ascension: src/scene.c@86468a71dd73

     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 node_layout_ \

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

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

    38 #define child_list_off_ \

    39     offsetof(AscSceneNode, children), offsetof(AscSceneNode, next)

    41 void asc_scene_init(AscScene *scene) {

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

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

    44         return;

    45     }

    46     scene->root = asc_scene_node_empty();

    47 }

    49 void asc_scene_destroy(AscScene *scene) {

    50     asc_scene_node_free(scene->root);

    51 }

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

    54     asc_scene_node_link(scene->root, node);

    55     asc_node_update(node);

    56 }

    58 void asc_scene_draw(AscScene const *scene) {

    59     CxTreeIterator iter = cx_tree_iterator(scene->root, false, child_list_off_);

    61     // skip the root node deliberately, we know it's just the container

    62     cxIteratorNext(iter);

    64     // draw the children

    65     cx_foreach(AscSceneNode*, node, iter) {

    66         if (node->need_update && node->update_func != NULL) {

    67             node->need_update = false;

    68             asc_transform_copy(node->transform, node->parent->transform);

    69             node->update_func(node);

    70         }

    71         // TODO: don't visit the tree for drawing, visit the render groups

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

    73             node->draw_func(node);

    74         }

    75     }

    76 }

    78 AscSceneNode *asc_scene_node_empty(void) {

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

    80     assert(node != NULL);

    81     node->free_func = (asc_scene_free_func) free;

    82     asc_transform_identity(node->transform);

    83     return node;

    84 }

    86 void asc_scene_node_free(AscSceneNode *node) {

    87     if (node == NULL) return;

    89     // remove this node from its parent

    90     asc_scene_node_unlink(node);

    92     // free the entire subtree

    93     CxTreeIterator iter = cx_tree_iterator(node, true, child_list_off_);

    94     cx_foreach(AscSceneNode*, child, iter) {

    95         if (!iter.exiting) continue;

    96         if (child->free_func != NULL) {

    97             child->free_func(child);

    98         } else {

    99             free(child);

   100         }

   101     }

   102 }

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

   105     cx_tree_link(parent, node, node_layout_);

   106 }

   108 void asc_scene_node_unlink(AscSceneNode *node) {

   109     cx_tree_unlink(node, node_layout_);

   110 }

Mercurial > hg > ascension / file revision