src/scene.c

Wed, 06 Mar 2024 23:38:17 +0100

author
Mike Becker <universe@uap-core.de>
date
Wed, 06 Mar 2024 23:38:17 +0100
changeset 36
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parent 33
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child 37
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permissions
-rw-r--r--

invert the logic of converting between specialized nodes and the generic interface

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 * Copyright 2023 Mike Becker. All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions are met:
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7 *
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 *
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11 * 2. Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 #include "ascension/scene.h"
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29 #include "ascension/error.h"
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30
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31 #include <cx/tree.h>
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32
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33 #include <assert.h>
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34
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35 #define child_list_off_ \
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36 offsetof(AscSceneNode, children), offsetof(AscSceneNode, next)
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37
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38 void asc_scene_init(AscScene *scene) {
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39 if (scene->root != NULL) {
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40 asc_error("Scene is already initialized.");
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41 return;
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42 }
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43 scene->root = asc_scene_node_empty();
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44 }
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45
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46 void asc_scene_destroy(AscScene *scene) {
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47 asc_scene_node_free(scene->root);
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48 }
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49
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50 void asc_scene_add(AscScene *scene, AscSceneNode *node) {
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51 asc_scene_node_link(scene->root, node);
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52 asc_node_update(node);
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53 }
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54
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55 void asc_scene_draw(AscScene const *scene) {
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56 CxTreeIterator iter = cx_tree_iterator(scene->root, false, child_list_off_);
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57
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58 // skip the root node deliberately, we know it's just the container
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59 cxIteratorNext(iter);
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60
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61 // update the children
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62 cx_foreach(AscSceneNode*, node, iter) {
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63 // execute behaviors, first
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64 AscBehaviorNode *behavior = node->behaviors;
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65 while (behavior) {
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66 behavior->func(node);
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67 behavior = behavior->next;
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68 }
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69
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70 // check if geometry needs update
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71 if (node->need_update && node->update_func != NULL) {
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72 node->need_update = false;
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73 asc_transform_copy(node->transform, node->parent->transform);
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74 node->update_func(node);
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75 }
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76
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77 // TODO: don't visit the tree for drawing, visit the render groups
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78 if (node->draw_func != NULL) {
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79 node->draw_func(node);
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80 }
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81 }
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82 }
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83
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84 AscSceneNode *asc_scene_node_empty(void) {
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85 AscSceneNode *node = calloc(1, sizeof(AscSceneNode));
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86 assert(node != NULL);
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87 node->free_func = (asc_scene_free_func) free;
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88 asc_transform_identity(node->transform);
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89 return node;
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90 }
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91
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92 void asc_scene_node_free(AscSceneNode *node) {
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93 if (node == NULL) return;
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94
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95 // remove this node from its parent
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96 asc_scene_node_unlink(node);
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97
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98 // free the entire subtree
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99 CxTreeIterator iter = cx_tree_iterator(node, true, child_list_off_);
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100 cx_foreach(AscSceneNode*, child, iter) {
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101 if (!iter.exiting) continue;
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102 if (child->free_func != NULL) {
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103 child->free_func(child);
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104 } else {
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105 free(child);
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106 }
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107 }
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108 }
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109
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110 void asc_scene_node_link(AscSceneNode * restrict parent, AscSceneNode * restrict node) {
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111 cx_tree_link(
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112 parent, node,
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113 offsetof(AscSceneNode, parent),
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114 offsetof(AscSceneNode, children),
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115 offsetof(AscSceneNode, prev),
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116 offsetof(AscSceneNode, next)
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117 );
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118 }
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119
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120 void asc_scene_node_unlink(AscSceneNode *node) {
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121 cx_tree_unlink(
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122 node,
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123 offsetof(AscSceneNode, parent),
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124 offsetof(AscSceneNode, children),
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125 offsetof(AscSceneNode, prev),
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126 offsetof(AscSceneNode, next)
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127 );
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128 }
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129
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130 AscBehaviorNode *asc_scene_add_behavior(AscSceneNode *node, asc_scene_update_func behavior) {
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131 AscBehaviorNode *behavior_node = calloc(1, sizeof(AscBehaviorNode));
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132 behavior_node->func = behavior;
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133 cx_tree_link(
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134 node,
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135 behavior_node,
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136 offsetof(AscBehaviorNode, parent),
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137 offsetof(AscSceneNode, behaviors),
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138 offsetof(AscBehaviorNode, prev),
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139 offsetof(AscBehaviorNode, next)
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140 );
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141 return behavior_node;
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142 }
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143
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144 void asc_scene_remove_behavior(AscBehaviorNode *node) {
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145 cx_tree_unlink(
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146 node,
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147 offsetof(AscBehaviorNode, parent),
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148 offsetof(AscSceneNode, behaviors),
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149 offsetof(AscBehaviorNode, prev),
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150 offsetof(AscBehaviorNode, next)
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151 );
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152 }

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