != NULL);
1.52 + node->children = cxLinkedListCreateSimple(CX_STORE_POINTERS);
1.53 + assert(node->children != NULL);
1.54 + node->parent = NULL;
1.55 + asc_scene_node_link(node, parent);
1.56 + return node;
1.57 +}
1.58 +
1.59 +void asc_scene_node_free(AscSceneNode *node) {
1.60 + if (node == NULL) return;
1.61 + while (cxListSize(node->children) > 0) {
1.62 + AscSceneNode *child = cxListAt(node->children, 0);
1.63 + asc_scene_node_free(child);
1.64 + }
1.65 + if (node->parent != NULL) {
1.66 + cxListFindRemove(node->parent->children, node);
1.67 + }
1.68 + free(node);
1.69 +}
1.70 +
1.71 +void asc_scene_node_link(
1.72 + AscSceneNode *node,
1.73 + AscSceneNode *parent
1.74 +) {
1.75 + if (node->parent == parent) return;
1.76 + if (node->parent != NULL || parent == NULL) asc_scene_node_unlink(node);
1.77 + if (parent != NULL) {
1.78 + cxListAdd(parent->children, node);
1.79 + node->parent = parent;
1.80 + }
1.81 +}
1.82 +
1.83 +void asc_scene_node_unlink(AscSceneNode *node) {
1.84 + if (node->parent == NULL) return;
1.85 + cxListFindRemove(node->parent->children, node);
1.86 + node->parent = NULL;
1.87 +}
1.88 \ No newline at end of file
