ascension: src/scene.c@1d001eb694dc

     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/tree.h>

    33 #include <assert.h>

    35 #define asc_scene_node_layout \

    36     offsetof(AscSceneNode, parent), offsetof(AscSceneNode, children), \

    37     offsetof(AscSceneNode, prev), offsetof(AscSceneNode, next)

    39 void asc_scene_init(AscScene *scene) {

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

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

    42         return;

    43     }

    44     scene->root = asc_scene_node_empty();

    45 }

    47 void asc_scene_destroy(AscScene *scene) {

    48     asc_scene_node_free(scene->root);

    49 }

    51 void asc_scene_add(AscScene *scene, AscSceneNode *node) {

    52     asc_scene_node_link(scene->root, node);

    53 }

    55 static void asc_scene_draw_node(AscSceneNode *node) {

    56     if (node->draw_func != NULL) {

    57         node->draw_func(node);

    58     }

    59     if (node->children != NULL) {

    60         asc_scene_draw_node(node->children);

    61     }

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

    63         asc_scene_draw_node(node->next);

    64     }

    65 }

    67 void asc_scene_draw(AscScene const *scene) {

    68     // TODO: replace with UCX tree visitor

    69     // TODO: don't visit the tree, visit the render groups

    70     // TODO: avoid recursion

    71     asc_scene_draw_node(scene->root);

    72 }

    74 AscSceneNode *asc_scene_node_empty(void) {

    75     // TODO: check if this can remain a calloc or if it's too expensive

    76     AscSceneNode *node = calloc(1, sizeof(AscSceneNode));

    77     assert(node != NULL);

    78     node->free_func = (asc_scene_free_func) free;

    79     return node;

    80 }

    82 void asc_scene_node_free(AscSceneNode *node) {

    83     if (node == NULL) return;

    85     // TODO: replace with UCX tree visitor

    86     // TODO: avoid recursion

    88     // free the children recursively

    89     while (node->children != NULL) {

    90         asc_scene_node_free(node->children);

    91     }

    93     // remove this node from its parent

    94     asc_scene_node_unlink(node);

    96     // free the node

    97     if (node->free_func != NULL) {

    98         node->free_func(node);

    99     }

   100 }

   102 void asc_scene_node_link(AscSceneNode * restrict parent, AscSceneNode * restrict node) {

   103     cx_tree_link(parent, node, asc_scene_node_layout);

   104 }

   106 void asc_scene_node_unlink(AscSceneNode *node) {

   107     cx_tree_unlink(node, asc_scene_node_layout);

   108 }

Mercurial > hg > ascension / file revision