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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 | #ifndef ASCENSION_SCENE_H |
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29 | #define ASCENSION_SCENE_H |
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30 | |
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31 | #include "datatypes.h" |
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32 | #include "transform.h" |
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33 | #include "camera.h" |
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34 | #include "texture.h" |
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35 | |
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36 | #include <cx/list.h> |
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37 | #include <cx/tree.h> |
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38 | |
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39 | typedef struct AscSceneNode AscSceneNode; |
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40 | |
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41 | typedef void(*asc_scene_free_func)(AscSceneNode*); |
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42 | typedef void(*asc_scene_update_func)(AscSceneNode*); |
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43 | |
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44 | enum AscRenderGroup { |
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45 | ASC_RENDER_GROUP_SPRITE_OPAQUE, |
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46 | ASC_RENDER_GROUP_SPRITE_BLEND, |
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47 | ASC_RENDER_GROUP_COUNT |
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48 | }; |
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49 | |
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50 | typedef CxTree* AscScene; |
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51 | |
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52 | struct AscSceneNode { |
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53 | struct cx_tree_node_base_s base; |
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54 | AscScene scene; |
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55 | CxList *behaviors; |
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56 | asc_scene_free_func free_func; |
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57 | asc_scene_update_func update_func; |
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58 | unsigned depth; // TODO: do we really need this bullshit? |
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59 | asc_vec3f position; |
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60 | asc_vec3f rotation; |
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61 | asc_vec3f scale; |
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62 | asc_transform transform; |
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63 | asc_transform world_transform; |
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64 | enum AscRenderGroup render_group; |
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65 | /** |
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66 | * Custom flags for this node. |
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67 | * The #ASC_SCENE_NODE_FLAGS_MASK bits are reserved for general flags. |
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68 | */ |
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69 | uint32_t flags; |
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70 | }; |
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71 | |
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72 | // TODO: move to sprite.h |
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73 | typedef struct AscSprite { |
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74 | AscSceneNode data; |
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75 | AscTexture tex; |
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76 | } AscSprite; |
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77 | |
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78 | /** |
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79 | * The reserved bits for general flags. |
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80 | */ |
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81 | #define ASC_SCENE_NODE_FLAGS_MASK 0xFF000000 |
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82 | /** |
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83 | * Set when a graphics update is needed in this frame. |
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84 | */ |
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85 | #define ASC_SCENE_NODE_UPDATE_GRAPHICS 0x01000000 |
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86 | /** |
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87 | * Set when a graphics updated happened last frame. |
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88 | */ |
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89 | #define ASC_SCENE_NODE_GRAPHICS_UPDATED 0x10000000 |
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90 | /** |
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91 | * Set when a transform update is needed in this frame. |
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92 | */ |
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93 | #define ASC_SCENE_NODE_UPDATE_TRANSFORM 0x02000000 |
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94 | /** |
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95 | * Set when a transform update happened last frame. |
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96 | */ |
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97 | #define ASC_SCENE_NODE_TRANSFORM_UPDATED 0x20000000 |
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98 | /** |
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99 | * Set when the node is not supposed to be shown on screen. |
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100 | */ |
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101 | #define ASC_SCENE_NODE_HIDDEN 0x80000000 |
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102 | |
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103 | /** |
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104 | * Draws the specified scene. |
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105 | * |
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106 | * @param scene the scene graph |
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107 | * @param viewport the window viewport the scene shall be drawn to |
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108 | * @param camera the camera to obtain the view and projection matrix from |
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109 | */ |
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110 | __attribute__((__nonnull__)) |
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111 | void asc_scene_draw(AscScene scene, asc_recti viewport, AscCamera *camera); |
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112 | |
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113 | AscScene asc_scene_create(void); |
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114 | void asc_scene_destroy(AscScene scene); |
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115 | |
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116 | /** |
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117 | * Creates an empty node that may serve as a container for other nodes. |
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118 | * |
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119 | * @return the new node |
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120 | */ |
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121 | AscSceneNode *asc_scene_node_empty(void); |
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122 | |
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123 | /** |
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124 | * Adds a node to a (new) parent. |
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125 | * |
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126 | * @param parent the (new) parent |
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127 | * @param node the node to add |
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128 | */ |
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129 | __attribute__((__nonnull__)) |
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130 | void asc_scene_node_add( |
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131 | AscSceneNode *restrict parent, |
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132 | AscSceneNode *restrict node |
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133 | ); |
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134 | |
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135 | /** |
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136 | * Removes a node from its scene. |
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137 | * |
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138 | * This might be useful to temporarily remove a subtree from a scene. |
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139 | * |
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140 | * @param node the node to remove from its scene |
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141 | */ |
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142 | __attribute__((__nonnull__)) |
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143 | void asc_scene_node_remove(AscSceneNode *node); |
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144 | |
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145 | /** |
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146 | * Retrieves the parent of a particular node. |
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147 | * |
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148 | * @param node the node |
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149 | * @return the parent of \p node (or NULL when it is the root node) |
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150 | */ |
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151 | __attribute__((__nonnull__)) |
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152 | static inline AscSceneNode *asc_scene_node_parent(AscSceneNode *node) { |
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153 | return (AscSceneNode *) node->base.parent; |
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154 | } |
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155 | |
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156 | /** |
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157 | * Adds a behavior function to the node. |
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158 | * |
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159 | * A behavior function MUST NOT be added more than once to the same node. |
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160 | * This will not be checked. |
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161 | * |
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162 | * @param node the node |
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163 | * @param behavior the behavior function |
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164 | */ |
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165 | __attribute__((__nonnull__)) |
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166 | void asc_scene_add_behavior( |
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167 | AscSceneNode *node, |
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168 | asc_scene_update_func behavior |
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169 | ); |
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170 | |
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171 | /** |
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172 | * Removes a behavior function from the node. |
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173 | * |
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174 | * If the behavior function is not attached to this node, this function |
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175 | * does nothing. |
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176 | * |
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177 | * @param node the node |
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178 | * @param behavior the behavior function |
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179 | */ |
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180 | __attribute__((__nonnull__)) |
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181 | void asc_scene_remove_behavior( |
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182 | AscSceneNode *node, |
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183 | asc_scene_update_func behavior |
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184 | ); |
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185 | |
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186 | __attribute__((__nonnull__)) |
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187 | void asc_node_update(AscSceneNode *node); |
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188 | |
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189 | __attribute__((__nonnull__)) |
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190 | void asc_node_update_transform(AscSceneNode *node); |
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191 | |
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192 | |
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193 | __attribute__((__nonnull__)) static inline |
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194 | void asc_set_position(AscSceneNode *node, float x, float y, float z) { |
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195 | node->position.x = x; |
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196 | node->position.y = y; |
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197 | node->position.z = z; |
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198 | asc_node_update_transform(node); |
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199 | } |
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200 | |
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201 | __attribute__((__nonnull__)) static inline |
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202 | void asc_set_position2d(AscSceneNode *node, int x, int y) { |
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203 | node->position.x = (float)x; |
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204 | node->position.y = (float)y; |
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205 | node->position.z = 0.f; |
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206 | asc_node_update_transform(node); |
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207 | } |
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208 | |
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209 | __attribute__((__nonnull__)) static inline |
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210 | asc_vec2i asc_get_position2d(AscSceneNode *node) { |
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211 | return (asc_vec2i) {(int) node->position.x, (int) node->position.y}; |
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212 | } |
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213 | |
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214 | __attribute__((__nonnull__)) static inline |
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215 | void asc_set_scale(AscSceneNode *node, float width, float height, float depth) { |
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216 | node->scale.width = width; |
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217 | node->scale.height = height; |
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218 | node->scale.depth = depth; |
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219 | asc_node_update_transform(node); |
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220 | } |
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221 | |
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222 | __attribute__((__nonnull__)) static inline |
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223 | void asc_set_scale2d(AscSceneNode *node, int width, int height) { |
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224 | node->scale.width = (float)width; |
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225 | node->scale.height = (float)height; |
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226 | node->scale.depth = 1.f; |
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227 | asc_node_update_transform(node); |
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228 | } |
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229 | |
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230 | __attribute__((__nonnull__)) static inline |
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231 | asc_vec2i asc_get_scale2d(AscSceneNode *node) { |
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232 | return (asc_vec2i) {(int) node->scale.width, (int) node->scale.height}; |
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233 | } |
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234 | |
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235 | #endif // ASCENSION_SCENE_H |
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236 |