ascension: src/scene.c@601b3f4e17a2

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  * Copyright 2023 Mike Becker. All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions are met:

     7  *

     8  *   1. Redistributions of source code must retain the above copyright

     9  *      notice, this list of conditions and the following disclaimer.

    10  *

    11  *   2. Redistributions in binary form must reproduce the above copyright

    12  *      notice, this list of conditions and the following disclaimer in the

    13  *      documentation and/or other materials provided with the distribution.

    14  *

    15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    18  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    19  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    20  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    21  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    25  * POSSIBILITY OF SUCH DAMAGE.

    26  */

    28 #include "ascension/scene.h"

    29 #include "ascension/error.h"

    31 #include <cx/linked_list.h>

    32 #include <assert.h>

    34 void asc_scene_init(AscScene *scene) {

    35     if (scene->root != NULL) {

    36         asc_error("Scene is already initialized.");

    37         return;

    38     }

    39     scene->root = asc_scene_node_create(NULL);

    40 }

    42 void asc_scene_destroy(AscScene *scene) {

    43     asc_scene_node_free(scene->root);

    44 }

    46 AscSceneNode *asc_scene_node_create(AscSceneNode *parent) {

    47     AscSceneNode *node = malloc(sizeof(AscSceneNode));

    48     assert(node != NULL);

    49     node->children = cxLinkedListCreateSimple(CX_STORE_POINTERS);

    50     assert(node->children != NULL);

    51     node->parent = NULL;

    52     asc_scene_node_link(node, parent);

    53     return node;

    54 }

    56 void asc_scene_node_free(AscSceneNode *node) {

    57     if (node == NULL) return;

    58     while (cxListSize(node->children) > 0) {

    59         AscSceneNode *child = cxListAt(node->children, 0);

    60         asc_scene_node_free(child);

    61     }

    62     if (node->parent != NULL) {

    63         cxListFindRemove(node->parent->children, node);

    64     }

    65     free(node);

    66 }

    68 void asc_scene_node_link(

    69         AscSceneNode *node,

    70         AscSceneNode *parent

    71 ) {

    72     if (node->parent == parent) return;

    73     if (node->parent != NULL || parent == NULL) asc_scene_node_unlink(node);

    74     if (parent != NULL) {

    75         cxListAdd(parent->children, node);

    76         node->parent = parent;

    77     }

    78 }

    80 void asc_scene_node_unlink(AscSceneNode *node) {

    81     if (node->parent == NULL) return;

    82     cxListFindRemove(node->parent->children, node);

    83     node->parent = NULL;

    84 }

Mercurial > hg > ascension / file revision